DEVICE FOR SHEET MATERIAL STAMPING Russian patent published in 1994 - IPC

FIELD: plastic metal working. SUBSTANCE: device has a container with a flexible slab and the lower clamp as well as the outer slide block with the upper clamp and the interior slide block with a punch. The device has a means of absorbing the redundant volume of the flexible slab which can be formed by the container bottom or by one of the lateral walls of the container or by the upper clamp. The mentioned means in its turn has a unit controlling its own displacement with a re-entry tool and with a movable piston. The latter is a member which is in direct contact with the flexible slab and its displacement is regulated with several variants of mechanisms. One of them is made as a multiplate brake controlled through cranks by hydraulic cylinders. Another variant of mechanism is made as non-self-braking screw equipped with a belt brake and a hydraulic cylinder to regulate the belt tightening. Several variants of mechanism are fulfilled hydraulic. EFFECT: device keeps from the deformation of the stamped article at the expense of controlling the reaction of expansion of the flexible material constituting the slab. 15 cl, 12 dwg