CUTTING TOOL FOR MILLING

摘要

A cutting tool for milling comprises an insert consisting of a cubic boron nitride sintered body having heat conductivity of at least 400 W/m~K at 120.degree.C and a thermal expansion coefficient within the range of at least 3.0 x 10 -6/K and not more than 4.0 x 10 -6/K in the temperature range of 20.degree.C to 600.degree.C. According to this cutting tool for milling, sufficient tool life can be attained in high-speed face milling under a wet condition and high-speed end milling under a wet condition.