3.1 Casting

Question 1

What is sand casting disadvantages

Answer 1

labour intensive

not high quality surface finish

suitable for only one off production

Question 2

What are some of the uses for sand casting

Answer 2

railway carriage wheels
vices
bollards
drain covers

Question 3

What is the set up for sand casting

Answer 3

drag on bottom packed with sand and bottom half of mould

cope on top packed with sand and top hald of mould

sprue pins inserted aswell as vents created than metal poured in

Question 4

What is investment casting used for

Answer 4

wax patterns melt on contact with molten metal

intricate shapes such as jewellery, hip replacement joints

Question 5

What is gravity die casting

Answer 5

aluminium
gravity helps metal flow into mould

large batch and mass production

Question 6

What is gravity die casting used for

Answer 6

alloy wheels
engine components

Question 7

What is pressure die casting

Answer 7

similar to gravity

fast process

Question 8

What are the uses of pressure die casting

Answer 8

toy cars
collectible figures

Question 9

What is plaster of paris

Answer 9

low cost similar to sand casting

only used for non-ferrous metals and excellent surface finish

Question 10

What is resin casting

Answer 10

simple process with polymers like acrylic or epoxy

gently vibrated to remove air bubbles