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detailset DESIGN


Process Flexibility Accommodates Farm Part Requirement


JITEN SHAH, PRODUCT DEVELOPMENT & ANALYSIS, NAPERVILLE, ILLINOIS CASTING PROFILE


Cast Component: Tube clamp. Process: Green sand. Material: Ductile iron. Weight: 42 lbs. Dimensions: 6 x 3 x 3.5 in.


A


conversion from a steel weldment to a ductile iron casting for a farm fi eld harrow machine reduced the component cost for Besler Industries, Cambridge, Nebraska, by 60%. T e farm equipment manufacturer worked closely with its casting supplier, Smith Foundry, Minneapolis, on the redesign, which uses a core to create three holes


and a zero draft vertical face. Along with cost savings, the cast redesign looks better and reduces wobble in the assembly, according to the OEM.


Offset parting line provided the fl exibility to include a recessed diameter around a cast-in hole.


• Typically, the parting line is located so it cuts across the largest cross section, which aids in core place- ment. However, doing so in this case would not have allowed a key feature—a recessed diameter around one of the holes—to be incorporated.


• An off set parting plane following the bottom of the trapezoid fl ange accommodated the key feature and allowed the lettering in the drag portion of the mold.


16 | METAL CASTING DESIGN & PURCHASING | Jan/Feb 2016


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