Reverse control method of hollow turbine blade wall thickness deviation based on ceramic core positioning compensation

Abstract

The invention belongs to the technical field of investment casting precision casting of hollow turbine blades of aero-engines, and in particular relates to a reverse regulation method for wall thickness deviation of hollow turbine blades based on ceramic core positioning compensation. It includes the following steps: 1) Obtaining the data of the inner and outer contour points of the actual hollow turbine blade; 2) Three-dimensional iterative registration of the blade contour points and the design model; 3) Calculating the position and attitude drift of the ceramic core during the precision casting process; 4) Calculating the reverse direction of the ceramic core Offset; 5) Reverse offset ceramic core design model; 6) Adjust the size of the positioning element of the wax-type mold ceramic core. The invention aims at the serious problem of out-of-tolerance wall thickness and size of the hollow turbine blades of aero-engines. From the perspective of pottery core position and posture regulation, by adjusting the size of the ceramic core positioning components inside the wax-type mold, the space position and posture of the ceramic core inside the wax-type mold is changed, thereby forming " The "eccentric core" wax pattern finally achieves the purpose of improving the position matching relationship between the shell and the ceramic core, and realizing the precise control of the wall thickness accuracy of the hollow turbine blade.

Description

technical field [0001] The invention belongs to the technical field of investment casting precision casting of hollow turbine blades of aero-engines, and in particular relates to a reverse regulation method for wall thickness deviation of hollow turbine blades based on ceramic core positioning compensation. Background technique [0002] Hollow turbine blades are the core hot-end parts of aero-engines, and their forming accuracy has a direct impact on engine performance and life. At present, the shape accuracy of hollow turbine blades is mainly evaluated from two aspects: outline and wall thickness. Among them, wall thickness accuracy is a key indicator to ensure blade strength and cooling efficiency. However, judging from the implementation and application in the industry, at present, the wall thickness of the hollow turbine blade is seriously out of tolerance, and the pass rate is low. The leading cause of fatigue failure. Therefore, it is of great significance to study t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current hollow turbine blade precision casting process due to insufficient ceramic core limit and non-uniform deformation of the shell caused by ceramic core position and posture drift, and then resulting in the problem of hollow turbine blade wall thickness out of tolerance, the present invention provides a ceramic core based Reverse control method of hollow turbine blade wall thickness deviation based on positioning compensation

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