Method for processing difficult-to-cut cast iron
AssigneeSumitomo Electric Hardmetal Corp.
InventorsKatsumi Okamura, Satoru Kukino, Tomohiro Fukaya
Life of this patent
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Abstract
In a pilot hole of a workpiece made of a difficult-to-cut cast iron, a cutting tool having a leading end to which a cutting insert is attached is inserted to cut the surface of the wall of the pilot hole. At this time, the cutting tool rotates about an axis (α) and also revolves about another axis (β), so that contouring is performed on the workpiece by the tool. The cutting insert is formed of a sintered body having a CBN content of not less than 85% by volume, and the cutting insert has a thermal conductivity of not less than 100 W/(mK).
Claims3
A method for processing a difficult-to-cut cast iron, comprising the steps of:
- preparing a workpiece made of a difficult-to-cut cast iron;
- and
- cutting said workpiece using a cutting tool having a cutting insert,
- in said step of cutting said workpiece, said cutting tool revolving while rotating to allow said cutting insert to intermittently contact said workpiece,
- said cutting insert being formed of a sintered body having a CBN content of not less than 85% by volume,
- said cutting insert having a thermal conductivity of not less than 100 W/(mK),
- in said step of cutting said workpiece, X is not less than 0.2 μsec and not more than 2 μsec and X/Y is not less than 0.06 and not more than 0.16 where X is a contact time for which said cutting insert and said workpiece contact each other and Y is a noncontact time for which said cutting insert rotates and revolves without contacting said workpiece, and
- in said step of cutting said workpiece, a cutting speed is not less than 1000 m/min.
Dependencies are inferred from the claim text.