Tire Belt Layer Bonding Margin Control via Rigid Core Rotation
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Solution Overview
Problem
The variation in circumferential length of the outer circumferential surface of a rigid core in the width direction causes bonding disorder between strip materials in the tire's belt layer, leading to inconsistent bonding margins and quality issues in tire manufacturing.
Innovation Solution
A method where strip materials are bonded to the molding surface in a longitudinal direction while rotating the rigid core to adjust the circumferential angle, ensuring consistent bonding margins by moving the molding surface close to the strip materials and extending them in the longitudinal direction, thereby reducing overlap and gaps between adjacent strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strip materials are sequentially arranged and bonded to the outer circumferential surface of a rigid core with varying circumferential length, then the belt layer is formed, but bonding disorder occurs between adjacent strip materials due to variation in bonding margin
Solution Approach 1:
The patent applies the dynamics principle by making the rigid core rotatable to change its circumferential length dynamically. The control unit rotates the rigid core in the direction that reduces circumferential length when bonding margin becomes excessively large, and rotates it in the opposite direction when bonding margin becomes excessively small. This dynamic adjustment of the rigid core's circumferential dimensions allows for consistent bonding margins between adjacent strip materials despite the core's initially varying profile, thereby resolving the contradiction between manufacturing precision and operational simplicity.
2Shape
If the rigid core has a profile with varying circumferential length in the width direction, then the tire's belt layer can accommodate the tire's profile, but bonding disorder occurs between adjacent strip materials
Solution Approach 1:
The patent applies the parameter changes principle by dynamically altering the circumferential length parameter of the rigid core through rotation. The control unit monitors the bonding margin between adjacent strip materials and rotates the rigid core to adjust its circumferential length accordingly. This parameter adjustment maintains consistent bonding margins while preserving the rigid core's profile shape that adapts to the tire's geometry, thus resolving the contradiction between shape adaptation and bonding uniformity.
3Ease of manufacture
If strip materials are bonded while the rigid core is stationary, then the bonding process is simple, but excessive overlap or gaps occur between adjacent strip materials
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary rigid core into a rotatable one controlled by a control unit. During the bonding process, the control unit rotates the rigid core to adjust its circumferential length in real-time, preventing excessive overlap or gaps between adjacent strip materials. This dynamic control mechanism maintains bonding margin precision without significantly complicating the overall bonding process, as the rotation is automatically controlled based on monitored bonding margin conditions.
Data Source
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AI summary
Provided is a method for manufacturing a tire which, when forming a belt layer by bonding strip materials adjacent in the circumferential direction on the molding surface located on the outer circumferential side of the rigid core, suppresses bonding disorder between the strip materials due to the circumferential length of the outer circumferential surface of the rigid core that varies due to a position of the rigid core in the width direction. Along the profile in the width direction of a outer circumferential surface 2b of the rigid core 2 that is preliminarily known, the rigid core 2 is relatively moved so that the molding surface 14a is brought close to the strip material 16 to be bonded, and the strip material is bonded to the molding surface 14a in a manner of extending in the longitudinal direction while relatively rotating the rigid core 2 in a direction in which the circumferential angle of the rigid core 2 with respect to the longitudinal direction of the strip material 16 changes, so that variation in the bonding margin, due to the position of the rigid core 2 in the width direction, between strip materials 16 that have been adjacently bonded to the molding surface 14a in the circumferential direction is reduced.