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Common design mistakes in injection molding often occur when manufacturability is not properly considered during the design phase.
One of the most common issues is non-uniform wall thickness. This leads to uneven cooling and shrinkage, which can cause warping or sink marks. Maintaining a consistent wall thickness is essential for a stable and high-quality part.
Another mistake is the use of sharp corners. These create stress concentrations and increase the risk of cracks or failure. Adding proper radii improves both strength and material flow.
Draft angles are also often overlooked. Without sufficient draft, parts can be difficult or impossible to eject from the mold, which can result in damage or production issues.
A common misconception is that a design is always technically feasible just because it looks correct on a drawing. In reality, not every design is suitable for injection molding without adjustments.
In short, good design for injection molding requires uniform wall thickness, rounded corners, sufficient draft angles, and a strong focus on manufacturability from the start.
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