Cutter elements, rotary machine tools comprising same and method for making same

摘要

A cutter element (100) for a rotary machine tool having an axis of rotation, the cutter element comprising a plurality of cutting edges (110) defined by at least one cutter structure (120) comprising superhard material, consecutive cutting edges being spaced apart by at most 10 mm and configured operable to cut a body when moved in a direction that is substantially non-aligned with the axis of rotation.

主权项

1. A cutter element for a rotary machine tool having an axis of rotation in use, the cutter element comprising at least three cutting edges configured operable to cut a body when moved in a direction that is substantially non-aligned with the axis of rotation, and defined by at least one cutter structure comprising electro-discharge machine cuttable polycrystalline boron nitride (PCBN) material, the PCBN material comprising at least 80 volume per cent cubic boron nitride grains dispersed in a binder matrix comprising compounds containing cobalt and tungsten, wherein the tool has a lateral cross-section diameter of 10 to 25 mm, and wherein consecutive cutting edges are spaced apart by at most 5 mm azimuthally about the axis of rotation, and wherein the cutter structure is joined to a cemented carbide substrate by an intermediate layer between the cutter structure and the substrate, the intermediate layer comprising grains of metal carbide and grains of cubic boron nitride dispersed in a matrix material.