EP3129171B1 - Procédé de fabrication d'un fond de tambour pour le tambour de lavage d'un appareil électroménager, tambour de lavage et appareil électroménager - Google Patents

Procédé de fabrication d'un fond de tambour pour le tambour de lavage d'un appareil électroménager, tambour de lavage et appareil électroménager Download PDF

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Publication number
EP3129171B1
EP3129171B1 EP15712878.6A EP15712878A EP3129171B1 EP 3129171 B1 EP3129171 B1 EP 3129171B1 EP 15712878 A EP15712878 A EP 15712878A EP 3129171 B1 EP3129171 B1 EP 3129171B1
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EP
European Patent Office
Prior art keywords
sheet metal
drum
metal element
cylinder
laundry
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.)
Active
Application number
EP15712878.6A
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German (de)
English (en)
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EP3129171A1 (fr
Inventor
Holger LÖFFLER
Vladimir Baecker
Uwe Ratfisch
Thorsten Walter
Ahmet Kocak
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Priority to PL15712878T priority Critical patent/PL3129171T3/pl
Publication of EP3129171A1 publication Critical patent/EP3129171A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/263—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements assembled from at least two elements connected to each other; Connecting or sealing means therefor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs

Definitions

  • the invention relates to a method for producing a component of a laundry drum of a household appliance from a sheet metal element which is formed into a hollow cylinder-like body, is connected to two opposite sides of the sheet metal element and is deformed, according to the preamble of claim 1.
  • the invention also relates to a drum base produced by this method, a laundry drum with such a drum base and a household appliance with such a laundry drum.
  • Household appliances for the care of laundry items such as washing machines, clothes dryers and washing (full) dryer, each containing a rotatably mounted in the household appliance laundry drum, in which the laundry items can be added.
  • An exemplary construction of a laundry drum is in Fig. 1 illustrated.
  • the laundry drum generally designated 1 usually consists of three interconnected components, namely a circular cylindrical drum shell 2, a drum rear wall 3 and a so-called drum top 4.
  • the drum shell 2 is connected with its axial end faces on the one hand to the drum bottom 4 and on the other hand to the drum rear wall 3 , The connection is usually realized by means of a crimping of the respective elements.
  • the drum end 4 often serves as a running surface for bearing rollers 5, which are rotatably mounted on a bearing plate 6.
  • a front wall 7 of a housing is shown.
  • Fig. 2 shows a section of the laundry drum 1 in a perspective view.
  • the respective connection points 8, 9 can be seen, which are realized by a curling of the drum shell 2 with the drum bottom 4 on the one hand and the drum rear wall 3 on the other.
  • the laundry drum 1 is usually designed both in terms of load and cost-efficient, which is achieved by a sheet thickness variation in the different components 2, 3, 4.
  • the forehead bottom 4 for reasons of stability is made of a sheet metal element of thickness 0.6 mm
  • the drum shell 2 and the drum rear wall 3 can be formed from a sheet of lesser thickness, namely, for example, 0.4 mm or 0.5 mm.
  • drum end base 4 the production of the drum end base 4, wherein the production is also applicable to a drum rear wall 3.
  • the drum end floor and the drum rear wall can also be referred to hereinafter only as drum base.
  • the drum bottom 4 and / or the drum rear wall 3 is produced in tumble dryers, washing machines and dryers by a three-stage forming process with subsequent crimping of the edge.
  • circular blanks are used.
  • Such a circular sheet metal element 10, from which the drum top 4 is made, is in Fig. 3 shown schematically.
  • This circular sheet metal element 10 is according to Fig. 4 subjected to a first deep-drawing process.
  • the deep-drawn sheet metal element 10 is subjected to a separation process in which a circular central region of the sheet metal element 10 is punched out. This creates a passage opening through which the items of laundry can be introduced into the drum 1.
  • the sheet metal element 10 after this separation process is in Fig. 5 shown schematically.
  • a second deep drawing of the sheet metal element 10 takes place, so that a drum end floor 4 is provided, as it is in Fig. 6 is shown.
  • a major disadvantage of the existing process chain is also the production-related introduction of the highest degrees of deformation and residual stresses in the area of the flange 8, 9 (see. Fig. 2 ).
  • relatively high demands are made on robustness the crimping process with regard to the resulting flare geometry, which has a crucial importance for the life of the drum end floor.
  • precisely this region which is heavily loaded from the production process by the crimp, serves as running surface for the front drum bearings or the rollers 5 (cf. Fig. 1 ) and thus has a supporting function. Due to the high loads from the forming process in the production of the laundry drum, the risk of premature failure in the operation of the household appliance is relatively large, which reduces the life of the entire household appliance.
  • a method for producing a drum shell of a laundry drum of a washing machine known.
  • a hollow cylindrical shell is rounded from a sheet metal blank and welded to its abutting edges.
  • This hollow cylinder is reshaped in a further step by means of an expansion process, for example, to introduce bevels at the two edges of the drum shell.
  • a disadvantage of this method is that the material can not be reshaped so far as to form the same complete drum bottom.
  • this known method is used only for the production of the drum shell and in a further step, a separate drum base must continue to be manufactured and connected to the drum shell. This is done, for example, as already described above.
  • the component should be produced with as little waste.
  • the degrees of deformation and thus the formation of high residual stresses should be reduced.
  • An inventive method is used to produce a component for a laundry drum of a household appliance from a sheet metal element.
  • a hollow cylinder of similar body in particular a hollow cylinder and preferably a hollow circular cylinder, is used as the sheet metal element and the component forms a drum base.
  • the drum bottom can be either a drum top or a drum back wall or both.
  • Essential for the invention is that for the production of the drum base, a hollow cylinder similar body is used, which is formed by the connection of two opposite sides of the sheet metal element.
  • a body similar to a hollow cylinder is understood to mean a body whose sectional surfaces are circular or elliptical with the sectional planes running perpendicular to its central cylinder axis, wherein the shape and size of the cut surfaces along the cylinder axis may be different.
  • the hollow cylinder-like body can therefore not only have a purely circular cylindrical surface but also a frustoconical surface.
  • the drum base is produced by forming the sheet metal element or the hollow cylinder-like body. It is first produced from a flat sheet metal element by connecting two opposite sides of the hollow cylinder similar body, which is then formed in at least one further step to the drum base. Alternatively, a corresponding deformation, in particular by means of a so-called roll forming, can take place already during the molding of the hollow cylinder-like body, wherein the already formed sheet metal element is then connected in a further step on two opposite sides. It can then be performed after joining another forming step to achieve even higher Umformtrade. If after the bonding no further forming step is to take place, the sheet metal strip is formed before connecting the narrow sides in the shape of the drum base, being prepared by the step of connecting the narrow sides of the preformed sheet metal element ready drum bottom.
  • the hollow cylinder similar body is also referred to only as a hollow cylinder.
  • the invention makes use of the way of using a hollow cylinder as the starting geometry for the production process of the drum base.
  • a hollow cylinder ensures that the material waste can be minimized to a minimum, even zero, thereby enabling a cost-efficient production of the drum base. Namely, it does not need to be stamped out areas of the sheet metal element, so that in principle the material provided - especially stainless steel, such as 1.4016 or 1.4510 - can be fully utilized.
  • the induced by the proposed manufacturing process loads in the field of flanging are namely significantly lower compared to the prior art, whereby a reduction in the risk of premature failure of the frontal floor can be achieved.
  • the forehead bottom is very often used as a running surface for the rollers (cf. Fig. 1 ), and it should be ensured for this reason that the front floor can withstand greater forces in the operation of the household appliance. In the case of the method according to the invention, this is made possible by the fact that, in the manufacture of the forehead bottom, this overall significantly lower load is applied in the area of the flange than is the case in the prior art.
  • An FE process analysis (finite element method) has shown that the degree of deformation can be minimized, in particular in the area of the crimp with the drum shell.
  • An FLC (Forming Limit Curve) analysis based on the FE results obtained has also shown that the process robustness in the method according to the invention is markedly improved compared to the conventional production method.
  • the drum base is preferably a drum end floor (see Fig. 4 in Fig. 1 ).
  • the drum back wall (3 in Fig. 1 ) using a hollow cylinder, although the drum rear wall has an opening in a central area. This would be the case, for example, if the drum rear wall substantially corresponds to the drum end wall and thus also has a central opening.
  • the central opening of the drum rear wall could be closed by a fixed part of the housing of the household appliance.
  • both the drum top floor and the drum rear wall could each have a running surface for the rollers for rotatably supporting the drum.
  • the production of the drum base also includes the production of the hollow cylinder itself.
  • the hollow cylinder is made from a sheet metal strip.
  • a sheet metal strip whose width is 100 mm and whose length is 1575 mm can be used.
  • the thickness of the sheet used can be 0.6 mm.
  • the material waste can be further reduced if the sheet metal strip is separated directly from a sheet metal coil by means of a production-related separation process.
  • the preparation of the hollow cylinder can therefore be made without waste directly from the coil.
  • the production of the hollow cylinder preferably provides that the sheet metal strip is rolled round and / or bent.
  • the hollow cylinder can thus be produced by round rollers and / or by bending the metal strip.
  • the production of the hollow cylinder can thus be made without much effort and automated.
  • two opposite narrow sides of the metal strip are connected in particular by welding material fit together.
  • a suitable welding method a technology analysis was carried out in this respect, in which the basic applicability of plasma welding, in particular micro-plasma welding, and laser welding was demonstrated both on the previously used material and on alternative materials.
  • the two narrow sides of the metal strip can thus be connected to one another in an advantageous manner by means of a laser welding device and / or a plasma welding device.
  • the production can thus be automated; On the other hand, this also the required stability and robustness of the hollow cylinder is achieved.
  • the hollow cylinder thus produced can then already form the bottom of the drum or be formed into the bottom of the drum:
  • the reshaping of the hollow cylinder may initially involve that, in order to produce a funnel shape of the sheet metal element, an axial cylinder section of the hollow cylinder is widened radially outward. In this way, the required funnel shape of the drum base can be produced without much manufacturing effort.
  • the funnel shape of the sheet metal element may be produced by already deforming the sheet metal strip into the funnel shape during rolling or bending, and subsequently joining the thus formed sheet metal strip to two opposing sides. These sides to be joined are preferably bevelled beforehand to avoid uneven material overhang.
  • the particular advantage of this alternative is that only very small deformations of the sheet metal strip are required for the production of the funnel shape, whereby the process robustness for the production of the drum base can be significantly increased.
  • a funnel shape has proved advantageous when an angle of 45 ° to 55 °, in particular an angle of 50 °, is generated between a lateral surface of this cylinder section on the one hand and the cylinder axis on the other hand, in particular by widening of the cylinder section.
  • This angular range represents a good compromise between the required shape of the sheet metal element on the one hand and the deformation degrees caused in the process on the other hand. It has been found that at an angle in the range of 45 ° to 55 ° no critical degrees of deformation are caused and the required process robustness not being affected.
  • the expansion of the cylinder portion is performed in at least two stages. In this way, the material is much less burdened compared to a single-stage expansion, which proves to be particularly particularly in terms of the life of the laundry drum to be particularly advantageous. On the other hand, a larger angle when expanding the cylinder portion can thus be achieved overall.
  • the cylinder portion is expanded by a larger angle than a second stage flaring operation.
  • This embodiment makes use of the fact that the load of the material increases at a larger angle and thus in the first stage Overall, a larger angle can be achieved without significantly affecting the stability of the material.
  • the first and optionally second expansion step can be omitted.
  • the forming of the sheet metal element may further include deep drawing of the sheet metal element.
  • This deep-drawing process is preferably carried out after production of the funnel shape of the sheet metal element, in particular after the widening of the cylinder section, so that the deep drawing is subjected to the already expanded or funnel-shaped sheet metal element.
  • This method differs from that DE 100 21 456 A1 known method also characterized in that no expansion process is required for the production of the drum base.
  • the special distribution is that during deep drawing compared to the expansion process higher cycle times for the production of the drum base can be achieved.
  • the invention may also include a method which is used for producing a laundry drum for a domestic appliance, wherein the laundry drum is produced from a drum base produced by a method according to the invention, which is connected to a cylindrical drum shell, in particular by means of crimping is connected.
  • the invention also relates to a drum base produced by the method according to the invention and a laundry drum for a domestic appliance for the care of laundry items, with a cylindrical drum shell which is connected at at least one of its axial end faces with such drum base.
  • the laundry drum can also at both its axial (front) sides after Having drum base produced by the process according to the invention. This is particularly advantageous if the drum rear wall corresponds in shape to the end wall.
  • the rear wall of the drum also has an opening corresponding to the passage opening of the end wall, which may be closed by a fixed housing part of the household appliance.
  • An inventive household appliance for the care of laundry comprises a laundry drum according to the invention.
  • the household appliance may be a tumble dryer, a washing machine or a washer-dryer.
  • laundry drum and the domestic appliance according to the invention may comprise the device features disclosed by the method according to the invention or directly derived therefrom.
  • Fig. 10 shows a flowchart of a manufacturing method according to a first embodiment of the invention.
  • a drum top 4 is made as in Fig. 1 is shown.
  • the method begins in a first step S1, in which a metal strip is separated from a sheet metal coil or a strip material, for example by means of laser cutting or the like.
  • the provided metal strip may have, for example dimensions of 100 x 1575 mm.
  • As a band material the material 1.4016 or 1.4510 can be used, in general terms, stainless steel is used.
  • the sheet thickness can be 0.6 mm.
  • the metal strip is preferably a rectangular element.
  • the metal strip now designated 11 is rolled round, so that the shape of a straight hollow circular cylinder is produced.
  • the hollow cylinder is produced by opposite narrow sides 12, 13 of the sheet metal strip 11 are welded together.
  • a laser welding device or a plasma welding machine is used.
  • Fig. 7 is an axial cylinder portion 14 of the in Fig. 7 Flared with 15 designated hollow cylinder radially outwardly widened.
  • the hollow cylinder 15 represents a sheet metal element 16, which is the basis of the production of the drum end base 4.
  • the sheet metal element 16 as shown in FIG Fig. 8 shown subjected to a deep drawing process.
  • the final shape of the drum end floor 4 is generated, as in Fig. 9 is shown.
  • By deep drawing can optionally a tread for the bearing rollers 5 (see. Fig. 1 ) be created.
  • the FIG. 11 shows a second embodiment of the invention.
  • step S1 of the first embodiment is executed.
  • step S2 the metal strip 11 is guided in the feed direction 26 or 26 'between two shaping rollers.
  • the metal strip 11 is rolled round as in step S2 and additionally at the same time formed into a funnel shape, so that an at least partially conical hollow cylinder is produced.
  • the two forming rollers 22 and 25 form a first forming stage and rotate in opposite directions about the axes of rotation 22.1 and 25.1. The with directions of rotation of the forming rollers 22 and 25 are shown by the arrows 22.2 and 25.2.
  • FIG. 11 illustrated embodiment has a second and possibly further forming stages, not shown.
  • the second forming stage again consists of two counter-rotating forming rollers 23, 24, which further reshape the metal strip 11 located between the forming rollers.
  • the first, second and further forming stage are arranged on a circular path. In this way, the hollow cylinder similar body 15 can be particularly easily formed, which already has a funnel shape or even a shape corresponding to the drum bottom cross-section has.
  • step S3 in which the already formed sheet metal strip 11 is connected to each other with its narrow sides.
  • the sheet metal element 16 produced in step S3 may already form the drum end 4 or it is analogous to the first embodiment, the step S4 carried out to produce by further forming the final shape of the drum top 4.
  • the material waste can be minimized, and a cost-efficient production of the drum end floor 4 can be made possible.
  • Another advantage is the increase in process robustness and the reduction in the stress induced by the manufacturing process in the region of the flange 8 (cf. Fig. 2 ), whereby a reduction in the risk of premature failure of the drum end floor 4 can be achieved.
  • FE process analysis was performed on this manufacturing process, and the results showed that the degrees of deformation in the area of the flange 8 of the drum end floor 4 are minimized.
  • the degree of deformation is represented by the change in shape ⁇ , which is defined as the integral of h 0 to h 1 over (dh / h 0 ), where h is a length in a defined direction, h 0 is a length of the component before forming, h 1 is the Length after deformation and that is the differential change in length.
  • the result of an FLC analysis based on the FE analysis is in Fig. 12 for two orthogonal directions ⁇ 1 and ⁇ 2 , showing the shape change ⁇ of a pattern at a selected area in comparison of two forming processes.
  • 19 designates the determined change in shape ⁇ of the FLC analysis for the method according to the invention and 20 for the method according to the prior art.
  • a failure limit is designated 21. How out Fig. 12 As can be seen, the distance to the failure limit in the inventive method is significantly greater than in the conventional manufacturing process. This shows that the process robustness in the proposed method is significantly better than in the conventional process chain.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (14)

  1. Procédé de fabrication d'un composant d'un tambour à linge (1) d'un appareil électroménager à partir d'un élément en tôle (16), lequel se présente sous la forme d'un corps (15) de type cylindre creux, en particulier sous la forme d'un cylindre creux, est assemblé sur deux côtés opposés (12, 13) de l'élément en tôle (16) et est déformé, ledit corps (15) étant réalisé à partir d'une bande de tôle (11) et deux petits côtés opposés (12, 13) de ladite bande de tôle (11) étant assemblés pour former le corps (15) de type cylindre creux, caractérisé en ce que le composant est un fond de tambour (4) du tambour à linge (1), ledit fond de tambour (4) étant réalisé par déformation du corps (15) et l'étape d'assemblage des petits côtés (12, 13) étant effectuée avant une étape de déformation du corps (15) de type cylindre creux pour obtenir le fond de tambour (4) ou après une étape de déformation de la bande de tôle (11) pour obtenir la forme du fond de tambour (4).
  2. Procédé selon la revendication 1, caractérisé en ce que la bande de tôle (11) est séparée d'une bobine de tôle au moyen d'un procédé de séparation.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que le corps (15) est réalisé par cintrage et/ou par pliage et/ou par roulage de la bande de tôle (11).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que lors de la réalisation du corps (15), les deux petits côtés opposés (12, 13) de la bande de tôle (11) sont assemblés par liaison de matière par soudage, en particulier au moyen d'un appareil de soudage au laser et/ou d'un appareil de soudage au plasma.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le corps (15), respectivement l'élément en tôle (16), est en forme d'entonnoir.
  6. Procédé selon la revendication 5, caractérisé en ce que la déformation du corps (15) comprend une étape dans laquelle, pour obtenir la forme d'entonnoir de l'élément en tôle (16), une partie cylindrique (14) du corps (15) est évasée radialement vers l'extérieur.
  7. Procédé selon la revendication 5 ou 6, caractérisé en ce qu'un angle de 45 à 55°, en particulier un angle de 50°, est formé entre une surface d'enveloppe (17) de ladite partie cylindrique (14) d'une part et l'axe de cylindre (18) d'autre part.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que l'évasement de la partie cylindrique (14) est effectué en au moins deux étapes.
  9. Procédé selon la revendication 8, caractérisé en ce que lors d'une opération d'évasement d'une première étape, la partie cylindrique (14) est évasée selon un plus grand angle que lors d'une opération d'évasement d'une deuxième étape.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que dans la première étape, un angle de 35 à 45°, en particulier un angle de 40°, est formé entre une surface d'enveloppe (17) de la partie cylindrique (14) et l'axe de cylindre (18).
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que la déformation comprend un emboutissage de l'élément en tôle (16), notamment de l'élément en tôle (16) déjà évasé.
  12. Fond de tambour pour un tambour à linge d'un appareil ménager pour l'entretien de pièces de linge, le fond de tambour étant fabriqué à partir d'un élément en tôle (16), lequel se présente sous la forme d'un corps (15), est assemblé sur deux côtés opposés (12, 13) de l'élément en tôle (16) et est déformé, ledit corps (15) étant réalisé à partir d'une bande de tôle (11) et deux petits côtés opposés (12, 13) de ladite bande de tôle (11) étant assemblés pour former le corps (15) de type cylindre creux, ledit fond de tambour (4) étant fabriqué suivant un procédé selon l'une des revendications précédentes.
  13. Tambour à linge (1) d'un appareil ménager pour l'entretien de pièces de linge, comprenant une enveloppe de tambour cylindrique (2), laquelle est assemblée à au moins l'une de ses faces frontales axiales avec un fond de tambour (4) selon la revendication 12.
  14. Appareil ménager pour l'entretien de pièces de linge, comprenant un tambour à linge (1) selon la revendication 13.
EP15712878.6A 2014-04-07 2015-03-25 Procédé de fabrication d'un fond de tambour pour le tambour de lavage d'un appareil électroménager, tambour de lavage et appareil électroménager Active EP3129171B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15712878T PL3129171T3 (pl) 2014-04-07 2015-03-25 Sposób wytwarzania dna bębna do bębna pralniczego urządzenia gospodarstwa domowego, bęben pralniczy i urządzenie gospodarstwa domowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014206637.9A DE102014206637A1 (de) 2014-04-07 2014-04-07 Verfahren zum Herstellen eines Trommelbodens für eine Wäschetrommel eines Haushaltsgeräts, Wäschetrommel und Haushaltsgerät
PCT/EP2015/056411 WO2015155008A1 (fr) 2014-04-07 2015-03-25 Procédé de fabrication d'un fond de tambour pour le tambour de lavage d'un appareil électroménager, tambour de lavage et appareil électroménager

Publications (2)

Publication Number Publication Date
EP3129171A1 EP3129171A1 (fr) 2017-02-15
EP3129171B1 true EP3129171B1 (fr) 2018-02-28

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EP (1) EP3129171B1 (fr)
CN (1) CN106460289B (fr)
DE (1) DE102014206637A1 (fr)
ES (1) ES2665352T3 (fr)
PL (1) PL3129171T3 (fr)
WO (1) WO2015155008A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102019109627A1 (de) * 2019-04-11 2020-10-15 Mühlhoff Umformtechnik GmbH Verfahren zur Umformung eines dünnwandigen zylindrischen Rohlings
DE102019205461A1 (de) * 2019-04-16 2020-10-22 BSH Hausgeräte GmbH Verfahren zum Herstellen eines Hohlzylinder ähnlicher Körpers einer Trommel eines Haushaltsgeräts sowie für ein Haushaltsgerät
WO2023219470A1 (fr) * 2022-05-12 2023-11-16 엘지전자 주식회사 Procédé de fabrication d'un tambour et appareil de traitement du linge comprenant un tambour

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WO2015155008A1 (fr) 2015-10-15
DE102014206637A1 (de) 2015-10-08
ES2665352T3 (es) 2018-04-25
PL3129171T3 (pl) 2018-07-31
CN106460289B (zh) 2019-01-15
CN106460289A (zh) 2017-02-22
EP3129171A1 (fr) 2017-02-15

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