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Thermal treatment method for high-strength thermal formation torsion beam of automobile

A heat treatment method and thermoforming technology, applied in the field of heat treatment, can solve the problems of low fatigue strength and achieve the effects of improving product performance, eliminating stress and reducing deformation

Inactive Publication Date: 2018-09-07
永康市求精热处理厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a heat treatment method for high-strength thermoformed torsion beams for automobiles, which solves the problem of low fatigue strength caused by decarburization of the steel surface during the forming process of high-strength thermoformed torsion beams, and at the same time makes the material The comprehensive mechanical properties have been greatly improved, and the defects caused by the decarburization of the steel surface during the hot forming process of the high-strength hot-formed torsion beam have been completely eliminated

Method used

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  • Thermal treatment method for high-strength thermal formation torsion beam of automobile
  • Thermal treatment method for high-strength thermal formation torsion beam of automobile
  • Thermal treatment method for high-strength thermal formation torsion beam of automobile

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Effect test

Embodiment 1

[0042] The present invention is a heat treatment method for high-strength thermoformed torsion beams for automobiles. The material of the high-strength thermoformed torsion beams shown is BR1500HS, and the steps are as follows:

[0043] A: Preprocessing

[0044] Put the high-strength thermoformed torsion beam into the preheating furnace after stamping, use tooling to place the high-strength thermoformed torsion beam vertically, raise the temperature to 500°C at a speed of 10°C / min, and inject nitrogen at a rate of 1m³ / h , so that the furnace is a non-oxidizing atmosphere, keep warm for 100min;

[0045] B: carburizing treatment

[0046] Transfer the high-strength thermoformed torsion beam pretreated in step A to the carburizing furnace, use tooling to place the pipe vertically, and process it in three stages:

[0047] (1) Stage 1: heat up to 885°C at a rate of 10°C / min, and feed N at 4m³ / h 2 , drop methanol CH3OH at 3.5L / h, feed propane C3H8 gas at 0.6m³ / h, make the mass per...

Embodiment 2

[0068] The present invention is a heat treatment method for high-strength thermoformed torsion beams for automobiles. The material of the high-strength thermoformed torsion beams shown is BR1500HS, and the steps are as follows:

[0069] A: Preprocessing

[0070] Put the high-strength thermoformed torsion beam into the preheating furnace after stamping, use tooling to place the high-strength thermoformed torsion beam vertically, raise the temperature to 520°C at a speed of 10°C / min, and inject nitrogen at a rate of 1m³ / h , so that the furnace is a non-oxidizing atmosphere, keep warm for 120min;

[0071] B: carburizing treatment

[0072] Transfer the high-strength thermoformed torsion beam pretreated in step A to the carburizing furnace, and process it in three stages:

[0073] (1) Stage 1: heat up to 900°C at a rate of 10°C / min, and feed N at 4m³ / h 2 , drop methanol CH3OH at 3.5L / h, feed propane C3H8 gas at 0.6m³ / h, make the mass percentage of C in the non-oxidizing atmosphe...

Embodiment 3

[0094] The present invention is 1. a heat treatment method of a high-strength thermoformed torsion beam for automobiles, the material of the high-intensity thermoformed torsion beam shown is BR1500HS, and its steps are as follows:

[0095] A: Preprocessing

[0096] Put the high-strength thermoformed torsion beam into the preheating furnace after stamping, use tooling to place the high-strength thermoformed torsion beam vertically, raise the temperature to 540°C at a speed of 10°C / min, and inject nitrogen at a rate of 1m³ / h , so that the furnace is a non-oxidizing atmosphere, keep warm for 140min;

[0097] B: carburizing treatment

[0098] Transfer the high-strength thermoformed torsion beam pretreated in step A to the carburizing furnace, and process it in three stages:

[0099] (1) Stage 1: heat up to 895°C at a rate of 10°C / min, and feed N at 4m³ / h 2 , drop methanol CH3OH at 3.5L / h, feed propane C3H8 gas at 0.6m³ / h, make the mass percentage of C in the non-oxidizing atmos...

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Abstract

The invention discloses a thermal treatment method for a high-strength thermal formation torsion beam of an automobile. The high-strength thermal formation torsion beam is made of a material BR1500HS.The thermal treatment method comprises the following steps: performing pretreatment, namely putting the high-strength thermal formation torsion beam after stamping molding into a preheating furnace,placing vertically, heating to 500-540 DEG C at a speed of 100 DEG C / minute, and introducing nitrogen at a speed of 1m<3> / hour; performing carbonization treatment, namely treating for three sections;performing quenching treatment, namely soaking the high-strength thermal formation torsion beam into an oil tank to carry out quenching for 30 minutes at a vertical state, and adjusting the oil temperature to 75-85 DEG C; performing cleaning treatment, namely performing annealing treatment. By adopting the thermal treatment method for the high-strength thermal formation torsion beam of the automobile, the problem that the high-strength thermal formation torsion beam is low in fatigue strength because of steel surface decarburization in the formation process can be solved, meanwhile, the comprehensive mechanical properties of a material can be greatly improved, and defects caused by decarburization of a steel surface can be thoroughly eliminated in the thermal formation process of the high-strength thermal formation torsion beam.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment method based on a lightweight high-strength thermoformed torsion beam for automobiles. Background technique [0002] At present, automobile lightweight has become the main goal of the development of the automobile industry. Lightweight will improve fuel economy, increase tire life, reduce emissions, reduce braking distance, and reduce power steering. [0003] The torsion beam supported between the two rear wheels of a small passenger car (such as a car, SUV) will bear a large torque and bending force when it encounters a turn or an uneven road surface. To reduce the weight of the torsion beam (ie light weight) , you need to use high-strength hot-formed steel, such as BR1500HS. Although the mechanical properties of this high-strength hot-formed steel can meet the requirements of lightweight automobiles, the structure of lightweight torsion beams for automobiles is a sle...

Claims

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Application Information

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IPC IPC(8): C23C8/22C23C8/02C23C8/80C21D1/18C21D9/00C23F17/00
Inventor 王昌飞朱亚辉夏明道
Owner 永康市求精热处理厂
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