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Method for machining connection rod bolt of diesel engine

A processing method and diesel engine technology, applied in bolts, metal processing equipment, connecting components, etc., can solve the problems of accident source, easy rust corrosion, fracture or crack, etc., and achieve the effect of improving strength, not easy to break, and moderate hardness

Inactive Publication Date: 2013-05-08
佛山顺恒鑫科技实业有限公司
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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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Embodiment Construction

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

[0020] A method for processing connecting rod bolts of a diesel engine. The processing steps include:

[0021] a. The weight percentage of each chemical composition of the rod material blank and the control rod material blank should meet the following requirements: C 0.28~0.32, Mn 0.35~0.45, V 0.05-0.15, 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, Sn 0.20~0.30, Cu≤0.20;

[0022] b. Carry out forging and forming processing on the rod material after casting. The forging temperature is controlled at 850-800°C. A thin layer of fly ash is covered on the inner wall of the forging mold cavity. The number of forgings is not more than 20 times. After forming, use a precision lathe to turn the external thread of the bolt;

[0023] c. Heat treatment, the first time is to heat the turned outer thread of the bolt at 400-450°C for 10-12 hours, then raise the t...

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Abstract

The invention discloses a method for machining a connection rod bolt of a diesel engine. The method comprises the following steps of: manufacturing a 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 0.32 percent of C, 0.35 to 0.45 percent of Mn, 0.05 to 0.15 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 Sn and less than or equal to 0.20 percent of Cu. According to the method for machining the connection rod bolt of the diesel engine, 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 which are required by a 12.9 high-intensity bolt can be acquired, and the delayed fracture and fatigue crack of the bolt under high intensity can be overcome; the bolt is reliable in connection during use, and is not prone to break and crack; the service life of the bolt is prolonged; and the using requirements of all industries in society on the high-intensity bolt can be met.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a processing method for connecting rod bolts of a diesel engine. Background technique [0002] The connecting rod bolts of diesel engines 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. big. 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 method for ...

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 佛山顺恒鑫科技实业有限公司
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