DE3138520A1 - Method of limiting the welding energy transmitted to the workpiece in ultrasonic plastic welding - Google Patents

Method of limiting the welding energy transmitted to the workpiece in ultrasonic plastic welding

Info

Publication number
DE3138520A1
DE3138520A1 DE19813138520 DE3138520A DE3138520A1 DE 3138520 A1 DE3138520 A1 DE 3138520A1 DE 19813138520 DE19813138520 DE 19813138520 DE 3138520 A DE3138520 A DE 3138520A DE 3138520 A1 DE3138520 A1 DE 3138520A1
Authority
DE
Germany
Prior art keywords
welding
energy
workpiece
limiting
ultrasonic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19813138520
Other languages
German (de)
Inventor
Wolfgang Dipl.-Ing. DDR 8044 Dresden Klimes
Jürgen Dipl.-Phys. Dr.rer.nat. DDR 8023 Dresden Punzel
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.)
SCHREIBGE STAMMBETRIEB MARKANT
Original Assignee
SCHREIBGE STAMMBETRIEB MARKANT
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 SCHREIBGE STAMMBETRIEB MARKANT filed Critical SCHREIBGE STAMMBETRIEB MARKANT
Publication of DE3138520A1 publication Critical patent/DE3138520A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/942—Measuring or controlling the joining process by measuring or controlling the time by measuring the time
    • 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

Abstract

Method of limiting the welding energy transmitted to the workpiece in ultrasonic plastic welding with the aim when welding plastic mouldings of melting only a defined volume in the welding zone and subsequently interrupting further energy supply via the vibratory unit. For this purpose, an electronic circuit forms a value proportional to the mechanical energy delivered by the ultrasonic transducer. If this value exceeds a limit value, the energy supply to the transducer is interrupted and the welding process is ended. The electrical no-load power of the ultrasonic transducer is not registered when forming the energy-proportional value.

Description

a) Titel der erfindunga) Title of the invention

Verfahren zur Begrenzung der auf das Werkstück übertragenen Schweißenergie beim Ultraschallplastfügen. Method of limiting the welding energy transferred to the workpiece in ultrasonic plastic joining.

b) Anwendungsgebiet der Erfindung erste zum zügen von Formteilen, bei denen die Fügeenergie mittels Ultraschall übertragen wird.b) Field of application of the invention first for drawing molded parts, where the joining energy is transmitted by means of ultrasound.

c) Charakteristik der bekannten technischen Lösung Beim Fügen mit Ultraschall wird über ein Schwingwerkzeug (Sonotrode) die für den Fügeprozeß notwendige Energie auf das Verkstück übertrarer. linie vom Fügeteil aufgenommene Ultraschalleistung wird von den gerätetechnischen Parametern Andruckkraft, Shcwingungssamplitude und Frequenz der Sonotrode bestimmt.c) Characteristics of the known technical solution When joining with Ultrasound is generated by a vibrating tool (sonotrode) that is necessary for the joining process Energy transferred to the block. line of the ultrasonic power absorbed by the part to be joined is determined by the device parameters pressure force, vibration amplitude and Frequency of the sonotrode is determined.

Für eine optimale Qualität des Fügeprozesses in einer Serienfertivung, insbesondere beim Schweißen von Plastformteilen, ist es notwendig, ein definiertes Volumen des Formteiles (Schweißfeder, T'tnergierichtungsgeber) aufzuschmelzen und anschließend die weitere Energiezufuhr über das Schwingwerkzeug zu unterbrechen. Kann diese Forderung nicht er -füllt werden, so erreicht die Verbindung nicht die zeforderte Festigkeit, oder überschüssig aufgeschmolzenes Plastmaterial tritt aus der Verbindungszone aus und fahrt zu fehlerhaften Formteilen. For an optimal quality of the joining process in a series production, especially when welding plastic molded parts, it is necessary to have a defined To melt the volume of the molded part (welding spring, energy direction generator) and then interrupt the further supply of energy via the vibrating tool. If this requirement cannot be met, the connection does not reach the Required strength, or excess melted plastic material escapes the connection zone and drives to faulty molded parts.

ioderne Ultraschallfügeanlagen sind daher mit einer Pro -grammsteuerung ausgerüstet, mit der die Einwirkungszeit des Ultraschalls auf das werkstück über eine einstellbare Schweißzeit begrenzt werden kann. Modern ultrasonic joining systems are therefore with a program control equipped, with which the exposure time of the ultrasound on the workpiece over an adjustable welding time can be limited.

Diese Programmsteuerung mit vorgegebener Schweißzeit sichert nur dann für jeden Arbeitstakt die gleiche Füge -energie, wenn sowohl die leistungsbestimmenden Parameter der Anlage (Andruckkraft, Schwingungsamplitude und Fre -quenz der Sonotrode), als auch die elastischen rigenschaften des Fügeteiles bei jedem Takt in gleicher Weise von der Zeit abhängen. This program control with a specified welding time only provides security then the same joining energy for each work cycle, if both the performance-determining System parameters (pressure force, vibration amplitude and frequency of the sonotrode), as well as the elastic properties of the joining part in the same way for every cycle Way depend on the time.

Schwankungen der angeführten Gerätetemperatur und Toleranzen der Fügeteile bewirken daher unterschiedliche Füge -energien pro Schweißtakt und damit Abweichungen vom ontimalen Wert. Fluctuations in the listed device temperature and tolerances of the Therefore, parts to be joined cause different joining energies per welding cycle and thus Deviations from the ontimal value.

d) Ziel der Erfindung Ziel der erfindung ist ein Verfahren zur Taktsteuerung einer Ultraschallfügeanlage, bei dem die Schweißzeit v a -r i a b e 1 als Funktion der in das Fügeteil eingekoppelten Energie bestimmt wird.d) Aim of the invention The aim of the invention is a method for clock control an ultrasonic joining system in which the welding time v a -r i a b e 1 as a function the energy coupled into the part to be joined is determined.

e) Darlegung des Wesens der Erfindung Ultraschallfügeanlagen sind mit elektromechani0chen "çTandlern ausgerüstet, die von einem elektrischen Generator gespeist werden. Die in das Fügeteil eingekoppelte mechanische Leistung ist näherungsweise linear abhur,gig von der elektrischen Leistungsaufnahme des vjandlers. Diese elektrische Leistung kann aus dem Verlauf von Strom und Jpannung am Wandler leicht ermittelt werden.e) Explanation of the essence of the invention are ultrasonic joining systems Equipped with electromechanical converters powered by an electric generator be fed. The mechanical power coupled into the part to be joined is approximate linear abhur, gig of the electrical power consumption of the vjandler. This electric Power can easily be determined from the course of current and voltage at the converter will.

Eine spezielle elektronische Schaltung bildet aus diesen elektrischen Parametern eine der vom Wandler abgegebenen mechanischen Energie prosortionale Größe. A special electronic circuit forms electrical from these Parameters one of the mechanical energy output by the transducer proportional size.

Erreicht diese Größe einen vorgegebenen Grenzwert, so wird die Energiezufuhr zum Wandler unterbrochen. If this variable reaches a predetermined limit value, the energy supply is reduced interrupted to the converter.

f) Ausführungsbeispiel Rei einem piezoelektrischen Ultraschallwandler, der mittels AF in Reihenresonanz gehalten wird, kann die energiepropor- tionale Größe allein aus des Spannungsverlauf während den Schwoißtaktes gewonnen werden, wenn der Strom durch den Wandler durch eine spezielle Schaltungstochnik des Generators zwecks Amplitudenkonstanz der mechanischen Schwingung unabhängig von der Belastung bleibt. Die Leerlaufleistung des Wandlers wird durch eine Kompensationsschaltung bei der Fildung der enorgieproportionalen Größe nicht erfaßt. Überschreitet diese energioproportionale Größe einen für das vorgegebene Füseteil optimalen Wert, so Wird die Energiezufuhr unterbrochen.f) Embodiment Rei a piezoelectric ultrasonic transducer, which is kept in series resonance by means of AF, the energy-proportional national Size can be obtained solely from the tension curve during the welding cycle, when the current through the converter is through a special circuit technology of the generator for the purpose of constant amplitude of the mechanical vibration independent of the load remain. The no-load power of the converter is compensated by a compensation circuit not included in the formation of the enormously proportional size. Exceeds this energy-proportional size an optimal value for the given foot part, see above The energy supply is interrupted.

Bei der Ermittlung der energieproportionalen Größe wird der Spannungsverlauf am Wandler währond der Einschwingphase der A.C-Schaltung nicht berücksichtigt.When determining the energy-proportional variable, the voltage curve not taken into account on the converter during the settling phase of the A.C circuit.

Claims (3)

Erfindungsansprüche erfahren zur Begrenzung der auf das Werkstück vibertragenen Schweißenergie beim Ultraschallplastfügen gekennzeichnet dadurch, daß die Einwirkungszeit des Ultraschalls auf das Fügeteil in Abhängigkeit von der dem elektromechanischen Wandler zugeführten rnergie bestimmt wird.Invention claims learn to limit the on the workpiece transferred welding energy during ultrasonic plastic joining characterized by that the action time of the ultrasound on the part to be joined depends on the the energy supplied to the electromechanical converter is determined. 2. erfahren nach Anspruch 1 gekennzeichnet dadurch, daQ bei der Signalgewinnung zur Begrenzung der Einwirkungszeit des Ultraschalls die elektrische leerlaufleisturg des Tand -lers kompensiert wird.2. experienced according to claim 1, characterized in that daQ in the signal generation to limit the exposure time of the ultrasound the electrical idle power of the Tand -ler is compensated. 3. Verfahren nach Anspruch 1 gekennzeichnet dadurch, daß bei der Signalgewinnung zur egrenzung der Einwirkungszeit des Ultraschalls die Einschwingphase einer AFC-Schaltung unberücksichtigt bleibt.3. The method according to claim 1, characterized in that in the signal generation the settling phase of an AFC circuit to limit the exposure time of the ultrasound remains unconsidered.
DE19813138520 1980-12-22 1981-09-28 Method of limiting the welding energy transmitted to the workpiece in ultrasonic plastic welding Withdrawn DE3138520A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD80226399A DD154343A1 (en) 1980-12-22 1980-12-22 PROCESS FOR LIMITING THE WELDING ENGINE TRANSMITTED TO THE WORKPIECE IN ULTRASOUND LUBRICANTS

Publications (1)

Publication Number Publication Date
DE3138520A1 true DE3138520A1 (en) 1983-01-05

Family

ID=5528156

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19813138520 Withdrawn DE3138520A1 (en) 1980-12-22 1981-09-28 Method of limiting the welding energy transmitted to the workpiece in ultrasonic plastic welding

Country Status (2)

Country Link
DD (1) DD154343A1 (en)
DE (1) DE3138520A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206013A2 (en) * 1985-06-28 1986-12-30 AB Tetra Pak Sealing device for the sealing of thermoplastic material
EP1190804A1 (en) * 2000-09-18 2002-03-27 Maschinenfabrik Spaichingen GmbH Process and device for ultrasonic welding of pieces
WO2004096480A1 (en) * 2003-04-30 2004-11-11 Schunk Ultraschalltechnik Gmbh Method for welding parts

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011119444A1 (en) 2011-11-25 2013-05-29 Ms Spaichingen Gmbh DEVICE AND METHOD FOR WELDING

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206013A2 (en) * 1985-06-28 1986-12-30 AB Tetra Pak Sealing device for the sealing of thermoplastic material
EP0206013A3 (en) * 1985-06-28 1987-09-30 Ab Tetra Pak A method for regulating the energy supply to a sealing device for the sealing of thermoplastic material
US4818313A (en) * 1985-06-28 1989-04-04 Tetra Pak International Method for regulating the energy supply to a sealing device for the sealing of thermoplastic material
EP1190804A1 (en) * 2000-09-18 2002-03-27 Maschinenfabrik Spaichingen GmbH Process and device for ultrasonic welding of pieces
US6752886B2 (en) 2000-09-18 2004-06-22 Maschinenfabrik Spaichingen Gmbh Method and apparatus for ultrasonic processing of workpieces
WO2004096480A1 (en) * 2003-04-30 2004-11-11 Schunk Ultraschalltechnik Gmbh Method for welding parts
US7491280B2 (en) 2003-04-30 2009-02-17 Schunk Ultraschalltechnik Gmbh Systems and methods for welding of parts
KR101067259B1 (en) * 2003-04-30 2011-09-27 쉔크 울트라샬테크니크 게엠베하 Method for welding parts

Also Published As

Publication number Publication date
DD154343A1 (en) 1982-03-17

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