• 제목/요약/키워드: Hot stamping

검색결과 85건 처리시간 0.027초

레이저 열원을 이용한 보론강 및 핫스탬핑강의 용접특성에 관한 연구 (I) - 핫스탬핑 공정에 사용되는 Al-Si 코팅된 보론강의 레이저 용접특성 - (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 -)

  • 김종도;최소영;이수진;서정
    • 대한기계학회논문집A
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    • 제38권12호
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    • pp.1367-1372
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    • 2014

  • 전세계적으로 환경문제에 대한 위기의식이 고조됨에 따라 운송산업 분야에서는 차체경량화를 통해 이와 같은 문제를 해결하고자 하였다. 차체경량화의 방법으로써 보론강을 $900^{\circ}C$이상의 온도에서 가열한 후, 성형과 동시에 냉각하여 1500 MPa 이상의 강도를 얻을 수 있는 핫스탬핑 공정이 제시되고 있다. 하지만 핫스탬핑 공정에 일반적으로 사용되고 있는 보론강의 레이저 용접성에 대한 연구결과는 많지 않다. 따라서 본 연구에서는 보론강의 레이저 용접특성을 조사하기 위해 레이저 매개변수에 대하여 기초적 연구를 실시하였다. 실험결과, 실드가스에 대한 매개변수의 최적의 조건은 $Q=20{\ell}/min$, ${\alpha}=40^{\circ}$, d = 20 mm, l = 0 mm이며, 맞대기 용접부의 경도는 용접부에서 마르텐사이트 형성으로 인해 급격하게 상승하였다.

  • https://doi.org/10.3795/KSME-A.2014.38.12.1367 인용 PDF KSCI

보론강 용접 맞춤 판재의 고온 에릭슨 커핑 평가 (Formability Evaluation of Tailor Welded Blanks of Boron Steel Sheets by Erichsen Cupping Test at Elevated Temperature)

  • 김영일;김지훈;김용;이문용;문영훈;김대용
    • 소성∙가공
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    • 제20권8호
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    • pp.568-574
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    • 2011

  • The combination of tailor welded blank (TWB) and hot stamping often offers improved crash-worthiness and reduced mass of stamped parts in the automobile body. To investigate the formability of laser TWB and the reliability of weld line, the present study used 22MnB5 boron steel sheet of the same thickness and used the Erichsen cupping test at elevated temperatures. The effects of laser direction, die temperature, weld line positions and forming speed on formability(the limiting dome height) were studied and the results were compared with the formability of the base material.

  • https://doi.org/10.5228/KSTP.2011.20.8.568 인용 PDF KSCI

Characterization of Mechanical Properties of Boron Steel Sheet in Hot Bending Process with Various Parameters

  • 이양;강충길
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2009년도 추계학술대회 논문집
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    • pp.375-378
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    • 2009

  • Hot press forming is a new forming process which also names as hot stamping. It can greatly enhance the formability of forming parts. This paper researches the formability of boron steel sheet in hot bending process which is a kind of hot press forming. In the text, the influence of hot press forming processing parameters, such as the heating temperature, blank holding force, punch speed and punch and die radius, on the mechanics properties and microstructure of the hot bending parts was analyzed by tension test and the metallographic observation on the parts with various processing parameters. The relationship between blank holding force and punch load was also presented.

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자동차 열간 프레스 가공 부품의 내식성에 관한 연구 (A Study on the Corrosion Resistance of Hot Stamped Automotive Parts)

  • 유지홍;남승만
    • 한국자동차공학회논문집
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    • 제18권5호
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    • pp.25-30
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    • 2010

  • The authors have studied on the corrosion resistance of the hot stamped steel sheets for the application to automotive parts. Recently automotive companies have focused on the hot stamped parts to meet the light weighting needs and the safe reason. Because of the cost reduction of the hot stamped parts, automotive companies increase the usage of the coated steel sheets, especially Al-Si coated steel sheets. The coated layer of Al-Si coated steel sheets contains up to 50% of Fe, which was diffused from the steel sheet, after hot stamping. The hot stamped steel sheet was not phosphated due to the oxidation layer of the coating, however, the result of the water resistance test is similar to that of the conventional GA steel sheets. The pitting depth and the weight reduction of the coated layer of hot stamped steel sheets are less than those of GA steel.

  • PDF KSCI