Extruding Container Female Thread Mold Segmentation
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Solution Overview
Problem
The existing injection molding method for manufacturing female thread members in filler extruding containers often results in forced extraction, leading to broken threads and increased manufacturing costs due to the need for core pin removal, which is time-consuming and costly.
Innovation Solution
The design incorporates a female thread member with an inner tube that expands diametrically through slits, allowing for easier core pin removal without breaking the thread, using a novel structure that includes an outer tube and inner tube with annular spaces and slits, facilitating the use of elasticity to draw out the core pin without damaging the thread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the core pin is drawn out in the axial direction at a time of mold releasing, then the mold releasing process is simplified, but the female thread is broken due to forced extraction
Solution Approach 1:
The core pin is divided into two separate components: a first core pin for forming the inner tube and a second core pin for forming the outer tube. This segmentation allows each core pin to be extracted independently, enabling the first core pin to be drawn out axially without causing forced extraction, while the second core pin is drawn out after rotating the molded article. This resolves the contradiction by simplifying the mold releasing process for the inner tube while preserving the integrity of the female thread formed in the outer tube.
2Reliability
If the core pin is drawn out by rotating it, then the female thread is not broken, but the manufacturing time and cost increase
Solution Approach 1:
The core pin removal process is segmented into two distinct operations: first, the first core pin is drawn out axially without rotation to form the inner tube, which is quick and simple; second, after the molded article is removed from the outer mold, the second core pin is drawn out by rotating the molded article to form the outer tube with the female thread. This segmentation allows the majority of the production (inner tube formation) to be completed efficiently, while the rotation step is only required for the outer tube, thereby improving overall manufacturing efficiency while ensuring thread integrity.
Solution Approach 2:
The inner tube is formed first by drawing out the first core pin axially while the molded article is still in the mold. This preliminary action prepares the structure for subsequent outer tube formation and reduces the complexity of the final rotation step, as the inner tube already provides structural support and guidance.
3Device complexity
If a single core pin is used for both inner tube and outer tube, then the mold structure is simplified, but the core pin cannot be drawn out without breaking the thread
Solution Approach 1:
The single core pin is segmented into two separate core pins: a first core pin that forms the inner tube and a second core pin that forms the outer tube with the female thread. This segmentation is necessary because the inner tube and outer tube require different extraction methods to avoid thread damage. The increased device complexity is justified by the significant improvement in reliability and the ability to produce functional components without thread breakage.
Solution Approach 2:
The first core pin is inserted through the second core pin during the molding process, with the first core pin forming the inner tube and the second core pin forming the outer tube. This nested arrangement allows both tubes to be formed simultaneously in a single molding operation, maintaining efficient production while enabling differentiated extraction methods for each core pin to preserve thread integrity.
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 reduces manufacturing costs and improves productivity by allowing the core pin to be drawn out without breaking the female thread, maintaining the same functional performance as conventional designs.
Implementation Method 1
thereby elasticity is generated and the inner tube is expanded to the outer side in a diametrical direction by drawing out the first core pin to one side
Data Source
AI summary
To reduce manufacturing cost of an extruding container, a female thread member (5) integrally has an outer tube (5a) and an inner tube (5b) with an annular space (5s) between them being open to one side in an axial direction, and the inner tube (5b) has a female thread (5e) formed on an inner peripheral surface from one side and to extend in the axial direction and slits (5n) extending in the axial direction and being open to one side, while a core pin including a male thread corresponding to the female thread (5e) and a protruding portion corresponding to the slits (5n), is drawn out from an outer mold after a middle mold having a convex portion corresponding to the space (5s), whereby the core pin can be drawn out without breaking the female thread (5e) as the inner tube (5b) is expanded by the slit (5n).