为了要把加工的零件切削成所要求的形状与尺寸，金属切削刀具就要从工件上切除切屑。
The metal cutting tool separates chips from the workpiece in order to cut the part to the desired shape and size .
在机械加工过程中，刀具直接参与切削过程，从工件上切除多余金属层。
Needed In machining process, tool directly involved in cutting process, from metal layer of workpiece excision redundant.
有些加工，如精度要求不高或需要切除的金属量较小，也可能只需一次精切削。
Also, in some jobs, fot example, when great accuracy is not needed, or when a comparatively small amount of metal must be removed, a finishing cut may be all that is required.
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