EP4043197B1 - Verfahren und system zur steuerung eines aktuators eines stössels einer presse - Google Patents

Verfahren und system zur steuerung eines aktuators eines stössels einer presse Download PDF

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Publication number
EP4043197B1
EP4043197B1 EP22156619.3A EP22156619A EP4043197B1 EP 4043197 B1 EP4043197 B1 EP 4043197B1 EP 22156619 A EP22156619 A EP 22156619A EP 4043197 B1 EP4043197 B1 EP 4043197B1
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EP
European Patent Office
Prior art keywords
cylinder actuator
accumulator
chamber
active
ram
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22156619.3A
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English (en)
French (fr)
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EP4043197A1 (de
Inventor
Luciano Zanolini
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Voith Turbo Srl
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Voith Turbo Srl
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Publication of EP4043197A1 publication Critical patent/EP4043197A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/022—Systems essentially incorporating special features for controlling the speed or actuating force of an output member in which a rapid approach stroke is followed by a slower, high-force working stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20569—Type of pump capable of working as pump and motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31529—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having a single pressure source and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
    • F15B2211/31558—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line having a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure control
    • F15B2211/5753—Pilot pressure control for closing a valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means

Definitions

  • the invention relates to a method and a system for controlling an actuator of a ram of a press, used for working pieces to be worked, to make the working cycle and the structure of the press more economical.
  • a known hydraulic circuit installed on a press to actuate its ram comprises a series of components that allow the ram, in order to perform workings of pieces such as punching or folding, to carry out a quick stroke of approach to the piece, followed by a slower extra-stroke to perform working, and a final return stroke in the rest position raised by the piece.
  • presses are divided in two types, namely presses that have a ram having a considerable self-weight, which affects its general operation, and presses that have rams with a self-weight that is considered light and which scarcely affect the general operation.
  • an asynchronous motor which actuates a constant-flow pump, which, in turn, feeds an accumulator acting as a tank of the pumped oil.
  • a servo-valve is arranged that, in turn, is hydraulically connected with the push chamber of the cylinder the piston of which actuates the ram.
  • the movement of the piston in this case, is controlled by the servo-valve.
  • an asynchronous motor that, however, in this case functions with a fixed number of revolutions and is connected with a variable-flow pump, which, in turn, feeds the push chamber of the cylinder the piston of which actuates the ram.
  • the movement of the piston of the cylinder is controlled by the servo-valve mounted on the pump that controls the flow-rate and the working pressure.
  • the pumps used either of the type with internal gears or of the type with axial pistons, are in both cases usually of the four-quadrant type.
  • pumps In all cases cited, to reverse the direction of motion of the ram and to perform the workings requested, pumps must be able to reverse their direction of rotation as quickly as possible, typically in some milliseconds, to allow the performance of the working cycles of the pieces.
  • the aim of the patent application is to lower energy for operating the press for shaping workpieces and a method thereof.
  • Each cycle has at least one phase in which the storage pressure in the accumulator presses the hydraulic fluid into a chamber of a hydraulic cylinder in order to move a ram relative to the cylinder, the ram being couple to the cylinder.
  • a hydraulic pump driven by a motor delivers hydraulic fluid to the accumulator at a charging volume flow rate.
  • the storage pressure is adjusted to a reference value by setting the speed of the motor to a nominal motor speed n N and to at least one intermediate value n z , where 0 ⁇ n z ⁇ n N .
  • a drawback consists in the fact that pumps of the four-quadrant type, which are renownedly expensive and have a limited efficiency, are generally mounted in these hydraulic circuits, which, therefore, makes also the manufacturing and the maintenance of the presses that use them proportionally expensive.
  • a further drawback consists in the fact that with the use of known presses it is very difficult to establish some special working parameters exactly, such as, for instance, the verification and the possible successive correction of the folding angle of a piece during its working, i.e. it is very difficult to move the ram at a low speed with centesimal displacements in both directions.
  • An object of the invention is to improve the known state of the art.
  • Another object of the invention is to provide a method and a system for controlling an actuator of a ram of a press that allows to reduce general manufacturing costs.
  • a further object of the invention is to achieve a method and a system for controlling an actuator of a ram of a press that has a structure that is simplified and, consequently, economical as compared to the state of the art.
  • a load condition of the accumulator 105 is noticed, in which the pump 102 is actuated by the motor 101 and rotates in an active rotation in the direction indicated by the arrow "DX".
  • the oil under pressure reaches also the chamber 113 on the rod side of the cylinder 115, which, however, remains stationary, since the shut-off valve 116 is positioned in the closed condition 116I, preventing drainage of oil from the chamber 114 on the head side of the cylinder 115.
  • the press punch is raised in relation to the die and an operator can position a piece to be worked under the ram, between the punch and the die, or can carry out other maintenance operations.
  • a condition is observed that can be alternatively of quick descent of the ram, or a working condition, or a condition of so-called maintenance, this latter being a condition in which the ram remains stationary in a position of work completed and waits, for instance, for the yield of the material with which a piece is manufactured during the working phase, or for the cooling down of a piece just manufactured.
  • shut-off valve 116 is switched to the open position 116A, connecting the pump 102 that rotates in an active rotation "DX”, actuated by the motor 101, delivering oil under pressure to the chamber 114 following the arrows F2.
  • the self-weight of the ram is substantially uninfluential with respect to the movement of descent of the cylinder 115, which is moved, therefore, by the push of oil under pressure that reaches the chamber 114 on the push side of the cylinder 115 through the line (x): the movement of the cylinder 115 is opposed in the phase of descent by the pressure of the oil that is present in the chamber 113 on the rod side and that in this condition flows out towards the accumulator 105 along the hydraulic line (o), according to the direction of the arrow F4.
  • the descent of the actuating cylinder 115 is controlled by a known signaling system of its position and, when it reaches the lower limit position that corresponds to the final working position of a piece to be worked, the condition of maintenance mentioned before is activated, in which the actuating cylinder 115 is kept stationary until the material in which the piece to be worked is manufactured has stabilized or cooled down: this is the case, for instance, of a folding work of a sheet metal piece that, after the active phase of proper folding, requires a waiting phase, to allow the folded sheet metal to stabilize its own condition of internal stress caused by folding, or to cool the formed piece, for instance in case of forming pieces manufactured in glass.
  • shut-off valve 116 is kept in the open configuration 116A connecting, through the hydraulic line (#), the chamber 114 with the reservoir 103, through the pump 102.
  • the counter-rotation "SX" is contrary to the active rotation “DX” and the counter-rotation speed is controlled by the motor 101 that, in practice, acts as a brake for the rotation of the pump 102 that becomes a control element of the outflow of oil through the hydraulic line (#) and, consequently, of the speed of reascent of the cylinder 115 toward the UDC.
  • the accumulator 105 feeds oil under pressure into the chamber 113 on the rod side through the line (o) according to the arrow F5, providing the necessary push for the return of the cylinder 115, and the unidirectional valve 107 prevents oil under pressure that flows out from the accumulator 105 from flowing directly towards the reservoir 103, i.e. by-passing the cylinder 115.
  • the pressure reducer 108 allows both to change the pressure inside the accumulator 105 and to discharge a small quantity of oil through its drainage duct.
  • This pressure increase causes a drainage of small quantities of oil from the pressure reducer 108 (of the order of 2-4 liters per minute, considering that the drainage activates in the cycle, only in the phase of descent of the cylinder) that is restored when the cylinder 115 carries out a reascent stroke.
  • pressure inside the accumulator 105 decreases down to a value lower than the one determined by the pressure reducer 108, and the oil present in the inside is constantly refilled by a supply of additional fresh oil.
  • the action of the accumulator 105 besides improving the positioning accuracy of the ram/rammer, allows to control the displacement speeds thereof and with the counter-rotation of the brushless motor and of the pump, allows the rammer to move micrometrically in both directions, i.e. to float, a condition that, with the use of four-quadrant pumps, is difficult to be achieved.
  • the presence of the accumulator 105 allows both to obtain an improvement of the final position, and to control the speed of the ram causing it to move micrometrically in both directions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Presses (AREA)

Claims (8)

  1. Steuerungsverfahren zur Steuerung eines Zylinderstellglieds (115) umfassend eine Kammer (113) an der Stangenseite des Zylinderstellglieds (115) und eine Kammer (114) an der Kopfseite des Zylinderstellglieds (115), wobei das Zylinderstellglied (115) dafür ausgelegt ist, einen Stößel einer Presse zu betätigen, wobei das Steuerungsverfahren umfasst:
    - Bereitstellen eines Speichers (105), der nur mit der genannten Kammer (113) an der Stangenseite des Zylinderstellglieds (115) verbunden ist;
    - Betätigen einer Motorgruppe (101), der eine Pumpengruppe (102) bestehend aus einer 2-Quadranten-Pumpe, die über ein Absperrventil (116) unmittelbar in Fluidverbindung mit der genannten Kammer (114) an der Kopfseite des genannten Zylinderstellglieds (115) durch einen fluiddynamischen Kreislauf für ein Zufuhrfluid steht und die eine aktive Drehung (DX) und eine passive Gegendrehung (SX) hat, zugeordnet ist;
    - Hin- und Herbewegen des genannten Zylinderstellglieds (115) zwischen einem aktiven Arbeitshub während der genannten aktiven Drehung (DX) und einem Rückhub während der genannten Gegendrehung (SX), worin der Bewegung des Zylinderstellglieds (115) in der Phase des Abstiegs vom Druck in der Kammer (113) an der Stangenseite des Zylinderstellglieds (115), die mit dem genannten Speicher (105) in Fluidverbindung steht, entgegengewirkt wird;
    - Steuern durch die genannte Motorgruppe und Pumpengruppe (101, 102) zumindest eines von dem genannten aktiven Hub und/oder Rückhub während zumindest einer von der genannten aktiven Drehung (DX) und/oder der genannten Gegendrehung (SX);
    - Detektieren durch einen Druckgeber (112) des Erreichens eines programmierten Druckwertes, auf den ein Druckminderer (108) gesetzt ist, um den Druck innerhalb des Speichers (105) zu steuern, worin das genannte Steuern umfasst:
    - mikrometrisches Steuern einer aktiven Arbeitsgeschwindigkeit des genannten aktiven Hubs und/oder einer Rücklaufgeschwindigkeit des genannten Rückhubs; und
    - Halten des genannten Zylinderstellglieds (115) in einem schwebenden Zustand zwischen dem genannten aktiven Hub und dem genannten Rückhub.
  2. Verfahren nach Anspruch 1, worin die genannte Motorgruppe einen bürstenlosen Motor (101) umfasst.
  3. Verfahren nach Anspruch 1, worin der genannte aktive Hub alternativ das Stanzen, Biegen, Formen von Werkstücken umfasst.
  4. Verfahren nach Anspruch 1, worin die Abwärtsbewegung des genannten Zylinderstellglieds (115) von der Differenz der Drücke der Zufuhrfluidvolumina, die in den genannten Kammern (114, 113) vorhanden sind, gesteuert wird.
  5. System zur Steuerung eines Zylinderstellglieds (115) umfassend eine Kammer (113) an der Stangenseite des Zylinderstellglieds (115) und eine Kammer (114) an der Kopfseite des Zylinderstellglieds (115), wobei das Zylinderstellglied (115) dafür ausgelegt ist, einen Stößel einer Presse durch Hin- und Herbewegen des genannten Stößels zumindest in einen aktiven Arbeitshub oder in einen passiven Rückhub zu betätigen, wobei das System umfasst:
    - eine Motorgruppe (101);
    - eine Pumpengruppe (102) bestehend aus einer 2-Quadranten-Pumpe, die über ein Absperrventil mit der genannten Kammer (114) an der Kopfseite des Zylinderstellglieds (115) unmittelbar verbunden ist, die der genannten Motorgruppe (101) zugeordnet ist und dafür ausgelegt ist, ein Zufuhrfluid zur genannten Kammer (114) am Kopf des Zylinderstellglieds (115) zu pumpen;
    - einen Speicher (105), der nur mit der genannten Kammer (113) an der Stangenseite des Zylinderstellglieds (115) in Fluidverbindung steht und dafür ausgelegt ist, der Phase des Abstiegs des genannten Zylinderstellglieds (115) entgegenzuwirken;
    - einen verbindenden und fördernden fluiddynamischen Kreislauf, der die genannte Pumpengruppe (102) mit dem genannten Zylinderstellglied (115) und mit dem genannten Speicher (105) über Hydraulikleitungen (x, o, #) verbindet und ein Zufuhrfluid zwischen ihnen fördert;
    wobei das System ferner umfasst:
    - Steuerungsmittel zumindest des genannten aktiven Arbeitshubs oder des genannten passiven Rückhubs, die dafür ausgelegt sind, das genannte Zylinderstellglied in einem schwebenden Zustand dazwischen zu halten, bestehend aus der genannten Motorgruppe (101), die der genannten Pumpengruppe (102) zugeordnet ist, und aus dem genannten Speicher (105);
    - eine Zufuhreinheit (106), die zwischen der genannten Motorgruppe (101), der genannten Pumpengruppe (102) und dem genannten Speicher (105) zwischengeschaltet ist, wobei die genannte Zufuhreinheit einen Druckminderer umfasst, um einen programmierten Druckwert zu setzen, um den Druck innerhalb des Speichers (105) zu steuern;
    - einen Druckgeber (112) zum Detektieren, wenn der genannte programmierte Druckwert erreicht wird.
  6. System nach Anspruch 5, worin die genannte Motorgruppe einen bürstenlosen Motor (101) umfasst.
  7. System nach Anspruch 5 oder 6, worin die genannte Zufuhreinheit (106) ein Ein-Richtungs-Ventil (107) umfasst, um zu verhindern, dass das Zufuhrfluid unter Druck aus dem Speicher (105) unmittelbar zum Reservoir (103) ausfließt, um das Umgehen des genannten Zylinderstellglieds (115) zu vermeiden.
  8. System nach einem der Ansprüche 5-7, worin die genannte Zufuhreinheit (106) ein Elektroventil (109) umfasst, um dem Zufuhrfluid selektiv zu ermöglichen oder es daran zu hindern, den genannten Speicher (105) zu erreichen.
EP22156619.3A 2016-06-14 2017-06-14 Verfahren und system zur steuerung eines aktuators eines stössels einer presse Active EP4043197B1 (de)

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ITUA2016A004346A ITUA20164346A1 (it) 2016-06-14 2016-06-14 Un metodo ed un impianto per il controllo di un attuatore di una slitta di una pressa
PCT/IB2017/053525 WO2017216737A1 (en) 2016-06-14 2017-06-14 A method and a system for controlling an actuator of a ram of a press
EP17745498.0A EP3468788A1 (de) 2016-06-14 2017-06-14 Verfahren und system zur steuerung eines aktuators eines stössels einer presse

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US11260441B2 (en) * 2017-11-24 2022-03-01 Danieli & C. Officine Meccaniche S.P.A. Press for extruding metal material
IT201900010191A1 (it) * 2019-06-26 2020-12-26 Salvagnini Italia Spa Macchina per lavorare lamiere metalliche
IT201800009060A1 (it) * 2018-10-01 2020-04-01 Salvagnini Italia Spa Sistema di azionamento idraulico per un apparato di punzonatura
BR112021003358A2 (pt) * 2018-10-01 2021-05-11 Salvagnini Italia S.P.A. máquina para trabalhar folha metálica, e, método para acionar uma pluralidade de ferramentas de trabalho
CN111572082B (zh) * 2020-04-17 2021-11-30 江苏国力锻压机床有限公司 一种玻璃钢制品的液压加工方法
DE102021101539A1 (de) * 2021-01-25 2022-07-28 Langenstein & Schemann Gmbh Hydraulische Umformmaschine zum Pressen von Werkstücken, insbesondere Schmiedehammer, und Verfahren zum Betreiben einer hydraulischen Umformmaschine, insbesondere eines Schmiedehammers

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JP2000329104A (ja) * 1999-05-20 2000-11-28 Kawasaki Hydromechanics Corp 押圧用の油圧制御方法
EP1279488B1 (de) * 2000-03-06 2010-06-30 Amada Company, Ltd. Verfahren und vorrichtung zur regelung der endposition einer hydraulischen presse sowie verfahren und vorrichtung zur fehlererkennung bei einem geschwindigkeitswahlventil
US7051526B2 (en) * 2004-10-01 2006-05-30 Moog Inc. Closed-system electrohydraulic actuator
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DE102012104125A1 (de) * 2012-05-10 2013-11-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren zum Betreiben einer hydraulischen Presse und eine hydraulische Presse
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EP4043197A1 (de) 2022-08-17
WO2017216737A1 (en) 2017-12-21
EP3468788A1 (de) 2019-04-17

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