Folding Metal Back Plate Structure for Low-Stress Arc Bending
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Solution Overview
Problem
The known folding metal back plates are not properly configured, leading to excessive bending stress and reduced bending life due to semi-ellipse formation during folding.
Innovation Solution
A folding metal back plate design featuring two folding areas with varying unfolding lengths and opening ratios, where the first folding area's unfolding length is 0.2 to 0.5 times that of the second folding area, allowing for a smoother arc shape and reduced stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the folding metal back plate uses a conventional single folding area design, then the structure is simple, but the bending forms a semi-ellipse shape that generates excessive bending stress and reduces bending life
Solution Approach 1:
The folding plate portion is divided into multiple folding areas (first folding area and second folding area) with different unfolding lengths. This segmentation allows each area to contribute differently to the overall bending shape, transforming the bending path from a semi-ellipse to a true arc shape, thereby reducing bending stress and improving bending life without significantly increasing structural complexity.
2Device complexity
If the folding metal back plate uses equal unfolding lengths in all folding areas, then the design is simple, but the bending stress is excessive and the folding operation is not smooth
Solution Approach 1:
Different folding areas are assigned different unfolding lengths (the first folding area has an unfolding length of 0.2 to 0.5 times that of the second folding area). This local differentiation in geometric parameters enables the plate to form a true arc shape during bending, distributing stress more evenly and achieving smoother folding operation.
3Ease of manufacture
If the folding metal back plate uses a design without opening ratios control, then the manufacturing is simple, but the arc shape formation is imperfect and bending stress is high
Solution Approach 1:
The invention introduces specific parameter ranges for unfolding lengths (0.2 to 0.5 times ratio) and opening ratios (first opening ratio exceeds second opening ratio by 25% to 36%) to optimize the bending behavior. These parameter changes enable the folding plate to form a true arc shape with reduced bending stress, while the parameters are set within practical manufacturing ranges to maintain ease of manufacture.
Data Source
AI summary
A folding metal back plate includes a first plate portion, a second plate portion, and a folding plate portion connected to the first plate portion and the second plate portion. The folding plate portion has two first folding areas respectively disposed close to the first plate portion and the second plate portion, and a second folding area formed between the two first folding areas. The first folding area has multiple rows of spaced first openings. The second folding area has multiple rows of spaced second openings. Each first folding area constitutes a first unfolding length. The second folding area constitutes a second unfolding length. The first unfolding length of the first folding area is 0.2 to 0.5 times the second unfolding length of the second folding area.