Patent ID: 7059165

Claim:
A hydromechanical closing device, in particular for lateral extrusion, having two die halves (M 1 , M 2 ) which can be moved relative to one another and can be closed together, and two punches (S 1 , S 2 ) which can be moved at the same speeds relative to the closed die halves (M 1 , M 2 ), a first hydraulic piston (K 1 ), on which the first die half (M 1 ) is arranged, being mounted in a displaceable manner in an axially movable first hydraulic cylinder (Z 1 ), and a second hydraulic piston (K 2 ) being mounted in a displaceable manner in a second hydraulic cylinder (Z 2 ) fixed to the frame, the second die half (M 2 ) being fixed to the frame and the second punch (S 2 ) being arranged on the second hydraulic piston (K 2 ), characterized in that the first hydraulic cylinder (Z 1 ) is connected to at least one third hydraulic cylinder (Z 3 ; Z 3 E ; Z 3 S ), in which a third hydraulic piston (K 3 ; K 3 E ; K 3 S ) is guided, the third hydraulic piston (K 3 ; K 3 E ; K 3 S ), in the closed state of the closing device, acts on a fourth hydraulic piston (K 4 ; K 4 E ; K 4 S ), which is guided in a fourth hydraulic cylinder (Z 4 ; Z 4 E ; Z 4 S ) fixed to the frame, the first hydraulic cylinder (Z 1 ) is connected to the third hydraulic cylinder (Z 3 ; Z 3 E ; Z 3 S ) in such a way that the pressure medium (D) displaced from the first hydraulic cylinder (Z 1 ) during a feed movement flows into the third hydraulic cylinder (Z 3 ; Z 3 E ; Z 3 S ), so that the third hydraulic piston (K 3 ; K 3 E ; K 3 S ) moves the fourth hydraulic piston (K 4 ; K 4 E ; K 4 S ) in the feed direction, in such a way that pressure medium (D) is displaceable from the fourth hydraulic cylinder (Z 4 ; Z 4 E ; Z 4 S ) by the fourth hydraulic piston (K 4 ; K 4 E ; K 4 S ) into the second hydraulic cylinder (Z 2 ) and thus the requisite forming pressure can be applied to the second hydraulic piston (K 2 ), so that the punches (S 1 , S 2 ) move toward one another.