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Preparation method of fastening bolt for automobile wheel

A technology for tightening bolts and wheels, applied in the direction of bolts, threaded fasteners, manufacturing tools, etc., can solve the problems of accident source, fracture or crack, easy rust and corrosion, etc., to improve tensile strength, good plasticity, High precision bolt effect

Active Publication Date: 2013-05-08
湖北友谦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

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Embodiment Construction

[0020] The present invention will be further described in conjunction with the following examples:

[0021] A method for preparing fastening bolts for automobile wheels, the processing steps comprising:

[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, Ni 1.55~2.00, 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 temperature, and use the upsetting force to make the rod material form the head and rod size required by the bolt; use a precision lathe to cut the rod m...

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PUM

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Abstract

The invention discloses a preparation method of a fastening bolt for an automobile wheel. The preparation method comprises the following processing steps: a, casting a raw material, wherein the raw material comprises the following chemical components in percentage by weight: 0.4 to 0.8% of C, 0.02 to 0.05% of Si, 0.18 to 0.21% of Mn, 0.16 to 0.18% of P, 0.05 to 0.07% of S, 0.05 to 0.15% of Cr, 0.05 to 0.12% of Ti, 0.11 to 0.13% of Cu, 0.01 to 0.02% of Al, 0.02 to 0.03% of Mg, and the balance of iron; and b, scouring the casted and formed rod material; carrying out line drawing on the rod material according to the requirement of the line diameter of the bolt, so that the rod material shrinks to the line diameter required by the bolt; cutting the rod material which is shrunk to the required line diameter to the length required by the bolt; placing the cut rod material into a die cavity at normal temperature; and using upsetting force to enable the dimensions of a head part and a rod part of the rod material to reach the requirements of the bolt. According to the preparation method of the fastening bolt for the automobile wheel, the bolt is processed by cold extruding process, so that the strength of the bolt is improved, the hardness value and the strength value required by the 12.9 high-strength bolt can be realized, and the delayed fracture and the fatigue fracture of the bolt at high strength can be solved; the fastening bolt is reliable in connection and hardly broken during use, prolongs the service life, and meets the usage demand of various industries in the society to high-strength bolts.

Description

technical field [0001] The invention relates to a method for processing bolts, in particular to a method for preparing fastening bolts for automobile wheels. Background technique [0002] Fastening bolts for automobile wheels 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-turn and rod breakage occur during use, which is harmful to industrial production. very big. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C21D9/00C23C8/66B21K1/44B23G1/02B23P15/00
Inventor 王立新
Owner 湖北友谦汽车零部件有限公司
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