Method for manufacturing a laundry drum and laundry drum

Abstract

The present invention relates to a method for manufacturing a casing wall (1) for a laundry drum (29), particularly for a laundry drum (29) for a household appliance (27) used for caring for laundry, the method comprising the steps of: providing a metal sheet; forming the metal sheet into a hollow cylinder (2) thereby forming the basic shape of the casing wall (1) of the laundry drum (29); producing at least one coherent molded structure (13, 14) in the casing wall (1), wherein for this purpose a plurality of molded elements (15) are produced relative to each other in a tightly spaced manner; and producing overflow holes (21) in the molded elements (15) in a position-defined manner.

Description

Technical Field

[0001] One aspect of the present invention relates to a method for manufacturing a laundry drum for a household appliance used for caring for laundry. Another aspect of the present invention relates to a laundry drum for a household appliance used for caring for laundry. Yet another aspect of the present invention relates to a household appliance used for caring for laundry. Background Technology

[0002] Household appliances used for laundry care (such as washing machines or washer-dryers) have a laundry drum. This laundry drum typically has a hollow cylindrical mantle.

[0003] Furthermore, the washing drum typically also has a bottom plate (Bodenscheibe) on the back side. This causes the hollow cylindrical casing wall to close rearward. On the front side, the washing drum typically has a so-called end face bottom (Stirnboden). The end face bottom and the bottom plate are usually separate from the casing wall and connected to it. In this case, it is known that a folded joint (Falzverbindungen) is formed between the aforementioned components.

[0004] To provide a suitable receiving volume for laundry, it is also known that the casing wall has radially outwardly oriented bulges. For example, a drum casing is known from EP 1 872 881 A2, in which a molded structure with multiple individual molded elements is formed. However, the molded elements are constructed relatively spaced apart from each other, thus limiting the number of molded elements. The arrangement here is that the already cylindrically bent drum casing is held in a fixed position during the molding process.

[0005] Furthermore, it is known that such casing walls have a large region that extends radially. This region is radially further outward than the edge strips on the end sides of the roller casing. Such casing walls are known, for example, from WO 2011 / 064201 A1. Multiple orifices are constructed in the radially extended region of the roller casing.

[0006] Furthermore, a laundry drum with a drum housing is known from KR 10 2020 0105071 A. In this case, a large, radially outwardly projecting molded area is constructed within the drum housing. Multiple orifices are formed within these molded areas.

[0007] Furthermore, problems may arise when creating overflow holes in a casing wall for a laundry drum, where a molded structure is formed with multiple molded elements arranged close together but relatively spaced apart. Due to tolerances (especially those already mentioned), the precise positioning of these overflow holes within these molded elements has so far been relatively imprecise. These overflow holes can only be constructed with a correspondingly wide mesh in the molded structure. If the molded elements are constructed more closely together, relatively large deviations in the position of these overflow holes may occur. This results in a degradation of the geometry of these overflow holes. These deviations are also more visually noticeable because they are identified in their positional relationship to the molded structure. Furthermore, undesirable burrs may appear on the edges of these overflow holes when they are cut open using a cutting tool. This occurs especially when the overflow holes are cut before the molding process.

[0008] Therefore, the conventional approach involves cutting an overflow hole in a still-flat plate of the casing wall and then introducing a molded structure, subsequently creating a hollow cylinder based on the casing wall. The flat plate is then later rolled into a hollow cylinder. In this case, cutting the overflow hole before producing the molded elements is only possible when the number of these molded elements is very small and they are relatively far apart. It is precisely when, in a further production method, the overflow hole is first cut in a flat plate, then the plate is shaped into a hollow cylinder and the mating edges are welded accordingly, and then the molded structure is introduced into the casing wall immediately afterward, that undesirable positional deviations related to the molded elements and the overflow hole may occur.

[0009] This could also lead to undesirable situations regarding the removal of lye from the washing machine drum.

[0010] Another disadvantage may arise when overflow holes are cut into a flat plate, shaping the plate into a hollow cylinder, and creating radially extended regions in the casing wall before forming the molded structure. That is, structural cracks may appear in the region of the cut edges of the overflow holes. This is also undesirable. Furthermore, these overflow holes change their roundness and become elliptical in the direction of the main material flow during forming (or expansion). This increases the potential range of sharp cut edges. Summary of the Invention

[0011] The objective of this invention is to provide a method, a housing wall for a laundry drum, and such a laundry drum, wherein the positional accuracy between the molded elements of the molded structure and the overflow hole is improved.

[0012] One aspect of the present invention relates to a method for manufacturing a casing wall for a laundry drum (especially a laundry drum for a household appliance for laundry care), comprising the following steps:

[0013] - Metal sheets are available;

[0014] - The metal sheet is shaped into a hollow cylinder, thus forming the basic shape of the casing wall of the laundry drum;

[0015] - At least one coherent molded structure is formed in the housing wall, wherein a plurality of molded elements are formed relative to each other in a tightly packed manner;

[0016] - Overflow holes are created on the molded element according to their positions.

[0017] This method achieves the following: first, a hollow cylinder is formed, thus forming the basic geometry of the casing wall of the washing drum. Following the formation of the hollow cylinder, not only is a molding structure created within it, but overflow holes are also formed. It is precisely in this tightly packed configuration of the related orifices of the molding elements that this processing method significantly improves the positional accuracy between the molding elements and the overflow holes. This avoids, on the one hand, undesirable deformation of the overflow holes, and on the other hand, the misalignment of the molding elements and the overflow holes (as is the case in conventional methods). This achieves, on the one hand, very precise generation of the overflow holes, and on the other hand, a molding element with tightly packed orifices relative to each other. Especially when (as explained in the manufacturing method) these overflow holes are to be formed on the molding element itself and the orifices are tightly packed, the proposed method can significantly improve positional accuracy. In particular, this also avoids the distorted geometry of the overflow holes (as occurs when they are formed in a flat plate and then the hollow cylinder shape is subsequently formed, as is the case in the prior art). Similarly, in this case, the resulting overflow holes can be avoided. These molded elements are produced in a tightly packed manner, which in particular means that these molded elements are directly adjacent to each other. A portion of the boundary profile of one molded element is also a portion of the boundary profile of another adjacent molded element. This is the case when there are multiple molded elements, thus defining the tightness of the orifice.

[0018] In one embodiment, the potential definition of the overflow hole and the molding element is achieved by creating the overflow hole at a reference location of the molding element. Therefore, these previously known and desired reference locations imply a reference point at which at least one overflow hole should be created.

[0019] Therefore, the location-specific generation also means that there is a pre-defined relationship between the molded element portion (or reference portion) and the overflow hole.

[0020] In one embodiment, at least some molding elements are formed directly adjacent to each other. The boundary profile of one molding element is also the boundary profile of another molding element. At least one overflow hole is formed on this boundary profile. The overflow hole is formed in the region of the boundary profile. This is another advantageous embodiment. Because the tightly poreped molding structure also forms a groove system for the discharge of lye in the detergent drum on the inner side of the hollow cylinder. Therefore, this is also tightly poreped and constituted by correspondingly formed and directly adjacent molding elements. Thus, very defined drainage grooves can be formed. By constructing the overflow holes precisely on these corresponding boundary profiles, the lye in the drainage grooves formed by the boundary profiles can be directly and specifically guided to the overflow hole. This improves the discharge of lye.

[0021] Furthermore, this type of tightly pore-filled molding structure enables an improved design for guiding laundry within the laundry drum. This results in the placement of laundry within the laundry drum with minimal contact.

[0022] In one embodiment, a boundary profile with a free edge is generated, which defines two adjacent molding elements and makes them independent of each other. Therefore, the free edge is the end of the boundary profile. This free edge is also the connecting edge between the two adjacent molding elements. In particular, here, the boundary profiles of adjacent molding elements thus directly and jointly lead to this single edge. At least one overflow hole is formed in this edge. The overflow hole is formed entirely within the plane of the edge.

[0023] This is especially relevant to the structure of the orifices in the molded element, which is in a very prominent position for the overflow holes. This further enhances the advantages mentioned above.

[0024] It is the prior creation of the hollow cylinder that gives rise to the basic geometry of the casing wall, which enables the overflow holes to be positioned very accurately in these very conspicuous locations (i.e., on these edge edges) in the very close arrangement of the holes in the molding element.

[0025] In one embodiment, the molding element is molded into a domed (or protruding) element. The associated arch is oriented towards the longitudinal axis of the wash drum. This forms a quasi-concave shape in the arched wall of the molding element. Thus, the boundary wall of the molding element is formed as a dome. Consequently, the molding element inlet is located on the outer side of the housing wall, constituting an entrance to the hollow region of the molding element. This inlet is defined by a boundary profile. This boundary profile is the edge of the boundary wall. This boundary profile is particularly formed by edge edges. Therefore, a portion of the boundary profile of one molding element transitions to a portion of the boundary profile of another molding element directly adjacent to it. Thus, this transition portion of these boundary profiles is also an edge edge. This edge edge therefore also signifies a relatively narrow bridging (steg) of such boundary profiles of the molding element. Therefore, this edge edge is a narrow, continuous planar strip.

[0026] These edge edges are therefore also line elements (or thin strip elements).

[0027] The molded element is specifically constructed as a cavity. This cavity opens outwards, particularly through an inlet.

[0028] In one embodiment, the boundary profile of a molded element can be configured in a teardrop shape. Thus, the associated geometry widens on both sides from one end and then converges towards each other at the other end.

[0029] In particular, the molded structure with molded elements is produced as a honeycomb pattern (or honeycomb structure). This means that these molded elements are arranged in a honeycomb pattern, staggered relative to each other.

[0030] In one embodiment, a molding element is formed having a first end when viewed in the circumferential direction around the longitudinal axis of the hollow cylinder. This first end forms a first boundary profile node (or edge node). In particular, multiple boundary profiles (or multiple partial regions of the boundary profiles of the molding element) terminate at this first boundary profile node (or edge node). At least one overflow hole (especially just two overflow holes) is formed at this first boundary profile node (especially the first edge node). Additionally or alternatively, a second end of the molding element is formed, offset azimuthally from the first end. A second boundary profile node (especially a second edge node) is formed at this second end. In particular, multiple boundary profiles (especially multiple partial sections of the boundary profiles of multiple adjacent molding elements) terminate at this second node. At least one overflow hole is formed at this second boundary profile node (especially the second edge node). In particular, exactly two overflow holes are formed at this node.

[0031] A boundary profile is composed of (especially wavy) profile segments. These profile segments are the various parts of the profile.

[0032] By using the geometry of the molding elements mentioned above (especially the shape of the boundary profile of these molding elements at the inlet of the molding elements), specific drainage channels and corresponding orientations are formed on the opposite side (i.e., the inner side of the casing wall). Since these drainage channels then meet (or merge) at these first and second ends, the creation of at least one overflow hole at the corresponding node is particularly advantageous. This is especially advantageous in terms of both guiding the alkali solution and, on the other hand, in terms of discharging the alkali solution from the washing drum via the overflow hole.

[0033] The method explained above is particularly advantageous in that the overflow holes can be accurately positioned and generated even in these very conspicuous locations on the molded element.

[0034] In one embodiment, a molded element (in particular all molded elements) is produced as an inwardly arched dome relative to the longitudinal axis of a hollow cylinder. The boundary surface (or boundary wall) of the dome is shaped to be spherically bulging, and the boundary edges (or boundary profiles) are produced to taper sharply at opposite ends in azimuth angles. This is already an advantageous geometry for these molded elements, as explained above.

[0035] In one embodiment, a plurality of such molded elements are formed in the housing wall as a honeycomb structure. Specifically, a first arrangement of molded elements oriented axially is formed at the same azimuth position in the azimuth direction. This first arrangement overlaps the first arrangement of molded elements with half a molded element in the azimuth direction relative to a second arrangement of molded elements also oriented axially (which is also formed at the same azimuth position). These molded elements of the second arrangement overlap the first arrangement of molded elements with half a molded element in the axial direction. This, in particular, creates an advantageous honeycomb structure. This achieves a very close packing of the molded elements and a particularly tight arrangement of the pores. In mass production, it is preferable that each of three molded regions (or molded structures) is produced synchronously (i.e., simultaneously). It is also possible to produce these molded regions sequentially.

[0036] In one embodiment, overflow holes in the boundary edges and each arranged molding element are generated simultaneously by an overflow hole generating unit. This enables a particularly high degree of symmetry and rapid generation of the overflow holes.

[0037] In one embodiment, overflow holes are formed at the azimuthally opposite ends of the boundary edges of each arranged molding element. This also allows for the creation of configurations in which these overflow holes are precisely positioned at both ends of each arranged molding element. This results in particularly straight axial lines for the corresponding overflow holes at these ends.

[0038] In one embodiment, after an overflow hole is formed in a first axial position in a row of molded elements, the hollow cylinder is offset axially by a stroke equivalent to half the axial height of the molded element. Then, overflow holes are formed at opposite ends of the boundary edges of the row of molded elements, wherein the row is arranged axially offset relative to the already perforated row by half a molded element. This also simultaneously achieves the rapid, yet very precise, generation of multiple overflow holes, especially for overflow holes in axially arranged molded elements.

[0039] In one embodiment, three separate, tightly perforated molded structures are formed on the casing wall. These molded structures are arranged (or formed) at equal intervals relative to each other in the circumferential direction surrounding the longitudinal axis of the hollow cylinder.

[0040] A carrying part is constructed in the intermediate region between these molded structures in the casing wall.

[0041] In one embodiment, after the hollow cylinder is formed, an extended molding portion is formed in the casing wall. This defined extended molding portion constitutes an extended region that bulges outward in the radial direction. This extended region is formed as a circumferential and outwardly arched annular ridge. This annular ridge is constructed to completely surround the longitudinal axis. In this respect, the annular ridge is also constructed without interruption around the longitudinal axis. In this extended molding portion (or in this extended region, which is very large compared to the molding elements of the molding structure), at least one separate molding structure having multiple molding elements is formed. Generally, these molding elements have the same shape and the same dimensions in one embodiment.

[0042] In one embodiment, a bottom wall (or bottom plate) is mounted on a hollow cylinder. The bottom wall is a separate component of the detergent drum from the housing wall. The bottom wall causes the detergent drum to close at the axial end of the hollow cylinder.

[0043] In one embodiment, an end face bottom is mounted on the hollow cylinder. The end face bottom is a separate component relative to the hollow cylinder. In particular, the connection between the end face bottom and the hollow cylinder is formed by a flanging process and then by a folded connection. Correspondingly, it can also be provided between the hollow cylinder and the bottom plate.

[0044] In one embodiment, these overflow holes are generated as round holes.

[0045] In this method, in an advantageous embodiment, as explained above, a plurality of overflow holes are thus sequentially generated. Specifically, the overflow holes are sequentially cut into the hollow cylinder of the casing wall. It can be configured that more than 50, particularly more than 100, particularly more than 200, and particularly more than 250 overflow holes are generated for each molding structure. If the casing wall thus has, for example, two separate molding structures or three separate molding structures, then each of these molding structures also has that number of overflow holes. It can be configured that these overflow holes are generated simultaneously in their respective sections. These overflow holes can be cut from the inside out. These overflow holes can be sequentially cut in time intervals of less than 25 seconds, particularly between 50 and 20 seconds or between 5 and 20 seconds. In one embodiment, there is a cutting unit of the production equipment consisting of, for example, 20 cutting punches. Thus, 20 overflow holes can be cut simultaneously. This can be done accordingly for each molding structure. Therefore, the cutting unit can simultaneously cut two vertical (especially 10 overflow holes each) hole arrangement in each cutting process. This has already been explained above.

[0046] In a further operation, after each cut, the housing wall can first be rotated, for example, clockwise by a predetermined amount, so as to then cut the adjacent overflow hole arrangements. If, for example, the molded structure has coherent molded elements with closely spaced holes, the housing wall can be further rotated seven times at a corresponding pitch after each cutting process (in particular, cutting two parallel arrangements with 10 overflow holes each), thereby cutting the exemplary number of axial arrangements with an odd number of molded structures.

[0047] Specifically, after cutting the eighth overflow hole arrangement, the casing wall is excavated vertically at a pitch (Teilung). Here, this pitch is also half the dimension of a molding element. Here, this relates to half the axial height of a molding element. Thus, in relation to cutting all the overflow holes in these arrangements of the molding structure, the same sequence is performed in the counterclockwise direction, and the cutting unit operates accordingly.

[0048] Therefore, this method enables the precise positioning of these overflow holes on the narrow bridging portions of the tightly packed molded structure. These narrow bridging portions, in particular, produce the edge edges already described above, which are formed as continuous narrow faces (or narrow planar strips).

[0049] It is also possible to produce overflow holes with very stable shapes (especially circular ones). Overflow holes with significantly reduced burrs can be formed because these overflow holes are no longer introduced before the forming process and thus before the hollow cylinder is formed, and therefore will not deform or tear structurally due to the forming of such a hollow cylinder. In addition, lower cutting forces and therefore cheaper equipment technology are valued.

[0050] Another aspect of the invention relates to a housing wall, and more particularly to a laundry drum for a household appliance used for caring for laundry. The housing wall (especially the laundry drum) can be obtained, in particular, by means of methods according to the aspects mentioned above or advantageous embodiments.

[0051] In one embodiment, the laundry drum has a tightly packed molded structure. This means that these molded structures have a plurality of individual molded elements that are directly adjacent to each other. In particular, in this case, the boundary profiles of the entrances of such arched configurations of one molded element communicate with each other. The free edges of these boundary profiles lead to linear edge edges (or edge strips), and the free edges of the adjacent boundary profiles of another molded element also terminate in said linear edge edges (or edge strips).

[0052] The overflow holes of the washing machine drum are constructed on these edge edges. These overflow holes are specifically formed entirely within these edge edges. In particular, these overflow holes are arranged at the azimuthally opposite ends of the boundary profile of the molding element. This ensures the precise positioning of these overflow holes at these specific locations on the molding element. This achieves a stable position of these overflow holes relative to the molding structure. This results in a shape-stable configuration for these overflow holes. These overflow holes are circular, avoiding elliptical overflow holes. The cut edges of these overflow holes are constructed to be free of surface cracks, reducing or eliminating burr formation. The direction and implementation of the cut edges are smoother or more glossy until the edge breaks.

[0053] The terms “up,” “down,” “front,” “back,” “horizontal,” “vertical,” “depth,” “width,” and “height” indicate the given position and orientation when using and positioning the casing wall, washing drum, or household appliance as specified.

[0054] Another feature of the invention is derived from the claims, drawings, and description of the drawings. The features and combinations of features mentioned above in the specification, as well as those subsequently mentioned in the description of the drawings and / or shown separately in the drawings, can be used not only in the combinations specified but also in other combinations or individually, without departing from the framework of the invention. Therefore, such embodiments of the invention can also be considered included and disclosed: embodiments not explicitly shown and explained in the drawings, but which are known and can be produced by individual combinations of features from the explained embodiments. Such embodiments and combinations of features can also be considered disclosed: embodiments and combinations of features therefore do not possess all the features of the initially stated independent claims. Attached Figure Description

[0055] The embodiments of the invention will now be explained in more detail with reference to the illustrative drawings. The accompanying drawings show:

[0056] Figure 1 A perspective view showing an embodiment of a housing wall for a laundry drum according to the present invention;

[0057] Figure 2 A side view showing an embodiment of the casing wall for a laundry drum according to the present invention; and

[0058] Figure 3 A front view of an embodiment of a household appliance for laundry care according to the invention, having an embodiment of a laundry drum according to the invention, is shown. Detailed Implementation

[0059] exist Figure 1The diagram illustrates, schematically and in perspective, an embodiment of the casing wall 1 of a laundry drum for a household appliance used for laundry care. The drum casing or casing wall 1 has a longitudinal axis A. The casing wall 1 is integrally constructed (particularly of metal, especially stainless steel). The casing wall 1 is configured as a hollow cylinder 2. The casing wall 1 has an extended region 3 that bulges outward radially, perpendicular to the longitudinal axis A. The extended region 3 is constructed to completely surround the longitudinal axis A without interruption. Thus, the extended region 3 is, to a certain extent, a surrounding bulge. In this embodiment, the extended region 3 is constructed spaced apart from the first hollow cylindrical edge 4 of the casing wall 1. In particular, the extended region 3 is also constructed spaced apart from the second hollow cylindrical edge 5. This means that the extended region 3 terminates shortened or retracted in these hollow cylindrical walls 4 and 5, which are opposite each other at their ends. For this purpose, the extended region 3 has a first circumferential edge 6. Furthermore, the extended region 3 has a second circumferential edge 7. These two edges 6 and 7 are constructed in a circumferential direction around the longitudinal axis A. Viewed axially, the first edge 6 is constructed spaced apart from the first hollow cylindrical edge 4. Similarly, the second edge 7 is constructed spaced apart from the second hollow cylindrical edge 5. As can be seen, an edge strip 8 of the casing wall 1 is formed between the first hollow cylindrical edge 4 and the first edge 6. The radius of this edge strip 8 is smaller than the radius of the extended region 3. The edge strip 8 is axially bounded by the edge 6 and the hollow cylindrical edge 4.

[0060] In one embodiment, another edge strip 9 is constructed between the second edge 7 and the second hollow cylinder edge 5. This other edge strip 9 has a smaller radius than the extended region 3. This other edge strip 9 is axially bounded by the edge 7 and the hollow cylinder edge 5.

[0061] The edge strip 8 is constructed as a single layer here (or at any point in the manufacturing process of the entire washing drum). The other edge strip 9 is also constructed as a single layer here.

[0062] The extended region 3 has a tapered section 10. The tapered section 10 terminates directly on the first edge 6. The tapered section 10 transitions outward from the first edge 6 into a tapered shape so as to transition into the hollow cylindrical section 11 of the extended region 3. Correspondingly, another tapered region 12 is also constructed on the axially opposite side. This other tapered region 12 terminates on the second edge 7 on one hand and on the hollow cylindrical section 11 on the other hand.

[0063] The edge strip 8 is constructed in a ring shape. The other edge strip 9 is constructed in a ring shape.

[0064] Furthermore, the housing wall 1 has a molding structure 13. In this embodiment, another molding structure 14 is also constructed. Furthermore, in this embodiment, the housing wall 1 is provided with [the following details are missing here:] Figure 1 The third molding structure is not visible in the diagram. The three exemplary molding structures 13 and 14 are discrete molding structures. These molding structures are equidistant from each other in the extended region 3 (especially in the hollow cylindrical section 11 of the extended region 3) in the circumferential direction around the longitudinal axis A. As can be seen externally, an azimuth angle region 20, different from these molding structures, is constructed between these molding structures 13 and 14. Therefore, these two adjacent molding structures 13 and 14 are spaced apart from each other in the circumferential direction around the longitudinal axis A. The azimuth angle region 20 is specifically provided for positioning the carrying part of the washing drum thereon. Furthermore, in the molding structure 13 and in the Figure 1 Another azimuth angle region is also constructed between another molded structure that is not visible in the image. Similarly, in molded structure 14 and in... Figure 1 Another azimuth angle region is constructed between the third molding structure that is not visible in the middle. These other azimuth angle regions are configured as follows: another driving part can be arranged on the inner side of the casing wall 1.

[0065] Molding structure 13 is configured as a continuous molding area. This molding area is formed only partially around the longitudinal axis A. Similarly, molding structure 14 is configured as a continuous molding area and is formed only partially around the longitudinal axis A. Each molding structure 13, 14 has a plurality of molding elements 15. Only illustratively and exemplaryly, here... Figure 1 Some of the molded elements 15 are provided with reference numerals. In particular, as in this Figure 2 As can be better seen in the image, the molding structures 13 and 14 are constructed in a honeycomb structure. This also means that the molding elements 15 are directly adjacent to each other. This also means that the boundary profile of one molding element is simultaneously the boundary profile of the adjacent molding elements. For example, in this… Figure 2 As can be seen in an advantageous embodiment, when viewed laterally from the housing wall 1, a molded element is constructed in a teardrop shape. This means that, in such a side view, the boundary profile of such a molded element 15 is constructed in a teardrop (or bulge) shape. This boundary profile converges with opposite pointed ends in the azimuth angle. A boundary profile defines the opening entrance of the molded element 15, which is constructed as a cavity.

[0066] Such an external Figure 1 As can be seen, the housing wall 1 has fastening receiving portions 16. These fastening receiving portions 16 are provided for fastening the carrying part. In particular, when the carrying part is constructed as a separate component.

[0067] Furthermore, in this embodiment, centering openings are also constructed in the azimuth region 20. Preferably, such centering openings are constructed in each azimuth region 20. These centering openings (or centering receiving portions 17) are constructed in a horizontal plane. This allows the housing wall 1 to be in a horizontal reference position after a specific intermediate manufacturing state. This is particularly advantageous so that the molded structures 13, 14 can be subsequently produced during manufacturing and can be produced and oriented accordingly with appropriate horizontal accuracy.

[0068] In addition, the casing wall 1 has at least one compensating molding portion 18.

[0069] Overall, the compensation molding section is a separate pressing / molding process. The compensating element is constructed spaced apart from these molding structures 13, 14 and thus spaced apart from the molding element 15. In one embodiment, the compensating molding portion 18 is constructed in the edge strip 8. In another embodiment, the compensating molding portion 18 may additionally or alternatively be constructed in the edge strip 9. In one embodiment, at least one compensating molding portion 18 is entirely constructed in the edge strip 8. The explanation given in this respect, as well as the explanation below, also applies to other exemplary embodiments, and additionally or alternatively to the edge strip 9.

[0070] In one embodiment, the compensating molding portion 18 is specifically designed to locally adapt the height h of the edge strip 8 measured in the axial direction and thus in the direction of the longitudinal axis A. This height h is measured between the first edge 6 and the edge 4 of the first hollow cylinder. Specifically, the compensating molding portion 18 is provided and constructed to adapt (or compensate) this height h. Thus, this height h is formed over the entire edge strip 8 in the circumferential direction around the longitudinal axis A such that there is a maximum deviation of + / - 0.3 mm.

[0071] This can be seen relative to the reference height.

[0072] In one embodiment, at least one compensating molding portion 18 is configured in the circumferential direction around the longitudinal axis A, and thus in an azimuthal position, at which the azimuth region 20 also extends. In particular, at least one compensating molding portion 18 is formed entirely within the azimuthal length of the azimuth region 20. In one embodiment, the compensating molding portion 18 may be configured in the tapered section 10. This may be entirely or at least partially the case.

[0073] In one embodiment, the compensating molding portion 18 is a groove constructed in the circumferential direction around the longitudinal axis A. The compensating molding portion 18 forms an annular segment. The housing wall 1 constructed therein is a component of the laundry drum. Thus, the laundry drum may additionally have a bottom plate. The bottom plate is independent of the housing wall 1. The bottom plate is connected to the housing wall 1. In this regard, a hemming process (or folding process) may be provided. This forms a folded connection between the edge strip 9 and the bottom plate.

[0074] In one embodiment, such a laundry drum may have an end face bottom. This end face bottom is independent of the housing wall 1. This end face bottom can be connected to the housing wall 1 via a hemming process (or folding process). In particular, here, the edge strip 8 is connected to the end face bottom via a folding connection. This is a direct connection.

[0075] exist Figure 2 The casing wall 1 is shown in a side view. For clarity, the molding structure 14 is not shown here. Furthermore, as also... Figure 1 Like in the middle, in Figure 2 The diagram shows a connection portion 19, on which the mating edges of the substrate of the housing wall 1, which is shaped as a hollow cylinder, are connected to each other (especially welded together). Here, this is formed in the azimuth region 20.

[0076] To manufacture the roller wall or casing wall 1, a base plate for the casing wall 1 is first provided. This plate component is unfolded from a circulating reel and accordingly cut to a specific length.

[0077] Subsequently, the plate is rolled into a hollow cylinder 2 and joined together at their facing end edges. In particular, a welded connection is formed here at the joint 19. The hollow cylinder 2 thus provided is then locally expanded radially in the production equipment. For this purpose, corresponding expansion elements of the production equipment can be introduced into the completed hollow cylinder 2, or the hollow cylinder 2 can be positioned accordingly such that the hollow cylinder 2 surrounds these expansion elements. These expansion elements (or forming molds) then move radially, thereby forming radially bulging expansion regions 3 in the hollow cylinder 2.

[0078] Then, in another production step, the already explained centering receiving section 17 is preferably formed.

[0079] It can be configured to form the fastening receiving section 16 simultaneously or before or after the centering receiving section 17 is generated.

[0080] If the centering receiving portion 17 is produced, the housing wall 1 (as it has been manufactured up to that point) is lifted axially and placed in a reference position. Therefore, the housing wall 1 is no longer located at the edge receiving portion of the production equipment with its edge (or ridge), but is hereby lifted. For this purpose, corresponding elements can be inserted into the centering receiving portion 17 and then adjusted to the desired reference position, which is the accurate horizontal orientation of the hollow cylinder hereby manufactured. Then, in this reference position, in further subsequent production steps, pre-tensioning is preferably performed on the edge strips 8 and / or 9. In particular, in this regard, azimuth extension is performed on the edge strips 9 and / or 8.

[0081] It is possible that deformation of the centering opening 17 may also occur during molding. Therefore, in an advantageous embodiment, the creation of the centering opening 17 is also performed simultaneously with the manufacture of the fastening receiving portion 16. As a result, these centering openings 17 can be recalibrated for subsequent processes (especially for the flanges or edge strips 8, 9 for hemming or folding).

[0082] In another production step, molded structures 13, 14 are then produced in extended region 3. In particular, these individual molded structures 13, 14 are produced simultaneously. In one embodiment, the final diameter of edge strips 8 and / or edge strips 9 is also produced simultaneously with the production of the corresponding molded structures 13, 14. The pre-tightened state here is formed into the final convex geometry of these edge strips 8, 9.

[0083] In further (especially immediately thereafter) production steps, at least one compensating molded part 18 is produced.

[0084] In addition, Figure 2 As can also be seen, multiple overflow holes 21 are constructed on the casing wall 1. These overflow holes 21 are generated in a positional manner. These overflow holes 21 are generated in a positional manner on the molding element 15. Based on the arrangement of these molding elements 15, these overflow holes 21 are constructed in rows and columns.

[0085] As in Figure 2 As can be seen, these molded elements 15 are shaped into inwardly bulging domes or protrusions (i.e., towards the longitudinal axis A). Therefore, in Figure 2In the external view shown, these molded elements 15 are recessed and bulge inward to a certain extent. These molded elements 15 have inlets 15a on the outer side 11a of region 11. The inlets 15a are defined by a boundary profile. The boundary profile has a first profile segment 15b and a second profile segment 15c. These two profile segments 15b and 15c are respectively wavy. These two profile segments 15b and 15c are particularly symmetrical about the horizontal line. In the azimuth direction, the boundary profile of a molded element 15 has a first end 15d and an opposite end 15e. In this side view, the entire boundary profile of the inlet 15a of a molded element 15 is teardrop-shaped. At these opposite ends in the azimuth direction, this shape of the boundary profile tapers, particularly converging at sharp angles.

[0086] On the outer side 11a, portions of the boundary contours of the directly adjacent and connected molding elements 15 terminate in free edge edges 22. In this case, the free edge edges 22 are continuous planar strips (or planar edge lines). Therefore, the free edge edges 22 define two adjacent molding elements 15 respectively. Edge edges 22 are also formed on the corresponding ends 15b and 15c.

[0087] As in Figure 2 As can be seen, these overflow holes 21 are constructed on these edge edges 22. These overflow holes 21 are constructed entirely within the edge edges 22, with their entire surface. For clarity, in Figure 2 For example, only some overflow holes 21 are drawn.

[0088] In one embodiment, the adjacent ends 15e and 15b of two molded elements 15 connected to each other in the circumferential direction around the longitudinal axis A are formed on a boundary profile node 23. An overflow hole 21 is formed on this boundary profile node 23. Relatedly, another boundary wall node is provided. Exemplarily, in Figure 2 Another boundary profile node 24 is shown, on which the two ends 15e and 15b of the two interconnected molded elements 15 terminate (or are constructed) again. At least one overflow hole, and specifically exactly two overflow holes 21, are constructed on this boundary profile node 24. This is also... Figure 2 Examples are shown in the magnified segments that represent other regions.

[0089] From this point on Figure 2 As can be seen, a plurality of (ten in this embodiment) molding elements 15 are respectively arranged in an axial arrangement aligned with each other. Similarly, in the circumferential direction around the longitudinal axis A, a plurality of molding elements 15 are arranged in an arrangement connected to each other at the same axial position.

[0090] Thus visible from the outside, and exemplarily in Figure 2 The first axial arrangement 25 shown is adjacent to a second arrangement 26 of molding elements 15. These molding elements 15 of the second arrangement 26 can also be arranged relative to each other in the axial direction. As can be seen, the second arrangement 26 is offset from the molding elements 15 of the first arrangement 25 by half the length of a molding element 15 in the circumferential direction around the longitudinal axis A. Similarly, in the axial direction, there is a misalignment of half the axial height of a molding element between the molding elements 15 of the first arrangement 25 and the molding elements 15 of the second arrangement 26. This then alternates with another arrangement of molding elements 15 in the molding structure 13. Accordingly, this is also configured in the case of another molding structure 15, etc., which is advantageously present. Therefore, the aspects explained for the molding structure 13 also apply to other molding structures of the roller wall or housing wall 1.

[0091] In one embodiment, this results in overflow holes, specifically exactly two overflow holes 21, being generated at each boundary profile node 23, 24 of these correspondingly arranged molding elements 15 of the molding structure 13.

[0092] In manufacturing these overflow hole arrangements, it can be configured such that the corresponding cutting unit of the production equipment can simultaneously produce twenty overflow holes 21. These overflow holes can be, for example, those constructed on the ends 15d in the axial arrangement of the molding elements, and those overflow holes to be produced on the opposing ends 15e of these particular arrangement of molding elements 15. Thus, in the second embodiment, these twenty overflow holes can be cut simultaneously. However, this is merely an embodiment and not only the number but also the order can occur differently.

[0093] Starting from this solution, when the twenty first overflow holes 21 are cut open, the casing wall 1 can be further rotated about the longitudinal axis A such that another overflow hole is created at the ends 15d and 15e of the next arrangement 25 constructed at the same axial position. This is done until all arrangements constructed at the same axial position are created at the respective ends 15d and 15e of the corresponding molded elements 15, each having an overflow hole 21.

[0094] Next, the housing wall 1 can be moved in the axial direction at half the height of a molding element 15. Then, overflow holes 21 can be cut in a correspondingly reverse manner: these overflow holes 21 are cut in another arrangement of the molding structure 13 that is hereby offset in the axial direction by half a molding element 15.

[0095] Therefore, a pair of overflow holes 21 are constructed on each boundary contour node 23, 24. Since the adjacent molding elements 15 face each other and the ends 15d and 15e terminating in the respective boundary nodes 23 or 24 are respectively configured to have one (in particular, only one unique) overflow hole 21.

[0096] In particular, when constructing multiple individual molding structures 13, 14, overflow holes 21 are simultaneously cut in the corresponding molding structures 13, 14. Therefore, in this regard, three identically constructed and identically operating cutting units are provided.

[0097] For clarity, Figure 2 Only one boundary profile node 23 and one boundary profile node 24 are respectively provided with corresponding reference numerals. In principle, such boundary profile nodes 23 or 24 are formed on each transition zone between two adjacent molding elements 15 and their respective ends 15d and 15e facing each other. Thus, two overflow holes 21 are also formed at each of these locations.

[0098] exist Figure 3 The diagram schematically illustrates a household appliance 27 for caring for laundry. The appliance 27 is, in particular, a washing machine. This washing machine has a housing 28. A washing drum 29 is arranged within the housing 28, the washing drum 29 having a cover wall 1. Furthermore, the washing drum 29 has a bottom plate 30 and an end face bottom 31, which is only symbolically indicated here by reference numerals. The longitudinal axis A is oriented perpendicular to the plane of the drawing. The washing drum 29 can rotate about this longitudinal axis A. Additionally, a door 32 is pivotally arranged on the housing 28. Thus, the washing drum 29 can be closed from the front.

[0099] Furthermore, the lye container 33 of the household appliance 27 is also shown with dotted lines. The washing drum 29 is received in this lye container 33. Additionally, in Figure 3 The actuating parts 34, 35, and 36 are shown only symbolically, and these actuating parts are arranged on the inner side of the housing wall 1. These actuating parts 34 to 36 are configured to actuate the laundry that has been placed inside when the laundry drum 29 rotates.

[0100] Furthermore, the casing wall 1 is also provided with multiple overflow holes. These overflow holes are through-holes, allowing the lye solution in the washing drum 29 to reach the outside and into the lye solution container 33. These overflow holes can be formed, for example, in areas where molded structures 13, 14 are formed.

[0101] In one embodiment, to simplify the construction of the production equipment and the limited mounting space for the retaining plate of the punch used to create overflow holes in the housing wall, the radial arrangement of the punch relative to the center point of the housing is eliminated. This means that the longitudinal axis of the punch is not perpendicular to the inside of the housing wall. In particular, this also means that the longitudinal axes of the two punches are not oriented at an angle relative to each other, but rather that these longitudinal axes of the punches are arranged parallel to each other.

[0102] In particular, this installation space becomes crucial when the diameter of the hollow cylinder of the housing wall is small (e.g., between 480 mm and 520 mm).

[0103] In particular, these embodiments achieve a parallel arrangement of the punches (or the longitudinal axes of these punches). Therefore, the number of plate ejectors can be minimized accordingly to avoid markings on the product. An advantage lies in the use of a standard normal, in which radial shape adjustments (casing radius) can be omitted because the support surface of the plate ejector is minimized. Consequently, markings on the product are also virtually invisible due to the parallel arrangement of the punch die (outside the hollow cylinder) and the punch ejector (inside the hollow cylinder). The punch die and punch ejector work together to cut overflow holes in the casing wall.

[0104] List of reference numerals

[0105] 1. Enclosure wall

[0106] 2. Hollow cylinder

[0107] 3. Extended Area

[0108] 4. Edge of the first hollow cylinder

[0109] 5. Edge of the second hollow cylinder

[0110] 6 First Edge

[0111] 7 Second Edge

[0112] 8 Edge stripes

[0113] 9. Edge stripes

[0114] 10 Conical Section

[0115] 11 Hollow cylindrical section

[0116] 11a Outer side

[0117] 12 Conical Regions

[0118] 13 Molded Structure

[0119] 14 Molded Structure

[0120] 15 Molded Components

[0121] 15a Entrance

[0122] 15b First contour section

[0123] 15c Second contour section

[0124] 15d First end

[0125] 15e Second end

[0126] 16 Fastening receiving part

[0127] 17. Open your mouth with a calm mind.

[0128] 18 Compensation Molding Section

[0129] 19 Connection parts

[0130] 20 azimuth zone

[0131] 21 Overflow hole

[0132] 22 Edges and ridges

[0133] 23 Boundary contour nodes

[0134] 24 Boundary contour nodes

[0135] The first arrangement along the 25-axis

[0136] 26 Axial Second Arrangement

[0137] 27 Household appliances

[0138] 28. Shell

[0139] 29 Laundry drum

[0140] 30 Bottom plate

[0141] 31 End face bottom

[0142] 32 doors

[0143] 33. Alkali solution container

[0144] 34. Carrying Department

[0145] 35. Carrying Department

[0146] 36. Carrying Department

[0147] h height

[0148] A. Vertical axis

Claims

1. A method for manufacturing a casing wall (1) for a laundry drum (29), the method comprising the following steps: - Metal sheets are provided; - The metal plate is formed into a hollow cylinder (2), thereby forming the basic shape of the cover wall (1) of the laundry drum (29) and the basic geometry of the cover wall (1) of the laundry drum (29); in, Subsequent steps are performed only after the hollow cylinder (2) has been formed; - At least one coherent molded structure (13, 14) is formed in the housing wall (1), wherein, for this purpose, a plurality of molded elements (15) are formed relative to each other in a tightly spaced manner; - An overflow hole (21) is formed on the molding element (15) in a position defined by the location; - Overflow holes are sequentially cut in the hollow cylinder (2) of the casing wall (1), wherein overflow holes (21) are generated simultaneously in each section; Its features are: - At least some of the molding elements (15) are generated directly adjacent to each other, such that the boundary profile (15b, 15c) of one molding element (15) is simultaneously and locally the boundary profile (15b, 15c) of another molding element (15), wherein at least one overflow hole (21) is generated on the boundary profile (15b, 15c). - The boundary profiles (15b, 15c) terminate in a common free edge (22), wherein the overflow hole (21) is formed in the common free edge (22); and - The overflow hole is cut from the inside out.

2. The method according to claim 1, in, The casing wall is the casing wall of a laundry drum (29) for a household appliance used for caring for laundry.

3. The method according to claim 2, in, The overflow hole (21) is formed entirely in the edge edge (22).

4. The method according to any one of claims 1-3, in, Viewed in the circumferential direction around the longitudinal axis (A) of the hollow cylinder (2), the boundary profiles (15b, 15c) of a molding element (15) are generated with a first end (15d), at which a first boundary profile node (23) is generated, and a plurality of boundary profiles (15b, 15c) terminate at the first boundary profile node, wherein at least one overflow hole (21) is generated at the first boundary profile node (23), and / or The boundary profiles (15b, 15c) are generated with a second end (15e) offset from the first end in azimuth angle, and a second boundary profile node (24) is generated at the second end. The plurality of boundary profiles (15b, 15c) terminate at the second boundary profile node, wherein at least one overflow hole (21) is generated at the second boundary profile node (24).

5. The method according to any one of claims 1-3, in, A molded element (15) is produced as an arch that arches inward about the longitudinal axis (A) of the hollow cylinder (2), the boundary surface of which is spherically bulging and tapers sharply at the azimuth ends (15d, 15e) of the boundary profile (15b, 15c).

6. The method according to claim 5, in, Multiple molded elements (15) of this type are produced as a honeycomb structure in the housing wall (1).

7. The method according to claim 6, in, The first arrangement (25) of the axially oriented molding elements (15) is formed relative to the second arrangement (26) of the axially oriented molding elements (15) in the azimuth direction with half of the molding elements (15) of the first arrangement (25) overlapping with the molding elements (15) of the first arrangement (25) in the axial direction, and with half of the molding elements (15) of the first arrangement (25) overlapping with the molding elements (15) of the first arrangement (25) in the axial direction.

8. The method according to claim 7, in, Multiple overflow holes (21) are simultaneously generated by the overflow hole generating unit of the production equipment in the boundary profiles (15b, 15c) of the molding elements (15) arranged (25, 26).

9. The method according to claim 8, in, Multiple overflow holes (21) are simultaneously generated at opposite ends (15d, 15e) of the boundary profiles (15b, 15c) of the molded elements (15) arranged (25, 26).

10. The method according to claim 9, in, After a first arrangement (25) of molding elements (15) is formed in a first axial position, and an overflow hole (21) is formed in the molding elements of this arrangement, the hollow cylinder (2) is axially offset by a stroke corresponding to half the axial height of one molding element (15). Then, overflow holes (21) are simultaneously generated at the opposite ends (15d, 15e) of the boundary profile of the second arrangement (26) of the molding elements (15), which are generated axially relative to the already perforated arrangement by half a molding element (15).

11. The method according to any one of claims 1-3 and 6-10, in, Three separate, tightly perforated molded structures (13, 14) are formed on the casing wall (1), which are equidistantly formed in the circumferential direction surrounding the longitudinal axis (A) of the hollow cylinder (2).

12. The method according to claim 11, wherein, Three identical overflow hole cutting units are set up, and the overflow hole (21) is cut simultaneously in the corresponding separate molding structures (13, 14).

13. The method according to claim 11, in, In the middle region of the housing wall (1), between the molding structures (13, 14), the carrying parts (34, 35, 36) are generated by molding.

14. The method according to any one of claims 1-3, 6-10, and 12-13, in, After the hollow cylinder (2) is produced, an extended region (3) is created in the casing wall (1) by molding. The extended region is created as a surrounding and outwardly arched annular bulge. In the extended region (3), a molded structure (13, 14) with multiple molded elements (15) is generated that is independent of the extended region.

15. The method according to any one of claims 1-3, 6-10, and 12-13, in, A bottom plate (30) is installed on the hollow cylinder (2), so that the washing drum (29) closes at one end of the hollow cylinder (2) and / or an end face bottom (31) is installed on the hollow cylinder (2).

16. The method according to any one of claims 1-3, 6-10, and 12-13, in, The overflow hole (21) is generated as a round hole.

17. The method according to claim 4, in, The contour segment terminates at the first boundary contour node and generates exactly two overflow holes (21) at the first boundary contour node (23).

18. The method according to claim 4, in, The contour section terminates at the second boundary contour node, and exactly two overflow holes (21) are generated at the second boundary contour node (24).

19. A laundry drum (29) for a household appliance used for caring for laundry, the laundry drum being obtained by the method according to any one of the preceding claims.

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