Ultrahigh-strength steel laser tailor welded blank and forming process thereof

A technology of ultra-high-strength steel and laser tailor welding, which is applied in the field of material processing to achieve the effects of improving assembly accuracy, meeting safety and energy saving and emission reduction, and solving difficulties in cold forming

Inactive Publication Date: 2011-08-24
SHANDONG JIANZHU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In recent years, although a lot of research work has been done on laser tailor welded blanks and hot stamping technology at home and abroad, the research objects are limited to the field of existing technologies and only foc

Method used

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  • Ultrahigh-strength steel laser tailor welded blank and forming process thereof
  • Ultrahigh-strength steel laser tailor welded blank and forming process thereof
  • Ultrahigh-strength steel laser tailor welded blank and forming process thereof

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Embodiment 1

[0026] Ultra-high-strength steel laser tailor-welded blank forming part B-pillar reinforcement ( figure 1 As shown), Baosteel’s ultra-high-strength boron steel B1500HS with a thickness of 1.5mm is used for the front part with high safety requirements; while the upper and lower ends of the reinforcement that require both formability and energy absorption are used with a thickness of 1.5 mm. 1.0mm Baosteel high-strength steel HC340 ( figure 2 shown), laser welding followed by hot stamping. When a crash occurs, the role of the HC340 steel is to absorb the crash energy, while the role of the boron steel B1500HS is to move the load away from the cockpit, thereby avoiding catastrophic plastic deformation of the cockpit.

[0027] Forming process steps:

[0028] 1) blanking;

[0029] 2) Tailored laser welding;

[0030] 3) Heating to 920-940°C in a walking furnace for at least 5 minutes to fully austenitize;

[0031] 4) Quick transfer to the press;

[0032] 5) Rapid mold clampin...

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Abstract

The invention relates to an ultrahigh-strength steel laser tailor welded blank and a forming process thereof. The forming process provided by the invention comprises the following steps: carrying out the laser tailor welding on ultrahigh-strength steel and high-strength steel according to the needed shape; then, delivering the obtained welded blank to a furnace filled with a protective gas and heating to 920-940 DEG C to be continued for at least 5 minutes; fully austenitizing; transferring the austenitized welded blank to a press machine to be rapidly molded and formed; cooling to 100-150 DEG C through pressurization quenching; and cooling along room temperature to obtain the needed parts. The hot stamping process of the laser tailor welded blank provided by the invention has the double advantages of the forming and hot stamping forming of the laser tailor welded blank and simultaneously solves the problems that the ultrahigh-strength steel is difficultly applied to the production ofautomobile structural components/framework components in a laser tailor welded blank mode.

Description

technical field [0001] The invention relates to the design and forming process of ultra-high-strength steel for automobiles, and belongs to the technical field of material processing. Background technique [0002] With the increasingly prominent energy and environmental issues, and the improvement of people's requirements for the safety, reliability, and comfort of cars, major automakers are trying to improve the structural design of cars and find new alternative materials. The weight of the car; continuous improvement and adoption of new parts manufacturing processes to improve product quality. [0003] Tailor Welded Blanks (TWBs) is to weld several steel plates of different materials, thicknesses and coatings into one piece to meet the different requirements of parts for material properties. Laser welding is ideally suited for the production of tailor-welded blanks due to several significant advantages. The use of laser tailor welded blanks not only reduces the manufactu...

Claims

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Application Information

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IPC IPC(8): F16S1/10B23P15/00B23K26/20B23K26/24
CPCB21D35/006
Inventor 唐炳涛王红娟原政军程钢李云江
Owner SHANDONG JIANZHU UNIV
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