Chapter 1: Introduction^[1]

This chapter provides an overview of the basic principles and historic development of metal extrusion processes. It starts by illustrating the two major process categories: direct extrusion and indirect extrusion. It then briefly defines hydrostatic extrusion and the conform process. The history coverage addresses early patents for extrusion of lead at the turn of the 17th century up through the major process innovations in the 20th century.