Method for precisely measuring 3D profile by using measuring needle central coordinate and vector compensation technology

Abstract

The invention discloses a method for precisely measuring a 3D profile by using the measuring needle central coordinate and vector compensation technology, which comprise: establishing a spatial measurement coordinate system according to the 3D profile; setting the measurement range which covers the 3D profile; closing measuring needle radius compensation to allow a measuring needle to measure along the vector direction vertical to the projection plane of the profile; collecting four measuring points in the curved surface of the space, so that three measuring points form a micro triangle, the three vertexes of the triangle form an equilateral triangle in the projection plane of the measurement coordinate system, and the projection point of the other measuring point P is of the center M of the equilateral triangle; calculating the normal vector V1 of the plane of the micro triangle formed by the three measuring points; starting measuring needle radius compensation, taking the P point as a measuring target point, taking the V1 as the measuring needle approach and compensation direction to measure the 3D profile; and so forth, completing the measurement of the 3D profile. The invention can be used for the measurement of the 3D profile with large range and complex profile, and has the advantages of high accuracy and measuring 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 using a touch-sensitive probe on a three-coordinate measuring machine to start stylus radius compensation and use stylus center coordinates and vector compensation technology; the invention is applicable to tobacco machinery parts Measurement test and reverse engineering of 3D contour surface; 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...

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. It is often used in 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; SP600 contact scanning probes are also used on measuring machines, but relevant measurement systems and application software are required.

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