A method for adjusting the tool trajectory of the reconstructed surface of near-net-shaped blades

Abstract

The invention relates to a method for adjusting the tool trajectory of a near-net shape blade reconstruction profile, comprising the following steps: obtaining and correlating the first feature point on the theoretical processing profile surface and the second feature point on the actual processing profile surface; Surface deformation of the processing type facing the first feature point; obtain the first sequence of tool tangent point, tool axis vector, surface parameters and tool axis angle; calculate the maximum chord length error and maximum residual height of each tangent line; in the actual Calculate the tangent point and normal vector on the processing surface to obtain the third sequence; check, adjust and complement each tool tangent point; rotate the normal vector as the tool axis vector; adopt the quadratic programming method to adjust the tool axis The vector is smoothed and optimized to determine the tool trajectory of the actual machining surface. The purpose of the method for adjusting the tool track of the reconstructed profile of the near-net-shaped blade is to solve the problem of large deviation in the process of adjusting the tool track of the reconstructed profile of the near-net-shaped blade.

Description

technical field [0001] The invention relates to the technical field of computer-aided manufacturing, in particular to an adjustment method for a near-net shape blade reconfiguration profile tool track. Background technique [0002] Near-net shaped blades, such as hollow blades, precision forged blades, linear friction welded blisk blades and repaired blades, etc., under the influence of the previous forming process, the actual position cannot coincide with the theoretical position in the process design, and the processed surface The characteristics such as interlacing with the non-processed surface cause the actual shape of the processed surface to be inconsistent with the theoretical shape in the process design, and it is difficult to guarantee the processing smoothness and tolerance requirements. It is necessary to restructure the processed surface to solve it. [0003] Because there is a certain deviation between the actual processing profile and the theoretical processin...

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Problems solved by technology

[0002] Near-net shaped blades, such as hollow blades, precision forged blades, linear friction welded blisk blades and repaired blades, etc., under the influence of the previous forming process, the actual position cannot coincide with the theoretical position in the process design, and the processed surface The characteristics of interlacing with the non-processed surface cause the actual shape of the processed surface to be inconsistent with the theoretical shape in the process design, and it is difficult to guarantee the processing smoothness and tolerance requirements. It is necessary to restructure the processed surface to solve the problem

[0003] Because there is a certain deviation between the actual processing profile and the theoretical processing profile, it is necessary to re-plan the CNC machining trajectory for the actual processing profile, and the manual programming method needs to be programmed for each near-net-shape blade. Difficult to adapt to the needs of mass production

[0004] The existing method mainly uses the distance method to map the point position of the original NC machining program to the new machining surface according to the shortest distance method, and at the same time load the tool axis vector to the new tool position point. This method has certain limitations. sex:

[0005] (1) There is a certain deviation between the theoretical processing profile and the actual processing profile, and there may be multiple original tool positions mapped to the same actual tool position, resulting in incorrect tool paths;

[0006] (2) The geometric characteristics of the actual machined surface are not considered in the process of tool point adjustment, and the chord length error and residual height of the actual machined surface cannot be consistent with the NC machining trajectory of the theoretically machined surface;

[0007] (3) The angle of the tool axis vector relative to the actual machining surface changes, resulting in an unstable machining process

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