263 results on '"Die cutting"'
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2. String-Like Fiber Dust Occurrence in Crush Cutting of Stacked Liner Boards
- Author
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Nagasawa, Shigeru, Oyake, Takuya, Kajizuka, Takashi, Muruganant, M., editor, Chirazi, Ali, editor, and Raj, Baldev, editor
- Published
- 2018
- Full Text
- View/download PDF
3. A Novel Modified Shaving Die Design for Fabrication with Nearly Zero Die Roll Formations.
- Author
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Thipprakmas, Sutasn and Sontamino, Arkarapon
- Abstract
In recent years, increasing levels of precision of the cut surface characteristics in the cutting process of a metal die have become required not only for crack prevention but also for die roll prevention. The conventional shaving die is unlikely to be applied to achieve these requirements. As an innovative design, a novel modified shaving die with two steps of tapering, press and cut tapers, was designed and proposed in this research. The finite element method (FEM) was used to clarify the cutting mechanism and identify the effects of the process parameters and geometry of the shaving die of interest on the cut surface characteristics based on material flow and stress distribution analyses. The press taper limits the die roll formation on the sheared edge during the first stage of the cutting phase, and the cut taper prevents a new die roll from forming during the second stage of the cutting phase. The results showed that by using the novel modified shaving die, die roll formation could be reduced. Furthermore, by suitably selecting the process parameters and geometry of the shaving die, nearly zero die roll (nZDR) could be achieved. Laboratory experiments were carried out to validate the FEM simulation results. The FEM simulation results showed good agreement with the experimental results in terms of the cut surface characteristics and the cutting forces. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
4. Evaluation of the Separation Process for the Production of Electrode Sheets.
- Author
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Jansen, Tobias, Kandula, Maja W., Blass, David, Hartwig, Sven, Haselrieder, Wolfgang, and Dilger, Klaus
- Subjects
MANUFACTURING processes ,LASER beam cutting ,ELECTRIC batteries ,ELECTROCHEMICAL cutting ,ELECTRODES ,ELECTROCHEMICAL apparatus - Abstract
The recent development of individual mobility is characterized by a resource‐saving and environmentally friendly technology policy. Electromobility has the greatest potential to meet these demands. Due to the high volumetric power density at both the cell as well as the battery levels, pouch cells are addressed as a target cell format. As a separation of the electrodes is absolutely necessary for this cell design, the separation of the electrodes constitutes a basic operation of the pouch cell production. The established separation methods, such as die and laser cutting, are compared in this work with regard to their physical cutting‐edge quality. For reproducible evaluation, the occurring cutting‐edge characteristics are defined to clearly describe the quality of the separated electrode. Furthermore, the influence of the photonically and mechanically produced cutting edge on the electrochemical performance is presented. The results show that the delamination of the active materials and the bending of the collector and the metal spatter have the greatest influence on the electrochemical performance of the cell. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
5. Structure Design of Die Cutting Unit in Corrugated Carton Production Line
- Author
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Ge, Rongyu, Wu, Yimin, Wang, Haitao, Ouyang, Yun, editor, Xu, Min, editor, Yang, Li, editor, and Ouyang, Yujie, editor
- Published
- 2016
- Full Text
- View/download PDF
6. Effect of machining conditions on the trimming damage in composite laminates induced by out-of-plane shearing.
- Author
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Yashiro, Shigeki, Ono, Ryuji, and Ogi, Keiji
- Subjects
- *
LAMINATED materials , *DELAMINATION of composite materials , *COMPOSITE structures , *GLASS transition temperature , *POLYMERIC composites , *MASS production - Abstract
Fast machining is essential for mass production of composite structures, and out-of-plane shearing, also known as die cutting, is appropriate for trimming. Nevertheless, little is known about shearing of polymer-matrix composites. This study was done to investigate the damaging impact of shearing conditions on carbon fiber reinforced plastic (CFRP) laminates. The clearance and temperature affected the damage progress, while the cutting speed in the tested range had negligible effect. In cross-ply laminates, delamination and matrix cracks first appeared in a narrow shearing zone, and with further loading longitudinal plies broke at the dies' edges. Although delamination occurred only in a narrow shear-stress concentrated zone in the case of a small clearance, it was significant for a large clearance, owing to the local bending deformation. A temperature slightly lower than the glass transition temperature narrowed the delamination area, owing to the increase in the interlaminar fracture toughness as well as insignificant strength degradation of the matrix. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
7. Lateral Forces in Rolling-Cut Shearing and Their Consequences on Common Edge Defects.
- Author
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Zeiler, Alexander, Steinboeck, Andreas, Kugi, Andreas, and Jochum, Martin
- Subjects
- *
SCIENCE periodicals , *LATERAL loads , *IRON & steel plates , *TRAJECTORIES (Mechanics) - Abstract
This paper deals with the detailed analysis of the lateral process forces in rolling-cut shearing of heavy steel plates and their impact on edge defects. Rolling-cut shearing is still the most common method of heavy-plate side trimming. However, this method can entail edge defects like uneven longitudinal shape as well as burr and fractures in the area of the cut-changeover (beginning and end of the periodical cuts). In the existing literature, neither the root cause of these edge defects nor their nexus with the upper blade trajectory (blade drive-kinematics) has been analyzed in detail. In this work, these issues will be explored based on the finite element method (FEM) simulations and measurements from an industrial plant. The complex interrelation between drive-kinematics, varying lateral force, unintended lateral motion of the upper blade, unintended variation of the blade clearance, and quality defects is analyzed. The variation of the lateral force is identified as the root cause of such quality defects and a physical explanation for variations of the lateral force is given. The detailed understanding of the shearing process serves as a solid basis for an optimization and re-design of the drive-kinematics in a future work. Measurements from an industrial plant and simulation results show good agreement and thus confirm the theory. The results are transferable to other rolling-cut trimming shears. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
8. Die Cutting
- Author
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Chatti, Sami, editor, Laperrière, Luc, editor, Reinhart, Gunther, editor, and Tolio, Tullio, editor
- Published
- 2019
- Full Text
- View/download PDF
9. Controlling the Folding of the Blank in Paperboard Tray Press Forming
- Author
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Panu Tanninen, Ville Leminen, Harri Eskelinen, Henry Lindell, and Juha Varis
- Subjects
Press forming ,Creasing ,Paperboard ,Die cutting ,Folding ,Biotechnology ,TP248.13-248.65 - Abstract
The press forming process of paperboard trays is challenging. The production of trays that fulfill all functional and visual property requirements is demanding. Blank preparation is an essential part of paperboard tray press forming. The aim of this work was to study how a creasing pattern can be utilized in the compaction and folding of the substrate in tray corners. The investigation of creasing pattern designs focused on the positioning of creases, the optimization of the amount of creases, and the width of the creases. The results of the study show that the amount of creases in the tray corner is the most important variable in the pattern design. The substrate folds more evenly and the wall of the tray is smoother when the material has the optimum amount of folds for it to compact during the press forming process. Changes in the creasing pattern primarily affect the amount of unclosed creases in the flange of the tray, which can make tight lidding of the tray impossible. The outcome of the study is a morphological analysis of the introduced creasing pattern alternatives and a selection of formulas that can be utilized in the creasing pattern design process.
- Published
- 2015
- Full Text
- View/download PDF
10. A Simple Effective Stress Approach for Modeling Rate-Dependent Strength of Soft Clay.
- Author
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Jiang Tao Yi, Yu Ping Li, Yong Fu, Fook Hou Lee, and Xi Ying Zhang
- Subjects
- *
OCEAN engineering periodicals , *STRAINS & stresses (Mechanics) , *CLAY - Abstract
This paper proposes a simple effective stress method for modeling the strain rate-dependent strength behavior that is experienced by many fine-grained soils in offshore events when subjected to rapid, large strain, undrained shearing. The approach is based on correlating the size of the modified Cam-Clay yield locus with strain rate, i.e., yield locus enlarging or diminishing dependent on the strain rate. A viscometer-based method for evaluating the needed parameters for this approach is provided. The viscometer measurements showed that strain rate parameters are largely independent of water content and agree closely with data from a previous study. Numerical analysis of the annular simple shear situation induced by the viscometer shows remarkable agreement with the experimental data provided the remolding-induced strength degradation effect is accounted for. The proposed method allows offshore foundation installation processes such as dynamically installed offshore anchors, free-falling penetrometer, and submarine landslides to be more realistically analyzed through effective stress calculations. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
11. Parametric design applied to die cutting machine
- Author
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Sergio Humberto Delgado-Guerrero, Martín Eduardo Rodríguez-Franco, Ricardo Jara-Ruiz, and Jesús De La Cruz
- Subjects
Parametric design ,Die cutting ,Computer science ,Mechanical engineering ,General Medicine - Abstract
In this paper, the particularities of applying parameterization in industrial machines corresponding to the manufacturing area are exposed and analyzed. For its development, the parameterized design of a die cutting machine is proposed as an object of study, which is formulated from the main elements considered of importance in the principle of operation, being necessary to carry out a prior investigation to analyze it and how the parameterization process influences. Parameterization is a quality of the components to adapt flexibly to the needs of the industry or sector, facilitating the redesign and manufacturing process, allowing the desired dimensional update or adjustment to be carried out only to the central component and the others are automatically adapted. Attending to the current needs and trends of the fourth industrial revolution, as well as establishing the benefits of this type of flexible design processes to expand their implementation to different industrial machines such as robot configurations.
- Published
- 2021
- Full Text
- View/download PDF
12. Analysis of paperboard creasing properties with a novel device
- Author
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Panu Tanninen, Sami Matthews, Juha Varis, and Ville Leminen
- Subjects
Paperboard ,business.product_category ,Computer science ,Sample (material) ,Process (computing) ,Mechanical engineering ,Folding (DSP implementation) ,Industrial and Manufacturing Engineering ,Die cutting ,Artificial Intelligence ,Consistency (statistics) ,Spring (device) ,visual_art ,visual_art.visual_art_medium ,Die (manufacturing) ,business - Abstract
In the preparation of the die cutting process, basic adjustments can be made based on the appearance of the creases and emerging material damage. To achieve an accurate optimization, more elaborate analysis methods are needed. The object of the study was to develop a practical and accurate accessory device for a material tester that combines the advantages of laboratory measuring equipment as well as die cutting tools used in industrial applications. The operation of the developed device and the evaluation method were verified with a series of creasing tests with commercial sample materials. Special attention was paid to crease dimensions, level of spring back, folding resistance and forming force optimization. The changes in the crease material thickness increased as a function of forming depth as expected. The same consistency was not found in the comparison of the depth of the creases formed in different directions. Spring back of the material was deduced to be a significant factor for the final dimensions of creases. In addition, it was discovered the creases do not have to be die cut too fiercely, as the desired functionality can be achieved with less force. Obtained results were considered beneficial in the analysis of materials and in the control of the die cutting process.
- Published
- 2021
- Full Text
- View/download PDF
13. Comparison of creasing and scoring in the manufacturing of folding cartons
- Author
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Arvo Niini, Sami Matthews, Panu Tanninen, and Ville Leminen
- Subjects
Die cutting ,Compressive strength ,Materials science ,business.product_category ,Artificial Intelligence ,Mechanical engineering ,Folding (DSP implementation) ,business ,Industrial and Manufacturing Engineering ,Carton - Abstract
Creasing and scoring are methods used in the production of carton blanks in package manufacturing. The objective of this paper was to compare the creasing and scoring processes to investigate the effect on the performance in folding and in manufactured packages. A series of converting experiments and measurements were performed to investigate the differences between the processes. The results show differences between the creased and scored samples. The blanks die-cut with flatbed die cutting machine required the lowest folding force, while the packages manufactured with laser scoring had the highest compression strength. The results indicate that all methods are suitable to be used in the manufacturing of carton blanks.
- Published
- 2021
- Full Text
- View/download PDF
14. Drive of the die-cutting pressing plate with using the screw-nut transmission (analysis of kinetic power components)
- Author
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P. I. Behen, I. I. Rehei, I. A. Radihovskii, S. V. Ternytskii, and O. B. Knysh
- Subjects
Pressing ,Nut ,Die cutting ,Materials science ,Transmission (telecommunications) ,Mechanical engineering ,Kinetic energy ,Power (physics) - Published
- 2021
- Full Text
- View/download PDF
15. Calculation of the work resource of the drive mechanism of a pressure plate in a die-cutting flat press
- Author
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O. Yu. Cheterbukh
- Subjects
Mechanism (engineering) ,Die cutting ,Resource (project management) ,Work (electrical) ,Pressure plate ,Computer science ,Mechanical engineering - Published
- 2021
- Full Text
- View/download PDF
16. Grinding Energy Modeling Based on Friction, Plowing, and Shearing.
- Author
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Linke, Barbara S., Garretson, Ian, Torner, Francois, and Seewig, Joerg
- Subjects
- *
ENGINEERING periodicals , *GRINDING machines , *FRICTION , *SHEARING force - Abstract
Grinding is an important abrasive machining process at the end of many process chains. Understanding energy transformation in grinding is not only important to improve energy efficiency but also crucial for understanding the chip formation process itself. Grinding energy can be studied at the macroscopic or microscopic levels, wherein the entire grinding tool is considered or the phenomena at the single cutting edges are studied. This paper explores existing energy modeling approaches in grinding with particular emphasis on physical models. Models on energy transformation during the ductile grit-workpiece engagement for three regimes --being friction, plowing, and shearing --are explained. In addition to the critical depth of cut (DOC) when chip formation starts, a critical depth when plowing begins is introduced to divide between the different regimes. Selected models for each regime are combined to an integrated grinding energy model that allows researchers to investigate forces and energy during grit engagement. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
17. An Experimental Work on Tool Wear Affected by Die Clearance and Punch Hardness.
- Author
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Akyürek, Ferhat, Yaman, Kemal, and Tekiner, Zafer
- Subjects
- *
SHEET metal work , *CUTTING (Materials) , *MASS production , *BLANKING (Metalwork) , *ALUMINUM - Abstract
Die clearance is a widely known parameter affecting both tool life and edge quality of parts in blanking operations. Selecting the optimum punch-die clearance can give a longer tool life and better product quality by minimizing tool wear. In experimental studies, the effects of cutting die clearance and punch hardness on the punch edge and face wear were investigated. AISI D2 cold work steel with 50, 55 and 60 HRC-hardness punches was used as tool material. Three different cutting die clearances 3, 5 and 8% of sheet thickness were used. A modular punch-die set was prepared, and 2000, 4000, 6000 and 8000 samples are pressed. The results of the experiments showed that the punch edge and face wear decreased with increasing punch hardness and that smooth-sheared parts are strongly dependent on the clearance. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
18. Effect of Gas/Liquid Shearing on the Viscoelastic Instability of a Planar Sheet.
- Author
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Ming-Xi Tong, Li-Jun Yang, Qing-Fei Fu, and Chao-Jie Mo
- Subjects
GAS-liquid interfaces ,SHEARING force ,VISCOELASTICITY ,FLOW instability ,AERODYNAMICS - Abstract
The Kelvin-Helmholtz instability of viscoelastic flows was examined through a linear instability analysis. Due of the position change of viscoelastic effects, different unstable responses of liquid elastic effects and medium viscous effects were fully investigated. Finally, a comparison of gas/liquid shearing and inviscid aerodynamic effects on sheet instability is conducted. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
19. Shape formation after laser hardening for high-precision micro-cutting edge
- Author
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Hirotaka Tanabe, Heisaburo Nakagawa, Mitsuhiro Goto, and Keiji Ogawa
- Subjects
0209 industrial biotechnology ,Materials science ,02 engineering and technology ,Shape formation ,021001 nanoscience & nanotechnology ,Laser ,Industrial and Manufacturing Engineering ,Finite element method ,law.invention ,Die cutting ,020901 industrial engineering & automation ,Mechanics of Materials ,law ,Hardening (metallurgy) ,General Materials Science ,Composite material ,0210 nano-technology - Abstract
Micro-cutting edges are often used for the die cutting of functional films and paper containers. A hardening process is needed here because the ridgelines of micro-cutting edges require not only we...
- Published
- 2020
- Full Text
- View/download PDF
20. Digital twin design for real-time monitoring – a case study of die cutting machine
- Author
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Septianda Angelica, Kung-Jeng Wang, and Ying-Hao Lee
- Subjects
0209 industrial biotechnology ,021103 operations research ,Computer science ,Strategy and Management ,0211 other engineering and technologies ,Core (manufacturing) ,02 engineering and technology ,Management Science and Operations Research ,Industrial and Manufacturing Engineering ,Manufacturing engineering ,Die cutting ,020901 industrial engineering & automation ,Material handling ,Smart manufacturing - Abstract
Digital twin (DT) is a core technology that enables the integration among physical machines, tools, material handling and warehousing, and real-time manufacturing decisions. In this study, a DT fra...
- Published
- 2020
- Full Text
- View/download PDF
21. Modeling of the Air Consumption Process in a Camera of a Rotary Cut-Off Module
- Subjects
Materials science ,стрічковий транспортер ,686.12.056 ,Nozzle ,Airflow ,Mechanical engineering ,стиснуте повітря ,струмінь повітря ,Die cutting ,Density of air ,air stream ,повітряний потік ,conveyor belt ,air flow ,картонна розгортка ,cardboard ,cardboard blank ,аркушевий матеріал ,visual_art ,sheet material ,lcsh:NE1-3002 ,visual_art.visual_art_medium ,Working fluid ,Trimming ,Actuator ,lcsh:Print media ,compressed air - Abstract
Метою даного дослідження є попередній розрахунок і моделювання технологічних параметрів процесу висікання картонних розгорток у пневматичній системі засобами автоматизованого проектування SolidWorks. У даний час проектування, модернізація і удосконалення ротаційного обладнання вимагає оригінальних технічних рішень, особливо для виробництва різнопрофільних картонних паковань. Йдеться про якісний технологічний процес висікання в зоні «ніж—контрніж» і взагалі про виконання завершальних робіт. Проблема дослідження стосується ріжучих і обробних виконавчих механізмів. Відповідно використання пневматичних систем може істотно спростити процес висікання. Розроблений на кафедрі модуль для висікання може бути вбудованим у транспортувальну систему. Наприклад, у стрічковий конвеєр. Таке комбінування транспортера і ротаційного модуля для висікання картонних заготовок вимагає додаткових теоретичних і експериментальних досліджень. Equipment for the manufacture of cardboard products is constantly being improved. New sections for die cutting are being designed. As well as devices for carrying out technological processes of die-cutting and cutting down of cardboard products. The tendency to improve the rotational method of trimming and die cutting of sheet materials is increasing. The main problem in the design of die cutting equipment is the quality of the processes performed. The advantages of the rotary die cutting sections include high productivity. Therefore, improving this process is very important. This article deals with the technological process of cutting in the knife-counter—knife zone. The problem of the interaction of cutting actuators is considered. The use of pneumatic systems greatly simplifies the die cutting process. An advantage of the pneumatic die cutting module is that it can be integrated into the transport system. This combination of conveyor and rotary module allows for curved separation of cardboard sweep. The aim of this study is to simulate the technological parameters of the process of cutting cardboard reamers in a pneumatic system. The calculation was carried out by computer aided design. Accordingly, in the working area of die cutting of the pneumatic system, the air pressure changes. Therefore, temperature parameters of air are important parameters. As previous studies have shown, air temperature can affect the performance of the rotary die cutting module. With increasing temperature, the required air flow rate increases to maintain the required working pressure. This is directly related to a decrease in air density with increasing temperature. Improving the geometry of the nozzle of a pneumatic system is an important study. A partial drop in pressure in the working areas of the die cutting can lead to a decrease in the quality of material processing. The basis of the work is research on the influence of air flow and its temperature variables as a characteristic working fluid. Additional studies carried out using the SolidWorks computer-aided design system show the dependence of the air volumetric flow rate on its variable temperature in the working area of the pneumatic rotary die cutting section.
- Published
- 2020
- Full Text
- View/download PDF
22. Drive of the pressure plate of the die-cutting press on the basis of using the screw nut transmission (method of evaluation of consumption power components)
- Author
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P. I. Behen, I. A. Radikhovsky, O. B. Knysh, O. I. Mlynko, and I. I. Rehei
- Subjects
Consumption (economics) ,Nut ,Die cutting ,Materials science ,Pressure plate ,Basis (linear algebra) ,Transmission method ,Mechanical engineering ,Power (physics) - Published
- 2020
- Full Text
- View/download PDF
23. The drive mechanism of a pressure plate of a flat die-cutting press
- Author
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O. Yu. Cheterbukh, O. O. Palamar, V. V. Shyrokov, and J. A. Shakhbazov
- Subjects
Mechanism (engineering) ,Die cutting ,Materials science ,Pressure plate ,Composite material - Published
- 2020
- Full Text
- View/download PDF
24. Effect of machining conditions on the trimming damage in composite laminates induced by out-of-plane shearing
- Author
-
Yashiro, Shigeki, Ono, Ryuji, Ogi, Keiji, Yashiro, Shigeki, Ono, Ryuji, and Ogi, Keiji
- Abstract
Fast machining is essential for mass production of composite structures, and out-of-plane shearing, also known as die cutting, is appropriate for trimming. Nevertheless, little is known about shearing of polymer-matrix composites. This study was done to investigate the damaging impact of shearing conditions on carbon fiber reinforced plastic (CFRP) laminates. The clearance and temperature affected the damage progress, while the cutting speed in the tested range had negligible effect. In cross-ply laminates, delamination and matrix cracks first appeared in a narrow shearing zone, and with further loading longitudinal plies broke at the dies’ edges. Although delamination occurred only in a narrow shear-stress concentrated zone in the case of a small clearance, it was significant for a large clearance, owing to the local bending deformation. A temperature slightly lower than the glass transition temperature narrowed the delamination area, owing to the increase in the interlaminar fracture toughness as well as insignificant strength degradation of the matrix.
- Published
- 2021
25. Automation CAE Toolkit Method for Ram BOP Design
- Author
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Ke Li, Matthew D. Givens, Seth Berry, Wang Yaou, Haitao Zhang, Chris Nault, and Micah Threadgill
- Subjects
Engineering drawing ,Engineering ,Die cutting ,business.industry ,business ,Computer-aided engineering ,Automation - Abstract
A Blowout Preventer (BOP) serves as a safety valve in the drilling process in the oil and gas industry. It will be closed if an influx of formation fluids occurs and threatens the rig. A Ram BOP is one type of widely used BOP. It is composed of two ram blades, which will move towards each other to shear the drilling pipe and to close the valve. To ensure the shearing process be completed on the rig, lab tests are often run to evaluate the BOP’s capability and the required shearing pressure. The paper presents a new automation CAE (Computer-Aided Engineering) toolkit method recently developed to simulate the Ram BOP pipe shearing process. The toolkit method automates and integrates the process from computer aided design (CAD) to computer aided simulation for the Ram shearing process. It significantly simplifies the modeling effort and facilitates the design optimization process.
- Published
- 2021
- Full Text
- View/download PDF
26. Dynamic Performance Analysis of Interfacial Cracks Near an Eccentric Elliptical Hole in Piezoelectric Bi-Materials Under Incident Sh-Waves
- Author
-
Ming Zhao, Yu Liu, Ni An, Gangling Hou, and Tian-shu Song
- Subjects
Stress (mechanics) ,Die cutting ,Materials science ,Eccentric ,Shearing deformation ,Composite material ,Piezoelectricity - Abstract
Piezoelectric materials have been widely used in modern science and technology due to their electro-mechanical coupling response. Sometimes, because of the stiff and brittle nature of some piezoelectric materials, the piezoelectric devices with defects may face fracture or failure during their service procedures. Therefore, it has become important to investigate the failure behaviors caused by defects, such as cracks and holes. Based on the study of the dynamic anti-plane characteristics for radial crack emanating from a circular cavity in piezoelectric bi-materials, this paper aims to analyzes the dynamic incident anti-plane shearing (SH-wave) in piezoelectric bi-materials, which contains two interfacial cracks, near an eccentric elliptical hole. Green’s function method, the conformal mapping method, the interface conjunction techniques and the crack-deviation techniques are utilized to obtain a series of first kind Fredholm’s equations, based on which the dynamic stress intensity factor (DSIF) at the outer and the inner cracks’ tips are theoretically expressed. Numerical examples were graphically presented to illustrate the effects of the piezoelectric parameter, the effective piezoelectric elastic modulus, the dimensionless incident wave number and geometric parameters on the DSIF at both of the tips. Previous studies are not comprehensive, especially when the center of the hole deviates from the interface. Therefore, the impact of eccentric distance on DSIF is considered in this paper. The solution of this problem provides a more accurate and efficient method for the investigation of dynamic fracture properties of piezoelectric materials and has an important theoretical significance in engineering design.
- Published
- 2021
- Full Text
- View/download PDF
27. Effect of machining conditions on the trimming damage in composite laminates induced by out-of-plane shearing
- Author
-
Keiji Ogi, Shigeki Yashiro, and Ryuji Ono
- Subjects
0209 industrial biotechnology ,Materials science ,Die cutting ,Composite number ,Metals and Alloys ,02 engineering and technology ,Fibre-reinforced plastic ,Composite laminates ,Carbon fiber reinforced plastics (CFRPs) ,Industrial and Manufacturing Engineering ,Computer Science Applications ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,Fracture toughness ,0203 mechanical engineering ,Machining ,Delamination ,Modeling and Simulation ,Ceramics and Composites ,Matrix cracks ,Trimming ,Composite material ,Glass transition ,Shearing (manufacturing) - Abstract
Fast machining is essential for mass production of composite structures, and out-of-plane shearing, also known as die cutting, is appropriate for trimming. Nevertheless, little is known about shearing of polymer-matrix composites. This study was done to investigate the damaging impact of shearing conditions on carbon fiber reinforced plastic (CFRP) laminates. The clearance and temperature affected the damage progress, while the cutting speed in the tested range had negligible effect. In cross-ply laminates, delamination and matrix cracks first appeared in a narrow shearing zone, and with further loading longitudinal plies broke at the dies’ edges. Although delamination occurred only in a narrow shear-stress concentrated zone in the case of a small clearance, it was significant for a large clearance, owing to the local bending deformation. A temperature slightly lower than the glass transition temperature narrowed the delamination area, owing to the increase in the interlaminar fracture toughness as well as insignificant strength degradation of the matrix.
- Published
- 2019
- Full Text
- View/download PDF
28. Research Regarding the Increase of Durability of Flexible Die Made from 50CrMo4 Used in the Typographic Industry
- Author
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Gabriela Valeria Neamțu (Folea), Dan Dobrotă, Dorel Florea Anania, and Cristina Mohora
- Subjects
50CrMo4 steel ,flexographic flexible die wear ,die cutting speed ,die cutting length ,chrome plating ,laser hardening ,business.product_category ,Computer science ,Mechanical engineering ,02 engineering and technology ,01 natural sciences ,Die cutting ,Range (aeronautics) ,0103 physical sciences ,General Materials Science ,010302 applied physics ,Mining engineering. Metallurgy ,TN1-997 ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Durability ,Hardening (metallurgy) ,Die (manufacturing) ,0210 nano-technology ,business - Abstract
A large amount of packaging used mainly in the food industry is obtained by technologies that involve the use of machines such as those that cut with flexible die. The durability of the flexible die is a very important aspect and in this regard the purpose of the research was to identify technologies for its development. Thus, the research considered the analysis of the durability of the knives made of 50CrMo4 steel considering hard chrome-plating treatment, as well as laser hardening of the knives. For the analysis of the durability of the tools, two technological parameters were considered, namely the moment of the tightening force, which had values in the range of 50 Nm–110 Nm, and the die cutting speed, which was adjusted to values in the range of 50–60 m/min. For the analysis of the durability of the flexible die, the wear of the tools was taken into account, as well as the maximum length of the die cut material.
- Published
- 2021
- Full Text
- View/download PDF
29. Controlling the Folding of the Blank in Paperboard Tray Press Forming.
- Author
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Tanninen, Panu, Leminen, Ville, Eskelinen, Harri, Lindell, Henry, and Varis, Juha
- Subjects
- *
PAPERBOARD industry , *SUBSTRATES (Materials science) , *COMPACTING , *PRODUCT design , *STRUCTURAL optimization - Abstract
The press forming process of paperboard trays is challenging. The production of trays that fulfill all functional and visual property requirements is demanding. Blank preparation is an essential part of paperboard tray press forming. The aim of this work was to study how a creasing pattern can be utilized in the compaction and folding of the substrate in tray corners. The investigation of creasing pattern designs focused on the positioning of creases, the optimization of the amount of creases, and the width of the creases. The results of the study show that the amount of creases in the tray corner is the most important variable in the pattern design. The substrate folds more evenly and the wall of the tray is smoother when the material has the optimum amount of folds for it to compact during the press forming process. Changes in the creasing pattern primarily affect the amount of unclosed creases in the flange of the tray, which can make tight lidding of the tray impossible. The outcome of the study is a morphological analysis of the introduced creasing pattern alternatives and a selection of formulas that can be utilized in the creasing pattern design process. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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30. Microstructural Evolution and Fracture Mechanism for Scar Defect Formation on Advanced High Strength Steel During a Shearing Process
- Author
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Sutasn Thipprakmas, O. Diewwanit, W. Petchhan, P. Keawcha-um, and T. Keawcha-um
- Subjects
Shearing (physics) ,0209 industrial biotechnology ,Microstructural evolution ,Materials science ,Mechanical Engineering ,High strength steel ,02 engineering and technology ,Industrial and Manufacturing Engineering ,Computer Science Applications ,Die cutting ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Control and Systems Engineering ,Fracture process ,Composite material - Abstract
To form the required shapes from advanced high strength steels sheets, such as dual-phase (DP) steel, shearing processes are commonly used. In general, although good cut-edge characteristics can be often achieved by setting a small shearing clearance, a scar still remains a major defect on the cut-edge. Therefore, in the present study, the mechanism of scar formation of a DP steel sheet, grade SPFC980Y (JIS) subject to a shearing process was investigated and clarified based on the microstructural evolution, fracture mechanism, and a stress distribution analysis. The microstructural evolution in both tensile test specimens and sheared workpieces were observed to identify the fracture mechanism. The angle between the shear band and the elongated grain flow direction during tensile testing was examined and used to predict the angle of initial fracture and its propagation during the shearing process. With the stress distribution analysis of the shearing zone during the shearing process, the fracture could not propagate into the shearing zone and be directed to the die tip, resulting in the formation of a smooth region again. This feature occurred as a cyclic loop as the punch stroke proceeds and resulted in scar defects in the case of SPFC980Y. However, when the fracture propagation remained in the shearing zone, the fracture was not delayed and fracture was completely generated on the cut-edge in the case of a baseline SPCC steel.
- Published
- 2021
- Full Text
- View/download PDF
31. Numerical Simulation of Cropping.
- Author
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Tvergaard, Viggo and Hutchinson, John W.
- Subjects
- *
COMPUTER simulation , *CUTTING (Materials) - Abstract
Cropping is a cutting process whereby opposing aligned blades create a shearing failure by exerting opposing forces normal to the surfaces of a metal sheet or plate. Building on recent efforts to quantify cropping, this paper formulates a plane strain elastic-plastic model of a plate subject to shearing action by opposing rigid platens. Shear failure at the local level is modeled by a cohesive zone characterized by the peak shear traction and the energy dissipated by shear failure process at the microscopic level. The model reveals the interplay between shear cracking and the extensive plastic shearing accompanying the cutting process. Specifically, it provides insight into the influence of the material's microscopic shear strength and toughness on the total work of cropping. The computational model does not account for deformation of the cropping tool, friction between sliding surfaces, and material temperature and rate dependence. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
32. Adhesion and Interface Properties of Polydopamine and Polytetrafluoroethylene Thin Films
- Author
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Matthew Brownell and Arun K. Nair
- Subjects
Polytetrafluoroethylene ,Materials science ,Mechanical Engineering ,Interface (computing) ,02 engineering and technology ,Adhesion ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Die cutting ,chemistry ,Mechanics of Materials ,Density functional theory ,Adhesive ,Engineering simulation ,Thin film ,Composite material ,0210 nano-technology - Abstract
Polytetrafluoroethylene (PTFE) has been studied as a low friction surface coating since its discovery. The high wear-rate of PTFE reduces the usefulness of the polymer for mechanical purposes; however, combining PTFE with polydopamine (PDA) has been shown to greatly reduce the film wear-rate. During rubbing tests involving PDA/PTFE thin films, a tenacious layer of PTFE remains intact after substantial testing even though pure PTFE film layers are destroyed quickly. Understanding the interface mechanics that allow PTFE and PDA to adhere so well during experimental rubbing tests is necessary to improve the wear-rate of PDA/PTFE thin films. In this study, we use density functional theory (DFT) and molecular dynamics (MD) simulations to investigate the adhesive properties and interface deformation mechanisms between PDA and PTFE molecules. Steered molecular dynamics (SMD) is then performed on isolated pairs of PDA and PTFE molecules to investigate different modes of deformation from equilibrium. PDA trimer oligomers were identified as the most adhesive to PTFE and selected to use in a PDA/PTFE thin film, where nano-indentation and scratch tests are performed. Our results indicate that a combination of the unique deformation mechanisms of PDA molecules and the penetration of PTFE molecules into the PDA substrate provide the PTFE/PDA interface with its wear resistance.
- Published
- 2020
- Full Text
- View/download PDF
33. Study on Breakdown Features and Characteristics of Film at the Corrugated Plate Corner
- Author
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Gongqing Wang, Ru Li, Bo Wang, Bowen Chen, Bingzheng Ke, Ruifeng Tian, and Chuan Lu
- Subjects
Materials science ,Gravity force ,Airflow ,Reynolds number ,Mechanics ,Separation technology ,Laser ,law.invention ,Physics::Fluid Dynamics ,Die cutting ,symbols.namesake ,law ,Heat transfer ,symbols ,Shearing deformation - Abstract
Corrugated plate dryer is a extremely vital equipment for steam-water separation in the fields of heat transfer and nuclear engineering. The corrugated plate is also a commonly used steam-water separator in steam generators in nuclear power plants. It is meaningful to study the breakdown characteristics and mechanism of the water film on corrugated plate wall. Water film thickness of steady flow is measured based on plane laser induced fluorescence (PLIF) technique and time series and its fitted equation of water film thickness are obtained, respectively. Besides, fluctuation characteristics of water film are analyzed by probability density function (PDF). Based on the dimensionless approach, the water film breakdown model at the corner of the corrugated plate is established. And the calculation equation of the relative position of the water film breakdown at the corner is deprived. The specific conclusions are as follows. The theoretical equation agrees well with the relative position of the water film breakdown at the corrugated plate corner. The evolution of the surface wave of water film is carried out in time and space. The PDF curve have no significant peak characteristics. Therefore, the spectrum has no characteristic frequency, that is, the water film has multi-frequency characteristics. Gravity of water film can be ignored in the water film model. The thickness sequences for falling film is measured and fitted. The two-dimensional model of water film breakdown at the corner is set up. The equation for the film thickness when the water film is just ruptured is obtained. Relative position of the water film rupture at the corner of the corrugated plate is theoretically related only to the structural parameters of the corrugated plate, the parameters of the gas phase and the liquid phase, and the Reynolds number of the liquid film. However, in the low Reynolds number region, the airflow velocity is extremely large, which causes certain fluctuations and nonlinear characteristics of the water film boundary position. Therefore, the theoretical formula is not particularly good at predicting the relative position of the breakdown in this region. I think that this nonlinear feature has obvious chaotic characteristics. The study of the chaotic characteristics generated by shearing the liquid film by high velocity flow airflow at the corner of the corrugated plate may become a prospect for future research.
- Published
- 2020
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- View/download PDF
34. A Novel Method for Characterizing the Aggregation of Wax Crystals and An Improvement in Wax Deposition Modeling
- Author
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Chaoliang Zhu, Yang Liu, Zhihua Wang, Zhenhua Rui, and Hankun Wang
- Subjects
Wax ,Materials science ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Mechanical Engineering ,Energy Engineering and Power Technology ,02 engineering and technology ,Wax deposition ,Die cutting ,Fuel Technology ,020401 chemical engineering ,Geochemistry and Petrology ,visual_art ,0202 electrical engineering, electronic engineering, information engineering ,visual_art.visual_art_medium ,0204 chemical engineering ,Composite material - Abstract
The aggregation behavior and the subsequent deposition behavior of wax crystals own undesirable effects on the production and transportation of waxy crude oil. The understanding and prediction of these behaviors are essential to ensure economic and uninterrupted flow of waxy crude oil when the oil temperature decreases below the wax appearance temperature (WAT). In this paper, a novel method of fractal dimensional analysis was introduced to elucidate the aggregation behavior of wax crystals in different shear flow fields. The fractal methodology for characterizing wax crystal aggregation was then developed, and a blanket algorithm was introduced to compute the fractal dimension of the aggregated wax crystals. Considering the flow characteristics of waxy crude oil in a pipeline can be correlated with the shearing stress work, a modified wax deposition model focusing on shearing energy analysis was established. The results indicate that a quantitative interpretation of the wax crystal aggregation behavior can be realized using the fractal methodology. The aggregation behavior of the wax crystals is closely related to the temperature and shearing experienced by the waxy crude oil. The aggregation behavior will be intensified with decreasing temperature and shearing effect, and a wider fractal dimension distribution appears at lower temperatures when the same shear rate range is used. Furthermore, the improved model provides a method for discussing the effects of the operating conditions on wax deposition. The average relative deviation between the improved model prediction results and experimental results from the literature is 3.01–5.32%.
- Published
- 2020
- Full Text
- View/download PDF
35. Experimental evaluation of the speed mode effect on power loads of the combined mechanism of the press plate drive at cardboard die-cutting
- Author
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V. V. Vlakh, S. V. Ternytskyi, I. I. Rehey, and N. M. Kandiak
- Subjects
Mechanism (engineering) ,Die cutting ,Materials science ,visual_art ,visual_art.visual_art_medium ,Mechanical engineering ,cardboard ,Power (physics) - Published
- 2018
- Full Text
- View/download PDF
36. Synthesis of cam-gear mechanism for discrete turn of cylinders with tools for rotating waste stripping in die-cutting equipment
- Author
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I. I. Rehey, V. Yu. Olishkevych, I. M. Kravchuk, V. O. Kuznetsov, and Ya. M. Kavyn
- Subjects
Die cutting ,Materials science ,Mechanical engineering ,Stripping (fiber) - Published
- 2018
- Full Text
- View/download PDF
37. Combined drive mechanism of a press plate used in flat die-cutting press (experimental evaluation of loads)
- Author
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N. M. Kandiak, V. V. Vlakh, S. V. Ternytskyi, and O. O. Palamar
- Subjects
Mechanism (engineering) ,Die cutting ,Materials science ,Mechanical engineering - Published
- 2018
- Full Text
- View/download PDF
38. Die Cutting
- Author
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Gooch, Jan W. and Gooch, Jan W., editor
- Published
- 2011
- Full Text
- View/download PDF
39. Analysis acoustic emission and sound during the paperboard of cutting process
- Author
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Fukuzawa, Y., Nagasawa, S., Suzuki, S., Katayama, I., and Sadamoto, A.
- Subjects
- *
MATERIALS testing , *STRESS waves , *BEHAVIOR , *ATTITUDE (Psychology) - Abstract
Abstract: In industry a die cutting system is one of the important technologies for manufacturing paper packages. The cutting productivity or quality is maintained by operators’ experience. Various kinds of automatic techniques for the cutting condition have been evaluated. It was been confirmed that the acoustic estimation methods are useful for detecting the variation of the blade tip shape. From before reports, the relation of the variation of blade tip shape and applied load on the cutting edge has been clarified experimentally. The generation of acoustical signals also changes with the blade tip thickness. To investigate the origin of acoustic phenomena during the cutting process, some trials are carried out with the private designed machine. The acoustic phenomena are due to the collision behavior between the blade tip and counter plate. The cutting behavior of paperboard can be related to the acoustical differential of the displacement and vibration energy. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
- View/download PDF
40. Experimental Investigation of the Mechanisms and Performance of Active Auxetic and Shearing Textiles
- Author
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Julianna Abel, Brad Holschuh, and Rachael Granberry
- Subjects
Shearing (physics) ,Shape-memory polymer ,Die cutting ,Materials science ,Auxetics ,Soft robotics ,Shape-memory alloy ,Composite material ,Smart material ,Article ,Tensile testing - Abstract
Anisotropic textiles are commonly used in wearable applications to achieve varied bi-axial stress-strain behavior around the body. Auxetic textiles, specifically those that exhibit a negative Poisson’s ratio (v), likewise exhibit intriguing behavior such as volume increase in response to impact or variable air permeability. Active textiles are traditional textile structures that integrate smart materials, such as shape memory alloys, shape memory polymers, or carbon nanotubes, to enable spatial actuation behavior, such as contraction for on-body compression or corrugation for haptic feedback. This research is a first experimental investigation into active auxetic and shearing textile structures. These textile structures leverage the bending- and torsional-deformations of the fibers/filaments within traditional textile structures as well as the shape memory effect of shape memory alloys to achieve novel, spatial performance. Five textile structures were fabricated from shape memory alloy wire deformed into needle lace and weft knit textile structures. All active structures exhibited anisotropic behavior and four of the five structures exhibited auxetic behavior upon free recovery, contracting in both x- and y-axes upon actuation (v = −0.3 to −1.5). One structure exhibited novel shearing behavior, with a mean free angle recovery of 7°. Temperature-controlled biaxial tensile testing was conducted to experimentally investigate actuation behavior and anisotropy of the designed structures. The presented design and performance of these active auxetic, anisotropic, and shearing textiles inspire new capabilities for applications, such as smart wearables, soft robotics, reconfigurable aerospace structures, and medical devices.
- Published
- 2019
- Full Text
- View/download PDF
41. The effect of creasing method and tooling on the geometry of formed creases in the creasing process of coated and uncoated paperboard
- Author
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Ville Leminen, Antti Pesonen, Sami Matthews, Panu Tanninen, Juha Varis, Lappeenrannan-Lahden teknillinen yliopisto LUT, Lappeenranta-Lahti University of Technology LUT, and fi=School of Energy Systems|en=School of Energy Systems
- Subjects
Paperboard ,3d measurement ,Die cutting ,Materials science ,Wide area ,visual_art ,visual_art.visual_art_medium ,Process (computing) ,Formability ,Geometry - Abstract
Creasing is a method, which is used to produce grooves in fibre-based materials, such as multi-layer paperboard or composite materials such as polymer-coated multi-layer paperboard. These grooves act as folding lines, which guide and control the subsequent folding of the material. The formation of creases is crucial for the functionality of produced blanks in subsequent processes, such as press-forming where the creases have an effect on the formability of materials. The plastic deformation and geometry of creases for polymer-coated and uncoated multi-layer paperboard were investigated using two different creasing processes, flatbed die cutting and a digital creasing and cutting table with a creasing wheel. The presence and dimensions of the creasing grooves were varied to investigate the effect on the formed shapes. A wide area 3D measurement system was used to analyse and measure the dimensions of the formed creases. The results show that that the used process and tool selection has a clear effect on the formed shapes. Based on the results, recommendations for tooling selection are given. Post-print / Final draft
- Published
- 2019
42. Modeling the Torsional Cyclic Response of Direct Metal Laser Sintered Inconel 718
- Author
-
Ali P. Gordon, Firat Irmak, Sanna F. Siddiqui, and Nathan O’Nora
- Subjects
Materials science ,Deformation (mechanics) ,Laser ,law.invention ,Metal ,Die cutting ,law ,visual_art ,Shear stress ,visual_art.visual_art_medium ,Shearing deformation ,Composite material ,Cyclic response ,Inconel - Abstract
The aerospace propulsion industry has seen strides in the use of the additive manufacturing (AM) technology in the rapid prototyping and geometric design flexibility of aerospace parts, with concurrent efforts on 3D printing turbine engine blades of Inconel 718 material [1] for use in aircraft engines. The tensile, compressive and axial fatigue response of AM Inconel 718, along with associated constitutive modeling of the material response exhibited under these mechanical test conditions have been reported. However, in addition to understanding the axial behavioral response exhibited by this material, assessing the role of cyclic shear stresses, through experimental testing and constitutive modeling can provide preliminary insight into the mechanical behavior of AM Inconel 718 under multiaxial loading conditions. This study has presented a novel approach to constitutively model the experimental cyclic shearing deformation of as-built direct metal laser sintered (DMLS) Inconel 718, manufactured along varying build orientations in the xy, yz and xz planes, compared with wrought annealed Inconel 718. Specimens were subjected to completely reversible torsional fatigue tests at room temperature, under angle of twist control. The experimental cyclic shearing response was modeled through the use of the Chaboche model, from which optimized constants are reported with build orientation; and the specimen deformation, under angle of twist control, was captured through a finite-element simulation model of the cylindrical gauge section of the specimens. Overall this study yields a comprehensive understanding of the experimental and modeled cyclic shearing response of an additively manufactured metal, which is vital to develop these components to be conducive for the multiaxial fatigue conditions to which they are subjected to in the gas turbine industry.
- Published
- 2019
- Full Text
- View/download PDF
43. Surrogate Model Based Optimization for Chevron Foil Thrust Bearing
- Author
-
Gen Fu and Alexandrina Untaroiu
- Subjects
Foil bearing ,business.industry ,Thrust ,Structural engineering ,law.invention ,Bearing design ,Die cutting ,Surrogate model ,Thrust bearing ,law ,Chevron (geology) ,business ,Geology ,FOIL method - Abstract
Gas foil thrust bearings have been utilized in high speed lightweight machines for many decades. These bearings are environment-friendly and capable of withstanding extreme conditions. However, there are also some challenges for foil thrust bearings at high speed conditions, such as insufficient heat dissipation and thermal management. The heat generated by viscous shearing continues to raise the temperature inside the gas film and may cause failures. Among all the methods to enhance heat dissipation, a promising passive thermal management method is modifying the top foil’s trailing edge shape. This modification will enhance the air mixing in between the bearing pads. The aim of this study is to identify the optimal design of the top foil trailing edge shape and provide a guideline for future bearing design. A 3-D computational fluid dynamics (CFD) model for a thrust foil bearing was created using ANSYS-CFX software. The trailing edge of the top foil was modified to a chevron shape. A sensitivity study was conducted to investigate the connection between the top foil trailing edge shape and the thermal conditions in the gas film. The maximum temperature inside the air gas film is selected as the output. The design of experiments (DOE) technique was used to generate the sampling points. A surrogate model was generated based on the output data by using the neural network method. The surrogate model was used together with a genetic multi-objective algorithm to minimize the maximal temperature inside the gas film and maximize the load carrying capacity. The optimal design was then compared with the baseline model. Results suggest the optimized trailing edge shape is capable of reducing the temperature inside the gas film. This optimal design approach can be used for improvements of chevron foil thrust bearing design.
- Published
- 2019
- Full Text
- View/download PDF
44. Critical Review of Early Age Cycling Effects on the Capacity of Pile to Sleeve Grouted Connections As Treated in ISO 19902
- Author
-
Jacob Fisker Jensen, Joao Caetano, Casper Klintø Christiansen, and Andi Merxhani
- Subjects
Die cutting ,Compressive strength ,Materials science ,Shearing deformation ,Geotechnical engineering ,Pile ,Cycling - Abstract
The treatment of early age cyclic loading (EAC) on pile-sleeve grouted connections is one of the challenging problems encountered in the design of offshore jacket structures. ISO 19902 appears to be the only offshore structural design code that quantifies the strength de-rating due to EAC. However, the mechanism of EAC considered in the ISO standard is little understood. Main provision is that the strength reduction due to EAC is considered to be linearly proportional to the compressive strength of the grout. This provision is conservatively applicable for medium strength grouts. However, it is over-conservative when modern high-performance grouts are used, and it can be further argued that it actually loses its physical meaning. Thus, a further investigation into the mechanics of the problem is deemed beneficial in order to understand better its underlying mechanism. Using existing experimental evidence and a simple mechanical model, it is shown that the EAC mechanism considered in ISO 19902 triggers the grout matrix failure mechanism of the grouted connections. This behavior is characteristic of segregating grout materials. The benefit of the approach followed is that it links the interpretation of EAC to the grout material properties. The phenomenon is then understood using methods and experimental results that are well established in concrete mechanics. After a comparison with existing experimental evidence on grouted connections and concrete members, it is suggested that the strength drop for the specific shearing mechanism is independent of the uniaxial compressive strength of the grout material.
- Published
- 2019
- Full Text
- View/download PDF
45. Lateral Forces in Rolling-Cut Shearing and Their Consequences on Common Edge Defects
- Author
-
Martin Jochum, Alexander Zeiler, Andreas Kugi, and Andreas Steinboeck
- Subjects
Shearing (physics) ,0209 industrial biotechnology ,Materials science ,business.industry ,Mechanical Engineering ,02 engineering and technology ,Kinematics ,Structural engineering ,Industrial and Manufacturing Engineering ,Finite element method ,020501 mining & metallurgy ,Computer Science Applications ,Die cutting ,020901 industrial engineering & automation ,0205 materials engineering ,Control and Systems Engineering ,Shearing deformation ,Engineering simulation ,Fracture process ,business - Abstract
This paper deals with the detailed analysis of the lateral process forces in rolling-cut shearing of heavy steel plates and their impact on edge defects. Rolling-cut shearing is still the most common method of heavy-plate side trimming. However, this method can entail edge defects like uneven longitudinal shape as well as burr and fractures in the area of the cut-changeover (beginning and end of the periodical cuts). In the existing literature, neither the root cause of these edge defects nor their nexus with the upper blade trajectory (blade drive-kinematics) has been analyzed in detail. In this work, these issues will be explored based on the finite element method (FEM) simulations and measurements from an industrial plant. The complex interrelation between drive-kinematics, varying lateral force, unintended lateral motion of the upper blade, unintended variation of the blade clearance, and quality defects is analyzed. The variation of the lateral force is identified as the root cause of such quality defects and a physical explanation for variations of the lateral force is given. The detailed understanding of the shearing process serves as a solid basis for an optimization and re-design of the drive-kinematics in a future work. Measurements from an industrial plant and simulation results show good agreement and thus confirm the theory. The results are transferable to other rolling-cut trimming shears.
- Published
- 2019
- Full Text
- View/download PDF
46. Herramientas de formado y corte: caso particular de aplicación al acero laminado
- Author
-
Rodríguez Bedia, Víctor Manuel, Biezma Moraleda, María Victoria, and Universidad de Cantabria
- Subjects
Acero laminado ,Troquel ,Die cutting ,Cutting ,Rolled steel ,Corte ,Forming ,Conformado - Abstract
En este Trabajo Fin de Grado, se ha pretendido enfocar en los útiles de estampado en frio para la fabricación de componentes, entre otros del sector de la automoción. Veremos que propiedades ha de tener uno los aceros utilizados en la fabricación de componentes, las características físico - mecánicas y la ciencia química que le otorga características específicas. También la teoría que nos explica la manera de ser trabajado, junto a la normativa que se le es de obligatoria aplicación en criterios de calidad. Explicaremos la composición de un troquel, piezas y su funcionamiento, además de un repaso de la calidad del acero que lo compone. Concluyendo con la importancia de su mantenimiento y puesta a punto, crítico para el buen desempeño de dicha herramienta en su trabajo diario de 24 horas por 7 días a la semana. ABSTRACT: In this End of Degree Project, it has been tried to focus on the tools of cold stamping for the manufacture of components, among others of the automotive sector. We will see what properties must have one of the steels used in the manufacture of components, the physical-mechanical characteristics and the chemical science that gives specific characteristics. Also, the theory that explains the way to be worked, together with the regulations that are mandatory application in quality criteria. We will explain the composition of a die, parts and their operation, as well as a review of the quality of the steel that composes it. Concluding with the importance of its maintenance and fine tuning, critical for the good performance of this tool in its daily work of 24 hours for 7 days a week. Grado en Ingeniería Náutica y Transporte Marítimo
- Published
- 2019
47. Cut Surface Features in Various Die-Cutting Processes
- Author
-
Sutasn Thipprakmas and Arkarapon Sontamino
- Subjects
0209 industrial biotechnology ,Engineering ,business.industry ,Mechanical Engineering ,Regular polygon ,02 engineering and technology ,Structural engineering ,Stress distribution ,Finite element method ,Die cutting ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Mechanics of Materials ,General Materials Science ,business ,Shearing (manufacturing) ,Punching ,Blanking - Abstract
Currently, the shaped parts combined with straight, concave, and convex portions are increasingly fabricated. To produce the straight portion, the shearing theory is usually applied. As well as, to produce the concave and convex portions, the punching and blanking theories are usually applied. However, with the same die-cutting process parameters, the comparison of cut surface features of straight, concave, and convex portions has not been investigated yet. Therefore, in the present research, the comparison of the cut surface features in various die-cutting processes, including shearing, blanking, and punching processes are investigated. The finite element method (FEM) was used as a tool to investigate these cut surface features. The cut surface features were investigated and clearly identified via the changes of the stress distribution analyses. The results elucidated that with the same die-cutting process parameters, the different cut surface features were obtained. Specifically, the crack formations were easily generated in the case of blanking process, following by the shearing and punching processes, respectively. Therefore, the smooth cut surface was smallest in the case of blanking process, following by the shearing and punching processes, respectively. The laboratory experiments were carried out to verify the accuracy of the FEM simulation results. Based on the cut surface features, the FEM simulation results showed good agreement with the experimental results in terms of the cut surface features. Therefore, to design the die-cutting process parameters to meet the product requirements of complicated shapes, the understanding on these working process parameters being upon the shaped parts is necessarily.
- Published
- 2016
- Full Text
- View/download PDF
48. Fine extrusion device approach
- Author
-
Guo-Ming Huang and Jang-Ping Wang
- Subjects
0301 basic medicine ,0209 industrial biotechnology ,Engineering ,business.product_category ,business.industry ,Mechanical Engineering ,Metallurgy ,02 engineering and technology ,Edge (geometry) ,Industrial and Manufacturing Engineering ,Computer Science Applications ,03 medical and health sciences ,Die cutting ,030104 developmental biology ,020901 industrial engineering & automation ,Control and Systems Engineering ,Surface roughness ,Die (manufacturing) ,Cylinder ,Extrusion ,Hydrostatic stress ,Composite material ,business ,Software ,Blanking - Abstract
This paper proposes a new approach that combines the cutting processes for extruding a billet. A trough is laid on the die, and the ram module is used to press the billet before extrusion. The diameter of the punch does not need to be equal to that of the die. It can have two situations: negative clearance (extrusion) and zero as well as positive clearances (blanking). In this approach, a cutting process is combined with a high hydrostatic stress produced from the trough on the die cutting edge, and this can substantially eliminate fracture in the shear zone. A series of experimental tests for forming the shapes of a cylinder and spur and cycloid gears were performed. The results indicate that this approach can extrude a billet with an excellent burnished surface. The test ranges of the surface roughness for the burnished surface were 0.03–0.12 μm, and the tolerance band for the diameter ranged from IT3 to IT6. This new approach provides the precise sizes higher than those obtained using conventional extrusion.
- Published
- 2016
- Full Text
- View/download PDF
49. The Latest Technology of Wire-cut EDM
- Author
-
Yushi Takayama, Hiroyuki Uchida, Yan Niu, and Yushinori Makino
- Subjects
0209 industrial biotechnology ,Downtime ,Engineering ,business.industry ,Emerging technologies ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Manufacturing engineering ,Die cutting ,020901 industrial engineering & automation ,Electrical discharge machining ,Machining ,Data quality ,Manufacturing ,General Earth and Planetary Sciences ,Robot ,0210 nano-technology ,business ,General Environmental Science - Abstract
In recent years, requirements of “High value-added” has increased to the wire-cut EDM under the situation of the high precision requirement of industrial products or the high labor cost. For corresponding to them, focusing on “Improvement of performance being helpful for the practical cutting in factories”, we have developed advanced cutting technologies, various effective functions and a management tool for productions and quality data on our wire-cut EDM, ROBOCUT. One of the latest cutting technologies is “High precision cutting for thick work-pieces”, developed for resin molding die cutting. It greatly improves the straightness of thick work-pieces by our optimum discharge control. And we have developed “Automatic wire feeding function at the wire break point in taper cutting” that can thread the wire automatically when the wire breaks in a taper cutting of a press die with relief angles. It contributes to unmanned machining. The rotary table for ROBOCUT named “ROBOCUT CCR” expands the range of applications, so that various applications such as cutting tools, medical parts, etc, are available. The management tool for productions and quality data named “ROBOCUT-LINKi” can observe machine status in real time, and support the productions quality control, so that it can contribute to decrease the machine downtime. For factory automations, we have also promoted robotaization of ROBOCUT aggressively, and actually we have seen many ROBOCUT systems combined with FANUC robots in Europe and USA. We correspond to the needs of markets, and continue to develop new technologies to contribute to the worldwide manufacturing industry. Herein, we introduce the latest technologies of ROBOCUT.
- Published
- 2016
- Full Text
- View/download PDF
50. BADANIA I ROZWÓJ: Prasa wykrawająca z użyciem segmentu naciskającego (stabilizacja procesu wykrawania) Die-cutting press with the use of pressure segment (stabilazing of die-cutting process)
- Author
-
Iwan Regey
- Subjects
Die cutting ,Materials science ,Process (computing) ,Mechanical engineering - Published
- 2017
- Full Text
- View/download PDF
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