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김광희(Kwang-Heui Kim),윤문철(Moon-Chul Yoon),곽재섭(Jae-Seob Kwak) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.2
In this study, we investigated whether the interference occurring in forming roll surfaces could be eliminated by increasing the radius of the variable section forming rolls. The surfaces of the rolls capable of forming products with different flange heights and bend angles with the bend line tilted at an angle of 1° from the longitudinal axis were created using the general CAD software CATIA. Roll interferences were determined for the change in the forming roll radius. The minimum gaps between the upper and lower roll surfaces were measured for the change in the forming roll radius, and the roll interferences were calculated from the difference between the measured value and the thickness of the product. It was observed that the thickness of the product had a slight effect on the roll interference when the thickness was between 0.8 and 1.2 mm. It was also observed that the roll interference could be eliminated by increasing the roll radius.
김형종(H. J. Kim),정동원(D. W. Jung),최두선(D. S. Choi),제태진(T. J. Jae),박재현(J. H. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Sandwich structures, which are composed of a thick core between two thin faces, are commonly used in many engineering applications because they combine high stiffness and strength with low weight. Depending on the application of a particular sandwich structure, various types of cores can be used. The production of sandwich sheets by a rolling process, which is a more efficient and economical approach compared to other types of processes, has become an increasingly important subject of study. In this paper, we have studied the embossing structure of sheet type and developed embossing roll mold with Φ3 pattern and roll forming system.
가변롤성형을 이용한 가변단면을 갖는 프로파일의 변형길이 분석에 관한 연구
박종철(J. C. Park),차명환(M. H. Cha),김돈건(D. G. Kim),남재복(J. B. Nam),양동열(D. Y. Yang) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Needs for profiles with variable cross-sections are increasing to meet industrial applications. Flexible roll forming is capable to fabricate profile with variable cross-sections. Span length which is a distance between each roll stand is important parameter to affect longitudinal strain on flange sections of profiles. And span length needs to be longer than deformation length of profiles during flexible roll forming to reduce unnecessary longitudinal strain on flange sections. In this study, deformation length is investigated. By studying shape parameters of profiles with variable cross-sections, the deformation lengths of profiles during flexible roll forming were analyzed. As radius curvatures and transition angles on transition zones increase, deformation length increases.
한명철(Myung-Chul Han),성창민(Chang-Min Sung),김정관(Jung-Kwan Kim),권유홍(Yu-Hong Gwon) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
A cable tray is a fixture to support and protect electrical and communication cables. In this study, a roll-forming analysis is conducted to produce an all-in-one cable tray. The number of process stands is calculated using an empirical formula. By applying bending methods to the design of the roll flower pattern, the final process stands and forming angles are determined. The shape and stress variations in the cable tray are modeled and observed by roll forming analysis using LS-DYNA Software. The width of the side rail and the maximum stress on all stands does not exceed the reference values. The forming machine and rolls are manufactured based on the results of the roll forming analysis. In addition, all-in-one cable trays satisfy the National Electrical Manufacturers Association standards when they are manufactured according to this design.
정상화,이상희,김광호,김주환,신상문 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
The slide rail is the latest device driven by rectilinear reciprocating motion. It is used for the great deal of fields with the progress of high technology in these days: for example, telecommunication device, measurement device, copy machine, refrigerator, car, office furniture and wood furniture, etc., But it is very difficult to produce the press mold that has a. forming of narrow thickness, straight quality and high accuracy. Recently Roll forming technique is used to fabricate the slide rail. To evaluate the characteristics of each path shape is not easy because the roll forming passes the sheet metal in the continuously arranged multistage roll stands. In this paper, Roll forming simulation is performed to make U-channel using SHARP-RF. Longitudinal strain and total effective strain are evaluated. In addition, Bowing and Camber which is one of the several defects are measured.
정상화,이상희 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
Roll forming process is one of the most widely used processes in the world for forming metals. It can manufacture goods of the uniform cross section throughout the continuous processing. However, analysis of process is very difficult because of the inherent complexity of the process. For this reason, the computer analysis methods such as the FEM(Finite Element Method) and the FDM(Finite Difference Method) are frequently used in roll forming design. In this paper, the under rail composed of upper member, center member and lower member is modeled. Also the flower pattern of the upper member is designed and the roll forming process is simulated. The upper member is designed using constant arc length forming method and constant radius forming method for excellent design. The cold rolled carbon steel sheet(SCP-1) is used in this simulation, and a flow stress equation is set up through the tensile test. Each types are simulated and compared with the longitudinal strain using SHAPE-RF software. In addition, the numerical magnitude of camber and bow are predicted from the results of the simulation.
정상화(Sang Hwa Jeong),이상희(Sang Hee Lee) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.10
Roll forming process is one of the most widely used processes in the world for forming metals. It can manufacture goods of the uniform cross section throughout the continuous processing. However, analysis of process is very difficult because of the inherent complexity of the process. For this reason, the computer analysis methods such as the FEM(Finite Element Method) and the FDM(Finite Difference Method) are frequently used in roll forming design. In this paper, the under rail composed of upper member, center member and lower member is modeled. Also the flower pattern of the upper member is designed and the roll forming process is simulated. The upper member is designed using constant arc length forming method and constant radius forming method for excellent design. The cold rolled carbon steel sheet(SCP-1) is used in this simulation, and a flow stress equation is set up through the tensile test. Each types are simulated and compared with the longitudinal strain using SHAPE-RF software. In addition, the numerical magnitude of camber and bow are predicted from the results of the simulation.
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.
김광희(Kwang-Heui Kim) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.4
Roll forming process is simulated with a commercial FEM code LS-DYNA. The rolls are treated as rigid bodies rotating with a constant angular velocity. The strip and the rolls are modeled with 4-node plate elements. It is assumed that the nodes along the front end of the strip move along paths given by sine functions. It is found that the analysis can be applied to the optimal design of forming rolls. With these analyses, it is expected that forming defects can be avoided and process development efforts can be reduced.