机械工厂的切削加工有两种，分别称为“粗切削”和“精切削”。
There are two kinds of cuts in machine- shop work called, respectively, the "roughing cut" and the "finishing cut".
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.
一般地说，钢质棒料、锻件、铸件等只经一次粗切削和一次精切削即可达到所要求的形状和尺寸。
Generally speaking, bars of steel, forging, castings, etc. are machined to the required shape and size with only one roughing and one finishing cut.
本文从实用出发，系统介绍了适用于制作大型平面材料的切削性能以及适用于大型平面精铣的几种刀具结构和使用情况。
This article states machined properties of part's material, properties of cutting tool materials and some structure of cutting tool that used in large flat surface.
车削刀具可以是精车刀具或粗车刀具。粗车刀具刀尖半径较小，用 于深切削。
Turning tools. Turning tools can be either finishing or rough turning tools. Rough turning tools have small nose radii and are employed when deep cuts are made.
其实除了切削圆锥面以外，小滑板还可以用来精车内孔和外圆或实现圆柱锥度误差补偿。
In fact besides cutting the taper surface, the small feeding carriage can be also used to finish hole and other round or compensate cylinder's taper error.
在引进汽车发动机生产线上对高速半精镗、精镗缸孔的CBN刀具进行了切削对比试验。
The comparison tests of CBN cutters for high speed boring cylinder blocks are carried out on the introduced car engine production lines.
高速切削且能以高迸给率精铣。
铸造工艺采用石蜡精铸成型，使材料利用率提高77％，达到少切削、不切削目的；
Wax precision casting is adopted for the shaft sleeve, increasing material utilization ratio by 77% and realizing "less cutting and no cutting".
磨削利用磨粒来进行切削。磨削可根据不同的目的分为精磨和非精磨。
Grinding makes use of abrasive particles to do the cutting. Grinding operations may be classified as precision or nonprecision, depending on the purpose.
在实验中，分别对常规磨削和经精磨后的数控刀片在切削加工中的磨损情况进行了对比。
Wear speed were contrasted for two kinds of NC tools to conventional and fine ground respectively.
另一方面，精车则最好采用很小的进给、较小的切削深度(小于0.05英寸或0.4毫米)和较高的切削速度。
On the other hand, very fine feeds, smaller depths of cut (less than 0.05in, or 0.4mm), and high cutting speeds are preferred for finishing cuts.
这已成为少切削、无切削、精化毛坯的一种先进工艺。
This is an advanced process of less-cuttings, non-cuttings and fine-blank.
这已成为少切削、无切削、精化毛坯的一种先进工艺。
This is an advanced process of less-cuttings, non-cuttings and fine-blank.
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