Abstract
A numerical model was established to investigate the micro hydro-mechanical deep drawing process of austenitic stainless steel 304 foil (0.05 mm thickness). Due to the miniaturisation of the specimen size, the effect of grain size, gap distance and radial pressure during drawing process could be prominent. The results indicate that the appropriate radial pressure and gap distance could improve the limit drawing ratio (LDR) of manufactured cylindrical cups by reducing the friction resistance. The maximum LDR obtained in the present work reaches 3.2, which is much higher than that obtained by conventional deep drawing process.
Highlights
In recent decade, micro forming has been an attractive research topic due to its wide applications in fabricating micro parts for micro electro mechanical system, microelectronic technology and precision machinery [1] With high productivity, high utilisation of raw material and good mechanical properties, micro forming process is considered to be significant for development of manufacturing engineering
Compared to conventional deep drawing, a Corresponding author: jiang@uow.edu.au the new method could significantly increase the value of material flow, decrease the tensile stress and thickness reduction at flange area, thereby improving limit drawing ratio (LDR)
Significant work has been done by researchers on deep drawing process to obtain high LDR, which is defined to be the ratio of the maximum blank diameter that can be safely drawn into a cup without flange to the punch diameter
Summary
Micro forming has been an attractive research topic due to its wide applications in fabricating micro parts for micro electro mechanical system, microelectronic technology and precision machinery [1] With high productivity, high utilisation of raw material and good mechanical properties, micro forming process is considered to be significant for development of manufacturing engineering. Significant work has been done by researchers on deep drawing process to obtain high LDR, which is defined to be the ratio of the maximum blank diameter that can be safely drawn into a cup without flange to the punch diameter. The average friction coefficient of 0.169 was reached during micro deep drawing process and the cups were well formed with LDR of 2.1. Mostafapur et al [10] investigated the pulsating blank holder effect on drawing to improve the formability of aluminum 1050 alloy by means of numerical and experimental methods, and found that the pulsating blank holder increased the depth of cylindrical parts without partial thinning and tearing compared with the static blank holder. Vollertsen and Hu [15] studied the effect of punch velocity on friction coefficient and they investigated the LDR with different friction conditions. The influence of die/blank holder and punch radius on LDR was studied by Ozek and Bal [16], and it was found that the LDR could be effectively improved by increasing the die/blank holder angle
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
