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High intensity alloyed steel linkage rod deep cooling embrittlement bulge-breaking process

An alloy steel, high-strength technology, applied in the direction of connecting rods, shafts and bearings, mechanical equipment, etc., can solve the problems that the connecting rods of high-power engines cannot be broken by expansion technology

Inactive Publication Date: 2008-11-19
CHANGCHUN EQUIP TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Provide a high-strength alloy steel connecting rod cryogenic embrittlement expansion breaking process, which can solve the problem that the expansion breaking process cannot be used in the production of high-power engine connecting rods

Method used

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  • High intensity alloyed steel linkage rod deep cooling embrittlement bulge-breaking process
  • High intensity alloyed steel linkage rod deep cooling embrittlement bulge-breaking process
  • High intensity alloyed steel linkage rod deep cooling embrittlement bulge-breaking process

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Embodiment 1

[0024] like Image 6 , 7 As shown, wherein, 1 is the connecting rod, 2 is the expansion head, 3 is the expansion sleeve, and 4 is the back pressure spring.

[0025] 1. Connecting rod bursting—brittle deformation

[0026] The connecting rod bursting processing technology is based on the fact that the connecting rod material itself can achieve brittle deformation, while the high-strength alloy steel used for the high-power engine connecting rod cannot achieve brittle deformation by conventional means, which is also the connecting rod bursting technology. The main reason why it cannot be popularized in the processing technology of high-power engine connecting rods. The key technology adopted in the invention is to carry out liquid nitrogen cryogenic cooling on the connecting rod, which can realize the brittle deformation of the high-strength alloy steel.

[0027] 2. Solution

[0028] Through process tests, the plastic deformation of the separation surface of the high-strength...

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Abstract

The invention provides a process for deep-cooling, embrittling and broken-expanding of a connecting rod of high-rigid alloy steel, relating to an improvement of the process for processing engine components. The process comprises the following steps of: a. putting the connecting rod in liquid nitrogen for deep cooling for more than 5 minutes; basically deep cooling of the connecting rod to a test piece core part after ending of heat exchange; and measuring temperature at a fracture of the cracked test piece same as surface temperature of the test piece; b. keeping the deep cooling temperature to be lower than 156 DEG C below zero; c. placing an expanding sleeve in a macropore of the connecting rod and fixing the connecting rod on an operating board of a pressure machine, and punching the expanding sleeve by an expanding head to expand the connecting rod to be broken. The process has the advantages of changing tractility of the connecting rod of a high-power engine, and ensuring radically no conversion of mechanical performance before deep cooling and after deep cooling through utilizing the deep cooling technology. The technology is popularized and used in the high-power engine manufacture field of our country, which can combine seven or ten steps of key steps of the process for producing the connecting rod into one or two steps, thereby reducing much precision equipment for carrying out precise broaching and form grinding and so on.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing and relates to an improvement of an engine component processing technology. Background technique [0002] The connecting rod is the component that transmits the kinetic energy of the linear motion of the piston to the crankshaft. The manufacturing precision and quality of the connecting rod have a great influence on the engine. The connecting rod cracking process is a new technology in the field of connecting rod processing. As an advanced manufacturing technology, it has been widely used in the automotive industry and gradually replaced the traditional processing technology, becoming a major trend in the connecting rod processing industry . However, this technology has not been used in the processing of high-power engine connecting rods. [0003] The connecting rod processed by traditional technology is as follows figure 1 , 2 As shown, the big head hole of the connecting rod m...

Claims

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Application Information

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IPC IPC(8): F16C7/02
Inventor 刘劲松李焕东张维杰聂凤明王大森吴庆堂胡宝共崔文波闫晓丽
Owner CHANGCHUN EQUIP TECH RES INST
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