The EDM cutting process

The EDM cutting process

The EDM cutting process is a commonly used non-traditional cutting method, which is usually used for cutting hard materials with low electrical conductivity, such as carbide, ceramics, quartz, etc. It uses the principle of electric spark discharge to generate electric spark on the surface of the workpiece for cutting. This process has unique advantages and disadvantages, which are described in detail below.




High-precision cutting: EDM cutting has a high cutting accuracy, can achieve fine cutting of the workpiece, cutting surface flat, cutting size accurate.


Wide range of application: EDM cutting is suitable for a variety of hardness materials, including metal, ceramics, quartz, etc., has a strong versatility.


Controlled cutting depth: EDM cutting can achieve accurate control of cutting depth by adjusting discharge parameters, such as discharge current, pulse interval, etc., which is suitable for scenarios where cutting depth is required.


No heat affected zone: EDM cutting is a cold processing method, the cutting process does not produce a heat affected zone, will not lead to the deformation of the workpiece, hardening and other problems, to maintain the original performance of the workpiece material.


Non-contact cutting: EDM cutting is a non-contact cutting process that will not cause damage to the surface of the workpiece and maintain the integrity of the surface of the workpiece.


Fast cutting speed: EDM cutting can achieve a faster cutting speed, especially suitable for cutting materials with higher hardness.


Smooth cutting surface: The cutting surface of EDM cutting is smooth, less burrs, and no subsequent surface treatment is required, saving processing processes and costs.

Sheet metal cutting methods 



High equipment cost: The investment cost of EDM cutting equipment is high, and the maintenance and operation cost is also high, which has certain requirements for the capital investment of manufacturers.


Slow cutting speed: Compared with traditional cutting methods, the cutting speed of EDM cutting is slow, especially for large area cutting needs, and the efficiency is low.


Not suitable for conductive materials: EDM cutting is mainly used for cutting hard materials with low conductivity, and is not suitable for the cutting needs of conductive materials.


High requirements for discharge parameters: EDM cutting operators need to have a high technical level and operating experience, proficient in the adjustment of discharge parameters and equipment operation skills to ensure cutting quality and safety.


Limited cutting depth: EDM cutting has certain restrictions on the cutting depth, and is not suitable for scenarios with high cutting depth requirements.


High requirements for the shape of the workpiece: EDM cutting has higher requirements for the shape of the workpiece, and is not suitable for cutting the workpiece with complex shapes.


High technical requirements: EDM cutting operators need to have a high technical level and operational experience, skilled in equipment operation and process parameter adjustment, to ensure cutting quality and safety.


To sum up, the EDM cutting process has the advantages of high precision and wide application range, but it also has the disadvantages of high equipment cost and slow cutting speed, which need to be considered comprehensively in practical applications to choose the appropriate cutting method to meet the processing needs of products.