Laundry Machine Door Frame Assembly for Gapless Insert Fit
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Solution Overview
Problem
Existing laundry treatment machine loading doors face issues with fluff accumulation and visible gaps due to production-related tolerance deviations, which affect the seal's effectiveness and design aesthetics.
Innovation Solution
The method involves temporarily plastic-deforming the contact areas of the door frame parts before joining, allowing them to adapt to the geometry of the insert, such as a sight glass, and then solidifying to achieve a precise target thickness, ensuring a secure seal and optimal design alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal's elasticity is increased to compensate for dimensional deviations, then sealing reliability is improved, but the door frame thickness varies and gaps become visible
Solution Approach 1:
The contact areas are pre-heated to a plastically deformable state before the insert is positioned, allowing the material to flow and adapt to the actual dimensions of the insert. This preliminary softening action enables the contact areas to compensate for dimensional deviations before final assembly, ensuring both sealing reliability and uniform door frame thickness without visible gaps.
Solution Approach 2:
The material state of the contact areas is changed from solid to plastically deformable through heating, allowing dynamic adaptation to insert dimensional variations. After cooling, the material returns to its solid state with the new adapted geometry, simultaneously achieving reliable sealing and uniform thickness appearance.
2Shape
If production tolerances for the insert are tightened to eliminate gaps, then design aesthetics are improved, but manufacturing costs increase
Solution Approach 1:
Instead of tightening insert tolerances, the contact areas of the door frame are heated to change their material state to plastically deformable. This allows the contact areas to adapt to the actual insert dimensions within normal tolerance ranges, eliminating visible gaps without requiring expensive high-precision insert manufacturing.
Solution Approach 2:
The contact areas transition from a rigid solid state to a plastically deformable state during assembly, enabling dynamic adaptation to insert dimensional variations. This dynamic process allows normal tolerance inserts to achieve gapless joints, avoiding the need for expensive tight-tolerance inserts.
3Manufacturing precision
If the contact areas are made plastically deformable to adapt to insert geometry, then tolerance compensation is improved, but the joining process complexity increases
Solution Approach 1:
The complex mechanical system of precision-machined contact areas is replaced by a thermal field approach. Heating the contact areas to a plastically deformable state simplifies the joining process, allowing tolerance compensation through material flow rather than precise mechanical machining, thereby achieving high dimensional accuracy with reduced process complexity.
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 effectively compensates for large tolerances in insert dimensions, reducing production costs and ensuring a gapless, aesthetically pleasing joint, while maintaining high thickness accuracy and design specifications.
Implementation Method 1
at least the material of the contact areas is brought into a temporary plastically deformable state before the frame parts are joined
Implementation Method 2
forces are exerted on the contact areas so that they adapt to the geometry of the sight glass by deformation
Implementation Method 3
the contact areas are then brought back into a non-deformable (solid) state
Data Source
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AI summary
The invention relates to a method for producing a loading door (1) as well as a loading door (1) for a laundry treatment machine, comprising a door frame (2) and an insert (6) mounted within the door frame (2). The door frame (2) comprises at least an inner frame part (3) and an outer frame part (4) between which the insert (6) is introduced in such a way that at least one support surface (10) thereof rests on multiple support zones (20) of the door frame. In order to create a loading door, the thickness of which can always be adjusted within a given desired measure while allowing for compensation of the tolerance of the dimensions of the insert, and which meets the design requirements insofar as the inner frame part and the outer frame part rest on each other without a joint or a gap forming therebetween, at least the material of the support zones (20) is brought into a temporarily plastically deformable state before the frame parts (3, 4) are joined. Once the insert (6) has been introduced, forces are applied to the support zones (20) in such a way that the support zones (20) conform to the geometry of the insert (6) and the door thickness attains the given desired measure (28).