Many micro-holes or parts with peculiar shapes cannot be processed on other machine tools. They have to be completed by wire-cutting machines. When the accuracy is high, slow-moving wire is required. Therefore, slow-moving wire is suitable for small precision Metal processing is of great significance. The selection of electrode wire diameter needs a comprehensive consideration, mainly from the two aspects of processing efficiency and processing accuracy.

The filament cost is low, but the smaller concave corner radius of the processed workpiece is relatively small, but because of its limited strength, the tension cannot be adjusted too much, so the lag of the electrode wire during processing is relatively large, which affects the precision of precision hardware processing. The processing filament has relatively weak ability to withstand current density, and its processing efficiency is also limited to a certain extent. The finer electrode wire can withstand greater tension and current density, so higher machining accuracy and processing efficiency can be obtained, but it is more The radius of the small concave angle is relatively large, and the electrode wire material consumption is also greatly increased, which will increase the operating cost. Therefore, after considering the efficiency and accuracy of the selection of the electrode wire diameter, it is also necessary to make a decision based on the requirement of a smaller concave angle of the workpiece.

In precision metal processing. The processing wire has a relatively weak ability to withstand current density, and the processing efficiency is also limited to a certain extent. In the process of finer electrode wires that can withstand greater tension and current density, in order to control costs, it is often necessary to reduce the wire transport speed. However, if the wire transport speed is too low, the loss rate of the electrode wire in the entire discharge path is greater than the refilling speed of the new wire, which will cause a large processing gap at the upper end and a small processing gap at the lower end, resulting in a difference. The greater the processing current, the difference will be The larger the size, the worse the precision of precision hardware processing, and the longer the electrode wire stays in the discharge path, the more the electrode wire wears, and the greater the heat per unit length, the more likely it is to break the wire. According to the size of the processing current, select the appropriate wire transport speed.

CNC machine tools, CNC lathes, turning and milling machine tools