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4-스포크 스켈리튼 스틸 휠 디스크의 드로우 금형 개발
인정제 ( Jeong-je Yin ),정태은 ( Tae-eun Chung ) 한국고등직업교육학회 2006 한국고등직업교육학회논문집 Vol.7 No.2
It is difficult to draw skeleton steel wheel disk which is made of high strength steel because of various bends. But the skeleton steel wheel has many merits such as light weight, fuel economy and product price. So 4-spoke typed skeleton steel wheel disk was developed considering effective structure, profit forming process and other factors. Finite element simulation and draw test were done to examine the draw processes. The desirable model for drawing process was proposed from the detailed simulation. This result will be used for developing 5-spoke typed skeleton steel wheel disk.
측면 충돌 성능을 고려한 테일러드 블랭크 사이드 패널 설계
인정제 ( Jeong-je Yin ) 한국고등직업교육학회 2002 한국고등직업교육학회논문집 Vol.3 No.2
Tailored blanks are increasingly used in car body design. Among these, the tailored blank side panels have merits in both weight reduction and the improvement of structural performances. This paper presents the optimal design of tailored blank side panels considering side crash performances. 12 different designs of tailored blank side panels for a mid-class vehicle were proposed to examine the crash performances. Side crash analyses using PAMCRASH were performed for the vehicles adopting tailored blanks and reference vehicle. From the analysis results, the optimum parting patterns and materials combinations of tailored blank side panels could be found.
인정제(Yin, Jeong-Je) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11
본 연구에서는 대형 차체 판넬과 같은 유연성이 큰 판넬의 3차원 형상을 스캐닝 하기 위한 고정구를 개발하 였다. 유연 판넬에 대한 N-2-1 설계원리에 따라 자중의 영향이 최소화되는 지지점들을 유한요소 해석을 통하여 선정 함으로써 hood outer 판넬의 고정구를 설계하고, Alufix 시스템을 이용하여 스캐닝 고정구를 제작하였다. 제작된 고정 구를 이용하여 레이저 스캐닝을 수행하여 성공적으로 스프링 백을 측정함으로써, 본 연구에서 제안된 고정구 제작 방 안의 유용성을 확인하였다. In this study, a scanning fixture for flexible parts such as large automotive panels is developed. For the minimization of the weight deflection of a hood outer panel, the N-2-1 fixture principle for flexible parts is adopted in the fixture design. The designed fixture for a hood outer panel is fabricated using the Alufix system. The springback of the entire hood outer panel can be measured successfully by the laser scanning with the developed fixture, which verifies the usefulness of the proposed design method for the flexible panels.
콤플렉스법을 이용한 U-채널 성형의 스프링백 강건 설계
인정제(Jeong-Je Yin),김경모(Kyung-Mo Kim),박종천(Jong-Cheon Park) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.1
Variations of springback in stamped parts are induced by the uncontrollable noises including the variation of incoming material properties, lubrication and other forming process parameters. Reduction of springback variation is very important during springback compensation processes on stamping dies and assembly processes. To reduce the variation of springback, a robust optimization methodology which uses complex method combined with orthogonal array is proposed. The proposed method is applied to the robust design of U-channel die for the reduction of side wall curl. It is shown that the drawbead and die radius of U-channel draw die can be effectively optimized by the proposed method.
인정제 ( Jeong-je Yin ) 한국고등직업교육학회 2006 한국고등직업교육학회논문집 Vol.7 No.1
Surface deflection is defined as a wrinkle with height lower than 0.2mm, and generally occurs where shape change is large. Surface deflection around the door handle is generally as small as tens of microns in height, but it results in shadows due to light deflection, which deteriorates car quality in terms of appearance. In this study, simulation of surface deflection has been conducted using PAM-STAMP, and applied to a front door of a pre-production model. In order to obtain higher accuracy of the simulation, meshes have been carefully aligned along the feature line of the door handle. Importance of the mesh alignment has been shown clearly with a U-bending test. The simulation result has shown clear pattern of surface deflection, which was in good accordance with the pattern experimentally obtained. Simulations of three different forming processes have been conducted using a simplified model to find how to reduce surface deflection.
Optimization of Thermal Deformation in Probe Card
장용훈(Chang, Yong-Hoon),인정제(Yin, Jeong-Je),YongS.Suh 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11
프로브 카드는 웨이퍼의 칩 검사에 사용된다. 또한 반도체의 고집적화에 따른 미세피치 대응으로 높은 위치 정도가 요구된다. 그러나 실제 장비에서는 하부 척에서 높은 열이 프로브 카드로 전달되어, 프로브 카드의 열변형을 초래하게 된다. 프로브 카드의 수직방향 열변형은 핀의 접촉관련 문제를 야기할 것이고, 수평방향의 열변형은 x-y 방 향으로의 위치 오차를 만들 것이다. 따라서 프로브 카드는 허용 범위내의 열변형이 이루어지도록 재질과 구조를 갖게 설계되어야 한다. 본 연구에서는 유한요소 해석프로그램인 ANSYSTM를 이용하여 프로브 카드의 실제 부하 조건들을 적용한 열전달 해석을 수행하였다. 정상상태 온도 구배에 대해 열변형이 계산되었으며, 최종적으로 적절한 설계변수 들을 조정하여 열변형이 최소화 될 수 있는 새로운 구조를 제안하였다. A probe card is used in testing semiconductor wafers. It must maintain a precise location tolerance for a fine pitch due to highly densified chips. However, high heat transferred from its lower chuck causes thermal deformations of the probe card. Vertical deformation due to the heat will bring contact problems to the pins in the probe card, while horizontal deformation will cause positional inaccuracies. Therefore, probe cards must be designed with proper materials and structures so that the thermal deformations are within allowable tolerances. In this paper, heat transfer analyses under realistic loading conditions are simulated using ANSYSTM finite element analysis program. Thermal deformations are calculated based on steady-state temperature gradients, and an optimal structure of the probe card is proposed by adjusting a set of relevant design parameters so that the deformations are minimized.
4-스포크 형상의 스켈리튼 스틸 휠 디스크의 성형 해석
정태은(Tae-Eun Chung),인정제(Jeong-Je Yin),이동재(Dong-Jae Lee),고형규(Hyung-Gyu Ko),고정민(Jung-Min Ko) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
4-spoke typed skeleton steel wheel disk using high strength steel is developed. The skeleton steel wheel has many merits such as light weight, fuel economy and product price. But effective structure, profit forming process and other factors must be considered. Finite element simulation is done to examine the draw processes. The desirable model for drawing process is proposed from the detailed simulation.
김경모(Kyung-Mo Kim),인정제(Jeong-Je Yin) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.2
Springback is a very typical dimensional discrepancy phenomenon, which occurs usually on the final stamping parts after the tool loading is removed. Variation of springback leads to amplified variations and problems during assembly of the stamped components, in turn, resulting in quality issues. The variations in the properties of the incoming material and process parameters are the main causes of springback variation. In this research, a robust design methodology which combines orthogonal array based experimental design and design space reduction skim to reduce the springback variation for advanced high strength steel parts in sheet metal forming is suggested. The concept of design space reduction is adapted in the experimental design setup to improve the quality of the obtained solution. The effectiveness of the proposed procedures is illustrated through a robust design of springback in metal forming process of a cross member of auto body.
프레스-금형 일체 구조해석에 의한 차체용 블랭크 홀더의 번형 최적화
이현수(Hyeon-Su Lee),인정제(Jeong-Je Yin),채수원(Soo-Won Chae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
During forming of large automotive body panel, die components deflect due to the forming loads transmitted through the contact between various press and die components. Because die deflection results in forming defects and non-uniform material flow, time consuming corrective action to maintain uniform gap between dies, so called die spotting, should be done before the completion of dies. In this study, to predict the die deflection accurately, a structural analysis procedure considering the deformation of press-die assembly and the thickness variation of blank simultaneously is presented. The analysis procedure is applied to the optimization of the position and height of balance block for simplified automotive model die. The optimization results show much improved contact state between the blank and dies.