Turbine blade air film hole precision forming method

Abstract

The invention discloses a turbine blade air film hole precision forming method, and belongs to the field of rapid casting based on a photocuring forming technology. The turbine blade air film hole precision forming method comprises the following steps: 1) manufacturing a turbine blade resin mold by using the photocuring rapid forming technology; 2) pouring ceramic slurry into a resin mold prototype of a turbine blade through a gel casting method to obtain a casting mold blank body, so that forming of an air film hole ceramic core is realized; 3) further strengthening the air film hole ceramiccore through vacuum freeze drying and high-temperature sintering, so that forming of different ceramic-based air film hole ceramic cores is realized; and 4) for the air film hole ceramic cores with different types of ceramic bases, combining a directional solidification technology to realize air film hole casting forming of various high-temperature alloys, and finally removing the ceramic cores remained in a metal blade and an air film hole through a core removing process, so that high-quality forming of the cast air film hole is realized. The turbine blade air film hole precision forming method is reasonable in design and simple and convenient to operate, and can realize forming of the high-quality cast air film hole.

Description

technical field [0001] The invention belongs to the field of rapid casting based on light curing molding technology, and relates to a precision forming method for air film holes of turbine blades. Background technique [0002] Hollow turbine blade high-efficiency film cooling technology is one of the core technologies in the development of heavy-duty gas turbines, and the film holes are developing in the direction of miniaturization, irregular structure and dense distribution. At present, the air film cooling holes of blades are realized by post-processing. After the blade casting blank is polished and trimmed to determine the process reference plane, laser drilling, electric spark drilling, electro-hydraulic beam drilling and other methods are used to realize the processing of gas film holes. [0003] Laser drilling technology uses the high temperature at the laser focus point to instantly melt and vaporize the blade material, and the melted and vaporized substances are ej...

AI Technical Summary

Problems solved by technology

The electric spark drilling technology uses the potential energy generated by the discharge between the conductive part material and the tool electrode to remove the material, and the production efficiency of this method is low

At the same time, because EDM belongs to thermal processing, it will generate a certain thickness of remelted layer on the processing surface, which has problems such as uncontrollable processing dimensional accuracy, uncontrollable processing taper, low surface roughness, many burrs, and low processing quality.

Electrohydraulic beam machining of gas film holes will not produce remelted layers, microcracks and heat-affected zones, but its processing efficiency is low, and the repeatability of dimensional accuracy is poor. It can only process round holes of a certain size range, and cannot process special-shaped holes and multi-angle oblique holes. hole

At present, the existing technology still has great challenges for the manufacture of more complex shapes of special-shaped film holes and the film holes of single crystal blades, and it is difficult to realize the shape-controlled and precise manufacturing of film cooling holes.

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