EP0840663A1 - Procede et dispositif permettant de relier des extremites d'un fil de cerclage pour materiau d'emballage - Google Patents

Procede et dispositif permettant de relier des extremites d'un fil de cerclage pour materiau d'emballage

Info

Publication number
EP0840663A1
EP0840663A1 EP96927591A EP96927591A EP0840663A1 EP 0840663 A1 EP0840663 A1 EP 0840663A1 EP 96927591 A EP96927591 A EP 96927591A EP 96927591 A EP96927591 A EP 96927591A EP 0840663 A1 EP0840663 A1 EP 0840663A1
Authority
EP
European Patent Office
Prior art keywords
welding
current
pressure
wire ends
wire
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.)
Withdrawn
Application number
EP96927591A
Other languages
German (de)
English (en)
Inventor
Rudolf Kuhn
Dieter Teutrine
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.)
Certus Maschinenbau GmbH
Original Assignee
Certus Maschinenbau GmbH
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 Certus Maschinenbau GmbH filed Critical Certus Maschinenbau GmbH
Publication of EP0840663A1 publication Critical patent/EP0840663A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/04—Flash butt welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/02—Pressure butt welding

Definitions

  • the invention relates to a method and a Vorrichtur.g for connecting the wire ends of a strapping of packaged goods by resistance welding with the features in the preamble of the main method and device claim.
  • the wire ends are then butted together under pressure and welded together by applying a welding current.
  • the welding point is then actively and quickly cooled down by switching on a cooling air flow.
  • a tempering treatment follows the cooling process in order to remove undesired martensite hardness again.
  • the previously known method and the device operate in a time-controlled manner.
  • the pressure or feed movement of the wire ends takes place via a hydraulic cylinder, which during the
  • the invention solves this problem with the features in the main method and device claim.
  • the tolerances in the weld quality and strength can be more narrowly defined.
  • the welding process is easier to control and less dependent on fluctuating boundary conditions. The welding results are more reproducible.
  • the targeted control of the pressure or the contact pressure is particularly advantageous, possibly in conjunction with a current control.
  • the pressure control or the current control allow the uneven wire ends in front of the welder to be smoothed in a targeted manner and thus to create better current transitions and welding conditions. Smoothing is possible in different ways, e.g. by strong mechanical pressing or by melting
  • the contact pressure of the wire ends is kept essentially constant in the various pressure stages.
  • the wire ends can be melted undisturbed and more uniformly than in the prior art.
  • the initially high pressure is preferably reduced to a lower pressure level shortly before and / or during welding.
  • the high pressure will only come back in the upsetting phase.
  • the slow cooling can be promoted by a gradual reduction in the welding current and / or, if appropriate, by switching on a post-heating current.
  • the method according to the invention and the associated device can be used for any strapping of any packaging goods.
  • a preferred area of application is pressed bales made of fiber materials.
  • FIG. 1 a strapping device in a schematic side view
  • Figure 2 Flow diagram for flows and pressures during
  • FIGS. 3 and 4 Variants in the flow chart of FIG. 2.
  • FIG. 1 shows a strapping device (1) with which one or more straps are formed from a flexible tensioning wire (2) around a packaged product (3).
  • the packaged goods (3) can be of any shape. In the shown and preferred embodiment, it is a press bale (3) made of fibers, which is produced in a baler (not shown) and is held under high pressure during strapping between two press rams (21).
  • the strapped packaging goods may have a tendency to expand after relieving pressure.
  • the strapping should then prevent the packaged goods (3) from breaking apart.
  • a packaging film, a sack or another packaging material can also be wrapped around the bale (3) or another item to be packed before the strapping is attached. The subsequent strapping fixes this packaging material.
  • the strapping device (1) has a feed device (4) for the tensioning wire (2), which is drawn off from a wire supply (7) by means of suitable drives.
  • the tension wire (2) consists of a metal band a preferably circular or possibly also flat rectangular cross section.
  • a tensioning device (8) and a welding device (5) are arranged on one side of the wire guide (6).
  • the tensioning device (8) has a separating device (10) for cutting or pinching off the tensioning wire (2) in the required length and one
  • Infeed drive (9) with which the wire ends (11, 12) can be butted together.
  • the feed drive (9) preferably has a hydraulic cylinder or another suitable one
  • the contact pressure can preferably be switched in two or more pressure stages (19, 20) (see FIG. 2). Those in the higher pressure stage (20) on the wire ends
  • the (11,12) pressing force is, for example, approx. 1400 N at a cylinder pressure of approx. 100 bar.
  • the lower pressure stage (19) there is, for example, a contact pressure of approx. 140-280 N at a cylinder pressure of 10-20 bar.
  • the lower pressure level (19) has a size of approximately 10-20% of the higher pressure level (20).
  • the contact pressure at the wire ends (11, 12) can be kept or controlled essentially constant within the pressure stages (19, 20) by means of suitable sensors and drain valves (not shown).
  • the cylinder pressure can vary.
  • the feed drive (9) has a large-volume oil reservoir with a corresponding pressure generator for actuating the cylinder. As a result, the hydraulic oil flows at high speed even at low pressure and allows the piston to extend quickly at all pressure levels (19, 20).
  • the tensioning device (8) also has suitable tensioning means for holding the wire ends (11, 12).
  • a suitable pulling device is present in the tensioning device (8) or the feeding device (4), with which the wire loop or strapping is tensioned and after the welding of the. Wire ends (11.1?) Can be released from the wire guide (6).
  • the components of the wire feeder (4) and the tensioning device (8) can be designed in any suitable manner.
  • the structural design can be the same as that in DE-A 38 14 470.
  • the welding device (5) has two or more electrodes (not shown) which are connected to the wire ends (11, 12) in a suitable manner and are connected to a welding current source (13) via lines.
  • the welding current source (13) can emit three or more different current levels. For this purpose, it can be provided in a suitable manner with different taps on the welding transformer or can be controlled in another way. Apart from the three or more different current levels, the welding device (5) can otherwise be designed in a similar manner as in DE-A 38 174 470 his .
  • Transport means are optionally arranged on the wire guide (6) in order to move them relative to the packaged goods (3).
  • several straps can be placed at the same time, several wire guides (6) with associated tensioning and welding devices (8, 5) being provided.
  • Strapping device (1) a suitable computer-based and preferably programmable controller (14), which e.g. housed in the control cabinet of the feed device (4).
  • the controller (14) has one or more
  • connection or strapping process is preferably time-controlled in the manner described below.
  • Figure 2 gives a timing diagram for the switching of the different currents and pressures.
  • the clamping and welding device (8, 13) can have suitable sensors or other measuring devices (not shown) for monitoring, controlling and regulating the described processes, with which currents, pressures or forces, movements, speeds, positions etc. can be detected and measured become.
  • the wire guide (6) is moved into position with respect to the packaged goods (3) and a tensioning wire (2) is shot through the guide channels by the feed device (4).
  • the tension wire (2) is from above into the right wire guide shown in Figure 1
  • the free upper wire end (11) is in the clamping device (8) stopped and held with suitable jaws.
  • the wire loop is then tightened by moving the feed drive backwards.
  • the separating device (10) then cuts off the supplied wire, the lower wire end (12) being held in place with suitable clamping means and aligned with the upper wire end (11).
  • the two wire ends (11, 12) can then be brought closer together via the feed drive (9).
  • the wire ends (11, 12) can have uneven surfaces after the separation. These are smoothed before the actual welding. The welding and connection process takes place in the manner illustrated in FIGS. 2, 3 and 4.
  • Figures 2 and 3 show a variant with mechanical smoothing of the wire ends (11, 12).
  • the two wire ends (11, 12) in section "A" are pressed together with pressure and over a selectable period of time.
  • the high pressure stage (20) is switched at approx. 100 bar.
  • the pressing can take place according to FIG. 2 without current or according to FIG. 3 with a low contact current (22).
  • the pressure flow (22) can be lower than the preheating flow (15) and serves to facilitate the deformation of the wire ends
  • the smoothing in section "A” takes place by melting the wire ends (11, 12).
  • the wire ends (11, 12) are pressed together with the low pressure stage (19) or essentially without pressure.
  • a pre-melting stream (23) is switched on, which melts and flattens the protruding tips on the end faces.
  • the pre-melt current (23) can be in the order of the preheating current (15).
  • the lower pressure stage (19) is switched to approximately 10 bar or 10% of the higher pressure stage (20).
  • the welding current source (13) switches a preheating current (15) in section "B". For example, this is approximately 27% of the maximum
  • the welding current (16) is switched off again, which can also be ramped or abrupt.
  • the low pressure level (19) is present and continues for a certain period after the welding current (16) has been switched off. Due to the low pressure level (19) only one during the preheating and plasticizing phase of the wire ends (11, 12) lower and substantially constant contact pressure exerted so that the wire ends can melt evenly and at rest.
  • the infeed drive (9) can react quickly and precisely to the plasticization of the wire ends (11, 12) and the wire ends (11, 12) can be brought closer together and at the appropriate speed without welding spatter and under Gradual lateral displacement of the weld pool form the desired weld bead.
  • the microstructure formation in the melting range is influenced favorably.
  • the stepwise connection of the preheating and welding current (15, 16) also has an advantageous effect.
  • the introduced welding energy or amount of heat can be adjusted and regulated. This is possible by measuring the current or resistance and tracking the current in the process.
  • the weld is slowly cooled.
  • external cooling by a cooling air flow or the like is preferably dispensed with. The slow cooling takes place in the shown
  • a post-heating current (17) can be delayed in section "E" for, for example, about 0.4 see. be switched, the z. B. reaches a height of about 17% of the maximum current.
  • the post-heating current slows down the cooling and also ensures a slight post-heating of the welding point.
  • the high pressure stage (20) is preferably still present during the reheating phase.
  • the welding current (16) can be gradually reduced and e.g. be gradually or smoothly lowered via sections "D" and "E". This depends on the type of welding current source (13) and the welding current control. With this lowering, reheating may also take place by temporarily increasing the current.
  • connection process is complete and the strapping is wrapped around the packaged goods (3).
  • the strapping device (1) can then continue to the next strapping point or after the end of
  • the strapping device (1) can be suitably placed on packaging devices or similar other machines. In the preferred embodiment, it is located on a
  • Baler (not shown). This can be a carousel press or a central press in a baler with multiple pre-presses.
  • Modifications of the exemplary embodiment shown are possible in various ways with regard to the method and the device.
  • the specified sections, current levels and pressures may vary depending on the wire material and boundary conditions.
  • the current and pressure levels can also be graduated and changed even more finely.
  • the structural configurations of the components of the strapping device (1) can also be changed.
  • the type of wire guidance during the strapping can also be different than in the exemplary embodiment shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Wire Processing (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de relier les extrémités (11, 12) d'un fil de cerclage pour matériau d'emballage (3). Le fil de serrage (2) est passé autour du matériau d'emballage (3), tendu fortement et coupé, les extrémités (11, 12) du fil étant alors pressées l'une contre l'autre sous une haute pression et soudées par application d'un courant de soudage. Les extrémités (11, 12) du fil sont pressées l'une contre l'autre sous une pression pratiquement constante et régulable, au moins avant et/ou pendant l'opération de soudage. A cet effet, l'installation comporte un dispositif de tension (8) pourvu d'un entraînement d'avance (9) comprenant un système de régulation de pression présentant des étages de pression (19, 20) d'au moins, de préférence, deux niveaux différents.
EP96927591A 1995-07-27 1996-07-24 Procede et dispositif permettant de relier des extremites d'un fil de cerclage pour materiau d'emballage Withdrawn EP0840663A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19527417 1995-07-27
DE1995127417 DE19527417A1 (de) 1995-07-27 1995-07-27 Verfahren und Vorrichtung zum Verbinden von Drahtenden einer Umreifung von Verpackungsgut
PCT/EP1996/003257 WO1997004913A1 (fr) 1995-07-27 1996-07-24 Procede et dispositif permettant de relier des extremites d'un fil de cerclage pour materiau d'emballage

Publications (1)

Publication Number Publication Date
EP0840663A1 true EP0840663A1 (fr) 1998-05-13

Family

ID=7767904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96927591A Withdrawn EP0840663A1 (fr) 1995-07-27 1996-07-24 Procede et dispositif permettant de relier des extremites d'un fil de cerclage pour materiau d'emballage

Country Status (4)

Country Link
EP (1) EP0840663A1 (fr)
DE (1) DE19527417A1 (fr)
TW (1) TW375585B (fr)
WO (1) WO1997004913A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831665A1 (de) * 1998-07-15 2000-01-20 Cyklop Gmbh Verfahren und Vorrichtung zum Verschweißen von Bändern aus thermoplastischem Kunststoff
DE102011107309B4 (de) * 2011-07-06 2016-04-07 Thyssenkrupp Steel Europe Ag Verfahren und Vorrichtung zum Anschweißen von Funktionselementen an eine Schiene

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE404596C (de) * 1924-10-20 Thomas E Murray Elektrischer Widerstandsschweissapparat mit Vorrichtung zur Einstellung der Schweissdauer
DE735439C (de) * 1938-12-31 1943-05-19 Aeg Maschine zum Stumpfschweissen von Draehten und aehnlichen Werkstuecken
DE1205210B (de) * 1961-04-12 1965-11-18 Bratislavske Elektrotechnicke Hydraulische Schweisspresse zum elektrischen Widerstandsschweissen mit Steuereinrichtung des Druckprogrammverlaufes in einem Presszylinder
FR1431916A (fr) * 1965-02-03 1966-03-18 Citroen Sa Andre Dispositif de commande pneumatique à séquence
DE1615135A1 (de) * 1967-02-11 1970-05-14 British Ropes Ltd Verfahren und Vorrichtung zum elektrischen Widerstandsschweissen
DE2647338A1 (de) * 1976-10-18 1978-04-20 Siemens Ag Doppeldruckschweissverfahren fuer ein aus einer reihe von verseilten einzelleitern bestehendes elektrisches leiterseil
US4314131A (en) * 1977-12-15 1982-02-02 Fryer Corporation Method of band welding with weld testing
US4785154A (en) * 1987-05-20 1988-11-15 Cranston Machinery Co., Inc. Method and apparatus for joining together the ends of a metallic band by resistance inert gas welding
DE3805404A1 (de) * 1988-02-21 1989-08-31 Selzer Fertigungstech Verfahren zur stumpfschweissverbindung eines zapfens od. dgl. mit einer platte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9704913A1 *

Also Published As

Publication number Publication date
DE19527417A1 (de) 1997-02-06
WO1997004913A1 (fr) 1997-02-13
TW375585B (en) 1999-12-01

Similar Documents

Publication Publication Date Title
DE2840944A1 (de) Verfahren und maschine zum umschnueren eines gegenstandes
EP2116470B1 (fr) Procédé d'installation de bandes de cerclage plates autour de pièces d'emballage et dispositifs de cerclage destinés à l'exécution du procédé
DE2324293B2 (de) Vorrichtung zum Umschnüren eines Ballens o.dgl
EP0421019A1 (fr) Méthode et dispositif de jointure d'éléments en matière plastique par ultrasons
EP0776261B2 (fr) Dispositif d'assemblage par soudage d'au moins deux pieces et procede faisant appel audit dispositif
EP0178518A1 (fr) Procédé et dispositif pour le cerclage d'une balle ou similaire
DE102007022438B3 (de) Verfahren zum Umreifen eines Packguts mit einer Umreifungsmaschine
DE102010041203A1 (de) Anordnung, Verfahren und Steuerung zur Zufuhr eines Hilfsstoffs
DE3215798C2 (de) Verfahren und Vorrichtung zum Scheren von erwärmten Stangen aus Metall in Preßbarren
DE1241343B (de) Werkzeug zum Verschnueren von Kisten, Ballen od. dgl. mit einem Band
WO1997004913A1 (fr) Procede et dispositif permettant de relier des extremites d'un fil de cerclage pour materiau d'emballage
DE3438177A1 (de) Abbindeverfahren zum abbinden von wickelgut und abbindevorrichtung zu dessen durchfuehrung
DE4140603A1 (de) Loet- beziehungsweise schweissvorrichtung mit automatiischer zufuehrung von zusatzwerkstoff
EP3169591B1 (fr) Procédé et dispositif de fabrication des gerbes de cerclage
DE102022121422A1 (de) Verfahren zum Verändern der Umreifung sowie Ballenpresse zur Anwendung dieses Verfahrens
WO1995035237A1 (fr) Procede et dispositif permettant d'emballer des articles par portions
DE2331401A1 (de) Vorrichtung an banderoliermaschinen
DE2818325C2 (de) Bindemaschine
DE1088409B (de) Maschine zum Abfuellen und Verpacken fliessfaehiger Produkte
DE2552064B2 (de) Verschnürungsvorrichtung für Ballenpressen
EP1996365B1 (fr) Procede et dispositif de soudage d'elements en materiaux metalliques
DE10136991A1 (de) Verfahren zum Kurzzeit-Lichtbogenschweißen und Kurzzeit-Lichtbogenschweißsystem
DE202011109483U1 (de) Pneumatisch betätigtes Umreifungsgerät
DE2645243A1 (de) Verfahren und vorrichtung zum verbinden zweier baender aus thermoplastischem werkstoff
DE2222072A1 (de) Einrichtung und Verfahren zum Spannen von Kabeln

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19971218

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE IT

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19990205

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19990428