[54] METHOD FOR MANUFACTURING A ROTOR FOR A ROTARY FLUID PUMP
[75] Inventors: Hiroshi Sakamaki, Tochigi; Susumu Sugishita; Yukio Horikoshi, both of Saitama, all of Japan
[73] Assignee: Nippon Piston Ring Co., Ltd., Japan
[21] Appl. No.: 691,866
[22] Filed: Jan. 16, 1985
Related U.S. Application Data
[62] Division of Ser. No. 610,664, May 16, 1984. [30] Foreign Application Priority Data
May 20, 1983 [JP] Japan 58-88928
[51] Int. CI.* B23P 15/00; B22D 19/14;
F01C 21/00; F04C 15/00
[52] U.S. CI 29/156.8 R; 29/156.4 R;
29/419 R; 29/419 G; 29/527.5; 29/527.6; 29/530; 29/DIG. 5; 29/DIG. 18; 164/97;
418/152; 418/179; 418/236
[58] Field of Search 29/156.4 R, 156.8 R,
29/419 R, 419 G, 527.5, 527.6, 530, DIG. 5, DIG. 18; 164/97; 418/179, 236, 238, 270, 152
[56] References Cited
U.S. PATENT DOCUMENTS
2,455,303 11/1948 Grate 418/152 X
3,282,222 11/1966 Raufeisen et al 418/236 X
4,198,195 4/1980 Sakamaki et al 418/152 X
4,216,682 8/1980 Ban et al 164/97 X
4,318,438 3/1982 Ban et al 164/97
4,506,721 3/1985 Ban et al 164/97
FOREIGN PATENT DOCUMENTS
78301 12/1970 German Democratic
Rep 418/152
16075 2/1979 Japan 418/152
151087 9/1982 Japan 418/179
278382 12/1927 United Kingdom 418/179
Primary Examiner—Howard N. Goldberg
Assistant Examiner—Ronald S. Wallace
Attorney, Agent, or Firm—Finnegan, Henderson,
Farabow, Garrett & Dunner
[57] ABSTRACT
A rotor for a rotary compressor having a metal central portion integral with two opposite end portions that are fiber-reinforced metal matrix composites having a matrix metal common to the central portion. Such rotors may be made by pressing inorganic fibers to form the end portions of the rotor, arranging the end portions in an opposing relationship in a mold to form the central portion between the end portions. Molten metal is placed into the mold such that it infiltrates the porous end portions while forming the central portion. Solidification of the metal forms fiber-reinforced metal-matrix composite end portions integral with the central portion.
6 Claims, 8 Drawing Figures
