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Copyright of Journal of Defense Sciences / Savunma Bilmleri Dergisi is the property of Turkish Military Academy Defense Sciences Institute 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 this experimental study on machinability, the effects of cutting depth and cutting tools of different profiles on the roughness of the machined surface were investigated in the turning of Al 6061 aluminum alloy. In the experiments, a constant feed rate of 0.2 mm/rev, two different cutting speeds of 125 m/min, 250 m/min and cutting depths of 0.4-0.8-1.6-2.4 mm were selected. The lowest roughness values were obtained as 0.5 µm at 250 m/min cutting speed with the SNMA coded cutting tool. As the depth of cut values decreased, the roughness of the surfaces decreased in general. However, the reverse behavior was observed in machining with SNMA tool and the highest roughness value was obtained at 0.4 mm depth of cut. When all cutting tools and cutting parameters are evaluated together, the highest roughness value was measured as 7.22 µm at 2.4 mm cutting depth with the tool coded TNMG. With the change of cutting speed, different surface roughness values were obtained according to the cutting tool type. However, the expected decrease in roughness values did not occur with increasing cutting speed. DCGT coded tool could not outperform other cutting tools in terms of surface roughness. As a result of this study, it has been determined that the machining performance of the SNMA series coated and negative rake tools is higher. [ABSTRACT FROM AUTHOR]

Copyright of Journal of International Management Research & Applications is the property of Journal of International Management Research & Applications 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.)

Wave form end mills with variable rake and helix angles are new in the machining industry, and limited information is available on their machining performance. In this study, the machining performance of wave form end mills with variable rake and helix angles on the helical cutting edge on AISI 316L austenitic stainless steel which is in the difficult-to-cut materials due to work hardening, high tool wear and build-up edge (BUE) was investigated. In this context, five different carbide cutting tools, which are wave form tools with different wavelengths (mm) and wave amplitudes (µm) (6-550, 8-250, 4-450, and 8-650) and the standard tool, were evaluated through both experimental and statistical approaches in consideration of cutting forces, surface quality, tool life criteria. In terms of cutting forces and surface quality; wave form tools exhibited higher cutting forces and surface roughness values than the standard tool in all machining conditions, due to the predominance of machining negativity in negative rake angle regions despite the advantages provided by the positive rake angle regions. On the other hand, in 8-250 and 8-650 waveform tools with smaller positive and negative rake angles (+4°, -2°, -3°) were observed low tool wear values 17.2% and 6.9%, respectively compared to the standard tool. As a result, it is thought that 8-250 and 8-650 wave form tools can be a solution in rough milling processes for the low tool life problem caused by high mechanical strength and high work hardening properties that make difficult-to-cut AISI 316L material. [ABSTRACT FROM AUTHOR]

Copyright of SDU Journal of Engineering Sciences & Design / Mühendislik Bilimleri ve Tasarım Dergisi is the property of Journal of Engineering Sciences & Design 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.)

This study provides an experimental study focusing on understanding the effectiveness of cryogenic cooling in cutting process of hardened steel under various cutting parameters. Liquid nitrogen and carbon dioxide are used in the machining performance experiments of hardened steel as cryogenic coolants. Turning process is carried out to test the role of cryogenic coolants for improving the machining performance of selected work material. A constant cutting speed and two different depth of cuts were selected as cutting parameters. To measure machining performance resultant forces and frictional condition, progression of tool wear, cutting temperature, and chip breakability, and surface quality of machined parts were considered and obtained results were also compared with the results obtained from dry machining. This study reveals that the effectiveness of cryogenic coolant to improve machining performance of this material also depends on the cutting parameters, namely depth of cut. While the effect of cryogenic coolants on cutting tool performance is limited at large depth of cut, cryogenic coolants show much better performance by showing obvious contribution for increasing tool life. Besides, it is observed that carbon dioxide substantially imcrease chip breakability. [ABSTRACT FROM AUTHOR]

Copyright of Selcuk University Journal of Engineering, Science & Technology / Selçuk Üniversitesi Mühendislik, Bilim ve Teknoloji Dergisi is the property of Selcuk University, Engineering & Architecture Faculty 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.)