EP 1088901 B1 20021009 - Process for the thermal treatment of metallic workpieces
Title (en)
Process for the thermal treatment of metallic workpieces
Title (de)
Verfahren zur Wärmebehandlung metallischer Werkstücke
Title (fr)
Procédé pour le traitement thermique de pièces métalliques
Publication
Application
Priority
- EP 99118920 A 19990924
- CA 2341152 A 20010321
- CN 01112301 A 20010402
- JP 2001096006 A 20010329
Abstract (en)
[origin: EP1088901A1] Heat treating metallic workpieces comprises producing a cooling gas stream using a ventilator in an evacuated quenching chamber of a single or multiple chamber furnace. The ventilator is operated by a rotary current motor which is operated above the lowest pressure for the motor output in the quenching chamber with a prescribed supply voltage. The ventilator is started at a pressure in the chamber which is lower than the lowest pressure and the rotary current motor is operated until it achieves the lowest pressure in the chamber with a second lower supply voltage. Preferred Features: The rotary current motor is operated above the lowest pressure with a supply voltage of approximately 400 V and below the lowest pressure with a supply voltage of approximately 230 V.
IPC 1-7
IPC 8 full level
C21D 1/00 (2006.01); C21D 1/18 (2006.01); C21D 1/767 (2006.01); C21D 1/773 (2006.01); C21D 9/00 (2006.01); C21D 1/613 (2006.01)
CPC (source: EP US)
C21D 1/767 (2013.01 - EP US); C21D 9/0006 (2013.01 - EP US); C21D 1/613 (2013.01 - EP US); C21D 1/773 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 1088901 A1 20010404; EP 1088901 B1 20021009; AT E225862 T1 20021015; CA 2341152 A1 20020921; CA 2341152 C 20090901; CN 1227378 C 20051116; CN 1377978 A 20021106; DE 59903032 D1 20021114; ES 2184376 T3 20030401; JP 2002294333 A 20021009; JP 5178975 B2 20130410; US 6428742 B1 20020806
DOCDB simple family (application)
EP 99118920 A 19990924; AT 99118920 T 19990924; CA 2341152 A 20010321; CN 01112301 A 20010402; DE 59903032 T 19990924; ES 99118920 T 19990924; JP 2001096006 A 20010329; US 65399300 A 20000901