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박동환,윤재정,홍진태,권혁홍,Park, Dong-Hwan,Yun, Jae-Jung,Hong, Jin-Tae,Kwon, Hyuk-Hong The Korean Society of Manufacturing Process Engine 2017 한국기계가공학회지 Vol.16 No.4
In the sand casting process, the flow of liquid metal affects the quality of casting products and their die life. To determine the optimal bush part design process, this study performed various analyses using commercial finite element analysis S/W. The simulation focused on the molten metal behaviors during the mold filling and solidification stages of sand casting. This study aims to develop methods to reduce the cost and increase the tool life of the continuous hot zinc plating roll.
박동환(Dong-Hwan Park),윤재정(Jae-Jung Yun) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
신개념 용접조립 기술은 2단 셔틀(2 step shuttle)로 구성된 자동차 차체부품 용접기술에 관한 것으로 자동차 차체 부품을 이송하여 용접할 수 있도록 하는 셔틀을 상하 2단으로 분리 구성하여 각 셔틀에 의해 이송되는 차체 부품이 용접 로봇에 의해 용접 가공될 수 있도록 구성함으로써 용접 로봇이 불필요하게 대기하지 않으면서 계속적으로 용접작업이 가능하여 용접 효율이 향상되고, 셔틀의 상하 구성으로 인해 작업 공간 활용도가 매우 높은 기술이다.
Dong-Hwan Park(박동환),Jae-Jung Yun(윤재정),Jin-Tae Hong(홍진태),Hyuk-Hong Kwon(권혁홍) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
In the sand casting process, the flow of liquid metal affects the quality of casting products and their die life. To determine the optimal bush part design process, this study performed various analyses using commercial finite element analysis S/W. The simulation focused on the molten metal behaviors during the mold filling and solidification stages of sand casting. This study aims to develop methods to reduce the cost and increase the tool life of the continuous hot zinc plating roll.
초고장력 강판을 적용한 Cowl Cross Member의 레이저 용접 적용에 관한 연구
박동환(Dong Hwan Park),윤재정(Jae Jung Yun),김근영(Kun Young Kim) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.5
A cowl cross is a part of the car’s instrument panel used to maintain the rigidity of the vehicle body side. The application of laser welding has the benefits of speed and thermal deformation compared to arc welding. An ultra?high strength steel sheet is used to reduce the weight of the vehicle body parts. Generally, formability of such a steel sheet is poor because its elongation is very low. For this reason, a method for cold forming of an ultra-high strength steel sheet is required. This paper describes how to improve the formability and weldability of the ultrahigh strength steel sheet. Mechanical tests of this material were also performed to evaluate the welding properties of CO₂ (GMAW) and those of laser welding.
초고강도 소재 성형시 형상 동결을 이용한 Seat Track 부품 개발
박동환(Dong Hwan Park),윤재정(Jae Jung Yun),문현덕(Hyun Duk Moon),이태길(Tae Gil Lee) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.1
A seat track product is a car seat part that provides a base for vehicle seats. An ultra–high strength steel sheet is used to reduce the weight of vehicle body parts. However, the formability of an ultra–high strength steel sheet is poor because of its very low elongation and very high elastic deformation. For this reason, a new forming technology of an ultra-high strength steel sheet is required. The influence of spring-back of seat track parts on the shape freeze in forming processes was investigated to be solved by adjusting the appropriate tool design such as minus clearance between punch and die, and punch angle. This paper describes how to apply the spring-back prevention technique for improving shape freeze by using the ultra-high strength steel sheet with 980MPa to develop lightweight seat tract parts.