| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of drilling new heat-resisting cast steel where 4a, 5a, 6a family component is added with high efficiency and long life. SOLUTION: This method, cutting heat-resisting cast steel forming an automotive part formed by containing C of 0.2 wt.% or less, Ni of 8 wt.% or less, Cr of 15 wt.% and 4a, 5a, 6a family component of one or more types, includes a drill covered with hard coating whose base metal is particulate cemented carbide of 1μm less in the average grain size of WC and whose main ingredients are Ti and Al.
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