Polycrystalline cubic boron nitride blanks for the cutting tool are compound super-hard material of polycrystalline cubic boron nitride layer and WC sintered under ultrahigh pressure and high temperature. It has the hardness, wear-resistance, and thermal stability of cubic boron nitride and the shock-resistant toughness of hard alloy. It is the ideal material for cutting the processing of high-hard ferrous metals and nonferrous metal alloy. PCBN has an excellent performance in processing cast iron and processing work。