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What is characteristics of EDM Electrical discharge machining
EDM has the following characteristics: it can process any conductive materials with high strength, high hardness, high toughness, high brittleness and high purity; there is no obvious mechanical force during processing, and it is suitable for processing low-rigidity workpieces and microstructures: pulse parameters can be based on Need to adjust, roughing, semi-finishing and finishing can be performed on the same machine tool; the pits on the surface after EDM are conducive to oil storage and noise reduction; the production efficiency is lower than that of cutting; the discharge process is partially Energy is dissipated on the tool electrode, which leads to electrode wear and affects the forming accuracy.
EDM has the following characteristics:
1. The energy density of pulse discharge is high, which is convenient for processing special materials and workpieces with complex shapes that are difficult or impossible to process with ordinary machining methods. Not affected by material hardness, not affected by heat treatment conditions.
2. The duration of pulse discharge is extremely short, the heat conduction and diffusion range generated during discharge is small, and the material affected by heat is small.
3. During processing, the tool electrode does not contact the workpiece material, and the macroscopic force between the two is extremely small. The tool electrode material does not need to be harder than the workpiece material, so the tool electrode is easy to manufacture.
4. It can reform the structure of workpiece, simplify the processing technology, improve the service life of workpiece, and reduce the labor intensity of workers.
To implement EDM must meet three conditions: pulse power supply must be used; automatic feed adjustment device must be used to maintain a small discharge gap between tool electrode and workpiece electrode; spark discharge must have a certain dielectric strength (10 ~ 107Ω m ) in a liquid medium.