Method of measuring critical discharging gap

Abstract

The invention relates to a method for measuring critical discharge gap, which pertains to a technical field of electrical discharge machining. First, a workpiece plane and XOY are kept in parallel and clamped; an electrode contacts the workpiece at a point A for perception and a coordinate position of the contact A point is then set as zero; then, the electrode is returned to a B point of the coordinate position with a distance of Lmm along axial Z; the processing program is started up and a smallest distance Delta Zmm is processed downwards from the point B by using a discharge processing machine along the direction of a Z axis; after the processing, the electrode automatically returns to the point B; at the moment, whether a discharging trace exists or not is observed at the point A; if the discharging trace exists, the distance between the electrodes and the workpiece surface (Z=Lmm-Delta Zmm) is the critical discharge gap; if the discharging trace does not exist, the processing distance can be set as 2*Delta Zmm and the posterior processing is repeated. In the invention, the measuring time is greatly shortened; no workpiece form and position errors exist in measuring result; beside, the invention has the advantages of high measuring precision, convenient observation and operation, small measurement failure, simple and reliable operation.

Description

technical field [0001] The invention relates to a measuring method in the technical field of electric discharge machining, in particular to a measuring method for a critical discharge gap. Background technique [0002] The critical discharge gap refers to the inter-electrode distance at which the processing medium between the electrodes can just be broken down under the condition of applying a certain voltage between the positive and negative electrodes. Since the size of the critical discharge gap is related to the discharge range of EDM, the gasification explosion of the processing medium, the removal channel of the processing chips, the characteristics of EDM, and the estimation of the accuracy of EDM, it has a very important reference role, so The critical discharge gap value is often used in the research of EDM and the design of the servo system of EDM machine tools. Therefore, the low-cost, high-efficiency, high-precision, simple, convenient and reliable critical disc...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. The electrode needs to manually drop Δt multiple times and move horizontally along the workpiece surface multiple times (the distance is generally more than several millimeters), which results in time-consuming and labor-intensive testing and auxiliary testing; 2. Due to the size of the discharge mark Very small (usually a few microns to tens of microns), it is very laborious to carefully observe whether there are discharge marks along the processing path of the workpiece surface; 3 Due to the manufacturing and installation of the workpiece, there is a straightness error on the surface along the processing path, The test results contain shape and position errors, so the test accuracy is not high; 4. In the process of manual control, the shorter the descent distance, the more difficult it is to control, so the descent control is difficult

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