Preparation method of fastening bolt

A technology for tightening bolts and bolts, applied in the field of preparation of tightening bolts, can solve the problems of easy rust and corrosion, fracture or cracks, and the formation of accident sources, and achieves the effects of not easy to break, moderate hardness, and improved strength

Inactive Publication Date: 2020-06-09
余姚市晶易光伏发电有限公司
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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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Embodiment Construction

[0020] The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations.

[0021] The preparation method of fastening bolts, the processing steps include:

[0022] a. Casting rod material, the weight percentage of each chemical composition of the control rod material should meet the following requirements: C 0.27~0.34, Mn 0.45~0.65, V 0.05-0.15, Si 0.15~0.35, W 0.01-0.04, P≤0.025 , S≤0.025, Ni1.55~2.00, Cr 0.65~0.95, Mo 0.20~0.30, Cu≤0.20;

[0023] 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 te...

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PUM

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Abstract

The invention discloses a preparation method of a fastening bolt. The preparation method comprises the following processing steps of a, casting a rod material, and controlling the following chemical components in percentage by weight of 0.4%-0.8% of C, 0.02%-0.05% of Si, 0.18%-0.21% of Mn, 0.16%-0.18% of P, 0.05%-0.07% of S, 0.05%-0.15% of Cr, 0.05%-0.12% of Ti, 0.11%-0.13% of Cu, 0.01%-0.02% of Al, 0.02%-0.03% of Mg and the balance iron; and b, carrying out acid pickling treatment on the rod material subjected to casting molding, conducting wire drawing according to the wire diameter requirement of the bolt so that the rod material is shrunk to the wire diameter required by the bolt, cutting off the rod material with the shrunk wire diameter to the length needed by the bolt, placing the cut-off rod material in a mold cavity at the normal temperature, and using upsetting force to enable the rod material to form the head and rod part sizes needed by the bolt. According to the preparation method of the fastening bolt, a cold extrusion process is adopted for bolt machining, the strength of the bolt is improved, the hardness value and the strength value needed by the 12.9 high-strengthbolt are achieved, delayed fracture and fatigue fracture of the bolt under high strength are avoided, connection is reliable and not prone to fracture in the using process, the service life of the bolt is prolonged, and the use requirements of various industries in society on the high-strength bolt are met.

Description

technical field [0001] The invention relates to a method for processing bolts, in particular to a method for preparing fastening bolts. Background technique [0002] Fastening 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. [0003] In view of this, it is necessary to provide a fastening bolt to produce a more corrosion-resistant high-stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/46C22C38/02C22C38/44C22C38/42C21D1/18C21D9/00C23C8/66C23C22/68B23P15/00
CPCB23P15/00C21D1/18C21D9/0093C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C23C8/66C23C22/68
Inventor 李晓毛
Owner 余姚市晶易光伏发电有限公司
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