US20030070463A1 - High performance bending machine with reduced energy dispersion - Google Patents

High performance bending machine with reduced energy dispersion Download PDF

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Publication number
US20030070463A1
US20030070463A1 US10/266,862 US26686202A US2003070463A1 US 20030070463 A1 US20030070463 A1 US 20030070463A1 US 26686202 A US26686202 A US 26686202A US 2003070463 A1 US2003070463 A1 US 2003070463A1
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US
United States
Prior art keywords
pump
swivel angle
pressure
bending machine
valve
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.)
Abandoned
Application number
US10/266,862
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English (en)
Inventor
Wolfgang Kunze
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.)
Salvagnini Italia SpA
Original Assignee
Salvagnini Italia SpA
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 Salvagnini Italia SpA filed Critical Salvagnini Italia SpA
Assigned to SALVAGNINI ITALIA S.P.A. reassignment SALVAGNINI ITALIA S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUNZE, WOLFGANG
Publication of US20030070463A1 publication Critical patent/US20030070463A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work

Definitions

  • This invention refers to a machine for programmed sheet bending of the general type known in the art as panel bender.
  • These panel benders are able to automatically move a sheet metal blank on a horizontal surface placed in front of a bending press provided with a bending unit with one or two bending blades, which is able to perform a number of bends of variable size, angle and direction on each side of the blank.
  • the bending press also comprises a fixed counter-blade and a blank-holder of variable size which cooperates with the counter-blade for clamping the blank near the edge to be bent.
  • the bending unit and the blank-holder are activated by controlled hydraulic actuators consisting of hydraulic cylinders.
  • An example of this state of the art is given by the European patent EP-A-0293964.
  • a drawback consists in low energetic efficiency due to the great quantity of hydraulic energy dispersed in heat and cooled by an appropriate chiller.
  • the controlled actuators of the bending unit receive the energy from a constant power hydraulic pump, which derives the power from a hydraulic circuit with a pressure limiting device and a flow rate regulator.
  • the inertia of the operation of the hydraulic pump becomes dispersed energy transformed in heat.
  • the object of the present invention is to provide a sheet metal bending machine with programmable reduced energy if maximum production rate is not required.
  • a bending machine comprising a bending unit which is moved by hydraulic actuators controlled by a hydraulic pump, characterised in that the hydraulic pump is a variable displacement pump provided with an electronic closed-loop flow rate, pressure and power control system including an electrically controlled proportional valve.
  • FIG. 1 shows the mechanical part of a bending press provided with a hydraulically controlled bending unit
  • FIG. 2 shows a control system for hydraulic actuators of a bending unit as shown in FIG. 1.
  • the bending press shown in FIG. 1 comprises a fixed base 1 , which supports a counter-blade 2 on which a lateral edge of a sheet metal blank 3 moved by a manipulator (not shown) rests.
  • a blank-holder 4 cooperates with the counter-blade 3 to clamp the sheet metal edge.
  • the blank-holder is attached to the front end of a movable support 5 , which has a front end hinged at 6 on a rear part of the fixed base 1 .
  • the support 5 is moved up and down by a plurality of hydraulic cylinders 7 .
  • a bending unit 8 comprises a common support 9 for two bending blades 10 and 11 which cooperate with the counter-blade 2 to cause bending of the clamped edge of the sheet metal.
  • the bending unit is subjected to combined horizontal and vertical movements by hydraulic actuators consisting of hydraulic cylinders 12 interposed between the rear part of the base 1 and a lever 13 having a fixed hinge 14 and a mobile hinge 100 , and of further hydraulic cylinders 15 interposed between the blade support 9 and the fixed base 1 .
  • the hydraulic actuators 12 and 15 are controlled by a control system schematically shown in FIG. 2 (where S indicates a fluid tank) and including a variable displacement hydraulic pump 16 .
  • variable displacement pump 16 is driven by an electric motor 17 and comprises, as usual, a pump body 18 and a rotatable tiltable swashplate 19 acting on axial pistons (not shown) to cause fluid displacement with a flow rate depending on the swivel angle of the swashplate 19 .
  • This angle is forced to a maximum value by a piston 20 slidingly housed in a hydraulic cylinder 21 subjected to the pump pressure and pushed by a spring 22 and can be reduced by the action of a control piston 23 which is slidingly housed in a hydraulic cylinder 24 controlled by an electrically controlled proportional valve 25 included in a closed loop control system.
  • the proportional valve 25 is provided with a valve spool 26 pushed in the position of FIG. 2 by a spring 41 and controlled by a proportional control solenoid 27 which receives a control signal 28 from an electronic programmed control unit 29 provided with command values provided by an operator or a programmed electronic control system, such as a pressure value 30 , a power value 31 and a flow rate value 32 and provided with an amplifier stage 33 having input signals consisting of a valve spool position signal 34 coming from an inductive position transducer 35 associated with the valve spool 26 , a swivel angle signal 36 coming from a swivel angle transducer 37 associated with the control piston 23 and a pump pressure signal 38 coming from a pressure transducer 39 arranged on the pump delivery.
  • a valve spool position signal 34 coming from an inductive position transducer 35 associated with the valve spool 26
  • a swivel angle signal 36 coming from a swivel angle transducer 37 associated with the control piston 23
  • a pressure limiting device 40 is finally provided between the pump delivery and the fluid tank S.
  • the electronic control unit 29 When the electronic control unit 29 is active, the actual pressure value (signal 38 ), the valve spool position (signal 34 ) and the pump swivel angle (signal 36 ) are compared with the command values 30 , 31 , 32 by the electronic control unit 29 . Any detected control deviations are processed further and generate a control signal 28 for the proportional solenoid 27 , which moves the valve spool 26 from a central position corresponding to detected values 28 , 36 , 38 equal to the command values 30 , 31 , 32 according to said deviations.
  • the control signal 28 causes the electric current through the solenoid 27 to increase in order to move the valve spool 26 from the central position to the right until the swivel angle has reached the required value.
  • a reduction of the solenoid current causes the valve spool 26 to move to the left to reduce the swivel angle and therefore the fluid flow rate to the actuators 12 , 15 .
  • the hydraulic power supplied to the actuators may be programmed according to the desired production rate so as to obtain a reduced energy consumption.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Control Of Presses (AREA)
  • Press Drives And Press Lines (AREA)
  • Presses And Accessory Devices Thereof (AREA)
US10/266,862 2001-10-11 2002-10-08 High performance bending machine with reduced energy dispersion Abandoned US20030070463A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6,636/2001 2001-10-11
JP2001006636U JP3085306U (ja) 2001-10-11 2001-10-11 曲げ加工装置

Publications (1)

Publication Number Publication Date
US20030070463A1 true US20030070463A1 (en) 2003-04-17

Family

ID=18874494

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/266,862 Abandoned US20030070463A1 (en) 2001-10-11 2002-10-08 High performance bending machine with reduced energy dispersion

Country Status (8)

Country Link
US (1) US20030070463A1 (ko)
EP (1) EP1302252B1 (ko)
JP (1) JP3085306U (ko)
KR (1) KR100880244B1 (ko)
AT (1) ATE275009T1 (ko)
CA (1) CA2397422A1 (ko)
DE (1) DE60201114T2 (ko)
ES (1) ES2227392T3 (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150107070A1 (en) * 2007-03-13 2015-04-23 Moran BORENSTEIN Method and apparatus for forming a bent sheet of foil
US20160318085A1 (en) * 2013-12-30 2016-11-03 Cosma S.R.L. Machine for bending sheet metal
US10464115B2 (en) 2014-06-10 2019-11-05 Trumpf Maschinen Austria Gmbh & Co. Kg. Bending press having bending unit, and reshaping method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101052482B (zh) * 2004-10-22 2012-11-21 芬兰电力私人有限公司 金属板弯曲成型机工作单元位移运动系统
JP4910097B2 (ja) 2011-07-25 2012-04-04 コージ産業株式会社 棚装置
ITMI20121583A1 (it) * 2012-09-24 2014-03-25 Salvagnini Italia Spa Macchina pannellatrice a lama orientabile.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116122A (en) * 1976-10-11 1978-09-26 Osterwalder Ag Hydraulic driven press
US4708596A (en) * 1984-06-14 1987-11-24 Robert Bosch Gmbh Device for regulating pressure and delivery of and adjustable pump
US6375433B1 (en) * 2000-07-07 2002-04-23 Caterpillar Inc. Method and apparatus for controlling pump discharge pressure of a variable displacement hydraulic pump

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1204674B (it) * 1987-06-03 1989-03-10 Salvagnini Transferica Spa Macchina piegatrice per fogli di lamiera con premilamiera a compressione uniforme
IT1258577B (it) * 1992-04-22 1996-02-27 Antonio Codatto Dispositivo di movimentazione per lame di pressa piegatrice per lamiere

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116122A (en) * 1976-10-11 1978-09-26 Osterwalder Ag Hydraulic driven press
US4708596A (en) * 1984-06-14 1987-11-24 Robert Bosch Gmbh Device for regulating pressure and delivery of and adjustable pump
US6375433B1 (en) * 2000-07-07 2002-04-23 Caterpillar Inc. Method and apparatus for controlling pump discharge pressure of a variable displacement hydraulic pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150107070A1 (en) * 2007-03-13 2015-04-23 Moran BORENSTEIN Method and apparatus for forming a bent sheet of foil
US20160318085A1 (en) * 2013-12-30 2016-11-03 Cosma S.R.L. Machine for bending sheet metal
US10471488B2 (en) * 2013-12-30 2019-11-12 Cosma S.R.L. Machine for bending sheet metal
US10464115B2 (en) 2014-06-10 2019-11-05 Trumpf Maschinen Austria Gmbh & Co. Kg. Bending press having bending unit, and reshaping method

Also Published As

Publication number Publication date
KR100880244B1 (ko) 2009-01-28
CA2397422A1 (en) 2003-04-11
ATE275009T1 (de) 2004-09-15
KR20030030954A (ko) 2003-04-18
DE60201114D1 (de) 2004-10-07
DE60201114T2 (de) 2005-09-01
ES2227392T3 (es) 2005-04-01
JP3085306U (ja) 2002-04-26
EP1302252B1 (en) 2004-09-01
EP1302252A1 (en) 2003-04-16

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Date Code Title Description
AS Assignment

Owner name: SALVAGNINI ITALIA S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KUNZE, WOLFGANG;REEL/FRAME:013373/0358

Effective date: 20020620

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION