Drawing stainless steel 304 micro cups through multi-stage draw
by Paritala, Phani Kumari, M.S., NORTHERN ILLINOIS UNIVERSITY, 2009, 139 pages; 1467980

Abstract:

Due to the trend of miniaturization, the need for micro metallic components is being tremendously increased. Among all manufacturing processes, metal forming is the most cost-effective way to produce metallic parts in mass production. However, the concepts and knowledge developed in macro scale cannot be directly applied to the micro scale due to the so-called size effects. Therefore, more studies in the microforming process are greatly needed. In this study, micro deep drawing processes using stainless steel 304 (SS304) were studied through virtual simulations and physical experiments. Due to the constraints of the drawability of SS304 at the micro scale, it is very difficult to obtain the cup height/cup diameter ratio that is greater than one in a single draw. Therefore, a multi-stage drawing process was proposed to achieve this goal. A series of iterative simulations (using LS-Dyna) were conducted for micro die designs and virtual tryout. In addition to designs and simulations, several experiments on single draw and multi-stage draw were conducted to verify the simulation results and understand the limitations of FEA on the micro deep drawing process.

 
AdviserJenn-Terng Gau
SchoolNORTHERN ILLINOIS UNIVERSITY
SourceMAI/ 48-01, p. , Oct 2009
Source TypeThesis
SubjectsMechanical engineering; Materials Science
Publication Number1467980
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