DFM Guidelines for Injection Molding

Optimizing Part Design for Molding

There are many design elements involved when creating plastic parts for injection molding'design for cost, design for quality, design for assembly, design for manufacturability. And navigating that landscape can be challenging at times. At Protolabs, we provide automated design analysis on CAD models that highlights features in your part design that can be adjusted for moldability. It's a great design resource to have at your fingertips. To keep those moldability advisories at a minimum and optimize your part design, we created this helpful kit of different injection molding resources.

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What is injection molding?

Injection molding is a manufacturing technology for the mass-production of identical plastic parts with good tolerances. In Injection Molding, polymer granules are first melted and then injected under pressure into a mold, where the liquid plastic cools and solidifies. The materials used in Injection Molding are thermoplastic polymers that can be colored or filled with other additives.

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Almost every plastic part around you was manufactured using injection molding: from car parts, to electronic enclosures, and to kitchen appliances.

Injection molding is so popular, because of the dramatically low cost per unit when manufacturing high volumes. Injection molding offers high repeatability and good design flexibility. The main restrictions on Injection Molding usually come down to economics, as high initial investment for the mold is required. Also, the turn-around time from design to production is slow (at least 4 weeks).

Want more information on plastic injection mold design? Feel free to contact us.