Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Development of a Torsion Joint Yoke for Motor-Driven Power Steering System Using a Double-Action Extrusion Process

더블-액션 압출공정을 적용한 전동조향장치용 토션조인트 요크 개발

  • Kim, H.M. (Department of Mechanical Engineering, Kongju National University Graduate School) ;
  • Kim, Y.K. (Derim MTI) ;
  • Park, Y.B. (Department of Mechanical Engineering, Kongju National University)
  • Received : 2012.08.27
  • Accepted : 2012.11.26
  • Published : 2012.12.01
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Abstract

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.

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References

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