| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the manufacturing cost in a hardening step and a tempering step, and to prevent the tempering step from being skipped. <P>SOLUTION: An induction hardening and tempering device 1 comprises a common heating coil 4 for hardening and tempering, and a high-frequency power source 5 to heat a rack shaft 2 for hardening or tempering by supplying the high-frequency power to the heating coil 4. In the high-frequency power source 5, the frequency of oscillation and the output are variable. Heating for hardening and heating for tempering are respectively performed by changing the frequency of oscillation, the output, the supply time of the power. A hardening device and a tempering device need not be provided separately, and the cost can be reduced considerably. Because hardening and tempering can be performed by the common heating coil 4, the rack shaft 2 need not be moved between hardening and tempering. Therefore, skipping the tempering step and feeding to the next step of the hardened rack shaft 2 can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
