| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for selectively carburizing (tailored carburizing) a steel gear or similar ferrous metal object. SOLUTION: The process of the present invention includes two similar but separate methods. The first method includes the steps of: first, masking the roots of the gear with an appropriate masking material; and conducting a first carburizing operation of the gear. Then, the masking material is removed from the gear roots and a second carburizing operation of the gear is conducted. The resulting carburized gear has a lighter case with a lower carbon content in the root areas of the gear. The second method includes the steps of masking the root areas of the gear with a coating material which would inhibit carbon diffusion in the root areas but not completely stop it. Then, the gear is carburized. Finally, the inhibiting agent is removed. The resulting carburized gear will have a lighter case with a lower carbon content in the root areas of the gear. COPYRIGHT: (C)2007,JPO&INPIT
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