Extrusion

Abstract

In view of its practical importance, the process of extrusion of metal components has received very wide attention, and much has been written about it. For the purpose of this book, we shall consider a very limited selection of more recent contributions, since these will be sufficient to indicate the range of the available experimental and theoretical methods and techniques, the attendant practical and analytical problems and the final conclusions. Our consideration of the analytical methods of treatment will not contain any detailed derivations but will be again limited to the indication of the basic principles and concepts on which they are based. Although, of course, a variety of shapes are obtained by extrusion, the processes of rod and tube extrusion are of particular interest since they form in effect the basis for considering the forming of other components. Of the two, rod extrusion is both more complicated and much better documented. In many instances the expressions derived, for this case, require only small modifications before they can be applied to thin-walled tubes, and consequently we shall concentrate on the analyses of rod extrusion.