Injection Molding Lifter With Nested Plunger And Slide Mechanism
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Solution Overview
Problem
Current injection molding tools lack an efficient mechanism for forming and ejecting components with complex features, such as apertures or recesses, due to limitations in the movement and positioning of actuators within the mold cavity.
Innovation Solution
The proposed lifter for injection molding tools includes a housing, plunger, and slide member, where the plunger and slide member move in coordinated linear and perpendicular paths to define and retract cavities, allowing for the formation and ejection of components with features like apertures by controlling resin flow during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple actuator is used in the mold cavity, then the device complexity is reduced, but the manufacturing precision of complex features like apertures and recesses deteriorates
Solution Approach 1:
The actuator is divided into multiple functional components: a plunger for forming apertures, a slide member for forming recesses, and a lifter for ejection. Each component performs a specific function, allowing the system to achieve complex manufacturing capabilities while maintaining relatively simple individual elements. The segmentation enables independent optimization of each component's structure and function.
Solution Approach 2:
The slide member is received within the plunger, and both are positioned within the mold cavity. This nested arrangement allows multiple functions (aperture formation by plunger, recess formation by slide member) to be integrated in a compact space, reducing overall device complexity while maintaining manufacturing precision for complex features.
2Ease of operation
If the plunger and slide member move independently, then the ease of operation is improved, but the manufacturing precision of coordinated cavity formation deteriorates
Solution Approach 1:
The plunger and slide member are connected through a shared aperture structure, where the slide member is received within the plunger. This merging allows both components to move relatively independently for ease of operation while maintaining precise coordination through their geometric relationship, ensuring accurate cavity definition when both are in position.
Solution Approach 2:
The plunger moves along one axis (vertically into the cavity) while the slide member moves perpendicular to that direction (horizontally within the cavity). This multi-dimensional movement independence allows each component to be operated separately while their coordinated positioning in different dimensions ensures precise cavity formation through their combined action.
3Manufacturing precision
If the projection remains in the extended state during resin flow, then the manufacturing precision of aperture formation is improved, but the productivity of the molding process deteriorates
Solution Approach 1:
The plunger is moved to the retracted position before resin injection to allow the aperture to be formed. The resin is then injected into the cavity, and only after sufficient cooling does the plunger move to the extended position to define the aperture shape. This preliminary retraction allows the cavity to be filled efficiently without delaying the overall molding process, as the aperture formation occurs after the resin has already flowed into the main cavity.
Solution Approach 2:
The molding process maintains continuous useful action by overlapping operations: while the plunger is retracting to form the aperture, the resin injection can proceed simultaneously into the main cavity. The slide member can also move independently to form recesses during this time. This parallel execution of multiple formation operations ensures continuous productive activity without significant idle time, improving overall productivity while maintaining precision.
Data Source
AI summary
An actuator for an injection molding tool includes a housing, a plunger and a slide member. The housing includes an aperture extending therethrough and a first recess extending through an open end of the aperture. The plunger is slidably received in the aperture and is movable therein relative to the housing between first and second positions. The plunger may include a second recess formed therein that cooperates with the first recess to define a cavity when the plunger is in the first position. The slide member slidably engages the plunger for movement relative to the plunger between an extended position in which the slide member extends into the cavity and a retracted position in which the slide member is retracted out of the cavity.