A processing method for online measurement and compensation of milling deformation of thin-walled parts

Abstract

The invention discloses an online milling deformation measurement and complementation machining method for a thin-walled part. The online milling deformation measurement and complementation machining method for the thin-walled part comprises the steps that 1, a three-dimensional model of the thin-walled part is established, and a numerical control code is obtained; 2, measurement point locations are extracted from the three-dimensional model; 3, based on the model, a measurement path is planned; 4, rough machining and semi-precise machining are conducted on a workpiece blank; 5, online measurement is conducted, and the coordinate values of all the planed measurement point locations are obtained; 6, the obtained coordinate values of the planed measurement point locations are compared with those of the corresponding point locations on the three-dimensional model of the thin-walled part, and the difference between the coordinates of each point location of the actually machined workpiece and those of the corresponding point location on the three-dimensional model is calculated; 7, according to the machining differences, a complementation factor optimal machining path is generated according to the machining differences, precise machining is conducted according to the path, and then the final deformation deviation and the compensation values are obtained. By the adoption of the online milling deformation measurement and complementation machining method, semi-precise machining and precise machining are adopted, the identical machining parameters are adopted by the semi-precise machining and the precise machining, and the best precise machining compensation effect of the thin-walled parts which are made of the same materials and have the same characteristics can be achieved to the greatest extent through only one group of tests.

Description

technical field [0001] The invention relates to the technical field of measurement and compensation of processing errors of thin-walled parts, in particular to an online measurement and compensation processing method for milling deformation of thin-walled parts. technical background [0002] In the field of aerospace, in order to reduce the weight of parts, it is usually designed as a thin-walled structure with a thickness of less than 2mm. At the same time, in order to improve the specific strength, titanium alloys and aviation aluminum alloys with superior performance are generally used as materials for key parts and structural parts. , the final accuracy of the parts is relatively high, but these materials have poor cold processing performance and severe tool wear. Due to the weak rigidity of the thin-walled structure, they are very sensitive to cutting forces and machine tool motion errors, especially when the machine tool has been working for a certain number of years. ...

AI Technical Summary

Problems solved by technology

This method is mainly aimed at in-situ compensation processing of curved surface parts with conventional thickness. For thin-walled planar parts with a thickness of less than 2mm, the compensation processing effect after measurement is not obvious, and the processing method of complete mirror compensation may have a negative effect on thin-walled parts. come bigger deformation

The Chinese patent application with the application number 201210364066.X discloses a thin-walled blade precision milling deformation compensation method, which is based on the point data of the three-coordinate measurement, and solves the problem of precision machining of blade parts through multiple iterations. However, this method uses the three-coordinate offline detection method, which requires secondary clamping, resulting in interruption of the machining process and loss of the machining coordinate system. At the same time, the method of multiple iterations is an iterative process, which reduces the efficiency of machining.

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