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Forming processes – extrusion
This unit addresses aspects of the following syllabus outcomes:
H1.2 differentiates between properties of materials and justifies the selection of materials, components and processing in engineering.
H2.1 determines suitable properties, uses and applications of materials in engineering
Extract from Stage 6 Engineering Studies Syllabus. © Board of Studies, NSW, 1999.
This unit covers the process of extrusion as an example of a metal forming process.
Introduction
Extrusion is used to manufacture a large variety of cross-sectional shapes in suitable materials. It is this ability that makes this a significant process in the shaping of materials and the production of parts for cars, household appliances and other consumer goods.
View the PowerPoint presentation in order to answer the following questions related to the extrusion process.
- Outline the process of extrusion.
- Describe a common process to which extrusion could be compared.
- Outline the function of the die in the extrusion process.
- Identify the types of products that are produced by the extrusion process.
- Identify and analyse an advantage of the extrusion process.
The extrusion process may be performed as either a cold or hot process as is outlined in the following web site: http://www.efunda.com/processes/metal_processing/extrusion.cfm 
- Identify the types of metals that are commonly used in the cold extrusion process.
- Outline the advantages of cold extrusion, i.e. extruding metal below its recystallisation temperature.
- Identify items that are typically produced by the hot extrusion process.
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