Simultaneous Consideration of Process Development and Die Design for Cold Forming a Fuel Injector Nozzle

[+] Author and Article Information
S. Seth

Automated Analysis Corporation, Peoria, IL

R. Shivpuri

Department of Industrial, Welding and Systems Engineering, The Ohio State University, Columbus, OH

J. Manuf. Sci. Eng 119(3), 358-367 (Aug 01, 1997) (10 pages) doi:10.1115/1.2831114 History: Received January 01, 1995; Revised February 01, 1996; Online January 17, 2008


Higher strength and tighter dimensional tolerance is desired for the injector nozzles to attain high injection pressures for lower NOx and particulate emissions. Cold forming is an alternate method which can provide these characteristics replacing the present machining operation. Upset tests were carried out to study the flow stress properties for selecting a suitable material for this part. A knowledge-based system was used to design the die angles and a multi-stage cold forming sequence process to manufacture the injector nozzle. Finite Element Modeling was used to do the punch design and to optimize the punch loads and punch pressures for each stage of the forming process. Initial sequence design was modified based on the results of numerical modeling. The tooling was designed and experimentation was done to verify the formability and material flow.

Copyright © 1997 by The American Society of Mechanical Engineers
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