在切削过程中,刀具磨损到一定限度就要更换。刀具在两次刃磨之间所能切削的总时间称为刀具耐用度。在具体加工条件下,刀具耐用度随着叨削用量,特别是切削速度的增大而减小。众所周知,生产率和成本与切削量、切削速度有关,因而刀具耐用度将直接影响到加工过程的生产率和成本。目前,一般有四种刀具耐用度[1][2][3][4]:(1)最大耐用度 t~M:因对应的切削速 In the cutting process, the tool wear to a certain limit will be replaced. The total time that a tool can cut between sharpening is called tool durability. Under specific processing conditions, the tool durability decreases with the amount of cutting, especially the cutting speed increases. As we all know, productivity and cost and the amount of cutting, cutting speed, so tool durability will have a direct impact on the productivity and cost of the process. At present, there are generally four kinds of tool durability [1] [2] [3] [4]: ​​(1) maximum durability t ~ M: due to the corresponding cutting speed