EP0875306B1 - Systeme d'alimentation en continu de presses - Google Patents

Systeme d'alimentation en continu de presses Download PDF

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Publication number
EP0875306B1
EP0875306B1 EP97933700A EP97933700A EP0875306B1 EP 0875306 B1 EP0875306 B1 EP 0875306B1 EP 97933700 A EP97933700 A EP 97933700A EP 97933700 A EP97933700 A EP 97933700A EP 0875306 B1 EP0875306 B1 EP 0875306B1
Authority
EP
European Patent Office
Prior art keywords
metal strip
strip
bobbin
press
storage 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
EP97933700A
Other languages
German (de)
English (en)
Other versions
EP0875306A1 (fr
Inventor
Eduardo Soler Font
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.)
EDT Ripoll a SF Foundation tambien conocida por Escola del Treball del Ripolles Fundacio SF
Original Assignee
EDT Ripoll a SF Foundation tambien conocida por Escola del Treball del Ripolles Fundacio SF
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Filing date
Publication date
Application filed by EDT Ripoll a SF Foundation tambien conocida por Escola del Treball del Ripolles Fundacio SF filed Critical EDT Ripoll a SF Foundation tambien conocida por Escola del Treball del Ripolles Fundacio SF
Publication of EP0875306A1 publication Critical patent/EP0875306A1/fr
Application granted granted Critical
Publication of EP0875306B1 publication Critical patent/EP0875306B1/fr
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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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C49/00—Devices for temporarily accumulating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/30—Arrangements for accumulating surplus web

Definitions

  • the present invention relates to a continuous supply system for presses, in particular, stamping presses, fed by a metal strip wound on a bobbin according to the preamble of claim 1 (see US 3 175 776 A), comprising: a welding device located downstream of the bobbin, by which a butt weld is made between the tail end of an exhausted bobbin and the leading end of a new bobbin; a variable capacity storage device in which the length of metal strip required for maintaining the supply during the bobbin changing and welding stages is accumulated; and a strip rectifier, delivering the strip to the press.
  • the invention has been specifically devised for ensuring the continuous supply of the presses which are currently used for the manufacture of magnetic plate bundles from which there are obtained, in a subsequent overinjection operation of aluminum, the so-called “squirrel cage” rotors for electric motors.
  • the said presses reach very high working speeds, while the metal strip bobbins from which they are fed cannot exceed relatively modest overall strip lengths. Therefore, in the present state of the art, it is necessary to interrupt the running of the said presses with exaggerated frequency to replace the exhausted bobbin with another. These operations notably increase the cost of the manufacturing process, seriously affecting the overall throughput of the machine, since each of them also requires the end of the new strip to be threaded through the rectifying and pulling devices and to set the press running again, which requires some time to recover its normal working rate.
  • variable strip accumulation store consists of obliging the strip to form a meander between a set of lower guide rolls and a set of upper guide rolls which may move vertically, varying the length of accumulated strip.
  • the radius of all these guide rolls may not be less than a limit, which depends on the gauge and the characteristics of the strip, but which is always considerable, such that the sum of the diameters of all these rolls, added to the need that all the items integrating the plant be aligned on the forward feed direction of the metal strip, means that the distance required between the bobbin and the press is unacceptable.
  • the metal strip is guided, both inside the accumulator store and, particularly, at the exit therefrom, by a rigid metal track, which may be provided with running and/or sliding members allowing the total space occupied by the store to be notably reduced and allowing the strip to be rotated in any way in the direction of feeding, for example in ninety degree turns, allowing the whole unit to be situated in the immediate proximity of the press being fed, such that the whole unit may comfortably remain under the control of a single operator.
  • a rigid metal track which may be provided with running and/or sliding members allowing the total space occupied by the store to be notably reduced and allowing the strip to be rotated in any way in the direction of feeding, for example in ninety degree turns, allowing the whole unit to be situated in the immediate proximity of the press being fed, such that the whole unit may comfortably remain under the control of a single operator.
  • the system of the invention comprises, in the first place, a standardized device for supplying the metal strip 1 from a bobbin 2.
  • This device is well known in the art and does not require any special explanation and has been designated overall with the reference 3 and is, preferably as may be schematically seen in Figure 2, of the type which is arranged to allow the assembly of two supply bobbins, one of them in use and the other stand-by.
  • This second bobbin may be placed in the supply position when the first one is exhausted by a simple lateral translation of the stand. This arrangement allows the time required for the bobbin change operations to be reduced to a minimum.
  • the system comprises a welding device 4 (also of known type which does not require any special explanation either), by which, in the first place, the trailing end of the exhausted metal strip 1 bobbin and the leading end of the new bobbin are accurately cut transversally, and secondly these ends are butt-welded together, such that both bobbins form a single strip 1, with no break in continuity.
  • a welding device 4 also of known type which does not require any special explanation either
  • the system Downstream of the welding device 4, the system comprises a specially designed variable length storage device 5 for the metal strip 1 to which reference will be made hereinafter.
  • the metal strip 1 passes to a guide device 6 which is an indispensable complement of the storage device 5 and to which further reference will also be made hereinafter.
  • the metal strip 1 is forced to pass through a known rectifier 7 which erases the resilient tendency of the strip 1 to curve, as a result of its stay in the bobbin 2 and of its passage through the storage 5 and guide 6 devices and delivers it directly to the press 8, causing it to form a loop 1' ( Figure 3), the purpose of which is simply to compensate small differences which may occasionally exist between the speed of supply of the strip 1 and the operating speed of the press.
  • the metal strip 1 is stored, forming the necessary reserve to be able to maintain the press 8 feed uninterrupted during the supply bobbin changeovers and the operation of the welding device 4, in spiral form and is guided from the center region of the spiral towards the press, with the necessary change(s) of direction being impressed thereon by the device 6.
  • the basic principle on which these changes of direction are based is shown schematically in Figure 4.
  • an essential feature of the present invention is that the changes of direction to which the strip is subjected be determined by a rigid strip-form guide 9 on which the metal strip bears, this guide being adapted helically to an ideal cylindrical surface 10, the radius of which is equal to or greater than the minimum radius of curvature admitted by said metal strip 1, without undergoing permanent deformation, on an axis perpendicular to its longitudinal axis.
  • This arrangement allows the metal strip 1 to be guided with absolute freedom, allowing as many changes of direction as may be interest to be impressed thereon, with no risk of permanent deformation.
  • the metal strip 1 reserve is formed by storing the strip spirally.
  • a device (indicated overall in Figures 1 to 3 with the reference 5) formed by two separate frames 5a and 5b ( Figures 5 and 6). These two frames 5a and 5b are positioned one above the other exactly facing each other, each comprising a series of guides 11 arranged essentially on the successive coils of an ideal spiral which extend continuously from one frame 5a to the other 5b, jointly defining the spiral.
  • the metal strip 1 is guided along the spiral, entering therein through the outer end 12 thereof and extending therefrom at the inner end 13, both ends being positioned in the lower frame 5a.
  • the curvature of the innermost coil of the unit may never have a radius smaller than the minimum radius of curvature that the strip 1 may support without undergoing permanent deformation.
  • the lower frame 5a is fixed, being rigidly attached to a base 15, whereas the upper frame 5b may be moved vertically on guides 16, 16', from a position (corresponding to the storage of a minimum length of metal strip 1) in which it is resting on the lower or fixed frame 5a to an opposite maximum position in which it is spaced apart a certain distance vertically above the fixed frame 5a and in which the portions of metal strip 1 occupying the successive half coils defined by the guides 11 are connected together with vertical straight portions 1" which significantly increase, up to the limit of interest in each case, the total length of strip 1 stored in the unit.
  • the difference between the length of metal strip stored in the device when this is in the maximum position ( Figure 6) and when it is in the minimum position ( Figure 5) should coincide with the length consumed by the press during the period of time that the external supply is interrupted, namely, while the said bobbin changeover, new threading and welding operations are being performed.
  • the metal strip 1 is guided by the guide device 6.
  • This guide device 6 is formed by a track 9, the working surface of which has a smooth straight section, which uninterruptedly extends the end of the guide 11 and, like the latter, it may be provided with a series of idler rollers 14, shoes or like members which reduce the friction between the working surface of the track 9 and the metal strip 1 sliding thereon as far as possible.
  • Figure 7 is a very schematic perspective view, with omission of the said sliding members and the supports to hold it in position, of one embodiment of the rigid guide track 9.
  • the track 9 may adopt any curvatures of interest, in one way or another, while adapting itself always helically to the surface of an ideal cylinder, without this causing tension in the metal strip which could cause permanent deformation.
  • a first curve 9a is absolutely necessary to remove the metal strip from the center region of the spiral formed by the independent frames 5a and 5b, i.e. to withdraw it from the vertical plane of the spiral and, as from this curve, the track must only direct the strip towards the rectifier 7 which finally delivers it to the press 8, it being possible for it to extend practically in a straight line.
  • the track have a second curve 9b, causing the metal strip to turn on the horizontal plane of approximately 90 degrees.
  • This arrangement allows the overall supply plant to be located very close to the press, so that a single operator may comfortably control the operation of both one and the other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Advancing Webs (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Belt Conveyors (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Claims (2)

  1. Système d'alimentation en continu pour des presses, en particulier des presses à estamper, alimentées par une bande métallique (1) enroulée sur une bobine (2), du type comportant : un dispositif de soudage (4) disposé en aval de la bobine (2), grâce auquel une soudure bout à bout est réalisée entre l'extrémité terminale d'une bobine vide et l'extrémité avant d'une nouvelle bobine; un dispositif de stockage à capacité variable (5) dans lequel la longueur de la bande métallique (1) exigée afin de maintenir l'alimentation pendant les étapes de changement de bobine et de soudage est accumulée; et un redresseur (7) de bande (1), qui délivre la bande à la presse (8), ledit dispositif de stockage à capacité variable (5) étant formé par des bâtis inférieur (5a) et supérieur (5b) mutuellement indépendant face à face situés l'un au-dessus de l'autre; chacun desdits bâtis (Sa, 5b) comportant une série de guides (11) disposés sur les spires successives d'une spirale idéale, qui sont correspondantes et complémentaires dans les deux bâtis (5a, 5b), en définissant conjointement une spirale, le long de laquelle ladite bande métallique (1) est prévue pour coulisser depuis son extrémité extérieure (12), située dans le bâti inférieur (5a) jusqu'à l'extrémité intérieure (13), située également dans le bâti inférieur (5a); ledit bâti inférieur (5a) étant fixe, alors que ledit bâti supérieur (5b) peut être déplacé verticalement, à l'écart de ou vers ledit bâti inférieur (5a) et en modifiant en conséquence la longueur totale de la bande métallique (1), caractérisé en ce que ladite bande métallique (1) est dirigée depuis ledit dispositif de stockage à capacité variable (5) vers ledit redresseur (7) par une piste rigide (9), dont la surface de travail, le long de laquelle coulisse ladite bande (1), est pourvue d'une section de ligne droite et décrit au moins une courbe gauche (9a), qui s'adapte de manière hélicoïdale d'elle-même à la surface d'un cylindre idéal ayant un rayon plus grand que le rayon minimum de courbure admissible par ladite bande métallique (1) sans subir une déformation permanente.
  2. Système selon la revendication 1, caractérisé en ce que ladite piste (9) destinée à guider ladite bande métallique (1) décrit au moins deux courbes gauches (9a, 9b) appliquant sur ladite bande métallique un tour d'approximativement quatre-vingt dix degrés sur l'emplacement horizontal dans son mouvement d'avance depuis le dispositif de stockage (5) jusqu'à la presse (8).
EP97933700A 1996-08-02 1997-07-31 Systeme d'alimentation en continu de presses Expired - Lifetime EP0875306B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES9601740A ES2123425B1 (es) 1996-08-02 1996-08-02 Sistema de alimentacion continua de prensas.
ES9601740 1996-08-02
PCT/ES1997/000199 WO1998005441A1 (fr) 1996-08-02 1997-07-31 Systeme d'alimentation en continu de presses

Publications (2)

Publication Number Publication Date
EP0875306A1 EP0875306A1 (fr) 1998-11-04
EP0875306B1 true EP0875306B1 (fr) 2000-10-11

Family

ID=8295744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97933700A Expired - Lifetime EP0875306B1 (fr) 1996-08-02 1997-07-31 Systeme d'alimentation en continu de presses

Country Status (5)

Country Link
EP (1) EP0875306B1 (fr)
CA (1) CA2233559A1 (fr)
DE (1) DE69703281T2 (fr)
ES (1) ES2123425B1 (fr)
WO (1) WO1998005441A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3175776A (en) * 1961-10-23 1965-03-30 British Iron Steel Research Apparatus for temporarily storing elongate material
US3589581A (en) * 1969-10-22 1971-06-29 Entwistle Co Accumulator
DE3335964A1 (de) * 1983-10-04 1985-04-25 Hoesch Ag, 4600 Dortmund Verfahren und vorrichtung zum ausgleichenden speichern von verpackungsband in verpackungsmaschinen
US5193757A (en) * 1985-05-06 1993-03-16 Lev Talanker Automatic rolled convolution accumulator

Also Published As

Publication number Publication date
CA2233559A1 (fr) 1998-02-12
EP0875306A1 (fr) 1998-11-04
DE69703281D1 (de) 2000-11-16
DE69703281T2 (de) 2001-05-17
ES2123425A1 (es) 1999-01-01
WO1998005441A1 (fr) 1998-02-12
ES2123425B1 (es) 1999-07-01

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