Extrusion Process | Best report
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Transcript of Extrusion Process | Best report
EXTRUSION PRESENTED BY:
MOHANADFAEK NOORI
EXTRUSION
Introduction
Extrusion is a bulk forming process in which the material is made to flow using high pressure. The deformation takes places mainly at room temperature -cold extrusion - as by this means plate-finished workpieces with close dimensional accuracy are obtained. The billets are only heated to forging temperature - hot extrusion .
Fig. (1_a) Extrusion process
CLASSIFICATION OF EXTRUSION PROCESSES
ExtrusionExtrusion
By By DirectionDirection
By By EquipmentEquipment
By Operating By Operating TemperatureTemperature
Indirect / Indirect / BackwardBackward
Direct / Direct / ForwarForwar
ddHotHot ColdCold HorizontalHorizontal VerticalVertical
Advantages
• Low Tooling Costs• Design and Change Flexibility• Good Quality• Minimal wasted material
Disadvantages
• Limited complexity of parts• Uniform cross-sectional shape only
Fig. (1_b) Extrusion process
Fig. (3) indirect Extrusion
Indirect Extrusion
he hollow ram containing the die is kept stationary and the container with the billet is caused to move. Friction at the die only (no relative movement at the container wall) requires roughly constant pressure.
Direct Extrusion
The metal billet is placed in a container and driven through the die by the ram. Friction is at the die and container wall requires higher pressure than indirect extrusion.
Fig. (3) direct Extrusion
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IMPACT EXTRUSION
• A manufacturing process in which a small shot of solid material is placed in the die and is impacted by a ram, which causes cold flow in the material.
• It may be either direct or indirect extrusion and it is usually performed on a high- speed mechanical press.
Fig. (4) Impact Extrusion
HYDROSTATIC EXTRUSION
Hydrostatic extrusion is actually a form of direct extrusion. The liquid applies pressure to all surfaces of the work billet. When the ram moves forward, it is the force from the incompressible fluid that pushes the work through the die, extruding the metal part.
Fig. (5) Hydrostatic Extrusion
what is the type of the extrusion process?
what is the type of the extrusion process?
what is the type of the extrusion process?
References:
1. 1." Fundamental principles" W. Dahl, R. Kopp, O. Pawelski, Umformtechnik, Plastomechanik und Werkstoffkunde, Verlag Stahleisen GmbH, Düsseldorf (1993)
2. A.F. Castle, Temperature Control in Aluminum Extrusion, Proc.Fifth International Aluminum Extrusion Technology Seminar, Aluminum Extruders Council and the Aluminum Associations,Inc.,1992
3. K. Lange, Ed., Fundamentals of Extrusion and Drawing and Cold and Warm Extrusion, in Handbook of Metal Forming, McGraw-Hill, 1985
4. "forging and forming",Handbook volume 1
5. " Fundamentals of Extrusion“
6. W. Johnson , ‘’ engineering plasticity’’ , book ,1980.
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