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Baruffi, Federico
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Publications (4/4 displayed)
- 2018A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillarscitations
- 2017Investigation on the micro injection molding process of an overmolded multi-material micro component
- 2016Metrology of sub-micron structured polymer surfaces
- 2016Performance verification of focus variation and confocal microscopes measuring tilted ultra-fine surfaces
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article
A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
Abstract
The purpose of this paper is to present the method of a soft tooling process chain employing Additive Manufacturing (AM) for fabrication of injection molding inserts with micro surfacefeatures. The Soft Tooling inserts are manufactured by Digital Light Processing (vat photo polymerization) using a photopolymer that can withstand relatively high temperaturea. The part manufactured here has four tines with an angle of 60°. Micro pillars (Ø200 μm, aspect ratio of 1) are arranged on the surfaces by two rows. Polyethylene (PE) injection molding with the soft tooling inserts is used to fabricate the final parts. This method demonstrates that it is feasible to obtain injection-molded parts with microstructures on complex geometry by additive manufactured inserts. The machining time and cost is reduced significantly compared to conventional tooling processes based on computer numerical control (CNC) machining. Thedimensions of the micro features are influenced by the applied additive manufacturing process. The lifetime of the inserts determines that this process is more suitable for pilot production. The precision of the inserts production is limited by the additive manufacturing process as well.