In fact, EDM machining is different from other equipment processing methods. EDM is processed by electrode discharge in some specific media to process the workpiece.
The workpiece is mainly eroded down by high temperature to achieve the effect. The following three points are It is related to electric spark.
1. Remove most of the material by machining
Performing electrical discharge machining, unlike the first method for rough machining, it is difficult or impossible for the finishing grinding tool to leave the material processing part of the workpiece before the finishing EDM part, so that the large EDM is reduced and the EDM efficiency can be greatly improved.
If you are afraid of work troubles, direct EDM without rough machining will lead to extremely low EDM efficiency, which requires a correct understanding of the processing speed of EDM. In EDM, the removal of material is carried out through a microthermal melting process, which is much slower than mechanical cutting. For large cavities, even if rough machining is performed, if too much EDM machining allowance is left, the machining efficiency will be reduced.
2. Determine the process method according to the processing situation
The single EDM electrode is directly formed in the process to replace the multi-electrode forming process. When choosing a process, not only the processing speed should be considered, but also the processing accuracy and surface roughness should be carefully considered. The single electrode shape of the cavity is directly formed by a process that only has the required electrodes. For example, for a simple machining shape, the cavity accuracy is not required to be high, and repeated clamping operations are not required to directly form the spark processing efficiency. Sometimes, it is usually a higher processing requirement for a multi-stage process to process electrodes. First of all, rough machining, finishing and finishing a large amount of material with the electrode to ablate the electrode, and also consider the loss to compensate for switching to the electrode for finishing the multiple electrodes.
For example, in occasions that require high machining accuracy, only one electrode is used for machining. Due to the lack of understanding of the machining process, we hope to improve the machining efficiency by reducing the number of electrodes. However, in the actual machining process, because of rough machining, large electrical parameters cannot be selected, and the machining efficiency is extremely low. In another case, when the processing requirements are not high, multi-electrode processing is used, and the processing efficiency will inevitably decrease.
3. Reasonable selection of electrode materials
The selected electrode material is directly related to the discharge effect. To a large extent, the selection of the material determines the discharge speed, the final condition accuracy of the EDM and the surface roughness. The selection of electrode materials should be based on the actual needs of different types of mold processing. Copper and graphite electrodes are commonly used in EDM electrodes. Many mold companies rarely consider the size of electrodes used to select all the same electrode materials in the selection of electrode materials. This practice will affect the efficiency of EDM machining.
