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Forging method of anchor bolts

A technology of anchor bolts and bolts, which is applied in the direction of bolts, manufacturing tools, threaded fasteners, etc., can solve the problems of easy rust and corrosion, breakage or cracks, and the formation of accident sources, and achieve high bolt precision, good plasticity, and improved The effect of tensile strength

Active Publication Date: 2016-05-11
NANTONG QIANQIANHUI CHEM
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  • 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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Embodiment Construction

[0019] The present invention will be further described in conjunction with the following examples:

[0020] The forging method of anchor bolts, the processing steps include:

[0021] 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: C0.25~0.35, Mn0.15~0.25, Si0.15~0.35, W0.01- 0.04, 0.015≤P≤0.025, 0.015≤S≤0.035, Ni0.15~0.20, Zn0.025~0.045, Sn0.02~0.03, Cr≤0.02, the balance is iron;

[0022] b. Carry out forging and forming processing on the rod material after casting. The forging temperature is controlled at 600-650°C. A thin layer of plant ash is covered on the inner wall of the cavity of the forging mold. The particle size of the plant ash is controlled at 200-300 mesh. The number of times is not more than 25 times. After forging and forming, the rod material is pushed in through the two tooth plates of the reciprocating thread rolling machine, and...

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PUM

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Abstract

The invention discloses a forging method for a foundation bolt. The forging method comprises the following forging steps of: a, preparing rod blanks by a forging process, controlling the chemical components of the rod blanks to satisfy the following requirements in percentage by weight: 0.25%-0.35% of C, 0.15%-0.25% of Mn, 0.15%-0.35% of Si, 0.01%-0.04% of W, P being not less than 0.015% and not more than 0.025%, S being not less than 0.015% and not more than 0.035%, 0.15%-0.20% of Ni, 0.025%-0.045% of Zn, 0.02%-0.03% of Sn, not more than 0.02% o Cr, and the balance of iron. According to the forging method for the foundation bolt disclosed by the invention, the bolt is machined by adopting a cold extrusion process, the strength of the bolt is improved, the needed hardness value and strength value of the 12.9 high-strength bolt are achieved, and delayed fracture and fatigue fracture of the high-strength bolt are solved; and moreover, during the using process, the foundation bolt is reliable in connection and not easy to break, so that the service life of the bolt is prolonged, and the using needs of the high-strength bolt in various industries of the society are satisfied.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a forging method for anchor bolts. Background technique [0002] Anchor 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 anchor 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 method for processing anchor bolts to produce anchor bolts with higher corrosion r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C21D9/00C21D6/04B21K1/44
Inventor 王立新
Owner NANTONG QIANQIANHUI CHEM
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