Global Patent Index - EP 1005930 A1

EP 1005930 A1 2000-06-07 - Process and device for hydraulic shaping workpieces

Title (en)

Process and device for hydraulic shaping workpieces

Title (de)

Verfahren und Vorrichtung zum hydraulischen Umformen von Werkstücken

Title (fr)

Procédé et dispositif pour former hydrauliquement des pièces

Publication

EP 1005930 A1 (DE)

Application

EP 99123764 A

Priority

DE 19855753 A

Abstract (en)

Fluid high pressure is used to reshape at least one workpiece and the equipment involves a tool with upper and lower parts. The tool clamps the workpiece in edge areas, leaving material flow free. The reshaping tool (21) is enclosed by a separate pressure housing (2). The lower part (3) of the pressure housing has an all-round recess (8) on the inside. The upper part (4) of the pressure housing has a projection with limited thickness which engages in the recess. A seal is fitted between the facing face surfaces of the parts of the pressure housing and locates in grooves (7a). The seal is of the hose type, fillable with pressure medium.

Abstract (de)

Das Innenhochdruckumformen erfolgt derzeit durch Druckausübung zwischen durch eine randseitige Schweißnaht fest verbundene Blechzuschnitte. Es wurde schon vorgeschlagen, in einem kombinierten Spann- und Dichtwerkzeug bloß aufeinander gelegte Blechzuschnitte unter Innenhochdruck zu verformen. Hierbei ergeben sich Dichtigkeits- und Materialfluß probleme. Die Erfindung schlägt daher zur Überwindung der vorgenannten Nachteile ein Verfahren zum Umformen mindestens eines Werkstücks unter Flüssigkeits-Hochdruck vor, bei dem das Werkstück beim Druckaufbau zunächst in an sich bekannter Weise randseitig eingespannt wird und in der Endphase des Umformens zu der gewünschten Endform des Werkstücks (kalibrieren) der Randbereich des Werkstücks freigegeben wird. Sie schlägt weiterhin eine Vorrichtung (1) zum hydraulischen Umformen mindestens eines Werkstücks mittels eines Umformwerkzeugs (21) mit einem Ober- und einem Unterteil (26,24) vor, die das Werkstück in Randbereichen unter Zulassung eines Werkstoffflusses auch lokal unterschiedlich, einspannen, wobei das Umformwerkzeug (21) durch ein von diesem getrennten Druckgehäuse (2), umschlossen ist. <IMAGE>

IPC 1-7 (main, further and additional classification)

B21D 26/02

IPC 8 full level (invention and additional information)

B21D 26/02 (2011.01); B21D 26/025 (2011.01); B21D 26/029 (2011.01); B21D 26/031 (2011.01)

CPC (invention and additional information)

B21D 26/025 (2013.01); B21D 26/02 (2013.01); B21D 26/029 (2013.01); B21D 26/031 (2013.01); Y10T 29/49805 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1005930 A1 20000607; EP 1005930 B1 20031001; AT 250993 T 20031015; DE 19855753 A1 20000608; DK 1005930 T3 20040209; ES 2207105 T3 20040516; PT 1005930 E 20040227; US 6354124 B1 20020312

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