Method for measuring and evaluating position degree and profile degree of blade-shaped hole of flow channel blade-shaped plate

Abstract

The invention discloses a method for measuring and evaluating the position degree and profile degree of a blade-shaped hole of a flow channel blade-shaped plate, which comprises the following steps of: aligning a three-dimensional optical measuring machine with a theoretical model grid, and establishing a reference plane by selecting three proper points near a curved surface at the outer edge of the blade-shaped hole, so that a three-dimensional curve characteristic is converted into a 2D curve characteristic by a plane projection method, the segmented fitting operation is performed through the selected segmented lines, and the evaluation method can be processed according to the prior art. The method has the advantages that the to-be-measured characteristics of the flow channel blade plate are directly obtained, contour measurement errors caused by cosine errors do not exist, a blade hole position degree and contour degree evaluation fitting method is provided, the actual machining state of the blade-shaped hole is truly reflected, the measurement precision of the flow channel blade-shaped plate is improved, and the welding assembly repair rate of the flow channel blade-shaped plate and the stator blade is reduced.

Description

technical field [0001] The invention relates to the technical field of aviation manufacturing and processing, and specifically relates to the measurement and evaluation technology of the airfoil hole position degree and contour degree of the flow channel airfoil plate. Background technique [0002] The flow channel vane plate is one of the key components of the high-pressure stator assembly of the aero-engine, and the position and contour of the vane hole directly affect the assembly effect of the stator vane. Since the airfoil holes are in the shape of an airfoil (maximum width 1.2mm, chord length 28mm) and are distributed on a cylindrical surface, the contact three-coordinate measurement cannot be accurately measured and evaluated. Generally, a curtain plate is used to detect the blade of a flat test piece on a projector. Hole contour degree, process the round hole on the part process test piece, use three coordinates to measure its position degree, replace the leaf shape ...

AI Technical Summary

Problems solved by technology

Since the airfoil holes are in the shape of an airfoil (maximum width 1.2mm, chord length 28mm) and are distributed on a cylindrical surface, the contact three-coordinate measurement cannot be accurately measured and evaluated. Generally, a curtain plate is used to detect the blade of a flat test piece on a projector. Hole contour degree, process the round hole on the part process test piece, use three coordinates to measure its position degree, replace the leaf shape hole position degree, rely on the leaf shape hole forming process to ensure its position degree, it is an indirect qualitative measurement, not only the process It is cumbersome, and the measurement accuracy is unreliable, and it cannot truly express the processing status of the part

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