EP2836336B1 - Device for clamping a workpiece on a tool - Google Patents

Device for clamping a workpiece on a tool Download PDF

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Publication number
EP2836336B1
EP2836336B1 EP13720455.8A EP13720455A EP2836336B1 EP 2836336 B1 EP2836336 B1 EP 2836336B1 EP 13720455 A EP13720455 A EP 13720455A EP 2836336 B1 EP2836336 B1 EP 2836336B1
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EP
European Patent Office
Prior art keywords
flange
clamping device
fixed
rod
piston
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.)
Active
Application number
EP13720455.8A
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German (de)
French (fr)
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EP2836336A1 (en
Inventor
Christophe Boiteux
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to RS20160899A priority Critical patent/RS55268B1/en
Priority to SI201330352A priority patent/SI2836336T1/en
Publication of EP2836336A1 publication Critical patent/EP2836336A1/en
Application granted granted Critical
Publication of EP2836336B1 publication Critical patent/EP2836336B1/en
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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
    • B25B5/061—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
    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/494—Fluidic or fluid actuated device making

Definitions

  • the invention relates to a device for clamping a workpiece on a tool, of the type comprising a flange actuated by a jack, which retracts and moves linearly in the clamping phase.
  • Such a clamping device is known from the document FR 2 863 190 patent application filed by the present inventor.
  • This device comprises a body having a lower portion of cylindrical shape and a top portion in the form of a yoke.
  • a flange is mounted movably between the two wings of the yoke and is actuated by the rod of a jack housed in the lower part.
  • the flange is struggling between a clamping position and a releasing position.
  • the movement of the clamping position towards the release position comprises a first phase of translation parallel to the axis of the jack followed by a phase of rotation to clear access to the tool to remove the piece and to place another one.
  • the movement from the release position to the clamping position follows the same path, in the opposite direction to the previous one.
  • the flange In the positions of the translational phase, the flange is guided by bearing elements formed by heels of the flange and bearing surfaces of the wings of the yoke. It is also guided by a pivot at the end of the stem.
  • the geometry of the triangle formed by the axis of the pivot, the support elements and the point of contact of the flange on the part determines the amplification of the forces applied to the part and which are transmitted in the form of a couple between the pivot and the support elements.
  • Such a device gives complete satisfaction, in particular in terms of speed of actuation and compactness, when the point of support on the part can be close to the device.
  • this support point is away from the clamping device, due to the constraints of the geometry of the part.
  • This is possible by an elongation of the flange, but such elongation increases the stresses on the pivot and the support elements or limits the clamping force if said constraints can not increase.
  • this elongation results in a larger footprint in the release position. Indeed, the flange has rotated about a quarter of a turn upwards and its length is added to that of the body in the direction of the cylinder.
  • a possible solution to increase the allowable forces is to move the support elements from the position of the pivot in the clamping position. This amounts to increasing the length of the body and the height of the flange, which increases the size of the device both in the clamping position and release position. This solution is therefore not optimal because of this overcrowding.
  • the object of the invention is to provide a compact tooling device which is compact, fast and powerful even if the clamping point has to be moved away.
  • the subject of the invention is a device for clamping a workpiece on a tool, comprising a jack and a flange, the jack being selectively actuated by a fluid under pressure and itself comprising a body intended for to be fixed to the tooling and a slide slidably mounted relative to the body, the flange being hinged about an axis of pivoting on the slide, the body having a front face beyond which the flange protrudes when in a clamping position to clamp the workpiece, the flange also having a release position that it at least partially reaches by a pivoting around the pivot axis, the device comprising guide members which comprise a guide member fixed relative to the body and a movable guide member connected to the flange cooperating with each other to drive the flange in a rotational movement around the pivot axis at least at the end of the stroke towards the releasing position and in a translational movement at least at the end of the stroke towards the clamping position, the device being characterized
  • the rotation during the release phase makes it possible to quickly release the flange to allow access to the workpiece on the tooling, to unload it and to load a new one in a direct movement along the front face.
  • This succession of movements is obtained with a simple command by a single cylinder.
  • the finger has the shape of a pin or a roller and is fixed on the flange at a distance from the pivot axis. If the groove was made on the flange, it would have the disadvantage of weakening the section of it.
  • the body can be made with a strong section that is not affected too much by the groove.
  • the groove extends along a path of which a first portion is parallel to the direction of translation of the flange and a second portion is oriented obliquely with respect to the first portion, the finger being in the first portion when the flange is in the clamping position or in the vicinity and in the second portion when the flange is pivoted.
  • the finger By acting on the finger during its movement in the groove, thus guides the movement of the flange, in particular to control the pivoting to the release position and the translation to the clamping position.
  • the relative position of the pivot axis and the roller is not changed, and the flange retains the same orientation, which determines a translational movement.
  • the roller is in the second portion of the groove, the relative position of the pivot axis and the finger is changed, and the flange pivots on the pivot axis.
  • the finger is located at a distance from the pivot axis, distant in the direction of translation of the rod from the clamping position to the release position. It is found that this arrangement is easier to achieve, leaving the space between the pivot axis and the cylinder rod without constraint to limit the length of the rod.
  • the slide comprises a piston and a rod joined together and the pivot axis is offset by a predetermined distance from the axis of the rod towards the front face.
  • the pivot axis is offset by a predetermined distance from the axis of the rod towards the front face.
  • the piston and the rod are assembled by screwing into one another.
  • the body comprises a plug for closing a cylinder chamber delimited by the piston and a bore of the body in which the piston slides.
  • the cylinder can be mounted by inserting the piston into the bore, assembling it with the rod, and then closing the bore with the plug to create the cylinder chamber.
  • the clamping device comprises upper support elements, the upper support elements comprising an upper stationary support element fixed with respect to the body, and an upper movable support element connected to the bracket. , the upper elements of fixed and movable support cooperating, at least at the end of the stroke of the flange to the clamping position, to offer each other a sliding contact parallel to the translational movement of the flange and to oppose the pivoting the flange to the release position. Direct transmission of forces is thus achieved between the flange and the body of the flange, which ensures good rigidity and good ability to cash the clamping forces.
  • the clamping device comprises lower support elements comprising a lower fixed support element, fixed relative to the body, and a lower movable support element connected to the rod, the lower elements of fixed and movable support cooperating, at least at the end of travel of the flange to the clamping position, to offer each other a sliding contact parallel to the translational movement of the flange.
  • the lower bearing elements for taking up forces transmitted by the flange during clamping via the rod.
  • the movable lower bearing element is at the pivot axis of the flange, so that the forces are transmitted without generating torque on the rod.
  • the clamping device comprises a detection duct opening on the upper fixed support element and intended to be connected in fluid communication with a leakage detection device fluid.
  • a detection duct opening on the upper fixed support element When the flange is in the clamping position, the upper fixed support member is in contact with the upper movable support element, which closes the outlet of the detection duct. There is thus a very compact element to detect the closing or opening of the flange.
  • the fluid used is typically air. It is also possible to provide a particular shape on the movable support element so that the detection takes place only in a very precise position range.
  • the invention also relates to a method of mounting a clamping device as described above, wherein the rod is placed on the body to make it open into the body, and the piston is assembled on the opening portion of the rod.
  • a clamping device is intended to clamp a workpiece on a tool.
  • the device comprises a body 1 fixed on the tool, for example by means of a collar 10 screwed onto the tooling.
  • the body 1 essentially comprises a cylindrical portion 11 on one side of the flange 10, and a clevis-shaped portion 12 opposite the cylindrical portion 11.
  • the bottom of the device is the cylindrical portion 11 and the top is the clevis 12.
  • the device can be mounted on the tool in any orientation.
  • the clamping device further comprises a flange 2 mounted between two flanges 120 of the yoke 12.
  • the flange 2 comprises an arm 20 at the end of which a fulcrum is intended to clamp the workpiece.
  • the flange 2 has a clamping position in which it protrudes beyond a front face 13 of the body 1 and in which it is capable of clamping the workpiece on the tool, as shown in FIGS. figures 1 , 4 and 6 . It also has a release position in which the front face 13 is completely unobstructed upwards and the arm 20 is raised, as shown in particular by figures 2 and 7 .
  • the flange 2 then protrudes upwards.
  • a jack 3 is housed in the cylindrical portion 11. It comprises a bore 31 formed in the body 1 and wherein a slider 32 is slidably mounted. A plug 33 closes the bore 31 by being screwed on the outside of the cylindrical portion 11 of the body 1.
  • the slide 32 is divided into two parts assembled together: a piston 321 and a rod 322.
  • the piston 321 has the shape a disc which protrudes a threaded portion 3210 placed in the center of the disc.
  • the rod 322 comprises a threaded sleeve 3221, followed by a smooth portion 3222 and a foot 3223 wider than the smooth portion 3222.
  • the smooth portion 3222 is slidably fitted in a neck 14 of the body 1, succeeding the bore 31 while the foot 3223 is located beyond the neck 14, in the space between the wings 120 of the yoke 12.
  • the threaded portion 3210 is screwed into the sleeve 3221 of the rod 322.
  • a first chamber 35 is delimited in the bore 31 between the piston 321 and the cover 33 while a second chamber 36 is defined between said piston 321 and the neck 14.
  • the cylindrical portion 11 has outside two distribution grooves 113, 114, little deep. Each distribution groove 113, 114 is in communication with one of the chambers 35, 36 of the cylinder 3 via a supply duct 1130, 1140 respectively.
  • Sealing grooves are provided on both sides of the distribution grooves in order to isolate them when the body 1 of the device is placed in a cylindrical housing of the tool, not shown.
  • Two channels are provided opening into the housing opposite the distribution grooves to supply the cylinder 3 with a fluid under pressure such as oil or air through the distribution grooves 113, 114 and ducts feed 1130, 1140.
  • the flange 2 is hinged about a pivot axis A on the foot 3223 of the slider 32. Due to the shape of the foot 3223, it is possible to shift the pivot axis A relative to the axis of the slider 32 , such that it is for example offset in the direction of the front face 13 by a value close to the radius of the smooth portion 3222 of the rod 322.
  • the flange 2 reaches the release position by pivoting around the pivot axis A.
  • the movement of the flange 2 further comprises a sliding phase given by the sliding of the piston 321.
  • the flange 2 comprises a flange clevis 21 having two flanges 210 which surround the foot 3223.
  • the axis pivoting A is formed by a pin 22 passing through the wings 120 of the flange clevis 21 and the foot 3223.
  • the device comprises guide members which comprise a fixed guide member 15 relative to the body 1 and a movable guide member 16 connected to the flange 2 cooperating with each other to cause the pivoting of the flange 2 around the pivot axis At the end of the race towards the release position.
  • the guide members 15, 16 also require a translational movement at the end of the stroke towards the clamping position.
  • the fixed guide member 15 is formed by two grooves 150 made respectively in the wings 120 of the clevis 12 in a through manner.
  • the groove 150 extends along a path of which a first portion 1501 is parallel to the direction of translation of the flange 2 and a second portion 1502 is oriented obliquely with respect to the first portion 1501, substantially at 90 °.
  • the second portion 1502 is oriented towards the rear, opposite the front face 13.
  • the two portions are connected by a curved portion.
  • the groove 150 is extended downward to create a passage 1503 facing the pivot axis A when the flange 2 is in the clamping position. This passage allows the introduction of the pin 22 during assembly of the device.
  • the movable guide member is a finger 16 in the form of a stud.
  • the stud 16 is screwed onto the flange 2 and has a cylindrical head of a diameter adjusted to the width of the groove 150.
  • the stud 16 is placed above the pivot axis A.
  • the clamping device furthermore comprises upper support elements 4 and lower support elements 5.
  • the upper support elements 4 comprise an upper fixed support element 41, fixed with respect to the body 1, and an element upper movable support member 42 is connected to the flange 2.
  • the upper fixed support element 41 is formed by two substantially vertical bearing surfaces on the front side of the wings 120 of the yoke 12.
  • the upper movable support element 42 comprises two heels protruding from the faces of the flange 2 and providing two vertical bearing surfaces when the flange 2 is in the clamping position.
  • the upper fixed and movable support elements 41, 42 cooperate at the end of the stroke of the flange 2 to the clamping position, to offer each other a sliding contact parallel to the translational movement of the flange 2 and s opposing the pivoting of the flange 2 towards the release position.
  • the lower support elements 5 comprise a lower fixed support element 51, fixed with respect to the 1, and a lower movable support member 52 connected to the rod 322.
  • the lower fixed support member 51 has the shape of a rib placed along the foot 3223 of the rod 322 between the wings 120 of the
  • the lower movable support element 52 has a bearing surface carried by the foot 3223 facing the rib 51.
  • the lower fixed and movable support elements 51, 52 cooperate at the end of the run from the flange 2 to the clamping position to offer each other a sliding contact parallel to the translational movement of the flange 2.
  • the flange 2 In cooperation with the upper support members 4, the flange 2 is retained very rigidly when it is placed in abutment against a workpiece to be clamped, with support planes that oppose the torque generated by the contact of the flange 2 on the workpiece in front of the device.
  • a detection duct 19 is provided opening onto the upper fixed support element 41, as shown in FIG. figure 5 and intended to be connected in fluid communication with a fluid leak detection device.
  • the detection duct 19 comprises a connecting section opening into a detection groove 115, between the flange 10 and the sealing groove closest to the flange 10.
  • the upper movable support member comprises a notch which is opposite the outlet of the detection duct 19 when the flange is at the end of travel towards the clamping position. It can therefore be considered that the flange was not stopped by the part to be clamped, and therefore that the part is absent in this position.
  • the flange 2 is actuated by sending a fluid under pressure into the first chamber 35.
  • the fluid from the second chamber 36 escapes and allows the piston 321 to rise.
  • the flange 2, driven by the foot 3223, also rises with a movement translation, further guided by the finger 16 which circulates in the first portion 1501 of the grooves 150.
  • the finger 16 When the finger 16 reaches the end of the first portion 1501, the upper bearing elements 4 are disengaged one of the other.
  • the finger engages in the second portion 1502 of the groove 150, which causes the pivoting of the flange 2 around the pivot axis A on the foot 3223 of the cylinder 3 in the direction of the arrow F1.
  • the movable upper support element passes over the yoke 12.
  • the flange 2 then reaches the release position in which it does not protrude beyond the front face 13, but in which the arm 20 is placed above the clevis 12 pointing upwards.
  • the space in front of the device is then cleared to remove and set up a
  • the actuator 3 is actuated in the opposite direction, that is to say that the pressurized fluid is sent into the second chamber 36 and allows it to escape from the first chamber 35.
  • the piston 321 then begins a downward movement.
  • the finger 16 is then forced to traverse the groove 150 in the second portion 1502, which causes the pivoting of the flange 2 to the opposite of the arrow F1, that is to say to a lowering of the arm 20 above the piece beyond the front face 13.
  • the piston 321 continues its sliding stroke by driving the flange 2 downwards.
  • the upper support elements engage in facing.
  • the flange 2 When the arm 20 comes into contact with the part at the point of support and exerts a clamping force on it, the flange 2 bears against the yoke 12 at the level of the upper bearing elements 4. It also tends to to press the rod 322 of the cylinder 3 against the rib at the lower bearing elements 5. The flange 2 is thus rigidly held in abutment on the part.
  • a clamping device is distinguished from the device according to the first embodiment in that the slider 32 'is made in one piece comprising the rod 322' and the piston 321 '.
  • the rod 322 'of the slider is introduced into the neck 14', passing through the chamber of the jack.
  • the journal 22 is then put in place to assemble the rod 322 'with the flange 2'.
  • the lid 33 ' is screwed onto the body 1' to close the chamber 35 'of the jack.
  • the operation of the device is the same as for the first embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention concerne un dispositif de serrage d'une pièce sur un outillage, du genre comportant une bride actionnée par un vérin, qui s'escamote et qui se déplace linéairement dans la phase de serrage.The invention relates to a device for clamping a workpiece on a tool, of the type comprising a flange actuated by a jack, which retracts and moves linearly in the clamping phase.

TECHNIQUE ANTÉRIEUREPRIOR ART

On connaît un tel dispositif de serrage par le document FR 2 863 190 , demande de brevet déposée par le présent inventeur. Ce dispositif comporte un corps comportant une partie inférieure de forme cylindrique et une partie supérieure en forme de chape. Une bride est montée mobile entre les deux ailes de la chape et est actionnée par la tige d'un vérin logé dans la partie inférieure. La bride se débat entre une position de serrage et une position de relâchement. Le mouvement de la position de serrage vers la position de relâchement comporte une première phase de translation parallèle à l'axe du vérin suivi d'une phase de rotation pour dégager l'accès à l'outillage afin d'enlever la pièce et d'en placer une autre. Le mouvement de la position de relâchement vers la position de serrage suit la même trajectoire, en sens inverse de la précédente.Such a clamping device is known from the document FR 2 863 190 patent application filed by the present inventor. This device comprises a body having a lower portion of cylindrical shape and a top portion in the form of a yoke. A flange is mounted movably between the two wings of the yoke and is actuated by the rod of a jack housed in the lower part. The flange is struggling between a clamping position and a releasing position. The movement of the clamping position towards the release position comprises a first phase of translation parallel to the axis of the jack followed by a phase of rotation to clear access to the tool to remove the piece and to place another one. The movement from the release position to the clamping position follows the same path, in the opposite direction to the previous one.

Dans les positions de la phase de translation, la bride est guidée par des éléments d'appui réalisés par des talons de la bride et des surfaces d'appui des ailes de la chape. Elle est également guidée par un pivot à l'extrémité de la tige. La géométrie du triangle formé par l'axe du pivot, les éléments d'appui et le point de contact de la bride sur la pièce détermine l'amplification des efforts appliqués sur la pièce et qui sont transmis sous la forme d'un couple entre le pivot et les éléments d'appui.In the positions of the translational phase, the flange is guided by bearing elements formed by heels of the flange and bearing surfaces of the wings of the yoke. It is also guided by a pivot at the end of the stem. The geometry of the triangle formed by the axis of the pivot, the support elements and the point of contact of the flange on the part determines the amplification of the forces applied to the part and which are transmitted in the form of a couple between the pivot and the support elements.

Un tel dispositif donne entièrement satisfaction, en particulier en termes de rapidité d'actionnement et de compacité, lorsque le point d'appui sur la pièce peut être à proximité du dispositif. Cependant, dans certaines configurations, il est souhaitable, voire indispensable, que ce point d'appui soit éloigné du dispositif de serrage, du fait des contraintes de la géométrie de la pièce. Ceci est possible par un allongement de la bride, mais un tel allongement augmente les contraintes sur le pivot et les éléments d'appui ou limite l'effort de serrage si lesdites contraintes ne peuvent pas augmenter. De plus, cet allongement se traduit par un encombrement plus important dans la position de relâchement. En effet, la bride a pivoté d'environ un quart de tour vers le haut et sa longueur s'additionne à celle du corps dans la direction du vérin.Such a device gives complete satisfaction, in particular in terms of speed of actuation and compactness, when the point of support on the part can be close to the device. However, in some configurations, it is desirable, even essential, that this support point is away from the clamping device, due to the constraints of the geometry of the part. This is possible by an elongation of the flange, but such elongation increases the stresses on the pivot and the support elements or limits the clamping force if said constraints can not increase. In addition, this elongation results in a larger footprint in the release position. Indeed, the flange has rotated about a quarter of a turn upwards and its length is added to that of the body in the direction of the cylinder.

Une solution possible pour augmenter les efforts admissibles est d'éloigner les éléments d'appui de la position du pivot dans la position de serrage. Ceci revient à augmenter la longueur du corps et la hauteur de la bride, ce qui augmente l'encombrement du dispositif à la fois en position de serrage et en position de relâchement. Cette solution n'est donc pas optimale à cause de cet encombrement trop important.A possible solution to increase the allowable forces is to move the support elements from the position of the pivot in the clamping position. This amounts to increasing the length of the body and the height of the flange, which increases the size of the device both in the clamping position and release position. This solution is therefore not optimal because of this overcrowding.

OBJECTIFS DE L'INVENTIONOBJECTIVES OF THE INVENTION

L'invention vise à fournir un dispositif de serrage de pièce pour outillage qui soit compact, rapide et puissant, même si le point de serrage doit être éloigné.The object of the invention is to provide a compact tooling device which is compact, fast and powerful even if the clamping point has to be moved away.

EXPOSÉ DE L'INVENTIONSTATEMENT OF THE INVENTION

Avec ces objectifs en vue, l'invention a pour objet 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 destiné à être fixé à l'outillage et un coulisseau monté coulissant par rapport au corps, la bride étant articulée autour d'un axe de pivotement sur le coulisseau, le corps comportant une face avant au-delà de laquelle la bride fait saillie lorsqu'elle est dans une position de serrage pour serrer la pièce, la bride ayant également une position de relâchement qu'elle atteint au moins partiellement par un pivotement autour de l'axe de pivotement, le dispositif comportant des organes de guidage qui comprennent un organe de guidage fixe par rapport au corps et un organe de guidage mobile lié à la bride coopérant entre eux pour entraîner la bride suivant un mouvement de rotation autour de l'axe de pivotement au moins à la fin de la course vers la position de relâchement et suivant un mouvement de translation au moins à la fin de la course vers la position de serrage, le dispositif étant caractérisé en ce que l'organe de guidage fixe comporte au moins une rainure creusée dans le corps et l'organe de guidage mobile comporte au moins un doigt engagé dans la rainure.With these objectives in view, the subject of the invention is a device for clamping a workpiece on a tool, comprising a jack and a flange, the jack being selectively actuated by a fluid under pressure and itself comprising a body intended for to be fixed to the tooling and a slide slidably mounted relative to the body, the flange being hinged about an axis of pivoting on the slide, the body having a front face beyond which the flange protrudes when in a clamping position to clamp the workpiece, the flange also having a release position that it at least partially reaches by a pivoting around the pivot axis, the device comprising guide members which comprise a guide member fixed relative to the body and a movable guide member connected to the flange cooperating with each other to drive the flange in a rotational movement around the pivot axis at least at the end of the stroke towards the releasing position and in a translational movement at least at the end of the stroke towards the clamping position, the device being characterized in that fixed guide comprises at least one groove dug in the body and the movable guide member comprises at least one finger engaged in the groove.

Du fait du mouvement de translation lors de la phase de serrage, la pièce est bien serrée sans qu'un mouvement de glissement ne soit induit. Par contre, la rotation pendant la phase de relâchement permet de dégager rapidement la bride pour laisser un accès à la pièce sur l'outillage, pour la décharger et en charger une nouvelle dans un mouvement direct le long de la face avant. Cette succession de mouvements est obtenue avec une commande simple par un seul vérin. Le doigt a la forme d'un téton ou d'un galet et est fixé sur la bride à distance de l'axe de pivotement. Si la rainure était réalisée sur la bride, elle aurait le désavantage d'affaiblir la section de celle-ci. Dans l'invention, le corps peut être réalisé avec une forte section qui n'est pas trop affectée par la rainure.Due to the translational movement during the clamping phase, the workpiece is tight without sliding movement being induced. On the other hand, the rotation during the release phase makes it possible to quickly release the flange to allow access to the workpiece on the tooling, to unload it and to load a new one in a direct movement along the front face. This succession of movements is obtained with a simple command by a single cylinder. The finger has the shape of a pin or a roller and is fixed on the flange at a distance from the pivot axis. If the groove was made on the flange, it would have the disadvantage of weakening the section of it. In the invention, the body can be made with a strong section that is not affected too much by the groove.

De manière particulière, la rainure s'étend selon un trajet dont une première portion est parallèle à la direction de translation de la bride et une deuxième portion est orientée obliquement par rapport à la première portion, le doigt se situant dans la première portion lorsque la bride est dans la position de serrage ou à proximité et dans la deuxième portion lorsque la bride est entraînée en pivotement. En agissant sur le doigt lors de son déplacement dans la rainure, on guide ainsi le mouvement de la bride, en particulier pour commander le pivotement vers la position de relâchement et la translation vers la position de serrage. Lorsque le doigt est dans la première portion de la rainure, la position relative de l'axe de pivotement et du galet n'est pas modifiée, et la bride conserve la même orientation, ce qui détermine un mouvement de translation. Par contre, lorsque le galet est dans la deuxième portion de la rainure, la position relative de l'axe de pivotement et du doigt est modifiée, et la bride pivote sur l'axe de pivotement.In particular, the groove extends along a path of which a first portion is parallel to the direction of translation of the flange and a second portion is oriented obliquely with respect to the first portion, the finger being in the first portion when the flange is in the clamping position or in the vicinity and in the second portion when the flange is pivoted. By acting on the finger during its movement in the groove, thus guides the movement of the flange, in particular to control the pivoting to the release position and the translation to the clamping position. When the finger is in the first portion of the groove, the relative position of the pivot axis and the roller is not changed, and the flange retains the same orientation, which determines a translational movement. By cons, when the roller is in the second portion of the groove, the relative position of the pivot axis and the finger is changed, and the flange pivots on the pivot axis.

Selon une disposition constructive, le doigt est situé à distance de l'axe de pivotement, éloigné dans le sens de la translation de la tige de la position de serrage vers la position de relâchement. On constate que cette disposition est plus facile à réaliser, en laissant l'espace entre l'axe de pivotement et la tige de vérin sans contrainte pour limiter la longueur de la tige.According to a constructive arrangement, the finger is located at a distance from the pivot axis, distant in the direction of translation of the rod from the clamping position to the release position. It is found that this arrangement is easier to achieve, leaving the space between the pivot axis and the cylinder rod without constraint to limit the length of the rod.

Selon une autre caractéristique, le coulisseau comporte un piston et une tige solidarisés par assemblage et l'axe de pivotement est décalé d'une distance prédéterminée par rapport à l'axe de la tige en direction de la face avant. En déplaçant l'axe de pivotement en direction de la pièce à serrer, on diminue tout d'abord la distance entre le point de pivotement et le point d'appui sur la pièce. On augmente ainsi l'effort qui peut être appliqué sur la pièce. Par ailleurs, la position de relâchement de la bride est ainsi décalée vers la pièce, ce qui diminue l'encombrement dans la direction opposée à la pièce. De plus, la distance entre l'extrémité de la bride et celle de l'axe de pivotement diminue, ce qui diminue également l'encombrement en hauteur du dispositif en position de relâchement, pour une distance déterminée entre le corps du dispositif et le point d'appui sur la pièce. Le déport important de l'axe de pivotement est possible grâce à la réalisation du coulisseau en deux pièces. En effet, la taille de la partie supérieure du coulisseau n'est pas limitée au diamètre de passage de la tige dans le corps, mais peut être supérieure.According to another characteristic, the slide comprises a piston and a rod joined together and the pivot axis is offset by a predetermined distance from the axis of the rod towards the front face. By moving the pivot axis towards the workpiece to be clamped, the distance between the pivot point and the point of support on the workpiece is first reduced. This increases the effort that can be applied to the workpiece. Furthermore, the release position of the flange is thus shifted towards the workpiece, which reduces the bulk in the direction opposite to the workpiece. In addition, the distance between the end of the flange and that of the pivot axis decreases, which also reduces the overall height of the device in the release position, for a determined distance between the body of the device and the point of support on the workpiece. The important offset of the pivot axis is possible thanks to the realization of the slide in two parts. Indeed, the size of the upper part of the slider is not limited to the diameter of passage of the rod in the body, but can be greater.

De manière particulière, le piston et la tige sont assemblés par vissage l'un dans l'autre.In particular, the piston and the rod are assembled by screwing into one another.

Selon une disposition constructive, le corps comporte un bouchon pour fermer une chambre de vérin délimitée par le piston et un alésage du corps dans laquelle le piston coulisse. Le vérin peut être monté en introduisant le piston dans l'alésage, en l'assemblant avec la tige, puis en obturant l'alésage avec le bouchon pour créer la chambre de vérin.According to a constructive arrangement, the body comprises a plug for closing a cylinder chamber delimited by the piston and a bore of the body in which the piston slides. The cylinder can be mounted by inserting the piston into the bore, assembling it with the rod, and then closing the bore with the plug to create the cylinder chamber.

Selon une autre caractéristique, le dispositif de serrage comporte des éléments d'appui supérieurs, les éléments d'appui supérieurs comprenant un élément d'appui fixe supérieur, fixe par rapport au corps, et un élément d'appui mobile supérieur lié à la bride, les éléments supérieurs d'appui fixe et mobile coopérant, au moins à la fin de la course de la bride vers la position de serrage, pour s'offrir mutuellement un contact glissant parallèle au mouvement de translation de la bride et s'opposer au pivotement de la bride vers la position de relâchement. Une transmission directe des efforts est ainsi réalisée entre la bride et le corps de la bride, ce qui assure une bonne rigidité et une bonne capacité à encaisser les efforts de serrage.According to another characteristic, the clamping device comprises upper support elements, the upper support elements comprising an upper stationary support element fixed with respect to the body, and an upper movable support element connected to the bracket. , the upper elements of fixed and movable support cooperating, at least at the end of the stroke of the flange to the clamping position, to offer each other a sliding contact parallel to the translational movement of the flange and to oppose the pivoting the flange to the release position. Direct transmission of forces is thus achieved between the flange and the body of the flange, which ensures good rigidity and good ability to cash the clamping forces.

De manière complémentaire, le dispositif de serrage comporte des éléments d'appui inférieurs comprenant un élément d'appui fixe inférieur, fixe par rapport au corps, et un élément d'appui mobile inférieur lié à la tige, les éléments inférieurs d'appui fixe et mobile coopérant, au moins à la fin de course de la bride vers la position de serrage, pour s'offrir mutuellement un contact glissant parallèle au mouvement de translation de la bride. Les éléments d'appui inférieurs permettant de reprendre des efforts transmis par la bride lors du serrage par l'intermédiaire de la tige. De préférence, l'élément d'appui inférieur mobile est au niveau de l'axe de pivotement de la bride, de manière à ce que les efforts soient transmis sans générer de couple sur la tige.In a complementary manner, the clamping device comprises lower support elements comprising a lower fixed support element, fixed relative to the body, and a lower movable support element connected to the rod, the lower elements of fixed and movable support cooperating, at least at the end of travel of the flange to the clamping position, to offer each other a sliding contact parallel to the translational movement of the flange. The lower bearing elements for taking up forces transmitted by the flange during clamping via the rod. Preferably, the movable lower bearing element is at the pivot axis of the flange, so that the forces are transmitted without generating torque on the rod.

Selon un perfectionnement, le dispositif de serrage comporte un conduit de détection débouchant sur l'élément d'appui fixe supérieur et destiné à être relié en communication fluidique avec un dispositif de détection à fuite de fluide. Lorsque la bride est en position de serrage, l'élément d'appui fixe supérieur est en contact avec l'élément d'appui mobile supérieur, ce qui obture le débouché du conduit de détection. On dispose ainsi d'un élément très compact pour détecter la fermeture ou l'ouverture de la bride. Le fluide utilisé est typiquement de l'air. On peut en outre prévoir une forme particulière sur l'élément d'appui mobile afin que la détection ne se fasse que dans une plage de position très précise.According to an improvement, the clamping device comprises a detection duct opening on the upper fixed support element and intended to be connected in fluid communication with a leakage detection device fluid. When the flange is in the clamping position, the upper fixed support member is in contact with the upper movable support element, which closes the outlet of the detection duct. There is thus a very compact element to detect the closing or opening of the flange. The fluid used is typically air. It is also possible to provide a particular shape on the movable support element so that the detection takes place only in a very precise position range.

L'invention a aussi pour objet un procédé de montage d'un dispositif de serrage tel que décrit précédemment, selon lequel on place la tige sur le corps pour la faire déboucher dans le corps, et on assemble le piston sur la partie débouchante de la tige.The invention also relates to a method of mounting a clamping device as described above, wherein the rod is placed on the body to make it open into the body, and the piston is assembled on the opening portion of the rod.

BRÈVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

L'invention sera mieux comprise et d'autres particularités et avantages apparaîtront à la lecture de la description qui va suivre, la description faisant référence aux dessins annexés parmi lesquels :

  • la figure 1 est une vue en perspective du dispositif de serrage selon un premier mode de réalisation de l'invention, en position de serrage ;
  • la figure 2 est une vue similaire à la figure 1, dans une position de relâchement ;
  • la figure 3 est une vue de dessus du dispositif de la figure 1 ;
  • la figure 4 est une vue de côté du dispositif de la figure 1, dans une position intermédiaire entre la position de serrage et la position de relâchement ;
  • la figure 5 est une vue du détail V de la figure 4, le dispositif étant dans la position de serrage ;
  • la figure 6 est une vue en coupe du dispositif selon un plan longitudinal en position de serrage ;
  • la figure 7 est une vue similaire à la figure 6, dans la position de relâchement ;
  • la figure 8 est une vue du détail VIII de la figure 4 ;
  • la figure 9 est une vue similaire à la figure 6 d'une bride selon une deuxième mode de réalisation de l'invention.
The invention will be better understood and other features and advantages will become apparent on reading the description which follows, the description making reference to the appended drawings, among which:
  • the figure 1 is a perspective view of the clamping device according to a first embodiment of the invention, in the clamping position;
  • the figure 2 is a view similar to the figure 1 in a relaxed position;
  • the figure 3 is a top view of the device of the figure 1 ;
  • the figure 4 is a side view of the device of the figure 1 in an intermediate position between the clamping position and the releasing position;
  • the figure 5 is a detail view V of the figure 4 the device being in the clamping position;
  • the figure 6 is a sectional view of the device along a longitudinal plane in the clamping position;
  • the figure 7 is a view similar to the figure 6 in the release position;
  • the figure 8 is a detail view VIII of the figure 4 ;
  • the figure 9 is a view similar to the figure 6 a flange according to a second embodiment of the invention.

DESCRIPTION DETAILLÉEDETAILED DESCRIPTION

Un dispositif de serrage conforme à un premier mode de réalisation de l'invention est destiné à serrer une pièce sur un outillage. Le dispositif comporte un corps 1 fixé sur l'outillage, par exemple par l'intermédiaire d'une collerette 10 vissée sur l'outillage. Le corps 1 comporte essentiellement une partie cylindrique 11 d'un côté de la collerette 10, et une partie en forme de chape 12 à l'opposé de la partie cylindrique 11. De manière arbitraire et afin de faciliter la description, on considère que le bas du dispositif est la partie cylindrique 11 et le haut est la chape 12. Cependant, le dispositif peut être monté sur l'outillage dans une orientation quelconque.A clamping device according to a first embodiment of the invention is intended to clamp a workpiece on a tool. The device comprises a body 1 fixed on the tool, for example by means of a collar 10 screwed onto the tooling. The body 1 essentially comprises a cylindrical portion 11 on one side of the flange 10, and a clevis-shaped portion 12 opposite the cylindrical portion 11. In an arbitrary manner and in order to facilitate the description, it is considered that the bottom of the device is the cylindrical portion 11 and the top is the clevis 12. However, the device can be mounted on the tool in any orientation.

Le dispositif de serrage comporte en outre une bride 2 montée mobile entre deux ailes 120 de la chape 12. La bride 2 comporte un bras 20 à l'extrémité duquel un point d'appui est destiné à venir serrer la pièce. La bride 2 a une position de serrage dans laquelle elle fait saillie au-delà d'une face avant 13 du corps 1 et dans laquelle elle est susceptible de serrer la pièce sur l'outillage, comme représenté sur les figures 1, 4 et 6. Elle a aussi une position de relâchement dans laquelle la face avant 13 est totalement dégagée vers le haut et le bras 20 est relevé, comme le montrent en particulier les figures 2 et 7. La bride 2 fait alors saillie vers le haut.The clamping device further comprises a flange 2 mounted between two flanges 120 of the yoke 12. The flange 2 comprises an arm 20 at the end of which a fulcrum is intended to clamp the workpiece. The flange 2 has a clamping position in which it protrudes beyond a front face 13 of the body 1 and in which it is capable of clamping the workpiece on the tool, as shown in FIGS. figures 1 , 4 and 6 . It also has a release position in which the front face 13 is completely unobstructed upwards and the arm 20 is raised, as shown in particular by figures 2 and 7 . The flange 2 then protrudes upwards.

Un vérin 3 est logé dans la partie cylindrique 11. Il comporte un alésage 31 pratiqué dans le corps 1 et dans lequel un coulisseau 32 est monté coulissant. Un bouchon 33 obture l'alésage 31 en étant vissé sur l'extérieur de la partie cylindrique 11 du corps 1. Le coulisseau 32 est divisé en deux parties assemblées entre elles : un piston 321 et une tige 322. Le piston 321 a la forme d'un disque duquel fait saillie une partie filetée 3210 placée au centre du disque. La tige 322 comporte un manchon fileté 3221, suivie d'une partie lisse 3222 puis d'un pied 3223 plus large que la partie lisse 3222. La partie lisse 3222 est ajustée de manière coulissante dans un col 14 du corps 1, succédant à l'alésage 31 tandis que le pied 3223 est situé au-delà du col 14, dans l'espace entre les ailes 120 de la chape 12. La partie filetée 3210 est vissée dans le manchon 3221 de la tige 322. Une première chambre 35 est délimitée dans l'alésage 31 entre le piston 321 et le couvercle 33 tandis qu'une deuxième chambre 36 est délimitée entre ledit piston 321 et le col 14. La partie cylindrique 11 comporte à l'extérieur deux gorges de distribution 113, 114, peu profondes. Chaque gorge de distribution 113, 114 est en communication avec l'une des chambres 35, 36 du vérin 3 par l'intermédiaire d'un conduit d'alimentation 1130, 1140 respectif. Des gorges d'étanchéité sont prévues de part et d'autre des gorges de distribution afin d'isoler ces dernières lorsque le corps 1 du dispositif est placé dans un logement cylindrique de l'outillage, non représenté. Deux canaux sont à prévoir débouchant dans le logement en regard des gorges de distribution afin d'alimenter le vérin 3 par un fluide sous pression tel que de l'huile ou de l'air à travers les gorges de distribution 113, 114 et les conduits d'alimentation 1130, 1140.A jack 3 is housed in the cylindrical portion 11. It comprises a bore 31 formed in the body 1 and wherein a slider 32 is slidably mounted. A plug 33 closes the bore 31 by being screwed on the outside of the cylindrical portion 11 of the body 1. The slide 32 is divided into two parts assembled together: a piston 321 and a rod 322. The piston 321 has the shape a disc which protrudes a threaded portion 3210 placed in the center of the disc. The rod 322 comprises a threaded sleeve 3221, followed by a smooth portion 3222 and a foot 3223 wider than the smooth portion 3222. The smooth portion 3222 is slidably fitted in a neck 14 of the body 1, succeeding the bore 31 while the foot 3223 is located beyond the neck 14, in the space between the wings 120 of the yoke 12. The threaded portion 3210 is screwed into the sleeve 3221 of the rod 322. A first chamber 35 is delimited in the bore 31 between the piston 321 and the cover 33 while a second chamber 36 is defined between said piston 321 and the neck 14. The cylindrical portion 11 has outside two distribution grooves 113, 114, little deep. Each distribution groove 113, 114 is in communication with one of the chambers 35, 36 of the cylinder 3 via a supply duct 1130, 1140 respectively. Sealing grooves are provided on both sides of the distribution grooves in order to isolate them when the body 1 of the device is placed in a cylindrical housing of the tool, not shown. Two channels are provided opening into the housing opposite the distribution grooves to supply the cylinder 3 with a fluid under pressure such as oil or air through the distribution grooves 113, 114 and ducts feed 1130, 1140.

La bride 2 est articulée autour d'un axe de pivotement A sur le pied 3223 du coulisseau 32. Du fait de la forme du pied 3223, il est possible de décaler l'axe de pivotement A par rapport à l'axe du coulisseau 32, de telle sorte que celui-ci se trouve par exemple décalé en direction de la face avant 13 d'une valeur proche du rayon de la partie lisse 3222 de la tige 322. La bride 2 atteint la position de relâchement par un pivotement autour de l'axe de pivotement A. Le mouvement de la bride 2 comporte en outre une phase de coulissement donnée par le coulissement du piston 321. La bride 2 comporte une chape de bride 21 comportant deux ailes 210 qui encadrent le pied 3223. L'axe de pivotement A est réalisé par un tourillon 22 traversant les ailes 120 de la chape de bride 21 et le pied 3223.The flange 2 is hinged about a pivot axis A on the foot 3223 of the slider 32. Due to the shape of the foot 3223, it is possible to shift the pivot axis A relative to the axis of the slider 32 , such that it is for example offset in the direction of the front face 13 by a value close to the radius of the smooth portion 3222 of the rod 322. The flange 2 reaches the release position by pivoting around the pivot axis A. The movement of the flange 2 further comprises a sliding phase given by the sliding of the piston 321. The flange 2 comprises a flange clevis 21 having two flanges 210 which surround the foot 3223. The axis pivoting A is formed by a pin 22 passing through the wings 120 of the flange clevis 21 and the foot 3223.

Le dispositif comporte des organes de guidage qui comprennent un organe de guidage fixe 15 par rapport au corps 1 et un organe de guidage mobile 16 lié à la bride 2 coopérant entre eux pour provoquer le pivotement de la bride 2 autour de l'axe de pivotement A à la fin de la course vers la position de relâchement. Les organes de guidage 15, 16 imposent également un mouvement de translation à la fin de la course vers la position de serrage.The device comprises guide members which comprise a fixed guide member 15 relative to the body 1 and a movable guide member 16 connected to the flange 2 cooperating with each other to cause the pivoting of the flange 2 around the pivot axis At the end of the race towards the release position. The guide members 15, 16 also require a translational movement at the end of the stroke towards the clamping position.

L'organe de guidage fixe 15 est formé par deux rainures 150 pratiquées respectivement dans les ailes 120 de la chape 12 de manière traversante. La rainure 150 s'étend selon un trajet dont une première portion 1501 est parallèle à la direction de translation de la bride 2 et une deuxième portion 1502 est orientée obliquement par rapport à la première portion 1501, pratiquement à 90°. La deuxième portion 1502 est orientée vers l'arrière, à l'opposé de la face avant 13. Les deux portions sont raccordées par une portion courbe. La rainure 150 est prolongée vers le bas pour créer un passage 1503 en regard de l'axe de pivotement A lorsque la bride 2 est en position de serrage. Ce passage permet l'introduction du tourillon 22 lors de l'assemblage du dispositif.The fixed guide member 15 is formed by two grooves 150 made respectively in the wings 120 of the clevis 12 in a through manner. The groove 150 extends along a path of which a first portion 1501 is parallel to the direction of translation of the flange 2 and a second portion 1502 is oriented obliquely with respect to the first portion 1501, substantially at 90 °. The second portion 1502 is oriented towards the rear, opposite the front face 13. The two portions are connected by a curved portion. The groove 150 is extended downward to create a passage 1503 facing the pivot axis A when the flange 2 is in the clamping position. This passage allows the introduction of the pin 22 during assembly of the device.

L'organe de guidage mobile est un doigt 16 sous la forme d'un téton. En pratique, le téton 16 est vissé sur la bride 2 et comporte une tête cylindrique d'un diamètre ajusté à la largeur de la rainure 150. Le téton 16 est placé au-dessus de l'axe de pivotement A.The movable guide member is a finger 16 in the form of a stud. In practice, the stud 16 is screwed onto the flange 2 and has a cylindrical head of a diameter adjusted to the width of the groove 150. The stud 16 is placed above the pivot axis A.

Le dispositif de serrage comporte en outre des éléments d'appui supérieurs 4 et des éléments d'appui inférieurs 5. Les éléments d'appui supérieurs 4 comprennent un élément d'appui fixe supérieur 41, fixe par rapport au corps 1, et un élément d'appui mobile supérieur 42 lié à la bride 2. L'élément d'appui fixe supérieur 41 est formé par deux surfaces d'appui sensiblement verticales côté avant des ailes 120 de la chape 12. L'élément d'appui mobile supérieur 42 comporte deux talons faisant saillie des faces de la bride 2 et offrant deux surfaces d'appui verticales quand la bride 2 est en position de serrage. Ainsi, les éléments d'appui fixe et mobile supérieurs 41, 42 coopèrent à la fin de la course de la bride 2 vers la position de serrage, pour s'offrir mutuellement un contact glissant parallèle au mouvement de translation de la bride 2 et s'opposer au pivotement de la bride 2 vers la position de relâchement.The clamping device furthermore comprises upper support elements 4 and lower support elements 5. The upper support elements 4 comprise an upper fixed support element 41, fixed with respect to the body 1, and an element upper movable support member 42 is connected to the flange 2. The upper fixed support element 41 is formed by two substantially vertical bearing surfaces on the front side of the wings 120 of the yoke 12. The upper movable support element 42 comprises two heels protruding from the faces of the flange 2 and providing two vertical bearing surfaces when the flange 2 is in the clamping position. Thus, the upper fixed and movable support elements 41, 42 cooperate at the end of the stroke of the flange 2 to the clamping position, to offer each other a sliding contact parallel to the translational movement of the flange 2 and s opposing the pivoting of the flange 2 towards the release position.

Les éléments d'appui inférieurs 5 comprennent un élément d'appui fixe inférieur 51, fixe par rapport au corps 1, et un élément d'appui mobile inférieur 52 lié à la tige 322. L'élément d'appui fixe inférieur 51 a la forme d'une nervure placée le long du pied 3223 de la tige 322 entre les ailes 120 de la chape de bride 21. L'élément d'appui mobile inférieur 52 comporte une surface d'appui portée par le pied 3223 en regard de la nervure 51. Les éléments inférieurs d'appui fixe et mobile 51, 52 coopèrent à la fin de la course de la bride 2 vers la position de serrage pour s'offrir mutuellement un contact glissant parallèle au mouvement de translation de la bride 2. En coopération avec les éléments d'appui supérieurs 4, la bride 2 est retenue de manière très rigide lorsqu'elle est placée en appui contre une pièce à serrer, avec des plans d'appui qui s'opposent au couple généré par le contact de la bride 2 sur la pièce en avant du dispositif.The lower support elements 5 comprise a lower fixed support element 51, fixed with respect to the 1, and a lower movable support member 52 connected to the rod 322. The lower fixed support member 51 has the shape of a rib placed along the foot 3223 of the rod 322 between the wings 120 of the The lower movable support element 52 has a bearing surface carried by the foot 3223 facing the rib 51. The lower fixed and movable support elements 51, 52 cooperate at the end of the run from the flange 2 to the clamping position to offer each other a sliding contact parallel to the translational movement of the flange 2. In cooperation with the upper support members 4, the flange 2 is retained very rigidly when it is placed in abutment against a workpiece to be clamped, with support planes that oppose the torque generated by the contact of the flange 2 on the workpiece in front of the device.

Un conduit de détection 19 est prévu débouchant sur l'élément d'appui fixe supérieur 41, comme le montre la figure 5, et destiné à être relié en communication fluidique avec un dispositif de détection à fuite de fluide. Pour cela, le conduit de détection 19 comporte une section de liaison débouchant dans une gorge de détection 115, entre la collerette 10 et la gorge d'étanchéité la plus proche de la collerette 10. L'élément d'appui mobile supérieur comporte une échancrure qui est en regard du débouché du conduit de détection 19 lorsque la bride est en fin de course vers la position de serrage. On pourra donc considérer que la bride n'a pas été arrêtée par la pièce à serrer, et donc que la pièce est absente dans cette position.A detection duct 19 is provided opening onto the upper fixed support element 41, as shown in FIG. figure 5 and intended to be connected in fluid communication with a fluid leak detection device. For this, the detection duct 19 comprises a connecting section opening into a detection groove 115, between the flange 10 and the sealing groove closest to the flange 10. The upper movable support member comprises a notch which is opposite the outlet of the detection duct 19 when the flange is at the end of travel towards the clamping position. It can therefore be considered that the flange was not stopped by the part to be clamped, and therefore that the part is absent in this position.

Fonctionnement du dispositifOperation of the device

On suppose que le dispositif est initialement dans la position de serrage, telle que représentée sur la figure 1. Le piston 321 est vers le bas de telle sorte que la première chambre 35 est de volume réduit. La bride 2 placée au plus bas, les éléments d'appui fixe et mobile étant en contact les uns avec les autres. La bride 2 est orientée en faisant saillie au-delà de la face avant 13.It is assumed that the device is initially in the clamping position, as shown in FIG. figure 1 . The piston 321 is downward so that the first chamber 35 is of reduced volume. The flange 2 placed at the lowest, the fixed and movable support elements being in contact with each other. The flange 2 is oriented projecting beyond the front face 13.

On actionne la bride 2 en envoyant un fluide sous pression dans la première chambre 35. Le fluide de la deuxième chambre 36 s'échappe et permet la montée du piston 321. La bride 2, entraînée par le pied 3223, remonte également avec un mouvement de translation, guidée en outre par le doigt 16 qui circule dans la première portion 1501 des rainures 150. Lorsque le doigt 16 arrive à la fin de la première portion 1501, les éléments d'appui supérieurs 4 sont dégagés l'un de l'autre. Le doigt s'engage alors dans la deuxième portion 1502 de la rainure 150, ce qui provoque le pivotement de la bride 2 autour de l'axe de pivotement A sur le pied 3223 du vérin 3 dans le sens de la flèche F1. L'élément d'appui supérieur mobile passe au-dessus de la chape 12. La bride 2 atteint alors la position de relâchement dans laquelle elle ne fait pas saillie au-delà de la face avant 13, mais dans laquelle le bras 20 est placé au-dessus de la chape 12 en étant pointé vers le haut. L'espace devant le dispositif est alors dégagé pour enlever et mettre en place une pièce.The flange 2 is actuated by sending a fluid under pressure into the first chamber 35. The fluid from the second chamber 36 escapes and allows the piston 321 to rise. The flange 2, driven by the foot 3223, also rises with a movement translation, further guided by the finger 16 which circulates in the first portion 1501 of the grooves 150. When the finger 16 reaches the end of the first portion 1501, the upper bearing elements 4 are disengaged one of the other. The finger then engages in the second portion 1502 of the groove 150, which causes the pivoting of the flange 2 around the pivot axis A on the foot 3223 of the cylinder 3 in the direction of the arrow F1. The movable upper support element passes over the yoke 12. The flange 2 then reaches the release position in which it does not protrude beyond the front face 13, but in which the arm 20 is placed above the clevis 12 pointing upwards. The space in front of the device is then cleared to remove and set up a room.

Pour effectuer le serrage de la pièce, on commande le vérin 3 en sens inverse, c'est-à-dire qu'on envoie le fluide sous pression dans la deuxième chambre 36 et en le laissant s'échapper de la première chambre 35. Le piston 321 commence alors un déplacement vers le bas. Le doigt 16 est alors forcé de parcourir la rainure 150 dans la deuxième portion 1502, ce qui provoque le pivotement de la bride 2 à l'inverse de la flèche F1, c'est-dire vers un abaissement du bras 20 au-dessus de la pièce au-delà de la face avant 13. Lorsque le doigt atteint la première portion 1501 de la rainure 150, le piston 321 poursuit sa course de coulissement en entraînant la bride 2 vers le bas. Les éléments d'appui supérieurs s'engagent en se faisant face. Lorsque le bras 20 entre en contact avec la pièce au niveau du point d'appui et exerce un effort de serrage sur elle, la bride 2 se met en appui contre la chape 12 au niveau des éléments d'appui supérieurs 4. Elle tend également à plaquer la tige 322 du vérin 3 contre la nervure au niveau des éléments d'appui inférieurs 5. La bride 2 est ainsi rigidement maintenue en appui sur la pièce.To clamp the workpiece, the actuator 3 is actuated in the opposite direction, that is to say that the pressurized fluid is sent into the second chamber 36 and allows it to escape from the first chamber 35. The piston 321 then begins a downward movement. The finger 16 is then forced to traverse the groove 150 in the second portion 1502, which causes the pivoting of the flange 2 to the opposite of the arrow F1, that is to say to a lowering of the arm 20 above the piece beyond the front face 13. When the finger reaches the first portion 1501 of the groove 150, the piston 321 continues its sliding stroke by driving the flange 2 downwards. The upper support elements engage in facing. When the arm 20 comes into contact with the part at the point of support and exerts a clamping force on it, the flange 2 bears against the yoke 12 at the level of the upper bearing elements 4. It also tends to to press the rod 322 of the cylinder 3 against the rib at the lower bearing elements 5. The flange 2 is thus rigidly held in abutment on the part.

Selon un deuxième mode de réalisation, montré sur la figure 9, un dispositif de bridage se distingue du dispositif selon le premier mode de réalisation en ce que le coulisseau 32' est réalisé d'un seul tenant comportant la tige 322' et le piston 321'.According to a second embodiment, shown on the figure 9 , a clamping device is distinguished from the device according to the first embodiment in that the slider 32 'is made in one piece comprising the rod 322' and the piston 321 '.

Pour le montage d'un tel dispositif, on introduit la tige 322' du coulisseau dans le col 14' en passant par la chambre du vérin. On met ensuite en place le tourillon 22 pour assembler la tige 322' avec la bride 2'. Le couvercle 33' est vissé sur le corps 1' pour fermer la chambre 35' du vérin. Le fonctionnement du dispositif est le même que pour le premier mode de réalisation.For the assembly of such a device, the rod 322 'of the slider is introduced into the neck 14', passing through the chamber of the jack. The journal 22 is then put in place to assemble the rod 322 'with the flange 2'. The lid 33 'is screwed onto the body 1' to close the chamber 35 'of the jack. The operation of the device is the same as for the first embodiment.

L'invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits.The invention is not limited to the embodiments that have just been described.

Claims (10)

  1. A clamping device of a workpiece on a tool, comprising a cylinder (3) and a flange (2), the cylinder (3) being selectively actuated by pressurised fluid and itself comprising a body (1) fixed to the tool when operating and a slide (32) mounted to slide relative to the body (1), the flange (2) being hinged about a pivot axis (A) on the slide (32), the body (1) comprising a front face (13) beyond which the flange (2) projects when it is in a gripping position to clamp the workpiece, the flange (2) also having a release position it reaches at least partially by pivoting about the pivot axis (A), the device comprising guide members (15, 16) which comprise a fixed guide member (15) relative to the body (1) and a mobile guide member (16) connected to the flange (2) cooperating together to drive the flange (2) in a rotation movement about the pivot axis (A) at least to completion of travel towards the release position and as per a translation movement at least to completion of travel towards the gripping position, the device being characterized in that the fixed guide member (15) comprises at least one hollowed groove (150) in the body (1) and the mobile guide member comprises at least one finger (16) engaged in the groove (150).
  2. The clamping device according to Claim 1, wherein the groove (150) extends according to a trajectory whereof a first portion (1501) is parallel to the direction of translation of the flange (2) and a second portion (1502) is oriented obliquely relative to the first portion (1501), the finger (16) located in the first portion (1501) when the flange (2) is in the gripping position or near and in the second portion (1502) when the flange (2) is driven to pivot.
  3. The clamping device according to Claim 2, wherein the finger (16) is located at a distance from the pivot axis (A), away in the direction of the translation of the rod (322) from the gripping position to the release position.
  4. The clamping device according to Claim 1, wherein the slide (32) comprises a piston (321) and a rod (322) joined by assembly and in that the pivot axis (A) is offset by a predetermined distance relative to the axis of the rod (322) in the direction of the front face (13).
  5. The clamping device according to Claim 4, wherein the piston (321) and the rod (322) are assembled by screwing into each other.
  6. The clamping device according to Claim 4, wherein the body (1) comprises a cap (33) for closing a cylinder chamber (3) delimited by the piston (321) and a bore (31) of the body (1) wherein the piston (321) slides.
  7. The clamping device according to Claim 1, characterized in that it comprises upper support elements (4), the upper support elements (4) comprising a fixed upper support element (41), fixed relative to the body (1), and a mobile upper support element (42) connected to the flange (2), the fixed and mobile upper support elements (41, 42) cooperating, at least to completion of travel of the flange (2) towards the gripping position, to mutually offer sliding contact parallel to the translation movement of the flange (2) and oppose pivoting of the flange (2) towards the release position.
  8. The clamping device according to Claim 1, characterized in that it comprises lower support elements (5) comprising a lower fixed support element (51), fixed relative to the body (1), and a lower mobile support element (52) connected to the rod (322), the fixed and mobile lower support elements (51, 52) cooperating, at least on completion of travel of the flange (2) towards the gripping position, to mutually offer sliding contact parallel to the translation movement of the flange (2).
  9. The clamping device according to Claim 1, characterized in that it comprises a detection conduit (19) terminating on the fixed support element (41) and intended to be connected in fluid communication with a device for detecting a fluid leak.
  10. A method for mounting a clamping device according to Claim 4, according to which the rod (322) is placed on the body (1) to have it terminate in the body (1), and the piston (321) is assembled on the terminating part of the rod (322).
EP13720455.8A 2012-04-12 2013-04-05 Device for clamping a workpiece on a tool Active EP2836336B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
RS20160899A RS55268B1 (en) 2012-04-12 2013-04-05 Device for clamping a workpiece on a tool
SI201330352A SI2836336T1 (en) 2012-04-12 2013-04-05 Device for clamping a workpiece on a tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1253377A FR2989297B1 (en) 2012-04-12 2012-04-12 DEVICE FOR CLAMPING A PIECE ON A TOOL
PCT/FR2013/050754 WO2013153319A1 (en) 2012-04-12 2013-04-05 Device for clamping a workpiece on a tool

Publications (2)

Publication Number Publication Date
EP2836336A1 EP2836336A1 (en) 2015-02-18
EP2836336B1 true EP2836336B1 (en) 2016-07-27

Family

ID=48289446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13720455.8A Active EP2836336B1 (en) 2012-04-12 2013-04-05 Device for clamping a workpiece on a tool

Country Status (11)

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US (1) US10682741B2 (en)
EP (1) EP2836336B1 (en)
JP (1) JP6367180B2 (en)
CN (1) CN104379306B (en)
DK (1) DK2836336T3 (en)
ES (1) ES2600732T3 (en)
FR (1) FR2989297B1 (en)
PT (1) PT2836336T (en)
RS (1) RS55268B1 (en)
SI (1) SI2836336T1 (en)
WO (1) WO2013153319A1 (en)

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US11679601B2 (en) * 2019-05-16 2023-06-20 Impossible Objects, Inc. Holdown process and system for platen
CN113385971A (en) * 2021-07-16 2021-09-14 格力(武安)精密装备制造有限公司 Novel cylinder block device of metal casting cast iron

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Also Published As

Publication number Publication date
US10682741B2 (en) 2020-06-16
US20150069689A1 (en) 2015-03-12
FR2989297B1 (en) 2015-03-13
JP2015512797A (en) 2015-04-30
JP6367180B2 (en) 2018-08-01
CN104379306B (en) 2016-11-09
WO2013153319A1 (en) 2013-10-17
RS55268B1 (en) 2017-02-28
FR2989297A1 (en) 2013-10-18
SI2836336T1 (en) 2016-12-30
ES2600732T3 (en) 2017-02-10
EP2836336A1 (en) 2015-02-18
PT2836336T (en) 2016-11-04
CN104379306A (en) 2015-02-25
DK2836336T3 (en) 2016-11-28

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