Abstract: A part of kinetic energy during lowering of a slide of a press machine is converted into oil hydraulic energy by a first oil hydraulic cylinder, and the converted oil hydraulic energy (hydraulic oil having boosted first system pressure) is stored in a first accumulator. The hydraulic oil having the first system pressure stored in the first accumulator is discharged in knockout process, a second oil hydraulic cylinder that functions as a knockout cylinder is raised to perform knockout operation of a product worked by the press machine. Consequently, it is possible to perform knockout operation without using a dedicated driving source such as an oil pressure source and an air pressure source, and provide a low-cost hydraulic knockout device.

Abstract: To provide a die cushion device which is inexpensive, functional, and capable of locking completely (at or below the slide bottom dead center). The die cushion device includes a cushion pad, a hydraulic cylinder that moves the cushion pad up and down, and a hydraulic closed circuit connected to a die cushion pressure generation chamber of the hydraulic cylinder. The hydraulic closed circuit includes a cushion pad lowering pressure generation line and a second system pressure line in addition to a die cushion pressure generation line and a first system pressure line. When the cushion pad is locked at the bottom dead center, the cushion pad lowering pressure generation chamber is connected to the first system pressure line, and the die cushion pressure generation chamber is connected to the second system pressure line such that the cushion pad is held at or below the slide bottom dead center.

Abstract: In a method and an apparatus for reducing the cutting impact in a hydraulically-driven precision blanking press, the force necessary to reduce the cutting impact as a counterforce is generated directly in the pressure chamber of the drive piston such that the counterforce acts directly on the cutting punch and so that the design of the press can be simplified, costs can be reduced, no additional external hydraulic-mechanical means for reducing the cutting impact are needed, and so that the loads on the press and the die can be reduced.

Abstract: Provided is a press forming apparatus for a semi-solid metal material, including: a slide caused to make a reciprocating linear motion; a sub-slide mounted so as to be movable relatively to the slide; a fluid pressure mechanism interposed between the slide and the sub-slide, which is capable of moving the sub-slide relatively to the slide by fluid pressure; an upper die mounted to the sub-slide; and a lower die. The press forming apparatus is configured to press-form the material while applying predetermined pressure to the material for a predetermined period by bringing, along with descent action of the slide, the upper die into contact with the material fed into the lower die, then stopping the slide at a predetermined position, and moving the upper die mounted to the sub-slide relatively to the slide by the fluid pressure mechanism under a state in which the slide is stopped.

Abstract: A hydraulic extrusion press includes at least one ram, the ram being driven by hydraulic oil from a main line and a hydraulic control pressure being used to control the extrusion press. To minimize non-productive periods, the control pressure is also supplied to the main line. The main line and the pressure control system are connected with one another on the pressure side.

Abstract: A device for forming portions of food is proposed, comprising a hydraulic press. rne press has at least one hydraulic pressure generator and at least two actuators, wherein each of the actuators comprises a working cylinder and the working cylinders are hydraulically connected. It is preferably provided that a die has at least two separate receptacles for receiving portions of food. The receptacles interact with respective pressing tools, and the pressing tools can in each case be moved by means of an actuator, in particular by means of a pressing ram.

Abstract: A hand-held pressing apparatus comprises a pressing assembly and a controlling valve. The pressing assembly comprises a piston cylinder, a piston, a piston rod mounted on the piston, and a tool. The piston cylinder defines a piston chamber. The piston is slidably received in the piston chamber. The piston rod is partially protrudes from the piston chamber. The tool is mounted to the protruding end of the piston rod. The controlling valve connects to a pressure source, and is for controlling the gas pressure in the piston chamber. When the pressing head aims at the workpiece, the controlling valve controls the piston chamber to pressurize the pressure cylinder assembly using pressurized gas from the pressure source, to drive the piston, the push rod and the tool to act on the workpiece.

Abstract: The invention relates to bending presses containing pistons providing up and down motion of an upper clamp, two servo motors for motion of the pistons, valves providing pre-filling during quick down and up motion of the pistons wherein upon driving of the four quadrant pumps by the servo motors, the four quadrant pumps rotate in descending direction and the upper clamp is moved downward and the servo motors rotate in reverse direction because of the weight of the upper clamp and the four quadrant pumps generate energy when servo motors are rotating on counter clockwise via kinetic energy that produced by ram weight, gravity and stroke distance of cylinder on press brake.

Abstract: The invention relates to an apparatus for actuating of processing machines like metal forming machines and method, control and application of an apparatus for actuating said metal forming machines. The processing machine is driven by at least two rams with pressurized fluid, like water, whereas the rams are actuated by variable pumps with different fluid under pressure, e.g. hydraulic liquid.

Abstract: A fluid distributor apparatus includes a body having distribution ports; a spool adapted for controlling the distribution ports and mounted slidingly in a first sliding seat obtained in the body and communicating with the distribution ports; a copying-member mounted slidingly and sealed in a second seat obtained in the spool; and a supply system for a controlled supply of the fluid to the second seat, so that the copying-member slides in a controlled way. The supply system includes also a chamber containing the fluid and communicating with said the seat, and a pushing device of the fluid mounted slidingly and sealed in the chamber.

Abstract: A solar-powered waste compactor comprises a waste container for housing waste, a compactor ram actuated by a hydraulic cylinder and piston assembly for compacting the waste in the waste container, and a hydraulic power unit operably associated with the hydraulic cylinder and piston assembly for powering the compactor ram. The hydraulic power unit comprises a motor/pump assembly including a pump unit, a single-phase electric motor driving the pump unit and a flow control valve operating the motor/pump assembly at first or second flow rate depending on an operating pressure. The hydraulic power unit further comprises a battery unit, a solar panel to charge the battery unit, a DC-to-AC inverter, a single-phase AC power inlet connectable to a source of a single-phase electrical power grid, and a reversing contactor providing the electric current only from the inverter or the power inlet at any given time.

Abstract: A pressing device includes a work head having a work head body holding a tool and a mating end. The pressing device includes an actuator having an actuator body holding a hydraulic pump that is operable to drive the tool. The actuator has a mating end. The pressing device includes an interconnect assembly including a hydraulic hose having first and second couplings at both ends of the hydraulic hose for mating with the mating ends of the actuator and the work head, respectively. The interconnect assembly is removable and the work head is configured to be directly coupled to the actuator.

Abstract: The invention relates to a drive device (1) for a bending press, in particular a folding press (2), comprising a press frame (3), a press table (9) and a press beam (11) that can be adjusted relative to the press table (9) via a hydraulic system (18) comprising a hydraulic pump (47), controlled drive motor (45), switch and control means and pressure lines and at least one pressure cylinder (12) which can be supplied with at least one pressure medium. The hydraulic system (18) forms a closed system together with a ring line (44) comprising the hydraulic pump (47), control valves (39, 41, 58, 84, 86, 87, 88, 89) and a pressure store (57). The ring line comprises a first line section (51) between a pressure chamber (23) of the pressure cylinder (12) and the hydraulic pump (47) and a second line section (53) between an additional pressure chamber (22) of the pressure cylinder (12) and the hydraulic pump (47).

Abstract: Bending presses containing pistons providing up and down motion of the upper clamp, at least one engine for motion of the said pistons, and filling valves providing pre-filling during quick down and up motion of the pistons. The bending presses contain at least one pump of variable rotation and fixed displacement transmitting the motion received from the said engine to the pistons.

Abstract: A pneumatic compressor for the compression of waste comprising a cylinder (1) with a piston (2), which via a piston rod (4) activates a compression plate (3), which is slidably mounted in a compression chamber (5) which has a top door (6) through which waste paper is thrown into the compressor, and a bottom door (7) through which a finished bale can be taken out, which compression takes place in a series of compression cycles, which each time is charged with a new portion of waste, until the waste offers a counter pressure corresponding to the pressure which the piston (2) can exert at a pressure of 8 bars. In 80-90% of the compression cycles necessary for the compression of a bale, the piston (2) reaches its bottom position in the cylinder, and each time the pressure reaches a pressure of 8 bars in the cylinder (1).

Abstract: A ram driving method including the steps of fixing one end of a large-diameter piston rod integral with a large-diameter piston reciprocably included in a large-diameter cylinder attached integrally to a ram to a fixing unit, connecting one end of a small-diameter piston rod integral with a small-diameter piston reciprocably included in a small-diameter cylinder integral with the large-diameter cylinder to a moving member moved by a motor driving, integrally moving the small-diameter cylinder and the small-diameter piston and communicating a first compartment and a second compartment of the large-diameter cylinder divided by the large-diameter piston with each other, moving the ram integrally with the small-diameter piston rod moved by the moving member, and communicating the small-diameter cylinder with the large-diameter cylinder, thereby moving the large-diameter cylinder with a strong force by a working fluid supplied from the small-diameter cylinder.

Abstract: The invention relates to a drive device (1) for a bending press, in particular a folding press (2), comprising a press frame (3), a press table (9) and a press beam (11) that can be adjusted relative to the press table (9) via a hydraulic system (18) comprising a hydraulic pump (47), controlled drive motor (45), switch and control means and pressure lines and at least one pressure cylinder (12) which can be supplied with at least one pressure medium. The hydraulic system (18) forms a closed system together with a ring line (44) comprising the hydraulic pump (47), control valves (39, 41, 58, 84, 86, 87, 88, 89) and a pressure store (57). The ring line comprises a first line section (51) between a pressure chamber (23) of the pressure cylinder (12) and the hydraulic pump (47) and a second line section (53) between an additional pressure chamber (22) of the pressure cylinder (12) and the hydraulic pump (47).

Abstract: The invention relates to a hydraulic drive, especially for a press, punching or nibbling machine, comprising a double-acting work cylinder whose piston comprises a first working surface effective in the retracting direction and a second working surface effective in the extending direction, which each delimit one pressure chamber; with at least two different pressures being applicable to at least one of the working surfaces by means of an actuator for retracting or extending the piston into and out of the work cylinder; with the hydraulic drive comprising an actuator unit which optionally enables a throttled return flow of hydraulic medium from the first pressure chamber delimited by the first working surface.

Abstract: A pressing device includes a work head having a work head body holding a tool and a mating end. The pressing device includes an actuator having an actuator body holding a hydraulic pump that is operable to drive the tool. The actuator has a mating end. The pressing device includes an interconnect assembly including a hydraulic hose having first and second couplings at both ends of the hydraulic hose for mating with the mating ends of the actuator and the work head, respectively. The interconnect assembly is removable and the work head is configured to be directly coupled to the actuator.

Abstract: A pump receiver housing of a hydraulically operated pressing apparatus designed in a compact and lightweight manner and that connects a drive unit to a piston cylinder unit and to a press unit. A piston pump assembly is connected to a pump flange pressed directly onto a connection cylinder of the piston-cylinder unit. The connection cylinder projects through a pump lead-through in the housing wall into the pump receiver housing, and directly contacts on the pump piston. Thus, the pump receiver housing is designed without conduits, so that an inside of the pump receiver housing is free of or has no high pressure.

Abstract: A split-trash compacting system for a vessel having a plurality of compartments comprising a trash compacting assembly disposed in a first compartment of the vessel readily accessible to persons on the vessel for receiving and compacting trash. At least one fluid actuator unit is provided for forcing the compacting head downward into a trash bin for compacting trash during a compaction cycle and retracting the compacting head during a retraction cycle. A fluid actuating assembly is disposed in a second compartment of the vessel remote from the trash compacting assembly for supplying pressurized fluid to the trash compacting assembly for actuating the fluid actuator unit. At least one fluid line connecting the fluid actuator in the first compartment and the fluid actuating assembly in the second compartment.

Abstract: A plunger-cylinder assembly for a press including a plunger which is accommodated at least in part in a cylinder while separating the interior of the cylinder into two partial chambers along the cylinder axis. A relieving device which counteracts an increase in pressure of a fluid accommodated in the first partial chamber is disposed in at least one first partial chamber the increase in pressure being caused by a movement of the plunger along the cylinder axis in the direction of the first partial chamber. A hydraulic press encompassing such a plunger-cylinder assembly is also described.

Abstract: Disclosed is a plunger-cylinder assembly for a press, comprising a plunger (5) which is accommodated at least in part in a cylinder (1) while separating the interior (10) of the cylinder into two partial chambers (10.1, 10.2) along the cylinder axis (X). A relieving device which counteracts an increase in pressure of a fluid accommodated in the first partial chamber (10.1) is disposed in at least one first partial chamber (10.1), said increase in pressure being caused by a movement of the plunger (5) along the cylinder axis (X) in the direction of the first partial chamber. Also disclosed is a hydraulic press encompassing such a plunger-cylinder assembly.

Abstract: A slide of a press machine is driven by composite thrust of thrust of an electric (servo) motor SM (via a screw/nut mechanism from the electric motor) and thrust of hydraulic cylinders SYL1, SYL2 to which pressure oil is supplied from a constant, high pressure source. A slide control device controls the electric motor SM and the hydraulic cylinders SYL1, SYL2, based on a slide position signal and a motor angular velocity signal, and at the same time, makes the hydraulic cylinder SYL1 work as a pump during a period when slide load is small, charging pressure oil to the constant, high pressure source by using the thrust transferred from the electric motor to the hydraulic cylinder SYL1 through the screw/nut mechanism and the slide.

Abstract: A safety interlock and retraction mechanism for all types of presses comprising a sensing or activating valve which does not apply full force to a press ram until the ram displaces to the expected work material thickness and a pneumatically operated retraction mechanism which eliminates the need for a return spring. The art differentiates between the thickness of an operator's finger relative to a work material thickness in order to promote safety. The art further provides an increased press ram force by eliminating the return spring force subtracting from the ram force.

Abstract: A double action oil hydraulic press is provided having a main cylinder for actuating a slide and a lower part forming cylinder for actuating a lower part forming unit, wherein the operations of the cylinders are controlled through the combined control of the rotation of an oil hydraulic pump of a power unit and servo valves whereby the amount of operation oil that must be used is reduced.

Abstract: A rod pressure holding instruction section controls a servo motor to rotate a two-way pump in a counter direction, and to supply hydraulic oil, with pressure which does not exceed pressure from a weight of a ram, to a two-way pump-side piping, increasing pressure. A difference between pressure in a rod-side cylinder chamber-side piping of a speed switching valve and pressure in a two-way pump-side piping of the speed switching valve is decreased, thereby decreasing an impact generated when switching the speed switching valve and stopping the ram at a predetermined position.

Abstract: While a workpiece is heated and pressed by one of a pair of high-pressure vessels, a workpiece being pressed by the other high-pressure vessel is placed in a heated state. In the reducing process after termination of heating and pressing treatment of the workpiece by one high-pressure vessel, both the high-pressure vessels are placed in communication, and the pressure medium gas released from one high-pressure vessel is poured into the other high-pressure vessel. After pressures of both the high-pressure vessels have assumed a nearly balanced state, the pressure medium gas is sucked out of one high-pressure vessel by a compressor and pressed, and is poured into the other high-pressure vessel, and the workpiece is heated and pressed by the other high-pressure vessel. By the method as described, considerable shortening of cycle time of HIP treatment is achieved, and the HIP treatment can be carried out with high efficiency.

Abstract: Hydraulic systems are disclosed for operating a press comprising a press ram, a press cylinder including a primary side for activating the press ram and press ram return cylinders for returning the press ram, and at least one flow amplifier comprising a piston including a primary side and a secondary side, the primary side of the piston including a large piston area and a secondary side of the piston having a small piston area, the primary side of the piston being connected to the primary side of the press cylinder and the secondary side of the piston being connected to the press ram return cylinder, at least a portion of the hydraulic system comprising the connection between the primary side of the piston and the primary side of the press cylinder is pressurized.

Abstract: A first given pressure is provided to a first side of an air pressure cylinder that in turn drives a cutting member under the influence of the first given pressure. A second given pressure is provided to a second side of the air pressure cylinder that is greater than the first given pressure during a non-cutting state of the air cylinder. The cutting member remains stationary as long as the second given pressure is greater than the first given pressure. To transition to a cutting state, the second given pressure is rapidly reduced to a value below the first given pressure value during a cutting state of the air pressure cylinder for moving the cutting member to cut a web.

Abstract: An electric motor and hydraulic pump/motor are combined on a torque level, a press machine is controlled with controllability of an electric motor, and kinetic energy of a slide is regenerated during braking without constraints of slide pressurization or an amount of energy. A screw press drives a slide through a screw mechanism made up of a drive nut and a driven screw. The drive nut is provided with a ring gear integral therewith and this ring gear is engaged with a gear provided for a drive axis of an electric motor and a gear provided for the drive axis of a hydraulic pump/motor. The hydraulic pump/motor is connected to a constant high pressure source that generates a quasi-constant pressure hydraulic liquid and a low pressure source. This allows the electric motor and hydraulic pump/motor to be combined on a torque level.

Abstract: A pressing machine with fewer breakdowns in a hydraulic pressure compensating device for a pressure-equalizing apparatus for pressure pins is provided.

Abstract: A press for pressing pulverulent materials, in particular metal powder, having an eccentric crank drive, which has at least one connecting rod and a crankshaft and a gearwheel which is connected thereto in a rotationally fixed manner, for driving an upper punch unit. It is possible to drive the gearwheel via at least one worm drive of at least one motor. An electronic control unit is also provided. In this press, the electronic control unit is designed for reversing operation of the crankshaft.

Abstract: A high precision, all-purpose, double action hydraulic press, which can control the speed, position, and parallelism of each slide, can conduct mold exchanges easily, and prevent the breakthrough phenomenon is provided with an outer slide 4, an inner slide 6, drive cylinders 8 and 9 which drive each of the slides, position detection devices 14 and 15 which detect the position of each of the slides, push pins 13, a damper cylinder 10 which prevents breakthrough phenomenon, and a die plate 5 which is equipped with push pins 13. By controlling the flow in the hydraulic pressure circuit which is connected to each of the drive cylinders, the speed, position, and parallelism of each of the slides are controlled.

Abstract: An oil pressure device is disposed on a hoist frame. The hoist frame has an upper panel and a middle panel. An oil cylinder is disposed on the upper panel. The oil pressure device has a pneumatic pump having a lower cover and a pneumatic cylinder, a base seat disposed on the pneumatic cylinder, the lower cover disposed on a bottom of the pneumatic cylinder, an oil tank disposed on the base seat, and an oil pump connected to the base seat. A handle is connected to the oil pump. A connector is connected to the lower cover. An air pipe is connected to the connector. An air pressure valve is connected to the air pipe.

Abstract: A drive system for the container holder and the travelling beam of a metal extruder press in which a return stroke is accelerated by connecting the annular chambers of the travelling beam and container holder cylinders to a pressurization force and with the full piston area chambers of the container holder connected to a tank, connecting the full piston area chambers of the travelling beam to the pressure source as well.

Abstract: Two hydraulic chambers (3a),(3b) within a slide (2) communicate with an overload protecting valve (12) through relief passages (11a),(11b). Check valves (13a),(13b) and discharge valves (14a),(14b) are arranged in series with each other in the respective relief passages (11a),(11b). When either of the two hydraulic chambers (3a),(3b) has a pressure not less than a set overload pressure, the overload protecting valve (12) opens to relieve pressurized oil within the hydraulic chamber (3a) to an exterior area via a restricting passage (78) of one discharge valve (14a) and the overload protecting valve (12). This switches over the two discharge valves (14a),(14b) to a discharging condition substantially at the same time to communicate the hydraulic chambers (3a),(3b) with a discharge port (R).

Abstract: A press has a fixed platen, a movable platen displaceable toward and away from the fixed platen, a plurality of low-pressure cylinders braced against the movable platen and pressurizable to move it toward the fixed platen, and a plurality of medium-pressure cylinders braced against the movable platen and pressurizable to move it toward the fixed platen. A low-pressure accumulator holding a body of hydraulic fluid and a head of nitrogen and a medium-pressure accumulator holding a body of hydraulic fluid and a head of nitrogen are connected via respective conduits with the low- and medium-pressure cylinders. a nitrogen supply connects the accumulators above the respective fluid bodies together in a closed system. A controller feeds the fluid therefrom to the respective cylinders.

Abstract: A stamping press has a pair of plates defining a press gap between them, a hydraulic ram to produce relative movement between the plates to close the press gap and apply pressure to the die against a substrate in the gap, a hydraulic pump driven by an electric motor through a flywheel means for shutting off the motor on reaching a predetermined pressure in the circuit, and a dump valve for dumping hydraulic pressure from the circuit.