Hollow turbine blade wall thickness deviation reverse regulation and control method based on ceramic core positioning compensation

Abstract

The invention belongs to the technical field of aeroengine hollow turbine blade investment precision casting, and particularly relates to a hollow turbine blade wall thickness deviation reverse regulation and control method based on ceramic core positioning compensation. The method comprises the following steps: 1) acquiring data of inner and outer contour points of an actual hollow turbine blade;2) carrying out three-dimensional iterative registration on the outline points of the blade and a design model; 3) calculating the pose drift amount of the ceramic core in the precision casting process; 4) calculating the reverse offset of the ceramic core; 5) reversely biasing the ceramic core design model; and 6) adjusting the size of the wax mold ceramic core positioning element. The problem that the wall thickness size of an existing aero-engine hollow turbine blade is out of tolerance seriously is solved. From the perspective of ceramic core pose regulation and control, the spatial poseof a ceramic core in a wax pattern is changed by adjusting the size of a ceramic core positioning element in the wax pattern mold, then a core shift wax pattern is formed, and finally the purposes ofimproving the position matching relation between a shell and the ceramic core and achieving accurate control over the wall thickness precision of the hollow turbine blade are achieved.

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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