B26D2007/189

APPARATUS AND METHOD FOR STRIPPING AWAY/PUSHING OUT A PUNCHED GRID/INTERNALLY FORMED PART AND EJECTING A BLANKED PART IN A PRECISION BLANKING PRESS
20170008186 · 2017-01-12 ·

The invention relates to an apparatus and method for stripping away/pushing out a punched grid/internally formed part and ejecting a blanked part in a precision blanking press.

The object of the invention is to provide an apparatus and a method for stripping/pushing out a punched grid and for ejecting a blanked part from a die in a precision blanking press, wherein the force of stripping/pushing out and ejection can be adjusted independent of the knife-edged ring force and the counterstay force while reducing the mass of the knife-edged ring and counterstay pistons, increasing the stripping/pushing and ejection speeds, and at the same time simplifying the hydraulic circuit.

This is achieved by providing that the knife-edged ring piston (38) and a stripping/pushing piston (30) form a separate constructive unit and that the counterstay piston (64) and an ejecting piston (65) form a separate constructive unit in the top and the base (16, 53), respectively, with pressure chambers (31a, 31b; 68) that are independent of one another for the stripping/pushing piston (30) on the one hand and for the ejecting piston (65) on the other, wherein the pressure chambers (31a, 31b; 68) of the stripping/pushing piston (30) and the ejecting piston (65) are in mutual connection by way of a first controllable hydraulic circuit (92) of the hydraulic system (34), and wherein the pressure chambers (40; 69) of the knife-edged ring piston (38) and the counterstay piston (64) are in mutual connection by way of a second controllable hydraulic circuit (93).