CNC Machining Services

How do we understand EDM？

Electric discharge machining (EDM) is a new process that uses electric energy and heat energy for processing, commonly known as discharge machining. The difference between EDM and general cutting is that the tool and the workpiece are not in contact during EDM, but rely on the pulsed spark discharge continuously generated between the tool and the workpiece, and use the local and instantaneous high temperature generated during discharge to gradually erode the metal material.

The main characteristics of electric discharge machining

1. Able to process materials and complex shaped workpieces that are difficult to cut with ordinary cutting methods;

2. No cutting force during machining;

3. Do not produce defects such as burrs and knife marks and grooves;

4. The tool electrode material does not need to be harder than the workpiece material;

5. Directly using electrical energy processing for easy automation;

6. The surface undergoes a metamorphic layer after processing, which needs to be further removed in certain applications;

7. The purification of working fluids and the treatment of smoke pollution generated during processing are quite troublesome.

What can it do?

1. Processing molds and parts with complex shaped holes and cavities; 2. Processing various hard and brittle materials such as hard alloys and quenched steel; 3. Processing deep and fine holes, irregular holes, deep grooves, narrow seams, and cutting thin sheets; 4. Process various forming tools, templates, thread ring gauges, and other tools and measuring tools.

Usually It Can Be Done With Accuracy

The dimensional accuracy of the perforation depends on the size of the tool electrode and the gap of the spark discharge to ensure that the cross-section profile size of the electrode is evenly reduced by a processing gap than the size of the predefined machining hole, the dimensional accuracy is one level higher than the workpiece, generally not less than IT7 level, and the surface roughness value is smaller than the workpiece. The straightness, flatness and parallelism are not greater than 0.01mm on the length of 100 mm.

Application Area

Electric discharge machining is mainly used for machining holes and cavities in mold production, and has become the leading processing method in the mold manufacturing industry, promoting technological progress in the mold industry. When the number of EDM parts is less than 3000, it is more economically reasonable than die stamped parts.

According to the characteristics and purposes of the relative motion between tools and workpieces during the process, electric discharge machining can be roughly divided into: electric discharge forming machining, electric discharge wire cutting machining, electric discharge grinding machining, electric discharge generative machining, non-metallic electric discharge machining, and electric discharge surface strengthening.

EDM Forming

This method involves copying the shape and size of the workpiece electrode onto the workpiece through the feed motion of the tool electrode relative to the workpiece, thereby producing the required parts.

Electric discharge wire cutting machining:

This method uses moving fine metal wires as tool electrodes to perform pulse discharge cutting according to a predetermined trajectory. According to the speed of metal wire electrode movement, it can be divided into high-speed wire cutting and low-speed wire cutting.