Processing technology for high-strength bolt used for steel net frame bolt ball node

Abstract

The invention discloses a processing technology for a high-strength bolt used for a steel net frame bolt ball node, which belongs to a processing technology for a high-strength connecting piece. The high-strength bolt is processed by taking 40Cr as a billet by less or non cutting including three times of cold extrusion forming and one time of hot forging forming, wherein the first time of cold extrusion forming is screw forming, the second time of cold extrusion forming is upper screw thread section forming, the third time of cold extrusion forming is thread forming and the hot forging formingis bolt rail forming. The invention mainly adopts the cold extrusion process for bolt production, improves the strength of the bolt, optimizes the production process of the bolt, overcomes the delayfracture and fatigue fracture of the bolt under high strength, ensures that the bolt is not easy to fracture in the use process and reliably connected, prolongs the service life of the bolt and can more meet the use requirement for the high-strength bolt used for the steel net frame bolt ball node in modern society.

Description

technical field [0001] The invention relates to a processing technology of a high-strength connecting piece, in particular to a processing technology of a high-strength bolt used for a steel grid frame bolt ball joint. 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 premi...

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