Global Patent Index - EP 0815985 A1

EP 0815985 A1 19980107 - Method and apparatus for the hot-forming of tubular box-type elements of any shape made from a light alloy

Title (en)

Method and apparatus for the hot-forming of tubular box-type elements of any shape made from a light alloy

Title (de)

Verfahren und Vorrichtung zur Warmumformung von kastenförmigen Hohlprofilen irgendeiner Form aus Leichtmetall

Title (fr)

Procédé et dispositif pour le formage à chaud d'éléments tubulaires en forme de caisson de forme quelconque en alliage léger

Publication

EP 0815985 A1 19980107 (EN)

Application

EP 97109605 A 19970612

Priority

IT TO960536 A 19960621

Abstract (en)

Tubular boxes (2) of any shape are made from a light alloy (based on aluminium and/or magnesium for example) by means of a hot-forming method, preferably starting from billets (11) cast in that alloy, which provides a first phase in which the alloy is hot-extruded through a die (14) of suitable shape so as to be formed into a tube (4) of pre-determined section, preferably circular, generally rectilinear, a second phase in which the extruded tube (4), still hot, is fed between two moulds (6,7) which are heated and provided with conjugated cavities capable of defining with their contour the final shape of the box (2), and a third phase in which the extrusion (4) is pressed inside the moulds (6,7) which are brought close together in a fluid-tight manner, by creating a vacuum between extrusion (4) and cavity (8,9), inside the cavities (8,9), and conveying a pressurized gas inside the extrusion (4); during the second phase the moulds (6,7) are kept close together at a certain distance apart from each other so that the cavities define a guide channel for the extrusion (4) inside which it is caused to slide to obtain a pre-form of it; all the phases take place with the alloy kept at the temperature of maximum plasticity. <IMAGE>

IPC 1-7

B21K 21/16; B21D 26/02; B21C 23/14

IPC 8 full level

B21C 23/08 (2006.01); B21C 23/14 (2006.01); B21D 26/02 (2011.01); B21K 21/16 (2006.01); C22C 1/00 (2006.01)

CPC (source: EP)

B21C 23/085 (2013.01); B21C 23/14 (2013.01); B21C 29/006 (2013.01); B21J 5/004 (2013.01); B21K 21/16 (2013.01); C22C 1/12 (2023.01)

Citation (search report)

  • [PX] EP 0727343 A1 19960821 - GEN MOTORS CORP [US]
  • [A] EP 0294034 A2 19881207 - TI AUTOMOTIVE [CA]
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 010, no. 207 (M - 500) 19 July 1986 (1986-07-19)
  • [YA] PATENT ABSTRACTS OF JAPAN vol. 013, no. 013 (M - 783) 12 January 1989 (1989-01-12)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 017, no. 043 (M - 1360) 27 January 1993 (1993-01-27)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 95, no. 002

Designated contracting state (EPC)

DE ES FR GB SE

DOCDB simple family (publication)

EP 0815985 A1 19980107; EP 0815985 B1 20010905; DE 69706482 D1 20011011; DE 69706482 T2 20020516; ES 2163068 T3 20020116; IT 1286118 B1 19980707; IT TO960536 A0 19960621; IT TO960536 A1 19971221

DOCDB simple family (application)

EP 97109605 A 19970612; DE 69706482 T 19970612; ES 97109605 T 19970612; IT TO960536 A 19960621