(19)
(11) EP 0 133 687 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.09.1986 Bulletin 1986/38

(43) Date of publication A2:
06.03.1985 Bulletin 1985/10

(21) Application number: 84109179

(22) Date of filing: 02.08.1984
(84) Designated Contracting States:
DE FR GB

(30) Priority: 05.08.1983 JP 14399583

(71) Applicant: NIPPONDENSO CO., LTD.
 ()

(72) Inventors:
  • Ueda, Akio
     ()
  • Morita, Kazuhiro
     ()
  • Tamura, Masami
     ()
  • Kunichika, Susumu
     ()
  • Murao, Toshiaki
     ()
  • Oda, Shinichi
     ()

   


(54) Method and apparatus for expanding heat exchanger tubes


(57) A heat exchanger tube is expanded externally, for instance for connecting it with a plate perimetrically of a hole in the plate through which it passes, by forcing through the bore of the tube a series of at least two expanders of progressively larger size. These expanders are secured on a tool steel rod so far apart from one another than before a trailing expander engages in the bore of the tube, the expander which led it has already emerged from the far end of the tube.






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