Gas turbine blade defect three-dimensional space positioning method based on digital rays

Abstract

The invention discloses a gas turbine blade defect three-dimensional space positioning method based on digital rays. A machine coordinate system, an image coordinate system and a workpiece coordinatesystem of a system are established separately; the machine coordinate system determines transformation relations between the machine coordinate system and the image coordinate system and between the machine coordinate system and the workpiece coordinate system through Cartesian coordinate system expression to achieve unification of the coordinate systems; by conducting transillumination on bladesat two different angles, two-dimensional projection detection images of the blades and other defect features are obtained, and three-dimensional space positioning of the defects relative to the bladesis achieved by analyzing the defect features, the position relation of the project, on an imaging plane, of the rotation center line of a rotary table and the change rule of the defect features alongwith the transillumination angles. The method is simple in step, three-dimensional space positioning of all the defects of a certain type of blades can be achieved through one-time coordinate systemestablishment and unification, the detection efficiency is effectively improved, and the detection cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of industrial ray nondestructive testing, and in particular relates to a three-dimensional space positioning method for gas turbine blade defects based on digital ray. Background technique [0002] Gas turbine is a kind of large rotating impeller power equipment widely used in electric power, navigation and other fields. At present, my country has not yet fully mastered the key technologies for the manufacture of core components of gas turbines represented by blades, and related products mainly rely on foreign imports. The blade is the core aerodynamic part of the gas turbine that interacts with the high-temperature, high-pressure, and high-velocity working medium and realizes energy conversion. It is usually manufactured using a precision casting molding process, and it needs to withstand a huge working load under extremely high temperature and pressure. Because the blades may form defects such as holes, c...

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Problems solved by technology

However, there are two limitations: on the one hand, due to the high attenuation coefficient of the nickel-based superalloy, which is the material of the blade, the CT with low power cannot completely penetrate the bla

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