| 摘要 |
PURPOSE:To manufacture a gear with a boss of a good shape in good yield and with high efficiency by inserting a forming material with bosses into a die hole with a lower tooth form, forming a tooth form on the base material by a guide pressure of an inside punch of a punch and an outside double structure punch, and punching it by the inside punch. CONSTITUTION:A ring hole forming material 40 with boss is inserted into a die 16 hole 16a having a tooth form 16b on the lower part. The material 40 is pressed by an inside punch 28 fitted into a ring hole of a punch, a tip part 28b and an outside double-structure punch 32. As for the material 40, a tooth form 41b is formed on the outside. A punch 28 whose diameter is slightly smaller than the bottom part of the tooth form descends further against a spring 29 and punches a tooth form forming material 41. A ring hole gear with a boss of a good shape is manufactured in a good yield and at high efficiency by its descending process of once. In this regard, as for an elongated part of the tooth form, it will do that it is finished by a lathe.
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