8.3 - Forms & 8.4 - Material Suitability

Question 1

Sheet vs plate?

Answer 1

Sheet is thinner, but same shape

Question 2

What are Bars?

Answer 2

Length of material, can be cylindrical, square, etc.

Question 3

What are Wires?

Answer 3

Thin and long, eg. copper wires

Question 4

What are Sections?

Answer 4

Shaped material bars, eg. tubes, beams, channels

Question 5

What are Extrusions?

Answer 5

Fixed cross section, material pushed through a die

Question 6

What are Castings?

Answer 6

Molten iron cooled in a mould

Question 7

What are Forgings?

Answer 7

Hot metal locally compressed (hammer) to shape it

Question 8

What is Hot / cold rolling?

Answer 8

Compressing using rollers, cold is at room temp

Question 9

Application of Cast iron? Why?

Answer 9

Lathe bed
Easy to cast into complex shape
Strong and Heavy

Question 10

Application of Aluminium? Why?

Answer 10

Large aircraft body
Available in sheet form
Lightweight
Easy to cut and shape

Question 11

Application of Copper? Why?

Answer 11

Electrical cable
Ductile (drawn into wires)
Corrosion resistant
Good electrical conductor

Question 12

Application of Perspex?

Answer 12

Machine guard cover
Transparent
Lightweight
Can be bent and shaped

Question 13

Application of Glass fibre composite?

Answer 13

Speed boat hull
Can be moulded into a streamline shape
Lightweight
Corrosion resistant