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Rough Machining for Metal Castings
Rough machining is important for exported
metal castings. It can
largely reduce the defective rates of castings, and can meet the
dimensional requirements to some positions.
Rough machining is different with finish machining. After we
complete the rough castings,
or called as raw castings, we can do some coarse machining works,
such as milling and lathe, and leave 0.5 to 1.0mm machining
allowance for the further finish machining works.
Normally, rough machining works should be done by the
metal foundries,
and finish machining works were done by clients or entrusted
professional machining workshops.
Why is rough machining necessary?
Firstly, there are many types of
casting defects beneath the surface of metal castings,
such as shrinkage, cracks, pin air holes, sand inclusion etc. These
defects can not be found during visual inspection. So, when the
clients receive the casting products, and during machining process,
these defects will be shown up, then it will cause more costs for
return castings and machining costs. As for the exported casting
products, retreating defective castings will cause much more costs.
However, if metal foundries could do some rough machining in-house,
they will be able to find these defective castings, and recycle the
casting materials, so will reduce the loss for both themselves and
their clients largely.
Secondly, as for some dimensions, rough casting can not meet the
accuracy requirements. As for the rough casting dimensional
tolerance grades, please check our related articles. If the required
tolerance is out of rough casting tolerance range, then rough
machining will be needed. Moreover, deformation is inevitable for
rough castings, so rough machining could make the deformed surfaces
more flat.
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