Annular Seal Joint Molding to Prevent Core Protrusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing manufacturing methods for annular seal materials with a core and outer layer face challenges such as cracking of the outer layer and protrusion of the core in joint portions, leading to high production costs and complexity.
Innovation Solution
A method involving the use of rope-like preforms made from crosslinkable rubber compositions, where a preforming step is followed by two hot pressing steps to create an annular seal material with a core and outer layer, ensuring a stable joint portion and preventing core protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer layer portion is inflated during molding, then the outer layer can cover the core material, but the outer layer portion material may break
Solution Approach 1:
The outer layer portion is pre-formed into a string shape with appropriate dimensions before molding. This preliminary shaping ensures that the outer layer has the correct geometry to cover the core material without requiring excessive inflation during molding, thereby preventing material breakage while achieving complete coverage.
2Strength
If a connecting member is disposed at the seam, then the joint can be strengthened, but the layer configuration at the seam does not have a two-layer structure
Solution Approach 1:
The connecting member is integrated with the core material to form a unified joint structure. The connecting member and core material are positioned and bonded together before final molding, creating a seamless joint that maintains the two-layer structure throughout while providing enhanced joint strength through the combined geometry of the connecting member and core.
3Manufacturing precision
If the core material is inserted into the cavity before molding, then the outer layer can be formed around it, but the core material may protrude from the gap between the upper and lower outer layers
Solution Approach 1:
The core material is pre-positioned within the cavity with的定位 structures or support elements that prevent upward movement during molding. These preliminary positioning measures counteract the tendency of the core material to protrude, ensuring it remains properly positioned while the outer layer forms uniformly around it.
4Ease of manufacture
If the outer layer material is formed into a ribbon and wound around the core, then the outer layer can be applied, but wrinkles occur in the curved portion and feeding becomes difficult
Solution Approach 1:
The outer layer material is supplied as a pre-formed string with optimized cross-sectional dimensions and flexibility parameters. This parameter optimization allows the material to be directly positioned and molded around the core without requiring winding operations, thereby eliminating wrinkle formation while maintaining ease of application through the string's inherent flexibility and dimensional stability.
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 method effectively suppresses cracking of the outer layer and protrusion of the core in the joint portion, enabling mass production of annular seal materials at a lower cost while maintaining material integrity.
Implementation Method 1
a preforming step of providing one or two or more rope-like preforms comprising an uncrosslinked core made of a crosslinkable rubber composition for a core, and an uncrosslinked outer layer, made of a crosslinkable rubber composition for an outer layer, covering a periphery of the uncrosslinked core; a first hot pressing step of placing the rope-like preform in a first mold to hot press mold a portion other than end portions of the rope-like preform; and a second hot pressing step of contacting two end portions of the rope-like preform with each other and placing the same in a second mold to carry out hot press molding
Implementation Method 2
an uncrosslinked core made of a crosslinkable rubber composition for a core, and an uncrosslinked outer layer, made of a crosslinkable rubber composition for an outer layer
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3a~3b
AI summary
The present invention relates to a method for manufacturing an annular seal material comprising a core and an outer layer covering a periphery of the core, comprising: a preforming step of providing one or two or more rope-like preforms comprising an uncrosslinked core made of a crosslinkable rubber composition for a core, and an uncrosslinked outer layer, made of a crosslinkable rubber composition for an outer layer, covering a periphery of the uncrosslinked core; a first hot pressing step of placing the rope-like preform in a first mold to hot press mold a portion other than end portions of the rope-like preform; and a second hot pressing step of contacting two end portions of the rope-like preform with each other and placing the same in a second mold to carry out hot press molding, in presented order. According to the present invention, provided is a manufacturing method that can mass-produce an annular seal material constituted of a core and an outer layer at low cost.