4.4 shaping

Question 1

shaping techniques

Answer 1

manufacturing methods for modifying shape of material

Question 2

moulding types

Answer 2

injection
blow
compression
rotational
extrusion

Question 3

everything abt injection moulding

Answer 3

material heated, pushed into mould and allowed to cool taking the necessary shape

adv:
high precision
low cost per part
little to no waste
fast production time

disadv:
high set up cost
limitation on size of parts
maintenance cost

Question 4

everything abt blow moulding

Answer 4

inflating hot plastic into mould (for hollow forms)

adv:
once set up, rapid method

disadv:
limited to hollow parts
certain shapes cant be produced

Question 5

everything abt compression moulding

Answer 5

heated material is placed into a heated mould cavity, the mould then applies pressure to shape the material

adv:
lower production costs compared to others
good for high production runs

disadv:
limited to relatively simple forms

Question 6

everything abt rotational moulding

Answer 6

heated hollow mould is rotated as thermoplastic is poured in, liquid takes for of the mould as it moves around

adv:
moulds are lower cost to produce
ideal for large forms (in comparison)
low waste

disadv:
material costs can be higher (in comparison)

Question 7

everything abt extrusion moulding

Answer 7

material is heated and forced through a die, shaping material as it cools and hardens

adv:
fast production
low wastage
best for long products

disadv:
high initial cost
part size restriction

Question 8

thermoforming

Answer 8

heating a sheet of thermoplastic to the point that it becomes soft, and placing it into a mould

Question 9

laminating

Answer 9

laying down thin layers of material joined with adhesive

Question 10

casting is…?
casting types

Answer 10

pouring molten metal into a mould
sand casting and high pressure die casting

Question 11

everything about sand casting

Answer 11

sand is the mould material

adv:
low cost
easy to operate
complex shapes can be made

disadv:
labour intensive
unit cost can be high for one off
parts may require a lot of finishing

Question 12

everything about high pressure die casting

Answer 12

molten metal forced under pressure into locked metal die cavity, where its held by a press until metal solidifies

adv:
ideal for complex shapes
high level of detail
great surface finish
can produce thin small parts

disadv:
expensive set up
only suitable for high production levels

Question 13

weaving

Answer 13

forming sheet like material by interlacing long threads

Question 14

knitting

Answer 14

interlocking loops of yarn and converting it into fabric