Polycrystalline Diamond Cutting Tool with Coated Body
AssigneeGM Global Technology Operations LLC
InventorsXingcheng Xiao, Michael J. Lukitsch, Anil K. Sachdev, Leonid C. Lev
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Abstract
A cutting tool for machining metal workpieces using polycrystalline diamond cutting surfaces with interspersed guide surfaces and chip evacuation surfaces. When machining holes in cast aluminum alloy workpieces it is found that aluminum machining chips adhere to guide surfaces and chip evacuation surfaces and mar the machined surface. It is found that when the guide and chip evacuation surfaces are coated with a diamond-like carbon material, aluminum chips do not mar the machined surfaces.
Claims20
A metal cutting tool for non-ferrous alloy workpieces comprising:
- a cutting edge, for removal of metal machining chips from a workpiece to form a machined surface;
- and
- a non-cutting surface along which machining chips are removed from the workpiece, the non-cutting surface comprising a coating to prevent adherence of the machining chips;
- and
- wherein the coating comprises at least one material selected from the group consisting of diamond material, diamond-like carbon material, metal-containing diamond-like carbon material, titanium diboride material, and nanocomposite tungsten carbide/carbon material.
A tool for machining inner diameters of holes in non-ferrous alloy workpieces, the tool being rotatable at a machining rate of rotation, the tool comprising:
- a round body with an axis of rotation, a tool holder portion at one end of the round body, and a machining portion at the other end of the round body;
- the machining portion comprising:
- opposing cutting surfaces in the circumference of the machining portion for removal of machining chips from the workpiece,
- guide surfaces for guiding the tool in the hole, and
- chip removal flutes,
- wherein at least one of the guide surfaces and the chip removal flutes are coated with diamond-like carbon material or hydrogenated diamond-like carbon material to prevent adherence of the metal machining chips to the guide surfaces and the chip removal flutes.
A method of machining cast non-ferrous alloy workpieces with a rotating cutting tool comprising cutting edges for removing machining chips from the workpiece, guide surfaces to guide the tool along the machined surface, and chip evacuation surfaces for evacuation of the chips, the method comprising:
- coating at least one of the guide surfaces and the chip evacuation surfaces of the rotating cutting tool with diamond-like carbon to reduce adherence of machining chips to the guide and chip evacuation surfaces;
- and, thereafter
- machining the non-ferrous alloy workpieces with the rotating cutting tool having coated guide and chip evacuation surfaces.
Dependencies are inferred from the claim text.