Measuring method for critical electro-discharge machining gap

Abstract

The invention relates to a kind of method to measure the critical discharge process gap and belongs to field of special process technique. First touch the workpiece and the electrode at A, coordinate spot of which is X=Y=Z=0. The workpiece surface is parallel to XOZ. Drawback the electrode 1mm along axis Z to B, and then move it Delta X or -Delta X along axis X to C. Then move down the controlling box artificially at a least distance Delta t. The electrode processes at the point Z=1mm-Delta t away the workpiece surface, and arrives at point X=0 after moving Delta X. If discharge happens at this moment, the critical discharge gap is 1mm-Delta t. If not, move back the electrode to C and shorten the distance between the workpiece surface and the electrode at 2xDelta t, then take the above process again until discharge happen. If discharge happens after shorten the distance for N times, the critical discharge gap is 1mm-nxDelta t.

Description

technical field [0001] The invention relates to a method for measuring a critical discharge gap, in particular to a method for measuring a critical discharge machining gap. Used in the field of special processing technology. Background technique [0002] One of the important features of electrical discharge machining is that a certain distance must be kept between the electrode and the workpiece to ensure the smooth progress of electrical discharge machining. The critical discharge gap refers to the inter-electrode distance at which the medium between the positive and negative electrodes can just be broken down under a certain open voltage. Since the size of the critical discharge gap is related to the gasification explosion of the machining fluid, the removal channel of the machining chips, and even the characteristics of the EDM, on the other hand, it has a very important reference role in estimating the accuracy of EDM. Therefore, the critical breakdown value is often u...

AI Technical Summary

Problems solved by technology

However, this method can only be tested after designing a special manual gap adjustment device, and this test method has some points to be questioned in terms of test accuracy. , until it comes into contact with the workpiece surface, so as to measure the discharge gap, the biggest disadvantage is: a special manual gap adjustment device is required, and the test cost is high; when manual feed is used, the feed per unit time will not be large, which is very It may cause continuous pulse discharge after the discharge occurs at the critical discharge gap, and the critical discharge gap is mistakenly regarded as the discharge gap, so there is a principle error, and the test error is large

Images