Title:
PROPELLER FOR MOTOR BOAT AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP2798344
Kind Code:
B2
Abstract:
PURPOSE: To easily produced the propeller made of aluminum bronze having extremely enhanced strength and high ductility for a motor boat by solidifying a molten metal having a specific compsn. with a ceramic shell casting mold and encapsulating a nonoxidative gas under pressurization into a vacuum vessel, then subjecting the molten metal to hardening and tempering.
CONSTITUTION: The molten metal contg., by weight, 8.5 to 12.5% Al, 3.5 to 6.O% Fe, 3.5 to 6.0% Ni and 0.1 to 2.0% Mn and the balance substantially Cu is poured into the heated ceramic shell casting mold under a vacuum and is cooled. The heating for hardening and tempering is then executed in the vacuum vessel and the cooling in the hardening is executed by pressurizing and encapsulating the nonoxidative gas into the vacuum vessel. The hardness Hv of vane parts 1 of the propeller made of the aluminum bronze for the motor boat produced under such conditions is 230 to 250 and the hardness Hv of a boss part 2 is 220 to 240. Microscopic structures finer than an as-cast state are obtd. This propeller permits easy thickness reducing and bending to a prescribed shape.
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Inventors:
Kazuhiro Watanabe
Hiromi Yuihara
Morikawa Minoru
Kaizu Genji
Kuramoto Koichi
Hiromi Yuihara
Morikawa Minoru
Kaizu Genji
Kuramoto Koichi
Application Number:
JP16100293A
Publication Date:
September 17, 1998
Filing Date:
June 30, 1993
Export Citation:
Assignee:
株式会社日立製作所
ナカシマプロペラ株式会社
ナカシマプロペラ株式会社
International Classes:
B22C9/04; B22C9/24; B22D29/00; B63H1/14; C22C9/01; C22F1/00; C22F1/08; (IPC1-7): C22F1/08; B63H1/14
Domestic Patent References:
| JP6415263A | ||||
| JP629761A | ||||
| JP1147044A | ||||
| JP1176057A |
Attorney, Agent or Firm:
Yusuke Hiraki