Precision EDM technology of high value-added mold


In recent years, the mold industry has developed substa […]

In recent years, the mold industry has developed substantially, and the requirements for mold accuracy have become higher and higher. High value-added molds such as miniature connectors, IC plastic molds, LED molds, etc. have become very popular mold varieties on the market. Although the technology of high-speed milling for micro-molding of molds is constantly improving, the use of electrical discharge machining for the fine parts of high-value-added mold parts has always occupied the main position in processing.

The core of precision electric discharge machining is mainly reflected in the requirements of dimensional accuracy, profiling accuracy, and surface quality. The processing size should be strictly jointed, and the requirements can reach ±2–3μm. The accuracy of profiling requires clear edges and corners. The R value of the corners of the bottom surface should be as small as possible (generally R value is less than 0.03mm). The depth error from the edge part to the center part of the flatness is within 2μm. The surface quality requires uniform surface roughness, Ra should be less than 0.4μm, most of the processing parts require mirror processing, and no polishing treatment will be performed after processing.

There are many factors that affect the accuracy of EDM. In the EDM mechanism, there are discharge gaps in the discharge process, electrode losses are inevitable, and the chip removal effect in finishing is poor. These are the problems that directly plague the precision control of precision EDM. In actual processing, processing Accuracy is affected by multiple links. Only by mastering the essence of processing technology, strictly controlling all links in processing, and continuously accumulating processing experience can we ensure a high success rate. Starting from the actual processing experience, the following points are introduced to the precision EDM technology.

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