Indexable insert for milling and milling cutter employing the same
AssigneeSumitomo Electric Industries, Ltd.
InventorMasanori Mizutani
Life of this patent
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Abstract
An indexable insert for milling includes a metal base made of cemented carbide, and a cutting edge consisting of a sintered CBN compact and a flat drag type cutting edge which are brazed to the metal base or bonded thereto by integral sintering. A subcutting edge angle (.beta.), a negative land angle (.theta.) and a negative land width (L) are set at 30.degree. to 60.degree., 30.degree. to 45.degree. and 0.05 to 0.40 mm respectively, while the subcutting edge has a straight shape. Due to this structure, the indexable insert has excellent cutting performance particularly in face milling of parts which are made of gray cast iron, and the tool life can be extended.
Claims20
An indexable insert for use in a milling cutter for face milling, comprising:
- a metal base made of cemented carbide containing WC and Co, and a cutting edge member consisting of a sintered cubic boron nitride compact connected to said metal base,
- wherein said cutting edge member includes a straight-shaped subcutting edge having a subcutting edge angle (.beta.) of at least 30.degree. and not more than 60.degree., includes a flat drag type cutting edge being continuous to said subcutting edge, and has a negative land angle (.theta.) of at least 30.degree. and not more than 45.degree., a negative land width (L) of at least 0.05 mm and not more than 0.40 mm, and a clearance angle (.alpha.) in a range of 5.degree. to 20.degree..
A milling cutter for face milling comprising a plurality of indexable inserts, wherein every one of said plurality of indexable inserts respectively comprises
- a metal base made of cemented carbide containing WC and Co, and
- a cutting edge member consisting of a sintered cubic boron nitride compact that is brazed to or integrally sintered with said metal base,
- wherein said cutting edge member includes a straight-shaped subcutting edge having a subcutting edge angle (.beta.) of at least 30.degree. and not more than 60.degree., includes a flat drag type cutting edge being continuous to said subcutting edge, and has a negative land angle (.theta.) of at least 30.degree. and not more than 45.degree., a negative land width (L) of at least 0.05 mm and not more than 0.40 mm, and a clearance angle (.alpha.) in a range of 5.degree. to 20.degree..
A milling cutter for face milling comprising a plurality of indexable inserts, wherein only some of said plurality of indexable inserts respectively comprise:
- a metal base made of cemented carbide containing WC and Co, and
- a cutting edge member consisting of a sintered cubic boron nitride compact that is brazed to or integrally sintered with said metal base,
- wherein said cutting edge member includes a straight-shaped subcutting edge having a subcutting edge angle (.beta.) of at least 30.degree. and not more than 60.degree., includes a flat drag type cutting edge being continuous to said subcutting edge, and has a negative land angle (.theta.) of at least 30.degree. and not more than 45.degree., a negative land width (L) of at least 0.05 mm and not more than 0.40 mm, and a clearance angle (.alpha.) in a range of 5.degree. to 20.degree..
Dependencies are inferred from the claim text.