Today's KNOWLEDGE Share : Injection mold cons and pros for spring-loaded lifters:

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Today's KNOWLEDGE Share

Injection mold cons and pros for spring-loaded lifters:

Spring-loaded lifters, often used in injection molding to help demold intricate parts with undercuts or features that can't be ejected straight out, offer a blend of advantages and disadvantages.


Pros:

Ability to handle undercuts: Spring-loaded lifters facilitate the release of internal undercuts or faces without draft, expanding design possibilities for molded parts.


Space-saving design: Spring lifters are well-suited for situations where space within the mold is limited due to their simpler processing and convenient use.


Reduced waste: Properly designed and maintained lifters minimize part damage during ejection, leading to lower scrap rates and reduced waste.

Increased efficiency: They can potentially shorten the production cycle by efficiently releasing parts,


Cons:

Limited to shallow undercuts: Spring-loaded lifters are generally suitable for products with shallow undercuts (typically less than 3mm deep).

Potential for fatigue: For deeper undercuts, the required angle change is greater, which can lead to lifter elasticity fatigue and potential failure,

Susceptible to "read-through" and gloss issues: Lifters can cause cosmetic problems on the molded part, such as read-through (visible marks of the lifter) and variations in gloss, potentially due to factors like insufficient cooling or lifter deflection.


Requires careful design and maintenance: Proper lifter design, including factors like draft angles, clearances, and a flat surface near the melt flow, are crucial for optimal performance and preventing dragging or sticking.


Maintenance considerations: Regular cleaning, inspection, and appropriate lubrication are essential to ensure spring-loaded lifters perform reliably and have a long lifespan.


Additional considerations:

High temperatures: The heat resistance of the die spring needs to be considered, especially in molds using hot oil for temperature control, as high temperatures can lead to spring relaxation and loss of force.


Part retention: Some parts may tend to stick to the lifters after ejection, potentially requiring additional ejector pins or gripper details to ensure proper part release.


Safety and durability: Choosing the right materials, such as hardened alloys and tool steels, for lifter components is crucial to ensure durability and resistance to deformation under operational stresses.


source : Amer

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