What is the working principle of EDM?

The working principle of EDM is: it is mainly used to process holes and cavities in mold production, and has become the dominant processing method in mold manufacturing industry, which has promoted the technological progress of mold industry.

EDM 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 in the machining process, which is suitable for machining low-stiffness workpieces and microstructures.

Pulse parameters can be adjusted as required, and rough machining, semi-finish machining and finish machining can be carried out on the same machine tool; The pits on the surface after EDM are beneficial to oil storage and noise reduction; The production efficiency is lower than that of cutting; In the process of discharge, some energy is consumed on the tool electrode, which leads to electrode loss and affects the forming accuracy.

EDM description:

EDM can process materials and complex workpieces that are difficult to cut by ordinary cutting methods. No cutting force during machining; No burr, knife marks, grooves and other defects; The tool electrode material need not be harder than the workpiece material; Direct use of electric energy processing, easy to achieve automation; After processing, the surface produces a metamorphic layer, which must be further removed in some applications; It is very troublesome to purify the working fluid and treat the smoke pollution produced in the process.

EDM is mainly used to process molds and parts with complex shapes and cavities. Processing all kinds of hard and brittle materials, such as cemented carbide and hardened steel; Machining deep fine holes, special-shaped holes, deep grooves, slits and slices; Processing tools and measuring tools such as various molding tools, templates and thread ring gauges.