A press system providing excellent energy efficiency for a whole press system and capable of achieving low prices is provided. A die cushion apparatus constituting a press system supports a cushion pad, includes a hydraulic cylinder which generates a die cushion load on the cushion pad when a slide of a press machine descends, the press machine includes a hydraulic cylinder which generates part of a press load on the slide when the slide descends. The pressure generation chamber of the hydraulic cylinder for generating a die cushion load and the pressure generation chamber of the hydraulic cylinder for generating part of the press load can communicate with each other via pipes and a first logic valve for a period during which the die cushion load acts.

A press system providing excellent energy efficiency for a whole press system and capable of achieving low prices is provided. A die cushion apparatus constituting a press system supports a cushion pad, includes a hydraulic cylinder which generates a die cushion load on the cushion pad when a slide of a press machine descends, the press machine includes a hydraulic cylinder which generates part of a press load on the slide when the slide descends. The pressure generation chamber of the hydraulic cylinder for generating a die cushion load and the pressure generation chamber of the hydraulic cylinder for generating part of the press load can communicate with each other via pipes and a first logic valve for a period during which the die cushion load acts.

A pressurizing device includes: a pressurizing unit that pressurizes a pressurized object by supplying a working fluid; a first cylinder mechanism that supplies the working fluid in a first cylinder to the pressurizing unit by output of a first drive source; a second cylinder mechanism that supplies the working fluid in a second cylinder to the pressurizing unit by output of a second drive source; and a control device that controls the first drive source and the second drive source, in which the control device performs transition control to transition to a second supply state of supplying the working fluid from the second cylinder mechanism to the pressurizing unit when satisfying a remaining amount condition of the working fluid in the first cylinder of the first cylinder mechanism in a first supply state of supplying the working fluid from the first cylinder mechanism to the pressurizing unit.

A hydraulic press includes a press assembly moveable in relation to a support assembly by actuation of an actuator to provide a compressive force between the top platen and the bottom platen. The press assembly includes a top platen, a counter balance, and at least one platen guide rod interconnected between the top platen and the counter balance. The support assembly includes a bottom platen, a base frame, and at least one counter balance guide rod interconnected between the bottom platen and the base frame. The actuator is mounted between the bottom plate and the counter balance. The actuator is interchangeable with another actuator to change the compressive force of the hydraulic press.

A hydraulic press includes a press assembly moveable in relation to a support assembly by actuation of an actuator to provide a compressive force between the top platen and the bottom platen. The press assembly includes a top platen, a counter balance, and at least one platen guide rod interconnected between the top platen and the counter balance. The support assembly includes a bottom platen, a base frame, and at least one counter balance guide rod interconnected between the bottom platen and the base frame. The actuator is mounted between the bottom plate and the counter balance. The actuator is interchangeable with another actuator to change the compressive force of the hydraulic press.

A hydraulic forging press machine and a control method, whereby surging of the forging load or dead zones where the forging speed goes to zero is suppressed, and forging is performed with high precision throughout a wider range than the prior art, from low to high load. Pressure cylinders have a main pressure cylinder configured so working fluid is supplied during forging, and secondary pressure cylinders are configured so supplying and stopping of the supply of working fluid thereto are switched in response to the forging load, head-side hydraulic chambers of the secondary pressure cylinders being connected to a head-side hydraulic chamber of the main pressure cylinder via electromagnetic switching valves. Only the main pressure cylinder is used until the forging load exceeds a set load, and the number of secondary pressure cylinders used is sequentially increased as the forging load increases after the forging load exceeds the set load.

A hydraulic forging press machine and a control method, whereby surging of the forging load or dead zones where the forging speed goes to zero is suppressed, and forging is performed with high precision throughout a wider range than the prior art, from low to high load. Pressure cylinders have a main pressure cylinder configured so working fluid is supplied during forging, and secondary pressure cylinders are configured so supplying and stopping of the supply of working fluid thereto are switched in response to the forging load, head-side hydraulic chambers of the secondary pressure cylinders being connected to a head-side hydraulic chamber of the main pressure cylinder via electromagnetic switching valves. Only the main pressure cylinder is used until the forging load exceeds a set load, and the number of secondary pressure cylinders used is sequentially increased as the forging load increases after the forging load exceeds the set load.

A pressurizing device includes: a pressurizing unit that pressurizes a pressurized object by supplying a working fluid; a first cylinder mechanism that supplies the working fluid in a first cylinder to the pressurizing unit by output of a first drive source; a second cylinder mechanism that supplies the working fluid in a second cylinder to the pressurizing unit by output of a second drive source; and a control device that controls the first drive source and the second drive source, in which the control device performs transition control to transition to a second supply state of supplying the working fluid from the second cylinder mechanism to the pressurizing unit when satisfying a remaining amount condition of the working fluid in the first cylinder of the first cylinder mechanism in a first supply state of supplying the working fluid from the first cylinder mechanism to the pressurizing unit.

A press device includes a slide configured to hold a first die, a holding portion configured to hold a second die, a reciprocating mechanism that causes the slide to reciprocate in a stroke direction in which the first die and the second die move closer to or away from each other, and a pressurizing mechanism that holds the second die while pressurizing the second die toward the first die with a stroke shorter than that of the reciprocating mechanism in a state where the first die and the second die are moved close to each other by the reciprocating mechanism.

A press device includes a slide configured to hold a first die, a holding portion configured to hold a second die, a reciprocating mechanism that causes the slide to reciprocate in a stroke direction in which the first die and the second die move closer to or away from each other, and a pressurizing mechanism that holds the second die while pressurizing the second die toward the first die with a stroke shorter than that of the reciprocating mechanism in a state where the first die and the second die are moved close to each other by the reciprocating mechanism.