Cold heading formation technology of grid structure bolt

Abstract

The cold heading forming process of grid bolts disclosed by the present invention includes the steps of material preparation, raw material reformation, cold heading forming, groove milling, quenching, tempering, blackening treatment and post-treatment. The cold heading forming process of grid bolts provided by the invention solves the delayed fracture and fatigue fracture of bolts under high strength. It is not easy to break during use, and the connection is reliable, which improves the service life of bolts and can better meet the needs of today's society. The use of high-strength bolts for steel grid bolt ball joints is required.

Description

technical field [0001] The invention relates to a production method of bolts, in particular to a cold heading forming process of network frame bolts. Background technique [0002] High-strength bolts for steel grid bolt ball joints are commonly used fasteners in the machinery industry. The current processing method is generally formed by turning, and its strength is often difficult to guarantee. When the tensile strength exceeds a certain value, in the gap concentration Places such as the transition between the rod and the head or the root of the thread are likely to cause delayed fracture and fatigue fracture, which will seriously affect the quality of the project. In severe cases, it will cause safety accidents due to insufficient connection strength. Therefore, traditional high-strength The production process of bolts should be studied and improved to efficiently carry out mass production under the premise of ensuring its quality, so as to meet the extensive needs of the ...

AI Technical Summary

Problems solved by technology

[0002] High-strength bolts for steel grid bolt ball joints are commonly used fasteners in the machinery industry. The current processing method is generally formed by turning, and its strength is often difficult to guarantee. When the tensile strength exceeds a certain value, in the gap concentration Places such as the transition between the rod and the head or the root of the thread are likely to cause delayed fracture and fatigue fracture, which will seriously affect the quality of the project. In severe cases, it will cause safety accidents due to insufficient connection strength. Therefore, traditional high-strength Research and improve the production process of bolts, so as to efficiently carry out mass production under the premise of ensuring its quality, and meet the society's extensive needs for high-strength bolts for steel grid bolt ball joints