میتونید اینارو برام پیدا کنید؟
http://books.google.com/books?id=gPQ1AQAAIAAJ&q=mandrel#search_anchor
http://books.google.com/books/about/Flow_forming_process_optimization_of_SAE.html?id=PXf2GwAACAAJ
http://books.google.com/books?id=wUuDAAAAMAAJ&q=mandrel#search_anchor...