| 摘要 |
A milling tool 10 having a longitudinal axis A about which the milling tool will rotate in use, comprising a tool body 14 on which a plurality of cutter assemblies 16 are arranged azimuthally, each cutter assembly comprising a plurality of super-hard cutter segments 12attached to the tool body by braze material within helically arranged slots 18. Each cutter segment comprises a super-hard layer (22, fig 1D) bonded to a cemented carbide substrate (24, fig 1D), a cutting face 15 and cutting edge 13 are provided on the superhard layer. The super-hard layer may be formed of polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN) or may comprise chemical vapour deposited (CVD) diamond material or super-hard grains such as grains of diamond or cubic boron nitride (cBN). The tool body and the cutter segments are configured such that the cutting edges define a mean cut diameter D of at least 6 (six) millimetres (mm) and a cut length L of at least 1.5 times the mean cut diameter. A method of manufacture utilizing a pre-form construction and a method of use are also claimed. |
