According to the different control forms of electrode wire motion trajectory, WEDM machine tools can be divided into three types
One is the imitation shape control. Before WEDM, the mold with the same shape as the workpiece is manufactured in advance. During the processing, the workpiece blank and the * die are clamped on the machine tool workbench. During the cutting process, the electrode wire closely adheres to the edge of the * die for trajectory movement, so as to cut the workpiece with the same shape and accuracy as the * mold;
The other is photoelectric tracking control. Before WEDM processing, a photoelectric tracking diagram is drawn according to the part drawing according to a certain magnification ratio. During processing, the drawing is placed on the photoelectric tracking table of the machine tool, and the photoelectric head on the tracking table always follows the trajectory of the ink line figure. Then, with the help of the linkage of electrical and mechanical, the machine tool workbench and workpiece relative electrode wire are controlled Make similar shape movement, so as to cut the workpiece with the same shape as the pattern;
The other is digital program control, which uses advanced digital automatic control technology to drive the machine tool to automatically complete the processing according to the number of NC machining programs prepared in advance according to the geometric shape of the workpiece before processing. There is no need to make * pattern boards or draw enlarged drawings. It has higher machining accuracy and wider application range than the previous two control forms. At present, more than 95% of them are at home and abroad The WEDM machine tools have been CNC.
