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자동차 시트용 랙기어 성형을 위한 파인블랭킹 복합성형공법 개발
홍일성(Ilseong Hong),정창식(Changsik Joung),김우진(Woojin Kim),이덕영(Dugyoung Lee) 한국자동차공학회 2014 한국자동차공학회 지부 학술대회 논문집 Vol.2014 No.4
The fine blanking is a process of stamping which provides thick sheet metal parts with fine sheared edges and close dimensional accuracy over whole material thickness in single blanking operation. The rack gear in automotive seat must have fine sheared surface to prevent noise during adjusting its height and angle. In this paper, fine blanking and bending process were adopted to make tooth face of rack gear using progressive die. Stamping and spring back analyses were done to decide stamping conditions including padding force. For dimensional accuracies of rack gear, angle and offset amount of bending pad in progressive die were corrected several times during trying out die.