Method for measuring 3D profile surface by trigger measuring head on measuring machine

Abstract

The invention discloses a method for measuring a 3D profile surface by a trigger measuring head on a measuring machine, comprising the following steps: establishing a spatial measurement coordinate system according to the 3D profile surface; setting a measuring range covering the 3D profile surface; closing measuring needle radius compensation to cause a measuring needle to measure along a vector direction perpendicular to a profile projective surface; collecting measurement points on the 3D profile surface to cause three of the measurement points to form an equilateral triangle in the projective surface of the measurement coordinate system; calculating the center of gravity coordinate G of a micro-triangle plane formed by the three measuring points; calculating the normal vector V1 of the micro-triangle plane formed by the three measuring points by a vectormeter, starting the measuring needle radius compensation, taking the center of gravity coordinate G as a measurement target point, taking the normal vector V1 as a measuring needle reaching direction to measure the coordinate figure of the center of gravity coordinate G, and the like completing the measurement of the 3D profile surface. The method can be used for the measurement of the 3D profile surface of a large-scale complex profile and has the advantages of high measurement accuracy and high measurement efficiency.

Description

technical field [0001] The invention relates to the technical field of automatic measurement, in particular to a method for measuring a 3D contour surface. It is a measurement method or software for precise measurement of 3D contour surfaces by using a trigger type probe to start stylus radius compensation on a three-coordinate measuring machine and using the isometric method; Reverse engineering; at the same time, it is also suitable for 3D contour surface measurement and reverse engineering of special-shaped parts such as molds and automobile industries in my country's machinery manufacturing industry. Background technique [0002] In the metrology test of the spatial curved surface with the touch probe in the three-coordinate measurement, the key technology is how to compensate the radius value of the stylus. The key to compensating the radius of the stylus is to calculate the normal vector of the measured point on the 3D contour surface; In the measurement of reverse eng...

AI Technical Summary

Problems solved by technology

[0003] In addition, in the metrology and testing industry, there are many methods for measuring 3D contour surfaces, such as CCD optical probes and laser scanning systems for contour scanning of external parts. Although the measurement accuracy is not very high, the efficiency is very high. Commonly used In the automotive industry; there are also high-precision profilers for 3D profile measurement. Although the accuracy is close to nanometers, the measurement range is small and the application range is narrow; there are also SP600 contact scanning probes on the measuring machine, but relevant measurement systems and application software are required.

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