Forming dies for locking threads

Abstract

The invention discloses a forming die for a locking thread. The forming die comprises an upper die (21) and a lower die (22), wherein the upper die (21) can move up and down to be linked with a driving device; an arc surface (23) for extruding a thread is arranged on the bottom surface of the upper die (21); left and right symmetric arc surfaces (23) are arranged on the left and right sides of the lower die (22); the radius of the arc surface (23) of the upper die is the same as those of the left and right sections of arc surfaces (23) of the lower die (22); when the upper die (21) moves downwards to be closed with the lower die (22), the three sections of arc surfaces are positioned on the same circumferential surface. The forming die has the advantages that the position, where an external thread and an internal thread are matched, of a stud or a bolt is extruded and deformed by the surfaces of the die in a trisection manner to change the shape of an original ordinary thread, and when the changed thread is matched with the internal thread, the extruded and deformed part cannot smoothly pass, and forms special interference fit, so that a thread loosening prevention function is realized; the die is simple in structure and stable in machining performance, and has good anti-loosening effects, and the locking thread formed by the die for an internal thread of an engine body has unique advantages.

Description

technical field [0001] The invention relates to a part processing mold, in particular to a forming mold for locking threads. Background technique [0002] There is an existing Chinese invention patent with the application number CN200610142948.6 titled "Thread Forming Method, Thread Forming Device and Thread Forming Tool", which discloses a method of forming a threaded portion with an internal thread with respect to a metal plate with high operating efficiency. The thread forming device has: a thread forming cutter for forming a thread portion on the vehicle frame, a first motor for controlling the rotation of the thread forming cutter, and a second motor for controlling the advance and retreat of the thread forming cutter. In addition, the thread forming tool has a bottomed hole forming portion provided with a helical groove at the tapered tip portion, and a thread forming portion provided with the helical groove formed in connection with the bottomed hole forming portion. ...

AI Technical Summary

Problems solved by technology

But its disadvantage is that it lacks the processing of special anti-loosening section threads, and can only form ordinary threads, so its structure still needs to be improved.

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