Five-axis numerical control machine tool space error distinguishing method

Abstract

The invention belongs to the field of numerical control machine tool measurement technology study and particularly relates to a five-axis numerical control machine tool space error distinguishing method. According to the method, a ball bar instrument error measuring device with one end fixed to a main shaft of a five-axis numerical control machine tool and the other end fixed to the center of a rotating working table is put up; a space error measuring model is set up; a model test is set up, by means of compensation work at different angles of a ball bar instrument, the theory bar length of the ball bar instrument of the numerical control machine tool and the actual bar length displayed by the ball bar instrument are read, data is taken into the space error measuring model, the angle errorfactor and the rotating error factor of a rotating shaft of the five-axis numerical control machine tool are distinguished, the ball bar instrument is changed from XOY single plane motion into spacemulti-plane motion, and the distinguishing range of the ball bar instrument is converted from plane rotation into space rotation.

Description

technical field [0001] The invention belongs to the research field of numerical control machine tool measurement technology, and relates to a five-axis numerical control machine tool space error identification method. Background technique [0002] The original error identification method of CNC machine tools is to install one end of the ballbar in the tool cup and the other end on the center seat. By adjusting the length of the ballbar and the height of the center seat, after running the program, and then according to the corresponding algorithm, the error elements in the XOY plane can be obtained; this method is mostly used for the measurement of three-axis machine tools, and for five-axis machine tools by its It is the poor applicability of machine tool error measurement for surface processing; [0003] For five-axis CNC machine tools, there are a lot of coupling phenomena in multi-axis interpolation, and the spatial errors mainly include the linear error of the feed axis...

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Problems solved by technology

By adjusting the length of the ballbar and the height of the center seat, after running the program, and then according to the corresponding algorithm, the error elements in the XOY plane can be obtained; this method is mostly used for the measurement of three-axis machine tools, and for five-axis machine tools by its It is the poor applicability of machine tool error measurement for surface processing;

[0003] For five-axis CNC machine tools, there are a lot of coupling phenomena in multi-axis interpolation, and the spatial errors mainly include the linear error of the feed axis and the rotation error of the rotary axis; most of the original identification methods use changing the installation height of the ballbar Based on the ballbar length method, this method is easy to add interference errors in the adjustment process, resulting in inaccurate solution results; at the same time, the traditional method needs to dismantle the ballbar multiple times, because it is difficult to disassemble and install in the same process. On the coordinate basis, the resulting data is poorly referable. Moreover, the process of disassembly and reinstallation takes a long time, which is not conducive to automatic compensation, especially not conducive to the later research of machine learning and macro programming.

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