| 摘要 |
PURPOSE:To easily and inexpensively prepare a capstan having long life and excellent tape driving capacity, by a method wherein nitriding treatment is applied to the surface of a capstan substrate comprising stainless steel and barrel grinding treatment is applied to the entire surface of the treated substrate. CONSTITUTION:Nitriding treatment is applied to the entire surface of a capstan substrate comprising stainless steel subjected to centerless grinding to form a high hardness surface having minute recessed and protruded parts with surface hardness Hkc of about 70 or more and surface roughness of about 0.5-1.0S. In the next step, the capstan substrate after nitriding treatment is put in a cylinder along with grinding material to perform barrel grinding to remove the oxide film on the surface thereof and a capstant 5 having a rough surface of which the heights of the protruded parts of the minute recessed and protruded parts are made almost constant is obtained. A capstan drive part obtained by using this capstan 5 generates sufficient tape driving force when a pinch roller is contacted with a tape under pressure and abrasion of a bearing part 4 is reduced while good rotary preciseness can be maintained over a longtime. |
