Can Bottom Dome Structure for Higher Pressure Resistance
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Solution Overview
Problem
Existing can container designs face limitations in achieving higher pressure resistance strength due to constraints in roll-forming processes, which also lead to aesthetic issues such as blackening of the surface from oxide film destruction.
Innovation Solution
A can container design featuring a dome part and annular convex part with a recessed inner peripheral surface that allows deeper concavity and compressive deformation, avoiding roll-forming traces and maintaining aesthetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If roll-forming is used to create the first concave curved surface part, then the manufacturing process is simple and efficient, but the radius of curvature is limited and the inner peripheral surface cannot be concaved deeper toward the outside
Solution Approach 1:
The patent replaces the roll-forming mechanical system with a stamping system. Instead of using a rolling tool to form the first concave curved surface part, a stamping tool is used to directly stamp and form the deeper concave shape on the can bottom. This substitution allows for greater design freedom in the curvature radius and deeper concavity without being constrained by the mechanical limitations of roll-forming equipment.
2Strength
If the inner peripheral surface is concaved deeper toward the outside to increase pressure resistance, then the pressure resistance strength improves, but the distance between the center of radius of curvature and nose part cannot be increased due to roll interference
Solution Approach 1:
The patent eliminates the forming tool interference problem by replacing the roll-forming process with a stamping process. The stamping tool can directly apply force to create the desired deep concave shape without the physical interference that occurs with rolling tools. This allows the distance between the center of radius of curvature and the nose part to be increased, thereby improving pressure resistance strength without encountering device complexity issues.
3Strength
If roll-forming is used to achieve deeper concavity, then the pressure resistance strength increases, but the oxide film is destroyed causing blackening and aesthetic deterioration
Solution Approach 1:
The patent substitutes the roll-forming process with a stamping process to avoid oxide film destruction. The stamping method applies compressive force directly to form the concave shape without the rubbing and friction inherent in roll-forming, thereby preserving the oxide film on the aluminum alloy surface. This maintains the aesthetic appearance of the product while still achieving the desired deeper concavity and improved pressure resistance strength.
Data Source
AI summary
To provide a can container to achieve a higher pressure resistance strength by improving the shape of the bottom part of the can container. The can container includes a can barrel and a can bottom, the can bottom provided with, in a center thereof, a dome part concaved toward the inside of the can container along the can axis direction, and an annular convex part projecting toward the outside of the can container to shape an annular support part in an outer periphery of the dome part, wherein an inner peripheral surface extending from the support part of the annular convex part to an outer peripheral edge part of the dome part includes a recessed part where the outer peripheral edge part of the dome part is positioned in a direction of being farther away from the can axis than an innermost part of the inner peripheral surface.