Inner diameter go-no go gauge

Abstract

The invention relates to an inner diameter go-no go gauge. The gauge comprises a handle and two measuring heads which are respectively installed at the go gauge end and the no-go gauge end of the handle. The two measuring heads are similar in shape; each measuring head comprises two concentric spherical arc working side surfaces which are respectively arranged at two sides in the longitudinal direction, two side planes which are respectively arranged at two sides in the transverse direction, and two parallel end planes which are respectively arranged at two ends in the axial direction of the handle, and the spherical diameters of the two spherical arc working side surfaces are the same as the specification diameter of the common go-no go gauge and are symmetrical about the center of sphere. Compared with the prior art, abnormal phenomena such as ellipse out-of-tolerance of the measured inner hole, local out-of-tolerance of the inner diameter taper and an out-of-tolerance state of the aperture in a tolerance critical value can be accurately and rapidly checked, frictional wear between the go-no go gauge measuring head and the measured hole in the operation process is small, and theinner diameter go-no go gauge is easy in operation, convenient, simple, rapid, accurate and reliable, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of aperture detection and relates to an inner diameter go-no-go gauge. Background technique [0002] In precision machining parts, the inspection of important aperture sizes is generally carried out with special inspection tools for go-no-go gauges. Compared with the use of general precision measuring tools such as inner diameter gauges and inner diameter micrometers or the use of CMM measuring machines, the operation is simple, efficient and fast. advantages, but there are also the following disadvantages or risks; [0003] At present, during the inspection of ordinary internal diameter go-stop gauges, they are judged to be qualified according to the standards of go-gauge pass and stop-gauge only, but there are generally two types of misjudgment risks as follows: [0004] 1) The qualified product is judged as unqualified and rejected. When the measured inner aperture is close to the technical requirements ...

AI Technical Summary

Problems solved by technology

This type of inner diameter go-no-go gauge whose working surface is a cylindrical surface. During operation, the contact surface between the working surface of the go-no-go gauge and the inner hole to be tested is a cylindrical fit. See the attached Figure 9 and Figure 10 , before using this type of go-no-go gauge for inspection, the cleanliness of the inner hole to be tested and the working surface of the go-no-go gauge is relatively high, and there are certain skill requirements for the operation methods of the inspection operator, and the gauge head is prone to jamming during the operation In the hole of the workpiece to be tested, there is a dilemma, and it is easy to damage the inner surface of the workpiece to be tested. Especially when inspecting soft material workpieces, it is more likely to be stuck between the go-no-go gauge and the workpiece. For some large-scale common Inner diameter go-no-go gauges often have problems such as heavy weight of the gauge itself, laborious operation, easy jamming, or misjudgment of the workpiece.

[0007] The inspection and control of ordinary internal diameter go-no-go gauges have the risks of inspection misjudgment and inspection failure described in the previous clauses. Therefore, for the inspection and control of important aperture matching dimensions of some key equipment or safety-related mechanical products, in the actual operation process, in order to To ensure product quality and reduce risks, companies often arrange professional inspectors to use high-precision micrometers or inner diameter micrometers or even use three-coordinate measuring instruments to do 100% testing and confirmation, but such operations are low in efficiency and high in cost.

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