Laser machining process of special-shaped film hole of turbine blade

Abstract

The invention relates to a laser machining process of a special-shaped film hole of a turbine blade. The process comprises the following steps of film hole CAD model introducing and slicing; wall protecting and filling, and blade assembling and clamping; blade surface MARK point identifying / matching automatic positioning and reference correcting; laser machining and online monitoring; post-machining treatment; and industrial CT multi-angle flaw detection and detecting. The machining process has the beneficial effects of realizing precise machining of the complex special-shaped film hole, improving the surface integrity of film hole machining, having great significance for improving the quality of a turbine engine / gas turbine, and providing technical support for the development of a newgeneration turbine-type aero-engine and marine gas turbine.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a laser processing technology for special-shaped air film holes of turbine blades. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Modern advanced turbo-type aero-engines / gas turbines generally use small-hole film cooling technology to increase the temperature before the turbine, thereby increasing the thrust-to-weight ratio of the engine. The main structural feature of the small-hole film cooling technology is that a large number of film holes are designed on the leading edge of the turbine blade, the airfoil profile, and the edge plate. The angles of th...

AI Technical Summary

Problems solved by technology

At present, the commonly used method in China is electric discharge machining (EDM), but now complex special-shaped holes often require high three-dimensional precision machining capabilities, and EDM processing is difficult to meet the increasingly high precision requirements

Secondly, EDM processing consumes a lot of tool electrodes, but it is difficult to manufacture and repair, and the price is expensive; at the same time, EDM processing will also produce remelting layers and microcracks, and the post-processing process is complicated and cumbersome

In addition, EDM cannot process non-conductive materials, so in the future blades with thermal barrier coatings, ceramic matrix composite materials, carbon-silicon composite materials and other new material blades with excellent performance will not be able to use EDM

Both electrochemical machining and electrohydraulic beam machining will not produce remelted layers, microcracks, and heat-affected zones, but both have significant limitations, such as low machining efficiency, poor repeatability, and stray corrosion , resulting in difficulty in controlling the contour shape of the opening, etc., which cannot meet the mass production requirements of complex special-shaped holes

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