| 摘要 |
PURPOSE:To manufacture a bevel gear by warm forging of a shortened process, by warm forging a blank material, from which scales are removed, after the blank material is heated and a lubricant is supplied, and then, die forging the blank material by heating after a film of a lubricant of the same series as the above-mentioned lubricant is formed on the surface. CONSTITUTION:A round bar material 11a is cut 12 to a desired length and the blank 12 thus obtained is high-frequency heated 14 to about 300-850 deg.C after scales are removed 13 from the blank 12a. Beveling is performed on the heated blank 14a by warm forging 15 by supplying a lubricant which is the same series as the lubricant used for forming a film on the surface of the blank in the next process to the blank 14a or a metallic mold. The beveled blank 15a is dipped in a water-soluble carbon lubricating oil 16 while the blank 15a is maintained at a post-forging temperature of about 100-300 deg.C. The blank 16a coated with a film of the lubricant is high-frequency heated 17 and the blank 17a heated to about 650-900 deg.C is warm forged 18. When the warm forged blank 17a is cooled by air, a bevel gear product 18a is obtained.
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