成本：包括劳动力成本，刀具成本，刀具更换时间(成本)等等。
Costs. Including labor costs, tool costs, tool changing time (cost), etc.
在孔群加工中，总加工成本由刀具成本、加工成本、非加工刀具行进时间、刀具换刀成本组成。
In holes machining, the total machining costs include tool cost, machining cost, un-tool traveling time and switching tool cost.
刀具运动轨迹设计质量的好坏，将直接影响零件的加工质量及加工成本。
Whether the tool path quality is good or bad will directly affect the machining and the machining cost of part.
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