DD154563A1 - METHOD AND DEVICE FOR PRODUCING A NIET CONNECTION FROM THERMOPLAST - Google Patents

METHOD AND DEVICE FOR PRODUCING A NIET CONNECTION FROM THERMOPLAST Download PDF

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Publication number
DD154563A1
DD154563A1 DD80225196A DD22519680A DD154563A1 DD 154563 A1 DD154563 A1 DD 154563A1 DD 80225196 A DD80225196 A DD 80225196A DD 22519680 A DD22519680 A DD 22519680A DD 154563 A1 DD154563 A1 DD 154563A1
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German Democratic Republic
Prior art keywords
item
heating
forming head
time
thermoplastic
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DD80225196A
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German (de)
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Porst Hagen
Joachim Rabitzsch
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Porst Hagen
Joachim Rabitzsch
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Priority to DD80225196A priority Critical patent/DD154563A1/en
Publication of DD154563A1 publication Critical patent/DD154563A1/en

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    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • 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
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • B29C66/814—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
    • B29C66/81431—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 comprising a single cavity, e.g. a groove
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • 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
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • 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

Abstract

Die Erfindung bezieht sich auf das Gebiet der Verarbeitung von Thermoplasten bzw. der Anwendung des Verfahrens und Vorrichtung bei der Herstellung von Radialluefterraedern. Das Ziel der Erfindung besteht darin, ein Verfahren und eine Vorrichtung zur Durchfuehrung der Mehrfachnietung in einem Werkzeug oekonomisch guenstig zu realisieren. Die Aufgabe besteht dabei darin, den Nietschaft aus Thermoplast so zu erwaermen, dass eine gute Umformung, verbunden mit hohen dynamischen Festigkeitseigenschaften erzielt wird. Erfindungsgemaess wird die Aufgabe dadurch geloest, dass in einem Werkzeug mehrere Heizschleifen, die aus duennen Bandmaterial ausgebildet sind, angeordnet werden und zur Umformung entsprechend die gleiche Anzahl Formkopfstempel durch die Heizschleifen gefuehrt werden, wobei erfindungsgemaess eine Verweilzeit des Formkopfstempels gepaart wird mit einer besonderen Ausbildung der Heizschleifen. Der Aufbau der Anordnung ist aus Figur 1 ersichtlich. Als Anwendungsgebiete der erfinderischen Loesung kann die Herstellung von Radiallaufraedern genannt werden.The invention relates to the field of processing of thermoplastics and the application of the method and apparatus in the manufacture of radial vibrancy wheels. The object of the invention is to realize a method and an apparatus for performing the multiple riveting in a tool economically favorable. The task here is to heat the rivet shank made of thermoplastic so that a good deformation, combined with high dynamic strength properties is achieved. According to the invention, the object is achieved in that a plurality of heating loops, which are formed of thin strip material are arranged in a tool and for forming the same number of form head punches are guided through the heating loops, according to the invention a residence time of the forming head punch is paired with a special training of heating loops. The construction of the arrangement can be seen from FIG. As fields of application of the inventive solution, the production of radial cantilevers can be mentioned.

Description

Titel der ErfindungTitle of the invention

Verfahren und Vorrichtung zur Herstellung einer Nietverbindung aus ThermoplastMethod and device for producing a riveted connection from thermoplastic

Anwendungsgebiet der ErfindungField of application of the invention

Die Erfindung bezieht sich auf das Gebiet der Verarbeitung von Thermoplasten. Ihre Anwendung ist insbesondere bei solchen Objekten gegeben, wo die Verformung von zylindrischen beziehungsweise rechteckigen Schaftquerschnitten sowie deren Kombinationen erfolgt, insbesondere bei Radiallufterrädern aus Thermoplast.The invention relates to the field of processing of thermoplastics. Their application is given in particular for such objects, where the deformation of cylindrical or rectangular shank cross-sections and their combinations, especially at radial air wheels made of thermoplastic.

Charakteristik der bekannten technischen LösungenCharacteristic of the known technical solutions

Beim Herstellen einer Verbindung von Plastteilen, insbesondere bei Radiallüfterrädern, besteht das Problem darin, neben einem ökonomischen Verfahren zur Plastifizierung des Materials auch eine hohe dynamische Kraftübertragung zu gewährleisten.When making a connection of plastic parts, especially in radial fan wheels, the problem is to ensure in addition to an economic process for plasticizing the material and a high dynamic power transmission.

Zur Verbindung νΰη Plastteilen miteinander sind bereits mehrere Lösungen bekannt, die mit Hilfe der Wärmeenergie die zu verbindenden Teile in einen plastifizierbaren Zustand versetzen; so zum Beispiel eine Form zur Herstellung von Kunststoff -Formkörpern aus thermisch härtbarem Material (BRD-OS-; 2332672). Diese Vorrichtung besteht aus einer Grundplatte und einem eine zylindrische Wand bildenden flexiblen Band, das zumindest teilweise aus elektrisch leitfähigem Material besteht-To connect νΰη plastic parts with each other already several solutions are known, which put the parts to be joined in a plasticizable state by means of heat energy; for example, a mold for the production of plastic moldings of thermally curable material (BRD-OS; 2332672). This device consists of a base plate and a flexible band which forms a cylindrical wall and consists at least partly of electrically conductive material.

Diese Ausführung hat den Nachteil, daß die Anordnung zu thermischen Schädigungen an den Stirnseiten der Nietschäfte führt bzw· es kommt zum Einbrand an den thermoplastischen PUgeteilen. Außerdem wird ein unvertretbar hoher Vorrichtungsaufwand erforderlich, bedingt durch eine schwenkbare Lagerung der aktiven Bewegungselemente.This embodiment has the disadvantage that the arrangement leads to thermal damage to the front sides of the rivet shanks or · it comes to the penetration of the thermoplastic PU parts. In addition, an unreasonably high device overhead is required, due to a pivotable mounting of the active movement elements.

Eine andere technische Lösung, bei der das Werkzeug beheizt wird und so lange einwirkt, bis eine Verformbarkeit des Werkstückes erreicht wird (DDR-WP-122492), bedeutet ein übliches Abschmelzen unter Wärme und Druck. Diese Art der Herstellung einer Plastverbindung bringt nicht die geforderten Festigkeitswerte, die bei einem dynamisch hoch beanspruchten Teil erforderlich sind.Another technical solution, in which the tool is heated and acts until a deformability of the workpiece is achieved (DDR-WP-122492), means a usual melting under heat and pressure. This type of production of a plastic connection does not bring the required strength values, which are required for a dynamically highly stressed part.

Gegenwärtig wird als Energiequelle bei der Herstellung von Plastradiallaufrädern die Schallenergie angewendet. Eine Kombination von Ultraschallwellen und Druck führt ebenfalls zu einer Verformung des thermoplastischen Materials. Dabei ist es nicht möglich, gleichzeitig eine Vielfachnietung über eine größere Fläche durchzuführen, da die Sonotrodenabmessungen zur Erreichung der erforderlichen. Schalleistung nicht ökonomisch realisierbar sind. Das gegenwärtig bekannte Verfahren gestattet nur die ein- oder zweifache Nietung mit ökonomischer Verfahrenstechnik. Die erforderliche Präzision zur Herstellung der Sonotroden über eine größere Fläche bereitet gegenwärtig noch große Schwierigkeiten.At present, the sound energy is used as an energy source in the production of plastic impellers. A combination of ultrasonic waves and pressure also leads to a deformation of the thermoplastic material. It is not possible at the same time to perform a multiple riveting over a larger area, since the sonotrode dimensions to achieve the required. Sound performance can not be economically realized. The currently known method allows only one or two riveting with economical processing technology. The precision required to produce the sonotrodes over a larger area is currently causing great difficulties.

Ziel der ErfindungObject of the invention

Das Ziel der Erfindung besteht darin, ein Verfahren und eine Vorrichtung zur Durchführung der Mehrfachnietung von thermoplastischen Werkstoffen untereinander sowie mit anderen Werkstoffen bei maximalen Festigkeitswerten von dynamisch hoch beanspruchten Plastkonstruktionen, insbesondere Radiallüfterrädern, zu entwickeln.The object of the invention is to develop a method and a device for carrying out the multiple riveting of thermoplastic materials with one another and with other materials at maximum strength values of dynamically highly stressed plastic constructions, in particular radial fan wheels.

Darlegung des Wesens der ErfindungExplanation of the essence of the invention

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Durchführung der Mehrfachnietung, beispielsweise bei Radiallüfterrädern, zu schaffen, wobei ein optimales Temperaturprofil ohne Einbrand am Werkstück in einem Werkzeug ökonomisch günstig zu realisieren ist.The invention has for its object to provide a method and apparatus for performing the multiple riveting, for example, in radial fan wheels, with an optimal temperature profile without penetration on the workpiece in a tool is economically feasible.

Erfindungsgemäß wird die Aufgabe durch ein Verfahren zur Herstellung einer Nietverbindung aus Thermoplast dadurch gelöst, daß der thermoplastische Nietschaft innerhalb einer Widerstandsheizschleife auf eine erforderliche Temperatur erwärmt und nach einer anschließenden Nachheizzeit von einem Formkopfstempel und nach einer Verweilzeit des Formkopfstempeis umgeformt wird. Weiterhin ist das Verfahren erfindungsgemäß dadurch gekennzeichnet, daß die Heizschleife beim Durchfahren des Formkopfstempels stromlos ist und keine Lageveränderung während des Nietvorgangs erfährt. Die erfindungsgemäße Nachheizzeit entspricht den Richtwerten der Warmformgebung von Thermoplast und beträgt cirka 10 Sekunden. Dabei beträgt erfindungsgemäß die Verweilzeit des Formkopfstempeis auf dem Werkstück cirka 20 % der Wärmeeinwirkungszeit. Die durch das Verfahren hergestellte Nietkopfverbindung hat ein Verhältnis von Nietschaftdicke zu Fußbreite des Nietkopfes zur Nietkopfhöhe von 1 : 2 : 1.According to the invention, this object is achieved by a method for producing a riveted thermoplastic compound by heating the thermoplastic rivet shank to a required temperature within a resistance heating loop and shaping it after a subsequent reheating time by a forming head die and after a residence time of the forming head master. Furthermore, the method according to the invention is characterized in that the heating loop is de-energized when driving through the Formkopfstempels and undergoes no change in position during the riveting process. The reheating time according to the invention corresponds to the standard values of the thermoforming of thermoplastic and is approximately 10 seconds. In this case, according to the invention, the residence time of the Formkopfstempeis on the workpiece about 20% of the heat exposure time. The rivet head joint produced by the process has a rivet stock foot width ratio of the rivet head to the rivet head height of 1: 2: 1.

Zur Durchführung des Verfahrens trägt erfindungsgemäß eine Vorrichtung bei, die sich dadurch auszeichnet, daß mehrere Widerstandsheizbänder als Heizschleifen mit unterschiedlich stromleitenden Querschnitt ausgebildet, in einem exakt definierten Abstand von den Nietschäften und die gleiche Anzahl Formkopfstempel in einem Werkzeug angeordnet sind. Vorteilhafterweise ermöglichen die Heizschleifen das Passieren der Formkopf stempel in ihrem Inneren, wobei die Hauptabstrahlrichtung der Wärmeenergie senkrecht zur Bewegungsrichtung der Forrakopfstempel erfolgt.To carry out the method according to the invention contributes to a device which is characterized in that a plurality of Widerstandsheizbänder formed as a heating coils with different current-conducting cross section, are arranged in a precisely defined distance from the rivet shanks and the same number of form head punches in a tool. Advantageously, the heating loops allow the stamping die to pass through in its interior, the main emission direction of the heat energy being perpendicular to the direction of movement of the forehead die.

Erfindungsgemäß sind die Heizschleifen in ihren Krümmungsradien durch Materialdopplungen verstärkt und durch die Anwendung dünner Widerstandsbandmaterialien zwischen 0,4 und 0,5 mm wird die Abstrahlung zum Fügeteil so weit reduziert, daß kein Einbrand erfolgt.According to the invention the heating loops are reinforced in their radii of curvature by material doubling and by the application of thin resistance band materials between 0.4 and 0.5 mm, the radiation is reduced to the joining part so far that no penetration takes place.

Die mit diesen Verfahren und Vorrichtung hergestellte Nietverbindung verfügt über eine hohe statische und dynamische Festigkeit im Bereich der zulässigen Dauerwärmebeanspruchung des Werkstoffs und ermöglicht eine ökonomische Betriebsweise durch die mit einem Werkzeug durchgeführte Mehrfachnietung.The riveting joint produced by these methods and apparatus has a high static and dynamic strength in the range of the permissible continuous heat stress of the material and allows an economical operation by the multiple riveting performed with a tool.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beiliegenden schematischen Zeichnungen näher erläutert.The invention is explained in more detail below with reference to embodiments with reference to the accompanying schematic drawings.

Wie sich aus Figur 1 ergibt, besteht die Vorrichtung aus einigen Heizschleifen 1 entsprechend der Anzahl der zu fertigenden Nietverbindungen und der gleichen Anzahl Formkopfstempel 2 senkrecht über den Heizschleifen, mit in den Radien angeordneten Materialdopplungen 3.As can be seen from FIG. 1, the device comprises a number of heating loops 1 corresponding to the number of rivet connections to be produced and the same number of forming head punches 2 perpendicular to the heating loops, with material doublings 3 arranged in the radii.

In Figur 2 ist schematisch die Nietkopfform 4 der Nietschaft 5 des Grundkörpers 6 und das Fügeteil 7 dargestellt.FIG. 2 schematically shows the rivet head shape 4 of the rivet shank 5 of the main body 6 and the joining part 7.

Mit der in Figur 1 und 2 dargestellten Anordnung wurden Versuche durchgeführt, wobei die Anzahl der gleichzeitig zu vernietenden Stempel 14 Stück beträgt, die auf einen Teilkreisdurchmesser von 390 mm angeordnet sind. Die Bewegung des Oberteils des Werkzeugs erfolgt auf pneumatisch technisch bekanntem Weg.With the arrangement shown in Figures 1 and 2 experiments were performed, wherein the number of simultaneously riveted punch 14 pieces, which are arranged on a pitch circle diameter of 390 mm. The movement of the upper part of the tool is carried out pneumatically technically known way.

Nach dem Einlegen der lose vorgefügten Radiallaufräder, Radboden mit Schaufeln und Raddüse werden die Nietschäfte 5 in den Wirkungsbereich der bereits auf Arbeitstemperatur erwärmten Heizschleifen 1 gefahren. Dabei wird zur Vermeidung eines Einbrands am Teil 7 ein erforderlicher Abstand von 1,5 mm eingehalten. Die Erwärmung der Heizschleife erfolgt durch den sich einstellenden Stromfluß entsprechend der angelegten Span-After inserting the loosely pre-fitted radial impellers, wheel bottom with blades and Raddüse the rivet shanks 5 are driven into the range of the already heated to working temperature heating coils 1. In this case, a required distance of 1.5 mm is maintained to avoid a burn-in on the part 7. The heating of the heating loop is carried out by the self-adjusting current flow according to the applied voltage

nung und Leitungsquerschnitt auf einen spezifischen Wert von 580 - 700 0C. Die Erwärmung des Nietschaftes erfolgt über die gesamte Plastifizierzeit einschließlich der dazu bedingten Verweilzeit· Die im Anschluß noch weitere Heizeinwirkung dient der Erhöhung der Festigkeit der Nietverbindung, insbesondere bei dynamischer Belastung. Nach dem Abschluß des Vorgangs prägt der Formkopfstempel den Nietkopf, indem er durch die Heizschleife bewegt wird· Der Stromfluß wird nach Beendigung der Nachheizzeit unterbrochen, so daß die Aufheizung des Formkopfstempels minimiert wird· Nach der Verweilzeit werden die Formkopfstempel wieder in die Ausgangslage gebracht· Durch die an den beiden Schmalseiten der Heizschleife verstärkten Materialquerschnitte ist die Abstrahlung geringer und verhindert auf diese Weise eine thermische Schädigung des Nietschaftes an den Stirnseiten.voltage and cable section to a specific value 580-700 0 C. The heating of the rivet shank takes place over the entire plasticizing including related to residence time · The increase the strength of the rivet connection is used in connection further heating effect, especially under dynamic loading. After completion of the process, the forming head stamping marks the rivet head by moving it through the heating loop. The flow of current is interrupted after the postheating time has ended so that the heating of the forming head punch is minimized. · After the residence time, the forming head punches are returned to the starting position the material cross-sections which are reinforced on the two narrow sides of the heating loop, the radiation is lower and prevents in this way a thermal damage to the rivet shank at the end faces.

Mit der erfindungsgemäßen Ausgestaltung des Verfahrens und der Vorrichtung lassen sich gegenüber den herkömmlichen technischen Lösungen wesentliche Zeiteinsparungen und Energieeinsparungen erreichen.The inventive design of the method and the device can be compared to the conventional technical solutions achieve significant time savings and energy savings.

In Figur 3 wird die nach dem Fügevorgang erzeugte Nietkopfform dargestellt, die gekennzeichnet ist' durch die Nietkopfhöhe h, die Fußbreite des Nietkopfes b und die Nietschaftdicke s. Entsprechend des erfindungsgemäßen Verhältnisses von s : h : b wie 1:1:2 entsteht eine Form, die hohen dynamischen Belastungen, wie sie besonders bei Radiallaufrädern auftreten, standhält. Die übrigen Parameter entsprechen den allgemein bekannten und angewandten Techniken bei der Verformung thermoplastischer Materialien.FIG. 3 shows the rivet head shape produced after the joining process, which is characterized by the rivet head height h, the foot width of the rivet head b and the rivet shank thickness s. According to the inventive ratio of s: h: b as 1: 1: 2 results in a shape that withstands high dynamic loads, as they occur especially in radial impellers. The other parameters correspond to the well-known and applied techniques for the deformation of thermoplastic materials.

Claims (9)

Erfindungsanspruchinvention claim 1· Verfahi-en zur Herstellung einer Nietverbindung aus Thermoplast gekennzeichnet dadurch, daß der thermoplastische Nietschaft (5) innerhalb einer Widerstandsheizschleife (1) auf eine erforderliche Temperatur erwärmt wird und nach einer anschließenden Nachheizzeit von einem Formkopfstempel (2), der die Heizschleife (4) durchfährt, umgeformt wird, wonach sich eine Verweilzeit des Formkopfstempeis (2) anschließt.Process for the production of a riveted connection made of thermoplastic, characterized in that the thermoplastic rivet shank (5) is heated to a required temperature within a resistance heating loop (1) and after a subsequent reheating time by a forming head punch (2) connecting the heating loop (4 ), is converted, followed by a residence time of the Formkopfstempeis (2) followed. 2· Verfahren nach Punkt 1 gekennzeichnet dadurch, daß die Heizschleife (1) beim Durchfahren des Formkopfstempeis (2) stromlos ist und während des Nietvorgangs keine Lageveränderung erfährt.2 · Method according to item 1, characterized in that the heating loop (1) when driving through the Formkopfstempeis (2) is de-energized and undergoes no change in position during the riveting operation. 3· Verfahren nach Punkt 1 gekennzeichnet dadurch, daß die Nachheizzeit, gerechnet von der Plastifizierzeit, die den Richtwerten der Warmformgebung von Thermoplast entspricht, bei Polypropylen ungefähr 10 Sekunden beträgt.Method according to item 1, characterized in that the post-heating time, calculated from the plasticizing time, which corresponds to the standard values of thermoforming of thermoplastics, is about 10 seconds for polypropylene. 4· Verfahren nach Punkt 1 gekennzeichnet dadurch, daß die Verweilzeit des Formkopfstempels auf dem Werkstück cirka 20 % der V/ärraeeinvjirkungszeit beträgt.4 Method according to item 1, characterized in that the residence time of the forming head punch on the workpiece is approximately 20 % of the working time. 5· Verfahren nach Punkt 1 gekennzeichnet dadurch, daß der durch das Verfahren entsprechend Punkt 1 bis 4 hergestellte Niet ein Verhältnis von s : h : b wie 1:1:2 besitzt·Method according to item 1, characterized in that the rivet produced by the method according to items 1 to 4 has a ratio of s: h: b such as 1: 1: 2 · 6. Vorrichtung zur Durchführung des Verfahrens nach Punkt 1 bis Punkt 5 gekennzeichnet dadurch, daß mehrere Widerstandsheizbänder als Heizschleifen nit unterschiedlich stromleitendem Querschnitt ausgebildet in einem exakt definierten Abstand von den Nietschäften und die gleiche Anzahl Formkopfstempel in einem Werkzeug angeordnet sind.6. Apparatus for carrying out the method according to item 1 to item 5, characterized in that a plurality of Widerstandsheizbänder nit heating coils as different leitleitendem formed in a precisely defined distance from the Nietschäften and the same number of form head punches are arranged in a tool. 7· Vorrichtung nach Punkt 6 gekennzeichnet dadurch, daß die Heizschleifen das Passieren der Formkopfstempel in ihrem Inneren ermöglichen und die Haupt abatrah.lrich.tung der War-Device according to point 6, characterized in that the heating loops allow the passage of the forming head punches in their interior and the main abatrah.lrich.tung the war meenergie senkrecht zur Bewegungsrichtung der Formkopfstempel angeordnet ist.meenergie is arranged perpendicular to the direction of movement of the forming head punches. 8. Vorrichtung nach Punkt 6 und 7 gekennzeichnet dadurch, daß die Heizschleifen in ihren Krümmungsradien durch Materialdopplungen verstärkt sind.8. The device according to item 6 and 7 characterized in that the heating coils are reinforced in their radii of curvature by material doubling. 9· Vorrichtung nach Punkt 6 bis 8 gekennzeichnet dadurch, daß die Materialdicke der Widerstandsbandraaterialien zwischen 0,4 bis 0,5 mm beträgt.Device according to items 6 to 8, characterized in that the material thickness of the resistance band materials is between 0.4 and 0.5 mm. Hierzu 1 Seite Zeichnungen For this 1 page drawings
DD80225196A 1980-11-14 1980-11-14 METHOD AND DEVICE FOR PRODUCING A NIET CONNECTION FROM THERMOPLAST DD154563A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1104223A3 (en) * 1999-11-26 2001-11-28 Heraeus Noblelight GmbH Apparatus for heating of thermoplasics parts and deforming method
FR2915413A1 (en) * 2007-04-24 2008-10-31 Peugeot Citroen Automobiles Sa Portable connected part e.g. sensor, assembling tool for road vehicle, has body made of heat conducting material with supporting surface, and recess arranged on supporting surface and longitudinally extending along surface
CN105939833A (en) * 2014-07-11 2016-09-14 建良Itt株式会社 Vehicle door trim bonding device
DE102016108290B3 (en) * 2016-05-04 2017-08-24 Lisa Dräxlmaier GmbH WELDING TOOL AND PROCESS FOR WELDING PLASTIC PARTS

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1104223A3 (en) * 1999-11-26 2001-11-28 Heraeus Noblelight GmbH Apparatus for heating of thermoplasics parts and deforming method
FR2915413A1 (en) * 2007-04-24 2008-10-31 Peugeot Citroen Automobiles Sa Portable connected part e.g. sensor, assembling tool for road vehicle, has body made of heat conducting material with supporting surface, and recess arranged on supporting surface and longitudinally extending along surface
CN105939833A (en) * 2014-07-11 2016-09-14 建良Itt株式会社 Vehicle door trim bonding device
EP3103620A4 (en) * 2014-07-11 2017-10-25 Gunyang Itt Co., Ltd. Vehicle door trim bonding device
CN105939833B (en) * 2014-07-11 2021-05-25 建良Itt株式会社 Automobile door trim joint device
DE102016108290B3 (en) * 2016-05-04 2017-08-24 Lisa Dräxlmaier GmbH WELDING TOOL AND PROCESS FOR WELDING PLASTIC PARTS

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