Thread roll-forming process for large-specification bolt

Abstract

The invention provides a thread roll-forming process for a large-specification bolt, comprising the steps of S1, blank preparation: turning a guide slot in the surface of the large-specification bolt to be rolled; S2, equipment regulation: selecting thread roller equipment, respectively mounting a thread rolling wheel on each of a fixed shaft and a feed shaft of a thread roller, and then, fixing and locking the thread rolling wheels in the axial direction; and S3, thread rolling: placing the bolt in which the guide slot is turned in the step S1 between the two thread rolling wheels of the thread roller selected in the step S2, enabling the bolt to be close to the thread rolling wheel of the fixed shaft, and leaning the guide slot of the bolt into a cusp of the thread rolling wheel of the fixed shaft to begin to roll. The guide slot is turned in the bolt in the thread roll-forming process, the guide slot of the bolt is leaned into the cusp of the thread rolling wheel of the fixed shaft, and thus, a cusp of the thread rolling wheel of the feed shaft is kept to just fall into the corresponding guide slot of the bolt when the feed shaft feeds. The cusps of the rolling wheels are always limited in the guide slot of the bolt in the subsequent thread rolling, so that no winding phenomena can appear, and a required thread is rolled.

Description

technical field [0001] The invention relates to a thread rolling forming process for large-size bolts. Background technique [0002] There are two methods of thread processing: cutting forming and rolling forming. Due to the advantages of high production efficiency, good thread accuracy, material saving, and good metal flow at the bottom of the thread, this thread processing method has been widely used in bolt manufacturing. industry. [0003] We know that when thread rolling is formed, a pair of thread rolling wheels with the same helix angle as the bolt (thread) should be selected first. In this way, during the thread rolling process, the thread rolling wheel rotates and drives the blank to rotate under the action of radial pressure, and the indentation can be squeezed out on the surface of the blank by the cusp of the thread rolling wheel. When the blank and the roller are pure rolling , the helix angle of the indentation on the surface of the blank is the same as the h...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the existing method of rolling large-size threads is prone to chaotic fastening, the present invention provides a thread rolling forming process for large-size bolts

The present invention adopts a very shallow guide groove before the billet rolling (the requirements for the profile angle and half angle are not high), and then roll forming, the guide groove is formed according to the pitch of the bolt (with the helix angle of the corresponding specification) Corresponding to) car-made, so that in the subsequent rolling process, the tooth tip of the roller is always limited in the guide groove of the bolt, so that there will be no random buckle phenomenon, which solves this problem, and this method is simple and easy

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