Tire Forming-Mold Dual Vent Design for Air Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tire forming-molds with only through-hole vents face issues with rubber flowing outside and hardening, leading to lumps and increased cleaning effort, while molds with non-through-hole vents experience sticky rubber after vulcanization due to trapped air, impairing productivity.
Innovation Solution
A tire forming-mold design incorporating both non-through-hole and through-hole vents, where the through-hole vent has a larger capacity and is positioned differently, allowing air to be discharged effectively and preventing rubber from being pushed out, thus reducing stickiness and facilitating easy removal of spews without breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only through-hole vents are provided in the mold, then air can be discharged effectively, but rubber flows outside the mold through the vents and hardens forming lumps that require cleaning
Solution Approach 1:
The vent system is segmented into two distinct types: non-through-hole vents for air discharge and through-hole vents for rubber overflow control. This segmentation allows each vent type to perform its specific function without interfering with the other, resolving the contradiction between air discharge effectiveness and rubber leakage prevention
Solution Approach 2:
Different regions of the mold are assigned different vent characteristics: non-through-hole vents are positioned to discharge air while preventing rubber escape, and through-hole vents are positioned and sized to allow controlled rubber overflow. This local differentiation optimizes each vent's function for its specific location and purpose
2Object-generated harmful factors
If only non-through-hole vents are provided in the mold, then rubber flow is controlled, but air collects inside the vents causing sticky rubber after vulcanization
Solution Approach 1:
The vent system separates air discharge function (non-through-hole vents) from rubber flow control function (through-hole vents). This segmentation ensures that air can be discharged effectively through non-through-hole vents while through-hole vents provide controlled rubber overflow paths, eliminating both air collection and uncontrolled rubber flow
Solution Approach 2:
The through-hole vents act as intermediary elements that provide a controlled path for rubber overflow, preventing rubber from being forced through the non-through-hole vents. This intermediary structure resolves the conflict between air discharge effectiveness and rubber flow control
3Object-generated harmful factors
If through-hole vents have small capacity, then rubber overflow is minimized, but air discharge is insufficient leading to air collection
Solution Approach 1:
The dual vent system segments air discharge and rubber overflow functions into separate vent types. Non-through-hole vents are optimized for air discharge with appropriate capacity, while through-hole vents are optimized for rubber overflow control. This segmentation eliminates the need to compromise between air discharge and rubber overflow requirements in a single vent
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
The solution enables easy removal of spews without breaking and suppresses stickiness on the tire surface, reducing cleaning effort and improving productivity by ensuring complete filling of protrusion-forming recesses without air collection.
Implementation Method 1
vent holes are provided in the mold, air is discharged, and the protrusions are formed
Implementation Method 2
a recess shaped non-through-hole vent, that permits entry of air from the protrusion-forming recesses, is provided at the protrusion-forming recesses in order to suppress air, which is present in the indented shaped protrusion-forming recesses of the mold for molding the protrusions, from collecting during vulcanization
Implementation Method 3
a surface-forming section that contacts a surface of a green tire and embosses a tire outer face
Implementation Method 4
there is an ingress of the rubber of the green tire into the protrusion-forming recess when the surface of the green tire is pressed against the surface-forming section
Data Source
AI summary
In each protrusion-forming recess of a mold, a non-through-hole vent is provided at one end side, and a through-hole vent that is longer than the non-through-hole vent is provided at another end side. When there is an ingress of rubber of a green tire into each protrusion-forming recess, air inside the protrusion-forming recess is discharged through the through-hole vent and the minute amount of air remaining inside escapes to the non-through-hole vent. Each through-hole vent is set with a large capacity, enabling an ingress of rubber into the vent hole that will later become spew to be stopped inside the through-hole vent. Since the volume of air that is trapped inside the protrusion-forming recess is a minute amount, and so the volume of air that escapes into the non-through-hole vent is also a minute amount.