Can Seaming Chuck Control for Lightweight Aluminum Cans
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Solution Overview
Problem
Existing can closing machines struggle to produce high-speed, fluid-tight double seams on reduced-weight aluminum cans without causing damage or seam defects, as they apply excessive force and momentum during the can closing process.
Innovation Solution
A high-speed can closing machine with a rotatable turret and adjustable lower chuck system, including a spring-loaded piston and knockout pad, controls vertical momentum and alignment to maintain centered engagement of can bodies and lids, using seaming rolls to form a continuous double seam while minimizing force and momentum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing can closing machines operate at high speeds to close standard cans, then productivity is improved, but the applied force and momentum cause damage to reduced-weight cans
Solution Approach 1:
The lower chuck is designed with a spring-loaded piston that provides dynamic, controlled upward movement rather than rigid fixed positioning. This dynamic system adjusts the movement characteristics to reduce vertical momentum and applied force during the can closing operation, preventing damage to reduced-weight cans while maintaining high-speed operation capability
Solution Approach 2:
The invention changes the physical parameters of the lower chuck system by introducing a spring mechanism that modifies the force and momentum characteristics. The spring constant and pre-load are optimized to provide sufficient support for can acceleration while limiting maximum force to prevent damage, enabling high-speed operation on delicate reduced-weight cans
2Productivity
If existing can closing machines apply high force to accomplish can closing operations at high speed, then productivity is improved, but manufacturing precision deteriorates due to seam defects
Solution Approach 1:
The spring-loaded lower chuck creates a dynamic force application system that controls the rate and magnitude of force during seam formation. This prevents excessive force that would cause seam defects while maintaining sufficient force for proper sealing, enabling high-speed operation with acceptable seam quality on reduced-weight cans
Solution Approach 2:
The spring mechanism acts as a cushioning element that absorbs and moderates the impact forces during can closing. By providing this beforehand cushioning, the system prevents sudden excessive forces that would damage the can or create seam defects, allowing high-speed operation without compromising seam quality
3Device complexity
If the lower chuck has fixed vertical position, then device complexity is reduced, but the ability to control vertical momentum is lost causing can damage
Solution Approach 1:
The lower chuck transitions from a static fixed-position design to a dynamic spring-loaded system. This adds moderate complexity but provides essential control over vertical momentum and force application, preventing can damage while enabling high-speed operation on reduced-weight cans
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
The machine effectively produces fluid-tight double seams on both standard and reduced-weight aluminum cans at high speeds, reducing the risk of damage and seam defects by controlling vertical momentum and alignment, thus maintaining operational efficiency and product integrity.
Implementation Method 1
The lower chuck includes a spring loaded vertically movable piston that is in operative connection with the can supporting platform
Implementation Method 2
the seaming rolls are operative responsive to rotation of the can body and lid to produce a continuous double seam which joins the can body and lid in fluid tight relation
Data Source
AI summary
A can closing machine (10) is operative to close standard gauge aluminum cans as well as lighter, weight reduced cans which have a lower column strength. Exemplary arrangements include a can closing machine that includes a turret (12) with a plurality of angularly spaced can closing stations (16). Each can closing station includes a lower chuck (44, 172) and an upper chuck (54). Can seaming rolls are operative to produce a continuous double seam (70) that join a can body (50) and a can lid (56) in sealed fluid tight relation. The machine is operative to precisely control the vertical velocity, position and momentum of the lower chuck and the can components supported thereon when engaging the upper chuck to reduce the risk of damage to can bodies and producing defective seams.