EDM was invented by the former Soviet scholar Lazarenko in 1943, and then developed rapidly with the improvement of pulse power and control systems. Tool electrodes are commonly used to resist electro-erosion materials such as copper, graphite, copper-tungsten alloys and molybdenum, which have good electrical conductivity, high melting point and easy processing. During the machining process, the tool electrode also has losses, but less than the amount of metal removed from the workpiece, even close to no loss. CNC high-speed machining is an advanced manufacturing technology that combines high efficiency, high quality and low cost. It has the advantages of high efficiency, high precision and high surface quality. It is widely used in mold manufacturing and can replace partial grinding in some cases. Processing and EDM. However, high-speed milling must meet the requirements of no interference, no collision, smoothness, smooth cutting load, etc. during machining, and the spindle is easy to wear and cost during the machining process. These characteristics also determine that high-speed milling can not completely replace EDM. High-speed milling and EDM have their own space High-speed milling has something in common with CNC EDM, and it belongs to the removal processing method. In some cases, it is possible to replace each other, but both have their own advantages, and it is impossible to completely replace each other. From the perspective of the workpiece structure, for the open mold structure, high-speed milling and CNC EDM can be replaced by each other in terms of processing capability, and for deep cavity, groove, and blade-shaped integrated turbine disk blades. Due to the limitation of the structure, high-speed milling can not complete the machining at all, and the CNC EDM has good flexibility, and it can easily complete the processing of various complex structures by using its multi-axis linkage function. From the perspective of machining accuracy, with the development of numerical control technology, the two are basically the same, but with the same precision, the machining efficiency of CNC electric spark is obviously lower than that of high-speed milling. If the machining efficiency is not considered, as long as the workpiece structure can be processed by high-speed milling, the numerical control electric spark can replace the machining; on the contrary, as mentioned above, the structure of the numerical control electric spark machining can not replace the machining for high-speed milling. From the perspective of processed materials, the machining characteristics of high-speed milling determine the requirements for tool materials, tool structures, tool clamping, and spindles, machine structures, feed drives, and CNC systems. High-speed milling for high-hardness materials for tools The requirements are also relatively high, and EDM is mainly used to machine molds and parts with complex shapes of holes and cavities; processing deep holes, shaped holes, deep grooves, slits and cutting sheets, and processing various forming tools Tools, gauges, etc., such as prototypes and thread ring gauges, have no requirements for material hardness. The same high-hardness material, for high-speed milling, the higher the hardness, the higher the requirements for the tool, the higher the cost; for the electric spark, the change in hardness has little effect on the machining. From the processing speed point of view, for the current material, high-speed milling is obviously superior to EDM, but for high-hardness and difficult-to-machine materials, the tool cost for high-speed milling will become geometric with the increase of hardness. The growth of the number, and for the numerical control EDM, the cost change is little or basically no change, so from the perspective of processing cost, CNC EDM should be superior. In terms of process selection, in the case of achieving the same processing accuracy, a low cost processing method should be preferred. Unless the processing requirements or general processing are not possible, the general processing method can not be achieved by the general processing method. Gearbox/Screw Elements/Screw Barrel Parts Zhoushan Jinsheng Bimetallic Plastic Machinery Factory , https://www.jinshenggalloy.com
Zhang Kun, Director of Special Processing Center of Capital Aerospace Machinery Co., Ltd.