Method for detecting hole location degree by three-coordinate measuring machine

Abstract

The invention provides a method for detecting a hole location degree by a three-coordinate measuring machine. The method comprises the steps of (1) setting 88 small holes of a measured part to be 10 sets of core rods according to a tolerance of 0.01 mm, (2) steadily placing the measured part on a three-coordinate detection workbench, inserting the core rods into the small holes of the measured part to ensure that the core rods fit closely with the small holes of the measured part, (3) determining basic elements of measurement, (4) establishing a basic part coordinate system through PC-DMIS software on a three-coordinate measuring machine, and (5) selecting a measured object and completing the measurement. According to the method of the invention, the measurement of the location degrees ofthe small holes is converted into the measurement of the location degrees of the core rods through an indirect measurement method, the problem that the location degrees of the small holes cannot be measured and the normal angles of the centers of the small holes cannot be quantitatively judged is solved. The method of the present invention is applicable to a large number of repeated measurements of a single element, and the method of the invention has the advantages that the detection efficiency is improved greatly and the accuracy of detection is improved at the same time compared with a traditional detection method.

Description

technical field [0001] The invention belongs to the technical field of inspection and detection, and in particular relates to a method for detecting the position degree of a hole by a three-coordinate measuring machine. Background technique [0002] A part is a ring part with high precision. The feature of this part is: high material hardness; there are more than 80 oblique holes with a diameter of φ0.71 on the conical inclined surface along the circumference, and the projection angle in the XY coordinate plane is 4.09 degrees. . The design drawings require accurate quantitative evaluation to determine whether the position and normal angle of all holes are qualified. [0003] The traditional method of measuring hole position is generally a special comprehensive measuring tool inspection method or a direct judgment method using a three-coordinate measuring machine. Using the comprehensive measuring tool method to measure, because the part is a high-density small hole, the h...

AI Technical Summary

Problems solved by technology

Using the comprehensive measuring tool method to measure, because the part is a high-density small hole, the hole diameter is less than 1 mm, and all the holes are normal to the center, it poses a problem to the manufacture of the comprehensive measuring tool. Because of the level and accuracy, the manufacturing error of the comprehensive measuring tool has reached or exceeded the tolerance of the measured element, the position of the small hole cannot be accurately evaluated, and the normal angle of the center of the small hole cannot be given a quantitative judgment

A three-coordinate measuring machine is used for measurement. The diameter of the measuring head of the existing measuring machine is generally 1 mm, 2 mm, 3 mm, and 4 mm. Measure towards the center of the hole

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