Aluminum Beverage Can Bottom Geometry for Lightweight Pressure Resistance
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Solution Overview
Problem
Existing beverage can manufacturing methods face challenges in reducing the thickness of aluminum alloy sheets while maintaining or improving resistance to internal pressure and axial force, which are crucial for stability and stacking during production, transport, and storage.
Innovation Solution
A beverage can design featuring a concave dome with specific dimensions, a convex lower ring with increased width and concave deformations, combined with a reduction in dome thickness, enhances resistance to internal pressure and axial force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the aluminum alloy sheet is reduced to decrease can weight, then the weight of the can is reduced, but the resistance to internal pressure and axial force deteriorates
Solution Approach 1:
The bottom of the can is designed with a curved dome shape instead of a flat surface. This curvature distributes internal pressure more evenly across the structure, enhancing resistance to deformation while using less material. The convex lower ring and concave deformations further optimize this curvature effect to maintain strength at reduced thickness.
Solution Approach 2:
The bottom structure is divided into multiple functional zones: a central dome area, a convex lower ring, and concave deformations distributed around the perimeter. This segmentation allows each zone to perform its specific mechanical function - the dome handles internal pressure, the lower ring provides structural support, and the concave deformations prevent buckling - enabling weight reduction while maintaining overall strength.
2Quantity of substance
If the thickness of the aluminum alloy sheet is reduced to reduce material cost, then the quantity of substance is reduced, but the mechanical resistance (axial resistance, resistance to internal pressure, resistance to falling) deteriorates
Solution Approach 1:
Different regions of the can bottom have different thicknesses and curvatures optimized for their specific functions. The central dome area has one configuration for pressure resistance, while the peripheral lower ring and concave deformation zones have different geometries for structural support and buckling prevention. This local optimization allows minimal material usage while maintaining required mechanical resistance throughout the structure.
Solution Approach 2:
The bottom structure combines multiple geometric features (curved dome, convex ring, concave deformations) into a composite structural system. This composite geometry acts as a multi-functional structural element that provides pressure resistance, axial load bearing, and buckling prevention simultaneously, achieving mechanical resistance equivalent to thicker uniform material but with reduced overall material consumption.
3Productivity
If the dome thickness is reduced to improve productivity and reduce manufacturing cost, then the manufacturing efficiency is improved, but the resistance to internal pressure and axial force deteriorates
Solution Approach 1:
The optimal bottom geometry (dome curvature, lower ring dimensions, concave deformation positions) is predetermined through design before manufacturing. This preliminary optimization of the geometric parameters ensures that the forming process requires less material and fewer processing steps while still achieving the required mechanical performance, thereby improving manufacturing efficiency without sacrificing strength.
Data Source
AI summary
The invention relates to a beverage can on the basis of an aluminum alloy, preferably for a carbonated drink, comprising:a body (6) having a cylindrical shape and an outer diameter D1;a concave dome-shaped bottom (1) having a depth H1 at its center, an outer diameter D3 and a rectilinear part (2) having a height H3;a convex lower ring (7) having a stand diameter D2 and a flat surface with a width L2;an outer shoulder (5) of radius R1;a shime (4) connecting the outer shoulder (5) and the lower ring (7).The invention is characterized in that the thickness of the sheet of the dome is from 180 to 230 μm, preferably from 190 to 220 μm;and in that the outer diameter D3 of the concave dome (1) is from 36 to 44 mm, preferably from 37 to 43 mm;and in that the width of the lower ring L4 is from 3 to 4.5 mm, preferably from 3.3 to 4 mm;and in that the lower ring has concave deformations (8) which are distributed at regular intervals along the lower ring (7).