Global patent index - EP 0970765 A2

EP 0970765 A2 2000-01-12 - Method for forming a workpiece by flow-turning

Title (en)

Method for forming a workpiece by flow-turning

Title (de)

Verfahren zum Umformen eines Werkstücks durch Drückwalzen

Title (fr)

Procédé pour former une pièce par fluotournage

Publication

EP 0970765 A2 (DE)

Application

EP 99112960 A

Priority

DE 19830817 A

Abstract (en)

[origin: DE19830817A1] A cup-shaped blank is axially tensioned against a tool chuck and pressed against it via a roll body. At the start of the forming process, the roll body is pressed against a cylinder wall section (39) at the open end (35) of the blank (18), and then executes an axial relative forming movement over the wall section to the base (33) of the blank. An internal toothing is formed in the cylinder wall section, of an axial length, which is shorter than the length of that wall section. The toothing is at a defined distance (46) to the base of the blank.

Abstract (de)

Die Erfindung betrifft ein Verfahren zum Umformen eines Werkstücks durch Drückwalzen, insbesondere zum Herstellen einer Innenverzahnung an dem Werkstück, bei dem eine topfförmige Vorform axial gegen ein Werkzeugfutter gespannt und mittels mindestens einem Wälzkörper an das Werkzeugfutter angedrückt wird und die Vorform relativ zu dem Wälzkörper rotiert, wobei der zumindest eine Wälzkörper zu Beginn der Umformung am offenen Ende der Vorform gegen ihren Zylinderwandbereich angedrückt wird und in axialer Relativbewegung über den Zylinderwandbereich zum Boden der Vorform hin in Umformkontakt geführt wird. <IMAGE>

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

B21H 5/02

IPC 8 full level (invention and additional information)

B21D 22/14 (2006.01); B21D 22/16 (2006.01); B21D 53/28 (2006.01); B21H 5/02 (2006.01); B21J 5/12 (2006.01); B21K 1/30 (2006.01); B21H 7/18 (2006.01)

CPC (invention and additional information)

B21H 5/025 (2013.01); B21D 53/28 (2013.01); B21J 5/12 (2013.01); B21K 1/30 (2013.01); B21H 7/187 (2013.01)

Citation (applicant)

DE 19636567 A1

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

DE 19830817 A1 19981210; DE 19830817 B4 20110609; CA 2275559 A1 20000109; EP 0970765 A2 20000112; EP 0970765 A3 20000524; EP 0970765 B1 20041006; JP 2000024749 A 20000125; US 2001001367 A1 20010524; US 6269670 B2 20010807

INPADOC legal status

2012-05-10 [REG DE R119] APPLICATION DEEMED WITHDRAWN, OR IP RIGHT LAPSED, DUE TO NON-PAYMENT OF RENEWAL FEE

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2004-07-21 [RAP1] TRANSFER OF RIGHTS OF AN EP APPLICATION

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2003-07-02 [18D] DEEMED TO BE WITHDRAWN

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