Turbine blade detection method

Abstract

The invention discloses a turbine blade detection method. The detection method comprises the steps that CT scanning is conducted on the turbine blade to obtain a CT image of a to-be-detected part, andedges are extracted through a Facet model; horizontal scanning is carried out on the CAD drawing to obtain a CAD image containing the edge point set; fine registration is carried out on the CT imageand the CAD image by an SVD-ICP algorithm; and according to the registration condition, turbine blade error distribution is judged, and whether the turbine blades are qualified or not is detected. According to the detection method provided by the invention, the Facet model is utilized to extract the edge, and the SVD-ICP algorithm is used for fine registration, the to-be-detected part can be detected only by knowing the coordinate of a complete reference point of the turbine blade and the relative coordinate of the to-be-detected part relative to the reference point, errors can be quickly andvisually seen, and the method plays a guiding role in blade external dimension machining. Detection is conducted before later machining, unqualified products are directly remelted, next machining isnot needed, and time and cost are saved.

Description

technical field [0001] The present application relates to the technical field of turbine blade detection, in particular to a detection method of a turbine blade. Background technique [0002] The turbine is an important part of the core machine of an aero engine, and it is also the part of the engine with the highest temperature, the most complex stress, and the harshest environment. At present, most turbine blades adopt hollow structure design. The outer structure of the blade is composed of blade body, edge plate, transition section, tenon teeth, etc., and the internal structure includes transverse ribs, longitudinal ribs, flow-finding columns and stacking shafts. A lot of small pipes are designed on the board, so that the high-pressure cold air flows through these pipes and passes through the high-temperature blades, so as to forcibly cool the turbine blades and improve the heat resistance of the turbine. Turbine blades are complicated in shape, high in requirements, dif...

AI Technical Summary

Problems solved by technology

Turbine blades are complicated in shape, high in requirements, difficult to process, and are prone to failures. The processing yield has always been very low.

[0003] Existing turbine blade inspection, including the inspection of its internal structure, is carried out after all processing is completed, but due to the complex structure of certain positions inside the blade, the yield rate is low, and post-processing accounts for 70% of the processing cost Left and right, if the internal structure is detected to be unqualified, all previous efforts will be wasted, not only wasting time and cost, but also causing a lot of waste of materials and energy

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