EP 2320064 A1 20110511 - Method for processing an injection nozzle
Title (en)
Method for processing an injection nozzle
Title (de)
Verfahren zum Bearbeiten einer Einspritzdüse
Title (fr)
Procédé de traitement d'une buse d'injection
Publication
Application
Priority
DE 102009046437 A 20091105
Abstract (en)
The method for operating an injector for marine diesel engine operated with heavy oil, comprises filling recess of the injector serving fuel conduits with a rheopectic fluid or a dilatant fluid and then subjecting with autofrettage pressure so that interior pressure constructs itself in the recess of the injector to increase the duration strength of the injector. The autofrettage pressure is measured in such a way that the injector is plastically deformed in section wise manner in the area of the recess that serves the fuel conduits. The method for operating an injector for marine diesel engine operated with heavy oil, comprises filling recess of the injector serving fuel conduits with a rheopectic fluid or a dilatant fluid and then subjecting with autofrettage pressure so that interior pressure constructs itself in the recess of the injector to increase the duration strength of the injector. The autofrettage pressure is measured in such a way that the injector is plastically deformed in section wise manner in the area of the recess that serves the fuel conduits, and compressive residual stresses remain in the plastically deformed section after the reduction of the autofrettage pressure. The rheopectic fluid or dilatant fluid is additionally used for increasing the duration stability of the injector and also for hydro-erosive filleting of injection holes (5) of the injector in such a way that the fluid is pumped with slight pressure by injection nozzle (1) and the pressure is increased for the flow of the fluid up to the autofrettage pressure after the erosive processing of the injection holes.
Abstract (de)
Die Erfindung betrifft ein Verfahren zum Bearbeiten einer Einspritzdüse, wobei der Kraftstofffüng dienende Ausnehrnungen der Einspritzdüse mit einem rheopexischen Fluid oder einem dilatanten Fluid gefüllt werden, und wobei das Fluid mit einem Autofrettagedruck beaufschlagt wird, sodass sich in den Ausnehmungen der Einspritzdüse ein derartiger Innendruck aufbaut, dass die Dauerschweilfestigkeit der Einspritzdüse erhöht wird.
IPC 8 full level
C21D 7/06 (2006.01); F02M 61/16 (2006.01)
CPC (source: EP)
C21D 7/06 (2013.01); C21D 7/12 (2013.01); F02M 61/168 (2013.01); F02M 2200/8053 (2013.01); F02M 2200/9061 (2013.01)
Citation (applicant)
- DE 102007011868 B3 20080904 - MANNESMANN PRAEZISROHR GMBH [DE]
- DE 3025562 A1 19820211 - BASF AG [DE]
- EP 0174566 B1 19871125
Citation (search report)
- [A] US 2005005913 A1 20050113 - USUI MASAYOSHI [JP], et al
- [A] US 4354371 A 19821019 - JOHNSON DANIEL E
- [A] DE 1583992 B1 19710609 - MANNESMANN AG
- [A] WO 2005049273 A1 20050602 - BOSCH GMBH ROBERT [DE], et al
- [AP] DE 102009000538 A1 20100805 - BOSCH GMBH ROBERT [DE]
Designated contracting state (EPC)
CH FI IT LI
Designated extension state (EPC)
BA ME RS
DOCDB simple family (publication)
EP 2320064 A1 20110511; EP 2320064 B1 20120620; CN 102051459 A 20110511; CN 102051459 B 20130619; DE 102009046437 A1 20110512; DE 102009046437 B4 20180419; JP 2011099435 A 20110519; JP 5722588 B2 20150520; KR 101314932 B1 20131004; KR 20110049662 A 20110512
DOCDB simple family (application)
EP 10174323 A 20100827; CN 201010537323 A 20101105; DE 102009046437 A 20091105; JP 2010230456 A 20101013; KR 20100093845 A 20100928