Pipe Joint Insert Molding with Retaining Pin Seal Cooling
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Solution Overview
Problem
In pipe joint manufacturing via insert molding, the seal member can deform and form gaps with the retaining pin due to heating, leading to reduced sealing performance as excess resin adheres to the seal face.
Innovation Solution
A manufacturing method and mold design where the seal member is cooled through a retaining pin with a cooling channel, preventing deformation by controlling the temperature and directing the molten resin flow to avoid direct pressure on the seal member, ensuring it remains stable during resin injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mold is heated (pre-heated) prior to starting to fill the molten resin, then the molten resin can flow smoothly into the mold, but the seal member inside the mold becomes soft due to heating and may deform causing gap formation between the seal member and the retaining pin
Solution Approach 1:
The seal member is pre-cooled through the retaining pin before the mold is heated and before resin filling begins. This preliminary cooling action ensures the seal member remains rigid and maintains its positioning precision even when the mold is subsequently heated for resin filling.
Solution Approach 2:
The cooling action applied to the seal member through the retaining pin creates a preliminary anti-action that counteracts the softening effect of the subsequent mold heating. By pre-cooling the seal member, the system prepares it to resist deformation when exposed to heat during the resin filling process.
2Manufacturing precision
If the seal member is cooled through the retaining pin, then the seal member maintains its shape and prevents gap formation, but additional cooling infrastructure is required
Solution Approach 1:
The retaining pin serves multiple functions: it holds the seal member in position during assembly, acts as a cooling conduit by incorporating cooling channels through which coolant flows, and provides structural support during the molding process. This multi-functionality eliminates the need for separate cooling infrastructure.
Solution Approach 2:
The cooling function is merged with the retaining pin structure by integrating cooling channels directly into the pin. This combination consolidates two separate components (retaining pin and cooling system) into one, reducing overall device complexity while maintaining the necessary cooling capability.
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 method effectively suppresses gap formation between the seal member and retaining pin, maintaining sealing performance and reducing the time required for cooling and hardening, thus improving productivity.
Implementation Method 1
the seal member is cooled through the retaining pin with a cooling channel
Data Source
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AI summary
A manufacturing method for manufacturing a pipe joint including a circular tube-shaped housing and an elastically deformable circular tube-shaped seal member provided at an inner peripheral side of the housing. The pipe joint manufacturing method includes a process of placing the seal member inside a mold in a state in which the seal member is fitted to an outer periphery of a retaining pin, and a process of causing a molten resin to flow into the mold so as to mold the housing in a state in which the seal member is cooled through the retaining pin.