Injection Molding Part Design For Dummiespdf Exclusive [ SECURE × 2024 ]

An undercut is any feature of your part that would lock it into the mold, preventing straight ejection. This includes holes, clips, or lugs that aren't aligned with the mold's opening direction. Undercuts can be molded, but they require complex and expensive mechanisms like that move perpendicularly to the main mold opening. The golden rule is to design your part to avoid undercuts if possible by changing your parting line orientation. Every undercut you eliminate adds cost savings to your mold.

Rounded corners reduce tool wear and allow the plastic to fill the mold cavity with less pressure. 5. Bosses and Fastening Features injection molding part design for dummiespdf exclusive

The place where the A-side and B-side meet is called the . It is visible on the final plastic piece as a faint witness mark. An undercut is any feature of your part

Instead of making walls thicker to add strength—which violates Rule #1—use and gussets . Ribs are thin, protruding walls running along a surface to add stiffness, while gussets act as mini-triangular supports for standing walls. The golden rule is to design your part

When variable wall thickness is unavoidable, you must incorporate smooth, gradual transitions. A sharp, abrupt step from a thick wall to a thin wall is a recipe for failure. Remember, "Incorrect thickness in design for injection molding is the root of (almost) all evil".