EP1459013B1 - Cooking device muffle and a method for the production of a cooking device muffle - Google Patents

Cooking device muffle and a method for the production of a cooking device muffle Download PDF

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Publication number
EP1459013B1
EP1459013B1 EP02781337A EP02781337A EP1459013B1 EP 1459013 B1 EP1459013 B1 EP 1459013B1 EP 02781337 A EP02781337 A EP 02781337A EP 02781337 A EP02781337 A EP 02781337A EP 1459013 B1 EP1459013 B1 EP 1459013B1
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EP
European Patent Office
Prior art keywords
metal plate
cooking appliance
muffle
sheet
edge
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Expired - Lifetime
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EP02781337A
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German (de)
French (fr)
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EP1459013A1 (en
Inventor
Peter Matauschek
Franz Deubzer
Hans Schuhegger
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/08—Foundations or supports plates; Legs or pillars; Casings; Wheels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49398—Muffler, manifold or exhaust pipe making

Definitions

  • the present invention relates to a cooking appliance muffle and a method for producing a cooking appliance muffle.
  • the muffle has at least two sheet-metal ends, which are connected to one another by means of a weld, from which sheet ends an inner-side first sheet metal end overlaps an outer-side second sheet-metal end, which forms a step-like transition between the sheet metal parts with its frontal sheet metal edge.
  • a cooking appliance muffle is shown for example in EP-A-0 254 500.
  • a muffle of a cooking appliance on plate ends which are arranged overlapped and are welded together.
  • step-like transitions between the two sheet-metal ends occur on the inside of the muffle.
  • Such step-like transitions can lead to a breakaway of the enamel slip and thus to an undesirably rough enamel surface.
  • Such roughened enamel surface is referred to as a so-called Zehrkante.
  • Crimp seam welding is a special form of seam welding of overlapped sheets.
  • the roller electrodes do not run in the sheet, but on the only briefly overlapped sheet edges.
  • the doughy under the action of the current zones are welded by the electrode force at the same time and almost leveled to single plate thickness.
  • the unilaterally leveled weld is easy to enamel, without Zehrkanten be formed by the demolition of enamel slip.
  • the object of the present invention is to provide a cooking appliance muffle and a method for producing the cooking appliance muffle, in which a crack-free enamel surface in the connection region of muffle sheet metal parts is made possible in a simple manner.
  • the object of the present invention is achieved by the Garellamuffel with the features of claim 1 and by the manufacturing method with the features of claim 13. Accordingly, the inside first end of the sheet is in the direction flattened wedge-shaped on its frontal sheet edge.
  • the inside step-like transition between the sheet ends is thus largely leveled.
  • the enamel slurry in the area of the step-like transition does not tear off. Due to the wedge geometry according to the invention of the inside of the sheet metal end, therefore, the trailing edge in the enamel surface in the area of the overlapping sheet metal ends is avoided.
  • the sheet thickness or the edge height can be reduced at the end face of the inside sheet metal end to 0 to 0.20 mm.
  • a maximum permissible value of this end-side sheet thickness is dependent on the layer thickness of the enamel layer.
  • an end-side sheet thickness of not more than 0.18 mm is permissible.
  • an enamel layer thickness of 120 ⁇ m end face sheet thicknesses of up to 0.15 mm are permissible, without the formation of secondary edges.
  • the enamel layer serves the purpose of protecting the muffle sheet from corrosion.
  • the enamel layer is designed as thin as possible in order to prevent stress cracks, for example in a pyrolysis operation of the cooking appliance.
  • the muffle sheet can be vertically pre-cut sheets.
  • the front side of the sheet ends therefore extends vertically, resulting in a pronounced step-like transition between the overlapping arranged sheet ends.
  • the pitch angle of the inventively formed wedge surface of the wedge-shaped flattened first end of the sheet can be between 10-35 °, in particular at 20 °. With this pitch angle, a sufficiently smooth transition for the enamel slurry is achieved.
  • the wedge surface is flat.
  • Such a flat wedge surface is particularly easy to produce by a roller rolling process.
  • the transition between the sheet ends can be further smoothed by bulging the wedge surface.
  • the wedge surface of the second wedge-shaped flattened sheet end may extend in the manner of a turning point line of its frontal sheet metal edge.
  • the width of the wedge-shaped flattened inside sheet metal end may be smaller than an edge distance of a weld seam connecting the sheet metal ends.
  • the wedge geometry of the inner side of the sheet metal during a welding process is not affected.
  • a sealing lip which extends along the end face.
  • the sealing lip is in pressure contact, preferably in line contact, with the first end of the sheet. This prevents liquids or impurities from getting into a gap formed between the plate ends after a welding operation, which can impair the subsequent enamel process.
  • the weld may be formed as a spot weld. Spot welding prevents excessive heat input into the sheet ends. Thermally induced deformations of the sheet ends during welding are thus avoided. It is advantageous if the welds are spaced over a pitch of 5-7 mm. As a result, on the one hand a sufficiently low heat input is ensured; On the other hand, the sheet metal ends are sufficiently tightly welded together.
  • the wedge surface can be produced by a cost-effective cold deformation of the garraum disorderen edge region of the overlapped sheet metal end.
  • the cold working can be carried out particularly effectively by a roll rolling method.
  • the sheet thicknesses used according to the invention between 0.4 and 0.8 mm, in particular 0.5 mm, are advantageous.
  • a sheet metal end with such Bleckdicke is on the one hand cost.
  • this sheet thickness excessive material displacement during cold working is avoided. By Material displacement caused deformation in the sheet metal end can be prevented.
  • a desired wedge geometry is therefore much easier to form than with sheet thicknesses greater than 0.8 mm.
  • FIG. 1 shows an enlarged detail of a muffle 1 for an oven.
  • the muffle 1 defines a cooking chamber 3 and has a first end of the sheet 7 and a second end of the sheet 5.
  • the sheet thickness s of the muffle sheet is 0.5 mm.
  • the two sheet ends 5 and 7 are by means of a the reference numeral 13 indicated spot weld joined together.
  • the resulting welding lenses are arranged at an edge distance a 1 of about 4 mm from a vertical end face 15 of the first sheet end 7. According to FIG. 1, the sheet thickness s on the vertical end face 15 is reduced to approximately 0.18 mm.
  • first sheet end 7 is flattened wedge-shaped in the direction of its end-side sheet edge 14.
  • a wedge surface 17 is formed as a flat inclined surface, with the inner side 19 of the muffle plate a first Edge line S 1 forms.
  • a second edge line S 2 is formed between the vertical end face 15 of the second sheet end 7 and the wedge surface 17.
  • Both edge line S 1 and S 2 span a wedging plane ER.
  • this wedging plane ER includes a pitch angle ⁇ of approximately 20 ° with the muffle inner side 19.
  • the transitions in the region of the edge lines S 1 and S 2 are preferably rounded.
  • the width a 2 of the wedge-shaped flattened sheet end 7 is kept smaller than the edge distance a 1 of the weld seam 11.
  • the welding lenses 13 of the weld are not provided in the region of the wedge surface 17. An impairment of the wedge geometry by the weld 13 is thus avoided.
  • the welding lenses of the weld 13 are spaced over a pitch e of about 6 mm. On the one hand, this allows sufficient tightness between the first and second sheet metal end.
  • the heat load of the sheet metal ends 5 and 7 during the welding process - compared to a consistently formed weld, as is necessary in Quetschnahtsch Strukturen - sufficiently low.
  • the sheet ends 5 and 7 of the muffle 1 are coated according to the figure 1 with an enamel layer 21, whose average layer thickness is about 150 microns. Due to the flattened wedge surface 17, the enamel layer 21 has a crack-free surface in the region between the first and second plate ends 5, 7. The surface of the enamel layer 21 therefore extends smoothly over the end face 13 of the first sheet metal end 5, without forming disadvantageous Zehrkanten.
  • FIG. 3 shows a second exemplary embodiment in a schematic side sectional view.
  • the wedging plane E R indicated by the dashed line-as in the first embodiment -includes a wedge angle ⁇ of approximately 20 °.
  • the wedge surface 17 is formed bulged and protrudes from the wedging plane ER.
  • the sheet thickness s is in this embodiment at the end face 15 at 0 mm; ie the first end of the sheet 7 extends at an acute angle to its end face 15. The transition between the sheet metal ends is thereby even more smooth.
  • FIG. 4 shows a third exemplary embodiment in which a sealing lip 23 is formed on the vertical end face 15 of the second sheet metal end 7.
  • the sealing lip 23 is formed at the first sheet end 5 facing bottom of the second sheet end 7.
  • the sealing lip 23 is pressed in line contact with the first sheet end 5.
  • a gap 10 between the first and second plate end 5, 7 is closed. Liquids or impurities can therefore not penetrate into the gap 10 after the welding process and affect the subsequent enamelling process.
  • FIG. 5 A fourth exemplary embodiment is sketched in FIG. 5 in a schematic side view.
  • the wedge-shaped flattened plate end 7 in the manner of a turning point line to the end-side sheet edge 14 is curved.
  • the basic method for producing the muffle 1 is indicated. Consequently, in a first method step 25, the sheet ends 5 and 7 cut dimensionally vertical. Subsequently, in a deformation step 27, the second sheet end 7 is cold-worked, whereby the wedge surface 17 is formed. Due to the sheet thickness s of o, 5 mm used, only a slight material displacement in the sheet end 7 is advantageously caused during cold forming. Unwanted deformations in the region of the sheet end 7, which are caused by the material displacement, are therefore largely avoided. The transition between the sheet ends 5 and 7 is thus not affected by material displacement.
  • the sheet metal ends 5, 7 are joined together by a welding process.
  • any welding methods such as a point, a roll point, a seam seam or a laser welding process.
  • the spot welding process has proved to be particularly advantageous.
  • the amount of heat supplied is comparatively low. Heat-induced deformations of the sheet ends 5, 7 can be avoided.
  • the sheet ends 5, 7 subjected to an enamelling process in which the sheet ends 5, 7 are coated with an enamel layer 21 of a layer thickness of 80 to 120 microns.
  • the enamel layer serves the purpose of protecting the sheet metal ends from corrosion.
  • the enamel layer as thin as possible to prevent stress cracks, for example, in a pyrolysis operation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Baking, Grill, Roasting (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Muffles for cooking devices are preferably formed with an enameled layer on the inner side. The muffles contain at least two sheet metal ends that are connected together by welding. A first sheet metal end disposed on the inner side covers a second sheet end disposed on the outer side and forms a step-type transition between the two sheet end with the front surface of the sheet edge thereof. In order to prevent uneven edges in the enamel layer in the region of the step-type transition, the inner side of the first sheet end is flattened to a wedge-shaped form in the direction of the front side of the sheet edge.

Description

Die vorliegende Erfindung betrifft eine Gargerätemuffel sowie ein Verfahren zur Herstellung einer Gargerätemuffel. Die Muffel weist zumindest zwei Blechenden auf, die mittels einer Schweißnaht miteinander verbunden sind, von welchen Blechenden ein innenseitiges erstes Blechende ein außenseitiges zweites Blechende überlappt, welches erste Blechende mit seiner stirnseitigen Blechkante einen stufenartigen Übergang zwischen den Blechteilen bildet. Eine derartige Gargerätemuffel ist beispielsweise in EP-A-0 254 500 gezeigt.The present invention relates to a cooking appliance muffle and a method for producing a cooking appliance muffle. The muffle has at least two sheet-metal ends, which are connected to one another by means of a weld, from which sheet ends an inner-side first sheet metal end overlaps an outer-side second sheet-metal end, which forms a step-like transition between the sheet metal parts with its frontal sheet metal edge. Such a cooking appliance muffle is shown for example in EP-A-0 254 500.

Üblicherweise weist eine Muffel eines Gargeräts Blechenden auf, die überlappt angeordnet sind und miteinander verschweißt sind. Dadurch entstehen auf der Innenseite der Muffel stufenartige Übergänge zwischen den beiden Blechenden. Während eines Emailliervorgangs kann es an diesen stufenartigen Übergängen zu einem Abriß des Emailschlickers und somit zu einer unerwünscht rauen Emailoberfläche kommen. Eine derart aufgeraute Emailoberfläche wird als sogenannte Zehrkante bezeichnet.Usually, a muffle of a cooking appliance on plate ends which are arranged overlapped and are welded together. As a result, step-like transitions between the two sheet-metal ends occur on the inside of the muffle. During an enamelling process, these step-like transitions can lead to a breakaway of the enamel slip and thus to an undesirably rough enamel surface. Such roughened enamel surface is referred to as a so-called Zehrkante.

Aus der DE 42 08 596 ist ein Verfahren zur Verbindung zweier Bleche, insbesondere zweier Karosseriebleche, mittels einer Quetschnahtschweißung bekannt. Das Quetschnahtschweißen ist eine Sonderform des Rollennahtschweißens überlappter Bleche. Dabei laufen die Rollenelektroden nicht im Blech, sondern auf den nur kurz überlappten Blechkanten. Die unter der Wirkung des Stromes teigig werdenden Zonen werden durch die Elektrodenkraft gleichzeitig geschweißt und fast auf Einzelblechdicke eingeebnet. Die einseitig eingeebnete Schweißnaht ist problemlos zu emaillieren, ohne dass Zehrkanten durch den Abriß des Emailschlickers gebildet werden.From DE 42 08 596 a method for connecting two sheets, in particular two body panels, by means of a Quetschnahtschweißung known. Crimp seam welding is a special form of seam welding of overlapped sheets. The roller electrodes do not run in the sheet, but on the only briefly overlapped sheet edges. The doughy under the action of the current zones are welded by the electrode force at the same time and almost leveled to single plate thickness. The unilaterally leveled weld is easy to enamel, without Zehrkanten be formed by the demolition of enamel slip.

Die Aufgabe der vorliegenden Erfindung besteht darin, eine Gargerätemuffel sowie ein Verfahren zur Herstellung der Gargerätemuffel bereitzustellen, bei der in einfacher Weise eine rissfreie Emailoberfläche im Verbindungsbereich von Muffelblechteilen ermöglicht ist.The object of the present invention is to provide a cooking appliance muffle and a method for producing the cooking appliance muffle, in which a crack-free enamel surface in the connection region of muffle sheet metal parts is made possible in a simple manner.

Die Aufgabe der vorliegenden Erfindung ist durch die Gargerätemuffel mit den Merkmalen des Patentanspruches 1 sowie durch das Herstellungsverfahren mit den Merkmalen des Patentanspruches 13 gelöst. Demgemäß ist das innenseitige erste Blechende in Richtung auf seine stirnseitige Blechkante keilförmig abgeflacht. Der innenseitige stufenartige Übergang zwischen den Blechenden ist somit weitgehend eingeebnet. Beim Emaillieren der Muffelinnenseite reißt daher der Emailschlicker im Bereich des stufenartigen Übergangs nicht ab. Aufgrund der erfindungsgemäßen Keilgeometrie des innenseitigen Blechendes sind somit Zehrkante in der Emailoberfläche im Bereich der überlappend angeordneten Blechenden vermieden.The object of the present invention is achieved by the Gargerätemuffel with the features of claim 1 and by the manufacturing method with the features of claim 13. Accordingly, the inside first end of the sheet is in the direction flattened wedge-shaped on its frontal sheet edge. The inside step-like transition between the sheet ends is thus largely leveled. When enameling the muffle inside, therefore, the enamel slurry in the area of the step-like transition does not tear off. Due to the wedge geometry according to the invention of the inside of the sheet metal end, therefore, the trailing edge in the enamel surface in the area of the overlapping sheet metal ends is avoided.

In einer besonders vorteilhaften Ausführung der Erfindung kann die Blechdicke bzw. die Kantenhöhe an der Stirnseite des innenseitigen Blechendes auf 0 bis 0,20 mm reduziert sein. Dabei ist ein maximal zulässiger Wert dieser stirnseitigen Blechdicke abhängig von der Schichtdicke der Emailschicht. Beispielsweise ist bei einer Emailschichtdicke von 150 µm eine stirnseitige Blechdicke von maximal 0,18 mm zulässig. Bei einer Emailschichtdicke von 120 µm sind stirnseitige Blechdicken von bis zu 0,15 mm zulässig, ohne dass sich Zehrkanten ausbilden. Die Emailschicht erfüllt den Zweck, das Muffelblech vor Korrosion zu schützen. Vorteilhafterweise ist die Emailschicht möglichst dünn ausgelegt, um Spannungsrisse beispielsweise bei einem Pyrolysebetrieb des Gargeräts zu verhindern.In a particularly advantageous embodiment of the invention, the sheet thickness or the edge height can be reduced at the end face of the inside sheet metal end to 0 to 0.20 mm. In this case, a maximum permissible value of this end-side sheet thickness is dependent on the layer thickness of the enamel layer. For example, with an enamel layer thickness of 150 μm, an end-side sheet thickness of not more than 0.18 mm is permissible. With an enamel layer thickness of 120 μm, end face sheet thicknesses of up to 0.15 mm are permissible, without the formation of secondary edges. The enamel layer serves the purpose of protecting the muffle sheet from corrosion. Advantageously, the enamel layer is designed as thin as possible in order to prevent stress cracks, for example in a pyrolysis operation of the cooking appliance.

Zur Vereinfachung der Fertigung des Muffelblechs können vertikal vorgeschnittene Bleche werden. Die Stirnseite der Blechenden verläuft daher vertikal, wodurch sich ein ausgeprägter stufenartiger Übergang zwischen den überlappend angeordneten Blechenden ergibt. Mittels der erfindungsgemäßen Keilgeometrie am innenseitigen Blechende kann - trotz des Vertikalschnitts der Muffelbleche - eine glatte Emailschicht erreicht werden.To simplify the manufacture of the muffle sheet can be vertically pre-cut sheets. The front side of the sheet ends therefore extends vertically, resulting in a pronounced step-like transition between the overlapping arranged sheet ends. By means of the wedge geometry according to the invention on the inside of the sheet metal end can - despite the vertical section of the muffle plates - a smooth enamel layer can be achieved.

Der Steigungswinkel der erfindungsgemäß gebildeten Keilfläche des keilförmig abgeflachten ersten Blechendes kann zwischen 10-35°, insbesondere bei 20°, liegen. Mit diesem Steigungswinkel ist ein ausreichend glatter Übergang für den Emailschlicker erreicht.The pitch angle of the inventively formed wedge surface of the wedge-shaped flattened first end of the sheet can be between 10-35 °, in particular at 20 °. With this pitch angle, a sufficiently smooth transition for the enamel slurry is achieved.

In einer fertigungstechnisch einfachen Ausführungsform der Erfindung ist die Keilfläche eben ausgebildet. Eine derart ebene Keilfläche ist besonders einfach durch ein Rollenwalzverfahren herstellbar. Der Übergang zwischen den Blechenden kann weiter geglättet werden, indem die Keilfläche ausgebaucht wird.In a manufacturing technology simple embodiment of the invention, the wedge surface is flat. Such a flat wedge surface is particularly easy to produce by a roller rolling process. The transition between the sheet ends can be further smoothed by bulging the wedge surface.

Für einen besonders glatten Übergang zwischen den Blechenden kann die Keilfläche des zweite keilförmig abgeflachte Blechende nach Art einer Wendepunktlinie seiner stirnseitigen Blechkante hin verlaufen.For a particularly smooth transition between the sheet metal ends, the wedge surface of the second wedge-shaped flattened sheet end may extend in the manner of a turning point line of its frontal sheet metal edge.

Vorteilhaft kann die Breite des keilförmig abgeflachten innenseitigen Blechendes kleiner sein als ein Randabstand einer die Blechenden verbindenden Schweißnaht. Dadurch wird die Keilgeometrie des innenseitigen Blechendes während eines Schweißvorganges nicht beeinträchtigt.Advantageously, the width of the wedge-shaped flattened inside sheet metal end may be smaller than an edge distance of a weld seam connecting the sheet metal ends. As a result, the wedge geometry of the inner side of the sheet metal during a welding process is not affected.

In einer weiteren Ausführung der Erfindung kann an der Stirnseite des überlappt angeordneten innenseitigen Blechendes eine Dichtlippe ausgebildet sein, die sich längs der Stirnseite erstreckt. Die Dichtlippe ist in einem Druckkontakt, bevorzugt in Linienkontakt, mit dem ersten Blechende. Dadurch ist verhindert, dass nach einem Schweißvorgang Flüssigkeiten bzw. Verunreinigungen in einen zwischen den Blechenden gebildeten Spalt gelangen, die den nachfolgenden Emailvorgang beeinträchtigen können.In a further embodiment of the invention may be formed on the front side of the overlapped inside sheet metal end a sealing lip which extends along the end face. The sealing lip is in pressure contact, preferably in line contact, with the first end of the sheet. This prevents liquids or impurities from getting into a gap formed between the plate ends after a welding operation, which can impair the subsequent enamel process.

In einer bevorzugten Ausgestaltung der Erfindung kann die Schweißnaht als eine Punktschweißnaht ausgebildet sein. Durch ein Punktschweißen ist ein übermäßiger Wärmeeintrag in die Blechenden verhindert. Thermisch bedingte Verformungen der Blechenden beim Schweißen sind somit vermieden. Von Vorteil ist es dabei, wenn die Schweißpunkte über einen Teilungsabstand von 5-7 mm beabstandet sind. Dadurch ist einerseits ein ausreichend geringer Wärmeeintrag gewährleistet; andererseits sind die Blechenden ausreichend dicht miteinander verschweißt.In a preferred embodiment of the invention, the weld may be formed as a spot weld. Spot welding prevents excessive heat input into the sheet ends. Thermally induced deformations of the sheet ends during welding are thus avoided. It is advantageous if the welds are spaced over a pitch of 5-7 mm. As a result, on the one hand a sufficiently low heat input is ensured; On the other hand, the sheet metal ends are sufficiently tightly welded together.

In einem besonders bevorzugten Verfahren zur Herstellung der Muffel für das Gargerät kann die Keilfläche durch eine kostengünstige Kaltverformung des garraumseitigen Randbereiches des überlappten Blechendes hergestellt werden.In a particularly preferred method for producing the muffle for the cooking appliance, the wedge surface can be produced by a cost-effective cold deformation of the garraumseitigen edge region of the overlapped sheet metal end.

Die Kaltverformung kann besonders effektiv durch ein Rollenwalzverfahren ausgeführt werden. Dabei sind die erfindungsgemäß angewendeten Blechdicken zwischen 0,4 und 0,8 mm, insbesondere 0,5 mm, vorteilhaft. Ein Blechende mit derartiger Bleckdicke ist einerseits kostengünstig. Andererseits wird bei dieser Blechdicke eine übermäßige Materialverdrängung während einer Kaltverformung vermieden. Durch Materialverdrängung verursachte Verformungen im Blechende können damit verhindert werden. Eine angestrebte Keilgeometrie ist folglich wesentlich einfacher auszubilden als bei Blechdicken, die größer als 0,8mm sind.The cold working can be carried out particularly effectively by a roll rolling method. In this case, the sheet thicknesses used according to the invention between 0.4 and 0.8 mm, in particular 0.5 mm, are advantageous. A sheet metal end with such Bleckdicke is on the one hand cost. On the other hand, with this sheet thickness, excessive material displacement during cold working is avoided. By Material displacement caused deformation in the sheet metal end can be prevented. A desired wedge geometry is therefore much easier to form than with sheet thicknesses greater than 0.8 mm.

In den beigefügten Figuren sind vier Ausführungsbeispiele der Erfindung beschrieben. Es zeigen:

Figur 1
eine perspektivische Ansicht eines Ausschnitts aus einer Muffel für ein Gargerät in einem Teilschnitt gemäß dem ersten Ausführungsbeispiel;
Figur 2
eine der Figur 1 entsprechende Ansicht der Muffel ohne Emailschicht;
Figur 3
eine schematische Seitenschnittansicht zweier verschweißter Blechenden gemäß dem zweiten Ausführungsbeispiel;
Figur 4
eine schematische Seitenschnittansicht zweier verschweißter Blechenden gemäß dem dritten Ausführungsbeispiel;
Figur 5
eine schematische Seitenschnittansicht zweier verschweißter Blechenden gemäß dem vierten Ausführungsbeispiel; und
Figur 6
ein vereinfachtes Blockdiagramm, das ein Herstellungsverfahren der Muffel skizziert.
In the accompanying figures, four embodiments of the invention are described. Show it:
FIG. 1
a perspective view of a section of a muffle for a cooking appliance in a partial section according to the first embodiment;
FIG. 2
a view corresponding to Figure 1 of the muffle without enamel layer;
FIG. 3
a schematic side sectional view of two welded sheet metal ends according to the second embodiment;
FIG. 4
a schematic side sectional view of two welded sheet metal ends according to the third embodiment;
FIG. 5
a schematic side sectional view of two welded sheet metal ends according to the fourth embodiment; and
FIG. 6
a simplified block diagram outlining a manufacturing process of the muffle.

In der Figur 1 ist ein vergrößerter Ausschnitt einer Muffel 1 für einen Backofen gezeigt. Die Muffel 1 grenzt einen Garraum 3 ein und weist ein erstes Blechende 7 sowie ein zweites Blechende 5 auf. Die Blechdicke s des Muffelblechs beträgt 0,5 mm. Zur Verbindung der beiden Blechenden 5, 7 überlappt das innenseitige erste Blechende 7 das außenseitige zweite Blechende 5. Wie aus der Figur 1 hervorgeht, liegt dabei das innenseitige Blechende 7 plan auf dem ersten Blechende 5. Die beiden Blechenden 5 und 7 sind mittels einer durch das Bezugszeichen 13 angedeuteten Punktschweißnaht miteinander verbunden. Die dabei entstehenden Schweißlinsen sind in einem Randabstand a1 von etwa 4 mm von einer vertikalen Stirnseite 15 des ersten Blechendes 7 angeordnet. Gemäß der Figur 1 ist die Blechdicke s an der vertikalen Stirnseite 15 auf etwa 0,18 mm reduziert. Das innenseitige erste Blechende 7 ist dabei in Richtung auf seine stirnseitige Blechkante 14 keilförmig abgeflacht. Eine Keilfläche 17 ist dabei als eine ebene Schrägfläche ausgebildet, die mit der Innenseite 19 des Muffelblechs eine erste Kantenlinie S1 bildet. In gleicher Weise wird zwischen der vertikalen Stirnseite 15 des zweiten Blechendes 7 und der Keilfläche 17 eine zweite Kantenlinie S2 gebildet. Beide Kantenlinie S1 und S2 spannen eine Keilebene ER auf. Diese Keilebene ER schließt gemäß der Figur 1 einen Steigungswinkel α von ca. 20° mit der Muffelinnenseite 19 ein. Bevorzugt sind die Übergänge im Bereich der Kantenlinien S1 und S2 abgerundet.FIG. 1 shows an enlarged detail of a muffle 1 for an oven. The muffle 1 defines a cooking chamber 3 and has a first end of the sheet 7 and a second end of the sheet 5. The sheet thickness s of the muffle sheet is 0.5 mm. To connect the two sheet metal ends 5, 7, the inside first sheet end 7 overlaps the outside second sheet end 5. As is apparent from Figure 1, while the inside sheet end 7 is flat on the first sheet end 5. The two sheet ends 5 and 7 are by means of a the reference numeral 13 indicated spot weld joined together. The resulting welding lenses are arranged at an edge distance a 1 of about 4 mm from a vertical end face 15 of the first sheet end 7. According to FIG. 1, the sheet thickness s on the vertical end face 15 is reduced to approximately 0.18 mm. The inside first sheet end 7 is flattened wedge-shaped in the direction of its end-side sheet edge 14. A wedge surface 17 is formed as a flat inclined surface, with the inner side 19 of the muffle plate a first Edge line S 1 forms. In the same way, a second edge line S 2 is formed between the vertical end face 15 of the second sheet end 7 and the wedge surface 17. Both edge line S 1 and S 2 span a wedging plane ER. According to FIG. 1, this wedging plane ER includes a pitch angle α of approximately 20 ° with the muffle inner side 19. The transitions in the region of the edge lines S 1 and S 2 are preferably rounded.

Die Breite a2 des keilförmig abgeflachten Blechendes 7 ist kleiner gehalten als der Randabstand a1 der Schweißnaht 11. Damit sind die Schweißlinsen 13 der Schweißnaht nicht im Bereich der Keilfläche 17 vorgesehen. Eine Beeinträchtigung der Keilgeometrie durch die Schweißnaht 13 ist somit vermieden. Die Schweißlinsen der Schweißnaht 13 sind über einen Teilungsabstand e von ca. 6 mm beabstandet. Dies ermöglicht einerseits eine ausreichende Dichtigkeit zwischen dem ersten und zweiten Blechende. Andererseits ist die Wärmebeaufschlagung der Blechenden 5 und 7 während des Schweißvorgangs - im Vergleich zu einer durchgängig ausgebildeten Schweißnaht, wie es beim Quetschnahtschweißen notwendig ist - ausreichend gering.The width a 2 of the wedge-shaped flattened sheet end 7 is kept smaller than the edge distance a 1 of the weld seam 11. Thus, the welding lenses 13 of the weld are not provided in the region of the wedge surface 17. An impairment of the wedge geometry by the weld 13 is thus avoided. The welding lenses of the weld 13 are spaced over a pitch e of about 6 mm. On the one hand, this allows sufficient tightness between the first and second sheet metal end. On the other hand, the heat load of the sheet metal ends 5 and 7 during the welding process - compared to a consistently formed weld, as is necessary in Quetschnahtschweißen - sufficiently low.

Die Blechenden 5 und 7 der Muffel 1 sind gemäß der Figur 1 mit einer Emailschicht 21 überzogen, deren mittlere Schichtdicke bei ca. 150 µm liegt. Aufgrund der abgeflachten Keilfläche 17 weist die Emailschicht 21 eine rissfreie Oberfläche im Bereich zwischen dem ersten und zweiten Blechende 5, 7 auf. Die Oberfläche der Emailschicht 21 verläuft daher glatt über die Stirnseite 13 des ersten Blechendens 5 hinweg, ohne nachteilhafte Zehrkanten zu bilden.The sheet ends 5 and 7 of the muffle 1 are coated according to the figure 1 with an enamel layer 21, whose average layer thickness is about 150 microns. Due to the flattened wedge surface 17, the enamel layer 21 has a crack-free surface in the region between the first and second plate ends 5, 7. The surface of the enamel layer 21 therefore extends smoothly over the end face 13 of the first sheet metal end 5, without forming disadvantageous Zehrkanten.

In der Figur 3 ist in einer schematischen Seitenschnittansicht ein zweites Ausführungsbeispiel gezeigt. Daraus geht hervor, dass die mit gestrichelter Linie angedeutete Keilebene ER - wie im ersten Ausführungsbeispiel - einen Keilwinkel α von ca. 20° einschließt. Im Unterschied zum ersten Ausführungsbeispiel ist die Keilfläche 17 ausgebaucht gebildet und ragt aus der Keilebene ER. Die Blechdicke s liegt in diesem Ausführungsbeispiel an der Stirnseite 15 bei 0 mm; d.h. das erste Blechende 7 verläuft in einem spitzen Winkel auf seine Stirnseite 15 zu. Der Übergang zwischen den Blechenden ist dadurch noch stärker geglättet.FIG. 3 shows a second exemplary embodiment in a schematic side sectional view. It follows that the wedging plane E R indicated by the dashed line-as in the first embodiment-includes a wedge angle α of approximately 20 °. In contrast to the first embodiment, the wedge surface 17 is formed bulged and protrudes from the wedging plane ER. The sheet thickness s is in this embodiment at the end face 15 at 0 mm; ie the first end of the sheet 7 extends at an acute angle to its end face 15. The transition between the sheet metal ends is thereby even more smooth.

In der Figur 4 ist ein drittes Ausführungsbeispiel dargestellt, in dem an der vertikalen Stirnseite 15 des zweiten Blechendens 7 eine Dichtlippe 23 ausgebildet ist. Die Dichtlippe 23 ist an der dem ersten Blechende 5 zugewandten Unterseite des zweiten Blechendes 7 geformt. Wie gezeigt, ist die Dichtlippe 23 in einem Linienkontakt mit dem ersten Blechende 5 gedrückt. Dadurch ist ein Spalt 10 zwischen dem ersten und zweiten Blechende 5, 7 verschlossen. Flüssigkeiten bzw. Verunreinigungen können daher nach dem Schweißvorgang nicht in den Spalt 10 eindringen und den folgenden Emailliervorgang beeinträchtigen.FIG. 4 shows a third exemplary embodiment in which a sealing lip 23 is formed on the vertical end face 15 of the second sheet metal end 7. The sealing lip 23 is formed at the first sheet end 5 facing bottom of the second sheet end 7. As shown, the sealing lip 23 is pressed in line contact with the first sheet end 5. As a result, a gap 10 between the first and second plate end 5, 7 is closed. Liquids or impurities can therefore not penetrate into the gap 10 after the welding process and affect the subsequent enamelling process.

Ein viertes Ausführungsbeispiel ist in der Figur 5 in einer schematischen Seitenansicht skizziert. Hier ist für einen besonders glatten Übergang zwischen den Blechenden 5, 7 das keilförmig abgeflachte Blechende 7 nach Art einer Wendepunktlinie zur stirnseitigen Blechkante 14 gekrümmt.A fourth exemplary embodiment is sketched in FIG. 5 in a schematic side view. Here, for a particularly smooth transition between the sheet metal ends 5, 7, the wedge-shaped flattened plate end 7 in the manner of a turning point line to the end-side sheet edge 14 is curved.

In dem Blockdiagramm gemäß der Figur 6 ist das grundsätzliche Verfahren zur Herstellung der Muffel 1 angegeben. Demzufolge werden in einem ersten Verfahrensschritt 25 die Blechenden 5 und 7 maßgenau vertikal geschnitten. Anschließend wird in einem Verformungsschritt 27 das zweite Blechende 7 kaltverformt, wodurch die Keilfläche 17 ausgebildet wird. Aufgrund der verwendeten Blechstärke s von o,5mm wird vorteilhafterweise beim Kaltverformen nur eine geringfügige Materialverdrängung im Blechende 7 verursacht. Unerwünschte Verformungen im Bereich des Blechendes 7, die durch die Materialverdrängung hervorgerufen werden, sind daher weitgehend vermieden. Der Übergang zwischen den Blechenden 5 und 7 ist somit nicht durch Materialverdrängungen beeinträchtigt.In the block diagram according to FIG. 6, the basic method for producing the muffle 1 is indicated. Consequently, in a first method step 25, the sheet ends 5 and 7 cut dimensionally vertical. Subsequently, in a deformation step 27, the second sheet end 7 is cold-worked, whereby the wedge surface 17 is formed. Due to the sheet thickness s of o, 5 mm used, only a slight material displacement in the sheet end 7 is advantageously caused during cold forming. Unwanted deformations in the region of the sheet end 7, which are caused by the material displacement, are therefore largely avoided. The transition between the sheet ends 5 and 7 is thus not affected by material displacement.

In einem darauffolgenden Schweißschritt 29 werden die Blechenden 5, 7 durch ein Schweißverfahren miteinander verbunden. Anwendung finden beliebige Schweißverfahren, beispielsweise ein Punkt-, ein Rollpunkt-, ein Rollnaht- oder ein Laserschweißverfahren. Als besonders vorteilhaft hat sich das Punktschweißverfahren erwiesen. In diesem Schweißverfahren ist die zugeführte Wärmemenge vergleichsweise gering. Wärmebedingte Verformungen der Blechenden 5, 7 können dadurch vermieden werden. In einem folgenden Arbeitsschritt 31 werden die Blechenden 5, 7 einem Emaillierverfahren unterworfen, in dem die Blechenden 5, 7 mit einer Emailschicht 21 einer Schichtdicke vom 80 bis 120 µm überzogen werden. Die Emailschicht erfüllt den Zweck, die Blechenden vor Korrosion zu schützen. Vorteilhafterweise ist die Emailschicht möglichst dünn ausgelegt, um Spannungsrisse beispielsweise in einem Pyrolysebetrieb zu verhindern.In a subsequent welding step 29, the sheet metal ends 5, 7 are joined together by a welding process. Use find any welding methods, such as a point, a roll point, a seam seam or a laser welding process. The spot welding process has proved to be particularly advantageous. In this welding process, the amount of heat supplied is comparatively low. Heat-induced deformations of the sheet ends 5, 7 can be avoided. In a subsequent operation 31, the sheet ends 5, 7 subjected to an enamelling process in which the sheet ends 5, 7 are coated with an enamel layer 21 of a layer thickness of 80 to 120 microns. The enamel layer serves the purpose of protecting the sheet metal ends from corrosion. Advantageously, the enamel layer as thin as possible to prevent stress cracks, for example, in a pyrolysis operation.

Claims (16)

  1. Cooking appliance muffle, the inner side (19) is coated with an enamel layer (21), in which muffle (1) at least two metal plate ends (5, 7) are connected together by means of a weld seam (13), of which metal plate ends (5, 7) a first metal plate end (7) at the inner side overlaps a second metal plate end (5) at the outer side, which first metal plate end (7) forms by its metal plate edge (14) at the end face a step-like transition between the metal plate parts (5, 7), characterised in that the first metal plate end (7) at the inner side is flattened in wedge shape in direction towards its metal plate edge (14) at the end face prior to the welding.
  2. Cooking appliance according to claim 1, characterised in that the first metal plate end (7) is flattened in wedge shape at the inner side.
  3. Cooking appliance according to claim 1 or 2, characterised in that an edge height (h) of the metal plate edge (14) of the first metal plate end (7) lies between 0 and 0.2 mm.
  4. Cooking appliance according to one of the preceding claims, characterised in that an end face (15) of the first metal plate end (7) extends vertically with respect to the muffle inner side (19).
  5. Cooking appliance according to one of the preceding claims, characterised in that a slope angle (α) of the first metal plate end (7) flattened in wedge shape lies between 10 and 35°, particularly at 20°.
  6. Cooking appliance according to claim 5, characterised in that the metal plate end (7) flattened in wedge shape is bulged outwardly towards the muffle inner side (19).
  7. Cooking appliance according to claim 5, characterised in that the second metal plate end (7) flattened in wedge shape is curved in the manner of a reversal point (9) with respect to the metal plate edge (14) at the end face.
  8. Cooking appliance according to one of the preceding claims, characterised in that the metal plate thickness (s) of the muffle metal plate is between 0.4 and 0.8 mm, preferably 0.5 mm.
  9. Cooking appliance according to one of the preceding claims, characterised in that the weld seam (13) extends parallel to the metal plate edge (14) and the edge spacing (a1) thereof from the metal plate edge (14) is between 3 and 6 mm.
  10. Cooking appliance according to claim 9, characterised in that the weld seam (13) is formed by weld spots, the pitch spacing (e) of which is between 5 and 7 mm.
  11. Cooking appliance according to one of claim 9 and 10, characterised in that the edge spacing (a1) of the weld seam (11) is larger than a width (a2) of the first metal plate end (7) flattened in wedge shape.
  12. Cooking appliance according to one of the preceding claims, characterised in that a sealing lip (23) extending along the end face (15) is formed at the end face (15) of the first metal plate end (7) and that the sealing lip (23) is pressed into contact with the first metal plate end (7).
  13. Method of producing a cooking appliance muffle (1) by a welding step (29), in which at least two metal plate ends (5, 7) are arranged to overlap one another and are welded together, of which metal plate ends (5, 7) a first metal plate (7) at the inner side overlaps a second metal plate end (7) at the outer side, which first metal plate end (7) forms by its metal plate edge (14) at the end face a step-like transition on an inner side (19) of the muffle between the metal plate parts (5, 7) and with an enamelling step (31) in which the muffle inner side (19) is enamelled, characterised in that prior to the welding step (29) a deforming step (27) is carried out in which the metal plate end (7) at the inner side is flattened in wedge shape in the direction of its metal plate edge (14) at the end face.
  14. Method according to claim 13, characterised in that prior to the deforming step (27) a cutting step (25) is carried out in which the second metal plate end (7) is cut vertically.
  15. Method according to claim 13 or 14, characterised in that in the deforming step (25) the metal plate end (7) flattened in the wedge shape is formed by a roller rolling method.
  16. Method according to one of claims 12 to 14, characterised in that the metal plate thickness (s) of the muffle plate is between 0.4 and 0.8 mm, preferably 0.5 mm, for the deforming step.
EP02781337A 2001-12-21 2002-11-28 Cooking device muffle and a method for the production of a cooking device muffle Expired - Lifetime EP1459013B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10163183A DE10163183A1 (en) 2001-12-21 2001-12-21 Cooking device muffle and method for producing a cooking device muffle
DE10163183 2001-12-21
PCT/EP2002/013460 WO2003054449A1 (en) 2001-12-21 2002-11-28 Cooking device muffle and a method for the production of a cooking device muffle

Publications (2)

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EP1459013A1 EP1459013A1 (en) 2004-09-22
EP1459013B1 true EP1459013B1 (en) 2006-09-27

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EP02781337A Expired - Lifetime EP1459013B1 (en) 2001-12-21 2002-11-28 Cooking device muffle and a method for the production of a cooking device muffle

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US (1) US20040255928A1 (en)
EP (1) EP1459013B1 (en)
AT (1) ATE340970T1 (en)
DE (2) DE10163183A1 (en)
ES (1) ES2271343T3 (en)
WO (1) WO2003054449A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2436986A1 (en) 2010-09-30 2012-04-04 Electrolux Home Products Corporation N.V. Oven muffle with welding connection
WO2023110248A1 (en) * 2021-12-13 2023-06-22 BSH Hausgeräte GmbH Cooking appliance having a muffle with walls of different thicknesses

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE102013205750A1 (en) * 2013-04-02 2014-10-16 BSH Bosch und Siemens Hausgeräte GmbH Enamelling a cooking appliance part
ES2526619B1 (en) * 2013-07-09 2015-10-26 Bsh Electrodomésticos España, S.A. Domestic cooking appliance
EP2840321A1 (en) * 2013-08-19 2015-02-25 Electrolux Appliances Aktiebolag Oven muffle for a domestic oven
AU2015387419A1 (en) * 2015-03-20 2017-08-10 Electrolux Appliances Aktiebolag Oven muffle for a domestic oven
EP3338937A1 (en) 2016-12-20 2018-06-27 Electrolux Appliances Aktiebolag Method for manufacturing a domestic appliance
JP7027122B2 (en) * 2017-10-27 2022-03-01 シロキ工業株式会社 How to seam weld vehicle door sashes
EP4216670A1 (en) * 2022-01-21 2023-07-26 Electrolux Appliances Aktiebolag Method of manufacturing a multi-component part of a household and/or cooking appliance

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US2466859A (en) * 1949-04-12 Oven liner
US2912751A (en) * 1954-04-26 1959-11-17 Frederick W Turnbull Method of enameling the interior of hollow metal bodies
US3410544A (en) * 1966-10-03 1968-11-12 Btu Eng Corp Furnace muffle
US3580733A (en) * 1969-04-17 1971-05-25 Scm Corp Food cooking apparatus having continuous cleaning properties and process for producing same
US3615082A (en) * 1969-09-02 1971-10-26 Btu Eng Corp Furnace muffle
GB8617773D0 (en) * 1986-07-21 1986-08-28 Thorn Emi Appliances Cooking apparatus
FR2714959A1 (en) * 1994-01-12 1995-07-13 Scholtes Ets Eugen Domestic cooking oven.
DE19813786C2 (en) * 1998-03-27 2000-04-27 Bsh Bosch Siemens Hausgeraete Oven with one-piece oven muffle
DE10104501B4 (en) * 2001-01-31 2004-06-24 BSH Bosch und Siemens Hausgeräte GmbH Cooking appliance
KR100754758B1 (en) * 2001-08-08 2007-09-04 피트블라도 리차드 비. Sheet glass forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2436986A1 (en) 2010-09-30 2012-04-04 Electrolux Home Products Corporation N.V. Oven muffle with welding connection
WO2012041713A1 (en) 2010-09-30 2012-04-05 Electrolux Home Products Corporation N. V. Oven muffle with welding connection
WO2023110248A1 (en) * 2021-12-13 2023-06-22 BSH Hausgeräte GmbH Cooking appliance having a muffle with walls of different thicknesses

Also Published As

Publication number Publication date
ATE340970T1 (en) 2006-10-15
ES2271343T3 (en) 2007-04-16
US20040255928A1 (en) 2004-12-23
WO2003054449A1 (en) 2003-07-03
DE10163183A1 (en) 2003-07-03
EP1459013A1 (en) 2004-09-22
DE50208289D1 (en) 2006-11-09

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