Papers by Keyword: Tool Performance

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Authors: Gusri Akhyar Ibrahim, Che Hassan Che Haron, Jaharah Abd. Ghani
Abstract: The great advancement in the development of carbide cutting tool with super-hard coating layers taken place in recent few decades, can improve the performance of cutting tool and machinability of titanium alloy. The turning parameters evaluated are cutting speed (55, 75, 95 m/min), feed rate (0.15, 0.25, 0.35 mm/rev), depth of cut (0.10, 0.15, 0.20 mm) and tool grade of PVD carbide tool. The results that tool life shows patterns of rapidly increase at the initial stage and gradually increased at the second stage and extremely increased at the final stage. The trend lines of surface roughness have are the surface roughness value is high at first machining after that regularly decreases. Work hardening of the deformed layer beneath machined surface caused higher hardness than the average hardness of the base material. However, the softening effect also occurred below the machined surface. Segmentation or serration at the chip edge was caused by high strain and pressure during machining.
1050
Authors: Tadahiko Watanabe, Tsuyoshi Doutsu, Tsutomu Nakanishi
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Authors: Evgeniy V. Pavlov, Leonid M. Chervyakov
Abstract: The possibility to improve the conditions of cutting rotary workpieces with intermittent areas by applying conventional tool materials is limited. However the use of tools with working members made from polycrystalline ultra-hard materials (composites) can be very efficient, provided that a negative influence of load impacts on the tool point and the major cutting edge at the moment of the tool lead-in is mitigated.The described method of turning (boring) intermittent surfaces offers more rational conditions for the contact between the tool cutting member and machined workpiece surface and permits eliminating negative effects of impact loads on the tool point. Proper conditions of cutting intermittent surfaces by tools made from 03 composite (petbor) or 10 composite (hexanite-r) can improve machining efficiency by up to 25% due to the intensification of cutting operations as well as to decrease tool purchase expenses by about 20%.
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