EDM characteristics 电火花加工特性

1: EDM speed and surface quality
Die in the EDM machine will generally use coarse, medium and fine sub-file processing. Roughing adopts high-power and low-loss realization, but the relative loss of medium and fine machining electrodes is large, but in general, the medium and finishing machining margin is less, so the electrode loss is also extremely small, and can be compensated by processing size control, or It is ignored when it does not affect the accuracy requirement.

2: Electric spark carbon residue and slag discharge
EDM machining can be carried out smoothly under the conditions that produce carbon slag and eliminate the balance of carbon slag. In practice, carbon slag is often excluded at the expense of processing speeds. For example, high voltages are used in medium and fine processing, and pulse waves are largely stopped. Another reason to exclude the carbon slag is that the shape of the processing surface is complex and the path of the chip is not smooth. Only positively create a good condition for exclusion, take some measures to deal with the disease.

3: EDM workpiece and electrode loss
EDM pulse discharge pulse for a long time, help to reduce the electrode loss. Electric discharge machine roughing generally uses long discharge pulse wave and large current discharge, and the processing speed is fast. The electrode loss is small. In the finishing process, the small-current discharge must reduce the discharge pulse time, which not only increases the electrode loss, but also greatly reduces the processing speed.

EDM is a completely different new process from machining. With the development of industrial production and the advancement of science and technology, new materials with high melting point, high hardness, high strength, high brittleness, high viscosity and high purity continue to emerge. There are more and more workpieces with various complex structures and special process requirements, which makes conventional machining methods impossible or difficult to process. Therefore, in addition to further development and improvement of mechanical processing methods, people are also striving to find new processing methods. EDM can adapt to the needs of production development, and shows a lot of excellent performance in applications, therefore, has been rapidly developed and increasingly widely used.