Pneumatic Tire Green Tire Positioning via Bladder Device
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Solution Overview
Problem
Conventional methods for manufacturing pneumatic tires face challenges in precisely positioning the green tire within the mold attached to a vulcanization device, affecting the uniformity of the final product due to spatial restrictions and lack of precise confirmation of the tire's position.
Innovation Solution
A system involving a bladder device with a central shaft and positioning sensors aligns the green tire with the vulcanization bladder outside the mold, allowing for high-precision positioning and inflation to support the tire, ensuring accurate placement and uniform vulcanization within the mold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the green tire is placed in the mold using conventional methods, then the manufacturing process can proceed, but the positioning precision of the green tire in the mold is insufficient, affecting the uniformity of the manufactured pneumatic tire
Solution Approach 1:
A positioning member is introduced as an intermediary between the green tire and the mold. This positioning member includes a positioning protrusion that fits into a positioning groove on the mold, providing a precise reference point for positioning the green tire. The positioning member acts as a mediator that transfers and maintains the precise positional relationship from the building drum to the mold, solving the positioning precision problem without requiring complex adjustment mechanisms.
Solution Approach 2:
The positioning member is attached to the building drum before the green tire is formed and transferred. This preliminary attachment ensures that the positioning reference is already in place during tire formation. When the green tire is transferred to the mold, the pre-positioned positioning member automatically guides the tire into the correct position, eliminating the need for complex positioning operations at the mold stage.
2Manufacturing precision
If spatial restrictions in the vulcanization device are considered, then the device design is constrained, but precision positioning of the green tire becomes difficult to achieve and confirm
Solution Approach 1:
The positioning member serves as a visible and tangible intermediary that makes positioning confirmation straightforward. The positioning protrusion and groove provide a clear mechanical interface that can be easily observed and verified. This simple mechanical indication system allows operators to quickly confirm proper positioning without complex measurement devices, addressing the ease of operation requirement while maintaining high precision.
Solution Approach 2:
The positioning member is designed to automatically guide the green tire into the correct position through its geometric features (protrusion and groove). This self-guiding mechanism eliminates the need for external positioning aids or complex alignment procedures. The system performs its own positioning function through the inherent geometry of the positioning member, making the process both precise and easy to operate.
3Productivity
If the green tire is transported to the vulcanization device without precise positioning, then the transport process is simple, but the uniformity of the manufactured pneumatic tire is adversely affected
Solution Approach 1:
The positioning member is attached to the building drum in advance, establishing the precise positional relationship between the green tire and the building drum before transport. This preliminary positioning ensures that when the green tire is transported to the vulcanization device, it maintains its precise position relative to the mold, achieving both efficient transport and high manufacturing precision.
Solution Approach 2:
The positioning member acts as a stable intermediary that maintains the positional relationship during transport. The rigid connection between the positioning member and both the building drum (via attachment) and the mold (via engagement) creates a stable reference frame that preserves positioning accuracy throughout the transport process, ensuring uniformity of the final product.
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 method enables the precise positioning of the green tire within the mold, resulting in superior uniformity and productivity gains by reducing the time required for vulcanization and preventing shape deformations, while improving tire manufacturing efficiency.
Implementation Method 1
the vulcanization bladder is inflated to a predetermined green tire supportable internal pressure to bring the vulcanization bladder into contact with the inner surface of the green tire and support the green tire as such
Data Source
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AI summary
A method of manufacturing a pneumatic tire and a system for manufacturing a pneumatic tire capable of placing a green tire in a mold attached to a vulcanization device with high precision. The method includes placing a bladder device (1) including a vulcanization bladder (2) at a holding position outside a mold (13); inserting the vulcanization bladder (2) in a green tire (G) with a tire axis central position of the green tire (G) and a shaft central position of the vulcanization bladder (2) aligned, and aligning a central position in a tire width direction of the green tire (G) and a central position in a shaft direction of the vulcanization bladder (2); in a state positioned as such, supporting the green tire (G) with the vulcanization bladder (2) by inflating the vulcanization bladder (2) to a predetermined green tire supportable internal pressure and bringing the vulcanization bladder (2) in contact with an inner surface of the green tire (G); transporting the green tire (G) together with the bladder device (1) to the vulcanization device (11) and setting the green tire (G) together with the bladder device (1) in the mold (13); inflating the vulcanization bladder (2) to a predetermined vulcanization internal pressure, which is higher than the predetermined green tire supportable internal pressure; and vulcanizing the green tire (G).