Lec 5Me

Metal Forming

process of obtaining the req. shape and size on the metal by subjecting it to plastic deformation

Hot Working Processes

metals are formed above crystallization temp; remain decutile and soft; not good surface finish

Cold Working Processes

metals are formed below crystallization temp; increases strength lbut decrease ductility; better surface qual;

FREDP

Types of cold working proceses

Bulk Metal forming

refers to the process used when the metal has low SA to V ratioand is shaped by applying significant force, resulting in large deformations. This includes techniques such as forging, rolling, and extrusion.

Forging

uses punch and die, widely used, compressive and tensile

Open Die Forging and Closed Die Forging

2 types of forgingthat differ in tooling and process. Open die forging uses flat or simple dies while closed die forging involves complex shapes made by enclosed dies.

Extrusion

metal being force into a die to produce rods and tubes

Forward Extrusion

extrusion where the punch and the workpiece move along the same directionB

Backward Extrusion

extrusion where workpiece and punch move at opp. direction

Drawing

uses tensile force; ung metal ung hinihilato reduce its cross-section and length, resulting in wire or rod shapes.

Sheet Metal forming

uses force to modify geometry rather than remove any materialDee

Deep Drawing

sheet metal is forced into a cup hollow shape without changin thickness through the application of tensile and compressive forces.

Metal Stamping

punching;blanking;embossing;bending etc<

Metal Blanking

metal workpiece is removed from primary metal strip when punched; the material removed is the new workpiece

Punching

metal workpiece is removed from primary metal strip when punched; the material removed is the scrap

Metal Rolling

compressive deformation; can be hot/cold; bars,sheets,plates

Metal Spinning

transforms sheet metal into a hollow shape using tens. and comp.

Metal bending

includes rotary bending, swivel bending, roll bending using rotary die

Powder Metal Forming

process performed by heating compacted metal powders just below their melting point