EP 0549955 B1 19951108 - Method of the fluidised bed type for the shaping of sheet metal.
Title (en)
Method of the fluidised bed type for the shaping of sheet metal.
Title (de)
Verfahren zum Formen von Blech unter hydraulischem Druck.
Title (fr)
Procédé du type à lit fluidisé pour former de la tÔle.
Publication
Application
Priority
IT TO911012 A 19911220
Abstract (en)
[origin: EP0549955A1] The method comprises a first stage during which a blank holder (1) is brought into contact with the sheet (2), a second stage in which a pressurised fluid is fed by means of a first hydraulic circuit to the cavity (4) in a die (3) below the sheet and a third stage in which a punch (7) is displaced towards the sheet to deform it plastically through the combined action of the pressures generated by the punch and the fluid. In accordance with the invention the second pressurised fluid delivered from a second hydraulic circuit is caused to act on the upper surface (9) of at least a portion (10) of the sheet so as to balance out the pressures acting on the undersurface (11) of the said portion while the former is displaced towards the sheet. <IMAGE>
IPC 1-7
IPC 8 full level
B21D 22/20 (2006.01); B21D 26/021 (2011.01); B21D 26/027 (2011.01); B30B 5/00 (2006.01)
CPC (source: EP)
B21D 22/205 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0549955 A1 19930707; EP 0549955 B1 19951108; BR 9204920 A 19940628; DE 69205959 D1 19951214; DE 69205959 T2 19960711; IT 1250551 B 19950420; IT TO911012 A0 19911220; IT TO911012 A1 19930621; JP H05245546 A 19930924; PL 169841 B1 19960930; PL 297058 A1 19930906
DOCDB simple family (application)
EP 92121405 A 19921216; BR 9204920 A 19921202; DE 69205959 T 19921216; IT TO911012 A 19911220; JP 33909192 A 19921218; PL 29705892 A 19921218