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ENGINEERING, PPT 2024 HSC 27b

A towbar hitch and shear pin is shown.
 

Explain why hot forging would be used to manufacture the shear pin.   (3 marks)

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  • Hot forging creates components that exhibit superior strength compared to casting or machining methods.
  • This process enables the production of more intricate geometries while achieving an ideal combination of mechanical properties.
  • These properties include maximum yield strength, increased ductility, and reduced hardness.

Show Worked Solution

  • Hot forging creates components that exhibit superior strength compared to casting or machining methods.
  • This process enables the production of more intricate geometries while achieving an ideal combination of mechanical properties.
  • These properties include maximum yield strength, increased ductility, and reduced hardness.
♦ Mean mark 49%.

ENGINEERING, PPT 2016 HSC 24b

Give reasons for selecting an aluminium alloy for the side panel of the truck.   (2 marks)

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Reasons for using aluminium alloy:

  • Easily shaped, fabricated and installed.
  • Good strength to weight ratio.
  • Waterproof and resistant to corrosion.
Show Worked Solution

Reasons for using aluminium alloy:

  • Easily shaped, fabricated and installed.
  • Good strength to weight ratio.
  • Waterproof and resistant to corrosion.

♦ Mean mark 49%.

ENGINEERING, PPT 2018 HSC 24b

The cross-section of an extruded aluminium alloy plank is shown.
 

Outline the steps of the extrusion process.   (2 marks)

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The extruded aluminium plank is made by:

  • Heating an aluminium billet (heat > recrystallisation temperature).
  • Forcing the billet through a heated die to make the necessary cross-section.
Show Worked Solution

The extruded aluminium plank is made by:

  • Heating an aluminium billet (heat > recrystallisation temperature).
  • Forcing the billet through a heated die to make the necessary cross-section.
Mean mark 56%.