EP0387121B1 - Haltevorrichtung für ein längliches Werkstück, wie ein Stempel, eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch einer Abkantpresse - Google Patents

Haltevorrichtung für ein längliches Werkstück, wie ein Stempel, eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch einer Abkantpresse Download PDF

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Publication number
EP0387121B1
EP0387121B1 EP90400497A EP90400497A EP0387121B1 EP 0387121 B1 EP0387121 B1 EP 0387121B1 EP 90400497 A EP90400497 A EP 90400497A EP 90400497 A EP90400497 A EP 90400497A EP 0387121 B1 EP0387121 B1 EP 0387121B1
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EP
European Patent Office
Prior art keywords
tool
clamping plate
face
heel
clamping device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90400497A
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English (en)
French (fr)
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EP0387121A1 (de
Inventor
Jean Paul Henri Treillet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amada Europe SA
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Amada Europe SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Amada Europe SA filed Critical Amada Europe SA
Publication of EP0387121A1 publication Critical patent/EP0387121A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B21D5/0236—Tool clamping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor

Definitions

  • the present invention relates to an instantaneous fixing device, in accordance with safety standards, for various elongated parts and in particular for folding tools, to be fixed on the deck of a press brake.
  • the tool can be, for example, a punch or a press brake die hooked or fixed securely to the apron or to one or more intermediate tool holders. It must be adapted to the work carried out on the press brake, so it must be changed frequently.
  • the heel When suspended, avoid dropping the tool in the event of loosening; for this purpose, the heel can be provided with a groove or a shoulder, while the straps have a reverse form. In this case, it can only be mounted or removed laterally by sliding it, which has drawbacks, especially when the tool to be changed is surrounded on each side by other tools.
  • JP-A-62 267 019 is known, which is considered to be the closest state of the art, a fixing device of another type comprising a flange pivotally mounted about an axis carried by the support of the 'tool.
  • This flange is capable of clamping the heel for fixing the tool against one face of this support.
  • the flange is controlled by a movable blocking member placed against the upper part thereof.
  • this device is not satisfactory from the point of view of safety since it no longer retains the tool once the flange is in its tool release position.
  • the present invention aims to provide a tool fixing device which has all the safety guarantees, which allows frontal introduction in the hooking position and which provides instant clamping to its position. work, triggering by this gesture the automatic tightening of the flange.
  • the subject of the invention is a fixing device for an elongated part such as a punch or die or the like on a press brake apron or on intermediate tool holders of the type comprising a movable clamping flange disposed opposite one of the faces of the corresponding support and pivotally mounted about a longitudinal axis mounted in bearings carried by the support of the tool, this flange being able to clamp against this face of the support a heel for fixing the tool, a movable blocking member being able to be placed against a flat surface formed on the rear face of the flange facing the face of the tool support, characterized in that the flange has on its rear face facing the face of the tool support, a relief in the form of a shoulder, situated in the region of the pivot axis, and a bearing surface, beyond the relief, this bearing surface being intended to cooperate with the heel of the tool.
  • the present invention also relates to a tool intended to be adapted on a press brake of which at least one of the aprons is equipped with a device for fixing, this tool comprising a heel intended to be engaged between a clamping flange of this fixing device and a corresponding bearing face provided on the support of this tool, on its front face, intended to be turned towards the clamp, the tool fixing heel comprising a recess leaving an end nose, intended to be applied against a bearing surface provided on the corresponding face of the flange, characterized in that: - At the end of its opposite face, the tool fixing heel has a convex cylindrical surface or a chamfer inscribed in this surface.
  • a tool of the type in question can be fixed in place very quickly and with great security, thanks to a simple gesture which can be accomplished either by a man or by a robot. Indeed, the rotation of the tool-flange assembly automatically places the tool in the working position.
  • the removal of the tool it can be carried out in two stages as a safety measure, namely: a first stage corresponding to the loosening of the flange but with retention of the tool, and a second stage corresponding to the extraction of the tool on the front by a rotational movement opposite to that of the assembly.
  • the arrangement is such that the movable blocking member is maintained in its retracted position when the flange is open and it automatically goes into the locked position when the tool-flange assembly has pivoted completely in the direction of closing.
  • this blocking member consists of a rotary cam of such shape that by turning around its axis, its contact with the flange is practically linear and tends to spread the flange gradually.
  • this blocking member is actuated automatically when the tool is pushed, which ensures instant clamping of this tool.
  • the unlocking control is carried out by a lever.
  • the levers of the various fixing devices, provided on the same press brake apron can act independently of each other or be connected together and connected to a general control.
  • the invention also relates to a press brake equipped with a device as defined above.
  • Figure 1 shows, seen in profile, by way of example, the mounting of a folding punch on its tool holder by means of a fixing device according to the invention.
  • Figure 2 is a front view of such an assembly.
  • Figure 3 shows the device when the flange is loose, the punch being in the so-called safety position.
  • Figure 4 shows the extraction of the tool with the particularity of an arming lever located at the front.
  • FIG. 5 shows, seen from the rear, a system for actuating the cam in the position locked by a spring; the lever for arming the spring being integral with the cam constituting the locking member and this lever being located at the front, as in FIG. 4.
  • FIG. 6 shows, seen from the rear, a system for actuating such a cam in the unlocked position, the cocking lever of the spring rotating freely on the axis of the cam as in FIGS. 1 and 3.
  • Figure 7 illustrates a particular embodiment of the cam constituting the locking member.
  • the upper deck 1 receives a series of intermediate tool holders 2 fixed with flanges 3 tightened strongly by screws 4.
  • This traditional means of clamping is, in the '' state of the art, most often reproduced for fixing the punch 5 on the tool holder 2.
  • the heel of the tool is pinched between the front face 19 of the tool holder 2 and a similar flange to the flange 3.
  • the clamping of the tool fixing flange 6 is ensured in a different way. Instead of being tightened by screws, it is articulated around a longitudinal axis 7 parallel to the free edge of the tool holder. This axis is formed by two journals rotating in bearings 8a and 8b fixed on the tool holder 2.
  • this flange 6 On its rear face 10, which is turned opposite the tool holder 2, this flange 6 has a shoulder 9 which can be of polygonal or cylindrical shape and which is located in the region of the pivot axis 7. On either side of this shoulder 9, there are flat surfaces 11a and 11b which will be brought into contact respectively with a blocking member and with the front face of the tool 5. However, the surface 11a is separated from the shoulder 19 by the surface 22, the role of which will be explained later.
  • the locking member may consist of a rotary locking cam 12 and the arrangement is such that the flange 6 acts like a lever to ensure the tightening of the tool.
  • the upper edge 24 of the flange 6 is a cylindrical surface of radius R2 centered on the axis 7 or an equivalent polygonal surface. As will be explained later, this surface is intended to serve as a bearing surface for the cam 12 when the latter is in the retracted position.
  • the tool 5 has at its upper part a heel 15 whose face 5a located opposite the flange 6 has a relief 13 opposite and substantially the same profile as the shoulder 9 of the flange 6. At the upper end of the corresponding face of the heel 15, this recess 13 leaves a nose 21.
  • the opposite face 17 of the recess 18, located at the base of the heel 15, is extended at its upper end by a cylindrical surface 14 of radius R1 which is tangent thereto and the center of which is at the same distance from the face 17 and the shoulder 18 of the tool as the axis of rotation 7 of the faces 19 and 20 of the tool holder.
  • the reference faces of the tool and the tool holder coincide when the tool is clamped.
  • the nose 21 of the tool rests on the surface 22 of the flange, forming a bearing surface, when the tool is inserted into the tool holder.
  • the locking cam 12 is integral with a pin 25 itself connected to a clamping control member.
  • This cam 12 has such a shape that it can be brought, by rotation, into a retracted position above the flange 6, position in which a part 32a of its periphery rests against the bearing surface 24 provided on the flange, while in the clamping position its active face 30 exerts its force against the face 11a of this flange.
  • a particular embodiment of this cam as shown in FIG. 7, consists of a cone 30 limited by two planar faces 32a and 32b and by a cylindrical surface 31.
  • the axis of rotation 25 is parallel to the axis 34 of the cone and located at a certain distance from this axis.
  • Such a cam has the property of always having a rectilinear generator in a vertical plane whatever the angle of rotation, this generator gradually moving away from the base of the cone during rotation.
  • Figures 5 and 6 show, by way of nonlimiting example, an actuation mode of the locking cam 12.
  • the axis 25 of rotation of this cam passes through the tool holder 2 and is extended by an eccentric crank 35
  • On this crankcase is coupled a spring 36 housed around a guide 37 articulated on an axis 38.
  • the orientation of the crankcase 35 relative to the cam 12 is such that the torque on the cam varies in inverse function compression of the spring. In this way, the locking cam exerts its maximum force in the clamping position while it only very slightly presses on the face 24 of the flange when it is in the retracted position.
  • a lever 44 freely rotating about the axis 25 and bearing on a crank 39 secured to the crank 35 for arming spring.
  • This solution is particularly advantageous for operating the levers of several fixing devices using a general control connected to the axes 42.
  • the cams, and consequently the cranks 35 assume varying positions from one tool holder to another due to the various factors of dispersion of the parts making up the mechanical assembly.
  • the fixing device according to the invention can be used either to rigidly suspend an object, or to fix it on its base. In both cases, it allows installation and removal after a switch to the operator, which also has the advantage of avoiding interference or shock with other parts located in the same plane and close to the object handled.
  • the invention also relates to tools, intended to equip press brakes, and whose heel is specially arranged so that these tools can be fixed in place by means of devices fixing according to the invention.
  • the particular characteristics of the heel for fixing these tools are then those of the tool 5 previously described.
  • the present invention further relates to press brakes equipped with fastening devices as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Punching Or Piercing (AREA)

Claims (13)

  1. Haltevorrichtung für ein längliches Werkstück wie einen Stempel (5), eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch (1) einer Abkantpresse oder auf zwischenmontierten Werkzeughaltern (2), bestehend aus einer beweglichen Spannbrücke (6), die einer der Seiten (19) des entsprechenden Halters (2) gegenüber angeordnet ist und um eine Längsachse (7) kippbar angebracht ist, die in Lagern (8a, 8b) eingebaut ist, die von dem Werkzeughalter getragen werden, wobei diese Spannbrücke (6) geeignet ist, einen Befestigungsansatz (15) des Werkzeugs (5) gegen diese Seite (19) des Halters zu klemmen, wobei ein bewegliches Spannteil (12) geeignet ist, in Anlage an eine ebene Fläche (11a) gebracht zu werden, die an der Rückseite (10) der Spannbrücke (6) ausgeführt ist, die der Fläche (19) des Halters des Werkzeugs (5) zugekehrt ist,
       dadurch gekennzeichnet,
       daß die Spannbrücke (6) an ihrer der Fläche (19) des Halters des Werkzeugs (5) zugekehrten Rückseite (10) im Bereich der Kippachse (7) eine vorsprungartige Erhöhung (9) und jenseits der Erhöhung (9) eine Anlagefläche (22) aufweist, wobei diese Anlagefläche (22) dazu vorgesehen ist, mit dem Befestigungsansatz des Werkzeugs (5) zusammenzuwirken.
  2. Haltevorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das bewegliche Spannteil (12) an der entsprechenden Fläche (11a) der Spannbrücke (6) mit einer Fläche (30) in Anlage kommt, die ein Teil eines Spannockens ist, dessen Wirkung abhängig von der Stellung, in die der Nocken versetzt wird, zunimmt.
  3. Haltevorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das bewegliche Spannteil (12) aus einem Nocken besteht, der die Form eines Regelabschnitts (30) hat, und um eine Achse (25) drehbar montiert ist, die parallel zur Achse (34) dieses Regels (30) verläuft, sich aber von dieser in Abstand befindet.
  4. Haltevorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Verschieben des beweglichen Spannteils (12) in seine Spannposition durch eine Feder (36) gewährleistet ist, wobei die Verbindung dergestalt ist, daß diese sich entspannt, wenn dieses Spannteil (12) aus seiner eingeklappten Stellung befreit ist.
  5. Haltevorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Spannen der Feder (36), das sich auf das bewegliche Spannteil (12) auswirkt, mit dem Einklappen dieses Teils verbunden ist, wobei dieses spannen durch ein geeignetes Betätigungsmittel, zum Beispiel einen Hebel (44) gewährleistet wird.
  6. Haltevorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das bewegliche Spannteil (12) in seiner eingeklappten Stellung an einer an der Spannbrücke (6) vorgesehenen Anlagefläche (24) anliegt, die die Form einer konvexen, zylindrischen Krümmung mit dem Radius (R2) aufweist, deren Mittelpunkt auf der Drehachse (7) dieser Spannbrücke (6) liegt.
  7. Haltevorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß sie mit weiteren identischen Vorrichtungen verbunden ist, die zusammen mit ihr über die gesamte Länge der Abkantpresse verteilt sind, und daß die in den verschiedenen Vorrichtungen vorgesehenen Mittel zum spannen der Federn (36) mit einer allgemeinen steuerung verbunden sind.
  8. Haltevorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß das Spannteil (12) eine Stellung aufweist, bei der die Spannbrücke (6) gelöst ist, jedoch nur ganz leicht kippen kann, so daß sie das zuvor mittels dieser Spannbrücke (6) befestigte Werkzeug (5) hält.
  9. Werkzeug zum Einpassen in eine Abkantpresse, von deren Werktischen (1) mindestens einer mit einer Haltevorrichtung ausgerüstet ist, wobei dieses Werkzeug (5) einen Ansatz (15) aufweist, der zwischen einer Spannbrücke (6) dieser Haltevorrichtung und einer an dem Halter (2) dieses Werkzeugs vorgesehenen entsprechenden Anlagefläche (19) in Eingriff kommen soll, wobei der Befestigungsansatz (15) des Werkzeugs (5) an seiner Vorderseite (5a), die der Spannbrücke (6) zugewandt sein soll, eine Vertiefung (13) aufweist, wobei ein Endvorsprung (21) stehenbleibt, der dazu bestimmt ist, sich an eine Anlagefläche (22) anzulegen, die an der entsprechenden Seite der Spannbrücke (6) vorgesehen ist, dadurch gekennzeichnet, daß der Befestigungsansatz (15) des Werkzeugs (5) am Ende seiner anderen Seite (17) eine konvexe, zylindrische Fläche oder eine in dieser Fläche einbeschriebene Abschrägung (14) aufweist.
  10. Werkzeug nach Anspruch 9, dadurch gekennzeichnet, daß die konvexe Fläche (14) eine zylindrische Fläche ist, deren Mittelpunkt auf der Rippachse (7) dieser Spannbrücke (6) liegen soll, wenn die Vertiefung (13) dieses Werkzeugs (5) sich an die Erhöhung (9) der genannten Spannbrücke (6) anlegt.
  11. Werkzeug nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß es an der Basis des Ansatzes (15) auf der von der Vertiefung (13) abgewandten Seite einen Absatz (18) aufweist, der auf eine entsprechende Bezugsfläche (20) am Werkzeughalter (2) treffen soll, wenn das Werkzeug (5) eingespannt wird.
  12. Haltevorrichtung-Werkzeug-Anordnung mit einem länglichen Formteil wie einem Stempel (5), einer Matrize oder einem ähnlichen Werkzeug auf einem Werktisch (1) einer Abkantpresse oder auf zwischenmontierten Werkzeughaltern (2), bestehend aus einer beweglichen Spannbrücke (6), die einer der Seiten (19) des entsprechenden Halters (2) gegenüber angeordnet ist und um eine Längsachse (7) kippbar angebracht ist, die in Lagern (8a, 8b) eingebaut ist, die von dem Werkzeughalter getragen werden, wobei diese Spannbrücke (6) geeignet ist, einen Befestigungsansatz (15) des Werkzeugs (5) gegen diese Seite (19) des Halters zu klemmen, wobei dieser Ansatz an seiner Vorderseite (5a), die der Spannbrücke (6) zugewandt ist, eine Vertiefung (13) aufweist, wobei ein bewegliches Spannteil (12) geeignet ist, in Anlage an eine ebene Fläche (11a) gebracht zu werden, die an der Rückseite (10) der Spannbrücke (6) ausgeführt ist, die der Fläche (19) des Halters des Werkzeugs (5) zugekehrt ist, nachdem der Befestigungsansatz (15) des Werkzeugs (5) in seine Position gebracht wurde, wodurch das Festklemmen der Spannbrücke (6) an dem Ansatz (15) des Werkzeugs (5) gewährleistet wird, dadurch gekennzeichnet, daß
    - die Spannbrücke (6) an ihrer der Seite (19) des Halters des Werkzeugs (5) zugewandten Rückseite (10) im Bereich der Rippachse (7) eine vorsprungartige Erhöhung (9) aufweist,
    - die Vertiefung (13) des Befestigungsansatzes (15) des Werkzeugs (5) ein Profil aufweist, das der Erhöhung (9) an der Spannbrücke (6) der entsprechenden Befestigungsvorrichtung gleicht, und wobei ein Endvorsprung (21) stehenbleibt, der dazu bestimmt ist, sich an eine Anlagefläche (22) anzulegen, die an der entsprechenden Seite der Spannbrücke (6) jenseits der Erhöhung (9) vorgesehen ist,
    - der Befestigungsansatz (15) des Werkzeugs (5) am Ende seiner anderen Seite (17) eine konvexe, zylindrische Fläche oder eine in dieser Fläche einbeschriebene Abschrägung (14) aufweist.
  13. Abkantpresse, die zwei Werktische (1) übereinander aufweist, von denen einer beweglich und der andere fest ist, dadurch gekennzeichnet, daß mindestens einer dieser Werktische (1) mit einer Vorrichtung gemäß einem der Ansprüche 1 bis 8 zum Halten von einem oder mehreren Werkzeugen (5) von länglicher Form auf diesem Werktisch (1) ausgerüstet ist.
EP90400497A 1989-03-02 1990-02-22 Haltevorrichtung für ein längliches Werkstück, wie ein Stempel, eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch einer Abkantpresse Expired - Lifetime EP0387121B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8902694A FR2643838B1 (fr) 1989-03-02 1989-03-02 Dispositif de fixation rigide pour des pieces suspendues telles que poincons de presse-plieuse
FR8902694 1989-03-02

Publications (2)

Publication Number Publication Date
EP0387121A1 EP0387121A1 (de) 1990-09-12
EP0387121B1 true EP0387121B1 (de) 1993-09-22

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Application Number Title Priority Date Filing Date
EP90400497A Expired - Lifetime EP0387121B1 (de) 1989-03-02 1990-02-22 Haltevorrichtung für ein längliches Werkstück, wie ein Stempel, eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch einer Abkantpresse

Country Status (7)

Country Link
US (1) US4993255A (de)
EP (1) EP0387121B1 (de)
JP (1) JPH0722790B2 (de)
CA (1) CA2011218C (de)
DE (1) DE69003417T2 (de)
ES (1) ES2046720T3 (de)
FR (1) FR2643838B1 (de)

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FR2339485A1 (fr) * 1976-01-27 1977-08-26 Colly Pierre Moyen de fixation amovible pour porte-outil de presse-plieuse et similaire
AT364589B (de) * 1979-08-01 1981-10-27 Haemmerle Ag Spannvorrichtung zur befestigung eines werkzeuges an einem werkzeughalter
SU1175602A2 (ru) * 1984-03-23 1985-08-30 Межотраслевой Головной Конструкторско-Технологический Институт Технологической Оснастки Устройство дл креплени штампов на прессах
US4590788A (en) * 1984-10-04 1986-05-27 Wallis Bernard J Die clamp
US4598574A (en) * 1985-05-22 1986-07-08 Prince Corporation Die clamping device
DE3524694A1 (de) * 1985-07-11 1987-01-22 Hilma Gmbh Maschf Spannvorrichtung fuer oberwerkzeuge in abkantpressen
JPS6254524A (ja) * 1985-09-04 1987-03-10 Hitachi Ltd 金型自動クランプ装置
DE3609632A1 (de) * 1986-03-21 1987-09-24 Fritz Hakemann Abkantpresse zum gesenkbiegen von insbesondere blechen
JPH0716713B2 (ja) * 1986-05-14 1995-03-01 株式会社アマダ 曲げ加工機の金型クランプ装置
US4895014A (en) * 1986-08-28 1990-01-23 Houston David L Failsafe tool clamping system for press brake
US4787237A (en) * 1986-08-28 1988-11-29 Accurate Manufacturing Company Failsafe tool clamping system for press brake

Also Published As

Publication number Publication date
DE69003417D1 (de) 1993-10-28
FR2643838B1 (fr) 1991-05-31
ES2046720T3 (es) 1994-02-01
JPH02280927A (ja) 1990-11-16
US4993255A (en) 1991-02-19
CA2011218A1 (en) 1990-09-02
JPH0722790B2 (ja) 1995-03-15
FR2643838A1 (fr) 1990-09-07
EP0387121A1 (de) 1990-09-12
DE69003417T2 (de) 1994-03-10
CA2011218C (en) 2000-10-03

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