TOOL MADE OF CUBIC BORON NITRIDE SINTERED BODY

摘要

A tool made of a cubic boron nitride sintered body which has a long life in a stable manner in any application of cutting and plastic working is provided. The tool made of the cubic boron nitride sintered body according to the present invention includes a cubic boron nitride sintered body at least at a tool working point and it is characterized by satisfying an Equation (I) and any one of an Equation (II) and an Equation (III) 20 ≤ X ≤ 98 ... (I) Y ≤ 0.6xX+3 (where 20 ≤ X < 88) ... (II) Y ≤ 5.8xX-455 (where 88 ≤ X ≤ 98)... (III) where a ratio of cubic boron nitride contained in the cubic boron nitride sintered body is denoted as X volume % and thermal conductivity of the cubic boron nitride sintered body is denoted as Y (W/m•K).