Global Patent Index - EP 0906800 B1

EP 0906800 B1 20020403 - Method and device for making a hollow shaft having radial bulges by internal high pressure forming

Title (en)

Method and device for making a hollow shaft having radial bulges by internal high pressure forming

Title (de)

Verfahren und Vorrichtung zum Herstellen einer Hohlwelle mit äusseren radialen Erhebungen durch Innenhochdruck-Umformung

Title (fr)

Méthode et dispositif pour la fabrication des arbres creux ayant des bosses radiales par le procédé de formage par pression interne

Publication

EP 0906800 B1 20020403 (DE)

Application

EP 98116383 A 19980829

Priority

DE 19743863 A 19971004

Abstract (en)

[origin: EP0906800A1] The shaft is fabricated from a preformed semi- finished product with outer radial raised parts, in an internal high pressure forming process. To move material into the forming zone during the process when the tool is closed, the raised parts are charged with an axial load. The tool (11) consists of a divided block with internal shaping showing a group of raised parts. A first axial block (16) has an aperture enclosing a raised part (7,5,3), while its end face (18) facing the other axial block (15) loads the next raised part (8). The second block loads the neighboring raised part (9). A central block (12) encloses the semi-finished product (1) between the loaded parts.

IPC 1-7

B21D 53/84; B21D 15/10; B21D 26/02

IPC 8 full level

B21D 15/10 (2006.01); B21D 26/02 (2011.01); B21D 26/047 (2011.01); B21D 53/84 (2006.01)

CPC (source: EP)

B21D 15/10 (2013.01); B21D 26/047 (2013.01); B21D 53/845 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0906800 A1 19990407; EP 0906800 B1 20020403; AT 215412 T 20020415; DE 19743863 A1 19990415; DE 59803596 D1 20020508; ES 2175576 T3 20021116

DOCDB simple family (application)

EP 98116383 A 19980829; AT 98116383 T 19980829; DE 19743863 A 19971004; DE 59803596 T 19980829; ES 98116383 T 19980829