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Injection Molding Design Guidelines

Much has been written regarding design guidelines for injection molding. Yet, the design guidelines can be summed up in just a few design rules.

1 Use uniform wall thicknesses throughout the part. This will minimize sinking, warping, residual stresses, and improve mold fill and cycle times.
2 Use generous radius at all corners. The inside corner radius should be a minimum of one material thickness.
3 Use the least thickness compliant with the process, material, or product design requirements. Using the least wall thickness for the process ensures rapid cooling, short cycle times, and minimum shot weight. All these result in the least possible part cost.
4 Design parts to facilitate easy withdrawal from the mold by providing draft (taper) in the direction of mold opening or closing.
5 Use ribs or gussets to improve part stiffness in bending. This avoids the use of thick section to achieve the same, thereby saving on part weight, material costs, and cycle time costs.
Common Design Elements

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Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!