| 摘要 |
PURPOSE:To provide the titled rationalized apparatus for preventing the generation of cracks and pores at the remelted part due to chill-hardening by rotating and preheating a cam shaft uniformly in an upper side-opened semilunar high- frequency coil, and remelting and hardening the surface of the cam. CONSTITUTION:A cam shaft 50 is supported by pivots 5 and 6 in an upper side- opened semilunar high-frequency coil 9, rotated 7, and uniformly preheated. Then the cam shaft is pivoted on a proximity rotating mechanism 11 by a chuck 10 with a chuck 51 and a pivot 13, and the specified parts of the cam surface 53 are successively remelted, added with metal and hardened by a torch 22. The generation of cracks due to chill-hardening and the generation of pores due to solidification resulting from insufficient venting at the treated part is prevented by the preheating of the cam shaft 50, and the remelting and hardening treatment are carried out with the compact apparatus, in good yield, with high efficiency, and at low cost. |
