Electric discharge machining method and system for changing end part shape of tool electrode

Abstract

The invention discloses an electric discharge machining method and system for changing the end part shape of a tool electrode. The method comprises the steps that a tool electrode with preset end partshape is prepared through an online method or an offline method; a liquid flushing effect observation experiment is carried out on the tool electrode with the preset end part shape, the shape of splashed water spots is observed, and the preset end part shape and liquid flushing parameters are optimized according to the shape of the water spots; a discharge experiment is carried out by utilizing the optimized liquid flushing parameters and the tool electrode with the optimized preset end part shape, the discharge phenomenon of the tool electrode with the optimized preset end part shape is observed, and process parameters are optimized according to the discharge phenomenon; and electric arc milling machining is carried out by adopting the optimized process parameters and the tool electrodewith the optimized preset end part shape. The method is an electric discharge machining process capable of improving the liquid flushing effect, promoting chip removal, reducing the relative electrodeloss rate and improving the machining quality by changing the end part shape of the tool electrode.

Description

technical field [0001] The invention relates to the technical field of special machining, in particular to an electric discharge machining method and system for changing the shape of a tool electrode end. Background technique [0002] EDM refers to a special processing technology for processing workpieces through the electric erosion effect of pulse discharge between tool electrodes and workpiece electrodes in a certain medium. Since EDM is processed by electricity and heat, it is not limited by the strength and hardness of the material, and is widely used in the processing of various molds, difficult-to-machine materials, complex shapes, and some special or extremely demanding parts. [0003] If the electro-corrosion products generated during EDM cannot be discharged from the machining gap in time, they will accumulate on the machining surface and cause secondary discharge, which not only affects the stability of machining, but also causes problems such as ablation of the E...

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Problems solved by technology

However, due to the high energy in the processing process, the flushing effect is not good, resulting in high surface roughness of the processed surface, and the shape of the tool electrode is a common cylindrical shape. In the milling process, the bottom is constantly worn, and the electrode loss is very serious. To ensure the processing accuracy, especially when processing a groove with a certain length, the bottom of the processed groove will be inclined, that is, the depth of the end of the groove is smaller than the depth of the initial processing end; in addition, as the tool electrode continues to wear, and the angle of inclination of the machined groove side walls is also increasing

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