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Preparation method of lengthened bolt

A technology for lengthening bolts and bolts, which is applied in the direction of bolts, metal processing equipment, manufacturing tools, etc., can solve the problems of easy rust and corrosion, breakage or cracks, and the formation of accident sources, etc., and achieve the effect of not easy to break, moderate hardness, and increased strength

Active Publication Date: 2013-05-08
重庆冠鹏机车部件有限公司
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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

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Effect test

Embodiment Construction

[0018] The present invention will be further described in conjunction with the following examples:

[0019] The preparation method of the elongated bolt is characterized in that the processing steps include:

[0020] a. The rod blank is obtained through the casting process, and the weight percentage of each chemical composition of the control rod blank should meet the following requirements: C 0.25~0.35, Mn 0.08~0.15, Si 0.05~0.15, W 0.01-0.04, 0.015≤ P≤0.025, 0.015≤S≤0.035, Ni 0.15~0.20, Zn 0.025~0.045, Sn 0.02~0.03, Cr≤0.02, the balance is iron;

[0021] b. The rod material after casting is pickled; according to the wire diameter requirements of the bolt, it is drawn to make the rod material shrink to the wire diameter required by the bolt; the rod material after shrinking the wire diameter Cut to the length required by the bolt, put the cut rod material into the mold cavity at room temperature, and use the upsetting force to make the rod material form the head and rod size...

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PUM

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Abstract

The invention discloses a preparation method of a lengthened bolt. The preparation method is characterized by comprising the following processing steps of: a, preparing a rod blank through a casting technology, wherein the rod blank comprises the following chemical components in percentage by weight: 0.25%-0.35% of C, 0.08%-0.15% of Mn, 0.05%-0.15% of Si, 0.01%-0.04% of W, no less than 0.015% and no more than 0.025% of P, no less than 0.015% and no more than 0.035% of S, 0.15%-0.20% of Ni, 0.025%-0.045% of Zn, 0.02%-0.03% of Sn, no more than 0.02% of Cr, and the balance of iron. The preparation method of the lengthened bolt disclosed by the invention has the beneficial effect of improving the strength of the bolt by processing the bolt through a cold extrusion process, the hardness value and the strength value required for a 12.9 high-strength bolt are achieved, the problems of delayed fracture and fatigue fracture of the bolt under high strength are solved, the bolt is reliable for connection and less prone to breaking in use, the service life of the bolt is prolonged, and the use requirement on the high-strength bolt in various industries in society is satisfied.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a preparation method of an elongated bolt. Background technique [0002] Extended 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 breaks occur during use, which is very harmful to industrial production. Therefore, researching and improving the production method of lengthened bolts to ensure the quality stability of high-strength bolts plays an important role in the development of technology and economy. 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 lengthening bolts to produce more corrosion-res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D9/00C21D6/04B21K1/44B23G1/02B23P15/00
Inventor 王立新
Owner 重庆冠鹏机车部件有限公司
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