Modern mold factories cannot lack electric machining. Electric machining can process all kinds of special-shaped and high-hardness parts. It is divided into two types: wire cutting and electric spark.

The machining accuracy of slow-moving wire cutting can reach ±0.003mm, and the roughness is Ra0.2μm. When the processing starts, check the condition of the machine tool, check the deionization degree of the water, the water temperature, the perpendicularity of the silk, the tension and other factors to ensure a good processing state. Wire-cutting processing is to remove processing on a whole piece of material, it destroys the original stress balance of the workpiece, it is easy to cause stress concentration, especially at the corners, so when R<0.2 (especially sharp corners), you should The design department makes suggestions for improvement. The method to deal with stress concentration in processing can use the principle of vector translation. Before finishing, leave a margin of about 1mm, pre-process the rough shape, and then perform heat treatment to release the processing stress before finishing to ensure thermal stability.

When processing the core, the cutting position and path of the wire should be carefully considered. Using punching and threading processing, the effect is better. High-precision wire-cutting processing, usually the number of cutting passes is four, which can guarantee the quality of the parts. When processing taper dies, in a fast and efficient position, rough machining straight edges once, taper machining a second time, and then finishing straight edges, so that X-segment vertical finishing is not required, only finishing The straight edge of the cutting edge section saves time and cost.

EDM must first make electrodes, and electrodes can be coarse and fine. The precision machining electrode requires good shape conformity, and it is better to be processed by CNC machine tools. In terms of electrode material selection, copper electrodes are mainly used for general steel processing. The Cu-W alloy electrode has good overall performance, especially the consumption during processing is obviously smaller than that of copper. With a sufficient amount of scouring fluid, it is very suitable for the processing of difficult-to-process materials and the finishing of parts with complex cross-sectional shapes. When making electrodes, it is necessary to calculate the amount of electrode gap and the number of electrodes. When processing large areas or heavy electrodes, the workpiece and electrode should be clamped firmly to ensure sufficient strength to prevent processing looseness. When performing deep step processing, pay attention to the wear of the electrode and the arc discharge caused by poor drainage.