SURFACE-COATED SINTERED HARD ALLOY DRILL

摘要

PURPOSE:To lengthen the life of a drill by forming a coating film with hard boron nitride in the surface-coated sintered hard alloy drill to be used for drilling a laminated printed-wiring board. CONSTITUTION:A sintered hard alloy drill is held in a vacuum vessel, hydrocarbon is decomposed in the hydrogen plasma excited through RF in the case of microwave and a diamond coating film is precipitated on the drill surface, that is, the drill is coated with diamond. With this constitution, the life of the drill is lengthened and drilling efficiency is improved.