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Integral thermal-treatment processing method for closed type torsion beam of car

An overall heat treatment and processing method technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of unsatisfactory tensile strength and elongation rate of finished products, reduced mechanical properties of material matrix, and fatigue cracks of torsion beams, etc., to achieve durability excellent performance, reduce heat treatment energy consumption, and suppress fatigue cracks

Active Publication Date: 2017-12-12
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

The stress of the existing closed torsion beam is reduced after stamping, and the mechanical properties of the material matrix are also reduced, resulting in unsatisfactory tensile strength and elongation of the finished product. The torsion beam is prone to fatigue cracks during the operation of the car, and there are certain safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for overall heat treatment of a closed torsion beam of a car, comprising the following steps:

[0015] 1) Cutting: Cut the high-strength steel pipe out of the original pipe with a pipe cutter;

[0016] 2) Stamping: stamping the original tube into shape;

[0017] 3) Heat treatment: place the workpiece on the tooling and put it into the annealing furnace, 150 pieces per furnace. ①The workpiece is heated to 570°C with the furnace and kept for 140 minutes to remove the processing stress and homogenize the structure; ②The workpiece is in the annealing furnace Slowly cool to 440°C at a rate of 30°C / hour, open the furnace door 1 / 3, air convection cooling, when the temperature of the workpiece reaches 305°C, leave the furnace, and air cool to room temperature;

[0018] 4) Laser cutting: Cut the openings at both ends of the workpiece into the desired overlapping shape;

[0019] 5) Welding: Put the cut workpiece on the robot welding fixture, and perform automatic weldi...

Embodiment 2

[0021] A method for overall heat treatment of a closed torsion beam of a car, comprising the following steps:

[0022] 1) Cutting: Cut the high-strength steel pipe out of the original pipe with a pipe cutter;

[0023] 2) Stamping: stamping the original tube into shape;

[0024] 3) Heat treatment: place the workpiece on the tooling and put it into the annealing furnace, 150 pieces per furnace. ①The workpiece is heated to 575°C with the furnace and kept for 150 minutes to remove the processing stress and homogenize the structure; ②The workpiece is in the annealing furnace Slowly cool to 450°C at a rate of 40°C / hour, open the furnace door for 1 / 3, air convection cooling, when the temperature of the workpiece reaches 300°C, leave the furnace, and air cool to room temperature;

[0025] 4) Laser cutting: Cut the openings at both ends of the workpiece into the desired overlapping shape;

[0026] 5) Welding: Put the cut workpiece on the robot welding fixture, and perform automatic w...

Embodiment 3

[0028] A method for overall heat treatment of a closed torsion beam of a car, comprising the following steps:

[0029] 1) Cutting: Cut the high-strength steel pipe out of the original pipe with a pipe cutter;

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

[0031] 3) Heat treatment: place the workpiece on the tooling and put it into the annealing furnace, 150 pieces per furnace. ①The workpiece is heated to 580°C with the furnace and kept for 160 minutes to remove the processing stress and homogenize the structure; ②The workpiece is in the annealing furnace Slowly cool to 460°C at a rate of 50°C / hour, open the furnace door 1 / 3, air convection cooling, when the temperature of the workpiece reaches 295°C, leave the furnace, and air cool to room temperature;

[0032] 4) Laser cutting: Cut the openings at both ends of the workpiece into the desired overlapping shape;

[0033] 5) Welding: Put the cut workpiece on the robot welding fixture, and perform automatic weldi...

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Abstract

The invention discloses an integral thermal-treatment processing method for a closed type torsion beam of a car. The integral thermal-treatment processing method comprises the following steps of 1) blanking; 2) stamping; 3) thermal treatment; 4) laser welding; and 5) welding. The integral thermal-treatment processing method adopts an annealing slow-cooling process and removes processing stress, so that the texture of the torsion beam is uniform. The closed type torsion beam, produced by the integral thermal-treatment processing method, of the car has tensile strength being 700-750 MPa, Rp 0.2 reaching 600-650 MPa, elongation greater than or equal to 18%, excellent ductility and toughness, and gives consideration to strength of the torsion beam body. The fatigue life according to a bench test is greater than 0.2 million of times, durability is excellent, generation of fatigue cracks in an operating process can be inhibited to the greatest extent, production cost is effectively reduced, and production efficiency is improved. The integral thermal-treatment processing method solves the technical problem that the high-strength steel closed type torsion beam in the car industry cannot reach the standards, reduces the possibility that deformation appears in a torsion beam thermal treatment process, and reduces thermal treatment energy consumption.

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, torsion beams are often used in lower-priced A-class car rear axles. The traditional torsion beam structure is formed by stamping steel plates, and the thickness of the plates is generally 4-7mm. In order to improve the rigidity requirements of the model, it is generally necessary to add a stabilizer bar inside the torsion beam, resulting in a higher weight of the torsion beam assembly. Under the trend of environmental protection and weight reduction, domestic automobile rear axles have gradually transitioned to closed torsion beams. The stress of the existing closed torsion beam is reduced after stamping, and the mechanical properties of the material matrix are also reduced, resulting in unsatisfactory tensile strength and elongation of the finished product. The torsion beam is prone to fatigue cracks during the operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/26
CPCC21D1/26C21D9/0068
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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