EP0490828A1 - A sheet-metal bending machine - Google Patents

A sheet-metal bending machine Download PDF

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Publication number
EP0490828A1
EP0490828A1 EP91830514A EP91830514A EP0490828A1 EP 0490828 A1 EP0490828 A1 EP 0490828A1 EP 91830514 A EP91830514 A EP 91830514A EP 91830514 A EP91830514 A EP 91830514A EP 0490828 A1 EP0490828 A1 EP 0490828A1
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EP
European Patent Office
Prior art keywords
sheet
mobile frame
machine
mobile
pressing element
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
EP91830514A
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German (de)
French (fr)
Other versions
EP0490828B1 (en
Inventor
Luigi Patuzzi
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.)
SAMAT Srl
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SAMAT Srl
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Publication date
Application filed by SAMAT Srl filed Critical SAMAT Srl
Publication of EP0490828A1 publication Critical patent/EP0490828A1/en
Application granted granted Critical
Publication of EP0490828B1 publication Critical patent/EP0490828B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B21D5/045—With a wiping movement of the bending blade

Definitions

  • the invention relates to a sheet-metal bending machine.
  • the machine is best applied in the bending of metal sheets of differing thicknesses, of satin-finish stainless steel, or prepainted sheets, or plasticated sheets and so on, which are destined for widely differing uses, such as, for example , in the construction of metallic furniture, the cases of household electrical appliances, shelves, etc., in which the bending zones of the sheet, the paint or the protective layer must be without defects.
  • the prior art embraces sheet-metal bending machines of different types able to avoid the formation of defects in the bending zone.
  • Said machines comprises a fixed supporting structure having two pressing elements: one fixed lower element, on which the sheet to be bent is placed, and one mobile upper element, which keeps the sheet pressed on to the lower element.
  • a mobile frame having a substantially c-shaped transversal section, is associated with the fixed element, which frame has two blades, one upper and one lower, which blades, following the raising or lowering of the mobile frame effect the bending of the sheet.
  • the prior art embraces a first type of machine in which said movement is realised by means of the use of manual adjustment systems.
  • the well-known drawback of these machines is constituted by the fact that correct execution of the bending depends largely on the operator's ability.
  • the prior art embraces also a second type of machine, in which the bending blade's movement away from and towards the sheet is executed envisaging that the blades should be moved singly. That, as is well known, considerably complicates the machine from the point of view of construction. The machine also becomes extremely complex and expensive and difficult to control in that there are two movement directions to manage (one for each bending blade).
  • the prior art also embraces a third type, in which the movement towards and away from the blade is made by the entire mobile frame.
  • the movement system in this case is cosntituted by hydraulic cylinders.
  • the well-known drawback of such machines is that the hydraulic cylinders cannot carry out micrometric movements with great accuracy. In pratice, therefore, the positioning of the mobile frame carrying the two blades is insufficiently precise and furthermore is difficult to manage.
  • the principal aim of the present invention is therefore that of overcoming the above-cited drawback relative to prior art machines, and of providing a sheet-metal bending machine capable of operating on sheets of different thicknesses, avoiding the formation of defects in the bending zones, and of realising bending angles with the possibility of rounding them: said machine is extremely simple from the point of view of construction, extremely precise, reliable and easy to manage from the operative point of view, and can be operated automatically.
  • the machine in question comprising essentially a fixed support structure having a lower pressing element, on which the sheet to be bent is placed, to which lower element a mobile upper pressing element is associated which upper element presses the sheet to be bent against said lower element, said upper pressing element being supported by a mobile structure, said machine further comprising a mobile frame, borne by said support structure, having a substantially c-shaped transversal section bearing an upper blade and a lower blade, said blades effecting the bending of the sheet while said mobile frame is raised and lowered, activating means being envisaged to effect said raising and lowering of said mobile frame, said mobile frame being furthermore able to slide from and towards the sheet to be bent by means of an activating system, wherein said activating system comprises at leats one cam device to which a connecting element to said mobile frame is solidly fixed, said said cam device being mounted on a shaft able to perform rotations in both directions with excursions determined by pre-established operative phases.
  • a support structure 1 has internally a chamber 2.
  • the support structure 1 has a lower pressing element 3 on which the sheet 4 to be bent is placed, to which lower pressing element 3 a mobile upper pressing element 5 is associated which presses the sheet against the lower pressing element 3.
  • the upper pressing element 5 is borne by a mobile structure, hinged 7 to the support structure 1, which support structure 1 is able to perform vertical-plane oscillations by the activating of at least one double-acting hydraulic cylinder 8 which is fixed respectively to the mobile structure 6 and to the support structure 1.
  • a mobile frame 9 Inside the chamber 2 a mobile frame 9 is housed, having a substantially c-shaped transversal section, and bearing an upper blade 10 and a lower blade 11.
  • the blades 10 and 11 effect the bending of the sheet 4 when the mobile frame 9 is raised or lowered: the blade 10 or the blade 11 interferes with the sheet 4 in proximity to the zone where it exits from the pressing elements 3 and 5, effecting thus the bending: the upper blade 10 effects the downwards bending, while the lower blade 11 performs the upwards bending.
  • the raising and lowering of the mobile frame 9 is performed by at least one double-acting hydraulic cylinder 12 constrained to the mobile frame 9 and to the support structure 1.
  • Said activating system comprises at leats one cam device 14, formed by a plate element 15 splined on the shaft 13, to which shaft 13 a connecting element 16 to the mobile frame 9 is solidly fixed.
  • the mobile frame 9 is thus pivoted on the shaft 13 by the cam device 14.
  • the shaft 13, activated by known means, is able to perform rotations in both directions with excursions determined by pre-established operative phases for example, 100° in one direction and 100° in the opposite direction) controlled by a computer (not in the figures).
  • Said computer furthermore manages all the other movements of the machine, permitting of a programmable funtioning, according to the operative requirements , which is completely automatic.
  • the invention therefore attains the pre-established aims.

Abstract

The present invention relates to a sheet-metal bending machine. It comprises a fixed support structure (1) bearing a lower pressing element (3) on which the sheet (4) to be bent is placed and to which lower pressing element (3) a mobile upper pressing element (5) is associated; the machine also comprises a mobile frame (9) bearing a lower blade (11) and an upper blade (10). Said blades (10) and (11) perform the bending of the sheet (4) when the mobile frame (9) is raised or lowered. The mobile frame (9) is furthermore able to slide away from and towards the said sheet (4) by means of an activating system comprising at least one cam device (14), to which a connecting element (16) with the mobile frame (9) is solidly fixed, which cam device (14) is able to rotate in both directions according to pre-established and automated operative phases.

Description

  • The invention relates to a sheet-metal bending machine.
  • In particular, the machine is best applied in the bending of metal sheets of differing thicknesses, of satin-finish stainless steel, or prepainted sheets, or plasticated sheets and so on, which are destined for widely differing uses, such as, for example , in the construction of metallic furniture, the cases of household electrical appliances, shelves, etc., in which the bending zones of the sheet, the paint or the protective layer must be without defects.
  • The prior art embraces sheet-metal bending machines of different types able to avoid the formation of defects in the bending zone.
  • Said machines comprises a fixed suporting structure having two pressing elements: one fixed lower element, on which the sheet to be bent is placed, and one mobile upper element, which keeps the sheet pressed on to the lower element. A mobile frame, having a substantially c-shaped transversal section, is associated with the fixed element, which frame has two blades, one upper and one lower, which blades, following the raising or lowering of the mobile frame effect the bending of the sheet.
  • To avoid the formation of defects in the bending zone, and in order to be able to carry out bendings with different angles as well as roundings of the said bending angles, a movement of the mobile frame is envisaged, both away from and towards the sheet to be bent.
  • The prior art embraces a first type of machine in which said movement is realised by means of the use of manual adjustment systems. The well-known drawback of these machines is constituted by the fact that correct execution of the bending depends largely on the operator's ability.
  • The prior art embraces also a second type of machine, in which the bending blade's movement away from and towards the sheet is executed envisaging that the blades should be moved singly. That, as is well known, considerably complicates the machine from the point of view of construction. The machine also becomes extremely complex and expensive and difficult to control in that there are two movement directions to manage (one for each bending blade).
  • The prior art also embraces a third type, in which the movement towards and away from the blade is made by the entire mobile frame. The movement system in this case is cosntituted by hydraulic cylinders. The well-known drawback of such machines is that the hydraulic cylinders cannot carry out micrometric movements with great accuracy. In pratice, therefore, the positioning of the mobile frame carrying the two blades is insufficiently precise and furthermore is difficult to manage.
  • The principal aim of the present invention is therefore that of overcoming the above-cited drawback relative to prior art machines, and of providing a sheet-metal bending machine capable of operating on sheets of different thicknesses, avoiding the formation of defects in the bending zones, and of realising bending angles with the possibility of rounding them: said machine is extremely simple from the point of view of construction, extremely precise, reliable and easy to manage from the operative point of view, and can be operated automatically.
  • The aim and others besides are attained by the machine in question, comprising essentially a fixed support structure having a lower pressing element, on which the sheet to be bent is placed, to which lower element a mobile upper pressing element is associated which upper element presses the sheet to be bent against said lower element, said upper pressing element being supported by a mobile structure, said machine further comprising a mobile frame, borne by said support structure, having a substantially c-shaped transversal section bearing an upper blade and a lower blade, said blades effecting the bending of the sheet while said mobile frame is raised and lowered, activating means being envisaged to effect said raising and lowering of said mobile frame, said mobile frame being furthermore able to slide from and towards the sheet to be bent by means of an activating system, wherein said activating system comprises at leats one cam device to which a connecting element to said mobile frame is solidly fixed, said said cam device being mounted on a shaft able to perform rotations in both directions with excursions determined by pre-established operative phases.
  • Further characteristics and advantages of the invention will better emerge from the detailed description which follows, of a preferred but not exclusive embodiment herein illustrated purely in the form of a non-limiting example in the drawings, in which:
    • Figure 1 shows schematically and in side view the present invention without its side-cover;
    • Figure 2 shows schematically, in isometric projection, the posterior part of the machine with several parts taken away;
    • Figures 3, 4, 5, and 6 show schematically four bending phases of the sheet effected by the lower blade.
  • With reference to the drawings, a support structure 1 has internally a chamber 2. The support structure 1 has a lower pressing element 3 on which the sheet 4 to be bent is placed, to which lower pressing element 3 a mobile upper pressing element 5 is associated which presses the sheet against the lower pressing element 3.
  • The upper pressing element 5 is borne by a mobile structure, hinged 7 to the support structure 1, which support structure 1 is able to perform vertical-plane oscillations by the activating of at least one double-acting hydraulic cylinder 8 which is fixed respectively to the mobile structure 6 and to the support structure 1.
  • Inside the chamber 2 a mobile frame 9 is housed, having a substantially c-shaped transversal section, and bearing an upper blade 10 and a lower blade 11.
  • The blades 10 and 11 effect the bending of the sheet 4 when the mobile frame 9 is raised or lowered: the blade 10 or the blade 11 interferes with the sheet 4 in proximity to the zone where it exits from the pressing elements 3 and 5, effecting thus the bending: the upper blade 10 effects the downwards bending, while the lower blade 11 performs the upwards bending.
  • The raising and lowering of the mobile frame 9 is performed by at least one double-acting hydraulic cylinder 12 constrained to the mobile frame 9 and to the support structure 1.
  • The mobile frame 9, which is pivoted on a shaft 13 positioned in the posterior part of the support structure 1, is also able to slide horizontally away from and towards the sheet 4 by means of a particular activating system. Said activating system comprises at leats one cam device 14, formed by a plate element 15 splined on the shaft 13, to which shaft 13 a connecting element 16 to the mobile frame 9 is solidly fixed.
  • The mobile frame 9 is thus pivoted on the shaft 13 by the cam device 14.
  • The shaft 13, activated by known means, is able to perform rotations in both directions with excursions determined by pre-established operative phases for example, 100° in one direction and 100° in the opposite direction) controlled by a computer (not in the figures).
  • Said computer furthermore manages all the other movements of the machine, permitting of a programmable funtioning, according to the operative requirements , which is completely automatic.
  • In figures 3, 4, 5,and 6 four phases of bending of the sheet 4 are illustrated by way of example.
  • In fig. 3 the moment of positioning of the blade 11 in relation to the sheet 4 is represented.
  • In fig. 4 the vertical activating of the blade 11 is represented, bringing about the formation of a bend greater than 90°.
  • In fig. 5 the horizontal activating of the blade 11 is represented (produced by the rotation of the shaft 13 and consequently of the cam device 14) bringing about the formation of a bend with a 90° angle.
  • In fig. 6 a further horizontal displacement of the blade 11 is represented , bringing about the formation of a bend with an angle of less than 90°.
  • It is notable that form the point of view of construction and functioning the present machine is very simple, and as a result of this will be very economical to run, and will cause few operative problems.
  • The invention therefore attains the pre-established aims.

Claims (4)

  1. A sheet-metal bending machine, comprising essentially a fixed support structure (1) bearing a lower pressing element (3) on which element (3) a sheet (4) to be pressed is placed, to which element (3) a mobile upper pressing element (5) is associated, which upper pressing element (5) presses the sheet (4) to be bent against said lower pressing element (3), said upper pressing element (5) being borne by a mobile strucutre (6); said machine further comprising a mobile frame (9), borne by said support structure (1), having a substantially c-shaped transversal section, bearing an upper blade (10) and a lower blade (11), said blades (10) and (11) effecting the bending of the sheet (4) when said mobile frame (9) is raised or lowered; means of activation (12) being envisaged to effect the raising or lowering of said mobile frame (9), said mobile frame (9) being furthermore able to slide away from and towards the said sheet (4) by means of an activating system; wherein said activating system comprises at least one cam device (14) to which device (14) is solidly fixed a connecting element (16) with said mobile frame (9), which cam device (14) is mounted on a shaft (13) able to rotate in both directions with excursions determined by pre-established operative phases.
  2. A machine as in claim 1, wherein said mobile frame (9) is pivoted on said shaft (13) at the position of said cam device (14).
  3. A machine as in claim 1, wherein said cam device (14) comprises a plate element (15) splined on said shaft (13).
  4. A machine as in claim 1, wherein said activating means (12) envisaged for the effecting of the raising and lowering of the said mobile frame (9) comprise at least one double-acting hydraulic cylinder (12) constrained respectively to said mobile frame (9) and to said fixed support structure (1).
EP91830514A 1990-12-07 1991-11-25 A sheet-metal bending machine Expired - Lifetime EP0490828B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT08501990A IT1242874B (en) 1990-12-07 1990-12-07 MACHINE FOR BENDING SHEETS
IT8501990 1990-12-07

Publications (2)

Publication Number Publication Date
EP0490828A1 true EP0490828A1 (en) 1992-06-17
EP0490828B1 EP0490828B1 (en) 1995-02-01

Family

ID=11326929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91830514A Expired - Lifetime EP0490828B1 (en) 1990-12-07 1991-11-25 A sheet-metal bending machine

Country Status (6)

Country Link
EP (1) EP0490828B1 (en)
JP (1) JPH05115924A (en)
AT (1) ATE117922T1 (en)
DE (1) DE69107185T2 (en)
ES (1) ES2070477T3 (en)
IT (1) IT1242874B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2063658A2 (en) * 1992-09-21 1995-01-01 Goiti S Coop Ltda Improved machine for folding sheet metal
WO1996004084A1 (en) * 1994-07-29 1996-02-15 Sapim Amada S.P.A. Bending press for sheet metal
WO1996024446A1 (en) * 1995-02-06 1996-08-15 Amada Company, Ltd. Bending apparatus for metal sheets
EP0742055A1 (en) * 1995-05-11 1996-11-13 SAMAT S.r.l. A sheet-metal bending, profiling and cutting machine
NL1000459C2 (en) * 1995-05-31 1996-12-03 Cornelis Hendricus Liet Device for bending metal sheet
EP0745442A1 (en) * 1995-05-31 1996-12-04 Cornelis Hendricus Liet Apparatus for bending metal sheet
WO2006042975A1 (en) * 2004-10-21 2006-04-27 Arcelor Steel Service Centres Device and folding system for a blank
WO2007107623A1 (en) * 2006-03-20 2007-09-27 Iprbox Oy Method and apparatus for plate bending
WO2008074775A1 (en) * 2006-12-19 2008-06-26 Gm Global Technology Operations, Inc. Folding device, and method for folding workpieces
ITPD20100372A1 (en) * 2010-12-10 2012-06-11 Xp Technology S R L PANEL MACHINE TOOL MACHINE WITH IMPROVED HANDLING OF THE PRE-EMPTYING DEVICE AND THE DISHWASHER DEVICE

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2004216A (en) * 1977-09-19 1979-03-28 Salvagnini Transferica Spa Machine for bending the edges of rectangular sheets of metal
EP0022122A1 (en) * 1979-06-20 1981-01-07 VOEST-ALPINE Aktiengesellschaft Bending machine
EP0023894A1 (en) * 1979-08-02 1981-02-11 SALVAGNINI TRANSFERICA S.p.A. Forming press for making perimetral bends on metal sheets
EP0077314A1 (en) * 1981-10-09 1983-04-20 VOEST-ALPINE Aktiengesellschaft Folding device for a sheet-metal plate
US4722214A (en) * 1985-03-12 1988-02-02 Murata Kikai Kabushiki Kaisha Split die for holding work during bending operation
EP0293964A2 (en) * 1987-06-03 1988-12-07 SALVAGNINI S.p.A. Bending machine for sheet metal panels having a blank holder with uniform compression
EP0298056A2 (en) * 1987-07-03 1989-01-04 Antonio Codatto Bending press for sheets
EP0353680A2 (en) * 1988-08-03 1990-02-07 Rolf Nagel Apparatus for producing plate flanges by bending

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2004216A (en) * 1977-09-19 1979-03-28 Salvagnini Transferica Spa Machine for bending the edges of rectangular sheets of metal
EP0022122A1 (en) * 1979-06-20 1981-01-07 VOEST-ALPINE Aktiengesellschaft Bending machine
EP0023894A1 (en) * 1979-08-02 1981-02-11 SALVAGNINI TRANSFERICA S.p.A. Forming press for making perimetral bends on metal sheets
EP0077314A1 (en) * 1981-10-09 1983-04-20 VOEST-ALPINE Aktiengesellschaft Folding device for a sheet-metal plate
US4722214A (en) * 1985-03-12 1988-02-02 Murata Kikai Kabushiki Kaisha Split die for holding work during bending operation
EP0293964A2 (en) * 1987-06-03 1988-12-07 SALVAGNINI S.p.A. Bending machine for sheet metal panels having a blank holder with uniform compression
EP0298056A2 (en) * 1987-07-03 1989-01-04 Antonio Codatto Bending press for sheets
EP0353680A2 (en) * 1988-08-03 1990-02-07 Rolf Nagel Apparatus for producing plate flanges by bending

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 299 (M-524)(2355) 11 October 1986 & JP-A-61 111 736 ( MARU KIKAI KOGYO K.K. ) 29 May 1986 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2063658A2 (en) * 1992-09-21 1995-01-01 Goiti S Coop Ltda Improved machine for folding sheet metal
WO1996004084A1 (en) * 1994-07-29 1996-02-15 Sapim Amada S.P.A. Bending press for sheet metal
US5765427A (en) * 1994-07-29 1998-06-16 Codatto; Antonio Bending press for sheet metal
WO1996024446A1 (en) * 1995-02-06 1996-08-15 Amada Company, Ltd. Bending apparatus for metal sheets
EP0742055A1 (en) * 1995-05-11 1996-11-13 SAMAT S.r.l. A sheet-metal bending, profiling and cutting machine
NL1000459C2 (en) * 1995-05-31 1996-12-03 Cornelis Hendricus Liet Device for bending metal sheet
EP0745442A1 (en) * 1995-05-31 1996-12-04 Cornelis Hendricus Liet Apparatus for bending metal sheet
US5743128A (en) * 1995-05-31 1998-04-28 Liet; Cornelis Hendricus Apparatus for bending metal sheet
WO2006042975A1 (en) * 2004-10-21 2006-04-27 Arcelor Steel Service Centres Device and folding system for a blank
FR2876926A1 (en) * 2004-10-21 2006-04-28 Jean Claude Jeandeaud DEVICE AND INSTALLATION FOR FOLDING A FLAN
WO2007107623A1 (en) * 2006-03-20 2007-09-27 Iprbox Oy Method and apparatus for plate bending
WO2008074775A1 (en) * 2006-12-19 2008-06-26 Gm Global Technology Operations, Inc. Folding device, and method for folding workpieces
GB2457846A (en) * 2006-12-19 2009-09-02 Gm Global Tech Operations Inc Folding device and method for folding workpieces
GB2457846B (en) * 2006-12-19 2011-03-09 Gm Global Tech Operations Inc Folding device and method for folding of workpieces
US8375763B2 (en) 2006-12-19 2013-02-19 GM Global Technology Operations LLC Folding device and method for the folding of workpieces
ITPD20100372A1 (en) * 2010-12-10 2012-06-11 Xp Technology S R L PANEL MACHINE TOOL MACHINE WITH IMPROVED HANDLING OF THE PRE-EMPTYING DEVICE AND THE DISHWASHER DEVICE
EP2463038A1 (en) * 2010-12-10 2012-06-13 XP Technology S.r.l. Panel-bending machine tool with improved movement of the sheet-pressing device and of the blade-holder device
WO2012077047A1 (en) * 2010-12-10 2012-06-14 Xp Technology S.R.L. Panel-bending machine tool with improved movement of the sheet-pressing device and of the blade-holder device

Also Published As

Publication number Publication date
DE69107185T2 (en) 1995-09-07
JPH05115924A (en) 1993-05-14
IT1242874B (en) 1994-05-18
EP0490828B1 (en) 1995-02-01
DE69107185D1 (en) 1995-03-16
ATE117922T1 (en) 1995-02-15
ES2070477T3 (en) 1995-06-01
IT9085019A0 (en) 1990-12-07
IT9085019A1 (en) 1992-06-08

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