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Method for machining T-shaped bolt

A processing method and technology of bolts, applied in the direction of bolts, threaded fasteners, connecting components, etc., can solve the problems of easy rust and corrosion, breakage or cracks, and the formation of accident sources, etc., and achieve high bolt precision, moderate hardness, and improved strength Effect

Active Publication Date: 2015-05-06
ANHUI LIUFANG ZHONGLIAN MECHANICAL SHARE
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  • Summary
  • 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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Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be further described in conjunction with the following examples:

[0018] T-shaped bolt processing method, the processing steps include:

[0019] a. For casting T-shaped rod blanks, the weight percentage of each chemical composition of the control rod blanks should meet the following requirements: C 0.28~0.35, Mn 0.25~0.35, V 0.05-0.09, Si 0.15~0.35, W 0.01-0.04 , P≤0.025, S≤0.035, Ni 0.55~1.20, Co 0.35~0.45, Sb 0.20~0.30, Cu≤0.20;

[0020] b. Forging and forming the T-shaped bar after casting, the forging temperature is controlled at 750-800°C, and a thin layer of tree ash is covered on the inner wall of the cavity of the forging mold, and the particle size of the tree ash is controlled at 200-300 The number of times of forging shall not exceed 25, and the external thread of the bolt shall be turned with a precision lathe after forging;

[0021] c. Heat treatment, the first time is to heat the turned bolt external thread at 450-550°C for 10...

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Abstract

The invention discloses a method for machining a T-shaped bolt. The method comprises the following steps of: a) casting a T-shaped rod material blank and controlling the weight percentage of all chemical components of the rod material blank to ensure that the rod material blank comprises 0.28 to 0.35 percent of C, 0.25 to 0.35 percent of Mn, 0.05 to 0.09 percent of V, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, 0.55 to 1.20 percent of Ni, 0.35 to 0.45 percent of Co, 0.20 to 0.30 percent of Sb and less than or equal to 0.20 percent of Cu; according to the method for machining the T-shaped bolt, the bolt is machined by a cold extruding process, so that the intensity of the bolt is improved, the hardness value and the intensity value required by a 12.9 high-intensity bolt can be acquired, and the delayed fracture and the fatigue crack of the bolt under high intensity can be avoided; and during use, the bolt is reliable in connection, is not prone to break, and meets the using requirements of all industries in society on the high-intensity bolt; and the service life of the bolt is prolonged.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a T-shaped bolt processing 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. Contents of the invention [0003] The purpose of the present invention is to avoid the deficiencies in the prior art, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/44C23F17/00C21D8/00B23P15/00
Inventor 王立新
Owner ANHUI LIUFANG ZHONGLIAN MECHANICAL SHARE
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