EP1071528B1 - Machine-outil a plusieurs etages travaillant le metal par formage, munie de blocs combines d'outils - Google Patents

Machine-outil a plusieurs etages travaillant le metal par formage, munie de blocs combines d'outils Download PDF

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Publication number
EP1071528B1
EP1071528B1 EP99907224A EP99907224A EP1071528B1 EP 1071528 B1 EP1071528 B1 EP 1071528B1 EP 99907224 A EP99907224 A EP 99907224A EP 99907224 A EP99907224 A EP 99907224A EP 1071528 B1 EP1071528 B1 EP 1071528B1
Authority
EP
European Patent Office
Prior art keywords
clamping
combined tool
forming machine
tool block
block
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
EP99907224A
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German (de)
English (en)
Other versions
EP1071528A1 (fr
Inventor
Hermann Zanzerl
Markus Moser
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.)
Hatebur Umformmaschinen AG
Original Assignee
Hatebur Umformmaschinen AG
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
Application filed by Hatebur Umformmaschinen AG filed Critical Hatebur Umformmaschinen AG
Publication of EP1071528A1 publication Critical patent/EP1071528A1/fr
Application granted granted Critical
Publication of EP1071528B1 publication Critical patent/EP1071528B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/022—Special design or construction multi-stage forging presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/03—Die mountings

Definitions

  • the present invention relates to a multi-stage Forming machine with tool combination blocks, as in the preamble of independent claim 1 is defined.
  • DE-A-197 22 228 describes a multi-stage forming machine known in which each tool in a tool cartridge is arranged by means of a clamping device in the Forming machine is held.
  • the clamped tool cartridges can be replaced relatively quickly if necessary be so that the downtime of the forming machine significantly can be reduced.
  • a tool change takes time but still comparatively long because of the fine adjustment the mutual distance between two opposite interacting tools on the forming machine.
  • EP-B-0 354 428 describes a generic multi-stage forming machine described one on a stationary machine body attached first tool combination block with, for example five matrix blocks and one on one in the direction of this first tool combination block reciprocable press slide attached second tool combination block with, for example comprises five stamp blocks.
  • the tool combination blocks are interchangeable as a whole and outside the forming machine adjustable. To ensure sufficient tension the tool combination blocks with the machine body or press slide screwed. This has the Disadvantage that a quick change of tool combination blocks is not possible because of the operating personnel must be handled from the outside with auxiliary tools.
  • a multi-stage forming machine has to be created of the type mentioned at the beginning, in which the downtime the forming machine when changing the tool comparable forming machines of the prior art can be significantly reduced.
  • a multi-stage Forming machine a first and second tool combination block comprises, at least one of which is at least one Has flaps with which he can directly or indirectly on a stationary machine body or on a Pressing slides attached clamping cams directly from above or indirectly on the machine body or on the press slide is attached.
  • the flap and the tensioning cam are like this trained that by the dead weight of the tool combination block and / or one in the vertical direction on the tool combination block acting tension an elastic tension the tool combination block and the machine body or
  • the first and second tool combination block have interacting tool blocks and are stationary Machine body or attached to the press slide, that in the direction of the first tool combination block is movable.
  • the replacement of an entire tool combination block allows fine adjustment the mutual distance between two opposite interacting tool blocks outside the Forming machine, while this is still with the old tool combination block can continue to be operated.
  • the downtime can remove the old tool combination block and the actual attachment of the new tool combination block be restricted.
  • both tool combination blocks are with at least provided with a flap and directly or indirectly on the machine body or press carriage, it is in principle but also conceivable that the one tool combination block is attached in a different way.
  • the mentioned at least one flap in the upper edge area of the tool combination block and in the lower edge area the tool combination block is at least one more Clamping flap arranged over another clamping cam from above directly or indirectly on the machine body or is attached to the press slide.
  • the mentioned at least one flap in the upper edge area of the tool combination block and in the lower edge area of the tool combination block is at least one down protruding clamping cams arranged, which in a direct or indirectly attached to the machine body or to the press slide, inserted upward open flap is.
  • the one or more flaps have and / or the one or more clamping cams to the vertical inclined contact surface for the assigned clamping cam or Flap on, which is preferably curved, so that when exerting a vertically downward force on the tool combination block or the flaps the assigned clamping cam (s) bent outwards will or will.
  • Due to the elastic bend of the or Tension flap (s) can have a high preload in horizontal Direction are generated for a safe, tense Attachment of the tool combination block ensures the emergence counteracts fretting rust and a mutual absolutely precise adaptation of the contact surfaces makes unnecessary.
  • the curvature of the contact surface prevents Edge pressure is created.
  • At least one of the upper edge area two tool combination blocks several clamping tabs and / or in lower edge area of this tool combination block several after clamping cams projecting below are spaced apart. This allows the tool combination block to be wide area can be supported and braced.
  • the tool combination block preferably has clamping tabs or at least one of the tool combination blocks with clamping tabs at least one stop on a stop surface outside the tool combination block on top.
  • the tool combination block becomes vertically precise when it is hooked in positions and defines the maximum tension force.
  • a multi-stage forming machine comprises a machine body 1, on which by means of screws 15 Lock plate 5 is attached.
  • Lock plate 5 In wedge recesses 53 (Fig. 5) Force wedges 16 arranged in the lock plate 5 (Fig. 4) serve in addition to the screws 15 for support the vertical bracing forces that occur.
  • the Machine body 1 and the lock plate 5 run through an ejector rod bore 28 and an ejector rod guide 29 (Fig. 4).
  • the Lock plate 5 two elongated clamping cams 52 on the one on both sides arranged above the lock plate 5 Centering housing 12 each up to its lateral Extend edge.
  • At the lower end of the lock plate 5 are distributed across its width are four flaps that protrude upwards 51 attached.
  • a tool combination block is suspended in the lock plate 5 3 with a support plate 32, a centering plate 36, usually five die blocks 35 and one themselves Block guide extending over the entire width 34.
  • Fig. 6 is a matrix block 35 drawn, by means of Screws 24 is attached to the centering plate 36.
  • the die is clamped using claws 351 and Claw screws 352.
  • the block guide 34, centering plate 36 and support plate 32 are by means of screws 18 and Centering plate 36 and support plate 32 additionally by means of Screws 17 connected together.
  • At the top of the support plate 32 are four evenly distributed across the width Tension flap 31 formed while at the lower end four clamping cams 322 are formed.
  • each two outer clamping tabs 31 are stops 33 by means of Screws 19 attached to the support plate 32 on the stop surfaces 521 on the clamping cams 52 of the lock plate 5 rest and so the tool combination block 3 vertically exactly position.
  • wedge recesses 323 in the support plate 32 arranged force absorption wedges 316 (FIG. 2 and 3) serve in addition to the screws 19 for support of the tension forces that occur.
  • the support plate 32 has in the further slot-shaped recesses 324, which the Allow insertion and removal of the tool combination block 3 while ejector rods in the area of the support plate 32 protrude.
  • a centering pin 11 with a ball head screwed (Fig. 4).
  • the ball head into the centering housing 12 introduced and through its special training (Fig. 5) directed to the desired horizontal position.
  • Hooking the tool combination block 3 into the lock plate 5 is generally done using an external, here unsigned crane device.
  • insertion aids 21, 22 on the machine body 1 and on the Lock plate 5 provided.
  • the clamping tabs 31 of the tool combination block 3 are the tensioning cams 52 of the Lock plate 5 hanged while the clamping cams 322 des Tool combination blocks 3 between the clamping tabs 51 and vertical contact surface of the lock plate 5 and the ball head of the centering pin 11 inserted into the centering housing 12 become.
  • the jigs 7 each comprise a clamping lever 71 which is one at the Lock plate 5 mounted lever axis 73 is rotatable.
  • the tensioning levers 71 are connected by means of hydraulic cylinders 74
  • Tappets 741 can be actuated and press when actuated by Screws 20 attached to the support plate 32 clamping bracket 72 down. 4 are the two extreme positions a tension lever 71 drawn.
  • Bending springs 75 ensure that the clamping lever 71 is constantly on the plungers 741 double-acting hydraulic cylinder 74.
  • the one about a release lever axis 92 rotatable release lever 91 includes the on a support 93 attached to the machine body 1 is.
  • the release lever 91 is by means of a hydraulic cylinder 94 can be actuated with plunger 941 and presses in when actuated attached to the centering plate 36 by means of screws 23 Lifting piece 95 upwards.
  • Fig. 1 are the two extreme positions of the release lever 91 drawn.
  • the attachment of a die-side tool combination block 4 on one in the direction of the die-side tool combination block 3 reciprocable press carriage 2 is carried out basically the same as the attachment of the die side Tool combination blocks 3 on the machine body 1.
  • a lock plate is attached to the press slide 2 by means of screws 115 6 attached.
  • the lock plate points at its upper end 6 elongated across its width Clamping cams 62 on, while four at their lower end projecting flaps 61 are attached.
  • the lock plate 6 furthermore has slot-shaped recesses 64 on the insertion and removal of the tool combination block 4 allow while the tool-side ejector rods protrude into the area of the lock plate 6.
  • the tool combination block is suspended in the lock plate 6 4 with a wedge-shaped support plate 42, five adjustment wedges 44, an adjustable wedge housing 47 and normally five adjustment plates 46 and five stamp blocks 45.
  • Fig. 10 there is only one by means of screws 124 on the associated one Adjustment plate 46 attached stamp block 45 drawn.
  • the stamps are clamped using claws 451 and claw screws 452.
  • the adjustment plates 46 are screwed into the adjusting wedge housing 47
  • Bolts 126 and nuts 127 attached to the adjusting wedge housing 47, the adjustment plates 46 before screwing the nuts 127 around the bolts 126 have play so that they can be aligned with the matrices.
  • the support plate 42 and the adjusting wedge housing 47 are by means of Screws 117 connected.
  • the clamping tabs 41 of the tool combination block 4 are on the clamping cams 62 of Lock plate 6 hanged while the clamping cams 422 des Tool combination blocks 4 between the clamping tabs 61 and vertical contact surface of the lock plate 6 introduced and the centering housing 14 over the ball head of the centering pin 13 are performed. It is because of its own weight of the tool combination block 4 reaches a position in which the stops 43 not yet on the stop surfaces 621 of the Clamping cams 62 rest, but the flaps 41 and 61 already minimally elastic due to the tensioning cams 62 or 422 have been bent outwards. The flaps 41 and 61 are biased in this way and practice a horizontal Clamping force from the tool combination block 4 and Lock plate 6 and thus indirectly press carriage 2 against each other tense.
  • the clamping devices 8 each include a tensioning lever 81 which is one at the Lock plate 6 mounted lever axis 83 is rotatable.
  • the tensioning levers 81 are connected by means of hydraulic cylinders 84 Plungers 841 can be actuated and press when actuated by Screws 120 attached to the support plate 42 clamping bracket 82 down. 8 are the two extreme positions a tension lever 81 drawn. Bending springs 85 ensure that the clamping lever 81 on the plungers 841 of the double-acting hydraulic cylinder 84.
  • Release device 10 To release the tool combination block 4, there is a one arranged below it Release device 10 is provided, one by one Release lever axis 102 includes rotatable release lever 101, which on the lock plate 6 is mounted.
  • the release lever 101 is can be actuated by means of a hydraulic cylinder 104 with tappet 106 and presses the tool combination block 4 when actuated via the centering housing arranged on the support plate 42 14 up.
  • Fig. 7 are the two extreme positions of the release lever 101 drawn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Making Paper Articles (AREA)
  • Forging (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Road Paving Structures (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Jigs For Machine Tools (AREA)

Claims (11)

  1. Machine de formage à plusieurs étages comportant un premier bloc à outils combinés (3) placé contre un corps de machine (1) à emplacement fixe et un second bloc à outils combinés (4) placé contre un chariot de compression (2) pouvant se déplacer dans un sens et dans l'autre en direction de ce premier bloc à outils combinés (3), le premier et le second bloc à outils combinés (3, 4) présentant des blocs individuels d'outil (35, 45) coopérant les uns avec les autres, caractérisée en ce qu'au moins l'un des deux blocs à outils combinés (3, 4) présente au moins une patte de serrage (31, 41), au moyen de laquelle il est accroché par l'intermédiaire d'une came de serrage (52, 62) placée directement ou indirectement respectivement sur le corps de machine (1) ou sur le chariot de compression (2), par le dessus respectivement au corps de machine (1) ou au chariot de compression (2), la patte de serrage (31, 41) et la came de serrage (52, 62) étant conformées de sorte qu'un calage élastique du bloc à outils combinés (3, 4) et respectivement du corps de machine (1) ou du chariot de compression (2) l'un contre l'autre se produit dans le sens horizontal par le poids propre du bloc à outils combinés (3, 4) et/ou par une force de serrage agissant dans le sens vertical sur le bloc à outils combinés (3, 4).
  2. Machine de formage selon la revendication 1, caractérisée en ce que ladite au moins une patte de serrage (31, 41) est disposée dans la zone de bord supérieure du bloc à outils combinés (3, 4) et en ce que
    a) soit au moins une autre patte de serrage est disposée dans la zone de bord inférieure du bloc à outils combinés (3, 4), cette patte étant accrochée par l'intermédiaire d'une autre came de serrage par le dessus directement ou indirectement respectivement au corps de machine (1) ou au chariot de compression (2), soit
    b) au moins une came de serrage (322, 422) s'étendant vers le bas est disposée dans la zone de bord inférieure du bloc à outils combinés (3, 4), ladite came étant insérée dans une patte ouverte vers le dessus (51, 61), placée directement ou indirectement respectivement sur le corps de machine (1) ou sur le chariot de compression (2).
  3. Machine de formage selon la revendication 1 ou 2, caractérisée en ce que la ou les patte(s) de serrage (31, 41, 51, 61) et/ou la ou les came(s) de serrage (52, 62, 322, 422) présente ou selon le cas présentent une surface d'application inclinée par rapport à la verticale respectivement pour la came de serrage (52, 62, 322, 422) ou la patte de serrage (31, 41, 51, 61) associée, ladite surface étant de préférence courbée de sorte que la ou les patte(s) de serrage (31, 41, 51, 61) fléchisse(nt) de façon élastique vers l'extérieur par la ou les cames de serrage (52, 62, 322, 422) associée(s) lors de l'application d'une force dirigée verticalement vers le bas sur le bloc à outils combinés (3, 4).
  4. Machine de formage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que sur le corps de machine (1) et/ou sur le chariot de compression (2) est fixée une ou selon le cas à chaque fois une plaque de verrouillage (5, 6), sur laquelle est ou selon le cas sont conformée(s) ou fixée(s) la ou les came(s) de serrage (52, 62) et le cas échéant la ou les patte(s) de serrage (51, 61) respectivement du côté machine ou du côté chariot de compression.
  5. Machine de formage selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'au moins l'un des blocs à outils combinés (3, 4) comporte une plaque d'appui (32, 42) sur laquelle la ou les patte(s) de serrage et le cas échéant la ou les came(s) de serrage (322, 422) du côté bloc à outils combinés est/sont configurée(s) ou fixée(s).
  6. Machine de formage selon l'une quelconque des revendications 1 à 5, caractérisée en ce que dans la zone de bord supérieure d'au moins un des deux blocs à outils combinés (3, 4) plusieurs pattes de serrage (31, 41) et/ou dans la zone de bord inférieure de ce bloc à outils combinés (3, 4) plusieurs cames de serrage (322, 422) s'étendant vers le bas sont disposées les unes à côtés des autres et à distance les unes des autres.
  7. Machine de formage selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'elle présente au moins un dispositif de serrage (7, 8), au moyen duquel une force de serrage agissant dans le sens vertical sur l'un des blocs à outils combinés (3, 4) peut être produite, le dispositif de serrage (7, 8) pouvant être disposé au-dessous du bloc à outils combinés (3, 4) et pouvant présenter un levier de serrage (71, 81) actionnable par voie hydraulique.
  8. Machine de formage selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'elle présente au moins un dispositif de détachement (9, 10) au moyen duquel une force de détachement agissant dans le sens vertical sur l'un des blocs à outils combinés (3, 4) peut être produite, le dispositif de détachement (9, 10) pouvant être disposé au-dessous du bloc à outils combinés (3, 4) et pouvant présenter un levier de détachement (91, 101) actionnable par voie hydraulique.
  9. Machine de formage selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le bloc à outils combinés (3, 4) avec patte de serrage (31, 41) ou selon le cas au moins l'un des blocs à outils combinés (3, 4) avec patte de serrage (31, 41) présente au moins une butée (33, 43) qui repose au-dessus sur une surface de butée (521, 621) se trouvant en dehors du bloc à outils combinés (3, 4), afin de positionner celui-ci verticalement avec précision.
  10. Machine de formage selon l'une quelconque des revendications 1 à 9, caractérisée en ce que le bloc à outils combinés (3, 4) avec patte de serrage (31, 41) ou selon le cas au moins l'un des blocs à outils combinés avec patte de serrage (31, 41) présente un élément de centrage, en particulier un tenon de centrage (11) ou un boítier de centrage (14), qui coopère, lors de l'insertion du bloc à outils combinés (3, 4) et pour le centrage horizontal de ce dernier, avec un contre-élément, en particulier un boítier de centrage (12) ou un tenon de centrage (13), situé en dehors du bloc à outils combinés (3, 4).
  11. Bloc à outils combinés (3, 4) destiné à une machine de formage à plusieurs étages selon l'une quelconque des revendications 1 à 10 avec un corps de machine (1) à emplacement fixe et un chariot de compression (2) se déplaçant dans un sens et dans l'autre, présentant au moins deux blocs individuels d'outil (35, 45), caractérisé en ce qu'il présente au moins une patte de serrage (31, 41) pouvant fléchir dans le domaine élastique au moyen de laquelle il peut être accroché par l'intermédiaire d'une came de serrage (52, 62) placée directement ou indirectement respectivement sur le corps de machine (1) ou sur le chariot de compression (2), par le dessus directement ou indirectement respectivement au corps de machine (1) ou au chariot de compression (2), la patte de serrage (31, 41) étant conformée de sorte à fléchir dans le domaine élastique vers l'extérieur sous l'effet de la came de serrage lors de l'accrochage et d'exercer ainsi une force de serrage horizontale.
EP99907224A 1998-04-17 1999-03-22 Machine-outil a plusieurs etages travaillant le metal par formage, munie de blocs combines d'outils Expired - Lifetime EP1071528B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH88498 1998-04-17
CH88498 1998-04-17
PCT/CH1999/000123 WO1999054071A1 (fr) 1998-04-17 1999-03-22 Machine-outil a plusieurs etages travaillant le metal par formage, munie de blocs combines d'outils

Publications (2)

Publication Number Publication Date
EP1071528A1 EP1071528A1 (fr) 2001-01-31
EP1071528B1 true EP1071528B1 (fr) 2003-05-21

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EP99907224A Expired - Lifetime EP1071528B1 (fr) 1998-04-17 1999-03-22 Machine-outil a plusieurs etages travaillant le metal par formage, munie de blocs combines d'outils

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Country Link
US (1) US6658913B1 (fr)
EP (1) EP1071528B1 (fr)
JP (1) JP3563035B2 (fr)
KR (1) KR100400703B1 (fr)
CN (1) CN1094078C (fr)
AU (1) AU2709699A (fr)
CZ (1) CZ295233B6 (fr)
DE (1) DE59905653D1 (fr)
EA (1) EA002249B1 (fr)
ES (1) ES2196774T3 (fr)
TW (1) TW420627B (fr)
WO (1) WO1999054071A1 (fr)

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DE10032089A1 (de) * 2000-03-30 2001-10-04 Schumag Ag Werkzeughalter sowie Anordnung aus Werkzeughalter und Werkzeug
US7418852B2 (en) * 2004-11-18 2008-09-02 Belvac Production Machinery, Inc. Quick change over apparatus for machine line
CN100446892C (zh) * 2005-04-13 2008-12-31 运通工业股份有限公司 部品成型机挟台传动杆的结合定位机构
US8024952B2 (en) * 2008-03-26 2011-09-27 National Machinery Llc Slide with segmented tooling held closed by stationary remote spring
US7784319B2 (en) * 2008-04-24 2010-08-31 Crown, Packaging Technology, Inc Systems and methods for monitoring and controlling a can necking process
US8601843B2 (en) 2008-04-24 2013-12-10 Crown Packaging Technology, Inc. High speed necking configuration
US7770425B2 (en) * 2008-04-24 2010-08-10 Crown, Packaging Technology, Inc. Container manufacturing process having front-end winder assembly
US7997111B2 (en) 2008-04-24 2011-08-16 Crown, Packaging Technology, Inc. Apparatus for rotating a container body
US8245551B2 (en) 2008-04-24 2012-08-21 Crown Packaging Technology, Inc. Adjustable transfer assembly for container manufacturing process
US8464567B2 (en) 2008-04-24 2013-06-18 Crown Packaging Technology, Inc. Distributed drives for a multi-stage can necking machine
DE102009005706A1 (de) 2009-01-22 2010-07-29 Winker Massivumformung Gmbh & Co. Kg Verfahren zum Herstellen von Rohlingen aus einem draht- oder stangenförmigen Halbzeug sowie Umformmaschine
DE102012010263A1 (de) * 2012-05-25 2013-11-28 Bleistahl-Produktions Gmbh & Co Kg Rundtaktpressmaschine
CN105059923B (zh) * 2015-07-20 2017-05-24 苏州宏瑞达新能源装备有限公司 一种同步驱动自动上玻璃机

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DE2135405B2 (de) * 1971-07-15 1974-08-08 Gebr. Hilgeland, 5600 Wuppertal Auswerferanordnung an einer Doppeldruckpresse, deren Stempelträger um eine am Pressenschlitten vorgesehene Achse schwenkbar und gegebenenfalls in den Endstellungen arretierbar ist
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US5829302A (en) 1996-05-31 1998-11-03 The National Machinery Company Cassette tooling

Also Published As

Publication number Publication date
KR20010041070A (ko) 2001-05-15
DE59905653D1 (de) 2003-06-26
ES2196774T3 (es) 2003-12-16
US6658913B1 (en) 2003-12-09
WO1999054071A1 (fr) 1999-10-28
CZ295233B6 (cs) 2005-06-15
EA002249B1 (ru) 2002-02-28
AU2709699A (en) 1999-11-08
TW420627B (en) 2001-02-01
KR100400703B1 (ko) 2003-10-08
EP1071528A1 (fr) 2001-01-31
CZ20003821A3 (cs) 2001-07-11
JP2002512127A (ja) 2002-04-23
JP3563035B2 (ja) 2004-09-08
CN1094078C (zh) 2002-11-13
EA200001079A1 (ru) 2001-04-23
CN1291121A (zh) 2001-04-11

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