Coated hard metal tool

Details Coated hard metal tool Coated hard metal tool

1997-06-09

2000-07-04

Tsai, Henry W. H.

Cutters, for shaping

Comprising tool of specific chemical composition

407118, 407120, B23B 2714

Patent

active

060829362

ABSTRACT:
A coated hard metal tool includes a hard metal base material having an edged part on an insert ridge portion defining a connecting portion between a flank and a rake face, and a coating film applied to a surface of the hard metal base material. The coating film has a surface-treated part on the insert ridge portion. The coating film is so formed that Rc1/(Rs1+d)<1.0 and Rc2/(Rs2+d)>1.0, wherein Rs1 represents the radius of curvature of a convex curved surface formed on the boundary between the flank and the edged part on the surface of the hard metal base material, Rc1 represents the radius of curvature of a convex curved surface formed on the boundary between the flank and the surface-treated part, Rs2 represents the radius of curvature of a convex curved surface formed on the boundary between the rake face and the edged part on the surface of the hard metal base material, Rc2 represents the radius of curvature of a convex curved surface formed on the boundary between the rake face and the surface-treated part, and d represents the average thickness of the coating film in a region other than the edged part. According to this structure, a coated hard metal tool having a long life which is improved in wear resistance with no damage on its breakage resistance can be provided.

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patent: 5681651 (1997-10-01), Yoshimura et al.
patent: 5750247 (1998-05-01), Bryant et al.

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