EP2840321A1 - Ofenmuffel für Haushaltsofen - Google Patents

Ofenmuffel für Haushaltsofen Download PDF

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Publication number
EP2840321A1
EP2840321A1 EP13180819.8A EP13180819A EP2840321A1 EP 2840321 A1 EP2840321 A1 EP 2840321A1 EP 13180819 A EP13180819 A EP 13180819A EP 2840321 A1 EP2840321 A1 EP 2840321A1
Authority
EP
European Patent Office
Prior art keywords
welding
muffle
enamel layer
oven
energized sections
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Withdrawn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
EP13180819.8A
Other languages
English (en)
French (fr)
Inventor
Marco Böckler
Christian Ehninger
Helmut Hahn
Michael Schock
Richard Wiesinger
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.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP13180819.8A priority Critical patent/EP2840321A1/de
Publication of EP2840321A1 publication Critical patent/EP2840321A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • F24C15/005—Coatings for ovens

Definitions

  • the present invention relates to a oven muffle for a domestic oven.
  • Known cooking ovens comprise oven muffles made of metal sheets which are welded together.
  • the muffles usually comprise an enamel coating for hygienic purposes and for protection against corrosive destruction. Due to the progress in the field of laser technology, besides other established welding technologies, laser welding systems are increasingly used for the generation of the necessary welding connections of the oven muffle.
  • the enamel coating of a conventional oven muffle comprises at least a first or basic layer and at least one second layer of enamel which are applied to the oven muffle and fired.
  • the second layer can comprise a catalytic enamel which can be a porous enamel to catalyze the reduction of soils in the self-cleaning process.
  • an oven muffle being made of at least two muffle parts which are fixedly connected to each other by a welding connection, wherein said welding connection comprises at least one welding seam that has elongated high energized sections alternating with low energized sections.
  • High energized sections shall be understood as sections or regions of the welding seam that have received a relatively high overall energy or high energy density in the welding process in comparison to the low energized sections which are sections of the welding seam that have received lower overall energy or lower energy density than the high energized sections.
  • the high energized sections may alternate regularly with the low energized sections but also a not regular alternation is possible.
  • said muffle parts are in contact with each other within an overlapping section and said welding connection is arranged within said overlapping section.
  • the inventive solution can be advantageously applied to an overlapping section.
  • the welding seam can be arranged along the complete overlapping section, thus, providing a stable and fix welding connection.
  • said welding seam is produced in a laser welding process.
  • Alternating high energized sections and low energized sections can be produced advantageously in a laser welding process.
  • said low energized sections are enlongated low energized sections, in particular in that the low energized sections are substantially as long as said high energized sections. In such an arrangement the stability of the welding connection is improved.
  • said low energized sections are welded, in particular in a laser welding process, by receiving a substantially lower energy density than the high energized sections, in particular wherein material in the low energized sections is softened and/or melted.
  • said low energized sections receive no energy in the welding process, in particular such that no material is melted in the in the low energized sections in the welding process.
  • sections of the welding connection are advantageously minimally influenced with a heat load.
  • said high energized sections have a regular length from 5 mm to 150 mm and/or that the low energized sections have a regular length of from 0,5 mm to 8 mm.
  • a welding seam with sections according to said dimensions has a particularly high rigidity and is therefore preferred.
  • said oven muffle has an enamel coating which comprises at least one first enamel layer, in particular a basic enamel layer, and at least one second enamel layer, in particular a catalytic enamel layer.
  • a first layer of a basic enamel is applied to the muffle in order to cover the muffle's welding areas. Subsequently, the basic enamel is melted at a high temperature, e.g. at 800°C.
  • a second layer of a catalytic enamel is applied onto the first layer of enamel.
  • the catalytic enamel is heated again to about the same temperature to form the catalytic enamel layer.
  • the object of the invention is also achieved by a method for manufacturing an oven muffle comprising at least one step of welding at least two muffle parts to form an oven muffle, wherein a welding tool applies energy to an overlapping section of said muffle parts in such way, that high energized sections and low energized sections are formed alternately in said overlapping section by alternating the energy output of said welding tool and/or alternating the motion speed of said welding tool and/or alternating the distance between welding tool and overlapping section.
  • an oven muffle is created that can be advantageously enameled in the region of a welding connection.
  • High energized sections and low energized sections can be precisely formed by varying process parameters regularly or not regularly.
  • the applicant has observed that defects are generated in the enamel process in the region of the welding connection.
  • the defects seem to result from the appearance of bubbles on the enamel surface as a result of the enamel process. It was surprisingly observed by the applicant, that said defects are reduced in the region of the welding connections, when the welding connections which have to be enameled are formed according to the invention.
  • the first layer and/or the second layer emit gas which generates bubbles within the finished enamel coating. It is assumed, that the effect of the bubble generation is dependent on the welding process and the fire steps of the enamel process.
  • the emission of gas can be reduced by the specific welding step, resulting in a reduction of bubbles in or on the final enamel surface.
  • top part 2 and wrapper part 3 comprise edge sections which overlap each other, forming an overlapping section 5.
  • a welding seam extends from a rear section to a front section of the oven muffle 1.
  • the welding seam 6 is formed as a discontinuous welding seam. This means that in the welding process in which the welding seam 6 is produced, the energy of the welding tool is varied or alternated. Due to this variation or alternation of the welding energy, the welding seam 6 comprises high energized sections 7 and low energized sections 8.
  • the oven muffle 1 is shown from the exterior, however, the appearance of the welding seam 6 is equal on the interior side.
  • the welding process in this case is a laser welding process.
  • the welding process can be carried out be guiding the laser beam along the overlapping section 5 with a predetermined motion speed, wherein the laser is operated in a pulsed mode.
  • one high energized section 7 is generated and during the pause between two pulses one low energized section 8 is generated.
  • the oven muffle 1 is coated with enamel in an enamel process.
  • the coating may consist of at least two layers, including a basic layer and at least one second layer applied on the basic layer.
  • at least one second enamel layer may be a catalytic enamel, e.g. offered under the trade name PE PERC CL Black 2C2C XE3211BA by the company FERRO FRANCE.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
EP13180819.8A 2013-08-19 2013-08-19 Ofenmuffel für Haushaltsofen Withdrawn EP2840321A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13180819.8A EP2840321A1 (de) 2013-08-19 2013-08-19 Ofenmuffel für Haushaltsofen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13180819.8A EP2840321A1 (de) 2013-08-19 2013-08-19 Ofenmuffel für Haushaltsofen

Publications (1)

Publication Number Publication Date
EP2840321A1 true EP2840321A1 (de) 2015-02-25

Family

ID=49000834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13180819.8A Withdrawn EP2840321A1 (de) 2013-08-19 2013-08-19 Ofenmuffel für Haushaltsofen

Country Status (1)

Country Link
EP (1) EP2840321A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3327358A1 (de) * 2016-11-25 2018-05-30 Electrolux Appliances Aktiebolag Hohlraum mit einer emailbeschichtung, kochgerät mit solch einem hohlraum und verfahren zur herstellung solch eines hohlraums
EP3338937A1 (de) * 2016-12-20 2018-06-27 Electrolux Appliances Aktiebolag Verfahren zur herstellung eines haushaltsgeräts

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254500A1 (de) * 1986-07-21 1988-01-27 Aktiebolaget Electrolux Kochgeräte
US20040255928A1 (en) * 2001-12-21 2004-12-23 Bsh Bosch Und Siemens Hausgerate Gmbh Muffle for a cooking device and method for producing the muffle
DE102008053771A1 (de) * 2008-10-22 2010-04-29 E.G.O. Elektro-Gerätebau GmbH Auskleidung für einen Backofen und Backofen
EP2196735A2 (de) * 2008-12-12 2010-06-16 BSH Bosch und Siemens Hausgeräte GmbH Muffel für ein Gargerät
EP2436986A1 (de) * 2010-09-30 2012-04-04 Electrolux Home Products Corporation N.V. Ofenmuffel mit Schweißverbindung
EP2460613A1 (de) * 2009-07-31 2012-06-06 Neturen Co., Ltd. Geschweisstes bauelement und schweissverfahren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254500A1 (de) * 1986-07-21 1988-01-27 Aktiebolaget Electrolux Kochgeräte
US20040255928A1 (en) * 2001-12-21 2004-12-23 Bsh Bosch Und Siemens Hausgerate Gmbh Muffle for a cooking device and method for producing the muffle
DE102008053771A1 (de) * 2008-10-22 2010-04-29 E.G.O. Elektro-Gerätebau GmbH Auskleidung für einen Backofen und Backofen
EP2196735A2 (de) * 2008-12-12 2010-06-16 BSH Bosch und Siemens Hausgeräte GmbH Muffel für ein Gargerät
EP2460613A1 (de) * 2009-07-31 2012-06-06 Neturen Co., Ltd. Geschweisstes bauelement und schweissverfahren
EP2436986A1 (de) * 2010-09-30 2012-04-04 Electrolux Home Products Corporation N.V. Ofenmuffel mit Schweißverbindung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3327358A1 (de) * 2016-11-25 2018-05-30 Electrolux Appliances Aktiebolag Hohlraum mit einer emailbeschichtung, kochgerät mit solch einem hohlraum und verfahren zur herstellung solch eines hohlraums
WO2018095661A1 (en) * 2016-11-25 2018-05-31 Electrolux Appliances Aktiebolag A cavity having an enamel coating, a cooking appliance comprising such a cavity and a method for manufacturing such a cavity
EP3338937A1 (de) * 2016-12-20 2018-06-27 Electrolux Appliances Aktiebolag Verfahren zur herstellung eines haushaltsgeräts
WO2018114290A1 (en) * 2016-12-20 2018-06-28 Electrolux Appliances Aktiebolag Method for manufacturing a domestic appliance
CN110087819A (zh) * 2016-12-20 2019-08-02 伊莱克斯家用电器股份公司 用于制造家用电器的方法
US11618102B2 (en) 2016-12-20 2023-04-04 Electrolux Appliances Aktiebolag Method for manufacturing a domestic appliance
AU2017381050B2 (en) * 2016-12-20 2023-07-27 Electrolux Appliances Aktiebolag Method for manufacturing a domestic appliance
CN110087819B (zh) * 2016-12-20 2023-11-21 伊莱克斯家用电器股份公司 用于制造家用电器的方法

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