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EDMing Chronology December 29, 2012

Posted by viboon in : Manufacturing technologies , trackback

The following sequence illustrates the basic EDM pulse cycle of a complete ionization and discharge:

1. Ionization. High-voltage pulse forms discharge channel in dielectric fluid.

2. Discharge. The voltage decreases and current flows through the discharge channel, where the workpiece is melted at contact point and
hydrogen gas bubbles are generated.

3. Resting cycle. Low-voltage current is shut off, the gas bubble implodes, the molten material globule is cooled by dielectric fluid, and instantaneous cooling fractures a chip that the dielectric flushes away.

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