ABRASIVE MATERIAL, POLISHING TOOL USING THIS ABRASIVE MATERIAL AND MANUFACTURE OF SHARP MEMBER BY THIS ABRASIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a polishing tool sharp and excellent in durability and free to extensively use by containing a leather grinding pad covered with a leather grinding material as well as an edge having a specific range of a recovery factor against a residual recession and a saw-tooth blade. SOLUTION: A leather grinding pad is covered with a leather grinding material containing 50-80 wt.% of abrasive particles of a grain size with an ethylene copolymer as a base. An olefinic thermoplastic resin is added. With an abrasive containing the leather grinding pad. Additionally, a flat pad can be injection molded, made into a ring body or in a disc shape, and it is injection molded on a rigid core bar as the ring body for honing and leather grinding and a rotary disc to be driven in the axial direction. A new material 13 for a disc 15 is used to make a knife 4 having a cutting surface 11 along an edge having a 30-60% recovery factor against a residual recession an ultrasharp edge, and the edge at a position 14 deforms an abrasive additive 13. A blade surface is held at an angle larger than an angle V of the blade surface so that it makes partially contact with a surface.