Seal Molding Pressure Control via Air Vent Reservoir
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Solution Overview
Problem
Conventional methods for manufacturing seal components in fuel batteries face challenges in maintaining proper molding pressure, leading to defective molding and the formation of thin burrs due to air vent issues and uneven material distribution.
Innovation Solution
A method involving a metal mold with an air vent hole and a surplus material reservoir, where the molding rubber material flows into the air vent hole and then into the reservoir, causing a pressure drop to maintain optimal molding pressure within the cavity, preventing leakage and burr formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid molding rubber material is charged into the cavity to fill it completely, then the molding precision is improved, but the molding pressure becomes unstable due to air vent issues and material confluence
Solution Approach 1:
The air vent hole acts as an intermediary component that mediates between the molding rubber material flow and the cavity pressure. It provides a controlled path for air and volatile gas escape while regulating material flow, preventing uncontrolled pressure spikes and ensuring stable molding pressure throughout the process
Solution Approach 2:
The air vent hole is pre-positioned at the confluence position where molding rubber material from multiple gates converges. This preliminary placement ensures that air and volatile gases are evacuated before the material confluence occurs, preventing defects and maintaining pressure stability from the outset of the molding process
2Reliability
If the molding rubber material flows into the air vent hole to evacuate air and volatile gas, then the reliability of molding is improved, but the molding pressure drops due to material loss
Solution Approach 1:
The air vent hole is specifically positioned at the confluence position where molding rubber material from multiple gates converges. This localized placement ensures that air and volatile gases are evacuated precisely where they accumulate during material flow, maintaining reliability without excessive material loss
Solution Approach 2:
The air vent hole replicates the function of a traditional vent while being integrated into the molding cavity structure. It serves both as an air evacuation path and as a pressure regulation mechanism, copying the essential venting function while adding pressure stabilization capabilities
3Manufacturing precision
If the cavity pressure is increased to prevent defective molding, then the manufacturing precision is improved, but the rubber material leaks along the contact surfaces forming thin burrs
Solution Approach 1:
The air vent hole provides real-time feedback on the molding pressure status by allowing controlled material flow through it. When pressure becomes excessive, the material flow through the air vent hole increases, automatically regulating pressure and preventing burr formation without requiring external pressure control mechanisms
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 approach ensures consistent molding pressure, preventing defective molding and burr formation, while allowing for easy verification of proper molding by checking the rubber material in the reservoir, thus enhancing the physical properties and dimensions of the gasket.
Implementation Method 1
causing a pressure drop to maintain optimal molding pressure within the cavity
Data Source
AI summary
To prevent defective molding, a base member is set between split molds of a metal mold, a molding rubber material is injected into an endless shape cavity defined between the base member and the split mold, an injection amount thereof is made such that the molding rubber material fills the cavity and thereafter flows from an air vent hole open to a confluence position in the cavity into a surplus material reservoir provided downstream but does not fill the surplus material reservoir, pressure drop due to flow resistance is caused to the molding rubber material flowing into the surplus material reservoir, and thereby pressure in the cavity is maintained to be not lower than pressure required to mold a gasket and lower than pressure causing leakage from the cavity.