While most die castings are produced to near-net-shape, and many to net-shape, the close tolerances possible with die casting and the repeatability of the process suits die cast parts to economical high-precision secondary machining operations.
A die
casting can be designed to accurately adapt to machining fixtures by casting in
locator holes or casting a flush locating datum surface. Die castings can be
drilled, tapped, reamed, punched, or have nearly any type of machining
operation performed on them.
Machining
operations, including gaging and any other secondary operations that may be
required, can be performed by the die caster. Properly designing the part and
the die for optimum quality and economy in secondary machining will have an
important impact on reducing final part costs. Detailed discussions should be
held with die caster engineering personnel to establish such machining
parameters as the precise location, extent, and depth of the machining
required; the surface finish required; and any other specification necessary to
result in a quality component.
Decisions on special machining equipment ownership, maintenance
and replacement must also be discussed. Such matters are outlined in the
Commercial Practices section of this manual.
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