EP1697088B1 - Quick clamping device and control method - Google Patents
Quick clamping device and control method Download PDFInfo
- Publication number
- EP1697088B1 EP1697088B1 EP04805643A EP04805643A EP1697088B1 EP 1697088 B1 EP1697088 B1 EP 1697088B1 EP 04805643 A EP04805643 A EP 04805643A EP 04805643 A EP04805643 A EP 04805643A EP 1697088 B1 EP1697088 B1 EP 1697088B1
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- European Patent Office
- Prior art keywords
- arm
- rod
- ram
- clamping
- clamping device
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 15
- 210000002445 nipple Anatomy 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 description 3
- 240000008042 Zea mays Species 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/08—Arrangements for positively actuating jaws using cams
- B25B5/087—Arrangements for positively actuating jaws using cams actuated by a hydraulic or pneumatic piston
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/061—Arrangements for positively actuating jaws with fluid drive
- B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction
Definitions
- the invention relates generally to techniques relating to mechanical machining.
- the invention relates, according to a first aspect, to a device for clamping a workpiece on a tool, comprising a jack and a flange, the jack being selectively actuated by a pressurized fluid and comprising itself a body fixed in operation to the tool and a rod movable relative to the body, and the flange being hinged about a pivot axis on the rod and selectively driven by the rod, this flange struggling on a determined race between a position clamping and releasing position, and rotated on at least part of its stroke.
- the flange is approximated to the workpiece to be clamped and applied to it by simple rotation of this flange about its pivot axis.
- the rotation of the flange may have the effect of sliding the workpiece to be clamped or deformed.
- the main purpose of the invention is to provide a compact, fast, retractable, powerful clamping device, and moreover free from the aforementioned defects.
- the device of the invention is essentially characterized by it further comprises guiding members and bearing elements, in that the guiding members comprise a guiding member fixed relative to the body and a movable guiding member connected to the flange, these guiding members.
- the support elements comprise a fixed support element relative to the body and a movable support element connected to the flange, these fixed and movable support elements cooperating selectively, at least on the end of the stroke of the flange to its clamping position, to afford each other, away from the guide members, a sliding contact parallel to the translational movement of the flange and allowing a bridging of the flange on the piece to ser rer.
- the rod extends along a translation axis which passes between the guide members and the support elements, this arrangement allowing a balancing of the forces resistant to clamping and a very effective self-locking of the flange.
- the movable guide member is for example constituted by a cam formed of two grooves hollowed symmetrically in the flange on either side of a median plane of the flange and the rod, transverse to the pivot axis.
- Each groove advantageously has a path whose first and second ends are respectively relatively distant and relatively close to the pivot axis, this path approaching continuously the pivot axis from its first end to its second end, and comprising a portion straight pathway terminating at the first end and a curved path portion adjacent to the straight path portion and terminating at the second end.
- the flange is retractable completely automatically.
- the fixed guide member may then be constituted by a pair of pins or rollers attached to the cylinder body and respectively engaged in the grooves forming the cam.
- the movable support element is for example constituted by a bearing heel carried by the flange and extending symmetrically on either side of a median plane of the flange and the rod, transverse to the axis pivoting, the fixed support element then itself being constituted by a bearing surface of the cylinder body, on which the bearing heel bears symmetrically with respect to said median plane.
- the jack is a double-acting jack, for example hydraulic, comprising first and second chambers separated by a piston integral with the rod, the flange being driven from its release position to its clamping position by admission of fluid under pressure into the first chamber of the jack, and being driven from its position clamping to its release position by admission of fluid under pressure in the second chamber of the cylinder.
- the fixed guide member and the fixed support member may be carried by a portion of the cylinder body which is shaped as a yoke, the flange being guided in its median plane between two parallel faces vis-à-vis this part forming a screed.
- the flange is for example shaped as a yoke and encloses the body of the jack which guides it in its median plane.
- each pin or roller is advantageously located above a plane transverse to the rod containing the pivot axis, in a direction corresponding to the movement that the rod makes to drive the flange to its release position .
- a perfect retraction of the flange can be obtained by providing that the flange rotates at least equal to 90 degrees between its clamping position and its release position.
- the invention also relates, according to a second of its aspects, to a control method of the device previously described, this method being characterized in that it comprises an operation consisting of measuring the pressure of the actuating fluid admitted into this device and check the position of the flange and / or the clamping force by checking the value of the measured pressure.
- the invention relates to a device for clamping a workpiece P on a tool for machining thereof, this device essentially comprising a jack 1 and a clamp 2.
- the jack 1 is for example constituted by a double-acting hydraulic jack and comprises a body 10 fixed in operation to the tool itself placed in a machining center, and a rod 11 movable relative to the body 10 of this jack .
- the body 10 of the jack has a bore inside which a piston 12, integral with the rod 11, defines two chambers 101 and 102 of variable and complementary volumes, opening on the outside by means of respective ports 101p and 102p each of which can be connected to a high pressure hydraulic source while the other is connected to a low pressure reservoir.
- the flange 2 which is articulated on the rod 11 about a pivot axis X, is driven at will by the rod 11, itself driven by the piston 12.
- the flange 2 thus struggles, on a determined stroke, between a clamping position illustrated in particular in FIGS. 1 to 3, and a release position, illustrated in Figure 4 for the first embodiment, and in Figure 11 for the second embodiment.
- the flange 2 is driven from its release position to its clamping position by admission of fluid under pressure in the first chamber 101 of the cylinder 1, and is driven from its clamping position to its release position by admission of fluid under pressure in the second chamber 102 of this cylinder 1.
- the device of the invention derives most of its advantages from the fact that it comprises guide members 3 and bearing elements 4, the guide members 3 themselves comprising a guide member 31 fixed with respect to the body 10 and a movable guide member 32 connected to the flange 2, and the support elements 4 comprising, in the same way, a support member 41 fixed relative to the body 10 and a movable support member 42 connected at the flange 2.
- the fixed and movable guide members, 31 and 32 cooperate to drive the flange 2 in a rotational movement about the pivot axis X at least at the end of the stroke of this flange towards its release position, and for driving the flange 2 in a translation movement at least at the end of the stroke of this flange to its clamping position.
- the fixed and mobile support elements, 41 and 42 cooperate, at least at the end of the stroke of the flange 2 towards its clamping position, to afford each other, at a distance from the guide members 3 , a sliding contact parallel to the translational movement of the flange 2 and allowing a bracing of the flange 2 on the part to be clamped P.
- the rod 11 preferably extends along a translation axis Z which passes between the guide members 3 and the support elements 4.
- the movable guide member 32 is constituted by a cam formed of two grooves, such as 32a, hollowed symmetrically in the flange 2 on either side of a median plane M of the device , this median plane M being transverse to the pivot axis X and constituting a plane of symmetry for the flange 2 and for the rod 11.
- the flange 2 thus has a groove 32b which, although not visible in the figures, is deduced from the groove 32a by symmetry with respect to the plane M.
- Each of the grooves 32a and 32b has a path that is continuously approaching the pivot axis X from the first end 321 of this path to its second end 322.
- this path includes a straight path portion 320r terminating at the first end 321 and a curved path portion 320c adjacent to the straight path portion 320r and terminating at the end. second end 322.
- the fixed guide member 31 is constituted by a pair of pins or rollers, such as 31a, fixed to the body 10 of the cylinder 1 and respectively engaged in the grooves forming the cam.
- the body 10 thus has a stud or a roller 31b engaged in the groove 32b and which, although not visible in the figures, is deduced from the stud or roller 31a by symmetry by ratio to the median plane M.
- each pin or roller such as 31a is located above a plane T which is transverse to the rod 11 and which contains the pivot axis X, when following a direction that corresponds to the movement made by the rod 11 to drive the flange 2 to its release position.
- the movable support element 42 is constituted by a bearing heel which is carried by the flange 2 and which extends symmetrically on either side of the median plane M of the device.
- the fixed support element 41 is constituted by an external bearing surface of the body 10 of the cylinder 1, on which the support heel 42 bears symmetrically with respect to the same median plane M.
- the rod 11 leaves the jack 1 on the side of its first chamber 101.
- the fixed guide member 31 and the fixed support member 41 are advantageously carried by a portion 100 of the body 10 of the jack which is shaped as a yoke, and the flange 2 is then guided in its median plane M between two parallel faces vis-a-vis, 100a and 100b, belonging to this portion 100 forming a screed.
- This embodiment allows a large rotation of the flange 2 between its clamping position and its release position, typically a rotation of amplitude equal to or greater than 90 degrees.
- the jack 1 can in this case be mounted in a base 5 fixed to the tool, forming a fluid distributor, and therefore itself comprising two fluid inlet-outlet ports 101q. and 102q respectively corresponding to the ports 101p and 102p of the jack 1.
- the rod 11 leaves the jack 1 on the side of its second chamber 102.
- the flange 2 which is shaped as a yoke, this flange then enclosing the body 10 of the cylinder 1, which guides it in its median plane M.
- the measured pressure reaches or exceeds a determined minimum threshold, typically to prevent the clamping force from being insufficient, or to provide that the measured pressure remains below a maximum threshold determined for example to prevent the clamping force from damaging the workpiece.
- this method has the additional advantage of allowing a very fine adjustment of the clamping force in the case where the actuating fluid is constituted by compressed air.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Communication Control (AREA)
- Clamps And Clips (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
L'invention concerne, de façon générale, les techniques relatives à l'usinage mécanique.The invention relates generally to techniques relating to mechanical machining.
Plus précisément, l'invention concerne, selon un premier de ses aspects, un dispositif de serrage d'une pièce sur un outillage, comprenant un vérin et une bride, le vérin étant sélectivement actionné par un fluide sous pression et comprenant lui-même un corps fixé en fonctionnement à l'outillage et une tige mobile par rapport au corps, et la bride étant articulée autour d'un axe de pivotement sur la tige et sélectivement entraînée par la tige, cette bride se débattant sur une course déterminée entre une position de serrage et une position de relâchement, et subissant une rotation sur une partie au moins de sa course.More specifically, the invention relates, according to a first aspect, to a device for clamping a workpiece on a tool, comprising a jack and a flange, the jack being selectively actuated by a pressurized fluid and comprising itself a body fixed in operation to the tool and a rod movable relative to the body, and the flange being hinged about a pivot axis on the rod and selectively driven by the rod, this flange struggling on a determined race between a position clamping and releasing position, and rotated on at least part of its stroke.
Les dispositifs de serrage sont bien connus en construction mécanique.Clamping devices are well known in mechanical engineering.
Dans leur forme de réalisation la plus ancienne et la plus rudimentaire, ces dispositifs utilisent des vérins à vis fonctionnant à la manière d'un étau, ces dispositifs ayant cependant le défaut aujourd'hui rédhibitoire d'exiger un temps d'actionnement très important.In their oldest and most rudimentary embodiment, these devices use screw jacks operating in the manner of a vice, these devices having the defect today unacceptable to require a very important actuation time.
Dans les dispositifs de serrage plus récents, qui utilisent des vérins hydrauliques ou pneumatiques, la bride est approchée de la pièce à serrer et appliquée sur elle par simple rotation de cette bride autour de son axe de pivotement.In the newer clamping devices, which use hydraulic or pneumatic cylinders, the flange is approximated to the workpiece to be clamped and applied to it by simple rotation of this flange about its pivot axis.
Bien qu'ils puissent être actionnés rapidement, ces dispositifs présentent cependant eux-mêmes plusieurs défauts.Although they can be operated quickly, these devices themselves, however, have several defects.
En particulier, la rotation de la bride peut avoir pour effet de faire glisser la pièce à serrer ou de la déformer.In particular, the rotation of the flange may have the effect of sliding the workpiece to be clamped or deformed.
Compte tenu de la distance relativement importante entre son axe de rotation et son appui sur la pièce à serrer, la bride elle-même peut subir un flambage, ce qui provoque une imprécision inacceptable du serrage.Given the relatively large distance between its axis of rotation and its support on the part to be clamped, the flange itself can buckle, which causes unacceptable inaccuracy of clamping.
De plus, l'importance du couple résistant au serrage oblige à sur-dimensionner les dispositifs connus de ce type.In addition, the importance of the torque resistant to tightening forces to over-size the known devices of this type.
Dans ce contexte, l'invention a pour but principal de proposer un dispositif de serrage compact, rapide, escamotable, puissant, et de surcroît exempt des défauts précédemment mentionnés.In this context, the main purpose of the invention is to provide a compact, fast, retractable, powerful clamping device, and moreover free from the aforementioned defects.
A cette fin, le dispositif de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est essentiellement caractérisé en ce qu'il comprend en outre des organes de guidage et des éléments d'appui, en ce que les organes de guidage comprennent un organe de guidage fixe par rapport au corps et un organe de guidage mobile lié à la bride, ces organes de guidage fixe et mobile coopérant pour entraîner la bride suivant un mouvement de rotation autour de l'axe de pivotement au moins à la fin de sa course vers sa position de relâchement et suivant un mouvement de translation au moins à la fin de sa course vers sa position de serrage, et en ce que les éléments d'appui comprennent un élément d'appui fixe par rapport au corps et un élément d'appui mobile lié à la bride, ces éléments d'appui fixe et mobile coopérant sélectivement, au moins à la fin de la course de la bride vers sa position de serrage, pour s'offrir mutuellement, à distance des organes de guidage, un contact glissant parallèle au mouvement de translation de la bride et permettant un arc-boutement de la bride sur la pièce à serrer.For this purpose, the device of the invention, moreover in conformity with the generic definition given in the preamble above, is essentially characterized by it further comprises guiding members and bearing elements, in that the guiding members comprise a guiding member fixed relative to the body and a movable guiding member connected to the flange, these guiding members. fixed and movable cooperating to drive the flange in a rotational movement about the pivot axis at least at the end of its stroke towards its release position and in a translational movement at least at the end of its stroke to its position in that the support elements comprise a fixed support element relative to the body and a movable support element connected to the flange, these fixed and movable support elements cooperating selectively, at least on the end of the stroke of the flange to its clamping position, to afford each other, away from the guide members, a sliding contact parallel to the translational movement of the flange and allowing a bridging of the flange on the piece to ser rer.
De préférence, la tige s'étend suivant un axe de translation qui passe entre les organes de guidage et les éléments d'appui, cet agencement permettant un équilibrage des forces résistantes au serrage et un auto-blocage très efficace de la bride.Preferably, the rod extends along a translation axis which passes between the guide members and the support elements, this arrangement allowing a balancing of the forces resistant to clamping and a very effective self-locking of the flange.
L'organe de guidage mobile est par exemple constitué par une came formée de deux rainures creusées symétriquement dans la bride de part et d'autre d'un plan médian de la bride et de la tige, transversal à l'axe de pivotement.The movable guide member is for example constituted by a cam formed of two grooves hollowed symmetrically in the flange on either side of a median plane of the flange and the rod, transverse to the pivot axis.
Chaque rainure présente avantageusement un trajet dont des première et seconde extrémités sont respectivement relativement distante et relativement proche de l'axe de pivotement, ce trajet se rapprochant continûment de l'axe de pivotement depuis sa première extrémité vers sa seconde extrémité, et comprenant une portion de trajet rectiligne se terminant à la première extrémité et une portion de trajet courbe, adjacente à la portion de trajet rectiligne et se terminant à la seconde extrémité.Each groove advantageously has a path whose first and second ends are respectively relatively distant and relatively close to the pivot axis, this path approaching continuously the pivot axis from its first end to its second end, and comprising a portion straight pathway terminating at the first end and a curved path portion adjacent to the straight path portion and terminating at the second end.
Grâce à cet agencement, la bride est escamotable de façon totalement automatique.Thanks to this arrangement, the flange is retractable completely automatically.
L'organe de guidage fixe peut alors être constitué par une paire de tétons ou de galets fixés au corps du vérin et respectivement engagés dans les rainures formant la came.The fixed guide member may then be constituted by a pair of pins or rollers attached to the cylinder body and respectively engaged in the grooves forming the cam.
L'élément d'appui mobile est par exemple constitué par un talon d'appui porté par la bride et s'étendant symétriquement de part et d'autre d'un plan médian de la bride et de la tige, transversal à l'axe de pivotement, l'élément d'appui fixe étant alors lui-même constitué par une surface d'appui du corps du vérin, sur laquelle le talon d'appui s'appuie symétriquement par rapport audit plan médian.The movable support element is for example constituted by a bearing heel carried by the flange and extending symmetrically on either side of a median plane of the flange and the rod, transverse to the axis pivoting, the fixed support element then itself being constituted by a bearing surface of the cylinder body, on which the bearing heel bears symmetrically with respect to said median plane.
Dans un mode de réalisation préféré de l'invention, le vérin est un vérin à double effet, par exemple hydraulique, comprenant des première et seconde chambres séparées par un piston solidaire de la tige, la bride étant entraînée de sa position de relâchement vers sa position de serrage par admission de fluide sous pression dans la première chambre du vérin, et étant entraînée de sa position de serrage vers sa position de relâchement par admission de fluide sous pression dans la seconde chambre du vérin.In a preferred embodiment of the invention, the jack is a double-acting jack, for example hydraulic, comprising first and second chambers separated by a piston integral with the rod, the flange being driven from its release position to its clamping position by admission of fluid under pressure into the first chamber of the jack, and being driven from its position clamping to its release position by admission of fluid under pressure in the second chamber of the cylinder.
Dans le cas où la tige sort du vérin du côté de sa première chambre, l'organe de guidage fixe et l'élément d'appui fixe peuvent être portés par une partie du corps du vérin qui est conformée en chape, la bride étant guidée dans son plan médian entre deux faces parallèles en vis-à-vis de cette partie formant chape.In the case where the rod leaves the cylinder on the side of its first chamber, the fixed guide member and the fixed support member may be carried by a portion of the cylinder body which is shaped as a yoke, the flange being guided in its median plane between two parallel faces vis-à-vis this part forming a screed.
En revanche, dans le cas où la tige sort du vérin du côté de sa seconde chambre, la bride est par exemple conformée en chape et enserre le corps du vérin qui la guide dans son plan médian.On the other hand, in the case where the rod leaves the cylinder on the side of its second chamber, the flange is for example shaped as a yoke and encloses the body of the jack which guides it in its median plane.
Dans ces deux cas, chaque téton ou galet est avantageusement situé au-dessus d'un plan transversal à la tige contenant l'axe de pivotement, suivant une direction correspondant au mouvement qu'effectue la tige pour entraîner la bride vers sa position de relâchement.In both cases, each pin or roller is advantageously located above a plane transverse to the rod containing the pivot axis, in a direction corresponding to the movement that the rod makes to drive the flange to its release position .
Un escamotage parfait de la bride peut être obtenu en prévoyant que la bride effectue une rotation au moins égale à 90 degrés entre sa position de serrage et sa position de relâchement.A perfect retraction of the flange can be obtained by providing that the flange rotates at least equal to 90 degrees between its clamping position and its release position.
L'invention concerne également, selon un second de ses aspects, un procédé de commande du dispositif précédemment décrit, ce procédé étant caractérisé en ce qu'il comprend une opération consistant à mesurer la pression du fluide d'actionnement admis dans ce dispositif et à contrôler la position de la bride et / ou l'effort de bridage en vérifiant la valeur de la pression mesurée.The invention also relates, according to a second of its aspects, to a control method of the device previously described, this method being characterized in that it comprises an operation consisting of measuring the pressure of the actuating fluid admitted into this device and check the position of the flange and / or the clamping force by checking the value of the measured pressure.
D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels:
- les figures 1 et 2 sont deux vues en perspective d'un dispositif de serrage conforme à un premier mode de réalisation de l'invention et dont la bride est en position de serrage;
- la figure 3 est une vue en perspective d'un dispositif de serrage conforme à un second mode de réalisation de l'invention et dont la bride est en position de serrage;
- la figure 4 est une vue en coupe partielle du dispositif illustré aux figures 1 et 2 mais dont la bride est en position de relâchement, la coupe étant réalisée suivant un plan parallèle au plan médian de ce dispositif;
- la figure 5 est une vue en coupe du dispositif illustré aux figures 1 et 2, réalisée suivant le plan médian de ce dispositif;
- la figure 6 est une vue en coupe du dispositif illustré aux figures 1 et 2 et complété par une embase formant à la fois distributeur de fluide et support d'intégration du dispositif dans l'outillage, la coupe étant réalisée suivant le plan médian de ce dispositif;
- la figure 7 est une vue de dessus du dispositif illustré aux figures 1 et 2;
- la figure 8 est une vue latérale partielle du dispositif illustré aux figures 1 et 2;
- la figure 9 est une vue latérale du dispositif illustré à la figure 3;
- la figure 10 est une vue de face du dispositif illustré à la figure 3;
- la figure 11 est une vue latérale du dispositif illustré à la figure 3 mais dont la bride est en position de relâchement; et
- la figure 12 est une vue en coupe du dispositif illustré à la figure 3, réalisée suivant le plan médian de ce dispositif.
- Figures 1 and 2 are two perspective views of a clamping device according to a first embodiment of the invention and the flange is in the clamping position;
- Figure 3 is a perspective view of a clamping device according to a second embodiment of the invention and whose flange is in the clamping position;
- FIG. 4 is a partial sectional view of the device illustrated in FIGS. 1 and 2 but whose flange is in the release position, the section being carried out along a plane parallel to the median plane of this device;
- Figure 5 is a sectional view of the device shown in Figures 1 and 2, made along the median plane of this device;
- FIG. 6 is a sectional view of the device illustrated in FIGS. 1 and 2 and completed by a base forming both a fluid distributor and an integration support for the device in the tooling, the section being made along the median plane of this device; device;
- Figure 7 is a top view of the device shown in Figures 1 and 2;
- Figure 8 is a partial side view of the device shown in Figures 1 and 2;
- Figure 9 is a side view of the device shown in Figure 3;
- Figure 10 is a front view of the device shown in Figure 3;
- Figure 11 is a side view of the device shown in Figure 3 but the flange is in the release position; and
- Figure 12 is a sectional view of the device shown in Figure 3, made along the median plane of this device.
Comme annoncé précédemment, l'invention concerne un dispositif pour serrer une pièce P sur un outillage en vue de son usinage, ce dispositif comprenant essentiellement un vérin 1 et une bride 2.As previously announced, the invention relates to a device for clamping a workpiece P on a tool for machining thereof, this device essentially comprising a
Le vérin 1 est par exemple constitué par un vérin hydraulique à double effet et comprend un corps 10 fixé en fonctionnement à l'outillage lui-même disposé dans un centre d'usinage, et une tige 11 mobile par rapport au corps 10 de ce vérin.The
Le corps 10 du vérin présente un alésage à l'intérieur duquel un piston 12, solidaire de la tige 11, délimite deux chambres 101 et 102 de volumes variables et complémentaires, s'ouvrant sur l'extérieur au moyen de ports respectifs 101p et 102p dont chacun peut être relié à une source hydraulique de haute pression pendant que l'autre est relié à un réservoir à basse pression.The
La bride 2, qui est articulée sur la tige 11 autour d'un axe de pivotement X, est entraînée à volonté par la tige 11, elle-même entraînée par le piston 12.The
La bride 2 se débat ainsi, sur une course déterminée, entre une position de serrage illustrée notamment aux figures 1 à 3, et une position de relâchement, illustrée à la figure 4 pour le premier mode de réalisation, et à la figure 11 pour le second mode de réalisation.The
Dans ces conditions, la bride 2 est entraînée de sa position de relâchement vers sa position de serrage par admission de fluide sous pression dans la première chambre 101 du vérin 1, et est entraînée de sa position de serrage vers sa position de relâchement par admission de fluide sous pression dans la seconde chambre 102 de ce vérin 1.Under these conditions, the
Le dispositif de l'invention tire l'essentiel de ses avantages du fait qu'il comprend des organes de guidage 3 et des éléments d'appui 4, les organes de guidage 3 comprenant eux-mêmes un organe de guidage 31 fixe par rapport au corps 10 et un organe de guidage mobile 32 lié à la bride 2, et les éléments d'appui 4 comprenant, de la même façon, un élément d'appui 41 fixe par rapport au corps 10 et un élément d'appui mobile 42 lié à la bride 2.The device of the invention derives most of its advantages from the fact that it comprises
Les organes de guidage fixe et mobile, 31 et 32, coopèrent pour entraîner la bride 2 suivant un mouvement de rotation autour de l'axe de pivotement X au moins à la fin de la course de cette bride vers sa position de relâchement, et pour entraîner la bride 2 suivant un mouvement de translation au moins à la fin de la course de cette bride vers sa position de serrage.The fixed and movable guide members, 31 and 32, cooperate to drive the
De leur côté, les éléments d'appui fixe et mobile, 41 et 42, coopèrent, au moins à la fin de la course de la bride 2 vers sa position de serrage, pour s'offrir mutuellement, à distance des organes de guidage 3, un contact glissant parallèle au mouvement de translation de la bride 2 et permettant un arc-boutement de la bride 2 sur la pièce à serrer P.On their side, the fixed and mobile support elements, 41 and 42, cooperate, at least at the end of the stroke of the
Selon une autre caractéristique importante de l'invention, la tige 11 s'étend de préférence suivant un axe de translation Z qui passe entre les organes de guidage 3 et les éléments d'appui 4.According to another important characteristic of the invention, the
Dans chacun des deux modes de réalisation illustrés, l'organe de guidage mobile 32 est constitué par une came formée de deux rainures, telles que 32a, creusées symétriquement dans la bride 2 de part et d'autre d'un plan médian M du dispositif, ce plan médian M étant transversal à l'axe de pivotement X et constituant un plan de symétrie pour la bride 2 et pour la tige 11.In each of the two embodiments illustrated, the
Outre la rainure 32a, la bride 2 présente donc une rainure 32b qui, bien que non visible sur les figures, se déduit de la rainure 32a par symétrie par rapport au plan M.In addition to the
Chacune des rainures 32a et 32b présente un trajet qui se rapproche continûment de l'axe de pivotement X depuis la première extrémité 321 de ce trajet vers sa seconde extrémité 322.Each of the
Comme le montrent les figures 4, 9, et 11, ce trajet comporte une portion de trajet rectiligne 320r qui se termine à la première extrémité 321 et une portion de trajet courbe 320c, adjacente à la portion de trajet rectiligne 320r et se terminant à la seconde extrémité 322.As shown in FIGS. 4, 9, and 11, this path includes a
L'organe de guidage fixe 31 est quant à lui constitué par une paire de tétons ou de galets, tels que 31a, fixés au corps 10 du vérin 1 et respectivement engagés dans les rainures formant la came.The
Outre le téton ou le galet 31a engagé dans la rainure 32a, le corps 10 présente donc un téton ou un galet 31b engagé dans la rainure 32b et qui, bien que non visible sur les figures, se déduit du téton ou galet 31a par symétrie par rapport au plan médian M.In addition to the stud or the
Comme le montrent les figures 4 et 11, chaque téton ou galet tel que 31a est situé au-dessus d'un plan T qui est transversal à la tige 11 et qui contient l'axe de pivotement X, lorsqu'on suit une direction qui correspond au mouvement qu'effectue la tige 11 pour entraîner la bride 2 vers sa position de relâchement.As shown in Figures 4 and 11, each pin or roller such as 31a is located above a plane T which is transverse to the
L'élément d'appui mobile 42 est constitué par un talon d'appui qui est porté par la bride 2 et qui s'étend symétriquement de part et d'autre du plan médian M du dispositif.The
L'élément d'appui fixe 41 est quant à lui constitué par une surface d'appui externe du corps 10 du vérin 1, sur laquelle le talon d'appui 42 s'appuie symétriquement par rapport à ce même plan médian M.The fixed
Dans le premier mode de réalisation de l'invention, illustré aux figures 1, 2, et 4 à 8, la tige 11 sort du vérin 1 du côté de sa première chambre 101.In the first embodiment of the invention, illustrated in FIGS. 1, 2 and 4 to 8, the
Dans ce cas, l'organe de guidage fixe 31 et l'élément d'appui fixe 41 sont avantageusement portés par une partie 100 du corps 10 du vérin qui est conformée en chape, et la bride 2 est alors guidée dans son plan médian M entre deux faces parallèles en vis-à-vis, 100a et 100b, appartenant à cette partie 100 formant chape.In this case, the fixed
Ce mode de réalisation autorise une rotation importante de la bride 2 entre sa position de serrage et sa position de relâchement, typiquement une rotation d'amplitude égale ou supérieure à 90 degrés.This embodiment allows a large rotation of the
En outre, comme le montre la figure 6, le vérin 1 peut dans ce cas être monté dans une embase 5 fixée sur l'outillage, formant distributeur de fluide, et comprenant donc elle-même deux ports d'entrée-sortie de fluide 101q et 102q correspondant respectivement aux ports 101p et 102p du vérin 1.In addition, as shown in FIG. 6, the
Dans le second mode de réalisation de l'invention, illustré aux figures 3 et 9 à 12, la tige 11 sort du vérin 1 du côté de sa deuxième chambre 102.In the second embodiment of the invention, illustrated in FIGS. 3 and 9 to 12, the
Dans ce cas, c'est de préférence la bride 2 qui est conformée en chape, cette bride enserrant alors le corps 10 du vérin 1, qui la guide dans son plan médian M.In this case, it is preferably the
Pour commander de façon optimale l'actionnement du dispositif précédemment décrit, il est recommandé de mesurer la pression du fluide d'actionnement admis dans ce dispositif, de sorte qu'il est alors possible de contrôler la position de la bride et / ou l'effort de bridage en vérifiant la valeur de la pression mesurée.In order to optimally control the actuation of the device previously described, it is recommended to measure the pressure of the operating fluid admitted in this device, so that it is then possible to control the position of the flange and / or the clamping force by checking the value of the measured pressure.
En particulier, il est donc possible de prévoir que la pression mesurée atteigne ou dépasse un seuil minimal déterminé, typiquement pour éviter que l'effort de bridage ne soit insuffisant, ou de prévoir que la pression mesurée reste en dessous d'un seuil maximal déterminé, par exemple pour éviter que l'effort de bridage ne soit dommageable à la pièce à usiner.In particular, it is therefore possible to provide that the measured pressure reaches or exceeds a determined minimum threshold, typically to prevent the clamping force from being insufficient, or to provide that the measured pressure remains below a maximum threshold determined for example to prevent the clamping force from damaging the workpiece.
Compte tenu de la compressibilité de l'air, ce procédé présente de surcroît l'avantage de permettre un réglage très fin de l'effort de bridage dans le cas où le fluide d'actionnement est constitué par de l'air comprimé.Given the compressibility of the air, this method has the additional advantage of allowing a very fine adjustment of the clamping force in the case where the actuating fluid is constituted by compressed air.
Claims (13)
- Device for clamping a workpiece (P) to a tool, comprising a ram (1) and an arm (2), the ram (1) being selectively actuated by a pressurized fluid and itself comprising a body (10) fixed when in use to the tool and a rod (11) that is movable relative to the body (10), and the arm (2) being hinged to the rod (11) about a pivot axis (X) and selectively driven by the rod (11), which arm (2) executes a defined stroke between a clamping position and a release position and undergoes a rotation for at least a part of its stroke; which device is characterized in that it also includes guide members (3) and bearing elements (4), in that the guide members (3) comprise a guide member (31) that is fixed with respect to the body (10) and a movable guide member (32) that is connected to the arm (2), said fixed and movable guide members (31, 32) acting together to drive the arm (2) through a rotational movement about the pivot axis (X) at least at the end of its stroke towards its release position and through a translational movement at least at the end of its stroke towards its clamping position, and in that the bearing elements (4) comprise a bearing element (41) that is fixed with respect to the body (10) and a movable bearing element (42) that is connected to the arm (2), which fixed and movable bearing elements (41, 42) act together selectively, at least at the end of the stroke of the arm (2) towards its clamping position, to offer each other, at a distance from the guide members (3), a sliding contact parallel to the translational movement of the arm (2), allowing the arm (2) to apply pressure to the workpiece to be clamped (P).
- Clamping device according to Claim 1, characterized in that the rod (11) extends along an axis of translation (Z) as it passes between the guide members (3) and the bearing elements (4).
- Clamping device according to Claim 1 or 2, characterized in that the movable guide member (32) consists of a cam formed by two slots (32a, 32b) formed symmetrically in the arm (2) on either side of a mid-plane (M) of the arm and of the rod, lying transversely to the pivot axis (X).
- Clamping device according to any one of the preceding claims combined with Claim 3, characterized in that each slot (32a, 32b) defines a path whose first and second ends (321, 322) are respectively relatively distant from and relatively close to the pivot axis (X), this path continually approaching the pivot axis (X) from its first end (321) to its second end (322), and comprising a straight path portion (320r) ending at the first end (321) and a curved path portion (320c) adjacent to the straight path portion (320r) and ending at the second end (322).
- Clamping device according to any one of the preceding claims combined with Claim 3, characterized in that the fixed guide member (31) consists of two nipples or rollers (31a, 31b) fixed to the body (10) of the ram (1), each engaged in its respective cam slot (32a, 32b).
- Clamping device according to any one of the preceding claims, characterized in that the movable bearing element (42) consists of a bearing projection (42) on the arm (2) and extends symmetrically either side of a mid-plane (M) of the arm and of the rod, transversely to the pivot axis (X), and in that the fixed bearing element (41) consists of a bearing surface (41) of the body (10) of the ram (1), on which surface the bearing projection (42) bears symmetrically about said mid-plane (M).
- Clamping device according to any one of the preceding claims, characterized in that the ram (1) is a double-acting ram comprising first and second chambers (101, 102) separated by a piston (12) mounted on the rod (11), the arm (2) being driven from its release position to its clamping position by the admission of pressurized fluid into the first chamber (101) of the ram (1), and being driven from its clamping position to its release position by the admission of pressurized fluid into the second chamber (102) of the ram (1).
- Clamping device according to Claim 7, characterized in that the ram (1) is a hydraulic ram.
- Clamping device according to either of Claims 7 and 8, characterized in that the rod (11) passes out of the ram (1) through its first chamber (101) and in that the fixed guide member (31) and the fixed bearing element (41) are supported by a yoke-shaped part (100) of the ram body (10), the arm (2) being guided in its mid-plane (M) between two opposing parallel faces (100a, 100b) of this yoke part (100).
- Clamping device according to either of Claims 7 and 8, characterized in that the rod (11) passes out of the ram (1) through its second chamber (102) and in that the arm (2) is yoke-shaped and grasps the body (10) of the ram (1), which guides it in its mid-plane (M).
- Clamping device according to any one of the preceding claims combined with Claim 5, characterized in that each nipple or roller (31a, 31b) is situated above a plane (T) lying transversely to the rod (11) containing the pivot axis (X), in a direction corresponding to the movement described by the rod (11) in driving the arm (2) towards its release position.
- Clamping device according to any one of the preceding claims, characterized in that the arm (2) describes a rotation of at least 90 degrees between its clamping position and its release position.
- Method of controlling the device according to any one of the preceding claims, characterized in that it comprises an operation of measuring the pressure of the actuating fluid admitted into this device and monitoring the position of the arm and/or the clamping force by ascertaining the value of the measured pressure.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0314358A FR2863190B1 (en) | 2003-12-04 | 2003-12-04 | PRECISE CLAMPING DEVICE WITH QUICK ACTUATION |
PCT/FR2004/003124 WO2005056241A1 (en) | 2003-12-04 | 2004-12-03 | Quick clamping device and control method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1697088A1 EP1697088A1 (en) | 2006-09-06 |
EP1697088B1 true EP1697088B1 (en) | 2007-05-23 |
Family
ID=34586368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04805643A Active EP1697088B1 (en) | 2003-12-04 | 2004-12-03 | Quick clamping device and control method |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1697088B1 (en) |
AT (1) | ATE362827T1 (en) |
DE (1) | DE602004006647T2 (en) |
ES (1) | ES2287803T3 (en) |
FR (1) | FR2863190B1 (en) |
WO (1) | WO2005056241A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022238527A1 (en) | 2021-05-14 | 2022-11-17 | Christophe Boiteux | Clamping device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009107076A (en) | 2007-10-31 | 2009-05-21 | Smc Corp | Clamp device |
FR2989297B1 (en) * | 2012-04-12 | 2015-03-13 | Christophe Boiteux | DEVICE FOR CLAMPING A PIECE ON A TOOL |
FR3023738B1 (en) | 2014-07-17 | 2016-07-29 | Christophe Boiteux | ANGULAR HOLDING SYSTEM WITH USE OF REFRIGERATED CORNER |
FR3039447B1 (en) * | 2015-07-31 | 2017-08-25 | Christophe Boiteux | DEVICE FOR CLAMPING A PIECE ON A TOOL |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3482830A (en) * | 1966-04-05 | 1969-12-09 | Jack J Sendoykas | Clamp |
US3618931A (en) * | 1970-01-19 | 1971-11-09 | Leland F Blatt | Cam wedge power clamp |
US4494739A (en) * | 1983-03-04 | 1985-01-22 | State Die & Engineering, Inc. | Power operated rotatable clamping assembly |
US6115898A (en) * | 1995-06-06 | 2000-09-12 | Btm Corporation | Force multiplying apparatus for clamping a workpiece and forming a joint therein |
US6059277A (en) * | 1998-05-05 | 2000-05-09 | Btm Corporation | Retracting power clamp |
-
2003
- 2003-12-04 FR FR0314358A patent/FR2863190B1/en not_active Expired - Fee Related
-
2004
- 2004-12-03 ES ES04805643T patent/ES2287803T3/en active Active
- 2004-12-03 WO PCT/FR2004/003124 patent/WO2005056241A1/en active IP Right Grant
- 2004-12-03 EP EP04805643A patent/EP1697088B1/en active Active
- 2004-12-03 AT AT04805643T patent/ATE362827T1/en not_active IP Right Cessation
- 2004-12-03 DE DE602004006647T patent/DE602004006647T2/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022238527A1 (en) | 2021-05-14 | 2022-11-17 | Christophe Boiteux | Clamping device |
FR3122843A1 (en) | 2021-05-14 | 2022-11-18 | Christophe Boiteux | clamping device |
Also Published As
Publication number | Publication date |
---|---|
DE602004006647T2 (en) | 2008-01-31 |
EP1697088A1 (en) | 2006-09-06 |
FR2863190B1 (en) | 2006-02-03 |
WO2005056241A1 (en) | 2005-06-23 |
FR2863190A1 (en) | 2005-06-10 |
ES2287803T3 (en) | 2007-12-16 |
ATE362827T1 (en) | 2007-06-15 |
DE602004006647D1 (en) | 2007-07-05 |
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