Abstract: A hot metal gas forming and quenching system and process thereof are provided. The system includes a hydraulic press, a die assembly, a rapid heating module, and a rapid cooling module. The die assembly includes a progressive die realizing the hot gas bulging and rapid cooling of the workpiece. Through the above system and the process, making pipes with uncoated plates has a lower cost than with coated and plated steel plates, with fewer structural defects and process risks. By using a progressive die, a resistance heating process and hot gas bulging and quenching processes are performed in parallel, and the material is loaded progressively, thereby having a fast pace and a greatly improved efficiency. A heating state of parts is fully protected, oxidation is avoided, and no coating is required. After the workpiece is formed, it can be directly welded to a car body without shot blasting.

Abstract: A machine for cooling and truing cast components made from cast material, and includes a construction for holding cast components and a holder to supply cooling liquids. A method to treat a cast component after removal of the cast component from the casting mould, the cast component being loaded immediately with a cooling liquid in a water spray.

Abstract: In the case of speed-regulated high-power drives and with simultaneously high demands on accuracy or dynamics, the object of the invention is to reduce a very high level of complexity of the power electronics (high clock frequency), the motor (high precision) and mechanical transmission (low-play transmission elements). For this purpose, the invention proposes a drive device for rotational and/or t translational movements. The drive has a plurality of drives for the joint, mechanically coupled driving of a working machine or for moving a mass. It also has a control device. At least one drive is intended to provide the power (as a power drive). At least one further drive is provided and mechanically coupled as a servo-drive for controlling or regulating the accuracy and/or dynamics of the overall drive. The control device controls and regulates the at least two mechanically coupled drives.

Abstract: An electro-hydraulic pressing device, which is particularly suitable for producing pipe joints by means of press fittings, has a pressure piston, which acts on pressing jaws. The pressure piston divides a pressure piston chamber into a pressure chamber and a rear chamber. A hydraulic pump for feeding hydraulic fluid from a reservoir is connected to the pressure chamber. A balance piston is arranged in the piston in addition to an overpressure valve. Up until a switch-off pressure is reached, i.e. throughout the pressing process, the balance piston closes a connection opening and a return flow channel.

Abstract: A triangular hemming and stamping apparatus includes a stationary base that mounts a lower die set. Three guide posts are triangularly positioned on the base and extend generally vertically from the base. An upper fixed superstructure is supported by the three guide posts and fixedly spaced from the base. An upper slidable structural member that mounts an upper die set is slidably mounted on the guide posts between the base and the superstructure. An actuator is mounted on the superstructure and connected to the upper slidable structural member within an area within the guide posts. The actuator is not connected to nor associated with the guide posts, and the actuator is operable to move the upper slidable structural member toward and away from the base to perform hemming and stamping on a workpiece.

Abstract: A flaring device for flaring a hollow malleable tubular member is provided. A hydraulically powered assembly includes a main body having a cylinder, a lever and a piston member which is received in the cylinder. The main body has an axis and opposing first end and second end. The lever is pivoted on the first end of the main body and operable to drive the piston member to move along the axis. One end of the piston member is formed with a conical expander. The die set is disposed at the second end of the main body and has a plurality of die elements arranged around the axis. The conical expander of the piston member is actuated to move axially and outwardly so as to radially drive the die elements to flare the hollow malleable tubular member.

Abstract: There is provided a press machine which can apply a large compression force to a mold as well as impart smooth vibration only in a rectilinear advancing direction to the mold, and thereby can improve the press-formability. A main slide and a sub-slide constitute a slide and at the same time a cylinder-piston mechanism. During press-forming, a compression force is transmitted to the sub-slide (an upper mold) through hydraulic pressure applied interlockingly with driving of the main slide, and the sub-slide is vibrated with the hydraulic pressure being periodically changed. Favorable press-forming can be performed even under relatively difficult press-forming conditions, by controlling the vibration such that a vibration frequency of the sub-slide (the upper mold) becomes 9 Hz or higher but 33.3 Hz or lower and a vibration amplitude of the sub-slide becomes 0.05 mm or larger but 0.5 mm or smaller.

Abstract: A method of using a hydraulically driven pressing device for pressing a fitting on a tube is provided. The pressing device includes a piston and a cylinder for acting on pressing jaws. A piston shaft is connected to rollers. The pressing device can be used to carry out pressing operations requiring different levels of pressing power, by using an adjustable stop which is provided in the direction of displacement of the piston in order to achieve different end positions for the piston during the piston return stroke.

Abstract: The present invention provides an extrusion press which eliminates unevenness of dynamic and thermal fatigue degrees of the hydraulic devices which form the hydraulic circuit in the extrusion press, the electric Motors which drive the hydraulic pump, the control devices, etc., which makes the dynamic and thermal fatigue degrees and remaining service lives of the component devices even, and which is excellent in energy saving effect. An extrusion press which has a plurality of variable capacity type hydraulic pumps connected to it in parallel for supplying working oil to hydraulic cylinders of the extrusion press, uses a preset working speed as the basis to find the required discharge rate of the hydraulic pumps, and selectively controls the drive operations of the hydraulic pumps, wherein the order of selection of the hydraulic pumps which are selectively controlled in drive operation is controlled by a program which progressively advances when a predetermined number of molding cycles are completed.

Abstract: An oil-pressure swaging tool for rebuilding a connecting pipe includes an abutting member abutting against an oil-pressure device, a connector inserted into a connecting pipe, one end of a first axial member passing through the abutting member to connect to one end of the connector, another end of the first axial member connected to the oil-pressure device, a rebuilding member assembled to another end of the connecting pipe, a pressure collar adjacent to one end of the rebuilding member, one end of a second axial member passing through the rebuilding member to connected to the pressure collar, another end of the second axial member connected to another end of the connector. Therefore, when the opening of the connecting pipe is rebuilt by the oil-pressure swaging tool of the present invention, one end of the connecting pipe is not necessary to abut against a wall because of the abutting member.

Abstract: Systems and methods for providing tube end forming equipment or machines that utilize the advantage of hydraulic power without having the constant noise, heat, and energy usage associated with traditional hydraulic power units. The end forming machine includes a hydraulic pump that is operated only when a demand from the system for oil pressure/flow is present. This is accomplished by providing a synchronous servo motor and servo drive coupled to a fixed displacement hydraulic pump. The oil pressure of the system is monitored to detect when the pressure drops below a preset value to provide closed-loop control of the servo motor. The servo motor is controlled to rotate the hydraulic pump at the required speed (up to the maximum RPM of the motor/pump combination) as necessary to obtain the desired system pressure during the tube end forming process.

Abstract: A crimping tool for crimping an electrical contact toward engagement with an electrical conductor, including a housing, a pair of crimping dies, a die support arrangement supporting a first one of the crimping dies in a stationary position on said housing, and a displacing mechanism for displacing the other crimping die between open and closed positions relative to the stationary crimping die. The displacing mechanism includes a rotary drive shaft, a crimping arm having a first end portion connected with the movable crimping die member, and a rotary-to-reciprocatory motion converting mechanism adjacent the other end of the crimping arm for transforming the rotary motion of the drive shaft to a reciprocatory motion of the crimping arm, thereby to displace the movable crimping die between the open and closed positions.

Abstract: A hand/pneumatics dual operation vacuum pulling device includes an elongate shank and a slidable backward ram fit to the shank. The shank has an end to which a suction cup is attached. The shank has an upper end to which a handgrip having a pressure relief seat is mounted. A ramp stop section is formed below the pressure relief seat. The handgrip can selectively and switchably couple with a hand-operating pump piston to form a hand-operating vacuum pulling device, or couple with a pneumatic operation seat to form a pneumatically-operating vacuum pulling device. For hand operation or pneumatics operation, the vacuum pulling device is allowed to easily switch between the two modes according to the availability of power supply and the site of use, thereby achieving an excellent device for one device having two ways of use.

Abstract: A connector installation apparatus including a frame, a ram and a gas spring. The frame includes an anvil section. The anvil section is adapted to have a first connector part located at the anvil section. The ram is movably connected to the frame. The ram includes a front section adapted to have a second connector part located at the front section. The gas spring includes a piston head on a rear end of the ram, and a portion of the frame forming two variable chambers with the piston head.

Abstract: A rod manipulator including power-base and various assemblies, interchangeably attaching to the base. The power-base is composed of a pneumatic cylinder and piston which affects the function of various assemblies. The piston moves the central component of an assembly toward the fixed portion of that assembly. A bending assembly containing mobile pivots around which a surgical metal rod can be bent. A cutting assembly containing blades in central and fixed portions between which a surgical metal rod can be cut. The distal end of the cut rod is retained by replaceable, sterilizable, eject-grips during and immediately after the cutting operation. The general object of the invention is to provide an improved surgical rod cutter and surgical rod bender, capable of performing both tasks with one power source, requires one-person operation, eliminates the need for significant muscular forces and eliminates the opportunity for an unsafe projectile in the operating room.

Abstract: A hog ring fastening device is disclosed. The hog ring fastening device includes a body, a magazine attached to the body, jaws pivotally supported on the body, a main pneumatic cylinder for turning the jaws, a teed pneumatic cylinder fixed to the body and adapted to be retracted when the jaws are turned away from each other, a moving plate attached to a piston rod of the feed pneumatic cylinder, a push spring for pushing the moving plate in a feed direction with respect to a body of the feed pneumatic cylinder, a feed member provided at the moving plate, and a stopper attached to the body of the hog ring fastening device for preventing a hog ring assembly loaded on the magazine from moving in a direction opposite to the feed direction.

Abstract: A swage tool for swaging axially swaged fittings includes a housing having an inner surface and a first yoke. A ram includes a recessed portion having a threaded inner surface portion. A piston includes a second yoke. A piston rod includes a spring holder and a threaded portion screwed into the threaded inner surface portion of the ram. A spring is connected to the spring holder. Carbon fiber bearings are provided on the ram and on an outer surface portion of the piston rod in axial slidable engagement with the inner surface of the housing.

Abstract: The invention relates to a novel design of hydraulic processing pincers for processing workpieces, with a tool which, in a first tool part, has an axially displaceable tool plunger which, with a first end or with a tool provided there and an opposite work rest, forms a working region or a working gap and can be moved with the first end towards and away from the work rest, and made up of a hydraulic actuating device for applying a force to the tool plunger via a movable pressure-transmitting element, said force moving said tool plunger in the direction of the work rest. The piston and/or the piston rod are/is designed with a cavity in which the tool plunger is accommodated in its initial position at least over part of its length.

Abstract: A cooling device (70) for cooling a work piece (9) that has reached a high temperature due to the implementation of a closing operation in which a bottom portion (9c) is formed by closing an end portion of the tubular work piece (9) comprises a tilting mechanism (151) which tilts the work piece (9) such that the bottom portion (9c) faces downwards and a cooling water tank (155) storing cooling water. The bottom portion (9c) of the work piece (9) tilted by the tilting mechanism (151) is submerged in cooling water stored in the cooling water tank (155).

Abstract: A hem is formed in two abutting surfaces of a work piece in a two-pass process in which the work piece is pre-hemmed by a reciprocating tool in a first pass and in which the hem is then formed from the pre-hem by the same reciprocating tool in a second pass upon inversion of the work piece. In especially preferred aspects, the reciprocating tool has an angled contact surface that cooperates with a corresponding static tool.

Abstract: This invention is a hydraulic operated pipe pincher. It comprises a head segment having two hydraulic jacks linked with said head section, a sliding die head housing with said jacks connected to said sliding die head and a foot segment having a die linked with said foot segment. A boat is located on the surface of the water above where the pipe is to be pinched is located. The pipe pincher would be lowered and positioned around the pipe by way of a manipulator arm on a deep water submarine. The sliding die head would then be forced down against the pipe to pinch the pipe closed to restrict or nearly stop the flow of oil within the pipe. The dies are shaped to compress the pipe from each side equally.

Abstract: An extrusion press for making profiles of nonferrous metal has a ram, a hydraulic piston/cylinder assembly for moving the ram, a pump connected to the assembly for pressurizing same, and an electric motor connected to the pump for driving same. A multiphase source of electricity is connected via a controller to the electric motor for a soft start of the motor.

Abstract: Solutions for robotic fastener peening in turbine machines are disclosed. In one embodiment, an apparatus includes: a peening machine having a peening head; a robotic apparatus including: a robotic arm coupled to the peening machine; and a base member coupled to the robotic arm, the base member mounted independently of the machine element; a vision system for locating a fastener on the machine element; and a control system coupled to the vision system, the peening machine and the robotic apparatus, the control system configured to control movement of the robotic apparatus and the peening machine based upon vision system data and spatial information about the fastener and the machine element.

Abstract: An improved method and apparatus are provided for constructing and operating a linear actuator, and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement between the driving member and the driven member of a mechanical linear actuator for applying a unidirectional biasing force between the driving and driven members, along an axis of motion, regardless of the location or movement of the driving and driven elements with respect to one another along the axis of motion. The pneumatic biasing arrangement is also configured, connected and operated to reduce the force which must be exerted by the driving and driven members in extending and retracting the linear actuator. The pneumatic biasing arrangement may further be configured for preferentially aiding extension or retraction of the actuator.

Abstract: A hydraulic compression tool for securing a compression type cable connector to a prepared end of a coaxial cable. The tool can include a hydraulic assembly having an axially extendable ram, and a connector frame detachably attached to the hydraulic assembly. The connector frame can include a cable cradle configured to accommodate cables of various sizes and a sleeve for engaging a cable connector. The connector frame can further include a sliding guide structure attached to the cable cradle. The sliding guide structure can include a sliding bar and one or more sliding guides. The sleeve can be attached to the sliding bar. The sleeve can be configured to accommodate connectors of various sizes. Activating the hydraulic assembly can cause the ram to extend, which in turn can cause the sliding bar to move along the longitudinal axis of the cable connector compressing the compression member and connector body into operative engagement with the cable.

Abstract: A hydraulic pressing unit includes a hydraulic pump, supply and hydraulic chambers, moving and stationary parts, a restoring spring, and a return valve provided within or attached to a housing. The moving part is displaced from a starting position into a pressing position as a result of filling the hydraulic chamber with a hydraulic medium from the supply chamber by using the hydraulic pump. The return valve is automatically displaced into an open position as a result of a hydraulic pressure corresponding to the pressing position, and the restoring spring moves the moving part. A piston acts on the flow of the hydraulic medium and lowers the pressure such that the return valve is displaced into the closed position.

Abstract: A closing device 100 which presses a die 2 against a rotating pipe body 1 such that an open end portion of the pipe body 1 is plastically closed by the die 2 includes a cored bar 3 inserted into the pipe body 1 to close the open end portion of the pipe body 1 on the opposite side of the die 2, and a reactive force applying mechanism 43, 60 which allows the cored bar 3 to retreat and applies a reactive force to the retreating cored bar 3 when the cored bar 3 receives a predetermined load or more during processing of the pipe body 1 by the die 2.

Abstract: The invention relates to a hydraulically driven pressing device (1) comprising a piston (5) and a cylinder (4) for acting on pressing jaws (8, 8?, 8?), wherein the piston shaft (11) at any rate is connected to acting means (12). To further improve a pressing device of the type in question such that the same device can be used to carry out pressing operations requiring different levels of pressing power, it is proposed that an adjustable stop (33) be provided in the direction of displacement of the hydraulic piston (5) in order to achieve different end positions for the hydraulic piston (5) during the piston return stroke. A method of pressing a fitting with a tube is also described.

Abstract: Bending machine, in particular a folding press (1), comprising a machine frame (2), a press table (3) supporting a lower die (5) and connected to the machine frame (2), a press beam (7) supporting an upper die (8) and adjustable along a guide (11) on the machine frame (2) in the direction (12) of the press table (3) as well as at least one adjusting member (13) for adjusting the press beam (7) in the direction (12) of the press table (3) with two relatively adjustable adjusting elements (15, 17), wherein a first adjusting element (15) of the adjusting member (13) is drive-connected by means of a first connecting element (24) to the adjustable press beam (7). In this case a second adjusting element (17) of the adjusting member (13) is drive-connected by means of a second connecting element (25) in or below a horizontal reference plane (27) running through a press table bearing surface (4) to the machine frame (2) or the press table (3).

Abstract: A system and method are described for ballizing and measuring a workpiece bore hole. In one embodiment, a ballizing unit having a distal end removably coupled to a ballizing member moves the ballizing member from a first position within the bore hole to a second position. A metrology unit having a distal end removably coupled to the ballizing member moves the ballizing member from the second position back to the first position. A sensor detects a force exerted on the ballizing member by the workpiece at a third position, which is located between the first and second positions.

Abstract: An adjusting cylinder for long, rapid lifting movements in rolling stands, including vertical edging stands, wherein each adjusting cylinder has at least one piston which acts through the bearing chocks of at least one work roll or of an interposed roll to adjust a work roll on both sides, wherein each adjusting cylinder has a piston that is equipped with two oppositely directed piston rods, and each piston is inserted in a recess in the cylinder base or cylinder cover, such that the base and cover have coaxially arranged bores through which the piston rods pass. The surface formed by the piston and the piston rod is smaller than the surface formed by the piston and the piston rod.

Abstract: A die separator cylinder for use in separating first and second portions of a metal forming die set comprises a housing including a bore. A piston is adapted to reciprocate in the bore between an extended position and a depressed position. The die separator cylinder further includes gas flow paths leading to and from the bore that define asymmetrical gas flow rates relative to each other so that said when the bore is charged with an inert gas, the inert gas biases the piston to the extended position with a force that varies depending upon a time interval elapsed since the piston moved from the depressed position to the extended position.

Abstract: Tools for expanding (i.e., flaring and swedging) the ends of metal tubes are configured for attachment to a powered impact hammer, such as an air hammer. A swedging tool for swedging an end of a metal tube has a swedging body with a die section for expanding the tube when driven thereinto and a flanged shank attached to the swedging body and configured for engagement by a powered impact hammer. A flaring tool for flaring an end of a metal tube includes a flaring body having a die section for flaring the tube when driven thereinto. A flanged shank is attached to the flaring body and configured for engagement by a powered impact hammer. A method for expanding an end of a metal tube entails attaching a die body for expanding the end of the metal tube to a powered impact hammer, aligning the die body with the inner diameter of the metal tube, activating the powered impact hammer, and urging the die body a determined distance into the metal tube.

Abstract: A tool head assembly for a pressing device includes a tool head frame having a first die and a moving ram having a second die operatively coupled to the moving ram. The moving ram is movable along a gripping stroke between an open position and a closed position. The second die is configured to hold a work piece between the second die and the first die when the moving ram is in the closed position. The tool head assembly also includes a latch mechanism, wherein the latch; mechanism is actuated to release the moving ram from the open position to the closed position to thereby hold the work piece within the tool head assembly.

Abstract: A system and method are described for ballizing and measuring a workpiece bore hole. In one embodiment, a ballizing unit having a distal end removably coupled to a ballizing member moves the ballizing member from a first position within the bore hole to a second position. A metrology unit having a distal end removably coupled to the ballizing member moves the ballizing member from the second position back to the first position. A sensor detects a force exerted on the ballizing member by the workpiece at a third position, which is located between the first and second positions.

Abstract: Disclosed herein is a crimp die holder. The crimp die holder includes a main body portion, a pin, and a spring. The main body portion includes a first recess, a second recess, and an opening. The first recess extends from a first side of the main body portion to a middle section of the main body portion. The second recess extends from a second side of the main body portion to the middle section. The opening extends from a third side of the main body portion and through a section of the second recess. The pin is disposed within the opening. The pin includes a first portion along a length of the pin. The first portion of the pin is configured to engage with a portion of a crimp die at the section of the second recess. The spring is between the main body portion and the pin.

Abstract: A hydraulic compression tool for securing a compression type cable connector to a prepared end of a coaxial cable. The tool can include a hydraulic assembly having an axially extendable ram, and a connector frame detachably attached to the hydraulic assembly. The connector frame can include a cable cradle configured to accommodate cables of various sizes and a sleeve for engaging a cable connector. The connector frame can further include a sliding guide structure attached to the cable cradle. The sliding guide structure can include a sliding bar and one or more sliding guides. The sleeve can be attached to the sliding bar. The sleeve can be configured to accommodate connectors of various sizes. Activating the hydraulic assembly can cause the ram to extend, which in turn can cause the sliding bar to move along the longitudinal axis of the cable connector compressing the compression member and connector body into operative engagement with the cable.

Abstract: A jaw assembly including a first jaw, a second jaw, and a pivot pin. The first jaw has two spaced first ears having pivot pin holes through the first ears. The second jaw has two spaced second ears having a pivot pin holes through the second ears. The pivot pin is located in the pivot pin holes to pivotably mount the first and second jaws to each other. The pivot sections include a guide surface configured to guide alignment of the ears relative to each other to thereby align the pivot pin holes with each other. The jaws each include a rear end with a roller contact surface configured to be moved apart by rollers of a roller assembly of a tool. The rear ends each include a concave surface configured to locate one of the rollers therein.

Abstract: Provided is a die cushion controller (40) that controls an ascending/descending speed of a die cushion pad (15) based on a preset pressure pattern (56) and positional pattern (54), in which a position/pressure control switching unit (51) constantly monitors and compares a for-pressure speed command signal ?pc corresponding to a pressure deviation signal ep and a for-position speed command signal ?hc corresponding to a position deviation signal eh, and selects smaller one of those speed command signals to be sent to a speed control unit (53). Since the for-pressure speed command signal ?pc and the for-position speed command signal ?hc are constantly monitored and either one of them is selected, change in pressure and change in position can be accurately recognized to allow switching between a pressure control and a position control quickly, stably, and reliably.

Abstract: A hydraulic tool including a main unit and an arm support. The main unit includes a working head section connected to a hydraulic drive section, and a handle section adapted to allow a user to hold and operate the main unit with a single hand of an arm of the user. The arm support extends rearward from the main unit. The arm support is adapted to rest against the arm of the user proximate the user's upper forearm to partially support the hydraulic tool on the arm of the user.

Abstract: A pneumatic dent removing tool, wherein a sleeve is sheathed onto a vacuum ejector, and the inner screw thread of the sleeve is screwed to the outer screw thread of the vacuum ejector such that the combination of the free space of the vacuum ejector and the sleeve are sealed together. An air tube fitting opening is connected with an air tube which contains a suction cup. A jet faucet fitting opening connects with a jet faucet, and the jet faucet is connected with an air supply hose. The user need only eject the high pressure air into the vacuum ejector to generate suction under the suction cup. This process achieves the function of saving time and effort, increasing user safety, and decreasing the negative impact on the strength of the sheet metal.

Abstract: A press cylinder for an extrusion press having a cylinder beam has a cylinder housing fixed on the beam and a piston shiftable along an axis in opposite forward and rearward directions in the housing and defining with a rear end of the housing a pressurizable cylinder chamber. A rod projecting axially rearwardly through the rear wall of the housing is formed with an axially extending bore. A connection block is fixed on the housing rearward of the piston. An axially extending tube in the bore fixed to the block is surrounded by an axially extending sleeve forming with the tube an annular gap, forming with an inner surface of the bore an annular compartment, and also fixed to the block. This is formed with respective passages opening into the tube and into the annular gap.

Abstract: A hog ring fastening device includes a body member, a main pneumatic cylinder attached to the body member, a first swing member supported for turning on the body member, a push means supported on the first swing member, a feed pneumatic cylinder fixed to the first swing member and connected to a port of the main pneumatic cylinder, a second swing member supported for turning on the body member so as to be in contact with the free end of the piston rod included in the feed pneumatic cylinder, a feed means supported on the second swing member, a spring seat fixed to the body member, a compression spring extended between the spring seat and the first swing member, and an extension spring extended between the first and the second swing member.

Abstract: There is provided a new and improved apparatus and method for rolling workpieces such as crankshafts. The apparatus has first and second rolling heads mounted at spaced positions along a common rolling arm to receive a crankshaft bearing therebetween which can then be shifted relative to one another along the common rolling arm to close the heads or rolling tools for clamping onto the workpiece. The in-line clamping action and force provided by the tools on the rolling arm are created by actuation of a tall, thin cylinder assembly including a number of aligned individual cylinders sized to keep the width of the cylinder assembly to a minimum so that all of the rolling arms can likewise be of a thin construction pivotally mounted on one side of the crankshaft and axially spaced according to the crankshaft bearing spacing for rolling all of the bearings in a single rolling operation.

Abstract: A compression tool including a ram; a drive system, a battery and a user selectable retraction control. The drive system is connected to the ram to extend the ram and allow retraction of the ram. The battery is connected to the drive system to at least partially power the drive system. The user selectable retraction control is connected to the drive system. The user selectable retraction control includes a plurality of ram retraction settings which are adapted to be selected by a user to at least partially control respective different retraction stopping locations of the ram.

Abstract: A multi-purpose hydraulic tool of the open center and closed center type is provided with an OC/CC knob mounted on the trigger activated spool. The spool has a knob which can be turned to easily move between OC and CC operating conditions, without the use of additional tools. A check spool assembly works in conjunction with spool assembly in the open-center condition to provide for release of oil at the end of the return stroke. Adapters are provided so that crimping heads can be easily interchanged.

Abstract: A hydraulic circuit for linearly driving a machine-tool slider in both directions, comprising an hydraulic cylinder (5) whose piston rod (4) is connected to a slider and which is fed with pressurized fluid from a reservoir (14) by a pump (15) through a three-position four-way valve (18), a check valve (12-13), and between the last ones, a pair of throttling valves (19, 19?) which are mounted symmetrically each other and operated to generate an increased pressure in either one or the other chamber, which is at the moment in a low pressure, of the hydraulic cylinder (5) in order to slow down said slider in its work motion in both directions of linear travelling when a programmable interval is approached from a predetermined position for each working pass. Situated in the bypass (190, 190?) of each throttling valve (19, 19?), among the same valves (19, 19?) and the hydraulic cylinder (5), is a manual flow control valve (20, 20?).

Abstract: A hydrotapping power unit is disclosed that is operable to hold a hydrotapping tool in a home position adjacent a part while the latter is being hydroformed in a die cavity, to then advance the tool to pierce a hole in the hydroformed part while the part remains in the die cavity and under pressure and then continue to advance the tool to inwardly extrude the part about the hole, to then further advance while also rotating the tool at a feed rate equal to the thread pitch of the tool to thereby form a thread in the pierced hole, and finally retract while also rotating the tool but in the reverse direction and at the same feed rate to release the tool from the threaded hole.

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: A controller for a press brake controls a servomotor to reverse the rotation of a bidirectional piston pump so as to reverse the vertical movement of a hydraulic cylinder and a ram. A command generator maintains a constant speed for a predetermined warmup time or distance after the ram movement is reversed, and afterwards changes the ram speed to a predetermined speed. A ram position, set according to a moving speed pattern, is compared to the actual position of the ram to conform the ram to the moving speed pattern. The moving speed may be limited based on at least one of a pressure and a detected by a pressure sensor.