Spiral Forming Alignment Control for Geometric Tolerances
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Solution Overview
Problem
Spiral forming processes in manufacturing are prone to large-scale deformation and failure due to small, accumulating errors in alignment and feed rates, particularly in the formation of conical and cylindrical structures.
Innovation Solution
A method that involves monitoring and adjusting the alignment of edges in a spiral forming process by detecting deviations between edge regions and introducing an out-of-plane gap to correct misalignments, allowing for precise control over geometric tolerances through the use of sensors and actuators to align visual indicia or adjust the relative feed rates of the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous roll-forming is used to create spiral structures, then productivity is improved through continuous manufacturing, but manufacturing precision deteriorates due to accumulating errors in alignment and feed rates
Solution Approach 1:
The patent implements a feedback control system where sensors detect the actual positions of first and second edge regions during continuous roll-forming, and this detection information is fed back to adjust the feeding speeds of individual rolls. The control system modifies feed rates dynamically based on detected deviations from target positions, enabling real-time correction of alignment errors while maintaining continuous production flow.
Solution Approach 2:
The patent introduces dynamic adjustment of feed rates for different rolls during the continuous forming process. Instead of fixed feed rates, the system varies the rotational speeds of individual rolls based on real-time detection of edge region positions. This dynamic control allows the system to compensate for accumulating errors while maintaining continuous operation, resolving the contradiction between productivity and precision.
2Manufacturing precision
If alignment corrections are made during spiral forming, then manufacturing precision is improved through control of geometric tolerances, but device complexity increases due to additional sensors and actuators
Solution Approach 1:
The patent applies alignment control specifically to the critical edge regions where joining occurs, rather than controlling the entire material sheet uniformly. Sensors and actuators are focused on monitoring and adjusting only the first and second edge regions that require precise alignment for joining. This localized approach achieves necessary geometric tolerance control while minimizing the overall complexity of the control system.
Solution Approach 2:
The system uses the material's own geometry and the existing roll-forming mechanism to achieve alignment corrections. The detection system identifies deviations in edge region positions, and the control system utilizes the existing variable speed drives on the rolls to self-correct the alignment without requiring external adjustment mechanisms. This reduces device complexity by leveraging the system's inherent capabilities.
3Reliability
If real-time monitoring and adjustment of edge regions is implemented, then reliability is improved by preventing large-scale deformation, but loss of time increases due to monitoring and adjustment operations
Solution Approach 1:
The patent implements continuous monitoring of edge region positions throughout the spiral forming process, with real-time feedback and adjustment. Sensors continuously track the positions of first and second edge regions, and the control system continuously adjusts feed rates to maintain proper alignment. This continuous action prevents the accumulation of errors that could lead to large-scale deformation, ensuring structural reliability without interrupting the manufacturing process.
Solution Approach 2:
The system performs detection and adjustment operations rapidly during the continuous forming process, effectively skipping over potential problem areas before they can develop into large-scale deformations. By detecting deviations early and making quick adjustments through dynamic feed rate modification, the system prevents error accumulation and maintains reliability without significant time loss.
Data Source
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AI summary
Spiral forming methods can be used to join edges of a rolled material along a spiral joint to form conical and/or cylindrical structures. Alignment of the edges of the rolled material can be controlled in a wrapping direction as the material is being joined along the spiral joint to form the structure. By controlling alignment of the edges of the material as the edges of the material are being joined, small corrections can be made over the course of forming the structure facilitating control over geometric tolerances of the resulting spiral formed structure.