EP3311931B1 - Dispositif de verrouillage pour les outils d'une machine à usiner, en particulier pour une presse à plier - Google Patents

Dispositif de verrouillage pour les outils d'une machine à usiner, en particulier pour une presse à plier Download PDF

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Publication number
EP3311931B1
EP3311931B1 EP17197771.3A EP17197771A EP3311931B1 EP 3311931 B1 EP3311931 B1 EP 3311931B1 EP 17197771 A EP17197771 A EP 17197771A EP 3311931 B1 EP3311931 B1 EP 3311931B1
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EP
European Patent Office
Prior art keywords
locking
tool
lamina
locking device
bodies
Prior art date
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Active
Application number
EP17197771.3A
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German (de)
English (en)
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EP3311931A1 (fr
Inventor
Giuseppe Vittorio Gianelli
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.)
Teda SRL
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Teda SRL
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Publication date
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Publication of EP3311931A1 publication Critical patent/EP3311931A1/fr
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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
    • B21D5/0245—Fluid operated
    • 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

Definitions

  • the present invention refers to a locking device of tools in a machine tool, particularly of the folding press type, according to the preamble of claim 1 (see for example EP-B1-1 662 731 ).
  • folding presses are commonly used.
  • Folding presses generally comprise a lower base block that defines a fixed support plane of the sheet to be processed. Such a support plane is provided with a folding template, or matrix, according to the profile of which the sheet must be folded. Folding presses also comprise a slide, mobile along a direction perpendicular to the support plane of the sheet to be processed, with which a folding tool is associated, like for example a punch, which, cooperating with the folding template beneath the sheet, gives the desired folding to the sheet.
  • a folding tool like for example a punch
  • the movement of the slide is generated by an electromechanical or hydraulic control device that provides the force necessary to fold the sheet.
  • the folding tool has a first work end, profiled so as to cooperate with the folding template arranged on the fixed support plane, and a second end, for locking to the slide.
  • the folding press generally comprises locking means of the folding tool to the mobile slide, which can for example consist of a clamp that grips and locks in position the locking end of the tool with respect to the slide.
  • folding tools of a folding press are interchangeable since their size, in terms of height and length, as well as the geometry of the work end, can vary according to the folding profile to be made.
  • the folding tools can have variable lengths, generally greater than 20 millimetres and can be put near each other in the slide, to define a folding line having a desired overall length.
  • the composition of the folding press is made up of a plurality of fractioned tools of reduced length, which make the folding line of the desired length.
  • the aforementioned known folding presses are not without drawbacks, including the fact that the locking devices of the tools present on such presses do not ensure a continuity of positioning of the tools and a repeatability of the folds on the sheets being processed, in particular in the case in which the folding presses have variously fractioned tools, i.e. of different lengths, put near each other.
  • the main purpose of the present invention is to make a locking device of tools in a machine tool that ensures optimal, precise and homogeneously distributed locking of all of the tools associated with the machine tool, and in particular in the case in which such tools are of the fractioned type.
  • Another purpose of the present invention is to make a locking device that allows the tools to be locked firmly and precisely irrespective of the shape and size thereof.
  • Another purpose of the present invention is to make a locking device that ensures high locking forces of the tools.
  • Another purpose of the present invention is to make a locking device that is particularly simple and functional, with low costs.
  • the locking device of tools in a machine tool globally indicated with reference numeral 1, comprises:
  • At least one lamina 13 is interposed that is configured to transmit a locking thrust from the mobile piston 11 to the plurality of locking bodies 9 and to move such a plurality of locking bodies 9 along the action direction 90 from the disengaged position to the engagement position with the tool 7.
  • the locking device 1 advantageously comprises, between the base body 3 and the lamina 13, elastic abutment means 15.
  • Such elastic abutment means 15 are configured to push the lamina 13 along the action direction 90.
  • the lamina 13 is configured to transmit an unlocking thrust to the plurality of locking bodies 9 and to move such a plurality of locking bodies 9 along the action direction 90 from the engagement position to the disengaged position with the tool 7.
  • the elastic abutment means 15 can comprise a plurality of springs 150 housed in corresponding seats 31 formed in the base body 3.
  • figure 2 The engagement position of the locking bodies 9 with the tool 7 is illustrated in figure 2 , whereas figure 1 illustrates the disengaged position of the locking bodies 9 with the tool 7.
  • the locking bodies 9 are axially movable inside corresponding cylindrical seats 30 formed in the base body 3.
  • such cylindrical seats 30 housing the locking bodies 9 communicate with the seat 5 where the tool 7 is inserted.
  • a locking portion 92 of the locking body 9 can project inside the seat 5 to lock the tool 7 inside the seat itself.
  • the locking portion 92 of the locking body 9 can be defined by a projecting structure 93, preferably substantially V-shaped, capable of cooperating with the tool 7, as described hereinafter, to carry out the locking thereof inside the seat 5 of the locking device 1.
  • the tool 7 indeed comprises an operative end, not illustrated in the attached figures, which carries out the folding of the sheet, and a locking end 70 intended to be inserted and locked in the seat 5 of the locking device 1.
  • the tool 7 has at least one substantially V-shaped lateral seat 71, which is intended to receive the projecting structure 93 of the locking body 9 to carry out the locking thereof inside the seat 5.
  • the projecting structure 93 inserts into the corresponding V-shaped lateral seat 71 of the tool 7 and determines both the displacement of the tool 7 towards the bottom of the seat 5, i.e. in an upward vertical direction, and its locking in the transversal direction, i.e. in a horizontal direction towards the wall of the seat 5 opposite to the locking body 9.
  • the tool 7 there can be a pair of opposite V-shaped lateral seats 71.
  • the lamina 13 engages with a first portion 17 of each of the locking bodies 9 to transmit the locking thrust and with a second portion 19 of each of the locking bodies 9, distinct from such a first portion 17, to transmit the unlocking thrust.
  • the aforementioned first portion 17 of the locking body 9 is defined by a cylindrical or spherical surface.
  • the lamina 13 presses against the cylindrical (or spherical) portion 17 of the locking body 9, along a line (or a point) of contact and tangential thrust S, schematically highlighted in figures 2 and 5 , generating an axial thrust of the locking body 9 inside its own cylindrical seat 30, as better explained hereinafter.
  • the second portion 19 of the locking body 9 is defined by a radial recess 21 formed in the locking body 9 itself, in which radial recess 21 a portion 23 of the lamina 13 is inserted.
  • the mobile piston 11 of the locking device 1 is advantageously actuated pneumatically, for example through the use of air compressed to a work pressure substantially comprised between 5 and 10 bar and preferably comprised between 6 and 8 bar.
  • the locking bodies 9 are distributed along a work direction 25 substantially perpendicular to the action direction 90.
  • the lamina 13 advantageously has an elongated shape in such a work direction 25 so as to engage with the locking bodies 9.
  • the mobile piston 11 also has an elongated shape in the work direction 25 and rests on the lamina 13.
  • the mobile piston 11 advantageously has a substantially elliptical elongated shape, or a substantially rectangular elongated shape, preferably with rounded vertices or with the short sides in the shape of a semi-circle.
  • the mobile piston 11 advantageously has a so-called slot shape.
  • the elongated shape of the mobile piston 11 provides a large thrusting surface and therefore makes it possible to use relatively low work pressures and therefore to use compressed air systems.
  • the locking device 1 is advantageously configured to lock a plurality of variously fractioned tools 7.
  • the lamina 13 is made of a material of the steel type capable of flexing elastically to exert a substantially homogeneous locking thrust on all of the variously fractioned tools 7 present in the locking device 10.
  • the locking device 1 is therefore configured to lock tools 7 of various type and size.
  • the locking device 1 is suitable for locking both a monolithic tool 7 having a certain length, and a plurality of fractioned tools 7, each having a reduced length, where such fractioned tools 7 can be put together near each other to define a tool group having a certain length.
  • the locking device 1 can comprise a plurality of mobile pistons 11, adjacent to one another, so as to cover substantially the entire length of the base body 3, which has a length substantially equal to the length of the folding press.
  • Every mobile piston 11 is housed inside a cap 16, in which the chamber 12 is defined inside which the mobile piston 11 moves.
  • the tool 7 can comprise, at the locking end 70, at least one button 72 adapted for actuating a tooth 73, or a rigid metallic pin, which makes it possible to temporarily fasten the tool 7 in the seat 5 of the base body 3 before the stable locking through the locking bodies 9.
  • the tooth 73 of the tool 7 inserts in corresponding seats 33 formed in the base body 3 radially inside the housing seat 5 of the tool 7.
  • the lamina 13 can comprise a portion 130 configured to go into abutment against an abutment surface 35 of the base body 3.
  • a portion 130 is advantageously folded with respect to the lying plane of the lamina 13 so that, abutting against the abutment surface 35, a rotation point R of the lamina 13 with respect to the abutment surface 35 is defined, as better described hereinafter.
  • the locking body 9 comprises a cylindrical body 95 at an axial end of which the locking portion 92 defined by the projecting structure 93 is formed.
  • cylindrical body 95 At the opposite end of the cylindrical body 95 there is the cylindrical portion 17, intended to come into contact with the lamina 13 in the thrusting step of the locking body 9. At such an end of the cylindrical body 95 a further projecting body 96 is also formed, in which the recess 21 is defined for the engagement with the portion 23 of the lamina 13 in the pulling back step of the locking body 9.
  • the present invention also concerns a folding press equipped with a locking device of tools as described above.
  • Figure 1 illustrates the tool 7 inserted in the seat 5 of the base body 3, with its V-shaped lateral seat 71 substantially facing the cylindrical seat 30 formed in the base body 3, and thus substantially facing the locking portion 92 of the locking body 9 that is housed in such a cylindrical seat 30.
  • the pneumatic actuation of the mobile piston 11, by means of the compressed air injected into the chamber 12 determines an axial displacement, substantially along the direction 14, of the mobile piston 11, which thrusts the lamina 13.
  • the lamina 13 thus goes into abutment both against the abutment surface 35 at the rotation point R, and against the cylindrical (or spherical) portion 17 of the locking body 9, along the contact and thrusting line S (or contact and thrusting points in the case of a spherical shape of the portion 17 of the locking body 9).
  • the mobile piston 11, exerting its thrust against the lamina 13, can also go slightly off its axis, as can be seen in figure 2 , where the axis 110 of the piston 11 is slightly inclined with respect to the axial direction 14.
  • the slight rotation of the mobile piston 11 is foreseen and permitted since the use of low pressures of the air allows sliding couplings between the various components of the locking device 1 with a relative mutual clearance.
  • the lamina 13 thus hinges at the rotation point R and thrusts the locking body 9 at the contact and thrusting line S, ensuring that, irrespective of the possible inclination of the lamina 13 with respect to the axis of the locking body 9, coinciding with the action direction 90, the thrust that the lamina 13 exerts on the locking body 9 is always transmitted in such an action direction 90, avoiding jamming or mutual sliding between the components that are disadvantageous in terms of the mutual contact and friction forces that could be generated.
  • the movement of the locking body 9 along the action direction 90 ensures that the locking portion 92 projects in the seat 5 of the tool and, as already described, locks the tool 7 inside its seat 5.
  • the elastic abutment means 15 are capable of taking the lamina 13, and with it the mobile piston 11, into the starting position.
  • the lamina 13 in its backward movement, pulls the locking body 9 with it, since its portion 23, inserted in the recess 21 formed in the locking body 9, thrusts, at the area indicated with T in figure 1 , the locking body 9, allowing the tool 7 to be freed from the seat 5.
  • the locking device achieves the predetermined purposes since it makes it possible to ensure a firm and stable locking of the tools in the folding press, also in the case of different and variously fractioned tools.
  • the lamina present in the locking device indeed, thanks to its elastic deformation ability, makes it possible to exert a homogeneous thrust on all of the locking bodies, also in the case in which the various fractioned tools have different constructive tolerances from one another. In this way, the correct positioning in the folding press of tools of different shapes and lengths is always ensured.
  • Yet another advantage of the locking device consists of the fact that it can be actuated with compressed air pneumatic systems, instead of known hydraulic systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Claims (9)

  1. Dispositif de verrouillage (1) d'outils dans une machine à usiner, en particulier du type presse à plier, comprenant :
    - un corps de base (3) pourvu d'au moins un siège d'insertion (5) pour au moins un outil (7) ;
    - une pluralité de corps de verrouillage (9) mobiles le long d'une direction d'action (90) entre une position d'engagement avec ledit au moins un outil (7), pour verrouiller ledit au moins un outil (7) à l'intérieur dudit siège (5), et une position désengagée d'avec ledit au moins un outil (7), pour libérer ledit au moins un outil (7) dudit siège (5) ;
    - au moins un piston mobile (11) apte à être actionné pour déplacer ladite pluralité de corps de verrouillage (9) le long de ladite direction d'action (90) de ladite position désengagée à ladite position d'engagement avec ledit au moins un outil (7),
    caractérisé en ce qu'entre ledit au moins un piston mobile (11) et ladite pluralité de corps de verrouillage (9) au moins une lamelle (13) est interposée qui est configurée pour transmettre une poussée de verrouillage dudit au moins un piston mobile (11) à ladite pluralité de corps de verrouillage (9) et pour déplacer ladite pluralité de corps de verrouillage (9) le long de ladite direction d'action (90) de ladite position désengagée à ladite position d'engagement avec ledit au moins un outil (7) .
  2. Dispositif de verrouillage (1), selon la revendication 1, caractérisé en ce qu'il comprend, entre ledit corps de base (3) et ladite lamelle (13), des moyens de butée élastiques (15), lesdits moyens de butée élastiques (15) étant configurés pour pousser ladite lamelle (13) le long de ladite direction d'action (90), ladite lamelle (13) étant configurée pour transmettre une poussée de déverrouillage à ladite pluralité de corps de verrouillage (9) et pour déplacer ladite pluralité de corps de verrouillage (9) le long de ladite direction d'action (90) de ladite position d'engagement à ladite position désengagée d'avec ledit au moins un outil (7).
  3. Dispositif de verrouillage (1), selon la revendication 2, caractérisé en ce que ladite lamelle (13) s'engage avec une première partie (17) de chacun desdits corps de verrouillage (9) pour transmettre ladite poussée de verrouillage et avec une deuxième partie (19) de chacun desdits corps de verrouillage (9), distincte de ladite première partie (17), pour transmettre ladite poussée de déverrouillage.
  4. Dispositif de verrouillage (1), selon la revendication 3, caractérisé en ce que ladite première partie (17) dudit corps de verrouillage (9) est définie par une surface cylindrique ou sphérique.
  5. Dispositif de verrouillage (1), selon la revendication 3 ou la revendication 4, caractérisé en ce que ladite deuxième partie (19) dudit corps de verrouillage (9) est définie par un évidement (21) formé dans ledit corps de verrouillage (9), ledit évidement (21) ayant une partie (23) de ladite lamelle (13) insérée en lui.
  6. Dispositif de verrouillage (1), selon une ou plusieurs des revendications précédentes, caractérisé en ce que lesdits corps de verrouillage (9) sont répartis le long d'une direction de travail (25) substantiellement perpendiculaire à ladite direction d'action (90), ladite lamelle (13) ayant une forme allongée dans ladite direction de travail (25) de manière à s'engager avec lesdits corps de verrouillage (9), ledit piston mobile (11) ayant également une forme allongée dans ladite direction de travail (25) et reposant sur ladite lamelle (13).
  7. Dispositif de verrouillage (1), selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit piston mobile (11) est actionné de manière pneumatique.
  8. Dispositif de verrouillage (1), selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est configuré pour verrouiller une pluralité d'outils fractionnés de diverses manières (7), ladite lamelle (13) étant fabriquée en un matériau du type acier capable de fléchir de manière élastique pour exercer une poussée de verrouillage substantiellement homogène sur lesdits outils fractionnés de diverses manières (7).
  9. Presse à plier comprenant un dispositif de verrouillage (1) selon une ou plusieurs des revendications précédentes.
EP17197771.3A 2016-10-24 2017-10-23 Dispositif de verrouillage pour les outils d'une machine à usiner, en particulier pour une presse à plier Active EP3311931B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000106997A IT201600106997A1 (it) 2016-10-24 2016-10-24 Dispositivo di bloccaggio di utensili in una macchina utensile, particolarmente del tipo di una pressa piegatrice.

Publications (2)

Publication Number Publication Date
EP3311931A1 EP3311931A1 (fr) 2018-04-25
EP3311931B1 true EP3311931B1 (fr) 2019-05-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17197771.3A Active EP3311931B1 (fr) 2016-10-24 2017-10-23 Dispositif de verrouillage pour les outils d'une machine à usiner, en particulier pour une presse à plier

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Country Link
EP (1) EP3311931B1 (fr)
ES (1) ES2741641T3 (fr)
IT (1) IT201600106997A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11033944B2 (en) * 2018-09-30 2021-06-15 Wilson Tool International Inc. Tool holders usable with tooling having different tang styles, and seating/securing components of such holders
NL2026128B1 (en) * 2020-07-24 2022-03-28 Wila Bv Clamping system for a press brake having a first biasing means acting on an actuating member and press brake comprising such a clamping system
CN113751593A (zh) * 2021-09-24 2021-12-07 安徽东海机床制造有限公司 一种折弯机非平行折弯的上下组合模

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06182448A (ja) * 1992-12-17 1994-07-05 Amada Metrecs Co Ltd プレスブレーキ用上金型ホルダ
JP3228902B2 (ja) * 1998-03-04 2001-11-12 株式会社アマダ 上型ホルダ装置
AT414327B (de) * 2003-05-14 2007-09-15 Trumpf Maschinen Austria Gmbh Werkzeugaufnahmevorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
EP3311931A1 (fr) 2018-04-25
IT201600106997A1 (it) 2018-04-24
ES2741641T3 (es) 2020-02-11

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