Nut, female thread machining device and female thread machining method
AssigneeHonda Motor Co., Ltd.
InventorsYota Eguchi, Hiroki Fujuchi, Naoki Takahashi, Toshihiro Murakawa
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Abstract
There is provided a nut having a thread portion having a female thread, a metallic plate portion having a base segment, and a hardness gradient portion provided between the thread portion and the metallic plate portion. The thread portion, metallic plate portion and the hardness gradient portion are monolithic each other, a metallographic structure of the metallic plate portion differs from a metallographic structure of the thread portion and a hardness of the hardness gradient portion is lower than a hardness of the thread portion and lowers from the thread portion toward the metallic plate portion.
Claims3
A nut comprising:
- a thread portion having a female thread;
- a metallic plate portion having a base segment;
- and
- a hardness gradient portion provided between the thread portion and the metallic plate portion,
- wherein
- the thread portion, metallic plate portion and the hardness gradient portion are monolithic each other,
- a metallographic structure of the metallic plate portion differs from a metallographic structure of the thread portion,
- a hardness of the hardness gradient portion is lower than a hardness of the thread portion and lowers from the thread portion toward the metallic plate portion,
- the thread portion contains bainite as a main component,
- the base segment contains cementite and ferrite as a main component,
- the hardness gradient portion contains cementite and ferrite as a main component, and
- a metallographic structure of the ferrite in the hardness gradient portion becomes more microscopic from the thread portion to the metallic plate portion.
Dependencies are inferred from the claim text.