Stretch forming die
AssigneeFca US LLC
InventorsDajun Zhou, Changqing Du, Robert D Miller, Richard J Siemen
Life of this patent
Estimating the term…
Abstract
A stamping press binder assembly for forming a finished stamped product from a blank includes an upper die for at least partially forming the finished stamped product, a stationary punch, an inner lower binder, and an outer lower binder. The inner and outer lower binders are both supported by a single cushion.
Claims16
A stamping press binder assembly for forming a finished stamped product from a blank, the press binder assembly comprising:
- an upper die for at least partially forming the finished stamped product;
- a stationary punch positioned below the upper die;
- an inner lower binder;
- an outer lower binder moveably positioned on the inner lower binder;
- and
- a single cushion;
- wherein the inner and outer lower binders are both supported by the single cushion, and
- wherein the cushion is programmable and includes a plurality of cushion pins extending between the inner lower binder and at least one first high pressure fluid cylinder, and wherein the outer lower binder is supported by a die cylinder having a piston and a second high pressure fluid cylinder, wherein the binder assembly further comprises a controller configured to:
- set the programmable cushion with a first predetermined cushion force and move the upper die downward a first predetermined distance;
- set the programmable cushion with a second predetermined cushion force and move the upper die further downward a second predetermined distance such that the die cylinder is at least partially compressed;
- and
- set the programmable cushion with a third predetermined cushion force and move the upper die further downward a third predetermined distance such that a plurality of stinger teeth on an upper surface of the inner lower binder penetrate the blank to facilitate substantially locking sheet draw-in.
A method of forming a finished stamped product from a blank in a stamping press binder assembly having an upper die, a stationary punch, an inner lower binder, an outer lower binder, and a die cylinder disposed on the inner lower binder and supporting the outer lower binder, wherein the inner and outer lower binders are both supported by a single cushion, the method comprising:
- positioning the blank on the outer lower binder and the stationary punch;
- setting the cushion with a first predetermined cushion force and moving the upper die downward a first predetermined distance;
- setting the cushion with a second predetermined cushion force and moving the upper die further downward a second predetermined distance such that the die cylinder is at least partially compressed;
- and
- setting the cushion with a third predetermined cushion force and moving the upper die further downward a third predetermined distance such that a plurality of stinger teeth on an upper surface of the inner lower binder penetrate the blank to facilitate substantially locking sheet draw-in to reduce springback.
Dependencies are inferred from the claim text.