modern CNC equipment, Nickel Aluminum Bronze is relatively easy to
machine. Depending on the alloy,
machinability ratings vary between 20 to 50 (with free cutting brass being 100). It’s still difficult to give exact machining
guidelines, as the feeds and speeds rates vary depending and the size and age
of CNC lathes used. This article with
try to give some general guidelines to give you an idea where to start
Lubrication is recommended when machining Nickel Aluminum
Bronze, particularly where close tolerances are required. Like other copper
based alloys, heat generation caused by the machining of the metal can cause
expansion and when the part cools can result in contraction which will take the
part out of tolerance.
Nickel Aluminum Bronze alloys can produce a curled swarf
chip which can jam tooling and cause surface imperfections. Particularly when machining bores. It’s advisable to have a chip breaking
profile and have sufficient lubrication, sometimes under high pressure, so that
the swarf is removed from the cutting face.
Another option is to retract the tooling on a regular basis to prevent
excessive metal build up.
A coated carbide titanium indexable tip is recommended for
roughing and removal of the bulk of the stock.
For heavy metal removal, the size of the tip needs to increase.
C95500 Nickel Aluminum Bronze – 50
C63000 AMS 4640 Nickel Aluminum Bronze – 30
C95510 AMS 4880 Nickel Aluminum Bronze – 50
C63020 AMS 4590 Nickel Aluminum Bronze – Not listed
Hopefully the information above helps give you some idea on
how to machine Nickel Aluminum Bronze.
Here at National Bronze Mfg. we supply both the raw material and completely
machine components. For more information
on these products follow the links below: