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차성훈(S.-H. Cha),신명수(M.-S. Shin),김종호(J.-H. Kim),나승우(S.-W. Ra),김종봉(J.-B. Kim) 한국소성·가공학회 2009 소성가공 : 한국소성가공학회지 Vol.18 No.2
A shaft for laser printers has to be produced with high dimensional accuracy of a few micrometers. Most companies produce the shaft, therefore, by machining. These days, forging process is tried to be employed in manufacturing the shaft for productivity. In this study, the dimensional inaccuracy of straightness is studied and the underfill is not focused because the shaft shape is simple and the load capacity of press is sufficient. The straightness and concentricity of the shaft is important for the operation of a laser printer. Many design parameters such as preform shapes, tooling dimensions, forging load, and billet geometries may affect on the dimensional accuracy. In the forging process of shafts, a billet which is cut from wires is used. The billet, therefore, may be a little bit curved but not always straight. The elastic recovery is considered to cause the dimensional inaccuracy. Therefore, the effect of the forging load on the elastic recovery and straightness is investigated through the finite element analyses using DEFORM-3D and ABAQUS.
브레이크 제어 방식에 기초한 차량 스핀 제어 시스템의 시뮬레이션
차성훈(S.H.Cha),송재복(J.B.Song) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this research, “spin control systems” has been developed that reduce the vehicle’s spin occurred by high speed cornering or disturbances. Here, the spin means the unwanted yawing motion about the vertical axis of the vehicle’s weight center. This system determines the driver’s desired yaw rate from the information on the steering angle and other driving conditions and compares it with the actual yaw rate from the yaw rate sensor. When the spin is detected, the proper brake control action is applied, thus leading to the reduction on the excessive spin of the vehicle. To this end, the driver model and yaw rate estimation scheme has been developed. Based on simulations for various driving situations, it is shown that the proposed spin control systems stabilize the vehicle’s behavior by reducing the excessive spin and help the driver perform the stable steering operation.<br/>
마이크로 박판 미세 패턴 성형공정에 대한 해석 효율성 연구
차성훈(S. H. Cha),신명수(M. S. Shin),김종호(J. H. Kim),김종봉(J. B. Kim),이혜진(H. J. Lee),송정한(J. H. Song) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Roll forming process is one of important metal processing technology because the process is simple and economical. These days, roll forming process is tried to be employed in manufacturing the circuit board, barrier ribs and solar cell plate for productivity. However, it is difficult to apply to the forming of micro scale or sub-micro scale pattern. In this study, the roll forming processing for the micro scale is designed and analyzed. In this study, the forming of micro pattern for solar cell plate by incremental roll forming process is analyzed. The solar cell plate may have thousands of patterns, and the analysis of forming considering all the patterns is impossible due to the computational costs. In this study, analyses are carried out for various numbers of patterns and the results are compared. It is shown that the analyses results with four row patterns and twelve row patterns are same. So, it is considered that the analysis can be carried out for only four rows of pattern for the design of incremental roll forming process.
차성훈(S. H. Cha),신명수(M. S. Shin),김종호(J. H. Kim),김종봉(J. B. Kim),송정한(J. H. Song),이혜진(H. J. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Roll forming process is one of important metal processing technology because the process is simple and economical. These days, roll forming process is tried to be employed in manufacturing the circuit board, barrier ribs and solar cell plate for productivity. However, it is difficult to apply to the forming of micro scale or sub-micro scale pattern. In this study, the roll forming processing for the micro scale is designed and analyzed. In this study, the forming of micro pattern for solar cell plate by incremental roll forming process is analyzed. The solar cell plate may have thousands of patterns, and the analysis of forming considering all the patterns is impossible due to the computational costs. In this study, analyses are carried out for various numbers of patterns and the results are compared. It is shown that the analyses results with four row patterns and twelve row patterns are same. So, it is considered that the analysis can be carried out for only four rows of pattern for the design of incremental roll forming process. Also experiment is carried out process that is designed through simulation.
차성훈(S.-H. Cha),신명수(M.-S. Shin),김종호(J.-H. Kim),이혜진(H. J. Lee),김종봉(J.-B. Kim) 한국소성가공학회 2009 금형가공 심포지엄 Vol.2009 No.11
Roll-to-roll forming process is one of important metal processing technology because the process is simple and economical. These days, with these merits, roll-to-roll forming process is tried to be employed in manufacturing the circuit board, barrier ribs and solar cell plate. However, it is difficult to apply to the forming of micro scale or sub-micro scale pattern. In this study, the roll forming processing for the micro scale is designed and analyzed. The forming of micro pattern for photovoltaic plate of a solar cell by incremental roll forming process is analyzed. The solar cell plate may have millions of patterns, and the analysis of forming considering all the patterns is impossible due to the computational costs. In this study, analyses are carried out for various numbers of patterns and the results are compared. It is shown that the analyses results with four row patterns and twelve row patterns are same. So, it is considered that the analysis can be carried out for only four rows of pattern for the design of incremental roll-to-roll forming process. Also formability is analyzed for various protrusion shapes at various forming temperatures.
Crack 발생 예측을 통한 Lead Screw 공정설계
신명수(M. S. Shin),차성훈(S. H. Cha),김종봉(J. B. Kim),김종호(J. H. Kim),나승우(S. W. Ra) 한국소성가공학회 2009 금형가공 심포지엄 Vol.2009 No.11
This paper presents the numerical analysis of thread rolling. Firstly, the analysis is focused on the effective analysis conditions that guarantee the reliability of the analysis results. The investigated parameters are the number of teeth and the number of elements. Using the analysis results, the number of elements and the number of teeth that guarantee the results are found. And then, the effects of the process parameters such as tool shape and temperature on the thread rolling are investigated. The analysis is carried out using DEFORM-3D. The results show that the flank angle and crest round have an effect on the thread rolling load. It is also shown that temperature has significant effects on the effective strain distribution, rolling load, and crack initiation. The crack initiation is predicted using the Cockcroft-Latham criterion.