MANUFACTURING PROCESSES FIT（生产过程符合）.pdfVIP

MANUFACTURING MANUFACTURING PROCESSES PROCESSES - AMEM 201 – - AMEM 201 – Lecture 4: Forming Processes Lecture 4: Forming Processes (Rolling, Extrusion, Forging, Drawing) (Rolling, Extrusion, Forging, Drawing) DR. SOTIRIS L. OMIROU Forming Processes - Definition Types - Forming Processes - Definition Types - Forming processes are those in which the shape of a metal piece is changed by plastic deformation Forming processes are commonly classified into hot-working and cold-working operations. Typical forming processes are: Rolling Extrusion Forging Drawing 2 2 1 Forming Processes - Rolling - Forming Processes - Rolling - Rolling is a process of reduction of the cross-sectional area or shaping a metal piece through the deformation caused by a pair of rotating in opposite directions metal rolls. 3 3 Forming Processes - Rolling - Forming Processes - Rolling - The gap between the rotating rolls is less than the thickness of the entering bar therefore a friction force is necessary in order to bite the bar and to pull it through the rolls. A metal bar passing through the rotating rolls is squeezed, and it elongates while its cross section area decreases.