数控线切割机床由机械、电气和工作液系统三大部分组成。
CNC wire cutting machine is composed of three parts: machinery, electrical and working fluid system.
（1）线切割——数控电火花线切割加工的简称。
(1) wire cutting -- short for CNC WEDM.
（2）工作原理：利用移动的金属丝作工具电极，并在金属丝和工件间通以脉冲电流，利用脉冲放电的腐蚀作用对工件进行切割加工的。
(2) Working principle: using moving wire as tool electrode, and pulse current between wire and workpiece, cutting workpiece by pulse discharge corrosion.
（3）由于它利用的是丝电极，因此，只能作轮廓切割加工。
(3) because it uses a wire electrode, it can only be used for contour cutting.
线切割加工的优势
Advantages of WEDM
1.加工时工件无受力变形，在数控指令控制下，加工精度高，
1. when the workpiece is processed, the workpiece is free from force and deformation. Under the control of NC instruction, the machining accuracy is high.
2.生产周期短
2. short production cycle
3.加工余量小,能有效地节约贵重的材料。
3. the machining allowance is small, which can effectively save valuable materials.
4.制造成本低,电火花线切割加工工具电极简单，加工不同模数链轮同一规格丝线即可完成。
4. The manufacturing cost is low, the tool electrode of WEDM is simple, and the machining of different modulus sprocket with the same specification can be completed.
5.低能耗、无污染。
5. low energy consumption and no pollution.
6.表面损伤层浅，晶片表面粗糙度小
6. the surface damage is shallow, and the surface roughness of the wafer is small.
7.依靠微型计算机控制电极丝轨迹和间隙补偿功能，可加工异形体，形状扭曲曲面体，变锥度和球形等零件。
7. By means of microcomputer control of electrode wire trajectory and clearance compensation function, special-shaped body, shape twisted surface body, taper and spherical parts can be machined.