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论述了一般切削加工中刀具的最大生产率使用寿命、最低工序成本使用寿命和最大利润率使用寿命；导出了工件工序总成本的数学模型，以最低工序成本为目标进行了切削用量优化，给出了选用切削用量的方向及范围．
The maximum productivity, minimum service life and maximum profit margin of the tool in general machining are discussed. The mathematical model of the total cost of the work process is deduced, and the optimization of the cutting cost is carried out with the aim of the lowest work cost. Choose the direction and extent of cutting.