A Study of Electroerosive Machinability of Heat-Resistant Alloys in Relation to the Technology of Piercing Small Diameter Holes

This article presents a method of obtaining and analyzing a single electroerosion hole for a group of heat-resistant chromium-nickel alloys. The study of the geometric parameters of the hole allows us to calculate experimentally the coefficient of erosion of the workpiece material, which characterizes the efficiency of converting the electrical energy into the fracture work of a solid body. When a single erosion pulse is applied to the interelectrode gap, a single hole is formed on the electrode surface. The geometric parameters of the hole (diameter, depth, height of the collar) depend on many factors: the pulse energy, the composition of the working fluid, the material of the electrodes, the value of the interelectrode gap, etc. This study establishes the dependence of the volume of the removed material on the pulse energy, with other conditions being equal. Experimental studies are conducted in accordance with a well-known method, and photographs of individual holes are obtained for different pulse durations. Ball segment and ellipsoid models are proposed for calculating the volume of the removed metal. It is shown that the ball segment model yields the smallest calculation error. The volume of individual holes is calculated using the selected ball segment model.

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