EP1593444A1 - Punch assembly - Google Patents

Punch assembly Download PDF

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Publication number
EP1593444A1
EP1593444A1 EP05103777A EP05103777A EP1593444A1 EP 1593444 A1 EP1593444 A1 EP 1593444A1 EP 05103777 A EP05103777 A EP 05103777A EP 05103777 A EP05103777 A EP 05103777A EP 1593444 A1 EP1593444 A1 EP 1593444A1
Authority
EP
European Patent Office
Prior art keywords
valve
chamber
punch
punch assembly
pressurized fluid
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.)
Withdrawn
Application number
EP05103777A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stefano Raimondi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rainer SRL
Original Assignee
Rainer SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rainer SRL filed Critical Rainer SRL
Publication of EP1593444A1 publication Critical patent/EP1593444A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B30B15/161—Control arrangements for fluid-driven presses controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/20—Applications of drives for reducing noise or wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
    • B30B1/323—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure using low pressure long stroke opening and closing means, and high pressure short stroke cylinder 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
    • 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
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach 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
    • 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
    • F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
    • 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
    • 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
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control 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
    • F15B2211/32—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
    • F15B2211/50—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
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control 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
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

Definitions

  • the present invention relates to a punch assembly.
  • a punch assembly comprising a ram movable along a given longitudinal axis; and an actuating device for moving the ram axially in a straight reciprocating movement comprising a down stroke to punch at least one sheet, and a return stroke.
  • the actuating devices of known punch assemblies of the above type are normally of two types.
  • the actuating device comprises a hydraulic pump, and a hydraulic circuit for supplying the ram with pressurized fluid, and has various drawbacks due to losses mainly caused by the efficiency of the hydraulic pump and leakage in the hydraulic supply circuit.
  • the actuating device comprises an electric motor having an output shaft normally connected to the ram by a screw-nut screw coupling, and has various drawbacks, mainly due to the fact that, for the thrust exerted on the ram to be greater than the resisting force of the sheet, the electric motor and the screw-nut screw coupling must be designed as a function of relatively high resisting force values, and as such are relatively expensive and bulky.
  • Number 1 in Figure 1 indicates as a whole a punch assembly for punching sheet metal or similar, and comprising a tubular supporting frame 2 having a substantially vertical longitudinal axis 3 and in turn comprising a wide top portion 4 and a narrow bottom portion 5.
  • Assembly 1 also comprises a ram 6 movable along frame 2 in a vertical direction 7 parallel to axis 3; and an actuating device 8 for imparting to ram 6 a straight reciprocating movement comprising a down stroke, in which ram 6 moves from a raised position to a lowered position to punch at least one metal sheet (not shown), and a return stroke, in which ram 6 moves back into the raised position.
  • Ram 6 comprises a top member 9 mounted coaxially with axis 3 and in turn comprising a substantially cup-shaped top portion 10 extending along portion 4, and a pin-like bottom portion 11 extending along portion 5 of frame 2.
  • Portion 10 is connected by a screw-nut screw coupling to a screw 12 forming part of device 8, and which is rotated about axis 3 by an electric motor 13 having an output shaft 14, which is mounted to rotate about a longitudinal axis 15 substantially parallel to axis 3, and is connected to screw 12 by a belt drive 16 comprising two pulleys 17 fitted to shaft 14 and screw 12 respectively, and a belt 18 looped about pulleys 17.
  • member 9 is moved in direction 7 between the raised and lowered positions with a given law of motion.
  • Ram 6 also comprises a bottom member 19 in turn comprising a tubular top body 20, which is fitted in sliding manner to both portion 5 of frame 2 and portion 11 of member 9, defines a variable-volume, annular first chamber 21 together with frame 2 and portion 11 of member 9, and is closed at a free end by a pin 22.
  • pin 22 activates a punch (not shown) for working the metal sheet (not shown), and defines, together with body 20 and with a piston 23 fixed to the end of portion 11 and perpendicular to axis 3, a variable-volume, cylindrical second chamber 24 with a smaller cross section than chamber 21.
  • chambers 21 and 24 form part of a hydraulic oil circuit 25 comprising a first portion 26, which extends between chambers 21 and 24, and has a valve device 27 for selectively controlling pressurized-oil flow between chambers 21 and 24.
  • Device 27 comprises a known first valve 28 having a slide 29, which is normally maintained by a spring 30 in a closed position closing portion 26 ( Figures 2, 4, 5), and is moved, in opposition to spring 30 and by the pressurized oil, from the closed position to an open position ( Figure 3) permitting oil flow from chamber 24 to chamber 21.
  • Device 27 also comprises a known second valve 31, which is mounted parallel to valve 28, is normally set to a closed position closing portion 26, and is movable by the pressurized oil from the closed position to an open position permitting oil flow from chamber 21 to chamber 24.
  • Chamber 21 communicates hydraulically with an oil tank 32 via a second portion 33 of circuit 25 having three valve devices 34, 35, 36 for selectively controlling pressurized-oil flow between tank 32 and chamber 21.
  • Device 34 comprises a known first valve 37 having a slide 38, which is normally maintained by a spring 39 in a closed position closing portion 33 ( Figures 2, 3, 4), and is moved, in opposition to spring 39 and by the pressurized oil, from the closed position to an open position ( Figure 5) permitting oil flow from chamber 21 to tank 32.
  • Device 34 also comprises a known second valve 40, which is mounted parallel to valve 37, is normally set to a closed position closing portion 33, and is movable by the pressurized oil from the closed position to an open position permitting oil flow from tank 32 to chamber 21.
  • Device 35 is mounted between chamber 21 and device 34, and comprises a slide 41, which is normally maintained by a spring 42 in a first operating position ( Figures 2, 3) permitting pressurized-oil flow from tank 32 to chamber 21, and is moved, in opposition to spring 42 and by an actuating device (not shown) controlled by an electronic central control unit (not shown), from the first operating position to a second operating position ( Figures 4, 5) permitting oil flow from chamber 21 to tank 32.
  • Device 36 comprises a known valve 43, which is mounted parallel to devices 34 and 35, is normally set to a closed position closing portion 33, and is movable by the pressurized oil from the closed position to an open position permitting oil flow from tank 32 to chamber 21.
  • Electric motor 13 is operated to rotate output shaft 14 and, therefore, screw 12 to move top member 9 of ram 6 in direction 7 with said given law of motion.
  • bottom member 19 is moved downwards in direction 7 by top member 9 via the interposition of the oil in chamber 24 and into contact with said punch (not shown), and the volume of chamber 21 increases to open valves 40 and 43 and so feed the oil in tank 32 to chamber 21.
  • the electronic central control unit moves slide 41 into the second operating position, the rotation direction of screw 12 is inverted, and members 9 and 19 are moved in direction 7 from the lowered position to the raised position with the same law of motion, i.e. the law of motion imposed on members 9 and 19 by rotation of screw 12.
  • the oil in chamber 24 is first compressed by piston 23 to open valve 28 ( Figure 3), and is then fed from chamber 24 to chamber 21. Since chamber 21 has a larger cross section than chamber 24, the pressure of the oil in chamber 21 generates on member 19, and therefore on the punch (not shown), a thrust which is greater than the thrust generated by the pressure of the oil in chamber 24, is greater than the resisting force of the metal sheet (not shown), thus enabling the punch (not shown) to punch the metal sheet (not shown), and moves member 19 downwards in direction 7 with a different law of motion from that of member 9, i.e. from the law of motion imposed by rotation of screw 12.
  • valve device 35 prevents the oil fed along portion 26 and through valve 28 from opening valve 37 and so being fed to tank 32.
  • Punch assembly 1 therefore has various advantages, mainly due to the fact that, when the resisting force of the metal sheet (not shown) is below said given value, the metal sheet (not shown) is punched by means of the thrust imparted to members 9 and 19 by electric motor 13, i.e. by a relatively small electric motor, whereas, when the resisting force of the metal sheet (not shown) is greater than said given value, the metal sheet (not shown) is punched by means of the thrust imparted to member 19 by the pressurized oil in hydraulic circuit 25, i.e. in a hydraulic circuit with no hydraulic pumps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Press Drives And Press Lines (AREA)
EP05103777A 2004-05-06 2005-05-05 Punch assembly Withdrawn EP1593444A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO20040291 2004-05-06
ITBO20040291 ITBO20040291A1 (it) 2004-05-06 2004-05-06 Gruppo di punzonatura.

Publications (1)

Publication Number Publication Date
EP1593444A1 true EP1593444A1 (en) 2005-11-09

Family

ID=34939716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05103777A Withdrawn EP1593444A1 (en) 2004-05-06 2005-05-05 Punch assembly

Country Status (2)

Country Link
EP (1) EP1593444A1 (it)
IT (1) ITBO20040291A1 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015042418A (ja) * 2013-07-26 2015-03-05 株式会社三井ハイテック 薄板凹凸部材の製造装置及び製造方法
DE102014214739B3 (de) * 2014-07-28 2015-12-31 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Stanzvorrichtung, verfahren zum stanzen eines werkstücks und computerprogrammprodukt zur durchführung des verfahrens
CN111889561A (zh) * 2019-05-06 2020-11-06 莱玛特·沃尔特斯有限公司 精冲系统及其操作方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60247495A (ja) * 1984-05-22 1985-12-07 Mitsubishi Electric Corp 加圧プレス
JP2000246366A (ja) * 1999-02-25 2000-09-12 Amada Co Ltd タレットパンチプレス
JP2001150191A (ja) * 1999-11-26 2001-06-05 Hoden Seimitsu Kako Kenkyusho Ltd 加圧装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60247495A (ja) * 1984-05-22 1985-12-07 Mitsubishi Electric Corp 加圧プレス
JP2000246366A (ja) * 1999-02-25 2000-09-12 Amada Co Ltd タレットパンチプレス
JP2001150191A (ja) * 1999-11-26 2001-06-05 Hoden Seimitsu Kako Kenkyusho Ltd 加圧装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 118 (M - 475) 2 May 1986 (1986-05-02) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 12 3 January 2001 (2001-01-03) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 23 10 February 2001 (2001-02-10) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015042418A (ja) * 2013-07-26 2015-03-05 株式会社三井ハイテック 薄板凹凸部材の製造装置及び製造方法
DE102014214739B3 (de) * 2014-07-28 2015-12-31 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Stanzvorrichtung, verfahren zum stanzen eines werkstücks und computerprogrammprodukt zur durchführung des verfahrens
WO2016016102A1 (de) * 2014-07-28 2016-02-04 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Stanzvorrichtung und verfahren zum stanzen eines werkstücks
CN106536081A (zh) * 2014-07-28 2017-03-22 通快机床两合公司 用于冲压工件的冲压装置和方法
CN106536081B (zh) * 2014-07-28 2019-03-22 通快机床两合公司 用于冲压工件的冲压装置和方法
US10328478B2 (en) 2014-07-28 2019-06-25 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Punching a workpiece
CN111889561A (zh) * 2019-05-06 2020-11-06 莱玛特·沃尔特斯有限公司 精冲系统及其操作方法
EP3736061A1 (en) * 2019-05-06 2020-11-11 Lapmaster Wolters GmbH Fine blanking system and method for operating the same
US11779988B2 (en) 2019-05-06 2023-10-10 Lapmaster Wolters Gmbh Fine blanking system and method of operating

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Publication number Publication date
ITBO20040291A1 (it) 2004-08-06

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