阐述钢球硬磨加工中产生的磨削烧伤并探讨磨削烧伤的危害性，目的是控制产品加工中的损耗，降低产品成本。
Grinding burn and the harm during the hard grinding of steel ball are elaborated, the purpose is to control the loss of production process and decrease the cost of product.
它基本上由在淬硬钢衬套下将零件夹持到位的夹持装置组成，钻孔作业中钻头穿过这些衬套，通过它们来导向。
Basically it consists of a clamping device to hold the part in position under hardened-steel bushings through which the drill passes during the drilling operation. The drill is guided by the bushings.
真空脱气机与果汁接触部分均用优质不锈钢和中硬食用橡胶制成。
The contact part of vacuum tank with the juice are using high quality stainless steel and medium hard rubber consumption.
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