PURPOSE: To provide the titled die enabling the adjustment of the rate of reduction in area without worsening the surface condition after working by tapering the inner peripheral face of an outer race.
CONSTITUTION: A ball 5 is moved in the direction of the center shaft of a die in case of making an area reduction rate bigger and is moved in the reverse direction for making the reduction rate smaller since the ball 5 is moved in radial direction by the taper of the inner peripheral face of an outer race 2. In this case it is preferable to adjust the position of the ball 5 by changing the thickness of a spacer 8 or pressure backing plate 4 to receive the force in axial direction so that the force which the ball 5 is pressed to the axial direction of the die is not received with the tapered surface. The method controlling the position in the die direction of a thrust bearing 6 by an oil pressure is preferable especially in case of changing the reduction rate during the work.
SUZUKI KAZUTAKA
KUME MASAICHI
YOSHIDA HARUO
MACHIDA MITSUHIDE
TAZAKI YOSHIO
TAGUCHI AKIRA
| JP31008854A |
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