PRODUCTION OF WIRE INCRUSTED WITH CUBIC BORON NITRIDE

摘要

PURPOSE:To prevent the generation of chipping on the surface in the central part of a cylindrical metallic body and to extend the life of a wire by mounting a metallic pipe or thin film to the central part in a production process for packing and hermetically sealing a mixture composed of metallic powder and CBN particles into the space between the outermost peripheral part and central part of said body and subjecting the body to hot working, etc. CONSTITUTION:A pipe-shaped metallic body B is inserted into the space S of the cylindrical metallic body A of a required size provided with the space S between the outermost peripheral part 1 and the central part 2 in such a manner that said body is held in tight contact with the central part 2 so as to make the space with the outermost peripheral part 1. A thin metallic strip may be otherwise wound in the central part 2. The powder mixture D composed of the metallic powder 4 and the CBN (cubic boron nitride) particles 3 is packed into the space S' between the metallic body B and the outermost peripheral part 1 and both ends of the metallic body A are hermetically closed. Such metallic body A is subjected to hot working such as extruding or rolling and to a heat treatment such as annealing or patenting and is further drawn by cold working to the wire of a desired wire diameter.