(19)
(11) EP 0 416 418 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.06.1992 Bulletin 1992/24

(43) Date of publication A2:
13.03.1991 Bulletin 1991/11

(21) Application number: 90116371.7

(22) Date of filing: 27.08.1990
(51) International Patent Classification (IPC)5: C21C 1/08, C22C 37/08
(84) Designated Contracting States:
DE GB

(30) Priority: 08.09.1989 JP 231732/89

(71) Applicants:
  • NISSAN MOTOR CO., LTD.
    Yokohama City (JP)
  • NIPPON PISTON RING CO., Ltd.
    Chiyoda-Ku Tokyo 102 (JP)

(72) Inventors:
  • Kano, Makoto, c/o NISSAN MOTOR COMPANY, LIMITED
    Yokohama (JP)
  • Tanimoto, Ichiro, c/o NISSAN MOTOR COMPANY LIMITED
    Yokohama (JP)
  • Kawamura, Osamu, c/o NIPPON PISTON RING CO. LTD.
    Shimotsuga-gun, Tochigi-ken (JP)
  • Takahashi, Teruo, c/o NIPPON PISTON RING CO. LTD.
    Shimotsuga-gun, Tochigi-ken (JP)

(74) Representative: Dost, Wolfgang, Dr.rer.nat., Dipl.-Chem. et al
Patent- und Rechtsanwälte Bardehle . Pagenberg . Dost . Altenburg . Frohwitter . Geissler & Partner Postfach 86 06 20
81633 München
81633 München (DE)


(56) References cited: : 
   
       


    (54) Method of making rocker arm


    (57) In a process of casting a rocker arm as one piece from high chrome cast iron, a Ca-Si base addition agent is added to the molten metal in an amount of 0.3 to 0.6% by weight. The agent is effective as a globulizer to round high-hardness carbide precipitates directing toward the casting surface.







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