Umbrella Seal Fastener Molding With Angled Slide Ejection
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Solution Overview
Problem
Conventional injection molding methods for fastener devices with umbrella seals risk breaking or weakening the seals and cause uncontrollable ejection, leading to distorted heads and collection difficulties.
Innovation Solution
An injection molding method using angled and straight slides to form the mold cavity, allowing angled separation of angled slides parallel to the umbrella surface and lateral outward movement of straight slides, ensuring consistent ejection without flexing the umbrella seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If undercut slides are used to make umbrella seals, then the seal shape can be formed, but the seal may be broken or weakened
Solution Approach 1:
The mold cavity is divided into multiple sections with separate slide mechanisms. The first set of slides forms the fastening portion and inside surface, while the second set forms the head, anchor stem, and outside surface. This segmentation allows each slide to be optimized for its specific function, preventing the umbrella seal from being compromised by aggressive undercutting actions.
Solution Approach 2:
Instead of using traditional undercut slides that pull the inside surface of the umbrella seal, the invention uses a combination of angled and straight slides that form the seal shape through a different mechanism. The angled slides create the fastening portion while the straight slides form the outside surface, inverting the conventional approach of using a single undercut slide to define the entire seal geometry.
2Ease of manufacture
If conventional undercut slides are used, then the mold cavity can be formed, but the head may be pulled and distorted during ejection
Solution Approach 1:
The slide system is segmented into two distinct sets: the first set for the fastening portion and inside surface, and the second set for the head, anchor stem, and outside surface. This segmentation allows the head to be formed without being subjected to the distorting forces that would otherwise be applied during ejection, as each slide set can be optimized for its specific region.
Solution Approach 2:
Different regions of the mold cavity are formed by slides with different geometric characteristics. The angled slides create the fastening portion with appropriate angles, while the straight slides create the head and anchor stem regions. This local differentiation ensures that each region receives the precise geometric quality needed, preventing distortion of the head during the ejection process.
3Productivity
If conventional molding methods are used, then fastener devices can be produced, but collection and shipment become difficult
Solution Approach 1:
The mold cavity is segmented into multiple independent regions formed by separate slide sets. This segmentation allows for controlled ejection of the fastener devices in a systematic manner, with each region can be ejected independently or in sequence, making collection and shipment operations more straightforward and efficient.
Data Source
AI summary
An injection molding method for manufacturing a fastener device having an umbrella style seal includes providing a mold having at least a first set of two angled slides defining a shape of a fastening portion and an inside surface of an umbrella of the fastener device, and a second set of two straight slides defining a shape of a head, an anchor stem and an outside surface of the umbrella of the fastener device; assembling the first set of the two angled slides, and the second set of two straight slides to form the mold cavity; injection molding plastic into the mold cavity; and separating the first set of the two angled slides parallel to an upper surface of the umbrella in a direction angled with respect to the second set of the two straight slides, and separating the second set of the two straight slides laterally.