Axial line correction method of cylindrical workpiece and diameter measurement method of sectioned section of cylindrical workpiece

Abstract

The present invention relates to an axial line correction method of a cylindrical workpiece. According to the method, the spatial relative position of the workpiece under a measurement coordinate system is determined based on the design of the reference point C0 of the end surface of the workpiece; the first correction deltax and deltay of the deviation of a positioning section ZA and a positioning section ZB of the workpiece on an X axis and a Y axis are realized through using two groups of symmetrically-correlated compensation points on the positioning section ZA and the positioning sectionZB of the workpiece; the outlines of the positioning section ZA and the positioning section ZB are resampled, so that sampling points are obtained, a center point O'A and a center point O'B are obtained through fitting calculation; with a straight line determined by the center point O'A and the center point O'B adopted as a reference axis phi of the cylindrical workpiece, a geometric relationshipwith the reference point C0 is built and is solved; and the calibration and correction of a relative deviation angle theta between the reference axis phi and the Z axis of the measurement coordinate system are realized. The present invention also provides a diameter measurement method of the sectioned section of a cylindrical workpiece. According to the diameter measurement method, a geometric relationship between the correction values deltax and deltay of positioning sections and a measured section is built; linear compensation values deltaxi and deltayi are obtained; the coordinates of a probe relative to a sampling point are calculated; integrated and automatic sampling on the outline of the measured section is realized; and a spatial projection and fitting algorithm is adopted to process sampling data to obtain the quantity value of the measured section.

Description

technical field [0001] The invention relates to a method for correcting the axis line of a cylindrical workpiece, and also relates to a method for measuring the diameter of each segmented cylindrical section on the cylindrical workpiece. Background technique [0002] Workpieces with cylindrical features are widely used in advanced industrial manufacturing fields such as aerospace, ships, high-speed rail, automobiles, and household products. Their geometric dimensions are crucial to the final product assembly and performance quality. With the improvement of the quality of products made in China, when designing and processing cylindrical workpieces, the measurement accuracy of its multiple geometric features is getting higher and higher. The requirements of the main journal or connecting rod journal make the detection of several dimensions of cylindrical workpieces not limited to the traditional roundness and cylindricity error measurement, but must include the high precision ...

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for correcting the axis line of a cylindrical workpiece, which solves the technical problem in the prior art that the accuracy of the axis line cor...

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