Abstract:
A balanced panel punch drive system. The system includes a main hydraulic drive including an outer casing forming an internal housing and a main piston slidably disposed within the internal housing. A main fluid chamber, a first output chamber and a second output chamber are formed within the internal housing. A pump is fluidly connected to the main fluid chamber by an input line. A first die hydraulic cylinder and a second die hydraulic cylinder each have an outer casing forming an internal housing and a die piston slidably disposed within the internal housing. An opening is formed through an end of the outer casing sized to receive a distal end of the die piston therethrough. A first output line fluidly connects the first output chamber to the first die hydraulic cylinder and a second output line fluidly connects the second output chamber to the second die hydraulic cylinder.
Abstract:
A press including a passive load leveler for bonding integrated circuit wafers, chips or substrates. The press includes a press frame, a press ram moveable relative to the frame, a first platen coupled to the press ram, and a second platen coupled to the press frame. The load leveler is coupled between the press frame and the second platen, and includes a main body having a first surface coupled to the press frame a plurality of pistons extending from the main body through a second surface and being in contact with the second platen. Each of the pistons is positioned within a piston chamber that is in fluid communication with a network of channels within the main body, where the pistons move relative to each other through a working fluid within the channels so as to maintain the first and second platens parallel to each other under the ram pressure.
Abstract:
A method of using data on the force flow in a press for the operation of a plunger, wherein the loads of the parts involved in the force flow can differ as a result of eccentrically operating forces, in such a way that the data about the respectively acting forces that, in accordance with Hooke's law, cause an extension or compression of a movement of the parts involved in the force flow, is measured and evaluated in relation to a drive device and a position of the plunger, whereupon a skewed position of the plunger is permitted or a skewed position of the plunger is counteracted or a skewed position of the plunger is set during operation of the press.
Abstract:
A device is provided for transferring a pattern to an object. The device may be used for transferring a pattern, such as micro- or nanostructures, from a stamp to an object. In accordance with one embodiment, the device comprises a first contacting means with a receiving surface for the stamp and a second contacting means with a receiving surface for the object. The device may further include a pressing means that is adapted to operate at least one of the contacting means for contacting the stamp with the object. One of the contacting means may include a base and a holder. The holder has a first end which defines one of the receiving surfaces and a second opposite end which is pivotally connected to the base in such a manner that the stamp and the object are automatically placed in a parallel position when contacting each other.
Abstract:
A hydraulic press has a press stand; a generally horizontal press plate vertically movably supported in the press stand and arranged for executing forward and return strokes; and a plurality of hydraulic press cylinder units mounted in the press stand above the press plate. Each press cylinder unit has a power cylinder and a plunger slidably received in the power cylinder and extending from the power cylinder to the press plate. There are further provided a plurality of hydrostatic bearings mounted on the press plate; and a chamber defined with each hydrostatic bearing and containing hydraulic fluid. The lower terminus of the plunger projects into the chamber. The hydrostatic bearings constitute a force-transmitting arrangement between the plungers and the press plate and permit a tilting motion of the plungers relative to the press plate. Guide assemblies are mounted at the end of each power cylinder for sealingly and tiltably guiding the plunger.
Abstract:
An electronic control system for operating the hydraulic cylinders associated with a press brake wherein independent control of each of the hydraulic cylinders is achieved to insure that the cylinders track against a fixed reference to insure more accurate forming of the workpiece. The cylinder tracking is under computer control which also establishes a creep speed slower than the normal forming speed near the point of ram reversal. A plurality of press brake may be operated simultaneously from the same tracking reference.
Abstract:
A hydraulic press such as a press brake is disclosed having a pair of long movable and fixed tools which are always kept in parallel with each other by detecting the obliquities of the movable and fixed tools and controlling the fluid delivery to hydraulic motors which drive the movable tool. Each hydraulic motor is controlled by a valve which is actuated by a rocking cam arrangement. The limit of movement of the movable tool toward the fixed tool also can be easily adjusted by adjusting the rocking cam arrangement.
Abstract:
A computer-controlled hydraulic press brake includes an actuator and control system which automatically provides variable pre-programmable ram opening and closing strokes. A microprocessor within the control system responds to stroke parameters entered by the operator and an encoder-generated signal indicative of ram position to generate a velocity command signal defining a velocity profile for positioning the ram to the stroke limits. Closed-loop servo systems associated with each ram cylinder respond to the velocity command signal to cause movement of the ram in accordance with the velocity profile. A ram leveling circuit responsive to individual position sensors associated with respective sides of the ram compensates for ram tilt by simultaneously applying complimentary correction signals to the respective servo systems. A second velocity profile may be generated in response to stored parameters to position a back gauge concurrently with ram movement by means of a second motor drive servo system.
Abstract:
A downstroke baler comprising a compaction chamber through which a platen is reciprocated vertically by spaced pressure actuated cylinders secured to opposite ends of the platen. The lower end of an actuating rod rests upon a support plate secured to the frame of the baler and a bracket secured to the frame of the baler is positioned adjacent the upper end of the actuating rod to restrain the actuating rod against vertical movement. A sleeve is secured to the platen and slides along the actuating rod such that the actuating rod is maintained perpendicular to the face of the platen. The upper end of the actuating rod is connected through an actuating link to valves secured to the frame of the baler. The valves control a hydraulic circuit connected to the cylinders which raise and lower the platen such that movement of the platen from a horizontal attitude causes the actuating rod to be moved from a vertical attitude thereby changing flow of fluid to the cylinders to return the platen to a horizontal attitude. The rod ends of the cylinders are in continuous communication with the source of pressurized fluid. A valve between the source of pressurized fluid and base ends of the cylinders is shiftable to a first position to direct pressurized fluid to the base ends of the cylinders to elevate the platen and is shiftable to a second position venting base ends of the cylinders to move the platen downwardly.
Abstract:
A cutting machine having a beam and table with a platen supported on a ram on the beam for movement transversely of and toward the table is provided with means for distortionlessly limiting movement of the platen relative to the ram and the ram relative to the beam. Distortion due to tilting out of parallelism between the platen and the table is avoided. Preferably the limiting means are, respectively, impulse emitters between the platen and ram, and means for engaging a slide support for the ram with the beam while the beam is in fixed orientation relative to the table.