Cup head square neck bolt

Abstract

The invention provides a cup head square neck bolt. The cup head square neck bolt can realize one-time cold extrusion forming; the cup head square neck bolt is high in precision, and comprises a hemispherical round head end and a cylindrical body; the ratio of the thickness of the hemispherical round head end to the diameter of a bolt rod is moderate; and the ratio between a square neck column andthe bolt column body is also moderate, so that the service life of a mold is improved. All the impact received by the cup head square neck bolt can be gathered onto a shock-absorbing bag, and the impact can be completely eliminated through the deformation of the shock-absorbing bag and the change of gas flow paths inside the shock-absorbing bag, so that the impact is not transmitted to the bolt rod. When the cup head square neck bolt is in connection, rubber bands filled in annular grooves in a surrounding manner are pressed, by the hole wall of a square hole, into the annular grooves due tothe elasticity of the rubber bands, and the gap between an anti-rotation block and the square hole is effectively filled. Therefore, the objectives of better anti-axial-rotation effect and reliable cooperation are realized; and in some violent working conditions, the square hole in a mounting seat is in elastic contact with the rubber bands arranged in a surrounding manner so as to effectively avoid abnormal sounds.

Description

technical field [0001] The invention relates to the technical field of bolt structures, in particular to a half-round head square neck bolt. Background technique [0002] As a mechanical part, a bolt is a cylindrical threaded fastener with a nut. It is a type of fastener consisting of a head and a screw. It needs to be matched with a nut to fasten and connect two hole parts. Bolts are widely used in all walks of life, but the requirements for bolt strength in different industries, such as aerospace, oil exploration and other fields, have higher requirements for bolt strength, but the bolts currently on the market are difficult to fully meet the requirements of all walks of life Moreover, the way to manufacture high-strength bolts is generally turning forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turns and rod fractures occur during use, which is very harmful to industrial production. [0003] When the half-round head square...

AI Technical Summary

Problems solved by technology

[0004] The function of the square neck bolt is to prevent the rotation of the shaft. It is generally connected with the mounting seat with a square hole. The side of the square neck bolt close to the nut has a square anti-rotation block. The anti-rotation block is generally matched with the square hole. Matching, when installing, after the screw end of the square neck bolt passes through the square hole, the anti-rotation block on the square neck bolt is placed in the square hole, and then the screw end is equipped with a nut to tighten. There is a gap in the matching square hole, which will produce abnormal noise in some severe working conditions, which will affect the insecurity of the equipment.

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