Cubic boron nitride tool wear in interrupted hard cutting
Cubic boron nitride tool wear in interrupted hard cutting
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DOI：
10.1016/s0043-1648(99)00012-5
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发表时间：
1999-04
期刊：
影响因子：
5
通讯作者：
Y. Chou;C. Evans
中科院分区：
文献类型：
--
作者：
Y. Chou;C. Evans
研究了淬火 M50 钢断续车削中的立方氮化硼 (CBN) 刀具磨损情况。目标是确定断续切削过程中的主要磨损机制，特别是研究 CBN 含量的影响。结果表明，高 (CBN-H) 和低 (CBN-L) CBN 含量刀具之间的磨损特性存在显着差异。与泰勒的刀具寿命方程相反，CBN-L 的刀具寿命在中等切削速度下得到优化。相比之下，CBN-H 的刀具寿命随着切削速度的增加而单调下降。此外，CBN-H 对断续切削的敏感度低于 CBN-L，随着断续频率的增加，刀具寿命持续下降。研究表明，CBN-H 具有较高的硬度和断裂韧性，因此具有更强的抗机械磨损能力，这在断续切削中变得更为重要。然而，CBN-H 中的金属结合剂与工件材料具有高亲和力，因此会在高切削速度下导致快速热激活磨损。
Cubic boron nitride (CBN) tool wear in interrupted turning of hardened M50 steel has been investigated. The goal was to identify the dominant wear mechanism during interrupted cutting, and in particular, to study the effect of CBN content. Results show significantly different wear characteristics between high (CBN-H) and low (CBN-L) CBN content tools. Contrary to Taylor's tool life equation, tool life of CBN-L is optimized at a medium cutting speed. In contrast, CBN-H shows a monotonic decrease of tool life with increasing cutting speed. Moreover, CBN-H is less sensitive to interrupted cutting than CBN-L, which shows consistent decrease of tool life with increasing frequency of interruption. It is suggested that the higher hardness and fracture toughness of CBN-H result in greater resistance to mechanical wear that becomes more dominant in interrupted cutting. However, the metallic binder in CBN-H has high affinity with workpiece materials and, therefore, results in rapid thermally activated wear at high cutting speeds.