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Processing method for high-class bolt

A processing method and high-level technology, applied in the direction of bolts, metal processing equipment, threaded fasteners, etc., can solve problems such as fractures or cracks, formation of accident sources, easy rust and corrosion, etc., to achieve moderate hardness, improve strength, and not easy to broken effect

Active Publication Date: 2013-04-10
ANHUI LIUFANG ZHONGLIAN MECHANICAL SHARE
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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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  • Processing method for high-class bolt

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Embodiment Construction

[0022] The present invention will be further described in conjunction with the following examples:

[0023] A processing method for high-grade bolts, the processing steps include:

[0024] a. Casting rod blank, the weight percentage of each chemical composition of the control rod blank 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, Co 0.65~0.95, Sn 0.20~0.30, Cu≤0.20;

[0025] b. The rod material after casting is pickled; forged according to the size requirements of the bolts, the forging temperature is controlled at 850-800°C, and a thin layer of fly ash is covered on the inner wall of the forging mold cavity, and forged not more than 20 times;

[0026] c. Heat treatment

[0027] The first time is to quench the external thread of the forged bolt with quenching oil at 750°C±10°C, then temper the quenched bolt at 500°C for 30 minutes, and then take it out of the tempering furnace Pu...

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Abstract

The invention discloses a processing method for a high-class bolt. The processing method comprises the following steps: a) casting a rod blank and controlling the weight percent of all chemical components of the rod blank as follows: 0.27-0.34% of C, 0.45-0.65% of Mn, 0.05-0.15% of V, 0.15-0.35% of Si, 0.01-0.04% of W, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 1.55-2.00% of Ni, 0.65-0.95% of Co, 0.20-0.30% of Sn and less than or equal to 0.20% of Cu. According to the processing method for the high-class bolt provided by the invention, a cold extrusion process is adopted for processing the bolt, so that the strength of the bolt is increased, the hardness value and strength value required by the bolt with the strength being 12.9 are achieved, the problems of delay breakage and fatigue breakage of the bolt under high strength are solved, the connection is reliable during a use process, the bolt is difficult to break, the service life of the bolt is prolonged and the use requirement for the high-strength bolt in various industries is met.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a high-grade bolt processing method. Background technique [0002] High-grade 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-grade 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-grade bolts to produce more corrosion-resistant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21K1/44C22C38/12C21D8/00
Inventor 王立新
Owner ANHUI LIUFANG ZHONGLIAN MECHANICAL SHARE
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