details DESIGN


Smooth transitions drastically re- duce the stress concentrating factor.


Locating the cored pockets and holes co-planner to the parting plane makes die fabrication simpler.


• Fostering smooth fl ow of the liquid metal into the cavity avoids the creation of in- clusions and re-oxidation materials that become trapped in the product.


Locating mounting holes as part of the main die cavity provides high precision tolerance.


• Key with diecasting design is the careful selec- tion of the parting plane and gate position with reference to the critical features. Key features should be positioned as part of the main die cavity whenver possible, and stay away from the movable slides and core pins, as they wear out cycle after cycle and add to the variability.


Cored pockets lighten up heavy sections to reduce weight.


• Heavier sections don’t provide more strength proportionately due to slower cooling rates; hence, design engineers should take advantage of cored pockets to lighten up the section.


Jiten Shah is president of Product Development & Analysis (PDA) LLC (www.PDA-LLC.com), Naperville, Ill., and a 25-year casting design and manufacturing veteran.


Nov/Dec 2013 | METAL CASTING DESIGN & PURCHASING | 17


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