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Method for forging torsional shear type high-strength bolt

A high-strength bolt and bolt technology, applied in the direction of bolts, threaded fasteners, connecting components, etc., can solve the problems of easy rust, corrosion, fracture or crack, and the formation of accident sources, and achieve high bolt accuracy, moderate hardness, and improved The effect of tensile strength

Active Publication Date: 2015-07-22
ANHUI LIUFANG ZHONGLIAN MECHANICAL SHARE
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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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Comparison scheme
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Embodiment Construction

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

[0019] The forging method of torsion shear type high-strength bolts, the processing steps include:

[0020] a. The rod material blank is prepared by the casting process, and the weight percentage of each chemical composition of the control rod material blank shall 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, Zn 0.025~0.045, Sn 0.02~0.03, Cr≤0.02, the balance is iron;

[0021] b. Forging and forming the rod material after casting, the forging temperature is controlled at 600-650℃, the inner wall of the forging die is covered with a thin layer of plant ash, and the particle size of the plant ash is controlled to 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,...

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PUM

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Abstract

The invention discloses a method for forging a torsional shear type high-strength bolt. The method comprises the step of: manufacturing a rod blank by a casting process, wherein the rod blank comprises the following chemical ingredients in percentage by weight: 0.25 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, less than or equal to 0.025 and more than or equal to 0.015 percent of P, less than or equal to 0.035 and more than or equal to 0.015 percent of S, 0.15 to 0.20 percent of Ni, 0.025 to 0.045 percent of Zn, 0.02 to 0.03 percent of Sn, less than or equal to 0.02 percent of Cr and the balance of Fe. According to the method for forging the torsional shear type high-strength bolt, the bolt is machined by using a cold extrusion process, so that the strength of the bolt is enhanced, a hardness value and a strength value which are required by the high-strength bolt of which the strength is 12.9 are reached, and the delayed breakage and fatigue breakage of the bolt are avoided under high strength; and the torsional shear type high-strength bolt is reliable in connection and difficult to break in the using process, so that the service life of the bolt is prolonged, and the using demand of each industry in society on the high-strength bolt is met.

Description

Technical field [0001] The invention relates to a processing method of bolts, in particular to a forging method of torsion shear type high-strength bolts. Background technique [0002] High torsion shear 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 in use, unsafe phenomena such as U-turn and rod breakage may occur, which is very harmful to industrial production. . Therefore, research and improvement of high torsion shear production methods to ensure the quality stability of high torsion shear bolts play an important role in the development of technology and economy. In addition, when the bolt is in a relatively humid environment, it is easy to rust and corrode, which will eventually lead to fracture or cracks, forming a potential source of accident. [0003] In view of this, it is necessary to provide a method for processing high torsional sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/44
Inventor 王立新
Owner ANHUI LIUFANG ZHONGLIAN MECHANICAL SHARE
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