A method of electric discharge milling machining turbine blade expansion hole

Abstract

The invention discloses a method for electric discharge milling to process expansion holes of turbine blades, comprising: presetting the three-dimensional model of the turbine blade; installing the turbine blade and measuring the theoretical point orientation; fitting the corresponding preset three-dimensional turbine blade according to the theoretical point orientation Model, determine the hole position, hole type and number of holes, select the corresponding processing electrode; perform loss test and correction compensation on the processing electrode; control the alignment of the processing electrode according to the 3D model to process a single processing hole consistent with the 3D model; repeatedly control the processing electrode Feed and mill until all machined holes are machined. The present invention presets the three-dimensional model, then detects the configuration of the turbine blade and matches it with the corresponding three-dimensional model, determines the processing position, shape and quantity of the actual processing hole, and selects the corresponding processing electrode for alignment processing, so that the position of the processing hole, The shape and quantity are consistent with the three-dimensional model, the position is regular, and the shape is uniform, so that the processing technology index of the expansion hole of the turbine blade has reached a higher level.

Description

technical field [0001] The invention relates to the technical field of machining turbine engine workpieces, in particular to a method for electric discharge milling to process expansion holes of turbine blades. Background technique [0002] Air film cooling is a cooling technology applied to gas turbine blades. It is mainly to design a large number of air film holes on the leading edge of the turbine blade and the blade body surface. The hole diameter is generally 0.2-0.8mm, and the space angle is complicated. The high-pressure cold air is extracted from the high-pressure stage and transported to the inner channel of the blade. The cold air strengthens the convection heat transfer in the channel and takes away part of the heat. At the same time, a part of the cold air is ejected from the air film hole on the blade wall. Under the action, it bends downstream, adheres to the blade wall, forms a cold air film with a lower temperature, isolates the wall from the high-temperature...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a method for EDM machining the expansion hole of the turbine blade to solve the problem of irregular position and non-uniform shape of the expansion hole of the turbine blade. By designing the hole model and writing a program, the bottom hole is cut by an EDM machine tool. The hole and the expansion hole are processed together to make the expansion hole of the turbine blade regular in position and uniform in shape to meet the theoretical design requirements

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