CFXYZA type five-axis numerical control machine tool rotation axis geometrical error calculation, compensation and verification method thereof

Abstract

The invention discloses a CFXYZA type machine tool rotation axis geometrical error calculation, compensation and verification method thereof. When the rotation axis of a CFXYZA type five-axis numerical control machine tool rotates, a ball bar is installed between the spindle end and a workbench to establish the relative position point coordinates and attitude vectors between the centers of spheres of two measurement balls of the ball bar, and then the position point error and the attitude vector error are compensated through the corrected numerical control codes. The concrete process is that firstly the rotation angle of the A-axis and the C-axis is corrected to compensate the attitude vector error, then the moving axis is adjusted to compensate the position point error, and finally the circular trajectories in the motion process before and after compensation are measured by using the ball bar so that the error compensation effect is evaluated by comparing the roundness deviation of the error trajectories between the actually measured circular trajectories and the geometrical circle. The code correction operation involved in the error compensation and verification process is discussed in a detailed way so as to be quite suitable for rapid compensation and verification of the machine tool rotation axis geometrical error.

Description

technical field [0001] The invention relates to the technical field of error compensation of numerical control machine tools, in particular to a method for calculating, compensating and verifying the geometric errors of the rotational axis of a CFXYZA five-axis numerical control machine tool. Background technique [0002] The geometric error of the rotation axis of the five-axis machine tool not only directly affects the position of the cutting point of the tool, but also affects the attitude vector of the tool axis. Therefore, compared with the three-axis machine tool, the addition of two rotation axes brings certain difficulties to the improvement of machining accuracy. [0003] The error compensation effect of the rotary axis motion can be evaluated by analyzing the surface profile accuracy of the processed test piece, but this method needs to process the test piece and use a three-coordinate measuring machine to detect the surface profile of the test piece, the process is...

AI Technical Summary

Problems solved by technology

[0002] The geometric error of the rotation axis of the five-axis machine tool not only directly affects the position of the cutting point of the tool, but also affects the attitude vector of the tool axis. Therefore, compared with the three-axis machine tool, the addition of two rotation axes brings certain difficulties to the improvement of machining accuracy.

[0003] The error compensation effect of the rotary axis motion can be evaluated by analyzing the surface profile accuracy of the processed test piece, but this method needs to process the test piece and use a three-coordinate measuring machine to detect the surface profile of the test piece, the process is cumbersome and complicated, and this method cannot be directly Get the compensation effect of the different error terms of the two rotation axes

[0004] A ballbar can be used to directly check the motion circle trajectory of the rotating shaft, but the verification of the compensation effect involves a relatively complicated calculation process. This patent proposes a new solution based on a ballbar that can quickly and accurately verify the compensation accuracy of the geometric error of the rotating shaft and Its detailed calculation method has engineering application value for improving the geometric accuracy of multi-axis CNC machine tools

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