Endless Gasket Molding Die With Intermediary Flow Paths
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Solution Overview
Problem
Conventional molding dies for forming endless-shaped gaskets on plate-like base materials often result in gouging, exposing the base material surface and leading to insulation property deterioration.
Innovation Solution
The molding die incorporates first and second intermediate portions with cross-sectional areas equal to or larger than the gate and vent openings, respectively, and a split-typed configuration with three split molds to prevent direct exposure of the base material surface during gasket separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional molding die with direct gate and vent openings to the cavity portion is used, then the molding process is simple, but gouging occurs that exposes the base material surface and deteriorates insulation properties
Solution Approach 1:
The patent introduces intermediate portions between the gate/vent openings and the cavity portion. These intermediate portions act as mediators that receive molding material and gas, then feed them to the cavity portion through controlled pathways. This prevents direct exposure of the base material surface to the gate and vent, thereby suppressing gouging and maintaining insulation properties while adding structural complexity to the molding die.
2Productivity
If the gate opening is directly connected to the cavity portion, then the molding material flows easily, but the base material surface is exposed during gasket separation leading to gouging
Solution Approach 1:
The intermediate portion serves as an intermediary structure that connects the gate opening to the cavity portion. It receives molding material from the gate and feeds it to the cavity through a controlled pathway with cross-sectional area equal to or larger than the gate opening. This maintains efficient material flow while preventing direct connection that would cause gouging during gasket separation, thus improving manufacturing precision without sacrificing productivity.
3Object-generated harmful factors
If the vent opening is directly connected to the cavity portion, then gas discharge is efficient, but unnecessary gas and excess molding material cause gouging during separation
Solution Approach 1:
The intermediate portion connected to the vent opening acts as an intermediary that receives unnecessary gas and excess molding material from the cavity portion. It provides a controlled discharge pathway with sufficient cross-sectional area to maintain efficient gas evacuation while preventing the harmful effects of direct vent connection. This eliminates gouging damage caused by excess material and gas during gasket separation while preserving gas discharge efficiency.
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 effectively suppresses gouging, thereby maintaining the insulation properties of the base material surface by preventing exposure during gasket separation.
Implementation Method 1
a gate (5) extending toward the cavity portion (4) in the molding die (10) and for introducing a flowable molding material, which is cured to become the elastic material, into the cavity portion (4)
Data Source
AI summary
A molding die for molding, on a surface of a plate-like base material, an endless-shaped gasket made of an elastic material includes a cavity which is formed on the opposing surface opposed to the surface of the base material and corresponds to the shape of the gasket, a gate for introducing a molding material which is cured to become an elastic material, a first intermediate portion connecting a gate opening and the cavity and a cross section along the base surface has an area equal to or larger than an opening area of the gate opening, a vent discharging gas unnecessary for molding, and a second intermediate portion connecting an opening on the cavity portion side of the vent extending along the base surface and the cavity and a cross section along the base surface has a cross-sectional area equal to or larger than an area of the gate opening.