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Because the low thermal conductivity of sintered carbide, it is
easy to crack at the surface during E.D.M.. It influences the
life and presision of tool and mold severely. In experiments,
we change the parameters of E.D.M. to examine the crack state
and bending strength of materials due to electro-discharge
Experiments show that the material removal rate is better at
higher electro-discharge energy density during machining P and
K kind sintered carbide, but the electrode wear rate increases.
When machining P kind sintered carbide, the material removal
rate is better, and the electrode wear rate is smaller.
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