• Title/Summary/Keyword: 핫스탬핑

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Construction of Vehicle Door Impact Beam Using Hot Stamping Technology (핫스탬핑에 의한 자동차 도어 임팩트빔의 개발)

  • Lee, Hyun-Woo;Hwang, Jung-Bok;Kim, Sun-Ung;Kim, Won-Hyuck;Yoo, Seung-Jo;Lim, Hyun-Woo;Yum, Young-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.6
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    • pp.797-803
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    • 2010
  • A vehicle door impact beam made of a thin sheet of steel has been constructed using hot stamping technology with the aim of ensuring occupant safety in the event of a side collision. This technology has been used to increase the strength of the vehicle body parts and to reduce the weight of the door impact beam as well as the number of work processes. Mechanical tests were performed to determine the material properties of the hot-stamped specimen and the results of the tests were used as input data in stamping and structural simulation in order to obtain the optimal design of door impact beam. The strength of the hot-stamped door impact beam increased to a value that was 102% higher than that of conventional pipe-shaped door impact beam. A weight reduction of 34% was also achieved.

The Study on Weldability of Boron Steel and Hot-Stamped Steel by Using Laser Heat Source (III) - Comparison on Laser Weldability of Boron Steel and Hot-Stamped Steel - (레이저 열원을 이용한 보론강 및 핫스탬핑강의 용접특성에 관한 연구 (III) - 보론강 및 핫스탬핑강의 레이저 용접특성 비교 -)

  • Choi, So Young;Kim, Jong Do;Kim, Jong Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.1
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    • pp.89-94
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    • 2015
  • This study was conducted to compare the laser weldability of boron steel and hot-stamped steel. In general, boron steel is used in the hot-stamping process. Hot-stamping is a method for simultaneously forming and cooling boron steel in a press die after heating it to the austenitizing temperature. Hot-stamped steel has a strength of 1500 MPa or more. Thus, in this study, the laser weldability of boron steel and thet of hot-stamped steel were investigated and compared. A continuous wave disk laser was used to produce butt and lap joints. In the butt welding, the critical cooling speed at which full penetration was obtained in the hot-stamped steel was lower than that of boron steel. In the lap welding, the joint widths were similar regardless of the welding speed when full penetration was obtained.

The Study on Weldability of Boron Steel and Hot-Stamped Steel by Using Laser Heat Source (II) - Laser Weldability of Hot Stamping Steel with Ultra-High Strength - (레이저 열원을 이용한 보론강 및 핫스탬핑강의 용접특성에 관한 연구 (II) - 초고강도 핫스탬핑강의 레이저 용접특성 -)

  • Kim, Jong Do;Choi, So Young;Park, In Duck
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.12
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    • pp.1373-1377
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    • 2014
  • Hot-stamping is a method of obtaining ultrahigh-strength steel by simultaneously forming and cooling boron steel in a press die after it has been heated at $900^{\circ}C$ or above. After heat treatment, boron steel has a strength of 1500 MPa or more. This material ensures a high level of quality because it overcomes the spring-back phenomenon, which is a problem associated with high-strength steel materials, and the degree of dimensional precision is improved by 90 or more because of the good formability compared with existing types of steel. In this study, the welding characteristics were identified through the butt and lap welding of hot-stamped steel using a disk laser. Full penetration was obtained at a faster speed with butt welding compared to lap welding, and a white band was observed in every specimen.

A Study on Spot-Welding Characteristics and Material Analysis of Boron Steel for Hot-Stamping under Different Heat-Treatment Conditions (핫스탬핑용 보론 강판의 열처리 조건에 따른 재질분석 및 점용접 특성 연구)

  • Je, Hwan-Il;Son, Chang-Suk;Nam, Ki-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.4
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    • pp.383-391
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    • 2011
  • The hot-stamping technique is used to manufacture high-strength parts by press forming by heating at a temperature above the Austenite transformation temperature and then rapid cooling. Boron steel, which contains a very small amount of boron, is one of the materials used for hot stamping. The purpose of this study is to show the microstructures and to investigate the mechanical properties under different heat-treatment conditions. The heat treatment of water quenching was conducted at the various temperatures and different elapsed times. These can be practical data useful when boron steels are used for hot stamping. Furthermore, the microstructures and mechanical properties of the spot-welded specimen with coatings and counterpart materials (SPRC 340, SPRC 590) is investigated in order to determine the welding characteristics of boron steel at different welding condition.

A Study on the Properties of Laser-Welded Boron Steel for Hot Stamping According to the Heat-Treatment Conditions (핫스탬핑용 보론 강판의 레이저 용접부에 대한 열처리 조건에 따른 특성 연구)

  • Hwang, Seok-Hwan;Nam, Ki-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.3
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    • pp.319-324
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    • 2012
  • The hot-stamping technique is a forming method for manufacturing high-strength parts, in which the part is cooled rapidly after press forming above the austenite transformation temperature. Boron steel, which contains a very small amount of boron, is one of the materials used for hot stamping. The purpose of this study is to investigate the microstructure and mechanical properties according to the heat-treatment conditions. Die-quenching from various temperatures was conducted for different elapsed heat-treatment times. Laser-welded boron steel after quenching has a tensile strength of 1454 MPa and an elongation of 6 %. It has 94 % of the tensile strength of the base metal (1522 MPa). These properties can provide practical information for the use of boron steels for hot stamping.

The Study on Weldability of Boron Steel and Hot-Stamped Steel by Using Laser Heat Source (I) - Laser Weldability of Al-Si Coated Boron Steel Used for Hot Stamping Process - (레이저 열원을 이용한 보론강 및 핫스탬핑강의 용접특성에 관한 연구 (I) - 핫스탬핑 공정에 사용되는 Al-Si 코팅된 보론강의 레이저 용접특성 -)

  • Kim, Jong Do;Choi, So Young;Lee, Su Jin;Suh, Jeong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.12
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    • pp.1367-1372
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    • 2014
  • As the awareness of the environmental crisis has recently increased around the world, numerous studies in the transport industry have been conducted to solve this problem through lightweight car bodies. The hot-stamping process has been presented as solution to achieve a light weight. Hot-stamping is a method that is used to obtain ultra-high strength steel (1,500 MPa or greater) by simultaneously forming and cooling boron steel in a press die after heating it to a temperature of $900^{\circ}C$ or above. This study involved a, fundamental examination of laser parameters to investigate the laser weldability of boron steel. As a result, the following optimum parameters for the shielding gas were found: Q = 20 l/min, ${\alpha}=40^{\circ}$, d = 20mm, and l = 0 mm. The hardness of butt weldment increasesed sharply as a result of martensite formation at the fusion zone.

Development of Vehicle Door Impact Beam by Hot Stamping (핫스탬핑에 의한 자동차 도어 임팩트빔의 개발)

  • Yum, Young-Jin;Kim, Jong-Gook;Lee, Hyun-Woo;Hwang, Jung-Bok;Kim, Sun-Ung;Kim, Won-Hyuck;Yoo, Seung-Jo
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.7-12
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    • 2008
  • A hot stamping technology of vehicle door impact beam made of thin sheet steel has been developed, with the aim of ensuring occupant safety in a side collision. This technology has been implemented to increase the strength of vehicle body parts and to reduce not only the weight of door impact beam but also the number of work processes. Mechanical tests were performed to obtain material properties of hot-stamped specimen and those were used as input data in stamping and structural simulation for optimal design of door impact beam. Strength of hot-stamped door impact beam increased to the value 102% higher than that of conventional pipe-shaped door impact beam and structural simulation showed that hot-stamped door impact beam achieved 28% weight reduction.

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