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design technology > metal processes > Flashcards

metal processes Flashcards

1
Q

what type of process is press forming

A

forming

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2
Q

what is a die

A

used to force a shape onto hard substances

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3
Q

what is a press blank

A

sheet of metal that is ready to be drawn, pressed, machined into a finished product

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4
Q

press forming process

A
  1. press blank placed between the female and male die
  2. hydraulic press punches the male die to the press blank
  3. formed press blank removed
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5
Q

press forming stock form

A

sheet

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6
Q

press forming products

A

car body parts
containers and boxes
metal seats

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7
Q

press forming key features

A

suitable for mass/large scale batch production

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8
Q

spinning process

A
  1. mandrel (former) is put onto the headstock
  2. press blank is placed between headstock and tailstock
  3. spindle is rotated
  4. press blank is pushed onto mandrel using roller tool to apply even pressure
  5. press blank forms over mandrel then when done is removed and trimmed
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9
Q

spinning stock form

A

sheet

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10
Q

spinning products

A

stainless steel kettles
light shades
saucepans

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11
Q

spinning key features

A

may show lines where sheet has been forced onto the mandrel
suitable for batch production, labour intensive

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12
Q

what type of process is spinning

A

forming

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13
Q

difference between deep drawing and cupping

A

deep drawing= depth exceeds the diameter

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14
Q

deep drawing and cupping process

A
  1. press blank placed between female and male die
  2. drawing punch pushes the press blank down into the female die to crate a basic cup shape
  3. cup is then pressed down further to create a tube shape
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15
Q

deep drawing and cupping stock form

A

sheet (round)

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16
Q

deep drawing and cupping products

A

fire extinguishers
aerosol cans
drinks cans

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17
Q

deep drawing and cupping key features

A

mass/ batch production

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18
Q

what type of process is deep drawing and cupping

A

forming

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19
Q

drop forging process

A
  1. upper die secured to ram, lower die secured to anvil
  2. metal is heated and placed onto lower die
  3. ram is bough down onto metal then ram is lifted
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20
Q

drop forging stock form

A

billet (metal bar)

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21
Q

drop forging products

A

spanners,
screwdriver shafts
pliers

products that need to be tough and hard as it maintains the internal grain structure retaining the strength

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22
Q

drop forging key features

A

mass production

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23
Q

wrought iron process

A

made by hand OR similar to drop forging (metal is HOT)

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24
Q

wrought iron stock form

A

bar

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25
Q

wrought iron products

A

decorative fencing
gate scrolls

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26
Q

wrought iron key features

A

one off / small scale batch production

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27
Q

what type of process is drop forging

A

forming

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28
Q

what type of process is wrought iron forging

A

forming

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29
Q

bending process

A
  1. press blank clamped between the punch and the die
  2. pressure applied to punch, punch lowered down and metal is bent
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30
Q

bending stock form

A

sheet
plate

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31
Q

bending products

A

seams on metal edges
product casings or housings

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32
Q

bending key features

A

cheap to set up
used in all scales of production

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33
Q

what type of process is bending

A

forming

34
Q

hot/cold rolling process

A
  1. heated/cold metal passed through a series of rollers reducing the thickness of the material
35
Q

hot vs cold rolling differences

A

cold rolling usually produces thinner products, better surface finish
hot rolling = uniform, mechanical properties, no deformation or stresses

36
Q

hot rolling products

A

railway tracks
I Beams, angle, bar, plate

37
Q

cold rolling products

A

filing cabinets, chairs, steel drums

38
Q

rolling stock form

A

billet (bar like shape)

39
Q

what type of process is rolling

A

forming

40
Q

what type of process is sand casting

A

redistribution

41
Q

sand casting process

A
  1. mould placed in bottom of box called a drag. Sand is packed into drag to cover mould.​
  2. drag is turned over and a 2nd box (cope) is clamped on top. sprue pins added which will work as runners for molten metal
  3. sand is packed down onto other side of mould
    mould and sprue pins are carefully removed from drag and cope leaving shape of mould in sand and sprue holes​
  4. small spikes are poked into sand to make vents.​
  5. molten metal is tipped into sprue holes which flows into runner then into the cavity before finally flowing up through the riser
42
Q

what is a sprue

A

Channel through which metal or plastic is poured into a mould

43
Q

what is a riser

A

A riser, also known as a feeder, is a reservoir built into a metal casting mould to allow molten metal to flow out of mould.​
​

44
Q

sand casting stock form

A

molten metal from billet

45
Q

sand casting products

A

railway carriage wheels
vices
bollards
post boxes
drain covers

46
Q

sand casting key features

A

not a high quality surface finish
suitable for one off/ small batch production

47
Q

what process is gravity die casting

A

redistribution

48
Q

gravity die casting process

A
  1. molten metal is poured down a sprue hole into a chamber and is run out of a riser
  2. once metal is cooled the product is removed
49
Q

gravity die casting stock form

A

molten metal from a billet

50
Q

gravity die casting products

A

engine components
door knobs and handles
alloy wheels

51
Q

gravity die casting key features

A

mass/ large scale batch prod
uses low melting point metals ie aluminium and aluminium based alloys, zinc based alloys

52
Q

what type of process is hot chamber and cold chamber pressure die casting

A

redistribution

53
Q

hot chamber pressure die casting process

A
  1. molten metal placed in chamber
  2. hydraulic plunger forces the molten metal into the cavity within the die
  3. ejector pins are removed, cooled product is removed
54
Q

cold chamber pressure die casting process

A
  1. molten metal poured into shot chamber
  2. ram forces the molten metal through the shot chamber into the cavity in the die
  3. ejector pins are removed, cooled product is removed
55
Q

cold/hot chamber pressure die casting stock form

A

molten metal from a billet

56
Q

cold/hot chamber pressure die casting products

A

toy cars
collectable figures
door knobs and handles

57
Q

cold/hot chamber pressure die casting key features

A

mass/ large scale batch prod
uses low melting point metals ie aluminium and aluminium based alloys, zinc based alloys

58
Q

investment casting process
(lost wax casting)

A
  1. Replica is made from wax.​
  2. Wax replica is dipped into clay before being fired in a kiln which removes the wax. ​
  3. Molten metal is poured into hot clay mould.​
  4. Metal is allowed to cool.​
  5. clay mould is broken.​
  6. Runners and vents are machined off.​
59
Q

investment casting stock form

A

molten metal from a billet

60
Q

investment casting products

A

hip replacement joints
jewellery
collectable figures

61
Q

investment casting key features

A

intricate/ awkward shapes that are otherwise difficult to mould
high quality and excellent finish
repeatable process

62
Q

low temp pewter casting process

A
  1. Mould is made out of simple materials such as MDF or Plywood using laser cutter. Mould will include sprue or runner.​
  2. Mould is sandwiched between 2 pieces of MDF.​
  3. Pewter is melted in ladle and poured into sprue.​
  4. Once pewter has cooled mould is removed.​
63
Q

low temp pewter casting stock form

A

molten metal from billet

64
Q

low temp pewter casting products

A

jewellery
key fobs

65
Q

low temp pewter casting key features

A

suitable for one off production/ small batch prod

66
Q

MIG welding process

A
  1. consumable electrode wire is fed through the welding gun at a continuous rate
  2. the electrode produces an arc at the metal work piece
  3. the arc melts the base metals allowing them to join together with the consumable electrode also being melted and added to the arc as well reinforcing the arc.
67
Q

MIG welding products

A

tubular products like
climbing frames
bike frames
vehicle exhaust

68
Q

MIG welding key features

A

used with metals like mild steel, aluminium, copper
suitable for one off or on an assembly line
faster than TIG

69
Q

brazing process

A
  1. gas or oxygen acetylene turned on, then put into flame
  2. compressed air turned on to turn flame blue
  3. pieces to be worked heated up until they are same temperature below 1000 degrees
  4. powder flux added to filler rod
  5. brass filler rod is placed onto work piece and powder flux melts and act as glue
  6. flame is removed yippee!!!!!
70
Q

brazing products

A

joining thinner gauge mild steel tube or bar
radiators

71
Q

brazing key features

A
  • one off small batch production
  • used to join dissimilar metals like mild steel to aluminium, copper and nickel
72
Q

solder process

A
  1. solder iron is cleaned using a solder sponge
  2. solder iron is placed on the work piece to heat it up a bit
  3. solder (filler rod) is added to where the solder iron is to join the two metals
73
Q

solder products

A

electrical circuit boards
joining precious metals like gold, silver
joining copper in pipework

74
Q

solder key features

A

solders tend to be copper or tin
solder is at a lower melting point than metal being joined

75
Q

spot welding process

A
  1. transformer transfers electricity into high current, low voltage into upper electrode
  2. work piece placed between the upper and bottom electrode
  3. arm adjustment pulled and the electrodes meet at the work pieces to be joined
76
Q

spot welding products

A

mild steel sheets that need to be welded at length

77
Q

spot welding key features

A

can be mass, batch or one off

78
Q

oxy acetylene process

A
  1. oxygen is switched and flame is put on
  2. acetylene put on accordingly deepening on metal thickness
  3. work piece metal is heated, steel filler rod then melts in between two metals and acts as a joiner.
  4. ya
79
Q

tungsten inert gas process

A
  1. non consumable tungesten electrode fed through the nozzle
  2. flame creates arc where consumable filler rod is melted into
  3. ya
80
Q

TIG welding products

A

stainless steel ladders for swimming pools/boats
car exhausts

81
Q

MIG vs Tig

A

MIG
faster
thicker metals
not nice finish
automatically fed though welder so easier to control

TIG
better finish

82
Q

pop riveting process

A
  1. The two pieces of metal are drilled to a size slightly larger than the rivet
  2. The pop rivet is passed
    through both holes in the metal.
  3. The rivet pliers are pushed on to the pin of the rivet and the handles are pulled together.
    As this happens the pin head is pulled into the rivet and the end of the rivet is expanded.
  4. the pin will break off leaving the rivet permanently fixed in position holding the two pieces metal together.

design technology (15 decks)

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