EP3771289A1 - Device for heating a workpiece, in particular a roller bearing - Google Patents
Device for heating a workpiece, in particular a roller bearing Download PDFInfo
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- EP3771289A1 EP3771289A1 EP19188553.2A EP19188553A EP3771289A1 EP 3771289 A1 EP3771289 A1 EP 3771289A1 EP 19188553 A EP19188553 A EP 19188553A EP 3771289 A1 EP3771289 A1 EP 3771289A1
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- circuit
- workpiece
- driver
- driver circuit
- heating
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 230000005291 magnetic effect Effects 0.000 claims abstract description 31
- 230000006698 induction Effects 0.000 claims abstract description 26
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 3
- 230000005540 biological transmission Effects 0.000 claims abstract 3
- 238000000275 quality assurance Methods 0.000 claims abstract 2
- 239000000523 sample Substances 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 3
- 230000006978 adaptation Effects 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/14—Tools, e.g. nozzles, rollers, calenders
Definitions
- the present invention relates to a device for heating a workpiece, in particular a roller bearing.
- Devices for heating roller bearings are used to mount bearings or ring-shaped parts on a shaft or in the housing of a bearing without any effort.
- the thermal expansion of the metals is used to achieve the necessary clearance for fitting the bearing or the annular parts.
- induction heating devices are often used for rapid heating of the rolling bearing instead of, for example, hot oil baths, hot plates or ovens as they were used in the past.
- Such induction heating devices are available, for example, under the brand name "simatherm” from simatec AG, Wangen an der Aare, Switzerland. These induction heating devices are constructed with sheet iron cores, removable, movable or swiveling yokes and induction coil. The devices typically work on the frequency of the public power supply of 50Hz or 60Hz.
- the rolling bearing to be heated is placed over the induction coil or the yoke. Yokes of different sizes can also be arranged within the magnetic circuit to cover different roller bearing sizes.
- the rolling bearing is heated by means of a targeted flow of induction current in the inner ring of the rolling bearing.
- induction heating devices of this type are comparatively heavy and, depending on the weight of the roller bearing, sometimes require the suspension and removal of the roller bearing very considerable forces. In addition, such induction heating devices cannot be easily transported.
- the present invention is therefore based on the object of specifying a device for heating a workpiece, in particular a roller bearing, which is characterized by a low power consumption, a rapid warm-up phase, which enables, for example, a targeted heating of the roller bearing inner ring, and a low Weight and is therefore also very suitable for mobile use.
- the workpiece for example a roller bearing
- the workpiece can be heated very quickly and inductively, particularly on the side facing the magnet yoke.
- an increase in the efficiency of the heating device is achieved, which is achieved by adapting the driver circuit to the material properties, here in particular the magnetic one and electrical conductivity, of the metallic workpiece results.
- any vibrations caused by the magnetic reversal processes are in a frequency range that is particularly susceptible to the human ear.
- the yoke can be introduced into the magnetic circuit in a form-fitting manner in the asymmetrical U-core in the direction of two Cartesian coordinates.
- the two yoke supports do not require plane parallelism in production and reduce the vibrational movement by at least two directions.
- a bracing device only on one side is provided, which braces the introduced yoke against at least one yoke support point.
- the tension which can also act in the direction of the two aforementioned Cartesian coordinates, also makes a significant contribution to suppressing the possible acoustically unpleasant vibrations and enables safe working without hearing protection.
- the driver circuit can automatically select its operating point by tuning the frequency and / or the voltage of the intermediate circuit as a function of the impulse response, at least as close as possible to the optimal operating point and efficiency of the respective workpiece.
- At least one temperature probe is provided for measuring the temperature of the workpiece for setting the driver circuit.
- Operation with two temperature probes enables the controlled heating of sensitive workpieces in the differential temperature mode without exceeding a preselected temperature differential limit, which means that, for example, the temperature difference between the inner and outer ring of a rolling bearing can be safely regulated during the heating process.
- a timer circuit can also be provided in order to switch on the driver circuit for a predetermined period of time.
- the figure shows, in a schematic representation, a perspective view of a heating device 2 with a roller bearing 4 placed thereon.
- the heating device 2 comprises a magnetic circuit 8 formed from ferritic sheets 6, which is driven by an induction coil 10.
- the magnetic circuit 8 also has a magnetic yoke 12, which is designed to be removable, so that the roller bearing 4 can be stored on the magnetic yoke 12 for heating it.
- the magnet yoke 12 interacts with the corresponding support point 14 of the magnetic circuit 8 in such a way that a positive connection of the magnet yoke 12 and the magnetic circuit 8 results in two Cartesian coordinate directions indicated by arrows x, y.
- the end 13 is beveled and also has a small counter bearing 16 so that in this way the vibrations caused by the driving frequency of the induction coil 10 and thus the magnetic circuit 8 can already be damped.
- a tensioning device 20 is provided at the end 18 of the magnetic circuit 8 remote from the induction coil, with which the magnet yoke 12 can be tensioned downwards in the x-direction and in the y-direction against the end 14 on the induction coil.
- the mechanical vibrations caused by the driver frequency which due to their frequency of 200 to 1200 Hz also occur in an area that is particularly sensitive to the human ear, can be reliably avoided.
- the heating device also has a driver circuit 22 which, on the induction coil side, is designed as an electromagnetic resonant circuit with a driver frequency of 200 to 1200 Hz and has an intermediate circuit with variable voltage and / or frequency connected between the induction coil side and the supply voltage.
- the voltage and / or the frequency of the intermediate circuit can be adapted to the impulse response in the induction coil-side resonant circuit and optimized in such a way that the heating device is particularly efficient for all possible material properties of the metallic workpieces, here e.g. the roller bearing 4.
- the electrical conductivity and / or the magnetic susceptibility of the dominant metal component of the metallic workpiece are decisive here. It should therefore be mentioned at this point that the metallic workpiece can also have non-metallic components, such as trim pieces or bushings or insulating inserts made of plastic.
- the design of the driver circuit 22 depends largely on the weight of the workpieces 4 to be heated.
- the intermediate circuit has a voltage of 250 to 450 volts, a frequency of 400 to 650 Hz and a Power from 400 to 1400 watts.
- the digitally adjustable driver resonant circuit controls the induction coil sinusoidally depending on the electrical conductivity and the magnetic susceptibility of the workpiece and prevents the magnetic circuit from becoming saturated.
- the driver circuit 22 of the heating device 2 is designed in this exemplary embodiment in such a way that a coordination logic is provided for determining a workpiece-dependent advantageous operating point.
- the tuning logic tries automatically by tuning the frequency and voltage as a function of the impulse response, which works at least as close as possible to the optimal operating point and efficiency.
- the driver frequency and voltage can be tuned step-wise with a synthesizer, here in steps of 50 Hz and / or 50 volts, or then also smaller, in the vicinity of the maximum efficiency.
- At least one temperature probe 24, 25 for measuring the temperature of the roller bearing 4 is provided for setting the driver circuit 22.
- the temperature or temperature difference is thus the controlled variable at the input of the control circuit.
- a timer circuit can be provided in order to switch on the driver circuit 22 for a predeterminable period of time.
- the present heating device 2 therefore heats a roller bearing or, in general, any desired, preferably ring-shaped, metallic workpiece 4 quickly and inductively and is also distinguished by the compared to the Mains frequency of 50/60 Hz increased frequency due to its small size and can therefore also be brought to the desired location relatively easily.
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- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Anwärmen eines Werkstücks, insbesondere eines Wälzlagers, anzugeben, welche sich durch eine geringe Leistungsaufnahme, eine schnelle Anwärmphase und ein geringes Gewicht auszeichnet.The present invention is based on the object of specifying a device for heating a workpiece, in particular a roller bearing, which is characterized by low power consumption, a rapid heating phase and a low weight.
Die Aufgabe wird erfindungsgemäss durch eine Vorrichtung (2) zum Anwärmen eines metallischen Werkstücks (4), insbesondere eines Wälzlagers, gelöst, umfassend:
a) einen ferromagnetischen Magnetkreis (8) mit einem asymmetrischen U-Kern und abnehmbaren Magnetjoch (12);
b) einer Induktionsspule (10) für das Treiben des Magnetkreises (8);
c) einer Treiberschaltung (22) für die Induktionsspule (10), die die Induktionsspule (10) mit einer Wechselspannung von 200 bis 1200 Hz beaufschlagt;
d) einen mit der Treiberschaltung (22) assoziierten Rückkoppelkreis (22), der die Impulsantwort eines auf dem Magnetjoch (12) befindlichen Werkstücks (4) auf die Treiberspannung und/oder Treiberfrequenz detektiert und die Spannung und/oder Frequenz eines Zwischenkreises der Treiberschaltung (22) in Abhängigkeit von der detektierten Impulsantwort einstellt.
e) einer Funk Datenübertragung zu Smartphone/APP (26) zur Fernbedienung und elektronischen Ablage der Anwärmdaten zu Rückverfolgungs- und Qualitästsicherungsgründen.The object is achieved according to the invention by a device (2) for heating a metallic workpiece (4), in particular a roller bearing, comprising:
a) a ferromagnetic magnetic circuit (8) with an asymmetrical U-core and removable magnetic yoke (12);
b) an induction coil (10) for driving the magnetic circuit (8);
c) a driver circuit (22) for the induction coil (10) which applies an alternating voltage of 200 to 1200 Hz to the induction coil (10);
d) a feedback circuit (22) associated with the driver circuit (22), which detects the impulse response of a workpiece (4) on the magnetic yoke (12) to the driver voltage and / or driver frequency and the voltage and / or frequency of an intermediate circuit of the driver circuit ( 22) depending on the detected impulse response.
e) a wireless data transmission to smartphone / APP (26) for remote control and electronic storage of the heating data for reasons of traceability and quality assurance.
Auf diese Weise kann das Werkstück, beispielsweise ein Wälzlager, sehr schnell und induktiv besonders auf der dem Magnetjoch zugewendeten Seite aufgeheizt werden. Mit der Einstellbarkeit des Zwischenkreises wird eine Erhöhung des Wirkungsgrades der Anwärmvorrichtung erzielt, die aus der so realisierbaren Anpassung der Treiberschaltung auf die Materialeigenschaften, hier im Besonderen die magnetische und elektrische Leitfähigkeit, des metallischen Werkstücks resultiert.
Description
Die vorliegende Erfindung bezieht sich auf eine Vorrichtung zum Erwärmen eines Werkstücks, insbesondere eines Wälzlagers.The present invention relates to a device for heating a workpiece, in particular a roller bearing.
Vorrichtungen zum Erwärmen von Wälzlagern werden dazu eingesetzt, um Lager oder ringförmige Teile ohne Kraftaufwand auf eine Welle oder in das Gehäuse eines Lagers zu montieren. Dabei wird die Wärmeausdehnung der Metalle genutzt, um den erforderlichen Spielraum zum Einpassen des Lagers oder der ringförmigen Teile zu erlangen. Zur raschen Erwärmung des Wälzlagers werden heutzutage häufig Induktions-Anwärmgeräte anstelle von beispielsweise heissen Ölbädern, Wärmeplatten oder Öfen wie sie früher benutzt wurden, eingesetzt.Devices for heating roller bearings are used to mount bearings or ring-shaped parts on a shaft or in the housing of a bearing without any effort. The thermal expansion of the metals is used to achieve the necessary clearance for fitting the bearing or the annular parts. Nowadays, induction heating devices are often used for rapid heating of the rolling bearing instead of, for example, hot oil baths, hot plates or ovens as they were used in the past.
Derartige Induktionsanwärmgeräte sind beispielsweise unter dem Markennamen "simatherm" der simatec AG, Wangen an der Aare, Schweiz, erhältlich. Diese Induktionsanwärmgeräte sind mit geblechten Eisenkernen, wegnehmbaren, verschiebbaren oder schwenkbaren Jochen und Induktionsspule aufgebaut. Die Geräte arbeiten typischerweise auf der Frequenz der öffentlichen Stromversorgung von 50Hz bzw. 60Hz. Das anzuwärmende Wälzlager wird über die Induktionsspule oder das Joch aufgelegt. Zur Abdeckung verschiedener Wälzlagergrössen können auch verschieden grosse Joche innerhalb des Magnetkreises angeordnet werden. Die Erwärmung des Wälzlagers erfolgt über einen gezielt im Innenring des Wälzlagers angeregten Induktionsstromfluss.Such induction heating devices are available, for example, under the brand name "simatherm" from simatec AG, Wangen an der Aare, Switzerland. These induction heating devices are constructed with sheet iron cores, removable, movable or swiveling yokes and induction coil. The devices typically work on the frequency of the public power supply of 50Hz or 60Hz. The rolling bearing to be heated is placed over the induction coil or the yoke. Yokes of different sizes can also be arranged within the magnetic circuit to cover different roller bearing sizes. The rolling bearing is heated by means of a targeted flow of induction current in the inner ring of the rolling bearing.
Aus physikalischen Gründen bedingt sind derartige Induktionsanwärmgeräte aber vergleichsweise schwer und erfordern in Abhängigkeit von dem Gewicht des Wälzlagers für das Aufhängen und Abnehmen des Wälzlagers auch zum Teil ganz erhebliche Kräfte. Zudem können derartige Induktionsanwärmgeräte nicht einfach transportiert werden.For physical reasons, however, induction heating devices of this type are comparatively heavy and, depending on the weight of the roller bearing, sometimes require the suspension and removal of the roller bearing very considerable forces. In addition, such induction heating devices cannot be easily transported.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zum Anwärmen eines Werkstücks, insbesondere eines Wälzlagers, anzugeben, welche sich durch eine geringe Leistungsaufnahme, eine schnelle Anwärmphase, die zum Beispiel eine gezielte Anwärmung des Wälzlager-Innenrings ermöglicht, und sich durch ein geringes Gewicht auszeichnet und dadurch auch für den mobilen Einsatz sehr geeignet ist.The present invention is therefore based on the object of specifying a device for heating a workpiece, in particular a roller bearing, which is characterized by a low power consumption, a rapid warm-up phase, which enables, for example, a targeted heating of the roller bearing inner ring, and a low Weight and is therefore also very suitable for mobile use.
Die Aufgabe wird erfindungsgemäss durch eine Vorrichtung zum Anwärmen eines metallischen Werkstücks, insbesondere eines Wälzlagers, umfassend:
- a) einen ferromagnetischen Magnetkreis mit einem asymmetrischen U-Kern und abnehmbaren Magnetjoch;
- b) einer Induktionsspule für das Treiben des Magnetkreises;
- c) einer Treiberschaltung für die Induktionsspule, die die Induktionsspule mit einer Wechselspannung von 200 bis 1200 Hz beaufschlagt;
- d) einen Rückkoppelkreis, der die Impulsantwort, Strom- und Leistungsaufnahme eines auf dem Magnetjoch befindlichen Werkstücks auf die Treiberspannung und/oder Treiberfrequenz detektiert und die Spannung und/oder Frequenz eines Zwischenkreises der Treiberschaltung in Abhängigkeit von der detektierten Impulsantwort einstellt.
- a) a ferromagnetic magnetic circuit with an asymmetrical U-core and removable magnetic yoke;
- b) an induction coil for driving the magnetic circuit;
- c) a driver circuit for the induction coil which applies an alternating voltage of 200 to 1200 Hz to the induction coil;
- d) a feedback circuit that detects the impulse response, current and power consumption of a workpiece located on the magnetic yoke to the driver voltage and / or driver frequency and sets the voltage and / or frequency of an intermediate circuit of the driver circuit as a function of the detected impulse response.
Auf diese Weise kann das Werkstück, beispielsweise ein Wälzlager, sehr schnell und induktiv besonders auf der dem Magnetjoch zugewendeten Seite aufgeheizt werden. Mit der Einstellbarkeit des Zwischenkreises wird eine Erhöhung des Wirkungsgrades der Anwärmvorrichtung erzielt, die aus der so realisierbaren Anpassung der Treiberschaltung auf die Materialeigenschaften, hier im Besonderen die magnetische und elektrische Leitfähigkeit, des metallischen Werkstücks resultiert.In this way, the workpiece, for example a roller bearing, can be heated very quickly and inductively, particularly on the side facing the magnet yoke. With the adjustability of the intermediate circuit, an increase in the efficiency of the heating device is achieved, which is achieved by adapting the driver circuit to the material properties, here in particular the magnetic one and electrical conductivity, of the metallic workpiece results.
Da die Anwärmvorrichtung mit einer gegenüber der normalen Netzfrequenz von 50/60 Hz erhöhten Frequenz des Wechselstroms betrieben wird, liegen allfällige durch die Ummagnetisierungsvorgänge hervorgerufene Schwingungen in einem für das menschliche Ohr besonders empfänglichen Frequenzbereich. Zur Unterdrückung dieser Schwingungen ist es in einer Weiterbildung der vorliegenden Erfindung vorgesehen, dass das Joch formschlüssig im asymmetrischen U-Kern in Richtung von zwei kartesischen Koordinaten in den Magnetkreis einbringbar ist. Somit verlangen die beiden Jochauflagen keine Planparallelität in der Herstellung und vermindern die Schwingungsbewegung um mindestens zwei Richtungen.Since the heating device is operated with an alternating current frequency that is higher than the normal mains frequency of 50/60 Hz, any vibrations caused by the magnetic reversal processes are in a frequency range that is particularly susceptible to the human ear. To suppress these vibrations, a further development of the present invention provides that the yoke can be introduced into the magnetic circuit in a form-fitting manner in the asymmetrical U-core in the direction of two Cartesian coordinates. Thus, the two yoke supports do not require plane parallelism in production and reduce the vibrational movement by at least two directions.
Weiter kann es vorgesehen sein, zusätzlich oder alternativ eine nur einseitige Verspannvorrichtung vorzusehen, die das eingebrachte Joch gegen mindestens einen Jochauflagepunkt verspannt. Auch die Verspannung, die ebenfalls auch in der Richtung der beiden vorstehend genannten kartesischen Koordinaten wirken kann, trägt massgeblich zur Unterdrückung der möglichen akustisch unangenehmen Schwingungen bei, ermöglicht ein sicheres Arbeiten ohne Gehörschutz.It can further be provided that, in addition or as an alternative, a bracing device only on one side is provided, which braces the introduced yoke against at least one yoke support point. The tension, which can also act in the direction of the two aforementioned Cartesian coordinates, also makes a significant contribution to suppressing the possible acoustically unpleasant vibrations and enables safe working without hearing protection.
Zur Erzielung eines besonders guten Wirkungsgrades kann es vorgesehen sein, dass die Treiberschaltung ihren Arbeitspunkt automatisch durch ein Abstimmen der Frequenz und/oder der Spannung des Zwischenkreises in Abhängigkeit von der Impulsantwort zumindest möglichst nahe am optimalen Arbeitspunkt und Wirkungsgrad des jeweiligen Werkstücks wählt.To achieve particularly good efficiency, the driver circuit can automatically select its operating point by tuning the frequency and / or the voltage of the intermediate circuit as a function of the impulse response, at least as close as possible to the optimal operating point and efficiency of the respective workpiece.
Einerseits zu Vermeidung von Überhitzungen und andererseits aber auch zur Realisierung von vorgebbaren Aufheizprofilen kann es vorgesehen sein, dass mindestens eine Temperatursonde zur Messung der Temperatur des Werkstücks zur Einstellung der Treiberschaltung vorgesehen ist.On the one hand to avoid overheating and on the other hand also to realize predefinable heating profiles it can be provided that at least one temperature probe is provided for measuring the temperature of the workpiece for setting the driver circuit.
Der Betrieb mit zwei Temperatursonden ermöglicht ein kontrolliertes Anwärmen von empfindlichen Werkstücken im Differenz-Temperatur-Modus, ohne Überschreitung einer vorgewählten Temperatur-Differenz-Limite, dadurch kann zum Beispiel die Temperaturdifferenz zwischen Innen- und Aussenring eines Wälzlagers im Anwärmprozess sicher geregelt werden.Operation with two temperature probes enables the controlled heating of sensitive workpieces in the differential temperature mode without exceeding a preselected temperature differential limit, which means that, for example, the temperature difference between the inner and outer ring of a rolling bearing can be safely regulated during the heating process.
Ergänzend oder auch alternativ dazu kann auch eine TimerSchaltung vorgesehen sein, um die Treiberschaltung für eine vorgebbare Zeitdauer einzuschalten.In addition or as an alternative to this, a timer circuit can also be provided in order to switch on the driver circuit for a predetermined period of time.
Bevorzugte Ausführungsbeispiele der vorliegenden Erfindung werden nachfolgend anhand einer Zeichnung näher erläutert. Dabei zeigt die Figur in schematischer Darstellung eine perspektivische Ansicht eines Anwärmgeräts 2 mit einem aufgelegten Wälzlager 4. Das Anwärmgerät 2 umfasst einen aus ferritischen Blechen 6 gebildeten Magnetkreis 8, der von einer Induktionsspule 10 getrieben wird. Der Magnetkreis 8 weist ausserdem ein Magnetjoch 12 auf, das abnehmbar gestaltet ist, damit auf dem Magnetjoch 12 das Wälzlager 4 zu dessen Anwärmung gelagert werden kann. Am Induktionsspulen-seitigen Ende 13 des Magnetjochs 12 wirkt das Magnetjoch 12 mit dem entsprechenden Auflagepunkt 14 des Magnetkreises 8 so zusammen, dass sich eine formschlüssige Verbindung von Magnetjoch 12 und Magnetkreis 8 in zwei durch Pfeile x, y angedeutete kartesische Koordinatenrichtungen ergibt. Hierzu ist das Ende 13 abgeschrägt und verfügt zudem über ein kleines Gegenlager 16, so dass auf diese Weise die durch die Treiberfrequenz der Induktionsspule 10 und damit des Magnetkreises 8 hervorgerufenen Schwingungen bereits so gedämpft werden können.Preferred embodiments of the present invention are explained in more detail below with reference to a drawing. The figure shows, in a schematic representation, a perspective view of a heating device 2 with a roller bearing 4 placed thereon. The heating device 2 comprises a
Zudem ist am Induktionsspulen-fernen Ende 18 des Magnetkreises 8 eine Verspannvorrichtung 20 vorgesehen, mit der das Magnetjoch 12 zum einen in der zeichnerischen Darstellung in x-Richtung nach unten und in y-Richtung gegen das Induktionsspulen-seitige Ende 14 verspannt werden kann. So können die durch die Treiberfrequenz hervorgerufenen mechanischen Schwingungen, die aufgrund ihrer Frequenz von 200 bis 1200 Hz auch noch in einem für das menschliche Ohr besonders sensitiven Bereich auftreten, sicher vermieden werden.In addition, a
Weiter weist das Anwärmgerät eine Treiberschaltung 22, die Induktionsspulen-seitig als elektromagnetischer Schwingkreis mit einer Treiberfrequenz von 200 bis 1200 Hz ausgestaltet ist und einen zwischen die Induktionsspulen-seitige Anschaltung und die Versorgungsspannung geschalteten Zwischenkreis mit variabler Spannung und/oder Frequenz aufweist. Dabei kann die Spannung und/oder die Frequenz des Zwischenkreises an die Impulsantwort im Induktionsspulen-seitigen Schwingkreis angepasst und so optimiert werden, dass sich ein besonders guter Wirkungsgrad des Anwärmgeräts für alle möglichen Materialeigenschaften der metallischen Werkstücke, hier z.B. des Wälzlagers 4, ergibt. Massgeblich sind dabei die elektrische Leitfähigkeit und/oder die magnetische Suszeptibilität des dominanten Metallbestandteils des metallischen Werkstücks. Es ist daher an dieser Stelle zu erwähnen, dass das metallische Werkstück durchaus auch nicht-metallische Bestandteile, wie Verkleidungsstücke oder Laufbuchsen oder Isoliereinlagen aus Kunststoff, aufweisen kann.The heating device also has a
Die Auslegung der Treiberschaltung 22 hängt dabei stark von dem Gewicht der anzuwärmenden Werkstücke 4 ab. Für ein Gewicht des Werkstücks im Bereich von 2 bis 20 kg beispielsweise hat der Zwischenkreis eine Spannung von 250 bis 450 Volt, eine Frequenz von 400 bis 650Hz und eine Leistung von 400 bis 1400 Watt. Der digital einstellbare Treiberschwingkreis steuert in Abhängigkeit von der elektrischen Leitfähigkeit und der magnetischen Suszeptibilität des Werkstücks die Induktionsspule sinusförmig an und verhindert eine Sättigung des magnetischen Kreises.The design of the
Die Treiberschaltung 22 des Anwärmgeräts 2 ist in diesem Ausführungsbeispiel so gestaltet, dass eine Abstimmungslogik zur Bestimmung eines Werkstück-abhängigen vorteilhaften Arbeitspunkts vorgesehen ist. Die Abstimmungslogik versucht automatisch durch ein Abstimmen von Frequenz und Spannung in Abhängigkeit der Impulsantwort einzustellen, die zumindest möglichst nahe am optimalen Arbeitspunkt und Wirkungsgrad arbeitet. Hierzu kann die Treiberfrequenz und Spannung mit einem Synthesizer stufenartig durchgestimmt werden, hier vorliegend in Schritten von 50Hz und/oder 50Volt, oder dann auch kleiner, in der Nähe des maximalen Wirkungsgrades.The
Um infolge einer Überhitzung auftretende Gefügeveränderungen des metallischen Wälzlagers 4 sicher ausschliessen zu können, ist mindestens eine Temperatursonde 24,25 zur Messung der Temperatur des Wälzlagers 4 zur Einstellung der Treiberschaltung 22 vorgesehen. Für eine diesbezügliche Regelung ist die Temperatur oder Differenztemperatur somit die Regelgrösse am Eingang des Regelkreises. Alternativ oder auch ergänzend zu der vorstehenden Temperatureinstellung oder Differenz-Temperatureinstellung kann eine Timerschaltung vorgesehen sein, um die Treiberschaltung 22 für eine vorgebbare Zeitdauer einzuschalten.In order to be able to reliably exclude changes in the structure of the metallic roller bearing 4 that occur as a result of overheating, at least one
Das vorliegende Anwärmgerät 2 wärmt daher ein Wälzlager oder allgemein auch jedes beliebige, vorzugsweise ringförmige, metallische Werkstück 4 schnell und induktiv auf und zeichnet sich zudem aufgrund der gegenüber der Netzfrequenz von 50/60 Hz erhöhten Frequenz durch eine geringe Baugrösse aus und lässt sich daher auch noch vergleichsweise gut an den gewünschten Einsatzort verbringen.The present heating device 2 therefore heats a roller bearing or, in general, any desired, preferably ring-shaped,
Claims (9)
dadurch gekennzeichnet, dass
das Magnetjoch (12) formschlüssig in Richtung von zwei kartesischen Koordinaten (x, y) in den Magnetkreis (8) einbringbar ist.Device (2) according to claim 1,
characterized in that
the magnetic yoke (12) can be introduced into the magnetic circuit (8) in a form-fitting manner in the direction of two Cartesian coordinates (x, y).
eine Verspannvorrichtung (20) vorgesehen ist, die das eingebrachte Magnetjoch (12) gegen mindestens einen Jochauflagepunkt (16) verspannt.Device (2) according to claim 1 or 2, characterized in that
a bracing device (20) is provided which braces the introduced magnetic yoke (12) against at least one yoke support point (16).
die Treiberschaltung (22) ihren Arbeitspunkt automatisch durch ein Abstimmen der Frequenz und/oder der Spannung des Zwischenkreises in Abhängigkeit von der Impulsantwort zumindest möglichst nahe am optimalen Arbeitspunkt und Wirkungsgrad des Werkstücks (4) wählt.Device (2) according to one of the preceding claims, characterized in that
the driver circuit (22) automatically reaches its operating point by adjusting the frequency and / or the voltage of the intermediate circuit as a function of the impulse response selects at least as close as possible to the optimal working point and efficiency of the workpiece (4).
eine Timerschaltung vorgesehen ist, um die Treiberschaltung (22) für eine vorgebbare Zeitdauer einzuschalten.Device (2) according to one of claims 1 to 6, characterized in that
a timer circuit is provided in order to switch on the driver circuit (22) for a predetermined period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19188553.2A EP3771289B1 (en) | 2019-07-26 | 2019-07-26 | Device for heating a workpiece, in particular a roller bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19188553.2A EP3771289B1 (en) | 2019-07-26 | 2019-07-26 | Device for heating a workpiece, in particular a roller bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3771289A1 true EP3771289A1 (en) | 2021-01-27 |
| EP3771289B1 EP3771289B1 (en) | 2022-10-26 |
Family
ID=67439056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19188553.2A Active EP3771289B1 (en) | 2019-07-26 | 2019-07-26 | Device for heating a workpiece, in particular a roller bearing |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP3771289B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202004014270U1 (en) * | 2004-09-10 | 2004-12-09 | Ab Skf | Induction heating device, has remote control for switching current on or off, and operable from position outside electromagnetic field generated during heating |
| WO2010037414A1 (en) * | 2008-09-30 | 2010-04-08 | Aktiebolaget Skf | Bearing heater |
| EP2391182A1 (en) * | 2010-05-26 | 2011-11-30 | simatec ag | Device for heating a workpiece, in particular a ball bearing |
| CN106304447A (en) * | 2015-06-11 | 2017-01-04 | 上海夥欣自动化科技有限公司 | Bearing heater |
-
2019
- 2019-07-26 EP EP19188553.2A patent/EP3771289B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202004014270U1 (en) * | 2004-09-10 | 2004-12-09 | Ab Skf | Induction heating device, has remote control for switching current on or off, and operable from position outside electromagnetic field generated during heating |
| WO2010037414A1 (en) * | 2008-09-30 | 2010-04-08 | Aktiebolaget Skf | Bearing heater |
| EP2391182A1 (en) * | 2010-05-26 | 2011-11-30 | simatec ag | Device for heating a workpiece, in particular a ball bearing |
| CN106304447A (en) * | 2015-06-11 | 2017-01-04 | 上海夥欣自动化科技有限公司 | Bearing heater |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3771289B1 (en) | 2022-10-26 |
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