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더블액션 압출공정을 적용한 요크의 복합냉간단조 유한요소해석
김현민(H. M. Kim),김연구(Y. K. Kim),박용복(Y. B. Park) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
A conventional motor driving power steering system is composed of yoke, ring, resin and shaft. The yoke is manufactured by welding it after bending of a metal sheet. The Precision cold forging has been carried out in order to remove a defect due to welding. A General forging has caused the decrease of productivity because of two-stage forging. The finite element analysis for a conventional forward-backward combined extrusion process has tried out, which has brought out unfilling of lower part of a prodcut. The authors have proposed the double-action complex extrusion process with single stage as a new process to eliminate a unfilling defect. The process has proven to be optimal from the comparison for flow pattern, load and effective stress with a conventional combined extrusion process.
더블-액션 압출공정을 적용한 전동조향장치용 토션조인트 요크 개발
김현민(H. M Kim),김연구(Y. K Kim),박용복(Y. B. Park) 한국소성·가공학회 2012 소성가공 : 한국소성가공학회지 Vol.21 No.8
The yoke, a component of conventional motor-driven power steering system, often contains welding defects from its manufacturing process. To eliminate these defects, the precision cold forging process has been tried. In this study, the double-action complex forging has been used to manufacture a torsion joint yoke. The backward extrusion proved faster than the forward extrusion in forging of the product. The double-action complex forging process utilized an upper die composed of a punch, a punch guide, a disc spring and a coil spring. The forged material pushes up the punch guide, and then the disc spring and the coil spring balances the backward extrusion force. Consequently, the flow of material was essentially in the forward direction, resulting in a successful forging operation. The forging load of Al 6061-T6 was higher than that of the automotive structural hot rolled plate.