Undercuts and complex internal geometries pose significant challenges in LSR mold design but are often necessary for functional part requirements. Side-actions, lifters, and collapsible cores are mechanical solutions that allow ejection of otherwise trapped features. These mechanisms add complexity but enable production of intricate components like sealing rings with locking grooves.
Sliding shut-offs and angular pin configurations require extremely tight tolerances to prevent flash while maintaining smooth movement. Proper lubrication and wear-resistant coatings extend operational life of these moving elements. Timing of actuation relative to opening stroke must be precisely controlled to avoid interference or damage during demolding.
Advancements in mold technology now include hydraulic or pneumatic cylinders integrated within the mold base providing controlled motion for complex side pulls. Full-motion simulations during design phase identify potential interferences early minimizing costly corrections later. Collaboration with experienced mold makers accelerates development timelines significantly.
For highly complex parts, multi-directional pulling actions or even unscrewing mechanisms may be incorporated. Though expensive and slower than standard molds, they unlock possibilities for innovative designs previously deemed unmoldable. Risk mitigation through prototype testing validates feasibility before committing to full hard tooling investments.
