Thread axis gauge and thread part processing technology thereof

Abstract

The invention relates to the technical field of threaded hole position accuracy detection, in particular to a thread axis gauge and a thread part processing technology thereof. The thread axis gauge comprises a thread part, a polished rod part and a mounting part which are sequentially connected, the polished rod part is cylindrical and is coaxial with the thread part, the thread part comprises a thread go end, a thread transition section and a thread not-go end which are sequentially arranged, the thread not-go end is connected with the polished rod part, the pitch diameter of the thread go end is d2 go, the pitch diameter of the thread not-go end is d2 not, and the pitch diameter of the thread transition section is gradually changed into the pitch diameter of the thread not-go end from the pitch diameter of the thread go end. According to the scheme, when the threaded part is screwed into the threaded hole, the axial clearance is continuously eliminated through the matching of the pitch diameters of the threads, the axial lead of the threads is found, and then detection is performed by matching with three coordinates, so that the position error of the threaded hole is judged.

Description

technical field [0001] The invention relates to the technical field of threaded hole position degree detection, in particular to a thread axis gauge and a thread part machining process thereof. Background technique [0002] Threaded connection is a relatively widely used connection method, so the detection of the position of the threaded hole is particularly important. At present, the position of the threaded hole is mainly detected by the following three methods: [0003] The first method is to use the three-coordinates to directly evaluate the points on the surface of the threaded hole, that is, to use the three-coordinate probe to collect points in the X and Y directions of the threaded inner hole, and fit it into a circle through the three-coordinate system software, and find The center of the circle is used to evaluate the positional degree with respect to the reference. This method has the problem of a large error in the point selection, because the probe may take th...

AI Technical Summary

Problems solved by technology

This method has the problem of large sampling errors, because the probe may obtain the maximum value or the minimum value when sampling the threaded inner hole, and the consistency of the sampling points is poor

[0004] The second method is to use the threaded mandrel for auxiliary measurement and evaluation, that is, to make the corresponding threaded mandrel according to the threaded hole specification, and the diameter of the mandrel is grouped according to the thread matching level. At present, the mandrels of each thread specification in the market are grouped as follows: 4 groups, screwed into the threaded holes in actual use, select the threaded mandrel with a small fit clearance according to the subjective judgment of the person, and then use the three coordinates to perform position evaluation and detection; this method has too many threaded mandrels, and the management It is confusing, and secondly, when using it, it is judged by human subjective consciousness to choose the matching gap, and there is a large human judgment error, which leads to the final result deviating from the actual size

However, this detection method has the difficulty of manufacturing comprehensive inspection tools and the problem that the accuracy of the inspection tool itself is out of tolerance. Secondly, this method can only judge whether the product position is qualified, and cannot judge the out-of-tolerance data of the specific direction position relative to the theoretical size.

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