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US 7,732,066 B2Granted
Surface-coated machining tools
AssigneeSumitomo Electric Industries, Ltd.
InventorsHaruyo Fukui, Tatsuro Fukuda
Life of this patent
Estimating the term…
Abstract
Surface-coated machining tools in particular utilized in routing, slitting and drilling processes on printed circuit boards onto which integrated circuits and various electronic parts are populated. A cemented-carbide base material containing tungsten carbide and cobalt, with the cobalt inclusion amount being 4 weight % or more and 12 weight % or less, is furnished. A compound thin film made up of a combination of one or more elements selected from the group titanium, chromium, vanadium, silicon and aluminum, and one or more selected from carbon and nitrogen, is coated over the cemented-carbide base material. The compound thin film is coated in at least a single layer.
Claims10
A router cutter consisting of:
- a machining tool shank having a blade portion of 3.175 mm or less diameter, the blade portion fabricated from a cemented-carbide base material containing tungsten carbide and cobalt, with the cobalt inclusion amount being 4 weight % or more and 12 weight % or less;
- and
- coated to a given thickness in a single layer over said cemented-carbide base material, a compound thin film made up of a combination of, in given elemental proportions, one or more elements selected from the group, chromium, vanadium, silicon and aluminum, and one or more elements selected from carbon and nitrogen;
- wherein
- said compound thin film is vapor-deposited onto said base material under reaction-gas pressure, base-material bias voltage, and deposition-temperature conditions that, together with said given thickness and said given elemental proportions, are predetermined so as to impart a compressive residual stress of 0.1 GPa or more and 8 GPa or less to said compound thin film,
- said compound thin film has a surface roughness of 0.01 μm or more and less than 0.3 μm by indication Ra, and
- said predetermined thickness of said compound thin film is 0.05 μm or more and less than 1.5 μm.
4 more elements
A miniature drill for processing printed circuit boards, the miniature drill consisting of:
- a machining tool shank having a blade portion of 3.175 mm or less diameter, the blade portion fabricated from a cemented-carbide base material containing tungsten carbide and cobalt, with the cobalt inclusion amount being 4 weight % or more and 12 weight % or less;
- and
- coated to a given thickness in a single layer over said cemented-carbide base material, a compound thin film made up of a combination of, in given elemental proportions, one or more elements selected from the group, chromium, vanadium, silicon and aluminum, and one or more elements selected from carbon and nitrogen;
- wherein
- said compound thin film is vapor-deposited onto said base material under reaction-gas pressure, base-material bias voltage, and deposition-temperature conditions that, together with said given thickness and said given elemental proportions, are predetermined so as to impart a compressive residual stress of 0.1 GPa or more and 8 GPa or less to said compound thin film,
- said compound thin film has a surface roughness of 0.01 μm or more and less than 0.3 μm by indication Ra, and
- said predetermined thickness of said compound thin film is 0.05 μm or more and less than 1.5 μm.
4 more elements
A router cutter comprising:
- a cemented-carbide base material of 3.175 mm or less blade-portion diameter and containing tungsten carbide and cobalt, the cemented-carbide base material having a bulk cobalt concentration of 4 weight % or more and 12 weight % or less, the cemented-carbide base material including a cutting surface;
- a hard carbon thin film made up essentially of carbon atoms only, coated to a thickness in the range of 0.05 to 0.2 μm over the cutting surface of said cemented- carbide base material by a physical vapor deposition method in which graphite is made a raw material, and under reaction-gas pressure, base-material bias voltage, and deposition-temperature conditions that, together with said given thickness, are predetermined so as to impart a compressive residual stress of 0.1 GPa or more and 1 GPa or less to said compound thin film;
- wherein
- the hard carbon thin film consists of a single layer deposited on the cemented-carbide base material such that substantially the entire hard carbon thin film is in direct contact with the cemented-carbide base material, and
- the hard carbon thin film is surface roughness adjusted to be 0.01 μm or more and 0.5 μm or less by indication Ra.
2 more elements
A miniature drill for processing printed circuit boards, the miniature drill comprising:
- a cemented-carbide base material of 0.3 mm or less blade-portion diameter and containing tungsten carbide and cobalt, the cemented-carbide base material having a bulk cobalt concentration of 4 weight % or more and 12 weight % or less, the cemented-carbide base material including a cutting surface;
- a hard carbon thin film made up essentially of carbon atoms only, coated to a thickness in the range of 0.05 to 0.2 μm over the cutting surface of said cemented- carbide base material, by a cathodic-arc deposition method in which graphite is made a raw material, and under reaction-gas pressure, base-material bias voltage, and deposition-temperature conditions that, together with said given thickness, are predetermined so as to impart a compressive residual stress of 0.1 GPa or more and 1 GPa or less is imparted to said hard carbon thin film;
- wherein
- the hard carbon thin film consists of a single layer deposited on the cemented-carbide base material such that substantially the entire hard carbon thin film is in direct contact with the cemented-carbide base material, and
- the hard carbon thin film is surface roughness adjusted to be 0.01 μm or more and 0.5 μm or less by indication Ra.
2 more elements
Dependencies are inferred from the claim text.