Injection Molding Part Design For Dummiespdf Exclusive Jun 2026

Sharp corners create stress concentration points. When your part experiences mechanical load, it will likely crack right at the sharp corner. Furthermore, sharp corners restrict the smooth flow of molten plastic inside the mold. Design Guidelines

: Use rounded corners (fillets) rather than sharp edges to reduce stress concentration and improve material flow. Key Resources & PDF Downloads injection molding part design for dummiespdf exclusive

Plastic expands when heated and shrinks as it cools.If your part has thick sections and thin sections, the thin sections will cool and solidify first.The thicker sections will continue to cool and shrink long after, pulling the surrounding material inward. Consequence of Poor Design Sharp corners create stress concentration points

Depending on the material, ideal wall thicknesses generally range from 1.5 mm to 4 mm. Going too thick wastes material and increases cycle time, while going too thin can prevent the mold from filling completely. 2. Add Draft Angles to Every Wall Design Guidelines : Use rounded corners (fillets) rather

Adding radii (rounded exterior corners) and fillets (rounded interior corners) streamlines the flow of molten plastic inside the mold cavity. Smooth transitions reduce turbulence and stress concentrations, yielding a much tougher final product. Design Guidelines

Like ribs, the wall thickness of a boss should not exceed 60% of the main wall thickness.

Bosses should be designed to prevent sink marks. The thickness of the boss base should be roughly of the main wall.