放电加工

Electrical discharge machining as a nontraditional machining method can machining any kind of electrical conductive material by pulsed discharge process which erodes electrode materials. Because of its processing quality independence of part shape and material mechanical properties such as hardness, strength and toughness, EDM becomes one kind of basilic machining means and is playing an important role in the field of modern manufacturing, especially in mould manufacturing industry.

电火花加工技术通过放电蚀除材料，实现对任意导电性材料加工，而不受材料硬度、强度、韧性等力学性能及形状的限制，成为制造技术领域中重要的加工手段，在现代制造领域，特别是模具制造领域占据着重要的地位。

The results show that, in the case that workpiece is at rest, the parameters and discharging current of the discharge circuit can be calculated easily and accurately by the preset-frequency method, so the problem of calculating the parameters of discharge circuit can be solved fundamentally.

本文对用园柱加工线圈胀形管坯的电磁成形过程进行了较深入的理论分析和大量的实验研究，重点研究了放电回路的放电过程、加工线圈和毛坯系统中脉冲磁场的磁感应强度及分布和管坯在脉冲电磁力作用下的变形过程。

The study of motion characteristics,electromagnetic characteristics and oscillation characteristics of electrical particles are key composition of the EDM mechanism study.

电火花加工机理研究的相对滞后在一定程度上制约了电火花加工技术的进一步发展；放电通道中带电粒子的运动特性、电磁特性及振荡性的研究是电火花加工机理研究中的重要组成部分。

In this paper, on the basis of theoretical analysis, methods of range analysis and variance analysis are separately applied to the quantitative analysis of the relationship among gap voltage, peak current, workpiece thickness and cutting direction in the process.

本文在理论分析的基础上，采用正交试验设计，应用极差分析法和方差分析法定量研究了高速走丝电火花线切割加工中放电间隙电压量的变化特性与加工中峰值电流、工件厚度及切割方向之间的关系。

Firstly, the theory and knowledge of sparking and burning are briefly introduced. The holistic project of this experiment is designed aiming to the experiment motive. And then the micro-process technique on silicon is chosen. According to the technique, the structure and size of the micro chamber, the spark device, the gas-fired channels are designed. The mask of lithography is produced based on the design. At last, the whole burning room is produced by the techniques of photolithography, deposition, dry etching, wet etching, lift off, etc.

本文首先介绍了点火燃烧的有关原理和基本知识，然后根据提出的实验研究目标，确定了微小空间内点火特性实验总体方案，之后结合拟采用的硅微加工工艺设计确定了微燃烧室、放电点火装置、燃气通道等各部件的结构尺寸，并最终得到光刻用掩膜版图形，最后分别采用光刻、淀积、干法刻蚀、湿法刻蚀、剥离等硅微加工技术完成了实验用微燃烧室的制作。

Under the same conditions, the straightness of surfaces WEDMed in atmosphere is significantly better than that in water, and the discharge gap in atmosphere is smaller than that in water, and the surface roughness in atmosphere is nearly the same with that in water.

在其它加工条件相同情况下，气中加工的直线度都明显优于水中加工；气中加工的放电间隙都比水中的窄；气中加工的表面粗糙度值与水中加工相近。2。

The research indicated that the main electric particles forming guiding discharge channel were the electrons released from the process of the breaking up of the negative ions. During 10 microseconds after the laser pulse, the electrode also could guide discharge effectively; and it suggested the new conception of the electrode erosion, and developed new-type running disk electrode, which could discharge for a million times in atmosphere. It also suggested methods of the texturing roller of besmearing with oil film and cathodal discharge in processing. The research of the texturing roller indicated that roughness of 14 microns and the intensified depth of over 200 microns could be got.

研究表明：形成诱导放电通道的带电粒子主要是负离子解离过程释放的电子，在激光脉冲结束后10微秒内，电极都能有效诱导放电；提出了电极损耗的新概念，并研制了新型转动圆盘电极，可在大气中完成上百万次放电，提出了加工过程中负极性放电、工件表面涂介质薄膜放电的毛化工艺方法；并用之对轧辊试件进行了毛化工艺研究，毛化粗糙度可达14微米，强化深度大于200微米。

But, the basic mechanism of PEDM is unclear, dimensional precision is very difficult to get. So that, To analyze the model of discharging, to find the inbeing of PEDM and to promote technology of PEDM practical become Focus of EDM research.

但是，这项工艺的基本机理尚不清楚、尺寸精度很难确定，而且该技术缺少必要的工艺规范，因此，分析放电模型、寻找混粉电火花加工技术的本质以及混粉电火花加工工艺的实用化成为当今混粉电火花加工技术研究的热点。

In order to realize dressing of fine diamond grind-ing wheel effectively,removal behavior of metal bond for dry and wet coolants is investigated.

为有效地实现微细金刚石砂轮的修锐，建立单脉冲电火花放电去除加工的试验系统，研究金属结合剂的气中和液中电火花放电去除机理。

By means of the plating technology and the system designed and made ourselves, we call them as the direct-heat evaporating roll-pulled with vacuum piston and the helix evaporating of straight heat-wire with the negative thermal specific resistance , the align polishing ring films and the separating ones of pure gold have been plated directly at the inner wall of the capillary of Sealed-off CO〓 laser.

简便有效地使器件的输出功率、光束品质、稳定性和使用寿命都得以提高的作用效果；分析了放电驱动催化机理及催化效果与器件参数、工作状态及其中的等离子体过程的对应关系，建立了数学模型，编程数值计算了放电管内正柱区中等离子体参数分布及其与器件工作外参数的关系；利用我们设计开发的直热式真空活塞卷拖和负阻直热丝螺旋蒸镀工艺及制作的系统，在封离型CO〓激光器毛细管玻璃内壁上直接镀制出了单质金的镜面环膜和离散膜，经理论分析和实验检验，指出美国专利4756000号的环金方案将导致器件工作特性的改变和恶化，降低效率；肯定了正柱区边界部分场对建立良好的激光振荡的作用意义，明确提出了①作为高品质器件设计基础的弥散膜催化剂；②高斯管型弦驻波振动定型磨制、检测的新概念及相应的制备加工工艺；实际制出了管子，测定了其基本的工作特性和初期过程。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。