Processing method of high-strength bolts

A technology of high-strength bolts and processing methods, applied in the field of bolt processing, can solve problems such as breakage or cracks, easy rust and corrosion, and formation of accident sources, so as to achieve the effect of improving strength, not easy to break, and meeting the needs of use
CN101890618AActive Publication Date: 2010-11-24EAGLE METALWARE
4 Cites 96 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
EAGLE METALWARE
Publication Date
2010-11-24

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

The invention relates to a processing method of bolts, in particular to a processing method of high-strength bolts. SCM440 and 42CrMoVNb materials are adopted for producing the high-strength bolts. The method is characterized by selecting materials, spheroidizing the materials, acid cleaning the materials and drawing wires from the materials until the materials retract to the required diameter, carrying out extrusion molding on the materials 3-4 times on a multi-station cold forging machine to form the required bolt heads and shanks, carrying out rolling to obtain the required threads and thread length and realizing the required hardness and strength through thermal processing and quench tempering. The processing method in which the cold extruding process of the invention is adopted improves the strength of the bolts, achieves the hardness and strength required by the 12.9-class and 14.9-class high-strength bolts, solves the problems of delayed fracture and fatigue fracture of the bolts under high strength, ensures the bolts to be reliably connected and not to be easily fractured during use, prolongs the lives of the bolts and meets the use requirements of various industries in the society for the high-strength bolts.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a bolt processing method, especially a high-strength bolt processing method. Background technique

[0002] High-strength bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and forming. The strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turn and rod breakage occur during use, which is very harmful to industrial production. . Therefore, it plays an important role in the development of technology and economy to study and improve the production method of high-strength bolts to ensure the quality stability of high-strength bolts. In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents.

[0003] In view of this, it is necessary to provide a processing method for high-strength bolts to produce more corrosion-resi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More