. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CASTINGS IN ACTION
Mining Conversion Handles Heavy Load
Cast Component: Snubber arm casting. Material: AISI 4320 modifi ed steel. Process: Nobake sand casting.
Casting Supplier: Spokane Steel Foundry, Spokane Valley, Wash.
Customer: P&H Mining Equipment, Milwaukee.
• The casting keeps the 25,000-lb. dipper door on a large electric mining shovel from opening and closing too fast. A full dipper load on the door is 227,000 lbs.
• Codesigned between the OEM P&H Mining and Spokane Steel Foundry, the cast part, which was converted from a steel fabrica- tion, resulted in a 40% reduction in machin- ing time, a 15% reduction in weight and a per unit savings of 46% ($81,178 annually).
• The part weighs 207.72 lbs. and measures 33 x 9 x 14 in.
JULY/AUGUST 2010 METAL CASTING DESIGN & PURCHASING 19
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