Vulcanizing Mold End Strip Pattern Segmentation for Noise and Strength
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Solution Overview
Problem
Existing tire moulds struggle to reduce rolling noise while maintaining robustness, as increasing pattern density makes segments fragile during handling.
Innovation Solution
The mould design features end strips with varying pattern widths, grouping narrower patterns to strengthen segments and limiting the number of segments per strip, along with specific protrusion orientations in intermediate strips to enhance noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the number of patterns in circumferential strips is increased to improve acoustic performance, then rolling noise reduction is improved, but the width of patterns decreases making segments more fragile and prone to damage during handling
Solution Approach 1:
The moulding surface is divided into multiple circumferential strips, each containing multiple patterns derived from a basic pattern. This segmentation allows the complex tread design to be broken down into manageable segments that can be manufactured and assembled separately, maintaining robustness while achieving noise reduction through the overall pattern distribution.
Solution Approach 2:
Different circumferential strips have different numbers of patterns (first strip has n patterns, second strip has m patterns where m≠n). This local variation in pattern density creates different acoustic characteristics in different regions of the tire tread, improving overall noise reduction performance while allowing each local region to be optimized independently for segment strength.
2Object-affected harmful factors
If pattern width is decreased to increase pattern density for better noise reduction, then acoustic performance is improved, but segment fragility increases during handling
Solution Approach 1:
The mould allows for variable pattern configurations where the number of patterns can be adjusted in different circumferential strips. This dynamic approach enables optimization of pattern density for noise reduction in specific regions while maintaining larger pattern widths and stronger segments in other regions where structural integrity is prioritized.
Solution Approach 2:
The invention changes the parameter of pattern count from a uniform value across all strips to variable values (n and m) for different strips. This parameter variation allows the system to achieve high pattern density where needed for noise reduction while maintaining lower density with stronger segments in other areas, thus resolving the contradiction between noise reduction and segment durability.
Data Source
AI summary
A vulcanizing mold for molding and vulcanizing a tire, comprising a molding surface extending circumferentially in the mold, and comprising two end strips of patterns arranged respectively close to two edges of the molding surface and at least one intermediate strip of patterns positioned between the two end strips of patterns. At least one end strip comprises patterns belonging to a first pattern type and the patterns of the first pattern type have a width which is less than the width of the patterns belonging to the other pattern types of the end strip, and the patterns of the first pattern type are grouped at least in twos on first segments of the mold. The patterns of the end strip not belonging to the first pattern type belong to second segments, each second segment comprising just one pattern of the said end strip.