EP1075880B1 - Presse plieuse à tablier inférieur muni de fentes - Google Patents
Presse plieuse à tablier inférieur muni de fentes Download PDFInfo
- Publication number
- EP1075880B1 EP1075880B1 EP00402207A EP00402207A EP1075880B1 EP 1075880 B1 EP1075880 B1 EP 1075880B1 EP 00402207 A EP00402207 A EP 00402207A EP 00402207 A EP00402207 A EP 00402207A EP 1075880 B1 EP1075880 B1 EP 1075880B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- bore
- fact
- wall
- sleeve
- 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.)
- Expired - Lifetime
Links
Images
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 the folding of metal sheets of the type comprising an upper apron arranged above a lower apron, one of these aprons being fixed in support on its ends while the other apron is movable and operated in a vertical plane by training members also located at both ends, the fixed deck being constituted by a plate having a delimited upper and lower part by two slots symmetrically identical to the plane medial cross-section of said fixed apron, each slot being defined by an upper wall and a bottom 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 deck and the lower apron deform along lines of curvature longitudinal arched upwards under the action of folding forces exercised by the driving organs, and taken up by the supports end of the lower part of the plate.
- the lateral ends of the part superior approach the lateral ends of the party lower.
- the upper walls of the slots are close the lower walls of the slots, and the bottom area of the slots is subject to considerable and repeated stresses that irreversibly degrade the intrinsic elasticity of the upper part of the lower apron.
- 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 mobile organ approaches the opening, the elasticity of the lower apron.
- This movable member makes it possible to adjust the elasticity of the apron lower according to the bending efforts to exert on a piece, so that the curvature lines of the two working edges of the aprons upper and lower are as parallel as possible.
- each slot is generally constituted by a wall curve whose ends are connected tangentially respectively to the upper wall and the lower wall. If these past are substantially parallel, the curved wall is semicircular, and if they are diverging 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 zone can lead to a deterioration irremediable and irreversible elasticity of the upper part of the lower apron.
- the constraints in the bottom area are compressive stresses. These constraints can be transformed 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 low.
- the object of the invention is to propose a press brake as mentioned in the introduction which can perform a very large number of folding operations without risk of damage irreversible.
- the invention achieves its goal by the fact that the bottom of each slot is formed by the inner wall of a through bore cut in the plate, said inner wall extending at an angle close to 360 ° in order to distribute the stresses due to bending on a more 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 strong constraints of the current press brakes. Point constraints are thus reduced, and there is less chances of obtaining point peaks destructive.
- the safety stops limiting the relative displacement of the ends of the upper part with respect to the lower part of the lower deck, the bending forces higher than the nominal forces which lead to the support of the ends of the upper part on the stops, will not result in 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 cutout conforming to the outline of the bottom and the slot.
- a counterplate is disposed of each side of the plate in the area of each bottom.
- a sleeve is mounted tightened in each bore, said sleeve being intended to distribute the bending 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 comprises an upper apron 1 and a lower apron 2 mounted in a frame formed of two flanges 9a and 9b joined together, in particular by a bracing beam not shown in the drawing.
- the upper aprons 1 and lower 2 are contained in a same vertical plane and the upper apron 1 slide relative to flanges 9a and 9b by means of guiding means 8a and 8b constituted by example by two hydraulic cylinders.
- the angle of folding of a metal sheet or sheet depends on the importance of punch P penetration inside the matrix M, and therefore, to get 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 deck 2 is constituted by a plate provided with two slots 3a and 3b symmetrically identical to the plane transverse center of the lower deck 2, shown in FIG. the section line II-II.
- Each slot 3a and 3b extends substantially in one direction tilted from the lower middle zone of the plate towards the upper lateral end of the plate.
- Each slot 3a and 3b is delimited by an upper wall 31a and 31b and a lower wall 32a and 32b which are substantially parallel to each other, and open on the lateral face 40a, 40b of the plate through an opening 41a, 41b in which there is provided a safety stop 42a, 42b which will be described later.
- Each slot 3a and 3b further comprises a bottom 33a and 33b which connects the upper walls 31a and 31b and lower 32a and 32b to level of the central area of the lower deck 2.
- the lower deck 2 comprises an upper portion 22 and a lower part 21 located respectively above and below two slots 3a and 3b.
- the lower part 21 of lower apron 2 is fixed at its ends to the flanges 9a and 9b forming the frame of the press brake. Fixing the lower part 21 can be performed by welding or by any other means.
- the upper part 22 of the lower deck 2 is, for its part, connected to the lower part 21 only by the central zone of the plate located between the two funds 33a and 33b of said slots 3a and 3b.
- the upper part 22 of the lower apron 2 thus has a degree of freedom in the vertical plane, thanks to which its extremities free can be moved vertically relative to the ends of the lower part 21 when subjected to folding, which generates constraints in the plate constituted by the lower apron 2, particularly in the areas surrounding the funds 33a and 33b.
- each of the 33a and 33b funds are each constituted by the wall internal of a through bore 34a and 34b formed in the plate, said inner wall extending at an angle close to 360 ° and being connected at its ends to two connecting walls 35a and 35b substantially parallel and slightly spaced, directed towards the center of the 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 separating the upper walls 31a and 31b and lower 32a and 32b. This diameter is dimensioned by calculation and optimized as a result measurements made by means of strain gauges.
- the bores 34a and 34b are machined precisely, so that the state of internal wall surface eliminates the risk of crack initiation.
- the lower part 21 and the upper part 22 of the apron 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 significantly 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 lower face 43a of the lateral end of the upper part 22 of the lower deck 2 and by the upper face 44a of a fixed safety stop 42a and 42b in the upper region of the lateral end of the lower part 21 of the lower deck 2.
- the faces 43a and 44a are parallel to each other and spaced apart a distance J. This distance J decreases when applying bending efforts and vanishes when efforts reach strength nominal of the press brake.
- the stops 42a and 42b directly transmit the overload at the lower part 21 of the lower deck 2, which limits constraints in the fund areas 33a and 33b at values of nominal constraints.
- reinforcements 50a and 50b near the bottoms 33a and 33b.
- these reinforcements 50a and 50b are in the form of plywood arranged on both sides of the veil of the lower deck 2 and which each have a cut-out conforming to the outline of the bottoms 33a and 33b and slots 3a and 3b.
- the 50a and 50b counterplates are secured to the veil of the lower deck 2 by welding or by any other suitable means.
- the zone ring 51 delimited by a dashed line in FIG. no weld bead, to avoid tensions in this area due to welding.
- a sleeve 60 is mounted tightly in each of these bores, as well as this is shown in FIGS. 8 to 10.
- the sleeve 60 has undergone previously a heat treatment and a surface treatment to improve its coefficient of friction, in order to avoid any degradation due to the phenomenon of corrosion of the faces 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 a sleeve 60.
- This graph G 1 has a large stress peak.
- FIG. 13 shows the graph G 2 of the stresses when the bore 34a comprises a sleeve 60.
- the sleeve 60 may be made in solid or hollow section. In the case where the veil of the lower deck 2 is reinforced by against the plates 50a and 50b, the sleeve 60 is tightened both in bore 34a and 34b and in the corresponding openings of plywoods 50a and 50b.
- the sleeve 60 shown in FIGS. 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 the sleeve diameter 60 can affect the accuracy of the bending.
- 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 apron around the most large opening of the bore.
- a wafer 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 of material elastically makes it possible to eliminate the clearance between the sleeve 60 and the inner wall of the bore.
- the apron lower is fixed and the upper apron is movable.
- the invention does not not limited to these embodiments and also relates to press brakes in which the upper apron is fixed and the lower apron is mobile.
- the slots 3a and 3b are arranged in the fixed upper deck.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Forging (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Description
Claims (7)
- Presse plieuse pour le pliage de feuilles métalliques, du type comportant un tablier supérieur (1) disposé au-dessus d'un tablier inférieur (2), l'un des tabliers (2) étant fixe en appui à ses extrémités, tandis que l'autre tablier (1) est mobile et actionné dans un plan vertical par des organes d'entraínement (8a, 8b) situés également à ses extrémités, le tablier fixe (2) étant constitué par une plaque comportant une partie supérieure (22) et une partie inférieure (21) délimitées par deux fentes symétriquement identiques par rapport au plan transversal médian dudit tablier fixe (2), chaque fente (3a, 3b) étant définie par une paroi supérieure (31a, 31b) et une paroi inférieure (32a, 32b) raccordées par un fond (33a, 33b) et débouchant par une ouverture (41a, 41b) sur le bord latéral correspondant de ladite plaque,
caractérisée par le fait que le fond (33a, 33b) de chaque fente (3a, 3b) est formé par la paroi interne d'un alésage (34a, 34b) traversant ménagé dans la plaque, ladite paroi interne s'étendant sur un angle proche de 360° afin de répartir les contraintes dues à la flexion sur une plus grande zone. - Presse plieuse selon la revendication 1, caractérisée par le fait que la paroi supérieure (31a, 31b) et la paroi inférieure (32a, 32b) sont sensiblement parallèles et se raccordent par des parois courbes (36a, 36b) à deux parois de liaison (35a, 35b) sensiblement parallèles et faiblement espacées, lesdites deux parois de liaison (35a, 35b) étant dirigées vers le centre de l'alésage (34a, 34b) et étant raccordées respectivement aux extrémités de la paroi interne de l'alésage (34a, 34b).
- Presse plieuse selon l'une des revendications 1 ou 2, caractérisée par le fait que la plaque est renforcée dans la région de chaque fond (33a, 33b) par au moins une contreplaque (50a, 50b) latérale présentant une découpe épousant le contour du fond (33a, 33b) et de la fente (3a, 3b).
- Presse plieuse selon la revendication 3, caractérisée par le fait qu'une contreplaque (50a, 50b) est disposée de chaque côté de la plaque dans la région de chaque fond (33a, 33b).
- Presse plieuse selon l'une quelconque des revendications 1 à 4, caractérisée par le fait qu'un manchon (60) est monté serré dans chaque alésage (34a, 34b), ledit manchon (60) étant destiné à répartir les contraintes de pliage dans les régions de la plaque entourant ledit alésage (34a, 34b).
- Presse plieuse selon la revendication 5, caractérisée par le fait que le manchon (60) et les alésages (34a, 34b) ont une forme conique avec la même inclinaison.
- Presse plieuse selon la revendication 6, caractérisée par le fait que le manchon (60) est maintenu dans son alésage (34a, 34b) par une plaque (61) avec interposition d'une plaquette (63) en matériau élastique.
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 EP1075880A1 (fr) | 2001-02-14 |
EP1075880B1 true EP1075880B1 (fr) | 2003-10-08 |
Family
ID=9549018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00402207A Expired - Lifetime EP1075880B1 (fr) | 1999-08-09 | 2000-08-02 | Presse plieuse à tablier inférieur muni de fentes |
Country Status (6)
Country | Link |
---|---|
US (1) | US6374658B1 (fr) |
EP (1) | EP1075880B1 (fr) |
JP (1) | JP4676593B2 (fr) |
AT (1) | ATE251510T1 (fr) |
DE (1) | DE60005763T2 (fr) |
FR (1) | FR2797407B1 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001043896A1 (fr) * | 1999-12-15 | 2001-06-21 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Equipement de fabrication, en particulier presse plieuse |
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 |
FR2942980B1 (fr) * | 2009-03-13 | 2011-04-08 | Amada Europ | Presse plieuse pour le pliage de feuilles |
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 |
AT514080B1 (de) * | 2013-05-10 | 2014-10-15 | Trumpf Maschinen Austria Gmbh | Vorrichtung und Verfahren zum Biegen von Blechen |
AT515153B1 (de) * | 2013-12-04 | 2015-08-15 | Trumpf Maschinen Austria Gmbh | Biegemaschine |
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 (fr) * | 2021-04-15 | 2022-10-19 | Bystronic Laser AG | Machine à plier permettant de plier des pièces, en particulier presse plieuse |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2119528A5 (fr) * | 1970-12-25 | 1972-08-04 | Amada Co Ltd | |
DE2317832C3 (de) * | 1973-04-09 | 1978-03-02 | Karl Mengele & Soehne Maschinenfabrik Und Eisengiesserei Guenzburg-Donau, 8870 Guenzburg | Abkantpresse und dergleichen |
DE4138286A1 (de) * | 1991-11-21 | 1993-05-27 | M & S Brugg Ag | Presse |
JP2558928Y2 (ja) * | 1991-11-26 | 1998-01-14 | 株式会社アマダ | プレスブレーキ |
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 |
-
1999
- 1999-08-09 FR FR9910315A patent/FR2797407B1/fr not_active Expired - Fee Related
-
2000
- 2000-07-31 US US09/629,896 patent/US6374658B1/en not_active Expired - Lifetime
- 2000-08-02 AT AT00402207T patent/ATE251510T1/de not_active IP Right Cessation
- 2000-08-02 EP EP00402207A patent/EP1075880B1/fr not_active Expired - Lifetime
- 2000-08-02 DE DE60005763T patent/DE60005763T2/de not_active Expired - Lifetime
- 2000-08-03 JP JP2000236173A patent/JP4676593B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE60005763T2 (de) | 2004-08-05 |
ATE251510T1 (de) | 2003-10-15 |
EP1075880A1 (fr) | 2001-02-14 |
JP2001071033A (ja) | 2001-03-21 |
FR2797407B1 (fr) | 2001-11-02 |
JP4676593B2 (ja) | 2011-04-27 |
US6374658B1 (en) | 2002-04-23 |
FR2797407A1 (fr) | 2001-02-16 |
DE60005763D1 (de) | 2003-11-13 |
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