greatly influenced by quantity. When an order is issued subject to release, the total quantity is important in the se- lection of metalcasting facility tooling, but each release is normally considered as a separate order by the metalcasting facility because each production order requires separate processing. Te purchasing manager can
determine the most economical lot size for cast parts when he knows the casting requirements in advance. Sav- ings realized by larger releases should be weighed against inventory costs, which include investment, space and records. Possible changes in product demand and casting design or prices may not be equated directly in num- bers, but are incorporated as a matter of judgment by experienced buyers. Te production quantity and rate
are major factors in selecting the casting process and type of mold pattern/tooling. Different metalcast- ing processes have different produc- tion rate capabilities, tooling costs and design change flexibility. Sand cast components often are preferred because design changes can be made with relative ease. Te quantity of cast parts can de-
termine tool material selection. Qual- ity wood tools will generally produce up to 100 parts within about a year. Wood and plastic tooling should be usable for up to 500 parts in a moder- ate time frame (one to five years) with periodic refurbishment. Metal tooling is recommended when more than 2,000 castings are required annually.
when castings arrive damaged, dinged or dirty. Look at the total cost when specifying packaging. Layered or cor- rugated packing often costs more on paper but reduces cost of scrap, rework and handling. Kitting should also be considered (that is, packaging side by side for delivery to an assembly line).
7 8 Technical Services
Close cooperation between the metalcaster and customer
will yield the greatest benefit for Jul/Aug 2014 | METAL CASTING DESIGN & PURCHASING | 31
Packaging Often customers specify bulk
packaging and are then upset
Metal tooling is recommended for orders where thousands of castings are required annually.
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