Visual measurement method for dynamic error of five-axis CNC machine tool

Abstract

The invention belongs to the field of geometric error measurement for machine tools and relates to a method for measuring dynamic space track errors of the machine tools by means of binocular vision, in particular to a dynamic error vision measurement method for a five-axis numerical control machine tool. The measurement method includes the steps that according to a three-dimension perceptive function of binocular vision measurement, multiple errors are measured and separated at a single time; and four types of spherical mark points are reasonably distributed at a machine tool cutter end and on the surface of a working table, and the position relation among a vision coordinate system, a machine tool reference coordinate system and a machine tool cutter principal axis coordinate system is calibrated by means of feature information of the spherical mark points. During measurement, a vision measurement system continuously, statically and dynamically collects images of the spherical mark points, then moving errors of all machine tool axes are solved, and the obtained theoretical value and actual machine tool moving amount are combined, so that the moving errors of each axis are solved. According to the dynamic error vision measurement method for the five-axis numerical control machine tool, the machine tool space track errors are measured by means of a binocular high-speed camera, so that the error measurement accuracy is improved, the measurement range of the machine tool moving track is widened, the measurement method is simple and reliable, and the measurement process is simplified.

Description

technical field [0001] The invention belongs to the field of geometric error measurement of machine tools and relates to a method for measuring dynamic space track errors of machine tools by using binocular vision. Background technique [0002] Five-axis linkage CNC machine tool is an important symbol to measure a country's assembly and manufacturing level, and it is the main processing machine tool for core variable curvature components in major national engineering fields such as aerospace, ships, and automobiles. Due to the limitation of machine tool design and manufacturing level and the influence of other coupling factors, there are errors, which make the actual position between the tool and the workpiece in CNC machine tool processing engineering deviate from the theoretical position, which reduces the machining accuracy. Improving the manufacturing accuracy of CNC machine tools is a major challenge in this field. major issues. Spatial error is the main source of mach...

AI Technical Summary

Problems solved by technology

Although this method provides a new method for machine tool detection, the laser interferometer used cannot realize the simultaneous measurement of multiple geometric errors of the machine tool.

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