Washing machine and manufacturing method of door
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Solution Overview
Problem
Conventional washing machine door decoration methods, such as color spray and chromium plating, are not eco-friendly and increase manufacturing costs, while also failing to provide an elegant metallic appearance.
Innovation Solution
The washing machine door design incorporates a transparent second upper door and an opaque first upper door, integrated through double injection molding, with a lower door featuring an inclined flange and contraction preventing part, creating a metallic color effect without post-processing, and a manufacturing method that includes forming the door components through injection molding to maintain an inclined surface and prevent contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional post-processing methods (color spray, chromium plating) are used for door decoration, then metallic color and elegant design are achieved, but manufacturing costs increase and environmental pollution occurs
Solution Approach 1:
The metallic color effect is built into the door structure during the injection molding process itself, rather than applying it later through post-processing. The inclined flange and contraction preventing part are formed as integral features of the door body, eliminating the need for subsequent painting or plating operations.
Solution Approach 2:
The door structure itself generates the metallic appearance through its geometric features (inclined flange at specific angles) and material properties, without requiring external decorative coatings. The contraction preventing part automatically maintains the inclined surface during manufacturing, making the system self-sufficient for achieving the desired aesthetic.
2Shape
If conventional post-processing methods are used for door decoration, then metallic color is achieved, but waste water and pollutants are generated
Solution Approach 1:
The harmful post-processing steps (color spray, chromium plating) are completely removed from the manufacturing process. The metallic appearance is achieved through the door's structural design and injection molding process alone, extracting and eliminating the polluting operations from the production workflow.
3Ease of manufacture
If the lower door is formed through injection molding without contraction prevention, then manufacturing is simplified, but the inclined part contracts and loses its shape
Solution Approach 1:
The contraction preventing part is designed into the mold structure before injection molding occurs. This preliminary feature counteracts the natural contraction tendency of the plastic material during cooling, preventing distortion of the inclined part before it can occur and maintaining the desired geometric precision.
Data Source
AI summary
A washing machine including a door to open and close an opening for laundry. The door includes a first upper door, a second upper door disposed to allow at least one portion of the first upper door to be seen therethrough, and a lower door. The lower door includes a contraction preventing part to prevent the lower door from contracting when molded.