• Journal of the KSME
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• v.32 no.7
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• pp.620-631
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• 1992

자동차 중량의 경량화를 위한 몸체의 알루미늄화 추세는 최근 지구환경 보호측면에서도 필수적 이라 볼 수 있으며, 현재 사용하고 있는 강판과 비교하여 제조단가를 낮추고 강판의 스탬핑 성형 및 용접 . 조립라인에서 동등하게 고속 . 대량 생산이 가능한 생산기술을 구축하는 것이 알루미 늄에 의한 경량화를 꾀하기 위해 필요하다. 알루미늄판재의 스탬핑 성형성 확보를 위해서는 냉 연강판 수준의 기계적 성질의 확보, 금형 가공변수에 대한 최적 가공조건 확립과 알루미늄에 적합한 신 가공기술의 개발 등이 금후의 과제이다

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.10a
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• pp.178-182
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• 2008

Automotive manufacturers lay their eyes on the new manufacturing technologies because of the strengthened competition. Among them, a simultaneous forming is one of the innovative forming technologies to be able to reduce production time and cost. Several parts can be simultaneous manufactured by process, while the conventional stamping demands the same number of die sets with the number of parts. In this study, the automotive front side member was manufactured by the simultaneous forming. The position and the size of initial blank were determined by forming analysis and try-outs, and the blank movement during the forming was controlled by introducing the pilot pin.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.5769-5777
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• 2015

According to the forming or bending deformation in the press die, the thin plate occurs a work-hardening, the sheet hardening and cam unit's deformation causes incomplete forming during the cam molding process by the reacting spring forces. This study treated the input parameters of the stress and strain as given properties and also used Cam forming pressure considering the sheet hardening in the forming process of the aluminum sheet. The Hyperstudy are operated be linked with the Abaqus of the finite element analysis tool and the shape of Cam were carried out with non-linear shape optimization analysis. As a result removing the deformation of plate, the cam shape were optimized under conditions reduced deformation, having a minimum stress range and the minimum deformation. Therefore, a stress-strain curve and a normal distribution of stress-thickness can be obtained and optimization could be obtained for the shape of the stress and strain on the die plate hardened cam considering the thickness and reaction force of gas spring as iteration process.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.2
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• pp.921-926
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• 2015

Embossed aluminum sheets were been used in heat insulation purpose for automative exhaust parts because of increasing their surface areas and stiffness reinforcement. However, there are many restrictions because of high rate of wrinkle occurrence on press working. We have performed the tensile and bending tests for embossed sheets to clarity its mechanical properties and springback characteristics. Embossed aluminum sheets showed a different flow stress after plastic yielding due to flattening the embossed cone shape. Above all, yield stress of parallel embossed specimen decreases while its diagonal one increases and the decrease of young's modulus in the embossed sheets contributes to the increase of springback amount.

• Journal of the korean Society of Automotive Engineers
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• v.16 no.2
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• pp.12-21
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• 1994

본 연구에서는 차체용 알루미늄 합금 판재의 제조기술 개발을 위하여 선진국에서 사용하고 있는 알루미늄 합금 판재의 기계적 특성을 평가하여 이를 토대로 자동차 차체용 알루미늄 합금 설계 및 판재제조 기술을 개발하고자 한다. 자동차 차체용의 고 Mg계 알루미늄 합금의 양산 제조기술을 개발하기 위하여 Al-7% Mg 합금을 DC주조한 후 열간, 냉간압연 및 열처리 후의 특성을 평가하고 수입소재와 비교하여 실험하였다. 그 결과 자동차 차체용의 고 Mg계 알루미늄 합금 판재개발의 가능성을 확인하였으나 향후 광폭 판재를 제조하기 위해서는 대형 Slab 주조방안, 압연시의 가공성 향상등 판재 제조기술은 물론 성형성, 용접성 및 표면 처리성 등 응용기술에 대한 연구도 활발히 진행되어야 할 것으로 사료된다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.10a
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• pp.25-25
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• 2008

• Transactions of Materials Processing
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• v.11 no.1
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• pp.3-13
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• 2002

• Transactions of Materials Processing
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• v.12 no.3
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• pp.184-193
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• 2003

• Transactions of Materials Processing
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• v.17 no.4
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• pp.233-239
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• 2008

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1997.03a
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• pp.222-225
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• 1997

This paper describes experimental investigation on the forming limit for mash-seam welded sheets. The uniaxial tensile test was conducted to evaluate the mechanical properties of weld bead. Experimental forming limit diagrams were investigated for the different thicknesses and properties of welded sheets.