Geometry repair method for damaged area of complex curved surface part

Abstract

The invention provides a geometry repair method for a damaged area of a complex curved surface part, belongs to the field of computer auxiliary design and manufacture, and relates to the repair method for a complex geometric curved surface with part damaged. According to the geometry repair method, by establishing the relation between actually-measured cross section data of the complex curved surface damaged part and a nominal geometry template curve of the complex curved surface damaged part, and utilizing an optimization method capable of achieving alternating iterative registration and free deformation, namely, alternating a quantity method to calculate the closest point from an actual measurement point to the template curve and solve of translation, rotation and deformation transformation matrices, geometric deviation between the template curve and actual measurement data of the damaged part is gradually decreased, the designed template curve and the measurement point can fit to the largest extent, therefore, a damaged cross section contour curve is reestablished, covering operation is performed on the cross section contour to generate the curved surface of the complex part, and the geometrical shape of the damaged area is effectively recovered. By means of the geometry repair method, the problem of large deviation between three-dimensional measurement data of the complex curved surface damaged parts and an original computer-aided design (CAD) model is solved, and accuracy and practical applicability of geometry repair are ensured.

Description

technical field [0001] The invention belongs to the field of computer-aided design and manufacture, and relates to a method for repairing complex geometric curved surfaces damaged by parts. Background technique [0002] Parts with complex curved surfaces such as blades are prone to damage such as cracks, corrosion, and fractures due to long-term operation in harsh environments such as high temperature, high heat, and high speed, and are deformed to varying degrees, resulting in the existence of actual geometric shapes and nominal geometric models of damaged complex parts. If there is a large deviation, its nominal geometric model is no longer suitable for design, processing and other steps. Therefore, in order to precisely repair damaged parts with complex surfaces, it is necessary to restore the actual geometric shape of the damaged part first, that is, to perform geometric repair on the damaged area. The geometric repair of damaged parts with complex curved surfaces is th...

AI Technical Summary

Problems solved by technology

This method reconstructs the two-dimensional contour of the damaged area by gradually fitting the template curve to the defect cross-section data, and then generates a surface from the cross-section curve, which overcomes the defects of the prior art and avoids the cumbersome operation process and excessive Manual intervention, and problems that do not meet the repair quality and accuracy requirements

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