EP0934782A2 - Getriebevorrichtung der Klemmbacken in Umformpressen - Google Patents

Getriebevorrichtung der Klemmbacken in Umformpressen Download PDF

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Publication number
EP0934782A2
EP0934782A2 EP98124307A EP98124307A EP0934782A2 EP 0934782 A2 EP0934782 A2 EP 0934782A2 EP 98124307 A EP98124307 A EP 98124307A EP 98124307 A EP98124307 A EP 98124307A EP 0934782 A2 EP0934782 A2 EP 0934782A2
Authority
EP
European Patent Office
Prior art keywords
intermediary
forming
piston
dies
punches
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Withdrawn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
EP98124307A
Other languages
English (en)
French (fr)
Other versions
EP0934782A3 (de
Inventor
Giorgio Cella
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.)
Tecnostamp Srl
Original Assignee
Tecnostamp 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 Tecnostamp Srl filed Critical Tecnostamp Srl
Publication of EP0934782A2 publication Critical patent/EP0934782A2/de
Publication of EP0934782A3 publication Critical patent/EP0934782A3/de
Withdrawn legal-status Critical Current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
    • B21D5/0209—Tools therefor
    • 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
    • B21D5/0209—Tools therefor
    • B21D5/0236—Tool clamping

Definitions

  • the present invention relates to a drive system, particularly suitable to be used for clamping and unclamping of the jaws of forming presses.
  • Forming presses are normally used for cold forming of metal sheets, and normally comprise series of pairs of opposed tools, punches and dies, shaped according to the forming to be carried out.
  • the punches are normally disposed above the dies and are connected to the movable head of the press, commonly called the top table or slider, for example by means of additional members called intermediaries.
  • the object of the invention is to eliminate said drawbacks by providing a simple and easy-to-make operation system for locking and unlocking the jaws of forming presses.
  • spring means are used which ensure the mechanical retain of the jaws during clamping, while unclamping of the jaws takes place hydraulically.
  • Ducts that pass through the entire jaw are made in the jaws or rear plates.
  • the ducts of a jaw are put into communication with those of the next jaw by means of flexible tubes which are situated at the back of the forming press. Oil enters the chamber in which the piston of the cylindrical actuator is contained through the ducts of the rear jaws and the oil pressure on the surface of the piston compresses the spring means, causing unclamping of the front jaws which retain the tool.
  • This system allows the forming press to work in conditions of maximum safety thanks to the mechanical locking. Furthermore, with this system intermediaries can be made in a single piece without internal ducts able to supply the chamber of the cylindrical actuator piston, which results in considerably less structural complexity with respect to the intermediaries to the prior art.
  • the forming press comprises a movable head called a top table 1 having a substantially rectangular shape and extending the entire length of the press.
  • Clamping of intermediaries 5 in different positions on the top table 1 takes place by means of jaw or bracket means 4.
  • Threaded holes 2 (only one visible in Figure 2) are made in the top table destined to receive a threaded clamping bolt 3.
  • the bolt 3 engages with the jaw 4 by manual screwing causing advancement thereof.
  • the jaw 4 then abuts against the intermediary 5 causing the surface of the intermediary 5 to be drawn against the surface of the top table 1. Retention and clamping of the intermediary 5 to the top table 1 are ensured through engagement of a tooth 6 made in the jaw 4 with a cavity 7 made in the intermediary 5.
  • a cylindrical cavity 8 connected to a second coaxial cylindrical cavity 100 with a smaller diameter than the cavity 8 and extending to the outer front surface of the intermediary 5.
  • the two cavities 8 and 100 are destined to house the drive means of a cylindrical actuator 101 that controls a front jaw 9 able to lock the punch 10 to the intermediary 5.
  • a piston 13 is housed in the cavity 8, said piston bearing a shank 14 with a smaller diameter from which extends a cylindrical rod 15 with an even smaller diameter, about equal to the diameter of the cavity 100 wherein it slides.
  • the front end of the rod 15 protrudes from the front of the intermediary 5 and engages in a cavity 17 made in the front jaw 9.
  • a bolt 11 fixes the jaw 9 to the rod 15, entering the outside of the jaw and screwing into a threaded hole 19 made in the rod.
  • a piston ring 16 is fitted around the piston 13 to ensure a good seal during sliding inside the cavity 8.
  • a pressure spring 18 which pushes the piston backwards causing clamping of the front jaw 9 on the punch 10 is positioned in the seat 8 around the shank 14 of the piston 13. Clamping and retention of the punch 10 are ensured by engagement of a tooth 20 provided in the front jaw 9 in a cavity 21 provided in the punch 10.
  • a rear plate 22 that covers the cavity 8 containing the piston 13 is clamped behind the intermediary 5.
  • the tightness of the back plate 22 is ensured by a gasket 104 placed behind the intermediary 5 around the cavity 8.
  • a main duct 23 that extends longitudinally for the entire length of the plate is made in said rear plate 22.
  • Transverse ducts 24, also made in the rear plate 22, connect the main duct 23 with the cavity 8 that contains the piston 13.
  • a connecting duct 25 is made in the rear plate 22 and extends vertically, starting from the main duct 23 and exiting from the plate to connect with a tube 26 which can preferably be flexible.
  • the tube 26 extends into the rear part of the machine and connects the rear plate 22 with a similar rear plate of an adjacent intermediary.
  • the oil is sent from the hydraulic system of the machine through an input tube similar to the connecting tube 26 and then, through the ducts 25, 23, 24 made in the rear plate 22, enters the cavity 8 exerting pressure on the piston 13; in this manner the elastic force of the spring 18 is overcome and the piston 13 can advance, completing a stroke of about 4.5 mm, causing release of the front jaw 9.
  • a tooth 30 is provided in the intermediary 5 that engages in a cavity 31 made in the punch 10.
  • a die 40 is positioned on a supporting bar 41 to which a front jaw 53 and a rear plate 55 are connected.
  • a first locator 42 is positioned between the front jaw 53 and the front surface of the die 40 and a second locator 43 is positioned between the rear surface of the die 40 and the rear plate 55; the locators 42 and 43 abutting respectively against the front and rear surfaces of the die 40 they ensure that it is centered on the supporting bar 41.
  • a groove containing a piston ring 106 is provided on the rear surface of the front jaw 53, in contact with the supporting bar 41, to avoid dirt depositing between the two contact surfaces.
  • the supporting bar 41 has a first cylindrical cavity 44 at the rear, connected to a second coaxial cylindrical cavity 50 having a smaller diameter than the first cavity 44 and extending to the front surface of the supporting bar 41.
  • the two cavities 44 and 50 are destined to house the drive means of an actuator cylinder 102 that controls movement of the front jaw 53. Five actuator cylinders 102 per meter are usually provided.
  • a piston 46 is housed in the cavity 44 and carries a cylindrical shank 47 with a smaller diameter than said piston 46, ending in a cylindrical rod 48 with a slightly smaller diameter than the cylindrical shank 47 and about equal to the diameter of the second cavity 50 so as to be able to slide therein.
  • a threaded hole 51 is made for engagement of a bolt 52 which serves to lock the front jaw 53.
  • a pressure spring 54 acting on the piston 46 to cause advancement thereof and thus clamping of the jaw 53 which abuts against the locator 42 locking the die 40, which is fixed at the rear by the second locator 43 locked by the rear plate 55.
  • the stroke of the piston 46 is 0.4-0.5 mm, sufficient to allow clamping to be released.
  • a main duct 56 extending the whole length thereof and connecting ducts 57 connected to the main duct 56 and ending in respective cavities 44 made in the supporting bar 41 are provided.
  • the jaw drive system according to the invention allows the forming press to work in conditions of maximum safety thanks to the mechanical clamping of the tools. In this manner pressure can be created in the hydraulic or pneumatic system only for unclamping of the tools.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Press Drives And Press Lines (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
EP98124307A 1998-01-28 1998-12-21 Getriebevorrichtung der Klemmbacken in Umformpressen Withdrawn EP0934782A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI980155 1998-01-28
ITMI980155 IT1298501B1 (it) 1998-01-28 1998-01-28 Sistema di azionamento di ganasce di presse piegatrici

Publications (2)

Publication Number Publication Date
EP0934782A2 true EP0934782A2 (de) 1999-08-11
EP0934782A3 EP0934782A3 (de) 2003-01-08

Family

ID=11378737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98124307A Withdrawn EP0934782A3 (de) 1998-01-28 1998-12-21 Getriebevorrichtung der Klemmbacken in Umformpressen

Country Status (2)

Country Link
EP (1) EP0934782A3 (de)
IT (1) IT1298501B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002013985A1 (de) * 2000-08-14 2002-02-21 Trumpf Maschinen Austria Gmbh & Co. Kg Werkzeugspannvorrichtung für ein formwerkzeug, insbesondere einer abkantpresse
US6395109B1 (en) 2000-02-15 2002-05-28 Cargill, Incorporated Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
AT414327B (de) * 2003-05-14 2007-09-15 Trumpf Maschinen Austria Gmbh Werkzeugaufnahmevorrichtung
EP2889092A1 (de) * 2013-12-24 2015-07-01 Amada Co., Ltd. Zwischenplattenmontagevorrichtung einer Abkantpresse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506538A (en) * 1983-09-21 1985-03-26 Niagara Machine & Tool Works Punch-clamping construction for presses
US4895014A (en) * 1986-08-28 1990-01-23 Houston David L Failsafe tool clamping system for press brake
EP0754506A2 (de) * 1995-07-17 1997-01-22 ABIEMME S.r.L. Druckluftsystem für Ein- und Ausspannvorrichtung von Gesimsbiegewerkzeugen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506538A (en) * 1983-09-21 1985-03-26 Niagara Machine & Tool Works Punch-clamping construction for presses
US4895014A (en) * 1986-08-28 1990-01-23 Houston David L Failsafe tool clamping system for press brake
EP0754506A2 (de) * 1995-07-17 1997-01-22 ABIEMME S.r.L. Druckluftsystem für Ein- und Ausspannvorrichtung von Gesimsbiegewerkzeugen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6395109B1 (en) 2000-02-15 2002-05-28 Cargill, Incorporated Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
WO2002013985A1 (de) * 2000-08-14 2002-02-21 Trumpf Maschinen Austria Gmbh & Co. Kg Werkzeugspannvorrichtung für ein formwerkzeug, insbesondere einer abkantpresse
US6782729B2 (en) 2000-08-14 2004-08-31 Trumpf Maschinen Austria Gmbh & Co. Kg. Tool clamping device for shaping tool, especially for a press brake
AT414327B (de) * 2003-05-14 2007-09-15 Trumpf Maschinen Austria Gmbh Werkzeugaufnahmevorrichtung
EP2889092A1 (de) * 2013-12-24 2015-07-01 Amada Co., Ltd. Zwischenplattenmontagevorrichtung einer Abkantpresse

Also Published As

Publication number Publication date
EP0934782A3 (de) 2003-01-08
ITMI980155A1 (it) 1999-07-28
IT1298501B1 (it) 2000-01-12

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