Bolt thread rolling forming device

Abstract

The invention discloses a bolt thread rolling forming device which comprises a fixed die holder and a thread rolling movable die holder, a first thread rolling module is arranged on the thread rolling movable die holder, a second thread rolling module and a bolt head positioning mechanism are arranged on the fixed die holder, and machining die surfaces matched with each other are arranged on the first thread rolling module and the second thread rolling module respectively. The machining die face is provided with a thread forming die part and at least one annular concave extrusion forming die part. According to the invention, synchronous forming of the thread and the ring recess can be realized, the relative position precision of the thread and the ring recess is accurate and reliable, secondary forming of the ring recess is not needed, the production cost is reduced, and the product forming precision is improved. The bolt head positioning mechanism is arranged, so that the relative position precision of the bottom wall of the bolt head, the thread and the annular concave part is guaranteed, the carrying quality of the rear-end locking sleeve is controllable and stable, meanwhile, the rear-end assembling precision of the bolt assembly is guaranteed, and the qualified rate of the product quality is remarkably improved. And the machining die surface is skillful in design, and the gradual transition design enables the twisting stress to be more uniform.

Description

technical field [0001] The invention relates to a bolt thread rolling forming device, which belongs to the technical field of bolt forming. Background technique [0002] Bolts are a very popular fastener with a wide range of applications and are used for bolt assembly of various products. [0003] At present, there is an automobile fastening bolt. The bolt includes a bolt head and a bolt rod. The bolt head is provided with a concave locking groove, and the bolt rod is provided with a fastening thread and at least one annular recess located between the fastening thread and the bolt head. , The ring recess is mainly used for the mounting and locking of the locking sleeve, that is, after the bolts and the locking sleeve are assembled together, the outer peripheral wall of the locking sleeve is squeezed so that the deformation of the locking sleeve and the ring recess are between achieve locking. [0004] At present, when the bolt is formed, cold heading is generally used to f...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, aiming at the problem that the traditional thread and ring recess need to be processed step by step and the relative position accuracy of the thread, ring recess and bolt head is relatively poor, a bolt thread rolling forming device is proposed

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