| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat forging method for a billet capable of forging a material, whose cross-sectional shape is polygonal or circular, into a billet small in the depth of recesses and having a polygonal or circular shape. SOLUTION: In the heat forging method for forging the material into the billet whose cross-sectional shape is circular or polygonal by feeding the material, whose cross-sectional shape is polygonal or circular, in the longitudinal axial direction at the opening time of a pair of round-grooved anvils or V- grooved anvils making opening/closing operation, and rotating the material around its axial center, performing the forging for pressing down the material a plurality of times at the closing time of the round-grooved anvils or the V- grooved anvils, the rotation angle around the axial center of the material at each opening time of the anvils is made larger than 45 deg. and not more than 75 deg..
|
