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Thermoforming method to improve the strength and plasticity of automobile parts

A technology of auto parts and thermoforming, which is applied in the field of parts forming, can solve the problems of high strength and low plasticity, and achieve the effects of eliminating internal stress, increasing elongation, and improving plasticity

Active Publication Date: 2015-08-12
武汉钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the current problem of high strength and low plasticity of thermoformed auto parts, and provides a thermoforming method for improving the strength and plasticity of auto parts. The method includes the following steps:

Method used

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  • Thermoforming method to improve the strength and plasticity of automobile parts
  • Thermoforming method to improve the strength and plasticity of automobile parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Roll out a hot-formed part blank with the following composition, C: 0.2wt%, Mn: 1.4wt%, Si: 0.2wt%, Cr: 0.1wt%, Ni: 0.01wt%, Nb: 0.001wt% , Mo: 0.004wt%, B: 0.001wt%, Fe balance, the original structure of the hot-formed part blank is as follows figure 1 shown;

[0023] 2) Put the thermoformed part blank into a high-temperature box-type heating furnace for heating. The furnace temperature is set at 850°C and heated for 3 minutes;

[0024] 3) When the heating and heat preservation is finished, the thermoforming part blank is transferred to the thermoforming mold with an independent cooling system for thermoforming. The transfer time is 5 seconds. The working parameters of the thermoforming mold cooling system are set in advance, and the thermoforming The mold surface temperature is controlled at 150°C;

[0025] 4) When the thermoforming is finished and the temperature is 120°C, open the thermoforming mold, and transfer the thermoformed parts to a low-temperature box-...

Embodiment 2

[0028] 1) Roll out a hot-formed part blank with the following composition, C: 0.23wt%, Mn: 1.42wt%, Si: 0.24wt%, Cr: 0.16wt%, Ni: 0.013wt%, Nb: 0.0012wt% , Mo: 0.0043wt%, B: 0.002wt%, Fe balance, the original structure of the hot forming part blank is as follows figure 1 shown;

[0029] 2) Put the thermoformed part blank into a high-temperature box-type heating furnace for heating. The furnace temperature is set at 850°C and heated for 3 minutes;

[0030] 3) When the heating and heat preservation is completed, the thermoforming part blank is transferred to the thermoforming mold with an independent cooling system for thermoforming. The transfer time is 5 seconds, and the working parameters of the thermoforming mold cooling system are set in advance. The mold surface temperature is controlled at 160°C;

[0031] 4) When the thermoforming is finished and the temperature is 120°C, open the thermoforming mold, and transfer the thermoformed parts to a low-temperature box-type heat...

Embodiment 3

[0034] 1) Roll out a hot forming part blank with the following composition, C: 0.25wt%, Mn: 1.45wt%, Si: 0.25wt%, Cr: 0.15wt%, Ni: 0.015wt%, Nb: 0.0014wt% , Mo: 0.0045wt%, B: 0.004wt%, Fe balance, the original structure of the hot-formed part blank is as follows figure 1 shown;

[0035] 2) Put the thermoformed part blank into a high-temperature box-type heating furnace for heating. The furnace temperature is set at 900°C and heated for 3 minutes;

[0036] 3) When the heating and heat preservation is completed, the thermoforming part blank is transferred to the thermoforming mold with an independent cooling system for thermoforming. The transfer time is 5 seconds, and the working parameters of the thermoforming mold cooling system are set in advance. The mold surface temperature is controlled at 170°C;

[0037] 4) When the thermoforming is finished and the temperature is 120°C, open the thermoforming mold, and transfer the thermoformed parts to a low-temperature box-type heat...

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Abstract

The invention discloses a thermoforming method for improving the strength and the plasticity of a vehicle part. The method comprises the following steps of 1) rolling to form a thermoforming part blank with required components; 2) heating the thermoforming part blank for the first time; 3) conveying the thermoforming part blank to a thermoforming die with an independent cooling system to be thermally formed, wherein the surface temperature of the thermoforming die is controlled to be between 150 and 200 DEG C; and 4) when thermoforming is finished, the temperature is reduced to 115 to 125 DEG C, opening the thermoforming die, heating the thermoforming part for the second time, tempering the thermoforming part at low temperature of 200 to 500 DEG C, and after carrying out heat treatment for 30 to 60 seconds, taking the thermoforming part out of a heating furnace and naturally cooling the thermoforming part to obtain the thermoforming vehicle part with high strength and high plasticity. The microstructure of the vehicle part which can be obtained by using the method is a uniform and tiny plate martensitic structure; the vehicle part has high strength and high plasticity; and the specific elongation of the vehicle part is also greatly improved.

Description

technical field [0001] The invention relates to a forming method of parts, in particular to a thermoforming method for improving the strength and plasticity of automobile parts. Background technique [0002] The continuous growth of automobile production, automobile ownership and energy shortage have made the three major problems of automobile energy consumption, safety and exhaust emissions increasingly prominent. The use of high-strength automotive steel can reduce the weight of the car without affecting the safety of the car. Moreover, every 1% reduction in the weight of the car can save 0.6% to 1% of fuel consumption, thereby reducing the exhaust emissions of the car. [0003] With the rapid development of automobile lightweight industry, modern automobile body design is developing towards fuel economy, safety, environmental friendliness, comfort, beautiful appearance and low cost. For the outer body panels, high press forming performance, high strength, low springback,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/02B21D37/16C22C38/54C21D1/18
Inventor 龙安李箭葛锐张宜生刘吉斌陈寅胡宽辉刘凯王超
Owner 武汉钢铁有限公司
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