Bead Core Positioning in Tire Manufacturing
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Solution Overview
Problem
Existing tire manufacturing processes struggle to maintain the desired concentricity between the bead core and the forming support due to insufficient anchoring, leading to potential movement of the bead core under stress during the turning up of the carcass ply.
Innovation Solution
A process and apparatus where a bead core positioning device retains the bead core in contact with the carcass ply during the initial part of the turning up process, increasing the anchoring surface and ensuring concentricity, followed by adherence through rubber stickiness in the subsequent steps, preventing undesired movement under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bead core is retained only by rubber stickiness during the turning up process, then the manufacturing process is simple, but the bead core moves under stress leading to loss of concentricity
Solution Approach 1:
The bead core positioning device performs preliminary action by retaining the bead core in contact with the carcass ply before and during the initial part of the turning up process. This preliminary positioning ensures concentricity is established before stress is applied, preventing subsequent movement that would occur if only rubber stickiness were used.
Solution Approach 2:
The bead core positioning device acts as an intermediary between the bead core and the forming support, providing mechanical retention during critical phases of the process. This intermediary device bridges the gap between the need for simple rubber stickiness and the need for precise concentricity maintenance under stress.
2Reliability
If the bead core is retained only by rubber stickiness, then the device complexity is low, but the reliability of maintaining bead core position under stress is insufficient
Solution Approach 1:
The positioning device performs preliminary retention of the bead core during the turning up process, establishing reliable positioning before stress is applied. This preliminary action ensures the bead core maintains its desired position throughout the manufacturing process, significantly improving reliability compared to relying solely on rubber stickiness.
Solution Approach 2:
The bead core positioning device serves as a reliable intermediary mechanism that mechanically retains the bead core during critical phases. This intermediary provides dependable position retention under stress conditions where rubber stickiness alone would fail, enhancing overall system reliability.
3Manufacturing precision
If a bead core positioning device is used to retain the bead core during turning up, then concentricity is maintained, but the device complexity increases
Solution Approach 1:
The positioning device performs preliminary retention of the bead core during the turning up process, establishing concentricity before stress is applied. This preliminary positioning action ensures the bead core maintains its desired position throughout manufacturing, achieving high precision despite the added device complexity.
Solution Approach 2:
The bead core positioning device acts as an intermediary mechanism that bridges the gap between simple manufacturing processes and precision requirements. By providing mechanical retention during critical phases, it enables high concentricity maintenance while keeping the overall system architecture manageable.
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
This approach ensures the bead core remains in its desired position throughout the tire manufacturing process, enhancing the quality and performance of the tire by maintaining concentricity and preventing movement due to stress, thus ensuring consistent tire quality across different radial dimensions.
Implementation Method 1
the retaining into position of the bead core on the end edge of the carcass ply while turning up the free end portion of the carcass ply is only due to the stickiness of the rubber mixture of the bead core with the rubber mixture of the fabric by which the carcass ply is made
Data Source
AI summary
A process for manufacturing a tire for vehicle wheels, includes building, on a forming support extending about an axis, a carcass structure including at least one carcass ply and, at at least one end edge of the at least one carcass ply, at least one annular anchoring structure. Building the carcass structure includes laying the carcass ply on the forming support, bringing the annular anchoring structure in contact position with the end edge of the carcass ply and turning up the end edge about the annular anchoring structure so as to form a turned up end portion of the carcass ply including the annular anchoring structure. A first part of turning up the end edge of the carcass ply is carried out while at least one positioning device retains the annular anchoring structure in contact position with the end edge of the carcass ply.