DE2114462A1 - Welding thermoplastics - without sticking to the electrodes - Google Patents

Welding thermoplastics - without sticking to the electrodes

Info

Publication number
DE2114462A1
DE2114462A1 DE19712114462 DE2114462A DE2114462A1 DE 2114462 A1 DE2114462 A1 DE 2114462A1 DE 19712114462 DE19712114462 DE 19712114462 DE 2114462 A DE2114462 A DE 2114462A DE 2114462 A1 DE2114462 A1 DE 2114462A1
Authority
DE
Germany
Prior art keywords
electrode
head
source
tube
coolant
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.)
Pending
Application number
DE19712114462
Other languages
German (de)
Inventor
Albert 8000 München. M Strohmeier
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to DE19712114462 priority Critical patent/DE2114462A1/en
Publication of DE2114462A1 publication Critical patent/DE2114462A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/349—Cooling the welding zone on the welding spot
    • B29C66/3494—Cooling the welding zone on the welding spot while keeping the welding zone under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8124—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the structure of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81241—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the structure of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps being porous or sintered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Resistance Welding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A normal resistance-heated point welding appts. is used in which the movable upper electrode is fitted with a cooling system and the lower one bears the work. The appts. is connected to external control circuits so as to operate in cycles of (a) heating the upper electrode and pressing it on to the work (b) cooling the electrode and (c) lifting it away from the work.

Description

Konnwort: Warmstauchen Verfahren und Vorrichtung zu. Verschweiben odor Warmstauchen von thermoplastischen Kunststoffteilen.Connected word: hot upsetting process and apparatus too. Conceal odor hot upsetting of thermoplastic plastic parts.

Die Erfindung betrifft ein Verfahren zum Versohweißen oder Warmstauchen von thermoplastischen Kunststoffteilen, bei dem nach kurzzeitigem Erweichen des Bunststotfteiles mittels einer vom elektrischen Strom durch Widerstandserwärmung erhitzten Elektrode der Schweiß- oder Stauchdruck ausgeübt wird, sowie eine Vorrichtung zur Ausführung dieses Verfahrena.The invention relates to a method for welding or hot upsetting of thermoplastic plastic parts, in which after brief softening of the Bunststotfteiles by means of an electric current through resistance heating heated electrode the welding or upsetting pressure is exerted, as well as a device to carry out this procedure a.

Für das Verschweißen oder Verformen, insbesondere Warmetauchnn von Kunststoffteilen sind verschiedene Einrichtungen bekannt, so s.B. Hochfrequenz-Plastiksohweißmaschinen, die die Kunststoffteile elektrisch erwärmen, Ultraschall-Plastikschweißmaschinen, die über Reibungswärme die Erwärmung der Kunststoffteile herbeiführen. Diese Schweißmaschinen sind verhältnismäßig teuer. Es iat auch schon bekannt, Plaetikschweißmaschinen ftir das Verschweißen oder Verformen von Kunststoffteilen einzusetzen, bei denen z.B. zum Stauchen von Plastikteilen ein ständig beheizter Stauchstempel verwendet wirt. Nachteilig ist hierbei, daß beim Abheben nach dem Stauchvorgang der noch plastische Kunststoffkörper am ständig beheizten Stempel haften bleibt und Päden zieht oder eine narbige Oberfläche bildet.For welding or deforming, especially hot dipping of Plastic parts are known to various devices, so s.B. High frequency plastic welding machines, which heat the plastic parts electrically, ultrasonic plastic welding machines, which cause the plastic parts to heat up via frictional heat. These welding machines are relatively expensive. It is also already known to use plastic welding machines to use the welding or deformation of plastic parts, in which e.g. a constantly heated upsetting die is used to upsize plastic parts. The disadvantage here is that when lifting off after the upsetting process, the still plastic The plastic body sticks to the constantly heated stamp and pulls or picks forms a pitted surface.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Verschweißen oder Verformen von Kunstatoffteilen zu schaffen, bei dox die Schweiß stelle oder Verformung beix Abheben einer beheizten Elektrodo nicht beeinträchtigt wird und zudem die verwendete Vorrichtung verhältnismäßig einfach ist.The invention is based on the object of a method and a device for welding or deforming plastic parts, at dox sweat location or deformation when a heated electrodo is lifted off not is impaired and also the device used is relatively simple is.

Das Verfahren nach der Erfindung sieht vor, daß bei Verwendung eine r elektri nohen Widerstande-Punktschweißmaschine der erhitzte Kopf einer Elektrode vorzugsweise vor Autheben des Schweiß- oder Stauchdrucken durch ein durch den Elektrodenkopf hindurchgeleitetes Medium gekühlt wird. The method according to the invention provides that when using a r electric resistance spot welding machine the heated head of an electrode preferably before removing the welding or upsetting printing through a through the electrode head medium passed through is cooled.

Um eine rasche erhitzung und Kühlung der Elektrode im Wechsel zu erhalten, wird nach einer erderen Ausgestaltung der Erfindullg während der Erhitzungsphase der Elektrode ein gasförmiges Medium unter Druck durch dcn während der Kühlpause vom Kühlmedium durchflossenen Elektrodenkühlkanal geleitet Die Vorrichtung zur Durchführung des Verfahrens nach der Erfindung ist dadurch gekennzeichnet, daß eine elektrische Widerstands-Punktschweißmaschine verwendet ist, daß eine der Elektroden einen vom elektrischen Strom durchflossenen durch Wideitetandowärme erhitzten Elektrodenkopf besitzt und daß der Elektrodenkopf von eineia Kanal durchzogen ist, der zeitlich gesteuert, welchselweise an eine Kühlmittelquel le und eire Druckmittelquelle für gasföriiges Medium anschließbar ist. To allow rapid heating and cooling of the electrode alternately is obtained, according to one embodiment of the invention, during the heating phase the electrode a gaseous medium under pressure by dcn during the cooling pause The electrode cooling channel through which the cooling medium flows. The device for implementation of the method according to the invention is characterized in that an electrical Resistance spot welding machine is used that one of the electrodes is one of the Electric current flowing through the electrode head heated by wide tandem heat possesses and that the electrode head is traversed by a channel, the temporal controlled, alternately to a Kühlmittelquel le and eire pressure medium source for gaseous medium can be connected.

Vorzugsweise besteht die Elektrode aus einem Elektrodenaußenmantel aug elektrisch gut leitendem Material, der an den einen Pol einer Btromquelle angeschlossen ist und ßtirnneitig einen Mantelknopf aus einem hochtemperaturfesten und schlecht leitenden Material besitzt, konzentrisch zum Außen--mantel ist mit Abstand zu die um ein Elektrodenrohr aus elektisch gut leitendem Material vorhanden, dessen stirnseitiges Ende sich über einen Rohrteil aus hochtemperaturfestem und schlecht leitendem Material mit kleinim Querschnitt am Boden des Elektrodenkopfes abstützt und an den anderen Pol der Stromquelle angeschlossen ist und der Ringspalt zwischen Elektrodenaußenmantel und Elektrodenrohr ist wechselweise an eine Kühlmittelquelle bzw. eine Druckmittelquelle für gasförmiges Medium angeschlossen, wobei das Elektrodenrohr als Abfluß ausgebildet ist. The electrode preferably consists of an electrode outer jacket made of electrically good conductive material, which is connected to one pole of a power source is and at the front a coat button made of a high temperature resistant and bad conductive material, concentric to the outer jacket is at a distance from the around an electrode tube made of electrically good conductive material, its frontal Ends with a pipe part made of high temperature resistant and poorly conductive material with a small cross-section on the bottom of the electrode head and on the other Pole of the power source is connected and the annular gap between the electrode outer jacket and electrode tube is alternate to a coolant source or a pressure medium source for gaseous medium connected, the electrode tube is designed as a drain.

Flach einer Ausgestaltung der Erfindung ist das Kopf innere des Elektrodenaußenmantels sacklochförmig mit kegeligem Ende ausgebildet und dasRohrteil des Elektrodenrohres stützt sich mit abgeschrägter Mantelfläche gegen die kegelförmige Lochfläche ab.One embodiment of the invention is the inside of the head of the electrode outer jacket Blind hole-shaped with a conical end and the tubular part of the electrode tube rests against the conical hole surface with a beveled outer surface.

Nach einer anderen Ausgestaltung der Erfindung ist nur die dem Oberarm zugeordnete Elektrode einer Punktschweißmaschine an eine elektrische Stromquelle angeschlossen, wogegen die den Unterarm zugeordnete Ele:trode als reines AbstUtzelement ausgebildet ist.According to another embodiment of the invention, only that of the upper arm associated electrode of a spot welding machine to an electrical power source connected, whereas the electrode assigned to the forearm serves as a pure support element is trained.

Schließlich sind nach einer weiteren Ausgestaltung der Erfindung der elektrische Strom für Elektrode, das Kühlmittel, das gasförmige druckmittel und die Hubbewegung der Elektrode durch Zeitssteuergeräte selosttätig aufeinanderfolgend gesteuert.Finally, according to a further embodiment of the invention, the Electric current for the electrode, the coolant, the gaseous pressure medium and the stroke movement of the electrode is automatically sequential by time control devices controlled.

Eine beispielsweise Ausführungsform der Erfindung ist in der Zeichnung dargestellt. In di zeigen: Fig. 1 eine Teil-Seitenansicht einer Schweißvorrichtung nach der Erfindung, teilweise im Schnitt, Fig. 2 eine Teilstirnansicht von Fig. 1 und Fig.3 einen Teilschnitt des Kopfes der Elektrode für die Schweißvorrichtung nach der Erfindung.An exemplary embodiment of the invention is shown in the drawing shown. 1 shows a partial side view of a welding device according to the invention, partially in section, FIG. 2 is a partial front view of FIG. 1 and 3 show a partial section of the head of the electrode for the welding device according to the invention.

Zum Verschweißen oder verformen, vwie z.B. Stauchen, von Kunststoffteilen soll nach der Erfindung eine übliche Punktschweißmaschine vewndet werden, die entsprechend umgestalltet ist. Eine solche Punktschweißmaschine ist teilweise in Fig. 1 dargestellt. Der Ständer 1 besitzt wie üblich einen Oberarm 2, der in Pfeilrichtung I heb- und senkbar ist und einen ortsfesten Unterarm 3. Der Unterarm 3 trägt anstatt einer üblichen Elektrode ein Abstützelement 4 für ein schematisch angedeutetes Werkstück 5.For welding or deforming, e.g. for upsetting, plastic parts is to be vewndet according to the invention, a conventional spot welding machine, which accordingly is redesigned. Such a spot welding machine is partially shown in FIG. The stand 1 has, as usual, an upper arm 2, which is raised in the direction of arrow I and lowerable is and a stationary forearm 3. The forearm 3 carries instead of a conventional one Electrode, a support element 4 for a schematically indicated workpiece 5.

Der Oberarri 2 trägt festgeklemmt eine Elektrode 6, die nach der Erfindung in besonderer Weise ausgebildet ist.The upper arm 2 carries clamped an electrode 6 according to the invention is designed in a special way.

Diese Elektrode 6 besteht aus einem Außenmantel 7 aus elektrisch gut leitendem Material. An dem dem Werstück zugekehrten Ende ist am Außenmantel 7 ein Kopf 8 aus einem hochtemperaturfesten und elektrisch schlecht leitendem Sinter-Elektroden-Werkstoff, z.B. Wolfram, befestigt, beispielsweise durch Verlöten. Der Kopf 8 besitzt in seiner Längsrichtung ein Sackloch 9 mit nahe der Arbeitsfläche 10 endendem kegeligem Ende 11.This electrode 6 consists of an outer jacket 7 made of electrically good conductive material. At the end facing the workpiece there is a 7 on the outer jacket Head 8 made of a high temperature resistant and electrically poorly conductive sintered electrode material, e.g. tungsten, attached, e.g. by soldering. The head 8 has in his In the longitudinal direction, a blind hole 9 with a conical end ending near the work surface 10 11.

Die Arbeitsfläche 10 ist, wird diese Elektrode zum Stauchen vewendet, entsprechend geformt. Im vorliegenden Fall ist sie zur Bildung eines Stauchkopfes entsprechend gekrümmt ausgebildet.If the working surface is 10, this electrode is used for upsetting, shaped accordingly. In the present case it is used to form an upsetting head accordingly curved.

Konzentrisch zu dem Außenmantel 7 ist ein Elektrodenrohr 12 aus elektrisch gut leitendem Material mit einem Ringspalt 13 zum Außenmantel angeordnet. An seinem sinen Ende 14 ist ein Rohrteil 15 befetigt, dessen freies Ende kegelig abstumpft ist und sich auf dem Ende 11 des Sackloches 9 abstützt. Das Rohrteil 5 besteht aus einem hochtemperaturfesten zur schledt leitenden Siter-Elektroden-Werkstoff, z.B.Wolfram. Die Berührungszone zwischen Rohrteil 15 und Kopf 8 ist im Querschnitt so bemessen, daß die Strinfläche des Kopfes 8 bei Stromdurchgang stark erwärmt wird.An electrode tube 12 made of electrical is concentric with the outer jacket 7 Good conductive material arranged with an annular gap 13 to the outer jacket. On his At its end 14, a tubular part 15 is attached, the free end of which is truncated conically is and is supported on the end 11 of the blind hole 9. The pipe part 5 consists of a high-temperature-resistant to schledt conductive siter electrode material, e.g. tungsten. The contact zone between pipe part 15 and head 8 is dimensioned in cross section so that that the face of the head 8 is strongly heated when current passes through.

Auf das obere Ende 16 des Außenmantels 7 ist ein Anpreßdeckel 17 aufgeschraubt, der über einen Dichtungsteil 18 und Ringteil 19 das Elektrodenrohr 12 über einen Wulst 20 an den K?rf 8 anpreßt. Das obere Ende 16 des Außenmantels 7 ist mit einen Anschlußstutzen 21 versehen, über den Anschluß. stutzen 21 ist eine Leitung 22 angeschlossen, die zu einem Magnetventil 23 führt. Das Magnetventil 23 schließt wechselweise eine nicht dargestellte Kühlmittelquelle bzw. eine Preßluftquelle an die Leitung 2 bzw. 22' an.A pressure cover 17 is screwed onto the upper end 16 of the outer jacket 7, the via a sealing part 18 and ring part 19 the electrode tube 12 via a Bead 20 presses against body 8. The upper end 16 of the outer jacket 7 is with a Connection piece 21 provided over the connection. trim 21 is a Line 22 is connected, which leads to a solenoid valve 23. The solenoid valve 23 alternately closes a source of coolant (not shown) or a source of compressed air to line 2 or 22 '.

Das Elektrodenrohr 12 ist an seinen äußeren Ende 24 mit einem Anschluß 25 für eine nicht dargestellte Abflußleitung versehen.The electrode tube 12 is at its outer end 24 with a connection 25 provided for a drain line, not shown.

Das Elekt-.odenrohr 12 ist über eine Klemme e 26, eine Leitung 27 an die Sekundärwicklung 28 eines Transformators 29 ange schlossen. Das andere Ende der Sekundärwicklung 28 ist über eine Le-tung 27 mit dem Oberarm 2 nd dami.t mit dem Außenmantel 7 verbunden.The electrode tube 12 is connected to a terminal 26, a line 27 to the secondary winding 28 of a transformer 29 is connected. The other end the secondary winding 28 is connected to the upper arm 2 nd dami.t via a line 27 the outer jacket 7 connected.

Im Primärkreis des Transformators 29 liegt ein Schalter 30.A switch 30 is located in the primary circuit of the transformer 29.

der über ein Stromsteuergerät 31 den Strom zur Erhitzung der Elektrode 6 selbständig und zeitgerecht schaltet.which, via a current control device 31, supplies the current for heating the electrode 6 switches independently and on time.

Ein Elektrodenkraftsteuergerät 32 weist eine Steuerleitunse 32' auf, die zu einer an sich bekannten, der einfachheithalber nicht dargestellten, Vorrichtung zur Verstellung des Oberarrues 2 führt. Das Elektrodenkraftsteuergerät 52 bestimmt selbsttätig und zeitgereont die Hubbewegung der Elektrode 6 und das Steuergerät 33 beeinflußt ebenfalls selbsttätig und zeitgerecht die Schaltung des Magnetven tils 23.An electrode force control device 32 has a control line 32 ', to a device known per se, not shown for the sake of simplicity leads to the adjustment of the upper arm 2. The electrode force control device 52 determines the stroke movement of the electrode 6 and the control unit are automatic and timely 33 also automatically and timely influences the switching of the Magnetven tils 23.

Der Arbeitsablauf, insbesondere bei einem Stauohvorgang, ist wie folgt: Bei betriebsbereiter Schweißmaschine wird dan Kühlmittel, z.B. kühlwasser, über das Magnetventil 23, die Leitung 22 dem Ringspalt 13 der Elektrode 6 zugeleitat und über das Elektrodenrohr 12 kann dieses Kühlwasser über den Leitung anschluß 25 abfließen. Wird nun ein Arbeitsspiel ausgelöst, schaltet nach Absenken die Elektrode das Steuergerät 33 über das Magnetventil 23 die Kühlmittelzuflußleitung ab und die Preßluftzuleitung an. Anstatt mit Kühlwasser wird nun die Elektrode 6 über Leitung 22' mit Preßluft gespeist, dio anfangs das vorhandene Kühlwasser noch rasch zur dieser Elektrode drückt. Das Stromsteuergerät 31 schließt dann den Schalter 3C und die Elektrode 6 wird vom Strom durchflossen. Die El ektrode kann sich auf diese Weise sehr rasch aufheizen. Die erhitzte Elektrode 6 wird anschließend durch selbsttätige Auslösung der Hubbewegung durch das Steuergerät 32 auf den zu stauchenden Kunstatoffteil abgesenkt und übt im Zusammenwirken mit der Auflage die entsprechend notwendige Preßkraft aus. das zu stauchende Kunststoffteil erweicht und verformt sich entsprechend. Zeitgerecht steuert nun das Steuergerät 33 das Magnetvertil 23 wieder auf Kühl mittelzufuhr zur Elektrode 6 um, wodurch diese abkühlt. Daas Steuergerät 31 öffnet den Schalter 30 und die Stromzufuhr zur Elektrode 6 ist unterbrochen. Nach kurzenr Abkühlzeit der Elektrode 6 leitet das Steuergerät 32 die Rückhubewegung der Feiktiode 6 cii und da zu diesen Zeitpunkt der Elektrodenkopf 8 infolge der Kühlmittelbbeinflussung abgekült ist, löst sich der Elektrodenkopf glatt vom Kunststoffteil 5.The workflow, especially in the case of a traffic jam, is as follows: When the welding machine is ready for operation, coolant, e.g. cooling water, overflows the solenoid valve 23, the line 22 fed to the annular gap 13 of the electrode 6 and via the electrode tube 12, this cooling water can be connected via the line 25 drain. If a work cycle is now triggered, the electrode switches after lowering the control unit 33 via the solenoid valve 23 from the coolant inflow line and the Compressed air supply line. Instead of using cooling water, the electrode 6 fed with compressed air via line 22 ', initially the existing cooling water quickly presses on this electrode. The current controller 31 then closes the Switch 3C and electrode 6 have current flowing through them. The electrode can heat up very quickly in this way. The heated electrode 6 is then by the automatic triggering of the lifting movement by the control unit 32 towards the Upsetting plastic part is lowered and, in cooperation with the support, exercises the correspondingly necessary pressing force. the plastic part to be compressed softens and deforms accordingly. The control unit 33 now controls the solenoid valve in a timely manner 23 again on coolant supply to the electrode 6, whereby it cools. Daas Control unit 31 opens switch 30 and the power supply to electrode 6 is interrupted. After the electrode 6 has cooled down for a short time, the control unit 32 initiates the return stroke movement the Feiktiode 6 cii and since at this point in time the electrode head 8 due to the If the coolant flow has cooled down, the electrode head comes off the plastic part smoothly 5.

Das Arbeitsspiel wiederholt sich nach erneuter Auslösung.The working cycle repeats itself after another triggering.

Es versteht sich, daß die Folgezeiten der einzelnen Arbeitsphasen zeitlich einstellbar und veränderbar sind. So ist eH beispielsweise insbesondere beikleinen Bauteilen möglich, die Kühlung der Elektrode gleichzeitig mit oder erst nach dem Abheben der Elektrode eirlsuleiten.It goes without saying that the following times of the individual work phases are time-adjustable and changeable. For example, eH is special possible for small components, cooling of the electrode at the same time or first after removing the electrode.

Claims (7)

PatentansprücheClaims 1. Verfahren zum Verschweißen oder Warmstauchen von thermoplastischen Kunststoffteilen, bei dem nach kurzzeitigem Erweichen des Kunststoffteiles mittels einer vom elektrischen Strom durch Widerstanwärmung erhitzten Elektrode der Schweiß- oder Stauchdruck ausgeübt wird, dadurch gekennzeichnet, daß bei Verwendung einer elektrischer Widerstands-Punktschweißmaschine der erhitzte Kopf (8) einer der Elektroden (6) vorzugsweise vor Aufheben des Schweiß- oder Stauchdruckes durch ein durch den Flektrodenkopf hindurchgeleitetes Medium gekühlt wird 1. Process for welding or hot upsetting of thermoplastic Plastic parts, where after briefly softening the plastic part by means of an electrode of the welding or compression pressure is exerted, characterized in that when using a electrical resistance spot welding machine the heated head (8) of one of the electrodes (6) preferably before removing the welding or upsetting pressure by a through the The medium passed through the electrode head is cooled 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß während der Erhitzungsphase der Elektrode (6) ein gasförmiges Medium unter Druck durch den währen der Kühlphase vom Kühlmedium durchflossenen Elektrodenkühlkanal geleitet wird.2. The method according to claim 1, characterized in that during the heating phase of the electrode (6) a gaseous medium under pressure through which the cooling medium flows during the cooling phase Electrode cooling channel is passed. 3 v Vorrichtung nur Durchführung dc s Verfahrens nach don Ansprüchen 1 und 2, dadurch gekennzeichnet, daB eine elektrische Wiederstands-Punktschweißmaschine verwendet ist, daß eine der Elektroden (6) einen vom elektrischen Strom durchflossenen, durch Widerstandswärme erhitzten Elekrodenkopf (8) besitzt und da? der Elektrodenkopf (8) von einem Kanal (13) durchzogen ist, der zeitlich gesteuert, wechselweise an eine Kühlmittelquelle oder eine gasförmige Druckmittelquelle anschließ bar ist.3 v device only carrying out the method according to the claims 1 and 2, characterized in that an electrical resistance spot welding machine is used that one of the electrodes (6) has an electric current flowing through it, Has electrode head (8) heated by resistance heat and there? the electrode head (8) is traversed by a channel (13) which is timed, alternately on a coolant source or a gaseous pressure medium source is then connected bar. 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Elektrode (6) aus einem Elektroden-Außenmantel (7) aus elektirsch gut leitendem Material besteht, der an den einen Pol einer Stromquelle (29) angeschlossen ist und stirnseitig einen Mantelkopf (8) aus einer hochtemperaturfesten und sohlecht leitenden Material besitzt, daß konzentrisch zum Außenmantel (7) mit Abstand zu diesem ein Elektrodenrohr (12) aus elektrisch gut leitendem Material vorhanden ist, dessen stirnseitiges Ende sich über einen Rohrteil (15)aus hochtemperaturfestem und schlecht leitendem Material mit kleinem Querschnitt am Boden des Elektrodenkopfes abstützt und an den anren Pol der Stromquelle angeschlossen ist und daX der Ringspalt (1:) zwischen Elektroden-Außenmantel und Elektrodenrohr wechselweise an eine Quelle für Kühlmittel bzw. eine Quelle für Dolelrgas angeschlossen ist, während das Elektrodenrohr an eine Abflußleitung angeschlossen ist.4. Apparatus according to claim 3, characterized in that the electrode (6) consists of an electrode outer sheath (7) made of material with good electrical conductivity, which is connected to one pole of a power source (29) and one at the end Jacket head (8) made of a high temperature resistant and so bad leading Material has that concentric to the outer jacket (7) at a distance from this one Electrode tube (12) made of electrically conductive material is present, the frontal end over a pipe part (15) made of high temperature resistant and bad conductive material with a small cross-section at the bottom of the electrode head and is connected to the other pole of the power source and the annular gap (1 :) between the electrode outer jacket and the electrode tube alternately to a source for Coolant or a source of Dolelrgas is connected while the electrode tube is connected to a drain pipe. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Innere des Kopfes (8) des Elektrodenaußenmantels (7) sacklochförmig mit kegeligem Ende (11) ausgebildet ist und da Rohrteil (15) des Elektrodenrohres (12) sich mit abgeschrägter Mantelfläche gegen die kegelförmige Lochfläche abstützt.5. Apparatus according to claim 4, characterized in that the interior of the head (8) of the electrode outer jacket (7) in the shape of a blind hole with a conical end (11) is formed and since the tube part (15) of the electrode tube (12) is tapered The outer surface is supported against the conical hole surface. 6. Vorrichtung nach den Ansprüchen 3 bis 5, dadurch gekennzeichnet, -daß nur die dem Oberarm (2) zugeordnete Elektrode einer Punktschweißmaschine an eine elektrische Stromquelle angeschlossen ist, wogegen die dem Unterarm (3) zugeordnete y:lektrode als reines Abstützelement (4) ausgebildet ist.6. Device according to claims 3 to 5, characterized in that -that only the electrode of a spot welding machine assigned to the upper arm (2) an electrical power source is connected, whereas the one assigned to the forearm (3) y: electrode is designed as a pure support element (4). 7. Vorrichtung nach den Änsprächen 3 bis 5, dadurch gekennzeichnet, daß der elektrische Strom für die Elektrode, das Kühlmittel, das gasförmige Druckmittel und die Hubbewegung der Elektrode durch Zeitsteuergeräte (31, 32, 33) selbsttätig aufeinancierfolgend gesteuert sind.7. Device according to Änsprächen 3 to 5, characterized in that that the electric current for the electrode, the coolant, the gaseous pressure medium and the lifting movement of the electrode by time control devices (31, 32, 33) is automatic are controlled sequentially. L e e r s e i t eL e r s e i t e
DE19712114462 1971-03-25 1971-03-25 Welding thermoplastics - without sticking to the electrodes Pending DE2114462A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566338A1 (en) * 1992-04-10 1993-10-20 Kaysersberg Packaging S.A. Method for sealing the edge of fluted plastic boards

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566338A1 (en) * 1992-04-10 1993-10-20 Kaysersberg Packaging S.A. Method for sealing the edge of fluted plastic boards

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