EP1466677A1 - Device for handling the upper moving table carrying the punch in a bending press - Google Patents

Device for handling the upper moving table carrying the punch in a bending press Download PDF

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Publication number
EP1466677A1
EP1466677A1 EP04006800A EP04006800A EP1466677A1 EP 1466677 A1 EP1466677 A1 EP 1466677A1 EP 04006800 A EP04006800 A EP 04006800A EP 04006800 A EP04006800 A EP 04006800A EP 1466677 A1 EP1466677 A1 EP 1466677A1
Authority
EP
European Patent Office
Prior art keywords
hinged
upper table
main lever
crank
punch
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.)
Granted
Application number
EP04006800A
Other languages
German (de)
French (fr)
Other versions
EP1466677B1 (en
Inventor
Antonio Manini
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.)
Schiavi Macchine Industriali SpA
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FIM SpA
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Publication date
Application filed by FIM SpA filed Critical FIM SpA
Publication of EP1466677A1 publication Critical patent/EP1466677A1/en
Application granted granted Critical
Publication of EP1466677B1 publication Critical patent/EP1466677B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means

Definitions

  • Object of the present invention is a device for handling the upper moving table carrying the punch in a bending press.
  • the bending presses have a structure that is mainly composed of a lower table on which tools (matrix dies) rest and an upper table that supports the punches to perform a bend on the sheet that is placed onto the matrix die.
  • the upper table is moved by thrust actuators consisting in two hydraulic cylinders controlled by an hydraulic unit.
  • the thrust actuators must carry out an approaching stroke of the two tables at high speed in order to reduce the time necessary for approaching to a minimum.
  • the quick approaching phase exploits the force of gravity in order to make the upper table fall; during the pressing operation, the slow speed is realised by suitably dimensioning flow rate and pressure of the hydraulic unit pump.
  • the handling system of the hydraulic type has several inconveniences, among which:
  • Object of the present invention is completely removing all inconveniences due to the use of an hydraulic system by realising an handling device of the upper table of the electro-mechanical type.
  • the device of the present invention that is characterised in that it provides what is stated in the below-listed claims, and particularly in that, for every pillar guiding the vertical translation of the punch-carrying upper table, it comprises a main lever axially hinged to the pillar and whose driving arm is hinged onto means translating along a bar hinged to the head and it further comprises a crank, a connecting rod, hinged to the upper table, being hinged to the crank eccentric, the crank being rotated by the main lever resisting arm.
  • number 1 shows a lower table of a bending press designated as a whole as 2.
  • the lower table has a matrix die 3 on which a sheet foil to be bent is rested.
  • Number 4 designates an upper table that can vertically translate along guiding pillars 5 in order to go from a top dead center to a bottom dead center and vice versa.
  • the tool or punch 6 adapted to press onto the sheet next to the below matrix die to perform the bending, is assembled onto the upper table.
  • Number 7 designates two perfectly identical devices for moving the upper table.
  • Each one of said devices comprises a threaded bar 8 that can be rotated by an electric ratio-motor, not shown.
  • a scroll 9 adapted to translate along the threaded bar when this latter one is rotated, is inserted on the threaded bar.
  • the threaded bar rotates free with respect to a U-bolt 15 hinged to the upper table in a central position 16 with respect to the guiding bars.
  • the threaded bar is a rod hinged to the upper table along which displacing means of a main lever 10 car slide.
  • crank 12 is hinged to the resisting arm 10b of the main lever 10, such crank 12 having an eccentric 13 to which a connecting rod 14 is hinged, such connecting rod transforming the crank rotating motion into a rectilinear translating motion and transmitting this latter one to the upper table in the way that will be described below with reference to figures 2, 2A, 3,3A ,4 and 4A.
  • the upper table is in the top dead center in the starting position of the quick approach step.
  • the upper table of the bending press will perform the quick descent step, such descent being controlled by the threaded bar and by the connecting rod-crank system, till the connecting rod is taken into a substantially vertical position axial with the driving risers.
  • the main lever is not subjected to rotations, but a simple vertical translation by moving its rotating point only, as shown in figures 3 and 3A.
  • the pressing step then begins through the action of the main lever that highly reduces the table descent speed, highly increasing the thrust force.
  • the two main lever arms are in a ratio of about 8-10 so that a thrust multiplication of this ratio on the table will be obtained.
  • a further advantage of the present invention is that the two threaded bars directly push onto the upper table in a substantially central position, thereby reducing the table flexure, during the pressing step.
  • the threaded bar with scroll could be replaced by other translating means of the main lever resisting arm, such as, for example a slider sliding along a rack.
  • the eccentric could be replaced by a rod hinged on one side to the connecting rod and on the other side to the crank.
  • the ratio between main lever driving arm and resisting arm can change depending on the thrust that has to be exerted onto the upper table.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Control Of Presses (AREA)
  • Motorcycle And Bicycle Frame (AREA)

Abstract

The invention deals with the field of bending presses, and, more precisely, deals with a device for handling the upper table moving along guiding pillars and carrying the punch. For every table guiding pillar, the device provides for a main lever (10) hinged in a point that is substantially axial with its related guiding pillar and whose driving arm (10a) is hinged to means (9) sliding along a rod (8) hinged to the upper table. The lever resisting arm (10b), whose length is approximately 8-10 times shorter that the driving arm length, rotates a crank (12) connected through an eccentric (13) or a connection rod to a connecting rod (14) that transmits the translating motion to the upper table.

Description

  • Object of the present invention is a device for handling the upper moving table carrying the punch in a bending press.
  • As known, the bending presses have a structure that is mainly composed of a lower table on which tools (matrix dies) rest and an upper table that supports the punches to perform a bend on the sheet that is placed onto the matrix die.
  • The upper table is moved by thrust actuators consisting in two hydraulic cylinders controlled by an hydraulic unit.
  • The thrust actuators must carry out an approaching stroke of the two tables at high speed in order to reduce the time necessary for approaching to a minimum.
  • In the currently marketed bending presses with hydraulic actuators composed of two cylinders, the quick approaching phase exploits the force of gravity in order to make the upper table fall; during the pressing operation, the slow speed is realised by suitably dimensioning flow rate and pressure of the hydraulic unit pump.
  • The handling system of the hydraulic type has several inconveniences, among which:
    • due to the internal friction effect of thrust cylinders, the upper table free fall occurs with very low accelerations, with consequent loss of time;
    • the hydraulic system provides for the use of high amounts of oil with great burdens for user customers as regards maintenance, installation and spent oil disposal.
  • Object of the present invention is completely removing all inconveniences due to the use of an hydraulic system by realising an handling device of the upper table of the electro-mechanical type.
  • This and other objects are fully obtained by the device of the present invention, that is characterised in that it provides what is stated in the below-listed claims, and particularly in that, for every pillar guiding the vertical translation of the punch-carrying upper table, it comprises a main lever axially hinged to the pillar and whose driving arm is hinged onto means translating along a bar hinged to the head and it further comprises a crank, a connecting rod, hinged to the upper table, being hinged to the crank eccentric, the crank being rotated by the main lever resisting arm.
  • These and other characteristics will be better pointed out by the following description of a preferred embodiment, shown merely as a non-limiting example in the enclosed tables of drawing, in which:
    • figure 1 schematically shows the bending press in a front elevation view
    • figures 2 and 2A show the press and its related detail with the handling device in its top dead center in the approaching starting step;
    • figures 3 and 3A show the press and its related detail in the speed change point during the pressing starting step;
    • figures 4 and 4A show the press and its related detail in the pressing ending point and at the beginning of the return step to the top dead center.
  • With reference to figure 1, number 1 shows a lower table of a bending press designated as a whole as 2.
  • The lower table has a matrix die 3 on which a sheet foil to be bent is rested.
  • Number 4 designates an upper table that can vertically translate along guiding pillars 5 in order to go from a top dead center to a bottom dead center and vice versa.
  • The tool or punch 6, adapted to press onto the sheet next to the below matrix die to perform the bending, is assembled onto the upper table.
  • Number 7 designates two perfectly identical devices for moving the upper table.
  • Each one of said devices comprises a threaded bar 8 that can be rotated by an electric ratio-motor, not shown.
  • A scroll 9, adapted to translate along the threaded bar when this latter one is rotated, is inserted on the threaded bar.
  • The threaded bar rotates free with respect to a U-bolt 15 hinged to the upper table in a central position 16 with respect to the guiding bars.
  • The threaded bar is a rod hinged to the upper table along which displacing means of a main lever 10 car slide.
  • The driving arm 10a of the main lever 10, hinged in 11 next to the driving pillar 5 axis, is hinged to the scroll.
  • A crank 12 is hinged to the resisting arm 10b of the main lever 10, such crank 12 having an eccentric 13 to which a connecting rod 14 is hinged, such connecting rod transforming the crank rotating motion into a rectilinear translating motion and transmitting this latter one to the upper table in the way that will be described below with reference to figures 2, 2A, 3,3A ,4 and 4A.
  • With reference to figures 2 and 2A, the upper table is in the top dead center in the starting position of the quick approach step.
  • By rotating the threaded bar, the upper table of the bending press will perform the quick descent step, such descent being controlled by the threaded bar and by the connecting rod-crank system, till the connecting rod is taken into a substantially vertical position axial with the driving risers. During this quick descent step, the main lever is not subjected to rotations, but a simple vertical translation by moving its rotating point only, as shown in figures 3 and 3A.
  • The pressing step then begins through the action of the main lever that highly reduces the table descent speed, highly increasing the thrust force.
  • As can be noted, the two main lever arms are in a ratio of about 8-10 so that a thrust multiplication of this ratio on the table will be obtained.
  • A further advantage of the present invention is that the two threaded bars directly push onto the upper table in a substantially central position, thereby reducing the table flexure, during the pressing step.
  • Moreover, since two different mechanical systems are provided for the two table movements (quick and slow ones), from the machine safety point of view, active optical barriers can be provided for the high approaching speed and the lack of protection at the slow pressing speed.
  • The threaded bar with scroll could be replaced by other translating means of the main lever resisting arm, such as, for example a slider sliding along a rack.
  • According to a possible embodiment variation, not shown, the eccentric could be replaced by a rod hinged on one side to the connecting rod and on the other side to the crank.
  • Obviously, the ratio between main lever driving arm and resisting arm can change depending on the thrust that has to be exerted onto the upper table.

Claims (5)

  1. Device for moving the movable upper table carrying the punch of a bending press and slidable along two guiding pillars (5) characterised in that it comprises, for every guiding riser:
    a main lever (10) hinged next to the vertical axis of its related driving pillar and whose driving arm (10a) is hinged to means translating along a rod hinged to the upper table;
    a crank (12) hinged, through an eccentric (13), to a connecting rod (14) adapted to transmit the rectilinear translating motion to the upper table, said crank being rotated by the resisting arm (10b ) of the main lever (10).
  2. Device according to claim 1, characterised in that the translating means are composed of a scroll (9) slidable along a threaded bar rotated by a ratio-motor.
  3. Device according to claim 1, characterised in that the two threaded bars are placed substantially in a central table area with respect to the table driving pillars in order to reduce the table flexure during the pressing step.
  4. Device according to claim 1, characterised in that the ratio between main lever driving arm and main lever resisting arm is about 8- 10 times.
  5. Device according to claim 1, characterised in that it comprises a joint connection rod placed between crank (12) and connecting rod (14).
EP04006800A 2003-04-09 2004-03-22 Device for handling the upper moving table carrying the punch in a bending press Expired - Lifetime EP1466677B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR20030027 2003-04-09
IT000027A ITPR20030027A1 (en) 2003-04-09 2003-04-09 DEVICE TO HANDLE THE MOBILE UPPER TABLE

Publications (2)

Publication Number Publication Date
EP1466677A1 true EP1466677A1 (en) 2004-10-13
EP1466677B1 EP1466677B1 (en) 2006-05-24

Family

ID=32866078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04006800A Expired - Lifetime EP1466677B1 (en) 2003-04-09 2004-03-22 Device for handling the upper moving table carrying the punch in a bending press

Country Status (5)

Country Link
EP (1) EP1466677B1 (en)
AT (1) ATE327061T1 (en)
DE (1) DE602004000940T2 (en)
ES (1) ES2265612T3 (en)
IT (1) ITPR20030027A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPR20100036A1 (en) * 2010-04-30 2011-10-31 Schiavi Macchine Ind Lavora Zione Lamiera PRESS BRAKE WITH SPEED VARIATOR
CN113828659A (en) * 2021-09-18 2021-12-24 南京邮电大学 Heavy-load high-precision transmission mechanism suitable for metal plate bending equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100006950A1 (en) * 2021-03-23 2022-09-23 Exon S R L PRESS BRAKE.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE845334C (en) * 1950-02-14 1952-07-31 Kieserling & Albrecht Press brake for profile production
GB991095A (en) * 1962-12-11 1965-05-05 Edvard Krogsgaard Iverson Improvements in and relating to hydraulic presses
SE448686B (en) * 1984-07-12 1987-03-16 Dahlstrom Claes Inge Sigfrid Eccentric plate press drive
US6240758B1 (en) * 1999-06-21 2001-06-05 Toyokoki Co., Ltd. Hydraulic machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE845334C (en) * 1950-02-14 1952-07-31 Kieserling & Albrecht Press brake for profile production
GB991095A (en) * 1962-12-11 1965-05-05 Edvard Krogsgaard Iverson Improvements in and relating to hydraulic presses
SE448686B (en) * 1984-07-12 1987-03-16 Dahlstrom Claes Inge Sigfrid Eccentric plate press drive
US6240758B1 (en) * 1999-06-21 2001-06-05 Toyokoki Co., Ltd. Hydraulic machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPR20100036A1 (en) * 2010-04-30 2011-10-31 Schiavi Macchine Ind Lavora Zione Lamiera PRESS BRAKE WITH SPEED VARIATOR
CN113828659A (en) * 2021-09-18 2021-12-24 南京邮电大学 Heavy-load high-precision transmission mechanism suitable for metal plate bending equipment
CN113828659B (en) * 2021-09-18 2024-05-14 南京邮电大学 Heavy-load high-precision transmission mechanism suitable for sheet metal bending equipment

Also Published As

Publication number Publication date
DE602004000940T2 (en) 2007-01-18
EP1466677B1 (en) 2006-05-24
DE602004000940D1 (en) 2006-06-29
ATE327061T1 (en) 2006-06-15
ITPR20030027A1 (en) 2004-10-10
ES2265612T3 (en) 2007-02-16

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