The WEDM process is affected by many factors

The WEDM process blurs the gap state. The WEDM process is affected by many factors and has obvious nonlinearity and randomness. It is difficult to describe with accurate mathematical models. In order to enhance the stability of the processing process, improve the cutting processing efficiency and surface quality, and prevent the wire from being blown, the wire electric discharge machine should have a fully functional control system. From a control point of view, the key technology of the high-speed wire cutting machine control system is the control of the gap state. The best way to solve this problem is to rely on the intelligent control technology developed in recent decades. Fuzzy control does not require the precise mathematical model of the controlled object, which is suitable for nonlinear time-varying occasions. For this reason, the author has developed a gap state fuzzy control system.

Characteristics of EDM wire cutting processing At present, the gap control system of most high-speed wire EDM wire cutting machines used in China is a frequency conversion feedback control system that uses the average gap voltage as the control parameter. The system structure is simple and easy to implement. Since the high-speed wire EDM wire cutting machine does not have obvious arcing phenomenon, there are three states of the cutting machining gap: no-load, normal electric discharge machining and short circuit. The gap state is the control object of the control system, and refers to the statistical result of the above various states over a period of time. The feed control system determines the feed, retreat or maintain the status quo according to the proportion of the various discharge states in the gap state (ie, within a certain period of time). The gap state has a natural feedback effect on the processing speed. This natural feedback is non-monotonic, and the processing speed is reduced regardless of whether the gap is too large or too small. The machining speed and feed rate have an important influence on the clearance state. When the two values ​​are equal, the gap state is maintained constant, and in an ideal state without interference effects, the statistical values ​​of the various discharge states are substantially constant. The adjustment effect of the feed motion on the gap is indirect, which is realized by the tension change of the wire. The actual feed amount is not equal to the gap variation, and the actual erosion amount is not equal to the gap variation, but they are different from the gap variation. There is a certain correspondence between the actual, and the actual amount of erosion is equivalent to the actual feed rate under normal processing conditions.

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