DE2310245A1 - Heating/welding tool - for producing mitred plastic profile joints with curved working faces - Google Patents

Heating/welding tool - for producing mitred plastic profile joints with curved working faces

Info

Publication number
DE2310245A1
DE2310245A1 DE19732310245 DE2310245A DE2310245A1 DE 2310245 A1 DE2310245 A1 DE 2310245A1 DE 19732310245 DE19732310245 DE 19732310245 DE 2310245 A DE2310245 A DE 2310245A DE 2310245 A1 DE2310245 A1 DE 2310245A1
Authority
DE
Germany
Prior art keywords
welding tool
heating element
heating
working faces
welding
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
DE19732310245
Other languages
German (de)
Inventor
Wilfried Dipl-Ing Schaaf
Hermann Schwarz
Wolfgang Dipl-Ing Tobias
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.)
Zentralinstitut fuer Schweisstechnik der DDR
Original Assignee
Zentralinstitut fuer Schweisstechnik der DDR
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 Zentralinstitut fuer Schweisstechnik der DDR filed Critical Zentralinstitut fuer Schweisstechnik der DDR
Publication of DE2310245A1 publication Critical patent/DE2310245A1/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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • 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
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/022—Mechanical pre-treatments, e.g. reshaping
    • 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
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre 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
    • B29C66/05—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
    • B29C66/118—Single monotone curved joints
    • B29C66/1182—Single monotone curved joints the joint being C-shaped
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/524—Joining profiled elements
    • B29C66/5243—Joining profiled elements for forming corner connections, e.g. for making window frames or V-shaped pieces
    • B29C66/52431—Joining profiled elements for forming corner connections, e.g. for making window frames or V-shaped pieces with a right angle, e.g. for making L-shaped pieces
    • 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
    • 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
    • B29C66/81422—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 convex
    • 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
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2092—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" and involving the use of a facer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/001—Profiled members, e.g. beams, sections
    • B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section
    • B29L2031/005—Profiled members, e.g. beams, sections having a profiled transverse cross-section for making window frames

Abstract

In the tool the working faces, pref of elastic material are curved in a convex manner esp in the plane of the corner joint to be welded. Pref. stretching devices are arranged in the working faces for altering the curve of the faces. The formation of extra welded material on the outside of the mitred joint is avoided. High quality mitred joints are obtd.

Description

Heizelement-Schweißwerkzeug zum Gehrungsschweißen von Thermoplastprofil en Die Erfindung betrifft ein Heizelement-Schweißwerkzeug zum Gehrungsschweißen von Thermoplastprofilen, das geeignet ist, vorzugsweise an den Außenkanten eines Gehrungsstoßes Fehlschweißungen zu vermeiden.Heating element welding tool for miter welding of thermoplastic profiles The invention relates to a heating element welding tool for miter welding of thermoplastic profiles that is suitable, preferably on the outer edges of a Miter joint to avoid faulty welds.

Es ist bekannt, mittels des Heizelement-Stumpfschweiß-Verfahrens Gehrungsverbindungen an Thermoplastprofilen herzustellen.It is known to use the heating element butt welding process to make miter joints on thermoplastic profiles.

Dazu werden an sich bekannte Flächenheizkörper eingesetzt, mit deren ebenen Arbeitsflächen die zu verschweißenden Profile in Berührung gebracht werden, wodurch die Schweißflächen plastifiziert werden. Beim normalen Heizelement-Stumpfschweißen, bei dem die Achsen der zu verschweißenden Profile in einer Flucht liegen, tritt beim Verbinden der Profile über den gesamten Querschnitt des Materials ein nahezu gleichmäßiger Schweißdruck auf.For this purpose, surface heating elements known per se are used, with their the profiles to be welded are brought into contact with flat work surfaces, whereby the welding surfaces are plasticized. With normal heating element butt welding, in which the axes of the profiles to be welded are in alignment, occurs when connecting the profiles over the entire cross-section of the material a nearly even welding pressure.

Im Gegensatz dazu ergibt sich beim Gehrungsschweißen eine elastische Verformung des plastifizierten Werkstoffes. vorzugsweise der Außenkanten des Profiles, da hier der plastifizierte Werkstoff nach einer Richtung hin ausweichen kann. Hinzu kommt, daß der Kantenbereich durch die Strahlungswärme des Heizelementes zusätzlich erwärmt wird, so daß die Grenze der Erweichung des Thermoplastwerkstoffes, die sogenannte Erweichungsebenq gekrumst ist und im Kantenbereich weiter vom Heizelement-Schweißwerkzeug entfernt ist.In contrast, miter welding results in an elastic one Deformation of the plasticized material. preferably the outer edges of the profile, because here the plasticized material can give way in one direction. In addition comes that the edge area is additionally caused by the radiant heat of the heating element is heated so that the limit of softening of the thermoplastic material, the so-called Softening level is curved and further away from the heating element welding tool in the edge area away.

Der Schweißdruck an den Profilaußenkanten ist daher geringer als im Zentrum des Profilquerschnittes, was zu einer mangelhaften SchweiBverbindung bzw. zu einer Fehlschweißung an dieser Stelle führt. Dadurch wird die Festigkeit der gesamten Eckverbindung herabgesetzt.The welding pressure on the outer edges of the profile is therefore lower than in the Center of the profile cross-section, which leads to a defective welded joint or leads to a faulty weld at this point. This increases the strength of the entire corner connection reduced.

Es ist Zweck der Erfindung, bei der Herstellung von Gehrungsverbindungen Fehlschweißungen an den Außenkanten der Verbindung zu vermeiden und die Qualität der Verbindung zu verbessern.It is the purpose of the invention in the manufacture of miter joints Avoid incorrect welds on the outer edges of the connection and improve the quality improve the connection.

Der Erfindung liegt die Aufgabe zugrunde, ein Heizelement-Schweißwerkzeug für Gehrungsverbindungen zu entwickeln, mit dein ein gleichmäßiger Schweißdruck über die gesamte zu verschweißende Querschnittsfläche des Thermoplastpro fils zu erzielen ist.The invention is based on the object of a heating element welding tool for miter joints to develop an even welding pressure over the entire cross-sectional area of the thermoplastic profile to be welded is to achieve.

Erfindungsgemäß sind beide Arbeitsflächen des Heizelement-Schweißwerkzeuges in einer Ebene konvex gekrümmt ausgebildet. Die Krilnimungsebene des Schweißwerkzeuges und die Ebene der herzustellenden Winkelverbindung stimmen überein, so daß die die Außenkanten bildenden Querschnittsbereiche des Profils beim Erwärmen auf Schweißtemperatur so tief piastifiziert werden, daß der Ubergang des plastischen Bereiches zum festen Grundwerkstoff über den gesamten Querschnitt eine Ebene bildet. Beim Schweißvorgang wirken dann die unterschiedlich plastifizierten Profilquerschnitte ausgleichend auf den Aufbau des partiellen Schweißdruckes.Both working surfaces of the heating element welding tool are according to the invention formed convexly curved in one plane. The profile of the welding tool and the plane of the angular connection to be made coincide, so that the Cross-sectional areas of the profile that form outer edges when heated to welding temperature be so deeply plasticized that the transition from the plastic area to the solid area Base material forms a plane over the entire cross-section. During the welding process The differently plasticized profile cross-sections then have a compensating effect on the build-up of the partial welding pressure.

Die hervorstehenden Außenkanten des Profiles werden stärker gestaucht und erreichen den gleichen Schweißdruck und damit die gleiche #chweißqualität und Festigkeit wie die übrigen Querschnittsbereiche des Profiles.The protruding outer edges of the profile are compressed more and achieve the same welding pressure and thus the same # welding quality and Strength like the other cross-sectional areas of the profile.

Die Arbeitsflächen eines Heizelement-Schweißwerkzeuges, insbesondere für die Herstellung großer Stückzahlen von gleichen Gehrungsverbindungen, weisen eine auf das Werkstück abgestimmte feste konvexe Form auf, Ein universell einsetzbares Heizelement-Schweißwerkzeug ist dagegen durch eine in ihrem Krwmn#ungsradius veränderliche elastische Arbeitsfläche gekennzeichnet. Insbesondere kann eine elastische Deckplatte auf beiden Seiten des Schweißwerkzeuges angeordnet sein, deren Krümmung mittels einer Spannvorrichtung kontinuierlich oder stufenweise verändert werden kann.The working surfaces of a heating element welding tool, in particular for the production of large numbers of the same miter joints a solid convex shape tailored to the workpiece, a universally applicable one The heating element welding tool, on the other hand, has a variable radius of curvature marked elastic work surface. In particular, an elastic cover plate be arranged on both sides of the welding tool, the curvature by means of a clamping device can be changed continuously or in stages.

Die Erfindung soll nachstehend an einem Ausführungsbei spiel näher erläutert werden.The invention is to play in more detail below on a Ausführungsbei explained.

In der zugehörigen Zeichnung zeigen Fig. 1 s eine schematische Darstellung des erfindungagemäßen Heizelement Schweißwerkzeuges während des Erwärmens der zu schweißenden Profile Fig. 2 s die fertig geschweißte Verbindung Zur Herstellung von Eckverbindungen an Thermoplastprofilen 1 dient ein Heizelement-Schweißwerkzeug 2, dessen Arbeitsflächen 3 in einer Ebene so konvex gekrümmt sind, daß sich die Grenze der Plastifizierung des Thermoplastwerkstoffes, die Plastifizierungsebene 4, plan ausbildet.In the accompanying drawing, FIG. 1 s shows a schematic representation of the heating element welding tool according to the invention during the heating of the to welding profiles Fig. 2 s the finished welded connection for production A heating element welding tool is used for corner connections on thermoplastic profiles 1 2, the working surfaces 3 are so convexly curved in one plane that the Limit of plasticization of the thermoplastic material, the plasticization level 4, plan trains.

Dadurch treten beim Fügevorgang der Thermoplastprofile 1 zu einer Eckverbindung über die gesamte Verbindungsfläche 5 gleiche Druckverhältnisse auf.As a result, the thermoplastic profiles 1 become one during the joining process Corner connection over the entire connecting surface 5 on the same pressure conditions.

Claims (2)

Patentansprüche :Patent claims: 1. Heizelement-Schweißwerkzeug zum Gehrungsschweißen von Thermoplastprofilen, dadurch gekennzeichnet, daß die Arbeitsflächen (3) des Heizelement-Schweißwerkzeuges (2) vorzugsweise in der Ebene der zu schweißenden Eckverbindung konvex gekriimmt ausgebildet sind.1.Heating element welding tool for miter welding of thermoplastic profiles, characterized in that the working surfaces (3) of the heating element welding tool (2) preferably convexly curved in the plane of the corner connection to be welded are trained. 2. Heizelement-Schweißwerkzeug nach Anspruch 1, dadurch gekennzeichnet, daß die Arbeitsflächen (3) aus elastischem Material bestehen und an den Arbeitsflächen (3) Spannvorrichtungen zur kontinuierlichen oder stufenweisen Veränderung der Krümmung der Arbeitsflächen (3) angeordnet sind. 2. Heating element welding tool according to claim 1, characterized in that that the work surfaces (3) are made of elastic material and on the work surfaces (3) Jigs for changing the curvature continuously or in steps the work surfaces (3) are arranged. LeerseiteBlank page
DE19732310245 1972-04-07 1973-03-01 Heating/welding tool - for producing mitred plastic profile joints with curved working faces Pending DE2310245A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD16211072A DD97595A1 (en) 1972-04-07 1972-04-07

Publications (1)

Publication Number Publication Date
DE2310245A1 true DE2310245A1 (en) 1973-10-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19732310245 Pending DE2310245A1 (en) 1972-04-07 1973-03-01 Heating/welding tool - for producing mitred plastic profile joints with curved working faces

Country Status (2)

Country Link
DD (1) DD97595A1 (en)
DE (1) DE2310245A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0662390A2 (en) * 1993-12-28 1995-07-12 Kureha Kagaku Kogyo Kabushiki Kaisha Apparatus and method for welding thermoplastic resin members

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0662390A2 (en) * 1993-12-28 1995-07-12 Kureha Kagaku Kogyo Kabushiki Kaisha Apparatus and method for welding thermoplastic resin members
EP0662390A3 (en) * 1993-12-28 1996-08-21 Kureha Chemical Ind Co Ltd Apparatus and method for welding thermoplastic resin members.

Also Published As

Publication number Publication date
DD97595A1 (en) 1973-05-14

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