tech gcse yr 11 Flashcards
3 methods of communication
-freehand sketches
-physical mock ups
-mood boards
what is a thermosetting plastic
are plastics do not soften on heating
4 thermosetting plastics
melamine
polyester resin
epoxy resin
urea formaldehyde
melamine 3 properties
-flame resistant
-food hygienic
-electrical insulator
melamine 3 applications
-kitchen worktops
-welding gloves
-ashtrays
polyester resin 3 properties
-adhesive properties
-electrical insulator
-resistance to water absorption
polyester resin 3 applications
-boats
-car bodies
-suitcases
epoxy resin 3 properties
-electrical insulator
-adhesive properties
-resistance to water absorption
epoxy resin 3 applications
-paints
-coating electrical components
-adhesives
urea formaldehyde 3 properties
-adhesive properties
-electrical insulator
-resistance to water absorption
urea formaldehyde 3 aplication
-Electrical fittings
-Door handles
-Adhesives
what is a thermoplastic
can be heated and reshaped many times
5 thermoplastics
-ABS
-PVC
-Nylon
-HIPS
-acrylic
acrylic 3 properties
-Coloured or clear
-Relatively hard and durable
-Good electrical insulator
acrylic 3 applications
-visors,
-road signs
-bathtubs
HIPS 3 properties
- durable
-Easy to cut
-Food hygienic (natural white)
HIPS 3 applications
-Disposable plates
-cups
-toys
ABS 3 properties
-durable
-Easy to cut
-chemical resistance
ABS 3 applications
-Keyboards
-air plane trays
-lego
PVC 3 properties
- durable
-electrical insulator - flame resistance
PVC 3 applications
-pipes
-credit cards
-electrical cables
nylon 3 properties
-strong
-durable
-Self lubricating
nylon 3 applications
-Gears
-airbags
-umbrellas
name 3 hardwoods
-beech
-mahogany
-oak
beech 3 properties
-Light in colour
- durable.
- easy to work
beech 3 applications
-furniture
-toys
-tool handles
mahogany 3 properties
-easy to work
-reddish brown
-expensive.
mahogany 3 applications
-indoor furniture
-shop fittings
-veneers.
oak 3 properties
-light in colour
-Hard to work
-good appearance.
oak 3 applications
- boats,
-beams
-veneers.
name 2 softwoods
-pine
-cedar
pine 3 properties
-Knot free.
-Expensive.
-Pale yellow i
pine 2 applications
-knot free furniture
-doors and staircases.
cedar 3 properties
-A pale yellow-
-fine texture.
-Light weight
cedar 3 applications
-furniture
-boats
-veneers
name 4 manufactured boards
-plywood
-chipboard
-MDF
-veneered manu boards
MDF 3 properties
-Smooth, even surface.
-Easily machined
-water and fire resistant forms.
MDF 2 applications
-Furniture
-interior panelling
Plywood 2 properties
-A very strong
-layers glued at 90 degrees to each other.
plywood 2 applications
-furniture
-boat building
chipboard 3 properties
-chips of wood glued together. –veneered
-covered in plastic laminate.
chipboard 2 applications
-furniture
-DIY work
name 3 ferrous metals
-stainless steel
-carbon steel
-mild steel
name 3 non ferrous metals
-aluminium
-brass
-copper
stainless steel 1 property
Iron, carbon, nickel and chromium
stainless steel 2 applications
-cutlery
-surgery tools
carbon steel 1 property
-made of carbon and iron
carbon steel 2 applications
-cutting tools
-drill bits
mild steel 2 properties
-made of carbon and iron
-malleable
mild steel 2 applications
-nails
-screws
why do we use alloying
to improve metals properties
what is graphene
allotrope of carbon
graphene 3 properties
-strong
-flexible
-good conductor
graphene 2 applications
-solar cells
-battries
annealing process
-metal is heated at a specific temperature
-for a set period of time
-leave to cool very slowly
normalising process
-same as annealing
-only for ferrous metals
tempering process
-heated under its critical point temperature
-then air-cooled
hardening
-heat with a torch until cherry red
-quickly cooling by quenching in cold water
what does annealing do to a metal
-softens metal
-making it more malleable
what does normalising do to a metal
-makes it tough
-making it more ductile
what does tempering do to a metal
-makes it less hard
-makes it more tough
what does hardening do to a metal
-makes it hard
-more brittle
vacuum forming process (8)
-put mould in machine
-put plastic in machine, clamped air tight
-heat plastic
-raise mould
-vacuum sucks air out
-wrapping the plastic around mould
-let it cool
-remove mould
line bending process (3)
-mark a dash line
-use a line bender or strip heater to heat area
-bend to desired angle
metal folding process
-mark a dash line
-line up the dash line with the top of vice or folding bar
-use scrap wood and a mallet to press metal to desired angle