Tire Vulcanizing Method Sidewall Pre-Positioning
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Solution Overview
Problem
Existing tire vulcanizing methods cause wear damage to the mold due to rubbing between the side plate and sector during side plate movement, and result in rubber biting of the green tire, making it difficult to remove the vulcanized tire smoothly.
Innovation Solution
A tire vulcanizing method where the green tire is mounted with side molds moved closer in the tire axial direction to reduce the width between sidewall portions, followed by positioning and then moving the tread mold in the radial direction to prevent rubbing and ensure smooth removal, with the division position between side molds and tread mold within 15% of the tire's cross-sectional height from the maximum width position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the side plate is moved outward in the tire axial direction to move the bead portion to the molding position, then the bead portion can be positioned correctly, but the side plate and sector rub against each other causing wear damage
Solution Approach 1:
The green tire is pre-positioned with the bead portion located on the tire equator side with respect to the molding position before closing the mold. This preliminary positioning allows the bead portion to be correctly placed without requiring subsequent side plate movement that would cause rubbing and wear damage.
Solution Approach 2:
Instead of moving the side plate outward to position the bead portion (which causes rubbing), the invention inverts the approach by pre-positioning the bead portion on the equator side before closing, eliminating the need for problematic side plate movement during the closing process.
2Object-affected harmful factors
If the sectors and side plate are closed before side plate movement to prevent green tire biting, then rubber biting is prevented, but the side plate and sector still rub against each other during subsequent movement
Solution Approach 1:
The bead portion is pre-positioned on the tire equator side with respect to the molding position before the sectors and side plate are closed. This preliminary action ensures correct positioning while allowing the mold components to close without subsequent rubbing movement.
Solution Approach 2:
The invention extracts the problematic side plate movement step from the process by pre-positioning the bead portion before closing, thereby eliminating the source of rubbing and wear damage while maintaining the protective closing sequence.
3Object-affected harmful factors
If the green tire is mounted with side molds moved closer to reduce width between sidewall portions, then the tire width is reduced to prevent rubbing, but additional positioning steps are required
Solution Approach 1:
The side molds are moved closer to each other in the tire axial direction before the green tire is mounted, creating a reduced width configuration. This preliminary action prevents rubber biting during subsequent operations while the additional positioning steps are systematically organized to manage the increased complexity.
Solution Approach 2:
The side molds are made dynamically adjustable, moving closer during mounting to prevent rubbing, then moving to reference positions after mounting. This dynamic adjustment allows the system to adapt to different process stages, suppressing rubber biting while managing process complexity through controlled movement sequences.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A green tire vulcanizing method includes a step S1 of mounting a green tire 50a within a vulcanization mold 2 in a state where the vulcanization mold 2 is opened. The step S1 includes: a step S1c of moving a pair of side molds 5 such that the side molds 5 are closer to each other in a tire axial direction than reference positions P thereof, to reduce a width in the tire axial direction between sidewall portions 52 of the green tire 50a; a step S1d of, after a predetermined time elapses from the step S1c, moving the side molds 5 to the reference positions P thereof and stopping the side molds 5; and a step Sle of, after the step S1d, moving a tread mold 4 in a tire radial direction to position the tread mold 4 at a reference position P thereof.