Cleaning and finishing: getting the casting ready for shipping.
Modern Casting › Vol. 79 Nbr. 11, November 1989
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Summary
The Metalcasting Process: Part 11 of 12
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Cleaning and finishing: getting the casting ready for shipping.
Cleaning and Finishing: Getting the Casting Ready for Shipping
By the time a casting reaches the cleaning room, it will have achieved its final dimensional shape and its initial surface finish. Unless it requires some secondary processing, its chemistry and physical properties are intact as well. But in nearly all cases with all molding and casting processes, some degree of cleaning and finishing is required to make a metal casting presentable for shipping to the customer. In some instances, cleaning and finishing operations are used to merely improve the appearance of the casting. In others, they are utilized to correct deficiencies created by poor molding, coremaking and melting practices. Because of the amount of handwork involved, particularly chipping, grinding, and general casting handling, this step in the metalcasting process can account for as much as 40% of a foundry's direct labor costs. Minimizing the time and effort required to get a casting ready for shipping is important in a foundry's bottom line performance. The basic operations required to clean and finish a casting generally include the removal of core and molding sand, as well the gates, risers, runners and fins not removed during shakeout. Scale, caused by carbonaceous materials such as seacoal or mold and core washes, as well as scale caused by heat treating and stress relieving operations, must be removed. Final quality checks, p...See the full content of this document
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