Reverse Pressure Can End Structure for Thin-Metal Strength
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Solution Overview
Problem
Existing can ends made from thicker materials are inefficient in terms of metal consumption, and when made from thinner materials, they often deform under pressure changes during processing.
Innovation Solution
The development of a can end design that incorporates a down-gauging construct, featuring an annular ridge and an annular countersink, allowing for the use of thinner materials while maintaining structural integrity against both internal and external pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If can ends are made from thinner materials to reduce metal consumption, then material usage decreases, but the can ends deform under pressure changes during processing
Solution Approach 1:
The can end structure incorporates localized geometric features including an annular ridge, an annular countersink, and a tapered portion that concentrate structural strength in specific regions. These local geometric modifications allow the overall material thickness to be reduced while maintaining adequate strength where pressure resistance is most critical.
Solution Approach 2:
The invention transitions from a flat planar can end to a three-dimensional structured form by adding the annular ridge that extends radially outward and the annular countersink that creates a depression. This dimensional transformation distributes stress more effectively throughout the structure, enabling thinner material to withstand processing pressures.
2Reliability
If can ends are made from thicker materials to resist deformation under pressure, then structural integrity improves, but metal consumption increases
Solution Approach 1:
Rather than uniformly thickening the entire can end, the invention applies geometric strengthening features (annular ridge, countersink, tapered portion) only in specific locations where structural support is most needed. This localized approach achieves the required deformation resistance while minimizing overall material usage.
Solution Approach 2:
The can end structure effectively creates a composite geometry by combining multiple features (ridge, countersink, tapered portion) in a single integrated structure. This composite geometric design provides enhanced structural performance equivalent to thicker material but achieved through intelligent form rather than increased mass.
3Ease of manufacture
If can ends are made from thinner materials, then manufacturing cost decreases, but the can ends cannot withstand processing pressures
Solution Approach 1:
The annular ridge, annular countersink, and tapered portion create localized strength zones that provide adequate pressure resistance in thin-walled construction. These geometric features are formed through standard stamping operations, maintaining manufacturing simplicity while achieving the required strength for processing pressures.
Solution Approach 2:
The annular ridge and countersink introduce curved surfaces and geometric complexity that distribute stress more effectively than flat surfaces. These curved features enhance pressure resistance in thin material by reducing stress concentration points and distributing loads more uniformly across the can end structure.
Data Source
Figure 1~2
Figure 3
Figure 4~4A
AI summary
A can end includes a center panel, an annular portion disposed about the center panel, a chuck wall disposed about the annular portion, a curl extending radially outwardly from the chuck wall, the annular portion including a subsurface step.