Abstract
The various causes of fracture damage to single crystal diamond tools used for finish turning pistons are discussed. The naturally occurring polycrystalline forms of diamond, Ballas and Carbonado are described. Laboratory evaluation tests of manufactured polycrystalline diamond tools are detailed and comparison is made with single crystal diamond tools in terms of tool life. Brief mention is made of further tests of manufactured polycrystalline diamond tools in piston production. Further laboratory tests in which both single crystal diamond and manufactured polycrystalline diamond tools were used to turn Al/Si alloys with different Si content are described. The results of the laboratory and piston production tests are discussed. It is concluded that some manufactured polycrystalline diamond tools can offer cost savings by their replacing single crystal diamond tools for finish turning pistons. It is finally suggested that some of the fracture damage obtained on single crystal diamond tools when turning Al/Si alloy pistons is caused by the presence in the alloy of large crystallites of silicon.
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