A method for rounding the air film hole of a turbine guide vane

Abstract

The invention discloses a rounding method for a turbine guide vane film hole opening in order to improve the quality of the film hole opening and reduce and prevent cracks. According to the technical scheme, a magnetic polishing machine is adopted, burrs at the turbine guide vane film hole opening are eliminated by means of the characteristics of a rotary magnetic field, and rounding of the film hole opening is achieved. A traditional machining mode is broken through, it is detected that the residual magnetism of a machined vane is zero, and the rounding requirement of the high-pressure turbine guide vane film hole opening is met. Through the application verification of subsequent procedures and a high-temperature brazing technology, the vane has no melting corrosion phenomenon, the quality of the film hole opening is improved, cracks are reduced and prevented, and the anti-fatigue capacity of a part is greatly improved. Meanwhile, the labor intensity is relieved, and the operation environment is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for rounding an air film hole of a turbine guide vane. Background technique [0002] The guide vane of the high-pressure turbine of the aero-engine belongs to the precision casting double-cavity structure, and the material is cobalt-based superalloy. EDM forming, the structure diagram is shown in Figure 1(a) and Figure 1(b). [0003] The rounding of the air film hole of the turbine guide vane was first polished by hand with sandpaper, but it could only be polished with burrs on the air film hole on the outer surface of the blade body. When the engine was tested on the ground, cracks appeared on the blade body. The analysis shows that the roughness of the air film hole on the blade body and the stress concentration on the sharp edge of the hole are an important reason for the cracks. The rounding of the air film hole of the blade is now using the abrasive ...

AI Technical Summary

Problems solved by technology

The rounding of the air film hole of the blade is now using the abrasive flow process, which can effectively improve the quality of the air film hole and reduce and prevent cracks. However, due to the high viscosity of the abrasive used, the inner cavity of the blade cannot be thoroughly processed by abrasive flow. Clean up, the low melting point substances such as boron oxide and dimethyl silicone oil contained in the abrasive will cause the blade to erode during the high temperature brazing process in the subsequent process

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