Measuring device for inner hole coaxiality of mechanical parts

Abstract

The invention discloses a device for measuring the coaxiality of inner bores of mechanical parts. The device comprises a support and a cylindrical positioning sleeve horizontally fixed connected to the support; a straight pipe of a horizontally arranged inner diameter gauge is inserted in the positioning sleeve and fixed; the side head of the inner diameter gauge extends out of the positioning sleeve; first, second, third and fourth steel balls which radially protrude the outer wall of the positioning sleeve are arranged in the positioning sleeve; the first and second steel balls are positioned on the same section of the positioning sleeve, and are distributed by 120+ / -5 degrees in the circumferential direction of the positioning sleeve; a fifth steel ball which radially protrudes the outer wall of the positioning sleeve is arranged in the positioning sleeve, and is supported by a spring; the spring takes the inner wall of the positioning sleeve as a spring seat; and the distances between the fifth steel ball and the other four steel balls are equal, and the fifth steel ball and the other four steel balls are positioned on opposite surfaces in the circumferential direction of the positioning sleeve. The device can measure the coaxiality of two inner surfaces of a deep-bore workpiece, and has the characteristics of convenience and practicability.

Description

Technical field: [0001] The invention relates to a device for measuring the coaxiality of inner holes of mechanical parts. Background technique: [0002] In mechanical parts, position error measurement is a difficult point, especially the special requirements of some parts cannot be detected by general measuring instruments, such as figure 2 As shown in the figure, the inner diameter of the inner hole of the part is different, the inner diameter of the outer end hole is larger than the inner diameter of the inner end hole, and the outer end hole is the benchmark, and the inner end hole has coaxiality requirements with respect to the outer end hole, which cannot be detected by a general-purpose instrument. Invention content: [0003] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a device for measuring the coaxiality of an inner hole of a mechanical part, which meets the detection requirements. [0004] The present inv...

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Problems solved by technology

[0002] In mechanical parts, position error measurement is a difficult point, especially the special requirements of some parts cannot be detected by general measuring instruments, such as figure 2 As shown, the inner diameter of the inner hole of the part is different, and the inner diameter of the outer end hole is larger than the inner diameter of the inner end hole. The outer end hole is used as the reference. The inner end hole has a coaxiality requirement with respect to the outer end hole, which cannot be detected by general instruments.

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