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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

Active Publication Date: 2010-11-24
EAGLE METALWARE
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Problems solved by technology

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

Method used

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  • Processing method of high-strength bolts

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Embodiment 1

[0032] The processing method of high-strength bolts can manufacture 14.9 and 12.9 grade bolts. First of all, in the selection of materials, it is necessary to ensure the realization of the tensile strength, hardness value, yield strength, elongation and shrinkage that must be achieved by high-strength bolts, and achieve various indicators through non-cutting cold extrusion processing, 12.9 / 14.9 high strength The processing steps of bolts are as follows:

[0033] 1. Material selection

[0034] The material is selected as the plate element material, with SCM440 and SCM435 to produce 12.9-grade bolts, and 42CrMoVNb to produce 14.99-grade high-strength bolts.

[0035] Selecting a correct and suitable material is the prerequisite for measuring the comprehensive mechanical properties of high-strength fasteners. In order to improve the tensile strength, hardness, yield strength, elongation after fracture, and reduction of area of ​​high-strength bolts, this method adopts Baosteel SC...

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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.

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

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Application Information

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IPC IPC(8): B23P15/00
Inventor 王友良
Owner EAGLE METALWARE
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