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Overall quenching process of car closed torsion beam

An overall quenching and closed technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of affecting fatigue performance, uneven hardness, high cost, etc., to solve mass production problems and improve organization Uniformity and the effect of reducing production cost

Active Publication Date: 2017-12-01
天人汽车底盘(芜湖)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: the high strength requirements of the torsion beam cannot be realized, and the strength can only be limited below 800MPa
Disadvantages: Unable to perform overall quenching, there will be some unquenched areas at both ends of the beam
Disadvantages: 1) High cost; 2) Serious partial thinning of wall thickness; 3) Difficult to control feeding amount; 4) Difficult to form ultra-high-strength steel; 5) Uneven hardness, which affects fatigue performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An overall quenching process for closed torsion beams of cars, which consists of the following steps:

[0020] 1) Blanking: Cut the raw material out of the original tube with a tube cutter;

[0021] 2) Stamping: stamping the round tube into shape;

[0022] 3) Heat treatment: use the multi-purpose furnace production line to evenly place the workpieces on the tooling, 28 pieces per furnace, ① first stress relief and preheating treatment, the process temperature is 540 ° C, and keep warm for 50 minutes; ② Then increase the temperature to 740 ° C, keep warm for 25 minutes , carbon potential 0.5; then raise the temperature to 825°C, hold for 55 minutes, and the carbon potential is 0.8; ③ Use Houghton graded quenching oil for quenching, and the quenching time is 15 minutes; ④ The workpiece comes out of the multi-purpose furnace production line, and then enters the tempering furnace for back Fire, tempering temperature 445 ℃, tempering holding time 110 minutes;

[0023] 4) S...

Embodiment 2

[0028] An overall quenching process for closed torsion beams of cars, which consists of the following steps:

[0029] 1) Blanking: Cut the raw material out of the original tube with a tube cutter;

[0030] 2) Stamping: stamping the round tube into shape;

[0031] 3) Heat treatment: use the multi-purpose furnace production line to evenly place the workpieces on the tooling, 26 pieces per furnace, ① first stress relief and preheating treatment, process temperature 550 ° C, keep warm for 60 minutes; ② then heat up to 750 ° C, keep warm for 30 minutes , carbon potential 0.7; then raise the temperature to 830°C, hold for 60 minutes, and the carbon potential is 0.9; ③ Use Houghton graded quenching oil for quenching, and the quenching time is 18 minutes; ④ The workpiece comes out of the multi-purpose furnace production line, and then enters the tempering furnace for back Fire, tempering temperature 450 ℃, tempering holding time 120 minutes;

[0032] 4) Straightening: Straightening ...

Embodiment 3

[0037] An overall quenching process for closed torsion beams of cars, which consists of the following steps:

[0038] 1) Blanking: Cut the raw material out of the original tube with a tube cutter;

[0039] 2) Stamping: stamping the round tube into shape;

[0040] 3) Heat treatment: Use the multi-purpose furnace production line to evenly place the workpieces on the tooling, 30 pieces per furnace, ① first stress relief and preheating treatment, the process temperature is 560 ° C, and hold for 70 minutes; ② Then heat up to 760 ° C and hold for 35 minutes , carbon potential 1.0; then raise the temperature to 835°C, hold for 60 minutes, and the carbon potential is 1.0; ③ Use Houghton graded quenching oil for quenching, and the quenching time is 20 minutes; ④ The workpiece comes out of the multi-purpose furnace production line, and then enters the tempering furnace for back Fire, tempering temperature 455 ℃, tempering holding time 130 minutes;

[0041] 4) Straightening: Straighten...

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Abstract

The invention discloses an overall quenching process of a car closed torsion beam. The overall quenching process comprises the steps: 1) blanking; 2) stamping; 3) heat treatment; 4) straightening; 5) shot blasting; 6) punching; and 7) laser cutting. According to the overall quenching process disclosed by the invention, from the point of validity and innovation of equipment, a high frequency furnace is replaced with a multi-purpose furnace for heat treatment production of the closed torsion beam, and resources are utilized effectively; the production cost of the closed torsion beam is reduced, and the effect of batch production is achieved; the overall quenching is achieved, and the structure uniformity is improved effectively; the problems of uneven metallographic structures and grain sizes caused by power fluctuation and local output difference of the high frequency furnace are solved. The test shows that the mechanical strength of the car closed torsion beam produced with the overall quenching process is high, the tensile strength reaches 1330-1360 MPa, Rp0.2 reaches 1220-1250 MPa, and the elongation is 12%; the fatigue property is excellent after heat treatment, and the requirements of main engine plants are met.

Description

technical field [0001] The invention relates to an overall quenching process for a closed torsion beam of a car. Background technique [0002] At present, the known heat treatment processes for closed torsion beams of cars include high-strength steel stress relief annealing, high-frequency quenching and thermoforming, among which: [0003] 1. Annealing process: process, the workpiece is heated to 500-600°C with the furnace, and the holding time is 2-3 hours. Slowly cool in the furnace to 400°C and then air-cool for laser cutting. Disadvantages: the high-strength requirements of the torsion beam cannot be achieved, and the strength can only be limited below 800MPa. [0004] 2. High-frequency quenching: In the process, the workpiece is put into the vertical high-frequency induction tooling, and the high-frequency induction coil is used to quench the torsion beam. The heating temperature is about 850°C, and the water-based quenching medium is cooled by spraying the tooling. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C23C8/22
CPCC21D1/18C23C8/22
Inventor 陈永胜张旭龚量亮李波
Owner 天人汽车底盘(芜湖)股份有限公司
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