Design Element | Suggestions (Industry Standard Values) | Reasons and Benefits |
---|
Wall Thickness | Typical thickness: 1.0 - 3.0 mm (ideal ~2.0 mm) | Ensures uniform cooling, reduces shrinkage, warping, and molding defects. |
Draft Angles | Recommended draft: 1° - 3° per side | Facilitates part ejection, minimizes mold wear, improves surface finish. |
Corner Radii | Minimum internal radii: 0.5 - 1.0 mm | Reduces stress concentration, improves mold filling, prevents cracking. |
Rib Thickness | Thickness approximately 50 - 70% of adjacent walls | Adds strength without shrinkage, warping, or creating sink marks. |
Rib Height | Maximum height ≤ 3x rib thickness | Prevents defects, ensures proper filling, reduces cooling issues. |
Boss Diameter | Typical diameter ≥ 2x hole diameter | Maintains strength, reduces sink marks, ensures proper filling. |
Hole Size | Minimum hole diameter ≥ 1.0 mm | Ensures reliable molding, prevents incomplete filling or distortion. |
Undercuts | Avoid or minimize (use slides or inserts if necessary) | Simplifies mold complexity, reduces costs, and improves part quality. |
Surface Finish | Typical rapid molding finish: Ra 0.8 - 3.2 µm | Achieves balance between cosmetic appearance, accuracy, and cost. |
Tolerances | Typical dimensional tolerance: ±0.1 - 0.25 mm | Reflects achievable accuracy, balancing quality and rapid production. |
Text and Logos | Minimum height/depth ≥ 0.5 mm | Ensures clarity, readability, and accurate reproduction during molding. |
Gate Location | Position gates at thicker sections | Promotes uniform filling, reduces stress, prevents shrinkage defects. |
Shut-off Surfaces | Use flat surfaces for shut-offs | Simplifies mold tooling, reduces flash, and improves quality. |
Parting Line | Keep simple and along the largest cross-section | Minimizes flash, improves surface finish, reduces tooling complexity. |
Inserts | Minimum embedment ≥ 1.5x insert diameter | Ensures stable positioning and strong integration in the final part. |