Injector Nozzle Terminal Through Ring Nut Configuration
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Solution Overview
Problem
Conventional injection moulding apparatuses face challenges in producing transparent or semi-transparent aesthetic components, such as motor vehicle lamp lenses, due to issues like concentricity errors, increased wear, and stagnation areas between the tip and ring nut, leading to longer production times and economic damage.
Innovation Solution
The nozzle terminal of the injector features a distal end that extends into the moulding cavity, with a wall thickness equal or less than the valve pin's cross-section, eliminating stagnation areas and providing a greater guide surface, thus simplifying the mould matrix operation and reducing gate mark dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the tip extends axially beyond the ring nut distal end (outer ring nut configuration), then the gate mark dimensions are reduced, but the mould operation complexity increases and concentricity errors occur
Solution Approach 1:
Instead of having the tip extend beyond the ring nut (outer configuration), the invention inverts the arrangement by having the ring nut extend beyond the tip (through ring nut configuration). This inversion simplifies mould operation while managing gate mark visibility through the extended ring nut structure that provides a larger cooperation area with the gate.
Solution Approach 2:
The invention addresses the gate mark dimension issue by transitioning from an outer ring nut configuration to a through ring nut configuration, where the ring nut extends axially beyond the tip into the moulding cavity. This dimensional change allows the gate cooperation area to be distributed across the extended ring nut structure rather than concentrated at the tip end.
2Ease of operation
If the through ring nut configuration is used with distal end extending into the moulding cavity, then the mould operation is simplified, but the gate mark dimensions increase
Solution Approach 1:
The invention applies local quality by configuring the ring nut with a specific wall thickness that is equal to or less than the valve pin cross-section. This localized dimensional control ensures that while the ring nut extends into the moulding cavity to simplify operation, the gate mark dimensions are controlled to remain acceptable for aesthetic components.
3Object-generated harmful factors
If the tip and ring nut have different distal end positions, then stagnation areas are created, but if they are aligned, then concentricity control becomes difficult
Solution Approach 1:
The invention implements dynamics by making the ring nut axially displaceable relative to the tip through the valve pin. This dynamic configuration allows the ring nut to be positioned in different axial locations (retracted or extended) depending on the operational requirements, enabling the system to adapt between minimizing stagnation areas and simplifying mould operation.
Data Source
AI summary
A nozzle terminal of an injector comprises a tip and a ring nut having respective distal ends one of which is configured so as to be coupled with a gate of a moulding cavity, it cooperates with the shutter terminal of the valve pin of the injector, and it has an overall thickness in cross-section which is equal to or less than that of the cross-section of the shutter terminal of the valve pin.