Can End Bead Redistributes Material for Strength
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Solution Overview
Problem
Existing methods for producing can ends do not effectively utilize material from the center panel to achieve the desired geometry and strength, particularly in forming easy-open ends, as they fail to efficiently redistribute material inwardly without altering the countersink features.
Innovation Solution
A method involving forming a can end shell with a seaming panel, countersink bead, and center panel in a shell press, followed by transferring the shell to a conversion press where material is moved inwardly from the shell features to set the final geometry, incorporating features like a bead or series of beads in the center panel to enhance strength and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If material is moved inwardly from the center panel to set final geometry, then the can end strength and uniformity are improved, but the countersink features may be altered radially outwardly
Solution Approach 1:
A bead or series of beads is formed in the center panel during the shell forming operation in advance of the conversion process. This preliminary action provides pre-positioned material that can be redistributed inwardly during conversion without requiring excessive force that would alter the countersink features.
Solution Approach 2:
The center panel is segmented into a bead structure that can be independently manipulated during conversion. The bead acts as a separate material reservoir that can be redistributed inwardly to strengthen the can end without affecting the outer countersink region.
2Quantity of substance
If a higher center panel or panel step is formed using a deeper center pad, then material availability for conversion is increased, but the shell press tooling complexity increases
Solution Approach 1:
Instead of creating a sharp panel step with a deeper center pad, the invention uses a curved bead structure in the center panel. This curved geometry provides the necessary material volume while distributing the forming stress more evenly, reducing the complexity requirements for the shell press tooling.
3Ease of manufacture
If existing methods are used to produce can ends, then the production process is simpler, but the can end peak and burst performance is insufficient
Solution Approach 1:
The bead is formed in the center panel during the initial shell forming operation, preparing the material distribution in advance. This allows the subsequent conversion process to focus solely on redistributing this pre-positioned material inwardly, achieving enhanced strength without significantly complicating the overall production process.
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 results in a stronger and more uniform can end with improved peak and burst performance by effectively utilizing material to form a platform and annular bead, enhancing the structural integrity of the converted end.
Implementation Method 1
pressing sheet metal into a shell, the shell having a seaming panel, countersink bead and center panel
Implementation Method 2
moving material inwardly from the end shell feature towards the center of the end to set the final geometry of the can end
Data Source
AI summary
A method of making a can end by forming a can end shell in a shell press; and converting the shell into a can end. The step of forming the can end shell includes pressing sheet metal into an end shell with a bead feature in the radially outer circumference of its centre panel. In a subsequent can end conversion operation material from the bead feature is used to set final geometry of the converted can end.