在大量飞灰长期反复切削作用下，管壁表面将产生磨损。
Under the effect of a large amount of fly ash treated by cutting, the wall surface will produce wear.
金刚石颗粒是孕镶金刚石工具中能对工件起切削作用的唯一元件，如何使它们能得到充分的利用是工具设计制造者最关心的问题。
Diamond grit is the only element in pregnant diamond tools playing cutting function. How to make full use of the diamond is an interesting problem concerned by tool designers and manufacturers.
分析了强力切削交流伺服进给系统各组成环节及作用，对机械传动装置部分建立了模型。
This paper analyzed AC servo heavy cutting feed system component parts and their actions, and built model about mechanical transmission equipment section.
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