A Study of the Twisting and Extrusion Process of the Product with Trapezoidal Helical Fin from the Round Billet

원형빌렛으로부터 나선형 사다리꼴 핀을 가진 제품의 비틀림 압출가공법에 관한 연구

  • 김한봉 (부경대학교 기계공학과) ;
  • 진인태 (부경대학교 기계 자동차공학부)
  • Published : 1999.04.01

Abstract

The twisting and extrusion process of the product with trapezoidal helical fin from the round billet is developed by the upper bound analysis. The twisting of extruded product is caused by the twisted die surface connecting the die entrance section and the die exit section linearly. In the analysis, the rotational velocity in angular direction is assumed by the multiplication of radial distance and angular velocity. The angular velocity is increased linearly by axial distance from the die entrance. The increase rate of angular velocity is determined by the minimization of plastic work. The results of the analysis show that the angular velocity of the extruded product increases with the die twisting angle, the reduction of area, and decreases with the die length, the friction condition.

Keywords

References

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