| 摘要 |
<p>PURPOSE:To reduce in balance a tensile residual stress at the surface of a cam so as to restrain pitching or the like in a cam nose by re-fusing the surface of the cam, and applying a surface process to the surface of the cam after grinding so as to generate a compression residual stress therein to cancel these stresses each other. CONSTITUTION:In manufacturing, a cam shaft material 1 made of cast iron is fused, and the surface of a cam is cutting worked, followed by a degreasing treatment. After adhesion of an alloy powder sheet 2 to the surface of the cam, the cam shaft material 1 is heated and dewaxed. The cam shaft material 1 is pre-heated, and an abrasion resistant high alloy chill layer 12 is formed by thermal energy of a beam 3 of TIG welding. The abrasion resistant high alloy chill layer 12a is formed by grinding after a high alloy re-fusion process, and then the surface of the layer 12a is hardened by shot peening. Therefore, a compression residual stress can be generated in a cam nose after the shot peening, and further, a surface smoothing effect can be obtained.</p> |
