Tire Vulcanizing Mold Side Segment Clearance Design
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Solution Overview
Problem
The existing tire vulcanizing molds face challenges in accurately providing clearances on the side shaping surface, leading to shaping defects due to dimension errors and assembly errors, which result in either excessive rubber spillage or insufficient air release, causing dents on the tire's outer surface.
Innovation Solution
A tire vulcanizing mold design featuring upper and lower side molds with recesses and pieces that form the side shaping surface, where the pieces are fitted into the recesses to create clearances for air release, with carefully defined dimensions and curved surfaces to ensure accurate air release and prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If plural side segments are arranged in the tire circumferential direction to form the side mold, then air release capability is improved, but manufacturing precision deteriorates due to accumulated dimension errors and assembly errors
Solution Approach 1:
The side mold is divided into multiple side segments arranged in the tire circumferential direction, with each segment containing recesses that form clearances for air release. This segmentation allows air to escape through multiple distributed pathways while maintaining accurate clearance positioning through precise recess design in each segment.
Solution Approach 2:
The recess structure acts as an intermediary element between the side segment and the piece, enabling accurate clearance formation. The recess includes an outer-side inner wall surface, an inner-side inner wall surface, radial inner wall surfaces, and a curved surface that connects them, providing a precise geometric framework that eliminates positioning errors.
Solution Approach 3:
The recess includes a curved surface that connects the outer-side inner wall surface and the radial inner wall surface. This curved surface geometry eliminates sharp corners and provides smooth transitions, improving manufacturing accuracy and ensuring consistent clearance dimensions throughout the mold assembly.
2Reliability
If a piece is fitted into a recess to form the clearance, then assembly error accumulation is reduced, but manufacturing precision deteriorates due to difficulty in accurately forming the inner corner of the recess
Solution Approach 1:
The curved surface in the recess replaces sharp inner corners with smooth transitions. This curvature makes the recess easier to manufacture with high precision, as curved surfaces are more forgiving to machining processes than sharp corners, while still providing the necessary geometric constraints for accurate piece positioning.
Solution Approach 2:
The recess geometry is designed with specific parameters including the curved surface connection between wall surfaces, which changes the manufacturing approach from forming sharp corners to forming smooth transitions. This parameter change improves both manufacturability and positioning accuracy of the piece within the recess.
Data Source
AI summary
A tire vulcanizing mold includes an upper and lower pair of side molds having side shaping surfaces. Each of the side molds includes: a side mold main body including plural recesses, each being opened to corresponding one of the side shaping surfaces at spaced intervals; plural pieces, each of which is fitted into the recess; and clearances provided between the side mold main body and each of the pieces. Each of the recesses includes: an outer-side inner wall surface defining an outer side in a tire radial direction; an inner-side inner wall surface defining an inner side; a pair of radial inner wall surfaces that are located between the outer-side inner wall surface and the inner-side inner wall surface and define one side and the other side in the tire circumferential direction; and a curved surface that connects the outer-side inner wall surface and the radial inner wall surface.