Molding Coupling with Nested Core Pins for Tube Interconnection
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Solution Overview
Problem
Molding processes face challenges in removing core pins from mold cavities after the molding process, leading to difficulties in releasing the formed reproduction, and existing solutions do not adequately address this issue.
Innovation Solution
The process involves inserting primary and secondary core pins into tubes, which are then placed within a mold cavity filled with thermoplastic material to form a coupling. The secondary core pin is disengaged and removed by passing through the secondary tube, and the primary core pin is removed by passing through one of the tubes, allowing for efficient extraction without damaging the coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If core pins are used to form hollow portions in mold cavities, then the reproduction can be formed with the desired hollow structure, but the core pins become difficult to remove from the mold cavity after molding
Solution Approach 1:
The core pin system is divided into multiple segments: a primary core pin and secondary core pins that can be removed in sequence. The primary core pin remains in the mold cavity while secondary core pins are removed through the hollow portions, allowing progressive extraction without damaging the formed reproduction.
Solution Approach 2:
The invention extracts the core pin system in stages through the hollow portions formed in the reproduction. Secondary core pins are removed first through the hollow portions, followed by the primary core pin, enabling complete extraction without requiring mold opening or causing damage to the formed object.
2Ease of operation
If core pins are withdrawn from the mold cavity prior to opening the mold, then the reproduction can be easily released, but the core pins may interfere with the removal process if not properly positioned or designed
Solution Approach 1:
The core pins are positioned and secured in the mold cavity before the molding process begins. The primary core pin is placed in the hollow portion while secondary core pins are positioned to extend through the hollow portions, ensuring they are properly aligned and secured before the reproduction is formed, which simplifies the subsequent removal process.
3Device complexity
If a single core pin is used to form hollow portions, then the mold cavity can be simplified, but the core pin cannot be removed without opening the mold
Solution Approach 1:
The core pin system uses a nested arrangement where secondary core pins are positioned within the hollow portions formed by the primary core pin. This nested structure allows the secondary core pins to be removed through the hollow portions without requiring mold opening, while the primary core pin remains secured in the hollow portion for later removal.
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 enables the successful formation and removal of core pins from the mold cavity, facilitating the production of couplings with smooth interconnections between tubes, overcoming the challenge of core pin removal and allowing for reusable mold components.
Implementation Method 1
A liquefied material was poured into a mold cavity to solidify within the mold cavity
Data Source
AI summary
A coupling and a process of molding the coupling is disclosed for interconnecting a primary and a secondary tube. The process comprises the steps of inserting a primary core pin into the primary tube. A secondary core pin is inserted into the second tube to abut with the primary core pin. The assembled tubes and core pins are placed within a mold cavity and a thermoplastic material is injected for forming the coupling. The coupling and the interconnected tubes are removed from the mold cavity. The secondary core pin is disengaged from the secondary core pin to be removed by passing the secondary core pin through the secondary tube. The primary core pin is removed by passing the secondary core pin through the primary tube. The coupling forms a smooth interconnection of the inner cross-sections of the first and second tubes.