@article { author = {}, title = {OPTIMIZATION OF SPECIFIC DIE PROFILES IN THIN WALLED TUBE EXTRUSION}, journal = {Iranian Journal of Science and Technology Transactions of Mechanical Engineering}, volume = {37}, number = {2}, pages = {203-215}, year = {2013}, publisher = {Shiraz University}, issn = {2228-6187}, eissn = {}, doi = {10.22099/ijstm.2013.1748}, abstract = {In the present work, three extrusion profiles have been investigated objectively, theseare a conical, a cosine which is proposed in this study and a profile designed to impose equal strainincrements over the equi-spaced sections. Each of them reduces a portion of the required power forextrusion. Conical profile provides the least frictional surface, cosine profile omits the surfaces ofvelocity discontinuity and the other profile reduces the power attributed to redundancy duringdeformation. However, the capability of these profiles in reducing the total power of the process isvery different. Results suggest that cosine profile is the best energy-wise, whereas the profilewhich imposes equal strain increments over the equi-spaced sections provides the best distributionof strain in the product. In addition, a simple exponential equation as a function of die geometry ispresented for the case of the profile which imposes equal strain increments over the equi-spacedsections.}, keywords = {Tube extrusion,upper-bound method,Finite element method,power optimization,die profile}, url = {https://ijstm.shirazu.ac.ir/article_1748.html}, eprint = {https://ijstm.shirazu.ac.ir/article_1748_43b11dbad8c9226f3a9823c133566c92.pdf} }