What are the characteristics of electrical discharge machining
Release time:
2022-12-08
Electrical discharge machining has the following characteristics: it can process any conductive material with high strength, high hardness, high toughness, high brittleness, and high purity; There is no obvious mechanical force during the processing, making it suitable for processing low stiffness workpieces and microstructures: pulse parameters can be adjusted as needed, and rough machining, semi precision machining, and precision machining can be carried out on the same machine tool; The surface pits after electrical discharge machining are beneficial for oil storage and noise reduction; Production efficiency is lower than cutting; The discharge process involves partial energy dissipation on the tool electrode, leading to electrode wear and affecting the forming accuracy.
EDM has the following characteristics:
1. Pulse discharge has a high energy density, making it easy to process special materials and workpieces with complex shapes that are difficult or impossible to process using ordinary processing methods. Not affected by material hardness or heat treatment conditions.
2. The duration of pulse discharge is extremely short, and the range of heat conduction and diffusion generated during the discharge process is small, and the material affected by heat is relatively small.
During the machining process, the tool electrode does not come into contact with 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. The structure of the workpiece can be modified, the processing technology can be simplified, the service life of the workpiece can be improved, and the labor intensity of workers can be reduced.
EDM conditions
The implementation of electrical discharge machining must meet three conditions: a pulse power supply must be used; An automatic feed adjustment device must be used to maintain a small discharge gap between the tool electrode and the workpiece electrode; Spark discharge in liquid media must have a certain dielectric strength (10-107 Ω m).
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