EP1075880A1 - Biegepresse mit Unterbalken versehen mit Schlitzen - Google Patents

Biegepresse mit Unterbalken versehen mit Schlitzen Download PDF

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Publication number
EP1075880A1
EP1075880A1 EP00402207A EP00402207A EP1075880A1 EP 1075880 A1 EP1075880 A1 EP 1075880A1 EP 00402207 A EP00402207 A EP 00402207A EP 00402207 A EP00402207 A EP 00402207A EP 1075880 A1 EP1075880 A1 EP 1075880A1
Authority
EP
European Patent Office
Prior art keywords
plate
press brake
bore
sleeve
deck
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
EP00402207A
Other languages
English (en)
French (fr)
Other versions
EP1075880B1 (de
Inventor
Eric Gascoin
Olivier Bouchentouf
Koji Shima
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.)
Amada Europe SA
Amada Co Ltd
Original Assignee
Amada Europe SA
Amada Co Ltd
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 Amada Europe SA, Amada Co Ltd filed Critical Amada Europe SA
Publication of EP1075880A1 publication Critical patent/EP1075880A1/de
Application granted granted Critical
Publication of EP1075880B1 publication Critical patent/EP1075880B1/de
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
    • B21D5/0272—Deflection compensating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/701—Preventing distortion

Definitions

  • the invention relates to a press brake for folding metal sheets of the type having an upper deck arranged above a lower deck, one of these decks being fixed in support on its ends while the other deck is movable and actuated in a vertical plane by drive members also located at its two ends, the fixed apron being constituted by a plate having a demarcated upper part and lower part by two symmetrically identical slots with respect to the plane transverse median of said fixed apron, each slot being defined by an upper wall and a lower wall connected by a bottom, and opening through an opening on the corresponding lateral edge of said plate.
  • Japanese utility model 2,558,928 describes a press brake of this type, in which the working edges of the upper apron and the lower apron deform along lines of curvature longitudinal arched up under the action of bending forces exercised by the drive bodies, and taken up by the supports end of the lower part of the plate.
  • the lateral ends of the part top approach the side ends of the part lower.
  • the upper walls of the slots are near the bottom walls of the slots, and the bottom region of the slots is subject to considerable and repeated stresses which can irreparably degrade the intrinsic elasticity of the upper part of the lower deck.
  • This Japanese utility model also indicates that the slots are each provided with a movable member whose position is adjustable manually or automatically, inside the slots.
  • This movable member is directly in contact with the walls lower and upper of the corresponding slot and its displacement virtually limits the depth of said slot and therefore to decrease, as the movable member approaches the opening, the elasticity of the lower deck.
  • This movable member makes it possible to adjust the elasticity of the deck lower depending on the bending forces to be exerted on a part, so that the lines of curvature of the two working edges of the aprons upper and lower are as parallel as possible.
  • each slot is generally formed by a wall curve whose ends are tangentially connected respectively to the upper wall and to the lower wall. If these the latter are substantially parallel, the curved wall is semi-circular, and if they are divergent towards the opening, the curved wall is in the form of a sector less than 180 °.
  • the constraints in the plate are important in the vicinity of this curved connecting surface, and peaks of stress in this area can lead to degradation irreversible and irreversible elasticity of the upper part of the lower apron.
  • the constraints in the bottom area are compression stresses. These constraints can turn into tensile stresses, when the organ mobile is placed near the bottom. These tensile stresses can cause cracks, when the radius of curvature of the bottom is small.
  • the object of the invention is to propose a press brake as mentioned in the introduction which can make a very large number of folding operations without risk of damage irreversible.
  • the invention achieves its object by the fact that the bottom of each slot is formed by the inner wall of a through bore in the plate, said internal wall extending over an angle close to 360 ° to distribute the stresses due to bending over a large area.
  • the zone subjected to strong constraints of the press brake according to the invention is at least equal to double the area of heavy constraints of current press brakes.
  • the point constraints are thus reduced, and there are less chances of obtaining destructive point stress peaks.
  • the safety stops limiting the relative movement of the ends of the upper part relative to the lower part of the lower deck, the bending forces greater than the nominal forces which cause the support of the ends of the upper part on the stops, will not cause additional constraints in the region of background.
  • the plate is reinforced in the region of each bottom by at least one side plywood having a cut following the outline of the bottom and the slot.
  • a plywood is arranged on each side of the plate in the region of each bottom.
  • a sleeve is mounted tightened in each bore, said sleeve being intended to distribute the folding stresses in the regions of the plate surrounding said bore.
  • Figures 1 and 2 show a press brake according to the invention.
  • This press brake has an upper deck 1 and a lower apron 2 mounted in a frame formed by two flanges 9a and 9b joined together, in particular by a bracing beam not shown in the drawing.
  • the upper 1 and lower 2 aprons are contained in a same vertical plane and the upper deck 1 slides in relation to flanges 9a and 9b using guide means 8a and 8b constituted by example by two hydraulic cylinders.
  • the bending angle of a metal sheet or sheet depends on the importance of the penetration of the punch P inside the die M, and therefore, to obtain a constant angle bend on the entire length of the fold, it is necessary that this penetration is the even over the entire length.
  • the lower apron 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical with respect to the plane median transverse of the lower deck 2, represented in FIG. 1 by section line II-II.
  • Each slot 3a and 3b extends substantially in one direction inclined starting from the lower central zone of the plate towards the upper lateral end of the plate.
  • Each slot 3a and 3b is delimited by an upper wall 3 la and 31b and a lower wall 32a and 32b which are substantially parallel to each other, and open out on the lateral face 40a, 40b of the plate through an opening 41a, 41b in which a safety stop 42a, 42b is provided which will be described later.
  • Each slot 3a and 3b further comprises a bottom 33a and 33b which connects the upper walls 3a and 31b and lower 32a and 32b to the level of the central zone of the lower deck 2.
  • the lower deck 2 comprises an upper part 22 and a lower part 21 situated respectively above and below of the two slots 3a and 3b.
  • the lower part 21 of the lower apron 2 is fixed at its ends to the flanges 9a and 9b forming the frame of the press brake.
  • the fixing of the lower part 21 can be produced by welding or by any other means.
  • the upper part 22 of the lower deck 2 is, in turn, connected to the lower part 21 only by the central zone of the plate located between the two bottoms 33a and 33b of said slots 3a and 3b.
  • the upper part 22 of the lower deck 2 thus has a degree of freedom in the vertical plane, thanks to which its ends free can be moved vertically from the ends fixed of the lower part 21, when it is subjected to stresses folding, which creates stresses in the plate made of lower deck 2, in particular in the areas around the bottoms 33a and 33b.
  • these latter each consist of the wall internal of a through bore 34a and 34b formed in the plate, said internal wall extending over an angle close to 360 ° and being connected at its ends to two connecting walls 35a and 35b substantially parallel and narrowly spaced, directed towards the center of bore 34a and 34b and connected to curved walls 36a and 36b extending respectively the upper walls 31a and 31b and lower 32a and 32b.
  • the diameter of the bore 34a and 34b is independent of the distance between the upper walls 3a and 31b and lower 32a and 32b. This diameter is dimensioned by calculation and optimized as a result of measurements made using strain gauges.
  • the bores 34a and 34b are machined with precision, so that the state of surface of their internal wall eliminates the risk of crack initiation.
  • the lower part 21 and the upper part 22 of the deck 2 have teeth 37a and 37b, terminated by the connecting walls 35a, 35b spaced by a distance e, and which extend over a length L clearly greater than the distance e.
  • FIGS 4 and 5 show the arrangement of the safety stops 42a and 42b in the openings 41a and 41b of the slots 3a and 3b.
  • Each opening 41a and 41b is delimited by the underside 43a of the lateral end of the upper part 22 of the lower deck 2 and by the upper face 44a of a safety stop 42a and 42b fixed in the upper region of the lateral end of the lower part 21 of the lower deck 2.
  • the faces 43a and 44a are mutually parallel and spaced by a distance J. This distance J decreases when applying bending forces and cancels when the forces reach the force nominal press brake.
  • the stops 42a and 42b directly transmit the overload at the lower part 21 of the lower deck 2, which limits the constraints in the areas of funds 33a and 33b at values of nominal constraints.
  • reinforcements 50a are provided and 50b near funds 33a and 33b.
  • these reinforcements 50a and 50b are in the form of plywoods arranged on either side of the veil of the lower deck 2 and each having a cut following the outline of the bottoms 33a and 33b and slots 3a and 3b.
  • Plywood 50a and 50b are joined to the veil of the lower apron 2 by welding or by any other suitable means.
  • the area annular 51 delimited by a dashed line in FIG. 6, does not include no weld seam, to avoid tensions in this area due to welding.
  • a sleeve 60 is mounted tight in each of these bores, as well as this is shown in Figures 8 to 10.
  • the sleeve 60 has undergone prior to heat treatment and surface treatment aimed at improving its coefficient of friction, in order to avoid any degradation due to the phenomenon of corrosion of the surfaces in contact.
  • FIGS. 11 and 12 show the graph G 1 of the stresses around the bore 34a during a folding operation, in the absence of sleeve 60. This graph G 1 presents a significant stress peak.
  • FIG. 13 shows the graph G 2 of the stresses when the bore 34a comprises a sleeve 60.
  • the sleeve 60 can be made in full or hollow section. In the case where the veil of the lower apron 2 is reinforced by plywoods 50a and 50b, the sleeve 60 is tightened both in the bore 34a and 34b and in the corresponding openings of the plywoods 50a and 50b.
  • the sleeve 60 shown in Figures 9 and 10 is cylindrical and has a diameter adapted to that of the bores 34a and 34b. But the difference in precision of the diameter of the bores 34a and 34b and of the sleeve diameter 60 may affect the accuracy of folding.
  • FIG. 14 shows an alternative embodiment of the sleeve 60.
  • the bores 34a, 34b and the sleeve 60 are machined so that they have a conical shape with the same inclination.
  • the sleeve 60 is held in its bore by a plate 61 fixed by bolts 62 on one side of the deck around the most large opening of the bore.
  • a plate 63 made of material elastic, such as polyurethane, is interposed between the plate 61 and the end face of the sleeve 60. This plate 63 made of material elastic also eliminates the play between the sleeve 60 and the inner wall of the bore.
  • the apron lower is fixed and the upper deck is movable.
  • the invention is not not limit to these embodiments and also relates to press brakes in which the upper deck is fixed and the lower deck is movable.
  • the slots 3a and 3b are formed in the fixed upper apron.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Forging (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP00402207A 1999-08-09 2000-08-02 Biegepresse mit Unterbalken versehen mit Schlitzen Expired - Lifetime EP1075880B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9910315 1999-08-09
FR9910315A FR2797407B1 (fr) 1999-08-09 1999-08-09 Presse plieuse a tablier inferieur muni de fentes

Publications (2)

Publication Number Publication Date
EP1075880A1 true EP1075880A1 (de) 2001-02-14
EP1075880B1 EP1075880B1 (de) 2003-10-08

Family

ID=9549018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00402207A Expired - Lifetime EP1075880B1 (de) 1999-08-09 2000-08-02 Biegepresse mit Unterbalken versehen mit Schlitzen

Country Status (6)

Country Link
US (1) US6374658B1 (de)
EP (1) EP1075880B1 (de)
JP (1) JP4676593B2 (de)
AT (1) ATE251510T1 (de)
DE (1) DE60005763T2 (de)
FR (1) FR2797407B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001043896A1 (de) * 1999-12-15 2001-06-21 Trumpf Maschinen Austria Gmbh & Co. Kg. Fertigungseinrichtung, insbesondere abkantpresse
CN101837393A (zh) * 2009-03-13 2010-09-22 阿玛达欧洲公司 用于折弯板材的压弯机
AT514080B1 (de) * 2013-05-10 2014-10-15 Trumpf Maschinen Austria Gmbh Vorrichtung und Verfahren zum Biegen von Blechen
WO2015081359A1 (de) * 2013-12-04 2015-06-11 Trumpf Maschinen Austria Gmbh & Co. Kg. Biegemaschine

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20020904A1 (it) * 2002-10-17 2004-04-18 Alberto Arduino Pressa piegatrce con trave portautensile sostanzialmente
JP4630533B2 (ja) * 2002-10-23 2011-02-09 株式会社アマダ 曲げ加工機
NL1029177C2 (nl) * 2005-06-02 2006-12-05 Safan Bv Pers.
AT507412B1 (de) * 2008-10-15 2010-05-15 Trumpf Maschinen Austria Gmbh Biegepresse mit stützlagervorrichtung für antriebsmittel
FR2942982B1 (fr) * 2009-03-13 2014-12-05 Amada Europ Presse plieuse pour le pliage de feuilles
FR2942981B1 (fr) * 2009-03-13 2011-04-08 Amada Europe Presse plieuse pour le pliage de feuilles
ITMI20110977A1 (it) 2011-05-30 2012-12-01 Finn Power Italia S R L Pressa piegatrice
JP6058428B2 (ja) * 2013-03-04 2017-01-11 大生熔接工業株式会社 金型取り付け部材の強化方法
JP7369636B2 (ja) * 2020-02-17 2023-10-26 株式会社アマダ プレスブレーキ及び曲げ加工方法
EP4074432A1 (de) * 2021-04-15 2022-10-19 Bystronic Laser AG Biegemaschine zur biegung von werkstücken, insbesondere abkantpresse

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2317832A1 (de) * 1973-04-09 1974-10-17 Mengele & Soehne Masch Karl Abkantpresse und dergleichen
JP2558928Y2 (ja) * 1991-11-26 1998-01-14 株式会社アマダ プレスブレーキ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2119528A5 (de) * 1970-12-25 1972-08-04 Amada Co Ltd
DE4138286A1 (de) * 1991-11-21 1993-05-27 M & S Brugg Ag Presse
JP2000343125A (ja) * 1999-05-28 2000-12-12 Amada Co Ltd プレスブレーキ
JP2001121214A (ja) * 1999-10-27 2001-05-08 Amada Co Ltd プレスブレーキのクラウニング装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2317832A1 (de) * 1973-04-09 1974-10-17 Mengele & Soehne Masch Karl Abkantpresse und dergleichen
JP2558928Y2 (ja) * 1991-11-26 1998-01-14 株式会社アマダ プレスブレーキ

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001043896A1 (de) * 1999-12-15 2001-06-21 Trumpf Maschinen Austria Gmbh & Co. Kg. Fertigungseinrichtung, insbesondere abkantpresse
CN101837393A (zh) * 2009-03-13 2010-09-22 阿玛达欧洲公司 用于折弯板材的压弯机
ES2382287A1 (es) * 2009-03-13 2012-06-07 Amada Europe Prensa plegadora para el plegado de laminas.
CN101837393B (zh) * 2009-03-13 2012-11-14 株式会社天田 用于折弯板材的压弯机
CN102861795A (zh) * 2009-03-13 2013-01-09 株式会社天田 用于折弯板材的压弯机
CN102861795B (zh) * 2009-03-13 2014-12-03 株式会社天田 用于折弯板材的压弯机
AT514080B1 (de) * 2013-05-10 2014-10-15 Trumpf Maschinen Austria Gmbh Vorrichtung und Verfahren zum Biegen von Blechen
AT514080A4 (de) * 2013-05-10 2014-10-15 Trumpf Maschinen Austria Gmbh Vorrichtung und Verfahren zum Biegen von Blechen
WO2015081359A1 (de) * 2013-12-04 2015-06-11 Trumpf Maschinen Austria Gmbh & Co. Kg. Biegemaschine

Also Published As

Publication number Publication date
JP2001071033A (ja) 2001-03-21
DE60005763D1 (de) 2003-11-13
EP1075880B1 (de) 2003-10-08
ATE251510T1 (de) 2003-10-15
FR2797407B1 (fr) 2001-11-02
JP4676593B2 (ja) 2011-04-27
US6374658B1 (en) 2002-04-23
DE60005763T2 (de) 2004-08-05
FR2797407A1 (fr) 2001-02-16

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