工件

Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验，运用工艺实验和理论分析相结合的方法，重点做了以下工作：(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因，并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理；(2)以混合硅粉的电火花加工为例，实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律，并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据；(3)在实际加工中，由于粉末的加入使放电间隙变大，这使得混粉电火花加工的尺寸精度难以控制，本文利用三元线性回归的方法，在实验数据的基础上，建立了两种电火花加工过切量的计算公式；(4)将正交试验法应用于混粉电火花加工实验研究，并通过对实验指标极差的直观分析，得出各电参数对加工指标影响的敏感程度。

Based on 6-dimision forces and machining currents, intelligent on-line monitoring and controlling the interelectrode gap is realized on the dissertation. The relation among 6-dimision forces received by cathode, machining currents and interelectrode gap is investigated widely and deeply.

本课题从电解液作用在阴极上的六维力及加工电流信号两个全新的角度入手，以平面、斜面、叶片型面三种工件的电解加工为对象，进行了电解加工间隙在线检测及智能控制的研究，对六维力、加工电流与加工间隙之间的关系进行了广泛而深入的探索。

pulse electrochemical finishing ; flow field ; interelectrode gap

基本原理是以周期性间歇脉冲电流代替直流，使工件阳极在加工

It provides good help, and imitates operating interlace and processing movement of cutting tools, It also provides effection of operated workpiece.

该系统模拟了数控铣床的操作界面、刀具的运动过程以及工件加工后的效果，并提供了友好的帮助系统。

Invar 36 is a kind of low expansion alloy, and it is difficult to machine because of its plastic, ductility and low heat conductivity. During Grinding, the part surface is easy to burn and wound for high grinding temperature and wheel adhesion.

Invar 36是一种低膨胀合金，其塑性大、韧性高、热导率低，磨削时所产生的磨削力大，磨削温度高，工件表面易于烧伤和划伤，对砂轮的粘附较严重，属于典型的难于加工材料。

This paper mainly introduces the electrical characteristics of the Robot MOSFET Arc Welding Invertor and its arc welding technological properties. Emphases are laid on the analyses of the current and voltage wavefonns of the main circuit as well as the energy loss of the MOSFETs. The different static characteristic curves and parameters of electrical reactance are also discussed.

研究了机器人场效应管式弧焊逆变器的电气性能和弧焊工艺性能，并着重对其逆变主电路电流、电压波形、管组功耗进行分析研究，以及探讨如何采用不同形状的外特性曲线与合理设计电子电抗器的电参数，从而提高弧焊机器人对不同工件开关、不同弧焊方法的适应性，实现贫飞溅的焊接。

It is improved clamping device with involute cam ,in order to carry out two-way clamping of the workpiece.

对渐开线凸轮夹紧机构进行了改进，使其能够对工件进行双向夹紧。

The anodic treatment refer to the use electro-chemical means that the work piece sufficient is the anode, serve electrolytic oxidation processing, causes to form has the adherence oxide layer in the keelson superficial procedure.

阳极处理（Anodic oxidation 或anodizing ）是指利用电化学方法，将工件充为阳极，施以电解氧化处理，使形成具有密着性的氧化层于底材的表面程序。

Guide along the penciled cutting line so that the kerf falls into the waste or surplus material.

让锯口指示线沿着工件上的墨线前行，也就是锯口落在了废弃或者富余的材料上。

With the workpiece movement, the direction of synchronous sliding hole formed by cutting a kerf.

随着工件移动，小孔按切割方向同步横移形成一条切缝。

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。