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High Strength Bolt Forging Method

A technology of high-strength bolts and bolts, applied in the direction of manufacturing tools, furnace types, heat treatment furnaces, etc., can solve the problems of easy rust and corrosion, fracture or cracks, and the formation of accident sources, and achieve high bolt precision, good plasticity, and improved resistance The effect of tensile strength

Active Publication Date: 2016-12-21
NANTONG QIANQIANHUI CHEM
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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

Experimental program
Comparison scheme
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Embodiment Construction

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

[0019] The high-strength bolt forging method, 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 0.15~0.25, Si 0.15~0.35, W 0.01-0.04, 0.015≤ P≤0.025, 0.015≤S≤0.035, Ni 0.15~0.20, Ba 0.025~0.045, Sn 0.02~0.03, Mg≤0.02, the balance is iron;

[0021] b. Carry out forging and forming processing on the rod material after casting and forming, the forging temperature is controlled at 630-680°C, and a thin layer of graphite powder is covered on the inner wall of the cavity of the forging mold, and the particle size of the graphite powder is controlled at 200-300 mesh, The number of forging times is not more than 25 times, and the outer thread of the bolt is turned by using a precision lathe after forging;...

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PUM

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Abstract

The invention discloses a method for forging a high-strength bolt. The method comprises the following steps of: a, manufacturing a rod blank through a casting process, and controlling the weight percentage of each chemical component of the rod blank to meet the following requirements: 0.28 to 0.35 percent of C, 0.15 to 0.25 percent of Mn, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, more than or equal to 0.015 and less than or equal to 0.025 percent of P, more than or equal to 0.015 and less than or equal to 0.035 percent of S, 0.15 to 0.20 percent of Ni, 0.025 to 0.045 percent of Ba, 0.02 to 0.03 percent of Sn, less than or equal to 0.02 percent of Mg and the balance of iron; and b, forging a cast rod at the temperature of between 630 and 680 DEG C for not more than 25 times, wherein a thin layer of graphite powder is coated on the inner wall of an impression of a forging die, and the granularity of the graphite powder is controlled to be 200 to 300 meshes; and turning an external thread of the bolt by using a precision lathe after forging. According to the method for forging the high-strength bolt, the bolt is machined by adopting a cold extrusion 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 are achieved, the problems of delayed fracture and fatigue fracture of the bolt under high strength are solved, the bolt is reliable in connection during use and difficult to break, the service life of the bolt is prolonged, and the using requirement of each industry in the society for the high-strength bolt is met.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a high-strength bolt forging method. Background technique [0002] High-strength 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-turn and rod breakage 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 processing method for high-strength bolts to produce higher-strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B21J5/06C22C38/12C21D1/18C21D9/00C23C22/07
Inventor 王立新
Owner NANTONG QIANQIANHUI CHEM
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