Can Thread Forming Assembly for Thin-Wall Resealable Closures
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Solution Overview
Problem
Existing thread forming devices for metallic beverage containers face challenges in creating resealable threaded closures due to the thinness of aluminum can bodies, which compromises strength and are not cost-effective for high-speed manufacturing.
Innovation Solution
A thread forming apparatus comprising a punch assembly and a die assembly that utilize actuators to move radially and axially, forming internal threads on the can body through a punch projection and die recess, enabling high-throughput manufacturing of resealable metallic beverage containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If threads are created in the can body to enable resealability, then the functional capability is improved, but the structural strength deteriorates due to the thinness of aluminum
Solution Approach 1:
The thread forming process applies localized deformation only to the specific region where threads are needed (the rim area), while the rest of the thin aluminum can body remains unchanged. This localized approach creates the necessary threading functionality without compromising the overall structural integrity of the can body.
Solution Approach 2:
The threading operation is performed as a preliminary step before the can is filled and sealed. By forming threads in advance on the rim area, the can body is prepared for future resealing operations without requiring additional modifications later, thus enabling adaptability while maintaining strength through controlled initial deformation.
2Ease of manufacture
If traditional thread forming methods are used, then the manufacturing process is simple, but the production speed is too slow for high-volume manufacturing
Solution Approach 1:
The thread forming apparatus uses periodic reciprocating motion of the punch and die assemblies, driven by cam mechanisms, to rapidly form threads. The periodic engagement and disengagement of the forming elements allows for high-speed cyclic operation, transforming a traditionally slow process into a high-throughput manufacturing operation capable of keeping pace with modern can production rates.
Solution Approach 2:
The apparatus employs dynamic cam-driven mechanisms that convert rotational motion into controlled radial and axial movements of the punch and die. This dynamic system allows for rapid positioning and forming actions, significantly increasing production speed while maintaining the relative simplicity of the manufacturing process through mechanical automation.
3Manufacturing precision
If the punch and die move radially to form threads, then the thread formation precision is improved, but the device complexity increases
Solution Approach 1:
Cam mechanisms serve as intermediary elements that translate simple rotational or linear actuator motion into precise radial movements of the punch and die. These cam intermediaries provide controlled, repeatable motion paths that ensure accurate thread formation geometry without requiring complex direct positioning systems, thus achieving precision while managing device complexity.
Solution Approach 2:
The apparatus controls punch and die movements in multiple dimensions (radial direction for thread depth, axial direction for positioning) using coordinated cam mechanisms. By adding dimensional control through cam profiles rather than complex multi-axis positioning systems, the invention achieves precise thread formation with moderate device complexity.
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 apparatus achieves high-speed thread formation with increased throughput, allowing for efficient production of resealable cans that meet customer demands and are environmentally friendly.
Implementation Method 1
the punch projection is structured to deform the portion of the sidewall of the can body into the die recess in a manner which forms the thread
Data Source
AI summary
A thread forming apparatus includes a punch assembly having a punch cam and a punch. The punch includes a body having a first end engaged with the punch cam and a second end having a projection moved radially in response to engagement with the punch cam. The apparatus further includes a die assembly adjacent the punch assembly and defining a clearance therebetween to receive a portion of a sidewall of a can body. The die assembly includes a die cam and a die including a top portion having a die recess and a bottom portion engaged with the die cam, the die being moved radially in response to engagement with the die cam. The projection is structured to deform the portion of the sidewall of the can body into the die recess in a manner which forms the thread.