Patent ID: 7806031

Claim:
An apparatus for fine blanking of workpieces from a material ( 1 ), comprising: a press plate ( 10 ) having a V-ring ( 11 ), which is under pressure from a V-ring cylinder ( 13 ) comprising a V-ring piston rod ( 15 ) connected to a V-ring piston ( 12 ) disposed opposite to and in support of the V-ring ( 11 ) of the press plate ( 10 ), and a blanking punch ( 9 ) which is guided in the press plate ( 10 ) and to which a die plate ( 17 ) with counterholder ( 16 ) is assigned at a ram ( 7 ), wherein the ram ( 7 ) is supported against at least one compensation cylinder ( 22 ) and against at least one main cylinder ( 19 . 1 , 19 . 2 ), and wherein the at least one compensation cylinder ( 22 ) is hydraulically connected to the V-ring cylinder ( 13 ) through a hydraulic connection ( 25 ) and is in hydraulic equilibrium with the V-ring cylinder ( 13 ), said hydraulic connection ( 25 ) also having a connection ( 26 ) to an oil tank via a logic valve ( 27 ).