Injection Mold Pin Mounting Hole Orientation for Ejection
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Solution Overview
Problem
In injection molding, the miniaturization of components leads to physical interference issues when removing injection-molded articles from molds, particularly when pin members protrude or recess, causing difficulties in ejection and potential damage, especially in small parts like FPC connectors.
Innovation Solution
A mold design with pin mounting holes on side-wall surfaces that are not perpendicular to the mold-removal direction, featuring protruding or recessed portions to accommodate pin members, ensuring smooth ejection by aligning the pin member's end face with the mold-removal direction, preventing interference and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pin members are inserted into pin mounting holes on side-wall surfaces, then pin members can be mounted for gas discharge or sensing functions, but the pin members may protrude or recess causing physical interference with the injection-molded article during removal
Solution Approach 1:
The patent positions the pin mounting hole on a side-wall surface that is not perpendicular to the mold-removal direction, effectively using a different spatial dimension (angular orientation) to resolve the interference problem. The pin member is mounted in a direction that is oblique to the ejection direction, allowing the pin to protrude or recess without interfering with the article removal path.
2Ease of operation
If the pin member's end face is aligned with the mold-removal direction, then ejection is facilitated, but the pin member cannot be properly mounted in the pin mounting hole
Solution Approach 1:
The patent creates an asymmetric configuration where the pin mounting hole is oriented at an angle relative to the mold-removal direction. This asymmetric arrangement allows the pin member to be mounted in a direction that is oblique to the ejection direction, resolving the conflict between alignment requirements for mounting and ejection.
3Length of moving object
If miniaturization of injection-molded articles is pursued, then smaller components can be manufactured, but physical interference during removal becomes more significant
Solution Approach 1:
For miniaturized articles, the patent employs a different spatial dimension by orienting the pin mounting hole at an angle to the ejection direction. This angular orientation allows the pin member to exist in a dimension that does not interfere with the article's removal path, which is particularly important for small components where even minor interferences are significant.
Data Source
AI summary
The pin mounting hole used to insert and mount the pin member having a pin-like shape is formed on, among the inner wall surfaces of the cavity, the second side-wall surface that is an inner wall surface other than the inner wall surfaces perpendicular to the mold-removal direction of the injection-molded article. On the second side-wall surface, the protruding portion protruding from the second side-wall surface is formed in the surface area located on the opposite side in the mold-removal direction with respect to the pin mounting hole.