EDM is the abbreviation of the English word Electrical DischargeMachining, that is, using continuous moving thin metal wires (called electrode wires) to conduct pulsed spark Discharge to remove metal and cut the workpiece into shape.
It is mainly used for a variety of complex shape and small precision workpieces, such as the punch die, die, intensive, fixed plate, stripper plate, such as forming tool, template, use of electric spark machine-shaping metal electrodes, all kinds of micro hole trough, narrow gap, curve and so on, with a small machining allowance, high machining accuracy, short production cycle, low manufacturing cost advantages, has obtained widespread application in the production, the wire-cutEDM machine at home and abroad has more than 60% of the total number of electric machine.
EDM process in the mold manufacturing industry position is unbreakable, most of the mold manufacturing is inseparable from it, its key advantage is that can process any hardness of materials, and can produce complex, thin outline. The more attractive advantage of EDM is that it can be automated with high accuracy and few failures.
EDM is the principle of etching the material on the surface of the workpiece layer by layer by means of the instantaneous high temperature generated when the spark between the electrode and the workpiece is energized.EDM is suitable for machining high hardness conductive workpiece. CNCEDM machine is the best example ofEDM. EDM processing characteristics.
Discharge machining (EDM) is a copy molding process in which materials are removed by a short, continuous discharge in an insulating solution. Hydrocarbons are standard insulators, and substances containing soluble organic acids may also be used as a water medium. The tool electrode is generally machined into the shape of the mold to replicate the mold profile. Under a continuous discharge shock, the material on the workpiece and electrode is heated to the melting or gasification temperature and bursts under the action of electronic or mechanical forces. Through the reasonable selection of process parameters, the material removal amount on the workpiece is much more than that on the electrode, even reaching or exceeding 1000:1.
In general, if the conductive material shows good thermal conductivity, then, can be used as an electrode. In most cases, the melting point of these materials can be high enough to prevent rapid wear of the tool electrode. Today, graphite and copper electrodes are used in steel, while copper-tungsten electrodes are used in hard metals.
