| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To simply and easily produce a boss member excellent in the wear resistance and the weldability. <P>SOLUTION: High frequency induction-heating is discontinuously applied to a plurality of positions in the end surfaces of the boss member composed of a low carbon steel, and the partial hardened boss member is produced by performing air-cooling to these heated parts. In the high frequency induction-heating and hardening, these parts are heated under condition of 10 to 50 kHz frequency,≥16kW output of the electric source and≤1 sec heating time, and it is desirable to set the length of each partial hardening part to be 5 to 30 mm, the width of each partial hardening part to be 3 to 7 mm, and the distance between the nearest portions in respective hardened parts to be≥1 mm. <P>COPYRIGHT: (C)2004,JPO</p> |
