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摘要电火花线切割加工是线电极电火花加工的简称，是电火花加工的一种。被切割的工件作为工件电极，钼丝作为工具电极，脉冲电源发出一连串的脉冲电压，加到工件电极和工具电极上。钼丝与工件之间施加足够的具有一定绝缘性能的工作液，当钼丝与工件的距离小到一定程度时，在脉冲电压的作用下，产生瞬时高温，使金属局部熔化甚至汽化而被蚀除下来。若工作台带动工件不断进给，就能切割出所需要的形状。它主要用于加工各种形状复杂和精密细小的工件，具有加工余量小、加工精度高、生产周期短、制造成本低等突出优点，已在生产中获得广泛的应用。47269
此次设计包括机床的总体布局设计，横向进给、纵向进给设计，其中还包括齿轮的强度计算，滚珠丝杠螺母副的较核。控制系统部分包括步进电机控制电路和脉冲电源，这是数控电火花加工机床的重点设计部分，也是难点。步进电机电路设计包括硬件电路设计和软件系统设计。脉冲电源电路采用高低压复式脉冲电源，它是由晶体管及分立元件组成的电路，输出高低压复式脉冲，可以同时供给两个放电间隙加工，提高生产效率。
毕业论文关键词：数控电火花线切割加工；主轴运动；步进电机；脉冲电源。
Abstract Electric spark line cutting processing is a wire electrode electrical discharge machining EDM for short, is a kind of. By cutting the workpiece as the workpiece electrode, molybdenum wire as tool electrodes, pulse power issued a series of pulse voltage applied to the electrode and workpiece, the tool electrode. Molybdenum wire and the workpiece exert enough with the insulating properties of the working fluid. When the molybdenum wire and workpiece distance is smaller than a certain value, the pulse voltage generated under the action of high temperature, instantaneous, so that the metal is partially melted even vaporization by etching down. If the worktable drives the workpiece is continuously fed, can cut into required shapes. It is mainly used for the processing of various complex shape and small precision parts, has a small machining allowance, high processing precision, short production cycle, low manufacturing cost advantages, has been widely used in production.
This design including the overall layout of the machine design, a transverse feed, longitudinal design, which also includes gear strength calculation. The control system includes stepping motor control circuit and a pulse power source, which is the numerical control electric spark machining machine tool key design part. Stepper motor circuit design including the hardware circuit design and software system design. Pulse power supply circuit using high voltage double pulse power supply, which is composed of a transistor and the output circuit composed of discrete components, high and low voltage double pulse, can feed two discharge clearance processing, improve the production efficiency.
Key words: numerical control electric spark line cutting processing;movement of the spindle; stepping motor;pulse power supply.
目 录 IX
第一章 总体方案拟定 1
1.1 线切割机床的国内现状 1
1.2 总体方案的拟定 2
1.3 机床的机构组成及其作用 3
1.3.1 机械系统 4
1.3.2 传动系统 7
1.3.3 机床润滑及工作液系统 8
第二章 机械系统及传动系统设计 9
2.1 工作台外形尺寸及重量计算：
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