Method for producing a shell wall for a laundry drum with a compensation arrangement, casing wall for a laundry drum and laundry drum
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Solution Overview
Problem
The production of laundry drum jacket walls faces challenges due to geometric and dimensional tolerances, leading to imprecise positioning of embossing elements and potential burrs, especially when close-meshed embossed structures are used, resulting in undesirable deviations and mechanical instability in connections.
Innovation Solution
A method involving forming a metallic plate into a hollow cylinder with a radially bulging expansion region and creating a close-meshed embossed structure, including compensation embossings to adjust the axial height of the edge strip, ensuring precise geometry and reduced dimensional deviations, thereby enhancing the connection stability between the edge strip and other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a close-meshed embossed structure is created in the expansion area, then the geometric accuracy and mechanical stability are improved, but the positioning precision of flood holes deteriorates due to tolerances
Solution Approach 1:
The patent applies preliminary action by creating the expansion area and embossed structure before producing the flood holes. The hollow cylinder is first expanded radially outward to form the expansion area, then embossed elements are formed in this expanded region, and finally flood holes are produced. This sequence allows the embossed structure to be established as a reference framework before hole positioning, mitigating tolerance accumulation.
Solution Approach 2:
The patent applies local quality by creating a radially expanded area with different geometric properties than the base hollow cylinder. The expansion area has increased radial dimensions and altered wall thickness characteristics, allowing the embossed structure to be formed with enhanced local geometric accuracy while isolating the flood hole positioning challenges to specific zones within this expanded region.
2Stability of the object's composition
If the hollow cylinder is radially expanded to create an expansion area, then the mechanical stability is improved, but the roundness and dimensional tolerances of the hollow cylinder deteriorate
Solution Approach 1:
The radial expansion is applied locally to specific regions of the hollow cylinder rather than uniformly across the entire structure. This creates an expansion area with enhanced mechanical stability and embossed element capacity while preserving the roundness and dimensional tolerances of adjacent non-expanded regions. The expansion area becomes a localized zone with modified properties suitable for bearing embossed structures.
Solution Approach 2:
The hollow cylinder is effectively segmented into different functional zones: the expanded area that provides mechanical stability and embossed element support, and the non-expanded areas that maintain original dimensional tolerances and roundness. This segmentation allows different regions to serve different functions without compromising overall manufacturing precision.
3Adaptability or versatility
If the edge strip height varies in the circumferential direction, then the adaptability to different production tolerances is improved, but the connection stability to front panel and base pane deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying the height of the edge strip in the circumferential direction according to a predetermined pattern or function. Rather than maintaining a uniform height, the edge strip height is modified to compensate for expected tolerance variations in the production process, allowing for better adaptation to dimensional variations while maintaining connection stability through controlled parameter variation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a more precise and stable geometric design of the jacket wall, minimizing axial deviations to less than +/- 0.4 mm, improving the accuracy and mechanical stability of the laundry drum's edge strip connections, and allowing for precise alignment and positioning of embossing elements.
Implementation Method 1
forming the metallic plate into a hollow cylinder
Implementation Method 2
a radially outwardly bulging expansion area is created in the hollow cylinder
Implementation Method 3
a multiplicity of embossed elements are created in the expansion area
Data Source
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AI summary
One aspect of the invention relates to a method for producing a shell wall (1) for a washing drum (22) for a household appliance (30) for the care of laundry items, comprising the following steps: - generating an expansion area (3) in a hollow cylinder (2), wherein the expansion area (3) is generated completely circumferentially around a longitudinal axis (A) of the hollow cylinder (2), and a circumferential rim (6, 7) of the expansion area (3) is generated spaced apart from a hollow cylinder rim (4, 5) of the hollow cylinder (2), so that an annular rim strip (8, 9) of the hollow cylinder (2) is formed between the rim (6, 7) of the expansion area (3) and the hollow cylinder rim (4); - generating at least one embossing structure (13, 14) with a plurality of embossing elements (15) in the expansion area (3);- Generating at least one compensation embossing (18) in the edge strip (8) and/or in a conical section (10, 12) of the expansion area (3) for local adjustment of the axially dimensioned height (h) of the edge strip (8, 9).;