High-strength bolt machining method

A technology of high-strength bolts and processing methods, applied in the field of bolt processing, can solve the problems of accident sources, easy rust and corrosion, fracture or cracks, etc., and meet the needs of use, not easy to break, improve plastic toughness and delayed fracture resistance Effect

Inactive Publication Date: 2019-03-29
重庆旺达汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The present invention will be further described below in conjunction with embodiment.

[0020] The invention discloses a method for processing high-strength bolts. The processing steps include:

[0021] S1: The rod blank is obtained through the casting process, and the weight ratio of each chemical composition of the rod blank should meet the following requirements: C 0.28~0.32, Mn 0.32~0.45, V 0.05~0.15, Si 0.15~0.25, W 0.01 ~0.03, P≤0.015, S≤0.015, Ni 0.50~1.20, Sn 0.15~0.25, Cu 0.15~0.25, Mo 0.15~0.35, the balance is iron;

[0022] S2: Copper-plated and lubricated the bar blank in sections;

[0023] S3: Put the bar blank into the mold cavity, and use the upsetting force to form the bar into the head and bar dimensions required by the bolt;

[0024] S4: For the rod material after cold heading, the thread of the rod is rolled into shape by a reciprocating thread rolling machine;

[0025] S5: heat treatment, heat the threaded end of the bolt at 500°C for 60 minutes f...

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PUM

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Abstract

The invention discloses a high-strength bolt machining method. The method comprises the step of S1, a rod blank is prepared through a casting process, wherein the rod blank is controlled to comprisesthe following chemical components of, by weight, 0.28-0.32% of C, 0.32-0.45% of Mn, 0.05-0.15% of V, 0.15-0.25% of Si, 0.01-0.03% of W, less than or equal to 0.015% of P, less than or equal to 0.015%of S, 0.50-1.20% of Ni, 0.15-0.25% of Sn, 0.15-0.25% of Cu, 0.15-0.35% of Mo and the balance iron. A bolt produced by the high-strength bolt machining method reaches the hardness value and the strength value which are required by the high-strength bolt, the delay fracture and the fatigue fracture problems of the bolt under the high strength are solved, during use, connection is reliable, breakageis not prone to occurrence, the service life of the bolt is prolonged, and the use requirements of all industries in the society on the high-strength bolt are met.

Description

technical field [0001] The invention relates to the technical field of bolt processing, in particular to a high-strength bolt processing method. Background technique [0002] Bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and 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. 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. Contents of the invention [0003] Aiming at the deficiencies of the above technologies, the object of the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/04C22C38/02C22C38/12C22C38/08C22C38/16
Inventor 张叶黄宋挺金宋炜杰
Owner 重庆旺达汽车零部件有限公司
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