工件

CNC lathe to use more three-jaw self-centering chuck gripping the workpiece; shaft workpieces can also be used to support the workpiece tailstock top.

数控车床多采用三爪自定心卡盘夹持工件；轴类工件还可采用尾座顶尖支持工件。

Arc-glow plasma depositing technique is a new surface coating method. With the help of vacuum arc discharge, a cold cathode arc source continually emits ion beams of coating elements with high currency density and high ionizing ratio.Upon the ion bombard and diffusion work on, the surfaces of the parts form deposited layers, diffusion layers. In this study, a commercial magnesium alloy AZ91 was coated with Ti film layer.

加弧辉光离子渗镀技术将辉光放电与弧光放电有机地结合起来，利用辉光放电空心阴极效应使工件迅速升温，同时在真空容器壁上设置一个或多个金属阴极电弧靶源，利用真空电弧放电而不断地发射出高能量、高电流密度、高离化率的欲渗金属离子流，依靠扩散和离子轰击作用快速渗入工件表面层，在工件表面可以形成渗层、镀层、渗镀结合层。

Because the characters of workpiece are mainly linear and circinal, Hough transform is adopted to gain the line and circle of workpiece in edge space which is detected by Canny edge detector.

针对工件的主要特征是直线和圆形的特点，在利用Canny边缘检测算子进行了边缘检测以提取工件的边缘特征之后，根据Hough变换原理在边缘空间中实现了工件的直线及圆特征的提取。

The tracked shot-blast machine is with simple operation. Put the work-pieces into tracked rubber roller and close the shot-blast chamber door. Then setup shot-blast time and push the RUN button. Now, the shot-blast cleaning is beginning. The track circumrotates in the forward direction. The work-pieces can be equably and completely cleaned with equal emission of high-speed shots from the impeller of shot-blaster.

履带抛丸机操作简单，将工件放入橡胶履带滚筒中，关闭抛丸室门，设定抛丸时间，操作人员按下&运行&按钮，抛丸清理开始，履带正向旋转，使工件持续收到抛丸器叶轮中高速抛出的弹丸均匀抛射，工件可完全、均匀地得到清理。

There are a lot of technological difficult points involved in NC machining graphic simulating, this thesis has mainly told about the line and arc interpolation algorithm, vertices of triangle mashes modeling, fast inquiry method for solid stock data, the algorithm of intersect the stock with the swept volume of a cutter, the cutter tool real-time removing display and so on.

图形仿真涉及到的技术难点比较多，论文主要对直线、圆弧的插补算法，工件的三角网格建模和显示技术，工件数据的存储和快速查询方法，刀具扫掠体和工件的求交算法，图形的快速局部消隐算法，刀具的动态显示等方面进行了详细的介绍。

In addition to the pad with the installation tool, the workpiece can be based on length of the workpiece in the following of mats equidistant not put pieces of wood (cutting in with the check in with the release, the extension units to ensure normal feeding), pieces of wood directly on the bed pad The thickness of the body in order to be able to firm up slightly better job, made of wood semi-circular pit, run-time increase in lubricating oil.

垫块 除跟刀架装置外，还可根据工件长度，在工件下面垫放不等距的木块(在切削中随放随取，保证拖板正常进给)，木块直接垫放在床身上其厚度以能轻微托牢工件为宜，木块制成半圆弧凹坑，运行时加机油润滑。

This paper introduces structure,working principle,force analyzing and advantage of the clamp using in cutting bearing hole of coal car whee3. A system of the ultrasonic elliptical vibration cutting with the single longitudinal animation was developed.

利用这种结构研制了一套单激励超声椭圆振动车削系统，采用PCD刀具对LY12实心件和薄壁筒工件进行了精密切削实验，实验结果表明椭圆振动切削可以大幅度降低切削力，明显改善薄壁工件的形状精度，同时工件还具有较好的表面粗糙度。

It also elaborates on the reasonable choices of the geometric parameters and cutting parameters of the cutting tool materials, cutting tools to ream, drill and mill high strength steel and super-high strength steel.

在选择切削速度时，在工件材料的强度和硬度较高的情况下，应适当降低切削速度，减小刀具每齿进给量，按工件材料的强度选择铣削速度，按工件材料的硬度选择铣削用量。

Introduction The chamfering performed to deburr the edge of a workpiece after the machining process is necessary to obtain workpieces with a certain quality.

工件在完成加工后，为保证工件的质量，用斜面清除工件边角的毛刺很很有必要的。

These issues include: the main axis may cause a similar problem with the main axis of the fault has affected the accuracy of bending; workpiece clamping possible problem is that the workpiece center and the main discrepancies, which could lead to instability in rotating workpiece; servo motor failure: the feed system Ball Screw bending and oil do not lead to rust long run can also be caused by poor, such as the same issues.

这些问题包括：主轴主要可能引起类似问题的故障有主轴弯曲影响精度；工件装夹方面可能的问题是工件中心和主轴不一致，由此可能导致工件转动不稳；伺服电机出现故障：进给系统中滚珠丝杠的弯曲和长时间不上油导致生锈运行不畅等也可能引起相同的问题等。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。