Sumitomo Electric Industries, Limited

Masuo Chudo

Toshio Nomura

Mitsunori Kobayashi

Katsuya Uchino

Hisanori Ohara

Toshihiro Iida

A coated cemented carbide member includes a cemented carbide base material containing a binder metal of at least one iron family metal and a hard phase, and a coating layer provided on the surface of the cemented carbide base material. The hard phase contains at least one metal component selected from carbides, nitrides, carbo-nitrides and carbonic nitrides of Zr and/or Hf and WC. A layer consisting of only WC and an, iron family metal or a binder phase enriched layer or a low hardness layer is provided on an outermost surface of each insert edge portion of the cemented carbide base material. The coating layer is a single or multiple layer consisting of at least one metal component selected from carbides, nitrides, carbo-nitrides, oxides and borides of metals belonging to the groups IVB, VB and VIB of the periodic table. Due to this structure, it is possible to improve chipping resistance with no deterioration of wear resistance in the coated cemented carbide member to be used, for example, as a cutting tool.

Coated cemented carbide member

Coated cutting tool and a process for the production of the same

A coated cemented carbide member includes a cemented carbide base material containing a binder metal of at least one iron family metal and a hard phase, and a coating layer provided on the surface of the cemented carbide base material. The hard phase contains at least one metal component selected from carbides, nitrides, carbo-nitrides and carbonic nitrides of Zr and/or Hf and WC. A layer consisting of only WC and an iron family metal or a binder phase enriched layer or a low hardness layer is provided on an outermost surface of each insert edge portion of the cemented carbide base material. The coating layer is a single or multiple layer consisting of at least one metal component selected from carbides, nitrides, carbo-nitrides, oxides and borides of metals belonging to the groups IVB, VB and VIB of the periodic table. Due to this structure, it is possible to improve chipping resistance with no deterioration of wear resistance in the coated cemented carbide member to be used, for example, as a cutting tool.

A coated cemented carbide tool insert with a lengthened life is provided which comprises a substrate of a cemented carbide and a coating film provided thereon consisting of one or more layers of 2 to 20 .mu.m in thickness, each consisting of a compound with a higher hardness than the substrate, in which at least the surface of the coating film, on and near the ridgeline of cutting tip, of the surfaces of the tool is substantially composed of a smooth surface with a surface roughness Rmax of at most 0.2 .mu.m to the standard length of 5 .mu.m.

Coated cemented carbide tool

A cemented carbide article or part having a hard coating excellent in heat shielding effect and initial wear resistance is described in which the hard coating comprises an inner layer of TiC and an outer layer of TiC, and an intermediate layer, provided between the inner layer and outer layer, consisting of at least one layer selected from the group consisting of a single layer of TiN and a composite layer with such a structure that a TiN layer is sandwiched in between TiCN layers.

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Itami, Japan

Masuo Chudo