In the last years the demands on the technological properties of steels in fuel injection systems are constantly increasing. There has been for instance a significant increase in the pressure of fuel injections systems. This means even small imperfections in steels can lead to field failures. The grades 47Pb2 and 42CrMo4 for fuel injection systems have stringent requirements regarding the production and application of the components. In order to obtain the best possible quality all stages of the production system have to be monitored very carefully. The steel making process in the steel plant has to follow strict rules to avoid detrimental oxide inclusions, reduce segregation, improve lead distribution, provide a good surface quality and homogeneous structure. The process of manufacturing bright steels bars from the hot rolled wire rods also involves capable processes with intensive 100% testing of all the bars supplied to the customer. The wire rods are drawn to bars and ground to narrow tolerances. The bars undergo an eddy current test to determine surface defects and also a sophisticated ultra sonic test at a flat bottom hole of 0.7. In spite of all the process monitoring and tests carried out from the melting up to grinding the bars there is still a chance of certain imperfections or defects remaining on the bars, which are more likely detectable on processing the bars to components. Therefore there is also a necessity to carry out a test during the stage of component manufacturing.
Production and quality assurance of bright steel products for high performance components in fuel injection systems
Produktion und Qualitätssicherung von Blankstahlprodukten für hochwertige Bauteile in Kraftstoffeinspritzsystemen
2005
8 Seiten, 13 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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