(19)
(11) EP 0 326 008 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.10.1990 Bulletin 1990/40

(43) Date of publication A2:
02.08.1989 Bulletin 1989/31

(21) Application number: 89100817.9

(22) Date of filing: 18.01.1989
(51) International Patent Classification (IPC)4: B21C 23/20, B21C 23/21
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 26.01.1988 IT 1921588

(71) Applicant: INNSE INNOCENTI ENGINEERING S.p.A.
I-16121 Genova (IT)

(72) Inventor:
  • Zurru, Sergio
    I-20097 San Donato Milanese Milan (IT)

(74) Representative: Vannini, Torquato et al
c/o JACOBACCI & PERANI S.p.A. Via Visconti di Modrone, 7
20122 Milano
20122 Milano (IT)


(56) References cited: : 
   
       


    (54) A method for improving the backward extrusion rate of brass billets and the like, and an apparatus for the implementation thereof


    (57) To improve the rate of backward extrusion of brass billets and the like, a horizontal extrusion press is provided with two parallel tubular headers (25,26) to which respective extrusion dies (29,30) are affixed permanently and which are mounted on slides (27,28) adapted to be driven in a guided fashion perpendicularly to the extrusion axis (X-X) of the press; one header (25) is set at an operative position for extrusion aligned to the extrusion axis (X-X), and the other header (26) set at an inoperative position laterally of the axis (X-X), and a billet is extruded with said one header (25) to form a residual brass jacket (36) around the header; on completion of the extrusion step, the positions of the headers (25,26) are reversed, and said one header (25) is cleared of the residual brass jacket (36) in the inoperative position, while another billet is simultaneously extruded with said other header (26).







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