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A Design Study in Austempered Ductile Iron - Smith Foundry Drive Wheel


Three features on the drive wheel require separate machining steps. 

  1. The OD of the two rims are turned.
    Three chucking pads are designed into the ID of the rims for the turning operation.

  2. The ID of the center bore is turned.

  3. The keyway in the center bore is broached.

The machining operation is done before the austemper heat treatment.
Austempered ductile iron is a work-hardening material and it is easier to machine before the austempering heat-treatment. 

The austempering heat-treatment produces a volume change in the part which has to be  considered in the machined tolerances. 




Copyright 2005 by the American Foundry Society. All rights reserved.
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Last Modified:May, 2005 by STG

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In cooperation with
Smith Foundry Co