Segmented Tire Mold Release Using Cam-Driven Extrusion Members
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Solution Overview
Problem
Conventional tire molds require significant driving force to release segments from the tread molding part due to simultaneous peeling of the tread design surface, leading to high initial mold releasing resistance.
Innovation Solution
The mold is designed with extrusion members that protrude from the tread design surface during opening, using a cam mechanism to sequentially release the tire from the tread molding part, reducing the required driving force by pressing the tread with these members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If all portions of the tread design surface are peeled off simultaneously during mold releasing, then the tire can be released from the tread molding part, but a great driving force is required in the initial stage of mold releasing
Solution Approach 1:
The tread molding part is divided into multiple segments arranged in the circumferential direction, allowing the tire to be released in sequential portions rather than all at once. Each segment can be moved independently to peel off the tread design surface progressively, reducing the simultaneous peeling force required.
Solution Approach 2:
An extrusion member protrudes from the tread design surface before the segment movement begins, pressing the tire tread in advance. This preliminary pressing action creates initial separation between the tire and mold surface, reducing the force needed for subsequent segment movement and tread peeling.
2Reliability
If the tread design surface is peeled off simultaneously, then complete tire release is achieved, but the required driving force increases device complexity and cost
Solution Approach 1:
The mold is segmented into multiple independent sections that can move separately. This segmentation allows progressive tire release while maintaining structural simplicity within each segment, avoiding the need for complex centralized release mechanisms.
Solution Approach 2:
The extrusion member automatically presses the tire tread as the segment begins to move, utilizing the segment's own movement to activate the pressing action. This self-service mechanism reduces the need for additional actuators or complex control systems.
3Reliability
If the tread design surface is peeled off simultaneously, then tire release is achieved, but residual strain in the tire increases
Solution Approach 1:
The extrusion member presses the tire tread in advance before complete segment movement occurs. This preliminary pressing gradually separates the tire from the mold surface, allowing stress to be released progressively rather than abruptly, thereby minimizing residual strain in the tire structure.
Solution Approach 2:
By dividing the release process into multiple sequential segment movements, the tire is released in controlled portions. This gradual release prevents sudden stress changes that would cause residual strain, while still achieving complete tire detachment.
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 design reduces the initial mold releasing force, allowing for a smaller production device, lower costs, and minimizes residual strain in the tire, improving its performance.
Implementation Method 1
a cam member which is fixed to the outer ring and abuts a rear end of the extrusion member and when the outer ring is moved in a direction of the axis relatively to the segment, drives the extrusion member in a direction to be protruded from the tread design surface
Data Source
AI summary
Provided are a mold for forming a tire (1) including an annular tread molding part (20) which is configured to be opened and closed by moving a plurality of segments (21) in a radial direction, and a tire production method using the same. In the mold for forming the tire (1), each of the segment (21) includes an extrusion member (30) which protrudes from a tread design surface (20c) for forming a tread (2c) of the tire (2) when the tread molding part (20) is opened after vulcanization molding of the tire (1) to press the tread (2c) of the tire (2) after the vulcanization molding.