Die cushion apparatus
AssigneesKomatsu Ltd., Komatsu Industries Corporation
InventorKiyokazu Baba
Life of this patent
Estimating the term…
Abstract
A cylinder is formed in the lower portion of a cushion pad, and a piston coupled to an upper end of a rod is slidably contained in the cylinder. The rod is coupled to a rotary shaft of a servomotor. An oil pressure chamber is formed of an inner wall surface of the cylinder and a wall surface of the piston. The axial center of the oil pressure chamber is identical with the axial center of the rod. The pressure oil for alleviating an impact is filled in the oil pressure chamber. The pressure oil filled in the oil pressure chamber absorbs a force operating instantaneously at the cushion pad. According to this structure, the impact generated in a press machine can be alleviated.
Claims5
A die cushion apparatus, comprising:
- a cushion pad being arranged below and supporting a plurality of cushion pins within a press machine;
- a servomotor for raising or lowering the cushion pad while applying an upward energizing force;
- a support unit including a rod for transmitting a power of the servomotor to the cushion pad and supporting the cushion pad from below;
- and
- a hydraulic chamber filled with liquid being arranged for absorbing an impact operating at the cushion pad, the hydraulic chamber being adjacent the cushion pad and being located and between the cushion pad and the support unit and on a coaxial center of the support unit.
Dependencies are inferred from the claim text.