Each machine tool discussed in previous chapters represents a basic cutting machine. Some particular cutting operation, such as turning, drilling（钻）, milling（铣）, or grinding（磨）, can be performed on each. They can be highly productive. Nevertheless（然而） each perform only a single function or at best a limited number of functions. Most parts require several different operations in their fabrication – one surface is rough machined, another superfinished（超级压光）, a hole drilled and a slot（槽） milled, all on the one part. Thus, the tool must be changed, the workpiece（工件） indexed（分度） and shafted from one machine to another. This results in much expenditure of labor and much nonproductive down-time.
One way of improving this situation is to design a machine tool on which more than one kind of cutting operation can be performed. Another is to enable to machine to perform its operation successively or even simultaneously(同时) on the same workpiece without any intermediate（中间的） handling（操作）. A third is automatic gauging（自动检验） of machined features（机械特征） with an arrangement for ejecting the finished part and inserting another blank. A final refinement is to incorporate feedback controls that regrind and even reset tools, or make other adjustments as directed automatically by gauge readings.
Complete automation of a machine tool includes all above. This, the machine is equipped not only to perform its cutting automatically but also to “decide” what adjustments must be made to machine work according to specifications（规范）.
Broadly then, automatic machining comprises cutting where all tool and work-material movements are so actuated that duplicate(完全相同的) parts may be made repeatedly without continuous attention. If cutting operations are automatic but an operator is needed to remove finished parts or reload or reset the machine, semi-automatic operation is generally said to exist. In either case, machine time is reduced and dimensional precision（尺寸精度） often improved.
Vocabulary
1.represent t. 讲述；代表；体现
2.nevertheless conj. 然而；不过
3.fabrication n. 制作
4.superfinish v. 超级压光
5.slot n. 槽；缝
6.gage n. 计量器; v. 度量；计量
7.index v. 转位
8.shaft v. 装以轴；转动；利用
9.successively ad. 接连地；连续地
10.simultaneously ad. 同时；一并地
11.eject vt. 推出；弹出
12.blank n. 坯件；毛坯
13.refinement n. 精加工；改进
14.incorporate v. 采用；转换角度
15.broadly ad. 广泛地；广阔地
16.duplicate a. 完美的 n. 复制品
1；所有标注为智造资料网zl.fbzzw.cn的内容均为本站所有，版权均属本站所有，若您需要引用、转载，必须注明来源及原文链接即可，如涉及大面积转载，请来信告知，获取《授权协议》。
2；本网站图片，文字之类版权申明，因为网站可以由注册用户自行上传图片或文字，本网站无法鉴别所上传图片或文字的知识版权，如果侵犯，请及时通知我们，本网站将在第一时间及时删除，相关侵权责任均由相应上传用户自行承担。
内容投诉
智造资料网打造智能制造3D图纸下载,在线视频,软件下载,在线问答综合平台 » 机械工程英语——Lesson 15 Automatic Machining(图文教程)
