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首页> 外文会议>Sixth International Conference on Progress of Machining Technology: With Some Topics in Advanced Manufacturing Technology (ICPMT'2002); Sep 10-14, 2002; Xi'an, China >TOOL LIFE AND SURFACE ALTERATION IN HIGH SPEED MACHINIG OF A HARDENED NI-CR-MO BASE STEEL WITH PVD COATED CARBIDE TOOL
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TOOL LIFE AND SURFACE ALTERATION IN HIGH SPEED MACHINIG OF A HARDENED NI-CR-MO BASE STEEL WITH PVD COATED CARBIDE TOOL

机译：PVD涂层硬质合金淬硬Ni-CR-Mo基钢的高速加工中的刀具寿命和表面变化

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摘要

A hardened Ni-Cr-Mo base steel was machined with a (TiN/TiCN/TiN) PVD coated carbide tool at high speeds up to 150 m/min using different cutting fluids (at 3% concentration) delivered eonventionally at a flow rate of 5 1/min. Tool life, surface roughness (Ra), hardness values as well as the integrity of the machined surfaces were recorded and analysed. The machining results show that acceptable tool life and surface finish can be achieved when machining at cutting speed up to 100 m/min speed. Machining at cutting speeds in excess of 100 m/min resulted to drastic reduction in tool life and the formation of harder, plastically deformed and martensitic white layers beneath the machined surfaces. Lower flank wear rate, hence longer tool life, and component forces were generally obtained when machining at speeds up to 100 m/min due to the high resistance of the TiN/TiCN/TiN coating to wear as well as the stability of the coolant composition at lower cutting conditions. The coolants tend to lose their effectiveness at higher cutting speeds resulting in a "quenching" effect on the cut surface and severe chipping of the sharp cutting edge and crack formation along the tool flank face.
机译：使用（TiN / TiCN / TiN）PVD涂层硬质合金刀具对硬化的Ni-Cr-Mo基钢进行机械加工，使用不同的切削液（3％的浓度）以高达150 m / min的高速流动，流速为5 1 /分钟记录并分析刀具寿命，表面粗糙度（Ra），硬度值以及加工表面的完整性。加工结果表明，以最高100 m / min的切削速度加工时，可以达到可接受的刀具寿命和表面光洁度。以超过100 m / min的切削速度进行加工会导致刀具寿命大大减少，并在加工表面下方形成更硬，塑性变形和马氏体的白色层。由于TiN / TiCN / TiN涂层的高耐磨性以及冷却液成分的稳定性，因此在以高达100 m / min的速度进行加工时，通常可获得较低的侧面磨损率，从而延长了刀具寿命，并获得了分力。在较低的切削条件下。冷却剂在较高的切削速度下往往会失去其有效性，从而导致切削表面出现“淬火”效应，锋利的切削刃严重崩刃并沿刀具侧面产生裂纹。

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