Assignments - 1
Name of the Chapter : Metal Forming Processes
Short Type Questions
[2011(w)-new, 2011(w)-old, 2012, 2015]
Ans. Extrusion is a process in which a billet or slug or metal is forced by high pressure through as
orifice that is shaped to provide the desired form to the finished part.
It is just like squeezing the toothpaste tube.
What are the types of extrusion?
Ans. Extrusion is of two types
Cold extrusion : Direct extrusion, Indirect extrusion
Hot Extrusion : Direct extrusion, Indirect extrusion.
Define rolling process?
Ans. Rolling is most rapid method of forming metal into desired shapes by plastic deformation in
What is the field application of rolling process?
Ans. To make metal sheets from hot or cold billet
Bars of all shapes, rods, sheets, foils of softer metal.
What is impact extrusion?
Ans. Extrusion made by striking slugs of metal & formins them by high impact. Is known as impact
What is the difference between hot rolling and cold rolling?
Ans. - In hot rolling process metal in a hot plastic state is passed between two rolls revolving at the
same speed but in opposite direction. Sheets can be made by hot rolling. It may be finished or
- In cold rolling. Bars of all shapes, rods, sheets, foils of softer metal can be made. In this we
get bright surface, finished, improved physical properties.
Write two differences between rolling and extrusion?
Ans. - In rolling hot or cold metal may put in between two or more roller bites to from desirable
- In extrusion metal placed in a closed cavity externally heated & press with high pressure to be
out in desirable shape like squeezing of toothpaste tube.