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TRIZ와 DEFORM<SUP>Ⓡ</SUP>을 활용한 트랜지션 노즐의 성형 공정 개선을 위한 가변 금형에 대한 연구
황희건(Hui-Geon Hwang),정원지(Won-Jee Chung),설상석(Sang-Suk Sul),김대영(Dae-Young Kim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.6
Transition Nozzles are used in industrial air-cooled heat exchangers and widely used in industrial sites as an important component in the heat energy transfer between a heat source and an actuating fluid. There is a worldwide demand for transition nozzles with various materials and shapes, depending on the use environment. This paper aims to improve the transition nozzle forging process suitable for the production of many varieties using Steps 1 to 6 of the TRIZ Methodology for Problem Solving. By utilizing the TRIZ Methodology, this study derives a method to design a variable mold, which is more efficient and can reduce costs compared with having to use several molds. To verify the suitability of the methods derived using the TRIZ technique, a forging analysis is performed on a transition nozzle using DEFORMⓇ, a commercial program for plasticity analysis, and the nozzle material is evaluated for damage as a result of deformation of the transition nozzle thickness. The derived methods can be applied to transition nozzle formation equipment to improve the efficiency of the formation process.
카스틸리아노 정리를 이용한 개선된 메카넘 휠의 롤러 축의 처짐에 대한 연구
황희건(Hui-Geon Hwang),정원지(Won-Jee Chung),김대영(Dae-Young Kim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.6
For simple and repetitive transport tasks in limited spaces such as in factories, it is more efficient to use mobile robots instead of human workers. For this reason, the reliance on mobile robots is increasing due to the increased implementation of smart factories. Currently, the structural design of the Mecanum wheel is required to ensure the stability of the moving robot since it is used for the transport of not only small products but also large products. In this paper, to improve the stability and durability of the Mecanum wheel, ways to improve the structure of the Mecanum wheel are presented. Then, using the Castigliano theorem, the structural stability is reviewed through the deflection on existing and improved structures.
고속 확장된 작업공간을 가진 병렬 로봇을 위한 경량 3-DOF 손목 메커니즘의 ANSYS 기반 응력해석
박상혁(Sang Hyeok Park),정원지(Won Jee Chung),황희건(Hui Geon Hwang),김홍록(Hong Rok Kim),최세웅(Se Woong Choi),지명준(Myeong Jun Jee),홍우철(Woo Cheol Hong) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.2
This study proposed a method of testing the stability when selecting gears to reduce the weight of a 3-DOF wrist mechanism for a pick-and-place 3-DOF parallel robot with an increased workspace by using an additional straight axis at its top. We performed SolidWorks<SUP>Ⓡ</SUP> modeling- and ANSYS<SUP>Ⓡ</SUP>-based structural analysis of a pinion gear, which is most vulnerable to the force from a 3-DOF wrist mechanism, to lighten the robot weight for performing various tasks. When the initial analysis results considerably differed from the theoretical values calculated in advance, we checked and identified the errors in the contact conditions or input values. Ultimately, it is believed that the methodology presented in this paper will help in mitigating errors during analysis and determine the accurate values for a lightweight 3-DOF wrist mechanism for a parallel robot with an expanded workspace.
Study of Brittle Crack Propagation Welding for EH40 Steel Plate in Shipbuilding Steel
Kyung-Shin Choi(최경신),Sang-Hoon Lee(이상훈),Won-Jee Chung(정원지),Hui-Geon Hwang(황희건),Seok-Han Hong(홍석한),Ji-Ung Hong(홍지웅) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.5
Recent economic trends are worsening and becoming longer, and Korean shipbuilding is focused on high value added and high technology, especially for LNG carriers and large container ships. Both ship types increased in size in the 2010s but have requirements such as high strength, toughness at low temperatures and continuous weldability for preventing brittle fractures at service temperatures. In particular, as container ships become larger, the International Classification Society (IACS) has established a provision (IACS UR S33) that mandates the use of BCA (Brittle Crack Arrest) certified vessels for large container vessels contracted after 2014 to ensure safety. Therefore, studies on BCA 47Y.P are currently being undertaken, but BCA 40Y.P has not been actively studied yet. We will test BCA 40Y.P to verify why it can be applied to a large container ship and measure fatigue cracking.