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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan University of Technology Natural Science Edition is the property of Henan University of Technology Journal Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the real machining parameters, this paper investigated the effects of milling speed, feed per tooth, stepover, milling depth and coolant on the surface integrity of the integral impellers, which includes the aspects such as surface roughness, surface morphology, surface micro-hardness, microstructure and residual stress. The results show that stepover and feed per tooth have the most significant influence on the surface roughness, the smaller stepover and feed per tooth value result in smaller blade surface roughness. Specifically, when the stepover is decreased from 0.3 mm to 0.16 mm, the average roughness value reduces from 0.64 [±m to 0.48 [±m; as the feed per tooth is decreased from 0.1 mm to 0.06 mm, the average roughness value decreases from 0.62 µ m to 0.4 µ m. Both of the stepover and feed per tooth significantly impacts the surface morphology. As the stepover and feed per tooth increase, the row spacing residual height and feed residual height also increase. Since the selected machining parameters are relatively reasonable, blade surface is observed to be smooth without the production of defects such as scratches, scrapes, and burrs, etc. Moreover, under the reasonable machining parameters, the generated force and heat are insufficient to alter the surface microhardness, which fluctuates around 335HV for each machining parameters, leading to no distinct difference in the surface hardening layer compared to the substrate. The residual stresses observed are predominantly compressive stresses, with limited correlation to the stepover and milling depth. When considering the milling speed and feed per tooth, the surface compressive stress initially increases and hen decreases. Along the depth direction, compressive stress initially slightly decreases, reaches a peak, and finally stabilizes within the matrix. The maximum residual stress reaches to 275 MPa and 400 MPa in the parallel and perpendicular feed directions, respectively. Surface residual stress under he water-based coolant is much higher than that under the oil-based coolant, but decreases significantly in the depth direction. [ABSTRACT FROM AUTHOR]

The preparation of a high-performance hard coating on the surface of a carbide PCB (Printed Circuit Board) milling cutter can address the issue of rapid tool wear during cutting. In this study, AlCrN single coating, CrN/AlCrN composite coating and AlCrSiN/AlCrN composite coating were prepared on YG06 cemented carbide specimens and PCB milling cutter substrates by a multi-arc ion plating process, respectively. The mechanical properties and morphological characteristics of the three coatings were observed and analyzed using an indenter and a scanning electron microscope. The above three coated milling cutters were tested under the same conditions, and the coating performance and the tool wear mechanism were compared and analyzed. The results show that the coatings prepared by the above three processes exhibit good film-base adhesion, with the AlCrSiN/AlCrN composite coating milling cutter having the longest service life — approximately 1.5 times that of the CrN/AlCrN coating milling cutter and 1.9 times that of the AlCrN single coating milling cutter. The AlCrSiN/AlCrN composite coating demonstrates the best compactness and surface quality, making it more suitable for high-speed machining of PCB (IT158 copper-clad laminate).

Copyright of Diamond & Abrasives Engineering is the property of Zhengzhou Research Institute for Abrasives & Grinding and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical Strength / Jixie Qiangdu is the property of Zhengzhou Research Institute of Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Forest Products Industry is the property of China Forest Products Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Additive thin-walled parts have the characteristics of complex features and weak rigidity, which are prone to processing chatter vibration during the subsequent local feature milling and finishing. Therefore, this paper designed an electromagnetic magnetorheological damping fixture to semi-actively suppress processing vibration and improve processing quality. By simplifying the thin-walled part of the additive into a rectangular thin plate, considering the magneto-rheological fluid（MRF） excitation solidification damping characteristics, using the mode superposition method, the dynamic response model of the milling of the thin-walled part under the change of the magnetic induction intensity was obtained, and the fixture-workpiece system milling. The maximum error between the predicted value of dynamic response and the measured value is 21.4%. The feasibility and effectiveness of the method were verified through modal hammer percussion experiments and milling experiments, and the matching relationship between milling force, process parameters and magnetic induction intensity was fitted. Finally, the processing quality test of the typical samples was carried out. The processing flatness and roughness are increased by 80.0% and 80.3% respectively. The electromagnetic magneto-rheological damping fixture can effectively suppress the milling chatter, improve the processing stability of thin-walled parts, and improve the surface processing of the workpiece quality.

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan University of Technology Natural Science Edition is the property of Henan University of Technology Journal Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Residual stress caused by machining has always been the focus of manufacturing field. The surface residual stress state can reflect component performance and service life. In order to better understand surface and subsurface residual stress state of milled parts, the milled undeformed cutting thickness of unequal thickness was converted into the undeformed cutting thickness of equal thickness for micro milling force modeling. A 2D equal thickness undeformed cutting thickness model established by simulation was used to study the temperature when cutting titanium alloy, the surface residual stress after milling was predicted by combining the microelement force and temperature model, and predicted value, simulated value and measured value of residual stress were compared. The results show that the variation trend of simulated value and measured value of residual stress is basically the same, and the proposed residual stress prediction model established by equal thickness undeformed cutting thickness can reflect the surface stress state. [ABSTRACT FROM AUTHOR]

The cutting performance of the porous polyimide material assisted by cold air trace lubrication was investigated, and the influence law of cutting process parameters on the cutting effect (cutting force, surface finish quality, and oil content) of the porous material was explored. The results show that compared with dry cutting and low-temperature cold air cutting, the cutting temperature and the machined surface roughness of cold air micro-lubrication cutting are the lowest, and the damage to the porous runner is the smallest. The depth of cut and the feed volume are the factors that have the greatest influence on milling force and surface roughness, respectively. Defects such as chip burrs and tears are the main factors that lead to the increase in surface roughness. The existence of drawing, micro-crack, stacking, and tiny debris on the workpiece surface are the main causes for the decrease in the oil content and oil delivery rate of the material. The optimal machining parameters of the porous polyimide material in the orthogonal experiment with the aid of cold air trace lubrication are vc=(100±2) mm/min, fz=(0.3±0.01) mm/r, ap=(0.8±0.1) mm (vc is the cutting speed, fz is the feeding rate, and ap is the cutting depth). With the assist of the cryogenic minimal quantity lubrication technology, the low damage processing, high oil content, and high oil delivery rate of cage products can be obtained.

Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the problems of poor surface quality and low fatigue performance of TC4 titanium alloys by SLM, the influences of the milling processes on the surface integrity and fatigue performance of the additive parts were studied by three-point bending fatigue tests of additive parts before and after milling. The results show that after milling, the surface roughness Ra of the additive parts is reduced from 12.57 µm to 0.32 µm, the surface hardness is increased from 353.0HV to 434.3HV, fatigue life of additive parts is increased from 48 272 cycles to 155 463 cycles. After milling, the location of fatigue source of additive parts is transferred from the surface and subsurface to the interior of the specimen, and the fatigue fracture mode is changed from quasi-dissolution fracture to ductile fracture. The surface integrity of the milled specimens is greatly improved, the fatigue crack emergence and expansion of surface fatigue cracks are suppressed, and the fatigue performance is significantly improved after milling of the additive parts. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan University of Technology Natural Science Edition is the property of Henan University of Technology Journal Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China Medical University is the property of Journal of China Medical University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to obtain the ideal surface residual stress of GH4169 milling surface,the optimal interval division method of milling process parameters was proposed,and the orthogonal test of GH4169 milling was designed.The order of the influence of the process parameters on the residual stress was determined by the experiment results and the change trend of the residual stress with the increasing of the process parameters was analyzed.The optimal intervals of process parameters were determined according to the proposed method,and the reliability of the optimized interval was verified by experiments.

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

On the basis of the study on the circular-arc-tooth-trace cylindrical gear,the milling method of the elliptic-arc-tooth-trace cylindrical gear which can realize whole teeth width meshing is proposed. By analyzing the ideal geometric parameters,the equations of tooth surface and contact ratio are deduced. The forming processes of the machining tools and elliptic-arc-tooth-trace are analyzed by the rack and pinion model,and the milling principle is put forward according to which the milling of the gear is completed. The profiles of the gear machined by the oblique mounting tools are all involute in the radial sections,and the expansion curve of the tooth trace on the reference cylindrical surface is part of the ellipse. The convex and the concave tooth trace have the same geometric parameters. The processing principle can completes the high-efficiency milling of the gear,and also can be used for grinding.

Copyright of Journal of Guangdong University of Technology is the property of Journal of Guangdong University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan University of Technology Natural Science Edition is the property of Henan University of Technology Journal Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Variable helix cutter can reduce the location error of the finished surface,leading to a more accurate machining operation.Considering the geometries of variable pitch and helix angle,and the piecewise continuous regions of the cutting,an analytical model for predicting the cutting force for milling process with variable helix angle cutter is presented.The validation of the proposed model is conducted via some cutting tests.Based on proposed model,the influence of variable helix character on cutting force is studied.Analyses show that cutting force coefficients obtained from the traditional cutting tool could be used to accurately predict the cutting forces of the variable helix cutting tool.The bigger helix angle corresponds to the smaller cutting force and bigger width of phase.The character of variable-helix angle has more significant influence on cutting force when axial depth of cut is larger.

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ａｉｍｉｎｇ ａｔ ｔｈｅ ｐｒｏｂｌｅｍ ｏｆ ｍｉｌｌｉｎｇ ｆｏｒｃｅ ｃｈａｎｇｅ ｐｒｅｄｉｃｔｉｏｎ ａｎｄ ｃｏｎｔｒｏｌ ａｂｏｕｔ ｔｈｅ ａｅｒｏ￣ｅｎｇｉｎｅ ｂｌａｄｅ ｄｕｒｉｎｇ ｔｈｅ ｍｅｃｈａｎｉｃａｌ ｐｒｏｃｅｓｓ￣ ｉｎｇꎬ ｂｙ ｓｔｕｄｙｉｎｇ ｔｈｅ ｍａｉｎ ｐｒｏｃｅｓｓ ｐａｒａｍｅｔｅｒｓ ｏｆ ｍｉｌｌｉｎｇ ｍａｃｈｉｎｉｎｇ ｓｙｓｔｅｍꎬ ｔｈｅ ｏｒｔｈｏｇｏｎａｌ ｔｅｓｔ ｍｅｔｈｏｄ ｗａｓ ｕｓｅｄ ｔｏ ｄｅｔｅｒｍｉｎｅ ｓｅｖｅｒａｌ ｓｅｔｓ ｏｆ ｐｒｏｃｅｓｓ ｐａｒａｍｅｔｅｒ ｓｃｈｅｍｅｓꎬ ｔｈｅ ｔｗｏ￣ｄｉｍｅｎｓｉｏｎａｌ ｍｉｌｌｉｎｇ ｍｏｄｅｌ ｏｆ ＡｄｖａｎｔＥｄｇｅ ＦＥＭ ｂｌａｄｅ ｗａｓ ｅｓｔａｂｌｉｓｈｅｄꎬ ａｎｄ ｔｈｅ ｓｉｍｕｌａｔｉｏｎ ｔｅｓｔ ｏｆ ｂｌａｄｅ ｍｉｌｌｉｎｇ ｗａｓ ｃｏｍｐｌｅｔｅｄ. Ｔｈｅ ｍｉｌｌｉｎｇ ｆｏｒｃｅ ｏｆ ｓｉｍｕｌａｔｉｏｎ ｔｅｓｔ ｗａｓ ｅｘｔｒａｃｔｅｄꎬ ｂｙ ｕｓｉｎｇ ｔｈｅ ｖａｒｉａｎｃｅ ａｎａｌｙｓｉｓ ｔｏ ｄｅｔｅｒｍｉｎｅ ｔｈｅ ｓｔｒｅｎｇｔｈ ｏｆ ｔｈｅ ｉｎ￣ ｆｌｕｅｎｃｅ ｏｆ ｄｉｆｆｅｒｅｎｔ ｐｒｏｃｅｓｓ ｐａｒａｍｅｔｅｒｓ ｏｎ ｔｈｅ ｃｈａｎｇｅ ｏｆ ｍｉｌｌｉｎｇ ｆｏｒｃｅ. Ｔｈｅｎꎬ ｂｙ ｕｓｉｎｇ ｔｈｅ ｓｔｒｏｎｇ ｉｎｆｌｕｅｎｔｉａｌ ｐａｒａｍｅｔｅｒｓ ｔｏ ｄｅｓｉｇｎ ｃｏｎｔｒａｓｔ ｔｅｓｔꎬ ｔｈｅ ＢＰ ｎｅｕｒａｌ ｎｅｔｗｏｒｋ ｍｉｌｌｉｎｇ ｆｏｒｃｅ ｐｒｅｄｉｃｔｉｏｎ ｍｏｄｅｌ ａｎｄ ｔｈｅ ｍｕｌｔｉｖａｒｉａｔｅ ｌｉｎｅａｒ ｒｅｇｒｅｓｓｉｏｎ ｍｉｌｌｉｎｇ ｆｏｒｃｅ ｐｒｅｄｉｃｔｉｏｎ ｍｏｄｅｌ ｗｅｒｅ ｅｓｔａｂｌｉｓｈｅｄꎬ ａｎｄ ｔｈｅ ｐｒｅｄｉｃｔｉｏｎ ａｂｉｌｉｔｙ ｏｆ ｔｈｅ ｔｗｏ ｐｒｅｄｉｃｔｉｏｎ ｍｏｄｅｌｓ ｏｎ ｔｈｅ ｍｉｌｌｉｎｇ ｆｏｒｃｅ ｗａｓ ｃｏｍｐａｒｅｄ ａｎｄ ａｎａｌｙｚｅｄ. Ｔｈｅ ｒｅｓｅａｒｃｈ ｒｅｓｕｌｔｓ ｉｎｄｉｃａｔｅ ｔｈａｔ ｔｈｅ ｉｎｆｌｕｅｎｃｅ ｏｆ ｍｉｌｌｉｎｇ ｄｅｐｔｈ ｏｎ ｔｈｅ ｃｈａｎｇｅ ｏｆ ｍｉｌｌｉｎｇ ｆｏｒｃｅ ｉｓ ｔｈｅ ｓｔｒｏｎｇｅｓｔꎬ ｗｈｉｌｅ ｔｈｅ ｏｔｈｅｒｓ ａｒｅ ｗｅａｋｅｒ. Ｔｈｅ ｐｒｅｄｉｃｔｉｏｎ ａｃｃｕｒａｃｙ ａｎｄ ｓｔａｂｉｌｉｔｙ ｏｆ ＢＰ ｎｅｕｒａｌ ｎｅｔｗｏｒｋ ａｒｅ ｂｅｔｔｅｒ ｔｈａｎ ｔｈａｔ ｏｆ ｍｕｌｔｉｐｌｅ ｌｉｎｅａｒ ｒｅｇｒｅｓｓｉｏｎ ｏｎ ｔｈｅ ｗｈｏｌｅ. [ABSTRACT FROM AUTHOR]

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To explore the regulation of tool wear on milling surface of DD5 under the conditions of dry cutting and water-based minimum quantity lubrication(WMQL)， carbide tool with four blades and PVD-TiAlN coating， super depth of field microscope and scanning electron microscopy(SEM)were employed. Taking the wear width of minor flank surface of cutting tool as the evaluation indicator， tool wear forms and wear mechanism were analyzed and studied. Three-dimensional measuring system profiler was used to measure the machined surface roughness. The result shows that， compared to dry cutting， water-based MQL technology can prolong tool life and improve the milling performance. The wear of carbide tool is caused by adhesion wear， oxidative wear， abrasive wear and diffusion wear. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Abalone is a main commercial shellfish in China. Fouling organisms such as Hydroides, Balanus and Ostrea plicatula are harmful for shellfish cultivation. It's common to see lots of fouling organisms adhering on abalone shellfish in Fujian cultivation areas. Fouling organisms will increase the burden and make activities and feeding of abalone hard. The breathing holes are blocked by fouling organisms, which is another danger and may cause abalone suffocation. In this study removal technology was researched to keep the growth of abalone well. We know electric machines such as milling machine, electric motor saw and grinding machine have a certain value in use and the method could be used on removing fouling organisms. In order to verify the optimal machine and improve the removal process, the research focused on the impacts of removal method by machine and its parameters. Survival rate was one of the most important indices for the evaluation of removal processing, and removal speed was the other. The quality of removed shellfish of abalone needed to be judged by sensory evaluation. The comprehensive point was based on shellfish integrity, fouling organisms remained and abalone vitality. Hand held milling machine, electric motor saw and grinding machine were tested separately to remove the fouling organisms. The effects of different machines on removal speed and survival rate were compared, and the effects of different machines on sensory evaluation standard of abalone were analyzed simultaneously to select the optimal machine on removal. Then, the selected machine was tested to make follow-up testing. Different rotary files with the diameter of 6 mm (cylindrical round head, conical round head and conical tip) and different rotating speeds (17 000, 20 000, 23 000, 26 000 and 30 000 r/min) were tested respectively to get the optimal parameters. The results indicated that the optimal machine is hand held milling machine because it could provide stable performance of removal and keep a high survival rate. Although the fouling organisms were removed quickly and thoroughly by grinding machine, the survival rate of abalone was declined significantly after removing. The removal speeds of electric motor saw and hand held milling machine were very close. The score of fouling organisms remained increased significantly because the fouling organisms in the shellfish ditch were removed completely by milling machine with conical round head file. When the milling machine rotating speed was at 20 000-30 000 r/min, the removal speed increased significantly. The temperature of abalone was on the rise when the rotating speed was higher than 23 000 r/min, but the abalone vitality declined quickly with the increasing of the temperature of abalone. Through the test of using the optimal machine to remove fouling organisms, the optimal combination of the parameters above was obtained, which are using hand held milling machine with 6 mm diameter conical round head file, and its rotating speed is 20 000 r/min. Under this condition, the removal speed is 72.69 fouling organisms per minute, the survival rate is 98.87%, and the score of shellfish integrity, fouling organisms remained and abalone vitality is respectively 9.85, 9.72 and 9.81. The study provides reference for application of removal technology of fouling organisms on abalone shellfish. [ABSTRACT FROM AUTHOR]

The system parameters in the process of milling generally have randomness, which influences the stability of milling. The neural network was used to make a comprehensive analysis of the effects of random factors in milling, and a method for the reliability analysis of regenerative chatter stability in milling was proposed. A dynamic model for regenerative chatters of milling was established, and the stability lobe diagram was obtained by means of full discretization.The neural network was applied to approximate the functional relationship of the limit axial cutting depth,and the reliability was then calculated with the Monte Carlo method and first order second moment method, respectively. Finally, the results of an example were used to demonstrate the efficiency and accuracy of the proposed method based on the neural network. [ABSTRACT FROM AUTHOR]

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Milling experiments of Ti40 burn-resistant titanium alloy are performed using three kinds of polycrystalline diamond (PCD) tools with various diamond grain sizes (i.e., 0.5, 10 and 30 μm). The morphology of PCD tools after milling is observed using three-dimensional optical microscope and scanning electron microscopy. Failure mechanisms of PCD tools and their relation between various diamond grain sizes and tool wear are analyzed. The results indicate that the PCD tool life is longer when the contained diamond grain size is smaller. With the mechanical-thermal effects during milling, abrasion and adhesion are the main wear mechanisms of PCD tools. However, the main fracture mechanisms are micro-crack, micro-chipping and spalling of rake face and flank face, which usually take place at the position with a critical depth (i.e., 2.5—3.0 mm) in the initial wear stage. Local fragmentation occurs in the latter wear stage. Micro-cracks are the main factor leading to micro-chipping and spalling of tool rake face and flank face. [ABSTRACT FROM AUTHOR]

In view oi controlling und optimizing of edge quality of polymer bounded explosive (PBX), the macroscopic and rnieroseop e characteristics a.s well as the formation mechanisms of edge spalling formed by milling a HMX-based PBX are studied using microscopic photography and scanning electron micro­scope (SEM). Research results show that the edge spalling is formed hy crack expanding toward inside workpiece at a large cutting depth, while the edge integrity is battAT whftn thr cmriijg drpih is not larger than 0. I mm. Intact particles are few in the region of edge spoiling due to transcrystalline fracture and twin crystal separation of damaged explosive particles, and the micro-damages, such us crack along crys­talline boundary, polymer cracking and void, are mainly due Lu tensile stress and sheur stress when u crack expands toward free-surface. Abstract: In view oi controlling und optimizing of edge quality of polymer bounded explosive ( PBX ), the macroscopic and rnieroseop e characteristics a.s well as the formation mechanisms of edge spalling formed by milling a HMX-based PBX are studied using microscopic photography and scanning electron micro­scope (SEM). Research results show that the edge spalling is formed hy crack expanding toward inside workpiece at a large cutting depth, while the edge integrity is battAT whftn thr cmriijg drpih is not larger than 0. I mm. Intact particles are few in the region of edge spoiling due to transcrystalline fracture and twin crystal separation of damaged explosive particles, and the micro-damages, such us crack along crys­talline boundary, polymer cracking and void, are mainly due Lu tensile stress and sheur stress when u crack expands toward free-surface. [ABSTRACT FROM AUTHOR]

Using the Chebyshev segmentation method to discrete the time period contained in delay differential equation， the Newton second-order difference quotient method was used to calculate the motion vector of cutter at each time endpoint， then the transfer matrix of milling system was obtained， and the system stability was determined by the Floquet theory. Using the above methods， a two-degrees of freedom milling system stability issues was investigated to get system stability lobe diagrams. The results showed that under the same calculation accuracy， the points needed to cut the time period by the Chebyshev segmentation are less than those by the average segmentation， and the computational efficiency of the Chebyshev segmentation is higher. When the time period is divided into the same parts， the stability lobe diagrams gotten by the Chebyshev segmentation method are more accurate than that of the other. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to improve the weakness that for the processing method of the traditional thin-walled parts, the processing precision cannot be guaranteed and the productivity is low, aiming at the special purpose of the typical thin-walled parts within turbine combustor, the struc­ture and material of the thin-walled parts were analyzed. The processing, processing craft，processing program and detection on important surfaces were summarized and the problems required to be noticed during processing preparation，fixing scheme，rough machining and finish machining were emphatically analyzed. A qualified and efficient processing method in accordance with the production practices was proposed， and the VMC ( vertical machining centre) KVC800 and numerical control process technology were utilized to solve the difficulties during the processing. The research result shows that，for the thin-walled parts with complex structure，thin wall，multiple surface curves and high de­mand on precision，the numerical control processing method cannot only be used to produce satisfactory parts，but also to reduce the process­ing procedure and improve the qualities of the parts. It will be of availability and effectiveness if it is applied in practical production. [ABSTRACT FROM AUTHOR]

The process damping in milling of Titanium alloy is analyzed and verified experimentally. Titanium alloy used commonly in aviation industry is one typical difficult-to-machine material. Chatter usually occurs in machining of Titanium alloy because of high unit cutting force, which results in poor surface quality and damaged tool. Thus, chatter is one serious restriction for the quality and efficiency of aeronautical manufacture. The process damping results from ploughing effect, which was caused by interference between flank face and machined surface. The paper calculates the indentation area and resistance caused by interference in the milling of typical Titanium alloy and establish nonlinear model which consider process damping. The computing results indicate that limit cutting depth at low speed can be improved significantly relative to linear model and the experimental results indicates that the model can predict stability limitation at low speed accurately. [ABSTRACT FROM AUTHOR]