A study on the clamping type forging of helical gear

헬리컬기어의 구속형 단조에 관한 연구

  • Choi, J.C. (Sheet Products Process Research Group, Busan National University) ;
  • Choi, Y. (Dept.of Mechanical Design Engineering, Graduate School of Busan National University) ;
  • Tak, S.J. (LG Idustrial System) ;
  • Cho, H.Y. (Dept. of Mechanical Engineering, Chungbuk National University)
  • 최재찬 (부산대학교 정밀정형 및 금형가공 연구센터) ;
  • 최영 (부산대학교 대학원 기계설계공학과) ;
  • 탁성준 (LG산전(주) 전력연구소 메카닉스연구팀) ;
  • 조해용 (충북대학교 기계공학부)
  • Published : 1997.11.01


In this paper, the clamping type forging of helical gears has been investigated. Clamping type forging is an operation in which the product is constrained to extrude sideways through an orifice in the container wall. Punch is cylindrical shaped. The punch compresses a cylindrical bilet placed in a die insetr. As a consequence the material flows in a direction perpendicular to that of punch movement. The forging has been analysed by using the upper-bound method. A kinematically admissible velocity field has been developed, wherein, an involute curve has been introduce to re4present tooth profile of the gear. Numerical calculations have been carried out to investigate the effects of various parameters, such as module, number of teeth, helix angle, friction factor and initial height of billet on the forging of helical gears. Some firgiing experiments were catrried out with aluminium alloy to show the validity of the analysis. Good agreement was found between the predicted values of the forging load and obtained from the experimental results.