Portable device for trimming local high point of internal thread

Abstract

The invention relates to a portable device for trimming a local high point of an internal thread. The portable device is composed of a rotary shaft (1), a spring (2), an eccentric bushing (3), a threaded shaft (4), an eccentric screw (5), a bearing (6), a spacer (7), a locknut (8), a pneumatic motor (9), a detachable threaded shaft (10) and a grinding wheel (11). The portable device is characterized in that the portable device is simple in structure and convenient to use and carry. The device is positioned by using a processed internal thread and a grinding head is fed circumferentially and axially by taking a thread of the processed internal thread as guidance and reverse distance, so that the mean pitch of the trimmed internal thread is matched with an original pitch of the thread. Ground by the grinding wheel, the counteraction force is small, and the demand on rigidity of device is relatively low. According to an inclination angle beta generated by assembling the eccentric bushingand the threaded shaft, the mean screw line of the corrected internal thread is matched with the screw line of an original thread. The cross-section shape of the grinding wheel is as same as a threadform, so that it is easier to control the thread form.

Description

technical field [0001] The invention relates to the technical field of internal thread repair, in particular to a portable device for trimming local high points of internal threads. Background technique [0002] Thread is one of the most common features in mechanical parts. Many structural parts are connected by thread. During the operation of the equipment, the thread may fail due to various reasons. At this time, the parts with thread failure need to be replaced or replaced. Trim component threads. However, in some cases, such as: the internal thread on the pressure vessel and the equipment body that cooperates with the large flange cannot consider replacing its own parts, and can only try to repair the internal thread. [0003] For the problem of thread failure, the traditional solution is to re-tapping the failed internal thread, eccentric drilling, etc., and then replace the corresponding matching parts, but re-tapping requires increasing the diameter of the bolt. It ...

AI Technical Summary

Problems solved by technology

However, in some cases such as: the internal thread on the pressure vessel and equipment body that cooperates with large flanges cannot consider replacing its own parts, and can only try to trim the internal thread

[0003] For the problem of thread failure, the traditional solution is to re-tapping the failed internal thread, eccentric drilling, etc., and then replace the corresponding matching parts, but re-tapping requires increasing the diameter of the bolt. It is feasible, but ectopic drilling requires high structural flexibility, and most mechanical parts cannot be processed by the above method, which leads to their overall scrapping due to failure of individual internal threads, shortening product life, and increasing maintenance and use costs

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