The conventional closed-die forgings had been applied to the forging of spur gears. But the forgings require high forging-pressure. In this paper, new precision forging technology have been developed. The developed technology is two steps forging process. Good shaped products are forged successfully with lower forging-pressure than those of conventional forging. The accuracy of the forged spur gear obtained by new precision forging technology is set nearly equal to that of cut spur gear of fourth and fifth class in Korean industrial standard.
Choi, Y. ; Jung, S.Y. ; Kim, B.M. ; Choi, J.C. 1999. "An Analysis of Cold Foging at Final State Using Rigid-Plastic FEM" 소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics, 8(1): 108~115