Application of CNC Wire EDM in tool electrode machining

In the plastic mold, especially the dynamic and fixed mold, there are many tiny places where the tool could be more suitable for processing or a more complex surface shape. Then it is necessary to make the tool electrode using EDM processing. Tool electrode bitter with fine-shaped holes, narrow slits, and complex beveled type columns, type hole. The tool is not suitable for processing. It is necessary to use CNC Wire EDM machine tools for cutting and forming. Because the milling tool always has a radius r in the mold requiring sharp corners, the electrode often has to use CNC Wire EDM to clear the corners. The corner-clearing process takes full advantage of the small electrode fillet r and the large variable taper.

Remember to consider the spark bit used in electrode forming during the electrode cutting. Generally, there are two kinds of electrodes for coarse and fine electrodes, and the discharge spark bit is about 0.15mm and 0.05mm on one side, respectively; in extensive workpiece processing, three electrodes are also needed for coarse, medium, and refined, and the discharge spark bit is about 0.3mm, 0.15mm and 0.05mm on one side respectively.

In processing holes, the complementary value should be subtracted from the single-sided discharge spark bit, that is, the hole cutting significant bilateral two spark bits. For example, if a 10mm hole is machined, if the spark bit is 0.3mm on one side, the size of the machined hole is 10.6mm. When machining the shape, the correction value is subtracted from the unilateral discharge spark bit, which means that the electrode shape is cut bilaterally by two discharge spark bits. If machining a square column of 10mm*10mm, if the spark bit is 0.3mm, the size after machining is 9.4mm*9.4mm.