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Production method of steel for automobile connecting rods

A production method and technology for automobile connecting rods, which are applied in steering tie rods, vehicle parts, steering mechanisms, etc., can solve the problems that cracking technology cannot be widely used, affect steel cracking processing performance, affect processing accuracy, etc., and achieve easy control and production costs. Low, the effect of improving the cracking performance

Active Publication Date: 2012-08-22
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the basis of the traditional cracked connecting rod forged steel JIS S50CVS1, Japan has developed a medium carbon steel S53CV with a uniformly distributed two-phase structure of ferrite and pearlite by increasing the content of Si and V in the steel to replace part of the Mn content. -FS, its strength and plasticity are greatly improved, and it has good fatigue resistance, but its cracking performance is poor. During the cracking process, the connecting rod deforms seriously, which affects the machining accuracy
The domestically developed steel for automotive engine connecting rods is mainly represented by 35MnVS. Its composition and production process are also aimed at obtaining a uniformly distributed structure of ferrite and pearlite to improve the strength and plasticity of the steel. Therefore, the plasticity during cracking processing Large deformation cannot be widely used in pyrolysis process
[0004] The above-mentioned prior art mainly adopts the traditional way of thinking, that is, to reduce the reticulation of ferrite in the metallographic structure of the steel, so that the ferrite and pearlite structures are evenly distributed in the steel to improve the strength and plasticity of the steel , but seriously affects the cracking processability of steel

Method used

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  • Production method of steel for automobile connecting rods
  • Production method of steel for automobile connecting rods

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Effect test

Embodiment 1

[0020] The chemical composition and percentage by weight that present embodiment adopts are: 0.35%C, 0.650%Si, 1.00%Mn, 0.050%S, all the other are Fe and unavoidable impurity production automobile connecting rod medium-carbon microalloy round steel, its step :

[0021] 1) Smelting and casting the forging blank into Φ35mm medium carbon micro-alloy round steel;

[0022] 2) Carry out induction heating, control the heating rate at 80°C / s, and the heating temperature at 1150-1160°C;

[0023] 3) Forging: First, open the billet, control the forging ratio at 1:2, forging temperature at 1120-1130°C, and control the forging time at 3 seconds; carry out die forging, control the die forging temperature at 1050-1060°C, and die forging time in 2 seconds;

[0024] 4) Carry out trimming, control the trimming temperature at 1000-1005°C, and the time is 2 seconds;

[0025] 5) Carry out air cooling, control the cooling rate at 5°C / s, and cool to 500-510°C. After cooling, control the ferrite n...

Embodiment 2

[0028] The chemical composition and percentage by weight that present embodiment adopts are: 0.37%C, 0.660%Si, 1.05%Mn, 0.045%S, all the other are Fe and unavoidable impurity production automobile connecting rod medium-carbon microalloy round steel, its step :

[0029] 1) Smelting and casting the forging blank into Φ50mm medium carbon micro-alloy round steel;

[0030] 2) Carry out induction heating, control the heating rate at 90°C / s, and the heating temperature at 1190-1200°C;

[0031] 3) Forging: First, open the billet, control the forging ratio at 1:4, forging temperature at 1180-1190°C, and control the forging time at 4 seconds; carry out die forging, control the die forging temperature at 1080-1090°C, and die forging The time is 3 seconds;

[0032] 4) Carry out edge trimming, and control the edge trimming temperature at 1040-1050°C for 3 seconds;

[0033] 5) Carry out air cooling, the cooling speed is controlled at 8°C / s, and cooled to 540-550°C. After cooling, the fer...

Embodiment 3

[0036] The chemical composition and percentage by weight that present embodiment adopts are: 0.38%C, 0.650%Si, 1.10%Mn, 0.055%S, all the other are Fe and unavoidable impurity production automobile connecting rod medium-carbon microalloy round steel, its step :

[0037] 1) Smelting and casting the forging blank into Φ65mm medium carbon micro-alloy round steel;

[0038] 2) Carry out induction heating, control the heating rate at 100°C / s, and the heating temperature at 1240-1250°C;

[0039] 3) Forging: First, open the billet, control the forging ratio at 1:5, forging temperature at 1220-1230°C, and control the forging time at 5 seconds; carry out die forging, control the die forging temperature at 1090-1100°C, and The time is 4 seconds;

[0040] 4) Carry out trimming, control the trimming temperature at 1035-1045°C, and the time is 4 seconds;

[0041] 5) Carry out air cooling, the cooling rate is controlled at 10°C / s, and cooled to 590-600°C. After cooling, the ferrite network...

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Abstract

The invention relates to a production method of steel for automobile connecting rods. The method comprises the following steps: smelting to form billets and rolling the billets into round steel; performing induction heating on the round steel; forging, cogging firstly, controlling the forging ratio to be 1:2 to 1:5 and the forging temperature to be 1120 to 1230 DEG C; die forging, controlling the die forging temperature to be 1050 to 1100 DEG C and the die forging time to be 2 to 4 seconds; side shearing, controlling the air cooling speed to be 5 to 10 DEG C / second and cooling to 500 to 600 DEG C; and performing natural cooling to room temperature in a closed environment. The method can accurately control the tissue proportion and distribution, so as to ensure that more than 70 percent of ferrite in steel is precipitated along the prior austenite crystal boundary and distributed in a continuous net way in steel, can effectively improve the cracking performance of the connecting rods, has a simple process line and high operability, and is easy to control and low in the production cost.

Description

technical field [0001] The invention relates to a production method of steel for automobiles, in particular to a production method of steel for automobile connecting rods. Background technique [0002] Engine connecting rod cracking processing technology is the latest technology in the international production of connecting rods. It was developed in the developed countries of the automobile industry in the 1990s and gradually applied to the field of mass production. Traditional connecting rod processing method. The connecting rod cracking material and its metallographic structure not only affect the service performance and machinability of connecting rod products, but also determine the crackability and section quality, which play a key role in the cracking process. Therefore, the connecting rod cracking material requires high strength, low plastic deformation, suitable brittleness and good machinability. [0003] At present, the materials used for cracking processing of c...

Claims

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Application Information

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IPC IPC(8): C22C38/60C21D8/00B21J5/02B21J1/06B62D7/20
Inventor 张贤忠杨志刚刘赞丰陈庆丰熊玉彰鲁光辉卢小生
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD