Rigid Sheet Blank Tabs and Seams for Tool-Free Bending
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Solution Overview
Problem
The existing methods for forming sheet metal components through bending are costly and inefficient, as they require specialized tooling and operators, and can result in incorrect bending directions and low load-bearing capacity due to weakening cuts, which also cause material to stick during laser cutting and interfere with machinery.
Innovation Solution
A rigid sheet blank with sections configured to be bent about different axes, featuring tabs and seams that allow for hand-bending without tools, with interlocking elements to increase load-bearing capacity and prevent material sticking during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If weakening cuts are made in the metal sheet blank to facilitate hand bending, then the ease of operation is improved, but the strength of the bent sheet component deteriorates
Solution Approach 1:
The weakening cut is segmented into two parts: a first cut extending from the peripheral edge toward the center, and a second cut extending from the opposite peripheral edge toward the center, with a bridge portion connecting them. This segmentation allows bending facilitation while maintaining structural integrity through the bridge portion.
Solution Approach 2:
The weakening cut provides localized flexibility at the bend line while the bridge portion maintains overall structural strength. The cut is positioned specifically at the bend line where flexibility is needed, while the bridge portion connects to peripheral edges to maintain load-bearing capacity in critical areas.
2Device complexity
If conventional weakening cuts are used to enable hand bending, then the need for specialized tooling is eliminated, but the bending direction control deteriorates
Solution Approach 1:
The bridge portion has an asymmetric configuration with a first length from the first peripheral edge and a second length from the second peripheral edge. This asymmetry, combined with the bridge portion's orientation, provides directional guidance during bending, ensuring the blank bends in the correct direction without requiring specialized tooling.
Solution Approach 2:
The weakening cut with its bridge portion is pre-configured in the blank before bending. The bridge portion's specific geometry and orientation are established in advance to guide the bending direction, eliminating the need for tooling while ensuring accurate bending direction.
3Productivity
If laser cutting is used to produce the metal sheet blank, then the productivity is improved, but material sticking to the sheet deteriorates
Solution Approach 1:
Instead of trying to prevent material from sticking during laser cutting, the design embraces the sticking phenomenon by configuring the bridge portion to connect to peripheral edges. The peripheral edges act as anchor points that prevent the bridge portion from detaching and interfering with the laser head, effectively inverting the problem approach.
Solution Approach 2:
The bridge portion serves as an intermediary element that connects the weakening cut to the peripheral edges. This intermediary structure prevents cut material from completely detaching and interfering with the laser cutting process, allowing continuous operation without head stops.
Data Source
AI summary
A rigid sheet blank includes a first section configured to be bent about a first axis and a second section configured to be bent about a second axis. The first section has a peripheral edge and at least one tab extending from the peripheral edge. The at least one tab is bendable by hand. The second section defines at least one opening configured for receiving a respective one of the at least one tab during bending of the rigid sheet blank.