| 摘要 |
Improvement in apparatus for forging crankshafts and like workpieces. This improvement is characterized in that an upper crankpin die is mounted on a piston movable in relation to an upper cross member which is actuated by the ram of a forging press, said piston being responsive to a hydraulic ram having its cylinder carried by said cross member. The pressure developed in said ram is adjustable by means of a discharge valve set according to the dimensions of the workpiece to be forged, said valve permitting of performing the forging operation in two steps, i.e., firstly upsetting the metal while offsetting the crankpin, then forging the crankshaft webs at the end of the upsetting step. |
