To provide a tapered screw member for securing the area of the end face of a tapered portion for improved sealing performance while holding the strength of the end of the tapered portion, and to provide its manufacturing method for easily machining a screw while uniformly holding the thickness of the tapered portion.
The tapered screw member is manufactured which has a male screw formed on the outer peripheral face of a tapered member having the tapered portion at the end. In this case, pressing or cutting work is applied to the end of a metal cylinder body 14 to produce the tapered member having the tapered portion 12 tapered with its diameter gradually shrunk toward the end side and its thickness uniform. Then, the male screw is machined on the outer peripheral face of the tapered portion 12 of the obtained tapered member to manufacture the tapered screw member. The angle of inclination of the tapered portion 12 is preferably 1-3. The male screw is preferably machined with rolling work. The cylinder body 14 is preferably formed of stainless steel.
| JP5919099 | Cleaning system |
HORI MAKOTO
YOSHIDA KAZUYOSHI
Makoto Onda
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