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Bolt machining method

A processing method and bolt technology, applied in the field of bolt processing, can solve the problems of easy rust corrosion, fracture or crack, formation of accident sources, etc., to achieve the effect of not easy to break, improve plastic toughness and delayed fracture resistance, and meet the needs of use.

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

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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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Examples

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Comparison scheme
Effect test

Embodiment Construction

[0018] The present invention will be further described below in conjunction with embodiment.

[0019] The invention discloses a bolt processing method, and the processing steps include:

[0020] 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 0.28~0.34, Mn 0.32~0.43, V 0.18~0.25, 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, Mo 0.15~0.35, the balance is iron;

[0021] S2: Carry out forging and forming processing on the rod blank, the forging temperature is: 650-700°C, and the number of forging times is not more than 20;

[0022] S3: For the forged bar material, the thread of the bar is rolled into shape by a reciprocating thread rolling machine;

[0023] S4: heat treatment, heat the threaded end of the bolt at 500°C for 60 minutes for the first time, then raise the furnace temperature to 900°C, keep heating for 30 minutes, then r...

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Abstract

The invention discloses a 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 comprises the followingchemical components of, by weight, 0.28-0.34% of C, 0.32-0.43% of Mn, 0.18-0.25% 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, 0.15-0.35% of Mo and the balance iron. A bolt produced by the 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, breakage is 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 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 invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/04C22C38/02C22C38/12C22C38/08
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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