Tool and method for reducing hot isostatic pressing deformation of investment casting turbine blade

Abstract

The invention discloses a method for reducing hot isostatic pressing deformation of an investment casting turbine blade. The method comprises the following step a of finding the gravity center of the turbine blade by utilizing three-dimensional cartographic software, and adjusting the posture so that the inertia principal axis direction of the turbine blade is parallel with the gravity direction; the step b of designing a tool, so that the shape of a blade root containing cavity is matched with the blade root of the turbine blade adjusted in the step a; and the step c of putting the turbine blade into the tool for hot isostatic pressing, so that the inertia principal axis direction of the turbine blade is always kept parallel with the gravity direction in the hot isostatic pressing process. The invention further provides a tool for reducing the hot isostatic pressing deformation of the investment casting turbine blade, and the tool comprises a tool base which is horizontally arranged, and the tool base is provided with the blade root containing cavity. The shape of the blade root containing cavity is matched with the shape of the blade root when the inertia principal axis direction is parallel with the gravity direction of the turbine blade. By adopting the tool and method for reducing the hot isostatic pressing deformation of the investment casting turbine blade, the deformation risk of the turbine blade is reduced, and the consistency of casting dimensions is improved.

Description

technical field [0001] The invention relates to a tooling and a method for reducing hot isostatic deformation of investment casting turbine blades, belonging to the technical field of investment precision casting of heavy-duty gas turbine blades. Background technique [0002] Heavy-duty gas turbine blades are cast by investment casting. The investment casting process is as follows, preparation "wax mold → wax mold assembly tree → preparation of ceramic shell → shell dewaxing → shell roasting → shell preheating → molten steel smelting and pouring → shell cleaning → hot isostatic pressing → heat treatment". [0003] In the above process, hot isostatic pressing can close the internal porosity and shrinkage cavity of the casting, which can greatly improve the comprehensive mechanical properties of the casting. The diffusion process realizes litigation and shrinkage cavity closure, and the casting is easily deformed during this process. Before hot isostatic pressing, the blades...

AI Technical Summary

Problems solved by technology

[0003] In the above process, hot isostatic pressing can close the internal porosity and shrinkage cavity of the casting, which can greatly improve the comprehensive mechanical properties of the casting. Diffusion process achieves litigation and shrinkage cavity closure, during which the casting is easily deformed

Before hot isostatic pressing, the blades are placed in the square hole material frame, and the position of each blade casting is different. When the direction of blade placement deviates greatly from the direction of the center of gravity of the blade, at high temperature, the casting will be affected by gravity. Deformation reduces the dimensional pass rate of castings

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