| 摘要 |
PURPOSE:To perform empty drawing and finish forming simultaneously and to form a cushion part on a disk correctly by providing a rough forming roll and a finish forming roll on a common supporting frame and changing feeding speed according to the shape of drawing. CONSTITUTION:A material W is inserted between a die 5 and a press plate 11, and the material W is held by inserting a projection 11a of the press plate 11 into the center hole Wa of the material W. A rough forming roll 8 is mounted to the supporting frame 12 in front of a finishing roll 9 leaving preceding distance and driven by hydraulic motors 57, 58. After moving at high speed in a feeding section until forming rolls 8, 9 draw near to the material W, the empty drawing is made by the rough forming roll 8 shifting to inertial rotation, and a rim flange base of required shape in which thickness is lessened gradually is formed by the finish roll 9. A disk having accurate concavity can be drawn by the change of shifting speed. |
