Pneumatic Tire Building Drum Bellows for Bead-Core Uniformity
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Solution Overview
Problem
Existing tire manufacturing methods struggle to produce uniform pneumatic tires with minimal length differences and uniform mechanical stress around the bead cores, especially when using high-stiffness carcass plies, leading to increased reject rates and reduced economic efficiency.
Innovation Solution
A method involving the axial movement of bellows on a tire-building drum to detach and reposition the inner layer and carcass ply relative to the bead cores, combined with synchronous bellows movement and electric motor control, ensures uniform tension and adhesion, reducing length differences and enhancing uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carcass plies with higher stiffness are used, then tire strength and durability are improved, but length differences between inner layer and carcass ply increase, reducing manufacturing precision
Solution Approach 1:
The bellows are moved axially in a synchronous manner to dynamically adjust the positioning of the inner layer and carcass ply during manufacturing. This dynamic adjustment compensates for length differences caused by high-stiffness carcass plies, ensuring uniform tension and reducing length variations between bead cores while maintaining tire strength.
2Manufacturing precision
If complex methods are used to achieve high uniformity, then manufacturing precision is improved, but device complexity and cycle time increase, reducing productivity
Solution Approach 1:
The invention changes the parameter of bellows axial position to control the positioning of tire layers. By moving the bellows axially to synchronous positions, the system achieves high uniformity through a simple parameter adjustment rather than complex mechanical interventions, thereby maintaining productivity while improving manufacturing precision.
3Manufacturing precision
If the bellows are moved axially to detach and reposition layers, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The bellows structure serves multiple functions: it provides structural support for the tire layers and simultaneously acts as a positioning mechanism through its axial movement. This multi-functionality reduces the need for separate positioning devices, thereby improving manufacturing precision without proportionally increasing 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 method achieves uniformity in tire construction by minimizing length variations and mechanical stress, thereby improving production efficiency and reducing cycle time.
Implementation Method 1
a) Placing the inner layer and the carcass ply onto a tire building drum and on both sides onto a support ring arranged axially to the tire building drum, each ring having a bellows, b) Moving the bellows axially to increase the distance to the tire building drum, c) Moving the bellows axially to decrease the distance to the tire building drum
Implementation Method 2
The adhesion of the inner layer to the tire building drum prevents it from moving towards the drum during the synchronous movement of the bellows, thus creating a particularly symmetrical contact surface independent of the bellows
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method, a device and a computer program product for manufacturing a pneumatic tire with an inner layer (2), a carcass layer (3), a bead core, a tire belt and a tread.