Can Shell Countersink Structure for Buckle Pressure Resistance

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Solution Overview

Problem

Existing can ends made from thinner gauges of metal face insufficient resistance to buckle pressure during processing, necessitating the development of improved structural designs to maintain strength while reducing material usage.

Innovation Solution

A can shell design featuring a center panel, inclined panel wall, annular countersink, chuck wall with a curved kick portion, and a curl, along with specialized tooling to form this structure, which enhances resistance to buckle pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If thinner gauge metal is used to reduce material consumption, then material usage is reduced, but resistance to buckle pressure becomes insufficient

Engineering Contradiction:

Improvematerial consumptionVSAvoidresistance to buckle pressure

Core Design Contradiction:

Loss of substanceVSStrength

Solution Approach 1:

The patent applies curvature by forming the chuck wall with a kick portion that has a curved shape beginning at a point lower than the lowest point of the inclined panel wall. This curved geometry distributes stress more effectively during buckling, allowing thinner gauge metal to maintain sufficient resistance to buckle pressure while reducing material consumption.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent adds a vertical dimension to the chuck wall structure by extending the kick portion below the lowest point of the inclined panel wall. This creates an additional structural dimension that provides buckle resistance without increasing horizontal material usage, thereby reducing overall material consumption while maintaining strength.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If a curved kick portion is added to the chuck wall, then resistance to buckle pressure is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveresistance to buckle pressureVSAvoidstructural complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent segments the chuck wall into distinct functional portions: an outer countersink wall, a kick portion with curved shape, and an upper chuck wall portion. This segmentation allows each portion to be formed by specific tooling stations, making the complex geometry manageable through modular forming operations while achieving improved buckle resistance.

Inventive Principle:

Principle #1Segmentation

3Stability of the object's composition

If the kick portion extends lower than the inclined panel wall, then structural integrity is improved, but forming difficulty increases

Engineering Contradiction:

Improvestructural integrityVSAvoidforming difficulty

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent incorporates the kick portion geometry into the shell forming process itself, rather than requiring subsequent operations. The lower tool assembly includes a die center with a notched edge that forms the kick portion during the initial shell forming operation, eliminating the need for additional forming steps and reducing overall manufacturing difficulty despite the complex geometry.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250360554A1Can shell, and associated tooling and method

Publication Date: 2025.11.27 STOLLE MACHINERY CO LLC

AI summary

A can shell includes a center panel, an inclined panel wall extending at a downward angle from the center panel, an annular countersink formed around the inclined panel wall, the annular countersink including an inner countersink wall and an outer countersink wall, a chuck wall extending from the outer countersink wall, the chuck wall including a kick portion having a curved shape beginning at a point lower than a lowest point of the inclined panel wall, and a curl extending radially outwardly from the chuck wall.