B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
B30B 15/28 (2006.01) B30B 15/16 (2006.01)
Patent
CA 2705646
The invention relates to a device and a method for preventing a tool consisting of an upper and an lower part from breaking during fine blanking and/or forming in a press. The invention has the task to provide a solution for preventing a tool from breaking during fine blanking and/or forming a work piece, which is able to simplify the construction and to reduce the quantity of parts simultaneously reducing the costs, to absorb high tilting moments and to compensate the kinetic energy of the drive during a return stroke even before the press is switched off. This task is solved by providing between V-shaped projection piston (9) and V-shaped projection pins (11) a touch piston (10), that with the V-shaped projection piston (9) on the one hand and with the V-shaped projection pins (11) and the V-shaped projection pressure plate (12) on the other hand develops an axially to each other movable arrangement, wherein the V-shaped projection piston (9) is allocated a pressure room (16) to which a preloading pressure (P1) of the hydraulic system can be admitted, between V-shaped projection piston (9) and touch piston (10) is allocated a pressure room (24) to which a touch piston pressure (P2) can be admitted and the touch piston (10) is allocated a further pressure room (31) to which can be admitted a differential pressure (P3), wherein the pressure rooms (16, 24, 31) each via one connection (17, 25, 32) in the V-shaped projection cover (15) and the pressure rooms (24, 31) respectively via separate positioned in the main cylinder (3) conduits (23, 29) are connected with the hydraulic system for admitting pressure to the V-shaped projection piston (9) and the touch piston (10) opposite to the effective direction of the preloading pressure (P1), and to provide a touch table (7) suspendedly hold against an applied to the main plate (6) fixing means (46) in a determined detection distance (TA) weight compensated by the main plate (6), to which detection distance (TA) is allocated a sensor (52) that in case of a change of the detection distance (TA) transmits a signal to the computer (57) to immediately stop the press to protect the upper part of the tool (50).
Cristofaro Alfio
Ochsenbein Juerg
Schaltegger Markus
Feintool Intellectual Property Ag
Riches Mckenzie & Herbert Llp
LandOfFree
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