EP0242309A1 - Bending press with pivoting beam - Google Patents
Bending press with pivoting beam Download PDFInfo
- Publication number
- EP0242309A1 EP0242309A1 EP87420097A EP87420097A EP0242309A1 EP 0242309 A1 EP0242309 A1 EP 0242309A1 EP 87420097 A EP87420097 A EP 87420097A EP 87420097 A EP87420097 A EP 87420097A EP 0242309 A1 EP0242309 A1 EP 0242309A1
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- EP
- European Patent Office
- Prior art keywords
- deck
- pins
- frame
- slides
- pivoting
- 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
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- 238000005452 bending Methods 0.000 title claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 230000003313 weakening effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- B21D5/04—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
- B21D5/042—With a rotational movement of the bending blade
Definitions
- the present invention relates to a press brake with pivoting apron, that is to say a press brake of the type comprising a fixed table carried by a frame and a pivoting apron carried by two lateral arms articulated on two horizontal doaxial pins supported by slides. movable in synchronism in slides carried by the frame, the active face of the deck being that framed by the lateral arms and oriented towards the pins of the latter.
- the deck rotates around a folding axis by winding the sheet around a cylinder centered on this axis and of determined radius.
- This method requires a double adjustment of the position of the pivoting apron since it is first necessary to adjust the position of the apron relative to the axis of rotation of its lateral support arms, as a function of the radius of the folding cylinder and of the thickness of the sheet, then move the articulation pins of the support arms of the apron to bring the latter back to its position of start of folding in which its active face is located in the extension of the horizontal upper face of the fixed table .
- the present invention aims to remedy these drawbacks by providing a press brake of the first type cited which not only requires only one position adjustment, but which also has the advantage of being easily adaptable to a command. programmed or digital control.
- this additional variable may have the disadvantage of complicating the calculation of the determination of the position of the slides for each folding operation, in particular if the press brake is equipped with adjustment means with manual control but, on the other hand , in the case of an automatic press brake with programmed control, this operating mode has the advantage of greater speed and greater precision than with traditional press brakes.
- each movable pin in its horizontal slide is axially linked to a horizontal adjustment screw carried by a nut, normally fixed, secured to the press frame, manual means or motors with automatic controls being provided to allow the synchronized rotation drive of the two slides.
- This safety wedge is advantageously constituted by a washer freely surrounding the screw of the fixed nut considered, having, on at least one of its faces, an annular weakening groove dividing it into two concentric annular parts separable by shearing and by one of which it bears against the frame while the fixed nut bears against the other.
- the press brake with pivoting apron of the invention comprises, like traditional press brakes of this type, a fixed horizontal table 2 arranged between the two lateral uprights 3 of a frame which supports it, between which is mounted, so as to be able to slide vertically above the table 2, a greenhouse sheet 4 guided by vertical slides 5 arranged on the opposite faces of the uprights 3 of the frame.
- the latter also support the pins 6, coaxial and of common horizontal axis 6a, of two lateral arms 7 supporting the pivoting deck 8.
- the active face 8a of this deck 8, which is the one framed by the two lateral arms 7, is normally located in the same horizontal plane as the upper face 2b of the table 2 when the deck 8 is in the starting position.
- This type of press is as follows: a sheet to be folded, not shown in the drawing, having previously been placed on the table 2 and the active face 8a of the deck 8 so that the line along which the folding is to be carried out coincides with the upper edge 2a of the edge front of the table, the sheet clamp 4 is then lowered to press this sheet against the table 2. The deck 8 is then pivoted in the direction of the arrow 9, so that its active face 8a folds the sheet to be folded around the front edge of the sheet clamp 4.
- This active face 8a of the apron 8 is generally constituted by an attached piece 11 and removably fixed against the corresponding edge of the apron 8a and capable of being replaced in the event of wear or other deterioration.
- the front edge 4a of the sheet clamp 4 is also constituted by an insert and interchangeable.
- the position of the pins 6 depends, on the one hand, on the radius of curvature of the desired folding and, on the other hand, on the thickness of the sheet to be folded and, for this reason, the pins 6 are mounted on sliders 12 capable of being moved in synchronism and on strictly equal strokes.
- the guide slide 13 of each slide 12 is arranged horizontally with so that the common axis 6a of the pins 6 is always located in the same horizontal plane as the upper face 2b of the table 2 and, therefore, that the active face 8a of the apron 8 when it is in the starting position as illustrated in FIG. 1.
- the apron 8 is fixed to its lateral support arms 7 so that the rear edge 8b of its active face 8a, c ' that is to say that closest to the upper edge 2a of the front edge of the table 2 when it is in the starting position as illustrated in FIG. 1, ie coincides with the common axis 6a of the pins 6.
- Each slide 13 of a slide 12 is further arranged so that, in one of the extreme positions of the slides 12, the edges 2a of the table 2 and 8b of the active face 8a of the deck 8 are practically coincident with each other and with the common axis 6a of the pins 6, as appears from the examination of FIG. 1.
- this press brake requires only a single adjustment operation which consists in moving the sliders 12 so as to bring the common axis 6a of the pins 6 into the position imposed by the desired shape of the folding.
- Figures 2 to 4 illustrate three different folding operations of a sheet 14 of the same thickness, the angular travel ⁇ of the pivoting apron 8 being, respectively, 60 °, 90 ° and 120 °
- Figure 5 is a figure similar to Figures 2 to 4 but supplemented by the means for adjusting the position of the corresponding slide 12 and these adjusting means comprise a safety device described below.
- Each slide 12 is linked axially to a screw 15 engaged in a nut 16 secured to the frame 3.
- a safety wedge 18 is interposed between the rear face 16a of the nut 16 by which it bears against the frame 3 and the opposite face 3a of the latter serving as its support, interposed a safety wedge 18.
- this safety wedge 18 is of annular shape and it has, on each of its lateral faces, a weakening groove also annular 19 dividing it into two concentric annular parts, the inner one 18a and the other exterior 18b.
- the external diameter of the nut 16 is equal to the diameter of the groove 19, while the bearing face of the frame 3 has, in its center, a cylindrical recess 21 concentric with the screw 15 and of internal diameter equal to the diameter of the groove 19 of the safety wedge 18.
- This arrangement has the effect that, in the case where the force acting in the direction of the arrow 17 on the screw 15 and the nut 16 exceeds a predetermined threshold, the two concentric parts 18a and 18b of the safety wedge 18, are separated by shearing, which allows the nut 16 and the screw 15 to recede over a stroke a equal to the length of the cylindrical recess 21.
- This recoil stroke of the screw 15 has the immediate effect of decreasing considerably the value of the force acting in the direction of the arrow 17 on the screw 15 and consequently eliminating any risk of rupture of the screw 15 and the nut 16.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Vehicle Step Arrangements And Article Storage (AREA)
- Sheet Holders (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Soil Working Implements (AREA)
- Glass Compositions (AREA)
- Forging (AREA)
Abstract
Cette presse plieuse est du type comportant une table fixe (2) portée par un bâti (3) et un tablier pivotant (8) porté par deux bras latéraux (7) articulés sur deux tourillons coaxiaux (6) horizontaux supportés par des coulisseaux (12) mobiles en synchronisme dans des glissières (13) portées par le bâti (3), la face active (8a) du tablier (8) étant celle encadrée par les bras latéraux (7) et orientée vers les tourillons (6) de ces derniers. D'une part, le tablier pivotant (8) est fixé rigidement à ses bras supports latéraux (7) de manière que l'arête (8b) de sa face active (8a) la plus proche de la table (2) lorsqu'il est en position de départ soit confondue avec l'axe commun (6a) des tourillons (6) d'articulation au bâti (3) des bras supports (7) du tablier (8) et, d'autre part, les glissières (13) de guidage des coulisseaux (12) supportant les tourillons (6) d'articulation des bras supports (7) du tablier pivotant (8) sont disposées horizontalement de manière que l'axe commun (6a) des tourillons (6) soit toujours situé dans le même plan horizontal que la face supérieure (2b) de la table fixe (2) et la face active (8a) du tablier pivotant (8), l'une des positions extrêmes des coulisseaux (12) correspondant à la mise en coïncidence des deux arêtes (2a,8b) de la table fixe (2) et de la face active (8a) du tablier (8) et, par conséquent, de l'axe commun (6a) des tourillons (6) d'articulation des bras supports (7) du tablier pivotant (8).This press brake is of the type comprising a fixed table (2) carried by a frame (3) and a pivoting apron (8) carried by two lateral arms (7) articulated on two horizontal coaxial pins (6) supported by sliders (12 ) movable in synchronism in slides (13) carried by the frame (3), the active face (8a) of the deck (8) being that framed by the lateral arms (7) and oriented towards the pins (6) of the latter . On the one hand, the pivoting deck (8) is rigidly fixed to its lateral support arms (7) so that the edge (8b) of its active face (8a) closest to the table (2) when is in the starting position is coincident with the common axis (6a) of the pins (6) of articulation to the frame (3) of the support arms (7) of the deck (8) and, on the other hand, the slides (13 ) for guiding the slides (12) supporting the pins (6) for articulation of the support arms (7) of the pivoting deck (8) are arranged horizontally so that the common axis (6a) of the pins (6) is always located in the same horizontal plane as the upper face (2b) of the fixed table (2) and the active face (8a) of the pivoting apron (8), one of the extreme positions of the slides (12) corresponding to the coincidence of the two edges (2a, 8b) of the fixed table (2) and of the active face (8a) of the deck (8) and, consequently, of the common axis (6a) of the journals (6) of articulation of the support arms (7) of the deck pivoting (8).
Description
La présente invention concerne une presse plieuse à tablier pivotant, c'est-à-dire une presse plieuse du type comportant une table fixe portée par un bâti et un tablier pivotant porté par deux bras latéraux articulés sur deux tourillons doaxiaux horizontaux supportés par des coulisseaux mobiles en synchronisme dans des glissières portées par le bâti, la face active du tablier étant celle encadrée par les bras latéraux et orientée vers les tourillons de ces derniers.The present invention relates to a press brake with pivoting apron, that is to say a press brake of the type comprising a fixed table carried by a frame and a pivoting apron carried by two lateral arms articulated on two horizontal doaxial pins supported by slides. movable in synchronism in slides carried by the frame, the active face of the deck being that framed by the lateral arms and oriented towards the pins of the latter.
Dans les presses plieuses de ce type, généralement, le tablier tourne autour d'un axe de pliage en enroulant la tôle autour d'un cylindre centré sur cet axe et de rayon déterminé.In press brakes of this type, generally, the deck rotates around a folding axis by winding the sheet around a cylinder centered on this axis and of determined radius.
Cette méthode nécessite un double réglage de la position du tablier pivotant puisqu'il faut, en premier lieu, régler la position du tablier par rapport à l'axe de rotation de ses bras supports latéraux, en fonction du rayon du cylindre de pliage et de l'épaisseur de la tôle, puis, déplacer les tourillons d'articulation des bras supports du tablier pour ramener ce dernier dans sa position de début de pliage dans laquelle sa face active est située dans le prolongement de la face supérieure horizontale de la table fixe.This method requires a double adjustment of the position of the pivoting apron since it is first necessary to adjust the position of the apron relative to the axis of rotation of its lateral support arms, as a function of the radius of the folding cylinder and of the thickness of the sheet, then move the articulation pins of the support arms of the apron to bring the latter back to its position of start of folding in which its active face is located in the extension of the horizontal upper face of the fixed table .
En conséquence, dans ces presses plieuses, les glissières de guidage des coulisseaux supportant les tourillons d'articulation des bras supports latéraux du tablier sont verticales mais, en outre, le tablier est monté de façon à pouvoir être déplacé le long de ses bras supports, déplacement qui s'effectue donc transversalement par rapport à sa face active.Consequently, in these press brakes, the guide slides of the slides supporting the articulation pins of the lateral support arms of the apron are vertical but, moreover, the apron is mounted so that it can be moved along its support arms, displacement which therefore takes place transversely with respect to its active face.
On conçoit aisément que, non seulement ce double réglage conduit à une opération longue et onéreuse mais, qu'en outre, les efforts supportés par le tablier, lors d'une opération de pliage d'une tôle présentant une grande résistance mécanique au pliage, peuvent atteindre des valeurs considérables. Les moyens de déplacement et de maintien du tablier le long de ses bras supports latéraux auxquels sont transmis tous ces efforts doivent donc être largement dimensionnés.It is easy to see that, not only does this double adjustment lead to a long and expensive operation but, moreover, the forces supported by the deck, during a bending operation of a sheet having a high mechanical resistance to bending, can reach considerable values. The means for moving and holding the apron along its lateral support arms to which all these forces are transmitted must therefore be largely dimensioned.
Il existe un autre type de presse plieuse à tablier dans lequel les tourillons d'articulation des bras supports du tablier pivotant sont fixes par rapport du bâti, mais, en contrepartie, la table fixe est mobile verticalement par rapport au bâti, ce qui impose aussi un double réglage, c'est-à-dire, le réglage du tablier dans ses bras supports et celui de la table par rapport au bâti et donc par rapport aux tourillons. On retrouve donc, dans ce type de presse, les mêmes inconvénients que ceux recontrés avec les presses du premier type cité.There is another type of apron press brake in which the articulation pins of the support arms of the pivoting apron are fixed relative to the frame, but, in return, the fixed table is movable vertically relative to the frame, which also requires a double adjustment, that is to say, the adjustment of the apron in its support arms and that of the table in relation to the frame and therefore in relation to the pins. There are therefore, in this type of press, the same drawbacks as those encountered with presses of the first type mentioned.
La présente invention vise à remédier à ces inconvénients en fournissant une presse plieuse du premier type cité qui, non seulement ne nécessite qu'un seul réglage de position, mais qui présente, en outre, l'avantage de pouvoir être facilement adaptable à une commande programmée ou commande numérique.The present invention aims to remedy these drawbacks by providing a press brake of the first type cited which not only requires only one position adjustment, but which also has the advantage of being easily adaptable to a command. programmed or digital control.
A cet effet, dans cette presse plieuse, d'une part, le tablier pivotant est fixé rigidement à ses bras supports latéraux de manière que l'arête de sa face active la plus proche de la table lorsqu'il est en position de départ soit confondue avec l'axe commun des tourillons d'articulation au bâti des bras supports du tablier et, d'autre part, les glissières de guidage des coulisseaux supportant les tourillons d'articulation des bras supports du tablier pivotant sont disposées horizontalement de manière que l'axe commun des tourillons soit toujours situé dans le même plan horizontal que la face supérieure de la table fixe et la face active du tablier pivotant, l'une des positions extrêmes des coulisseaux correspondant à la mise en coïncidence des deux arêtes précitées de la table fixe et de la face active du tablier et, par conséquent, de l'axe commun des tourillons d'articulation des bras supports du tablier pivotant, tandis que la position de cet axe, lors d'un pliage, est déterminée par la formule :
X = (Ri + e) tg 
dans laquelle :
- X est la distance séparant les arêtes précitées de la table fixe et de la face active du coulisseau,
- Ri est le rayon intérieur de courbure de la tôle à plier, en fin de pliage,
- e est l'épaisseur de la tôle, et
- α l'angle de la rotation effectuée par le tablier lors d'une opération de pliage et qui est lui-même déterminé par l'angle auquel la tôle doit être pliée.For this purpose, in this press brake, on the one hand, the pivoting apron is rigidly fixed to its lateral support arms so that the edge of its active face closest to the table when it is in the starting position is combined with the common axis of the hinge pins on the frame of the support arms of the deck and, on the other hand, the slide guide rails supporting the hinge pins of the support arms of the pivoting deck are arranged horizontally so that the common axis of the pins is always located in the same horizontal plane as the upper face of the fixed table and the active face of the pivoting deck, one of the extreme positions of the slides corresponding to the coincidence of the two aforementioned edges of the table fixed and of the active face of the apron and, consequently, of the common axis of the articulation pins of the support arms of the pivoting apron, while the position of this axis, during folding, is determined by r the formula:
X = (Ri + e) tg
in which :
- X is the distance separating the above-mentioned edges from the fixed table and from the active face of the slide,
- Ri is the internal radius of curvature of the sheet to be bent, at the end of bending,
- e is the thickness of the sheet, and
- α the angle of rotation performed by the deck during a folding operation and which is itself determined by the angle at which the sheet must be folded.
Le mode de fonctionnement de cette presse plieuse, qui est de construction plus simple que les presses plieuses connues de ce type, ne nécessite qu'un réglage du position, celui de la position des tourillons d'articulation des bras supports du tablier mais il fait appel à une variable supplémentaire pour la détermination de la position des coulisseaux, à savoir la tangente de l'angle 
L'introduction de cette variable supplémentaire présente peut-être l'inconvénient de compliquer le calcul de la détermination de la position des coulisseaux pour chaque opération de pliage, notamment si la presse plieuse est équipée de moyens de réglage à commande manuelle mais, par contre, dans le cas d'une presse plieuse automatique à commande programmée, ce mode de fonctionnement présente l'avantage d'une plus grande rapidité et d'une plus grande précision qu'avec les presses plieuses traditionnelles.The introduction of this additional variable may have the disadvantage of complicating the calculation of the determination of the position of the slides for each folding operation, in particular if the press brake is equipped with adjustment means with manual control but, on the other hand , in the case of an automatic press brake with programmed control, this operating mode has the advantage of greater speed and greater precision than with traditional press brakes.
Suivant une forme d'exécution simple de l'invention, le coulisseau de chaque tourillon mobile dans sa glissière horizontale est lié axialement à une vis horizontale de réglage portée par un écrou, normalement fixe, solidaire du bâti de la presse, des moyens manuels ou moteurs à commandes automatiques étant prévus pour permettre l'entraînement en rotation synchronisée des deux coulisseaux.According to a simple embodiment of the invention, the slide of each movable pin in its horizontal slide is axially linked to a horizontal adjustment screw carried by a nut, normally fixed, secured to the press frame, manual means or motors with automatic controls being provided to allow the synchronized rotation drive of the two slides.
Suivant une forme d'exécution préférée de l'invention visant à protéger la presse plieuse contre des forces trop importantes transmises au tablier pivotant lors d'une opération de pliage, la face de l'écrou fixe, solidaire du bâti, tournée du côté de l'extrémité de la vis non liée au coulisseau correspondant, prend appui contre le bâti par l'intermédiaire d'une cale de sécurité apte à céder par cisaillage et autoriser un recul de l'écrou et de sa vis si les forces précitées dépassent un seuil prédéterminé.According to a preferred embodiment of the invention aimed at protecting the press brake against excessive forces transmitted to the pivoting deck during a folding operation, the face of the fixed nut, integral with the frame, turned towards the side the end of the screw not linked to the corresponding slide, bears against the frame by means of a safety wedge capable of yielding by shearing and authorizing a retraction of the nut and of its screw if the aforementioned forces exceed one predetermined threshold.
Cette cale de sécurité est avantageusement constituée par une rondelle entourant librement la vis de l'écrou fixe considéré, présentant, sur au moins l'une de ses faces, une gorge annulaire d'affaiblissement la divisant en deux parties annulaires concentriques séparables par cisaillage et par l'une desquelles elle est en appui contre le bâti tandis que l'écrou fixe est en appui contre l'autre.This safety wedge is advantageously constituted by a washer freely surrounding the screw of the fixed nut considered, having, on at least one of its faces, an annular weakening groove dividing it into two concentric annular parts separable by shearing and by one of which it bears against the frame while the fixed nut bears against the other.
De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de cette presse plieuse à tablier pivotant :
- Figure 1 en est une vue partielle en perspective ;
- Figures 2 à 4 sont des vues schématiques en coupe transversale illustrant le mode de fonctionnement de cette presse plieuse ;
- Figure 5 est une vue schématique illustrant une forme d'exécution des moyens de sécurité susceptibles d'équiper cette presse plieuse.
- Figure 1 is a partial perspective view;
- Figures 2 to 4 are schematic views in cross section illustrating the operating mode of this press brake;
- Figure 5 is a schematic view illustrating an embodiment of the security means capable of equipping this press brake.
La presse plieuse à tablier pivotant de l'invention comporte, comme les presses plieuses traditionnelles de ce type, une table horizontale fixe 2 disposée entre les deux montants latéraux 3 d'un bâti qui la supporte, entre lesquels est monté, de manière à pouvoir coulisser verticalement au-dessus de la table 2, un serre-tôle 4 guidé par des glissières verticales 5 aménagées sur les faces en regard des montants 3 du bâti. Ces derniers supportent en outre les tourillons 6, coaxiaux et d'axe horizontal commun 6a, de deux bras latéraux 7 supportant le tablier pivotant 8.The press brake with pivoting apron of the invention comprises, like traditional press brakes of this type, a fixed horizontal table 2 arranged between the two lateral uprights 3 of a frame which supports it, between which is mounted, so as to be able to slide vertically above the table 2, a greenhouse sheet 4 guided by vertical slides 5 arranged on the opposite faces of the uprights 3 of the frame. The latter also support the
La face active 8a de ce tablier 8, qui est celle encadrée par les deux bras latéraux 7, est normalement située dans le même plan horizontal que la face supérieure 2b de la table 2 lorsque le tablier 8 est en position de départ.The
Le fonctionnement de ce type de presse est le suivant :
une tôle à plier, non représentée sur le dessin, ayant été préalablement posée sur la table 2 et la face active 8a du tablier 8 de manière que la ligne le long de laquelle le pliage doit être réalisé coïncide avec l'arête supérieure 2a du bord antérieur de la table, le serre-tôle 4 est alors descendu pour presser cette tôle contre la table 2. Le tablier 8 est ensuite pivoté dans le sens de la flèche 9, de telle sorte que sa face active 8a effectue le pliage de la tôle à plier autour du bord antérieur du serre-tôle 4. Cette face active 8a du tablier 8 est généralement constituée par un pièce 11 rapportée et fixée de manière amovible contre le bord correspondant du tablier 8a et apte à être remplacée en cas d'usure ou autre détérioration.The operation of this type of press is as follows:
a sheet to be folded, not shown in the drawing, having previously been placed on the table 2 and the
Comme cela ressort de l'examen de la figure 1, le bord antérieur 4a du serre-tôle 4 est lui aussi constitué par une pièce rapportée et interchangeable.As appears from the examination of Figure 1, the front edge 4a of the sheet clamp 4 is also constituted by an insert and interchangeable.
On conçoit aisément que la position des tourillons 6 dépend, d'une part, du rayon de courbure du pliage désiré et, d'autre part, de l'épaisseur de la tôle à plier et, pour cette raison, les tourillons 6 sont montés sur des coulisseaux 12 aptes à être déplacés en synchronisme et sur des courses rigoureusement égales.It is easy to see that the position of the
Pour permettre le réglage de la position des tourillons 6 en une seule opération au lieu de deux, comme cela est le cas dans les plieuses connues de ce type, selon l'invention, la glissière de guidage 13 de chaque coulisseau 12 est disposée horizontalement de manière que l'axe commun 6a des tourillons 6 soit toujours situé dans le même plan horizontal que la face supérieure 2b de la table 2 et, par conséquent, que la face active 8a du tablier 8 lorsqu'il est en position de départ telle qu'illustrée sur la figure 1. En outre, le tablier 8 est fixé à ses bras supports latéraux 7 de manière que l'arête postérieure 8b de sa face active 8a, c'est-à-dire celle la plus proche de l'arête supérieure 2a du bord antérieur de la table 2 lorsqu'il est en position de départ comme illustrée sur la figure 1, soit confondue avec l'axe commun 6a des tourillons 6.To allow the position of the
Chaque glissière 13 d'un coulisseau 12 est en outre disposée de manière que, dans l'une des positions extrêmes des coulisseaux 12, les arêtes 2a de la table 2 et 8b de la face active 8a du tablier 8 soient pratiquement confondues entre elles et avec l'axe commun 6a des tourillons 6, comme cela ressort de l'examen de la figure 1.Each
Il en résulte que le fonctionnement de cette presse plieuse ne nécessite qu'une seule opération de réglage qui consiste à déplacer les coulisseaux 12 de manière à amener l'axe commun 6a des tourillons 6 dans la position imposée par la forme recherchée du pliage.It follows that the operation of this press brake requires only a single adjustment operation which consists in moving the sliders 12 so as to bring the common axis 6a of the
Si l'on appelle Ri le rayon de courbure antérieure de pliage de la tôle à plier 14 (figures 2 à 4), e l'épaisseur de la tôle 14 et α l'angle auquel doit être pliée la tôle 14, la distance X à laquelle doit être positionné l'axe commun 6a des tourillons 6 par rapport à l'arête antérieure 2a de la table 2 est donné par la formule suivante :
X = (Ri + e) tg 
X = (Ri + e) tg
Les figures 2 à 4 illustrent trois opérations de pliage différentes d'une tôle 14 de même épaisseur, la course angulaire α du tablier pivotant 8 étant, respectivement, de 60°, 90° et 120°Figures 2 to 4 illustrate three different folding operations of a
Comme on le voit nettement en examinant les figures 2 à 4, au cours d'une opération de pliage, le tablier 8 pivote autour de son arête postérieure 8b puisque cette dernière est constamment confondue avec l'axe commun 6a des tourillons 6.As can be clearly seen by examining FIGS. 2 to 4, during a folding operation, the
La figure 5 est une figure similaire aux figures 2 à 4 mais complétée par les moyens de réglage de la position du coulisseau 12 correspondant et ces moyens de réglage comportent un dispositif de sécurité décrit ci-après.Figure 5 is a figure similar to Figures 2 to 4 but supplemented by the means for adjusting the position of the corresponding slide 12 and these adjusting means comprise a safety device described below.
Chaque coulisseau 12 est lié axialement à une vis 15 engagée dans un écrou 16 solidaire du bâti 3.Each slide 12 is linked axially to a
On conçoit aisément qu'en manoeuvrant la vis 15 dans un sens ou dans l'autre, on déplace le coulisseau 12 qui lui est associé dans le même sens puisque l'écrou 16 est mobile tant en rotation qu'en translation. Lors d'une opération de pliage, la résistance au pliage de la tôle 14 exerce contre le tablier 8, et plus particulièrement contre la pièce 8a de ce dernier, une force de réaction entièrement supportée par les tourillons 6 et agissant dans le sens tendant à déplacer les coulisseaux 12 dans le sens correspondant à augmenter la distance X, c'est-à-dire dans le sens illustré par la flèche 17. Cette force est donc entièrement supportée par la vis 15 et l'écrou 16 et, si cette force dépasse la force maximale pour laquelle cette vis 15 et cet écrou 16 ont été calculés, il y a des risques de détérioration de ces deux organes.It is easy to see that by maneuvering the
Par mesure de sécurité, suivant une caractéristique intéressante de l'invention, entre la face postérieure 16a de l'écrou 16 par laquelle il est en appui contre le bâti 3 et la face opposée 3a de ce dernier lui servant d'appui, est interposée une cale de sécurité 18.As a safety measure, according to an advantageous characteristic of the invention, between the rear face 16a of the
Dans l'exemple illustré sur le dessin, cette cale de sécurité 18 est de forme annulaire et elle présente, sur chacune de ses faces latérales, une gorge d'affaiblissement également annulaire 19 la divisant en deux parties annulaires concentriques, l'une intérieure 18a et l'autre extérieure 18b.In the example illustrated in the drawing, this safety wedge 18 is of annular shape and it has, on each of its lateral faces, a weakening groove also annular 19 dividing it into two concentric annular parts, the inner one 18a and the other exterior 18b.
Par ailleurs, le diamètre extérieur de l'écrou 16 est égal au diamètre dela gorge 19, tandis que la face d'appui du bâti 3 présente, en son centre, un évidement cylindrique 21 concentrique à la vis 15 et de diamètre intérieur égal au diamètre de la gorge 19 de la cale de sécurité 18.Furthermore, the external diameter of the
Cette disposition a pour effet que, dans le cas où la force agissant dans le sens de la flèche 17 sur la vis 15 et l'écrou 16 dépasse un seuil prédéterminé, les deux parties concentriques 18a et 18b de la cale de sécurité 18, sont séparées par cisaillage, ce qui autorise en recul de l'écrou 16 et de la vis 15 sur une course a égale à la longueur de l'évidement cylindrique 21. Cette course de recul de la vis 15 a l'effet immédiat de faire décroître considérablement la valeur de la force agissant dans le sens de la flèche 17 sur la vis 15 et d'éliminer par conséquent tout risque de rupture de la vis 15 et de l'écrou 16.This arrangement has the effect that, in the case where the force acting in the direction of the arrow 17 on the
Claims (4)
X =(Ri + e) tg
dans laquelle :
- X est la distance séparant les arêtes précitées (2a,8b) de la table fixe (2) et de la face active (8a) du tablier (8),
- Ri est le rayon intérieur de courbure de la tôle à plier, en fin de pliage,
- e est l'épaisseur de la tôle, et
- α l'angle de la rotation effectuée par le tablier (8) lors d'une opération de pliage et qui est lui-même déterminé par l'angle auquel la tôle doit être pliée.1.- Press brake with pivoting apron, of the type comprising a fixed table (2) carried by a frame (3) and a pivoting apron (8) carried by two lateral arms (7) articulated on two horizontal coaxial pins (6) supported by slides (12) movable in synchronism in slides (13) carried by the frame (3), the active face (8a) of the deck (8) being that framed by the lateral arms (7) and oriented towards the pins ( 6) of the latter, characterized in that, on the one hand, the pivoting apron (8) is rigidly fixed to its lateral support arms (7) so that the edge (8b) of its active face (8a) la closer to the table (2) when in the starting position is coincident with the common axis (6a) of the pins (6) of articulation to the frame (3) of the support arms (7) of the deck (8) and, on the other hand, the slides (13) for guiding the slides (12) supporting the pins (6) of articulation of the support arms (7) of the pivoting apron (8) are arranged horizontally. in such a way that the common axis (6a) of the pins (6) is always located in the same horizontal plane as the upper face (2b) of the fixed table (2) and the active face (8a) of the pivoting apron (8 ), one of the extreme positions of the slides (12) corresponding to the coincidence of the two edges (2a, 8b) of the fixed table (2) and of the active face (8a) of the deck (8) and, by Consequently, the common axis (6a) of pins (6) for articulation of the support arms (7) of the pivoting deck (8), while the position of this axis (6a), during folding, is determined by the formula:
X = (Ri + e) tg
in which :
- X is the distance separating the above-mentioned edges (2a, 8b) from the fixed table (2) and from the active face (8a) of the deck (8),
- Ri is the internal radius of curvature of the sheet to be bent, at the end of bending,
- e is the thickness of the sheet, and
- α the angle of rotation performed by the deck (8) during a folding operation and which is itself determined by the angle at which the sheet must be bent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87420097T ATE51777T1 (en) | 1986-04-16 | 1987-04-13 | BENDING PRESS WITH SWING BEAM. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8605981 | 1986-04-16 | ||
| FR8605981A FR2597398B1 (en) | 1986-04-16 | 1986-04-16 | PIVOTING APRON BENDING PRESS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0242309A1 true EP0242309A1 (en) | 1987-10-21 |
| EP0242309B1 EP0242309B1 (en) | 1990-04-11 |
Family
ID=9334598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87420097A Expired - Lifetime EP0242309B1 (en) | 1986-04-16 | 1987-04-13 | Bending press with pivoting beam |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4768367A (en) |
| EP (1) | EP0242309B1 (en) |
| AT (1) | ATE51777T1 (en) |
| DE (1) | DE3762190D1 (en) |
| ES (1) | ES2014033B3 (en) |
| FR (1) | FR2597398B1 (en) |
| GR (1) | GR3000433T3 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316703A2 (en) * | 1987-11-19 | 1989-05-24 | Feintool International Holding | Method and apparatus for bending work pieces |
| WO1991006382A1 (en) * | 1989-10-26 | 1991-05-16 | Reinhardt Maschinenbau Gmbh | Device for bending sheet metal |
| EP1810761A1 (en) * | 2006-01-24 | 2007-07-25 | Ralf Beger | Sheet folding device |
| DE102008064227B3 (en) * | 2008-12-22 | 2010-05-27 | Ralf Beger | A method for folding a sheet metal part in a Blechabkantvorrichtung and suitable for performing this method Blechabkantvorrichtung for folding a sheet metal part |
| CN106001195A (en) * | 2016-05-25 | 2016-10-12 | 广西田阳至恒门业有限公司 | Bending machine |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3935658A1 (en) * | 1989-10-26 | 1991-05-02 | Reinhardt Gmbh Maschbau | METHOD FOR TURNING A SHEET OPTIMALLY |
| US5259231A (en) * | 1989-10-26 | 1993-11-09 | Reinhardt Maschinenbau Gmbh | Process for the two-directional bending of sheet metal |
| FR2667520A1 (en) * | 1990-10-05 | 1992-04-10 | Guillaume Bernard | Bending press having a table (board) articulated by means of a hinge |
| DE19523226A1 (en) * | 1995-06-27 | 1995-12-14 | Joachim Linde | System for bending sheet metal |
| DE19844244A1 (en) * | 1998-09-26 | 2000-03-30 | Fastenrath Fasti Werk | Device for bending sheet metal |
| DE10245777A1 (en) * | 2002-09-26 | 2004-04-08 | Reinhardt Maschinenbau Gmbh | A bending machine for metal sheets has an interchangeable bending tool mounted on a number of wedge blocks by which fine adjustment may be made |
| US7228721B2 (en) | 2003-01-17 | 2007-06-12 | Tapco International Corporation | Pivot link for sheet bending brake and sheet bending brake including pivot link |
| US6988323B2 (en) * | 2003-06-10 | 2006-01-24 | Mcadam Perry | Tool kit and method for working sheet metal trims |
| DE102018000971B3 (en) | 2018-02-02 | 2019-03-07 | Gustav-Adolf Hochstrate | Swivel bending machine with adjustment of the swivel axis of the bending beam |
| CN108714637B (en) * | 2018-03-29 | 2019-11-19 | 苏州赛腾精密电子股份有限公司 | A kind of folding material device suitable for automation equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE303138C (en) * | ||||
| DE584362C (en) * | 1933-09-19 | Hiltmann & Lorenz Akt Ges Masc | Bending beam for folding machines | |
| US3188848A (en) * | 1962-01-30 | 1965-06-15 | Oliver Machinery Co | Folder brakes for forming corners in sheet material |
| FR2502518A1 (en) * | 1981-03-26 | 1982-10-01 | Favrin Pierre | Folding press for return bends in sheet metal - has folding plate pivoting in two planes against bolster |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1194602A (en) * | 1916-08-15 | Mechanism | ||
| CA469946A (en) * | 1950-12-12 | Anderson Frohman | Apparatus and methods for working sheet metal | |
| FR1040494A (en) * | 1951-08-10 | 1953-10-15 | Bending machine for sheet metal and similar material | |
| FR1454083A (en) * | 1965-10-22 | 1966-07-22 | Plamag Plauener Druckmaschinen | Device for bending clichés and printing plates |
| FR2509204A1 (en) * | 1981-07-07 | 1983-01-14 | Jouanel Sa Ets Y | AUTOMATIC SHEET BENDER |
-
1986
- 1986-04-16 FR FR8605981A patent/FR2597398B1/en not_active Expired - Lifetime
-
1987
- 1987-04-13 ES ES87420097T patent/ES2014033B3/en not_active Expired - Lifetime
- 1987-04-13 DE DE8787420097T patent/DE3762190D1/en not_active Expired - Lifetime
- 1987-04-13 AT AT87420097T patent/ATE51777T1/en active
- 1987-04-13 EP EP87420097A patent/EP0242309B1/en not_active Expired - Lifetime
- 1987-04-16 US US07/039,607 patent/US4768367A/en not_active Expired - Lifetime
-
1990
- 1990-04-12 GR GR90400149T patent/GR3000433T3/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE303138C (en) * | ||||
| DE584362C (en) * | 1933-09-19 | Hiltmann & Lorenz Akt Ges Masc | Bending beam for folding machines | |
| US3188848A (en) * | 1962-01-30 | 1965-06-15 | Oliver Machinery Co | Folder brakes for forming corners in sheet material |
| FR2502518A1 (en) * | 1981-03-26 | 1982-10-01 | Favrin Pierre | Folding press for return bends in sheet metal - has folding plate pivoting in two planes against bolster |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316703A2 (en) * | 1987-11-19 | 1989-05-24 | Feintool International Holding | Method and apparatus for bending work pieces |
| EP0316703A3 (en) * | 1987-11-19 | 1990-07-11 | Feintool International Holding | Method and apparatus for bending work pieces |
| WO1991006382A1 (en) * | 1989-10-26 | 1991-05-16 | Reinhardt Maschinenbau Gmbh | Device for bending sheet metal |
| US5239853A (en) * | 1989-10-26 | 1993-08-31 | Reinhardt Maschinenbau Gmbh | Device for bending sheet metal |
| EP1810761A1 (en) * | 2006-01-24 | 2007-07-25 | Ralf Beger | Sheet folding device |
| DE102008064227B3 (en) * | 2008-12-22 | 2010-05-27 | Ralf Beger | A method for folding a sheet metal part in a Blechabkantvorrichtung and suitable for performing this method Blechabkantvorrichtung for folding a sheet metal part |
| EP2198985B1 (en) * | 2008-12-22 | 2015-07-08 | Ralf Beger | Method and device for rounding off a sheet metal part |
| CN106001195A (en) * | 2016-05-25 | 2016-10-12 | 广西田阳至恒门业有限公司 | Bending machine |
| CN106001195B (en) * | 2016-05-25 | 2018-05-29 | 广西田阳至恒门业有限公司 | Bender |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2014033B3 (en) | 1990-06-16 |
| GR3000433T3 (en) | 1991-06-28 |
| ATE51777T1 (en) | 1990-04-15 |
| US4768367A (en) | 1988-09-06 |
| EP0242309B1 (en) | 1990-04-11 |
| FR2597398B1 (en) | 1990-12-07 |
| DE3762190D1 (en) | 1990-05-17 |
| FR2597398A1 (en) | 1987-10-23 |
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