Measurement method of electro discharge machining gapping place

Abstract

The invention relates to a measuring method for discharge machining gap in special machining technology field. The steps are as follows: an electrode and a workpiece are contact-sensed alone Z axis using the contact-sensing function of the machine tool, and the point is set to a base point. After the electrode moves along the direction of X or Y axis, the electrode and the workpiece surface are contact-sensed again, and the coordinate difference value of the base point relative to the contact point is recorded, and the coordinate of the point is set to zero; the machining is carried out along Z axis, and when the machining is over, the electricity is forbidden to cut off, and the electrode is stopped at the discharge position, and the machining depth of the electrode at the moment is recorded; after the electrode and workpiece surface are washed directly, the electrode is fallen down along the direction of Z axis to the position contacted with the machining surface to measure the virtual machining depth in the direction of Z axis; the electrode is moved again to the coordinate position of the base point to be contact-sensed with the base point, and the difference between the coordinate value of Z axis at the moment and the formerly recorded coordinate value of the base point is recorded, and the loss of the electrode after machining is measured, and then the discharge machining gap can be achieved. The method is simple, easy to apply, reliable and accurate.

Description

technical field [0001] The invention relates to a measuring method in the technical field of special processing, in particular to a measuring method for an electric discharge machining gap. Background technique [0002] The discharge machining gap refers to the discharge machining distance between the electrode and the workpiece when the electrode is used to process the workpiece in order to meet a certain set average processing voltage. The inter-electrode distance value is directly related to the dielectric properties of the inter-electrode medium, that is, it is related to the processing debris contained in the inter-electrode medium, the conductivity of the particles, and the particle concentration and distribution. When there are many particles and the insulation is poor, the discharge gap distance will be large, otherwise the insulation is good and the gap distance will be small. Since the discharge machining gap is very small, generally between a few microns and hund...

AI Technical Summary

Problems solved by technology

The single-shot discharge state is quite different from the actual EDM state, which is mainly manifested in the different state of the medium between electrodes. The medium of the former is clean kerosene, which has good insulation; the medium of the latter is kerosene and processing shavings particles, etc. The mixture is mainly composed of processing shavings, air bubbles, colloidal medium, etc., so the insulation is poor

Since the inter-electrode insulation directly affects the size of the gap, there is a certain deviation between the inter-electrode distance value obtained by using this measurement method and the value measured in the actual EDM state, which does not reflect the actual machining gap and needs further improvement

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