Mirror EDM, mirror EDM is mainly used in the precision machining of complex mold cavity, especially the complex curved surface which is not convenient for polishing. It can save the manual polishing process, improve the performance of parts, and shorten the mold manufacturing cycle. Very important practical significance.
After the conductive fine powder enters the discharge gap, it is equivalent to inserting multiple small conductors between the two poles, and also distorts the electric field in the discharge gap, which reduces the resistance to breakdown of the insulating medium in the gap, and discharge easily occurs, and the discharge gap increases accordingly. . The increased discharge gap reduces the initiation effect of the electric corrosion products on the discharge, and is conducive to the flow and discharge of the electric corrosion products, thereby reducing the occurrence of concentrated discharge and making the discharge evenly distributed on the processing surface. The discharge gap increases and the discharge channel becomes thicker. Under the same discharge pulse energy, the heated area of the workpiece surface increases and the heated intensity decreases, thereby forming large and shallow discharge pits on the surface of the workpiece. At the same time, the increase of the discharge gap also reduces the discharge ability of the molten metal to the discharge, allowing more molten metal to re-solidify on the surface of the workpiece, further reducing the depth of the discharge pit. Therefore, powder-mixed EDM forms large and shallow discharge pits on the surface of the workpiece.
Powder mixed Electrical Discharge Machining forms large and shallow discharge pits on the surface of the workpiece and the uniform distribution of discharge pits is the fundamental reason for reducing the roughness of the processed surface
