Shaping Materials
Single Curve
Compound Curve
Strip heater
acrylic line bending
Box folder
metal bending
Vacuum Forming
Must have draft angle and round corners
Bending
Press Forming
Casting - Metals
Sand Casting
2 parts - Drag (bottom) and Cope (top)
easy / 3D shapes
can only be done one at a time
Die Casting
use of gravity
steel mould
Moulding
Extrusion
forcing a material through a hole (die)
Injection Moulding
forcing molten plastic into a mould
Blow Moulding
used for bottles
expensive to set up but unit cost very low - mass production
Lamination
2 or more layers bonded together to make a single, larger section
bag press
e.g Plywood
curved shapes
click to edit
heats a single line on acrylic - softens and bends
HIPS - thermoplastic
Dome Blowing
sprue pins
ABS / Polyprop
hollow form
- Granules heated and melted
- Extruded into a 'parison'
Parison is put into mould
- Air is blown and shape is formed
Cools and hardens - bottle!
tubes / rods etc