Integral impeller blade semi-finishing method for removing residual stress with aid of laser

Abstract

The invention discloses an integral impeller blade semi-finishing method for removing residual stress with the aid of laser. The surface of an integral impeller blade to be machined is subjected to laser shot-blasting strengthening treatment by adopting pulse laser beams after a thermal treatment procedure and before a conventional semi-finishing procedure, and a surface deformation layer caused by the laser shot-blasting strengthening treatment is removed by milling, so that the residual pressure stress and the residual tensile stress respectively produced by the front and rear procedures are counteracted with each other, deformation produced after the stress of the blade is released is effectively controlled, micro cracks are reduced, and the machined integral impeller blade has good stability and reliability. The method is applied to stress removing mechanical cutting machining of complex impeller blades having various structures.

Description

technical field [0001] The invention relates to a processing method for a semi-open centrifugal integral impeller, in particular to a semi-finishing method for an integral impeller blade with laser-assisted removal of residual stress, and belongs to the technical field of mechanical cutting processing and manufacturing. Background technique [0002] The impeller is a typical part of complex curved surface processing in aerospace devices. In the traditional milling process, a large amount of cutting heat will inevitably be generated, which will cause residual tensile stress on the surface of the blade, resulting in the appearance of micro-cracks and reducing the service life of the overall impeller. Due to the thin side wall of the impeller blade, the thin-walled blade is easily deformed after the stress is released, thereby reducing the manufacturing accuracy of the impeller. [0003] In recent years, my country has carried out extensive research on impeller manufacturing an...

AI Technical Summary

Problems solved by technology

All the above-mentioned patents cannot solve the problems such as deformation of the blade and micro-cracks on the surface of the blade after the release of the residual tensile stress caused by the cutting heat in the processing of the impeller blade. With the rapid development of my country's aerospace manufacturing industry, there is an urgent need for a real-time removal Machining Method of Integral Impeller Blades with Residual Stress

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