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Die design in the complex shape drawing of cross roller guide to improve the dimensional accuracy
이상곤,J. E. Lee,B. M. Kim,S. M. Kim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.10
A drawing process allows for a smooth and clean surface, metal savings, low cost tooling, and closely controlled dimensions to be obtained in long products that have constant cross-sections. Recently, rods having irregular sections more complex than a rectangle or ellipse are necessary to produce mechanical parts. A cross roller guide is one of the parts produced by complex cold-shaped drawing. A cross roller guide has a linear bearing system that rolls along a guide way. A cross roller guide is one of the most important components in terms of equipment because the quality of the linear rail influences the precision linear motion. Therefore, the final dimensional accuracy of the linear rail in cold-shaped drawing is very important. The aim of this study is the optimization of the optimal die angles to improve the dimensional accuracy and straightness of the final product using design of experiment, FE-simulation, and the Taguchi method. Based on the analytical results, experiments for real industrial products have also been implemented to verify the results. From the experimental results, it was possible to improve the dimensional accuracy and straightness of final product.
980MPa급 초고장력 강판의 자동차 프런트 사이드 멤버 부품 성형에 관한 연구
차승훈(C. H. Cha),이상곤(S. K. Lee),고대철(D. C. Ko),김병민(B. M. Kim) 한국소성·가공학회 2009 소성가공 : 한국소성가공학회지 Vol.18 No.1
This paper is concerned with forming technology of an automotive front side member part with ultra high strength steel sheet of DP980. The forming technology considered in this paper is the draw & form type, which installs the upper pad and lower pad to produce the complicated shape of ultra high strength steel sheet. In order to produce sound product, comparison between form type and draw & form type and between draw type and draw & form type are investigated by FE-analysis. FE-analysis is carried out with commercial sheet metal forming analysis S/W, DYNAFORM. It was shown from FE-analysis that the draw & form type satisfied the required specifications such as the dimensional accuracy and soundness of automotive front side member part. The effectiveness of the analytical result was verified by the experiment. From this investigation, the draw & form type is proved to be able to supply useful forming technology in forming ultra high strength steel.