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processes Flashcards

1
Q

lamination (clamp)

A

bonding materials together which are typically wood veneers like 3mm plywood
glued together and bent over a former
held in place while drying

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2
Q

lamination (vacuum bagging)

A

vacuum bagging the former and veneers are placed under a polythene sheet
the edges of the sheet are taped down to the table a valve is fitted to the polymer and a vacuum pump sucks out the air = pressure

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3
Q

steam bending

A

combined heat and steam enables strips of timber to be made pliable so they can be shaped over a former held in
putting timber into a steam box where the timber will absorb the steam then bent over.
quicker

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4
Q

sandcasting

A

form high melting point metals into components and products
normally carried out in foundries
one off or batch production
not a high quality finish

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5
Q

sandcasting process

A
  1. pattern is made from wood
  2. drag is turned over and a second box called the cops is clamped into position over the top of the drag sprue and runner is added
  3. sand is packed into the cops around the runner riser and pattern a small depression is made on the surface around the sprue to make a pouring basin
  4. cope and drag are separated, stakes and patterns are carefully removed, connecting channels are cut to join
    cope and drag reassembled
    5 vent holes
    6 metal poured into pouring basin down the runner
    once cooled removed
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6
Q

die casting

A

lower melting point metals like aluminium uses tool steel moulds which are reusable only used in large and mass production
high quality surface finish

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7
Q

gravity die casting

A

melting the metal and then pouring into the mould which relies of gravity with a runner and a riser
thicker or heavier sections

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8
Q

pressure die casting

A

produce cast items quickly and in high volumes

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9
Q

hot chamber pressure die casting

A

morels metal is stored in a chamber which is part of the machine a pneumatic and hydraulic pinger forces a shot of molten metal through the neck into the die all filled allowing fine detail
aluminium not used

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10
Q

cold chamber pressure die casting

A

molten metal is kept separetly in a melting crucible and then ladled into the shot chamber a ram forces the metal into the mould

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11
Q

investment casting
lost wax casting

A

cast items that are intricate or awkward shapes
difficult to mould in other places
cast jewellery
stainless steel brass aluminium

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12
Q

investement casting process

A

1 excellent replica of cast is made in wax
2 wax pattern is dip coated with a refractory clay then fired in a kiln to bake the clay wax is burned leaving hollow
3 molten is poured in
4 cooled and broken away

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13
Q

pewter casting process

A

1 mould is made from mdfwith the laser cutter with sprue and runner
2 mould is sandwiched and clamped
3 pewter is ladled in
4 removed
5 hacksaw off runner and riser
6 casting filed
7 polished

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14
Q

vacuum forming

A

1 mould is placed on the bed of the machine (platen)
2 polymer sheet is clamped and heater is pulled over
3 when polymer sheet is soft platen rises and heater is removed
4 pump switches on and sucks polymer to mould
5 removed and cut

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15
Q

thermoforming

A

industrial
baths
extra detail
slow - detailed and embossed
same as vacuum just additional mould presented into the surface
traps the polymer

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16
Q

calendering

A

smoothing and rolling process
thin polymer sheets
heating pellets of thermoplastics so that it melts and then extruded through heated rollers
industrial
continuous

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17
Q

line bending

A

produce bends in sheet thermoplastic like acrylic
one off of limited
slow and labour intensive
melted and bent

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18
Q

lamination

A

3d products from fibre based composites like GRP
boats yachts kayaks

1 mould or former in shape
2 coated with release agent like wax
3 top layer of gel coat is applied - polyester resin
4 fibreglass is laid over resin is rolled over (stippling)
5 repeated until desired thickness
6 sets

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19
Q

injection moulding

A

1 thermoplastics granules poured into hopper
2 screw thread is rotated by a motor
3 heaters melt
4 hydraulic ram forces screw thread forward
5 mould is water cooled
6 removed
7 trimmed

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20
Q

blowmoulding

A

1 polymer fed into hopper
2 archimedean screw pulls the polymer through the heated section
3 melted polymer extruded as a tube
4 air is injected forming to sides
5 ejected

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21
Q

rotational moulding

A

heavy duty seamless hollow objects that need a large wall thickness like traffic cones
1 granules into mould
2 transferred to oven at about 270degrees
3 rotated slowly less than 20 times per min
4 when at thickness it’s cooled
5 removed

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22
Q

extrusion

A

solid rod or hollow tube or I and T sections
1 granules in hopper
2 moved the polymer granules past the heaters
3 heaters soften polymer
4 ram pushes the screw through the steel die making shape
5 may be supported by rollers
6 cooled and cut

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23
Q

compression moulding

A

urea or melamine formaldehyde
electrical light fittings

1 slug of thermoset is inserted into moulds
2 closed with hydraulic pressure making it take shape of mould
3 cross linking to allow it to cure
4 opens and removed
5 flash removed

24
Q

mig welding

A

weld thin gauge metal or aluminium
heat generated is localised will not burn or distort
joining tubular steel in products like climbing frames
one off fabrication
electric arc to produce heat melting the joint area
uses inert gas likr co2 to form flux shield
helps prevent oxidisation

25
tig welding
used to weld metals like stainless steel aswell as aluminium and copper electric arc welding process electrode doesn’t melt in the process separate filled rod used gas shield of argon to protect from oxidisation allows for greater control by the operator so high levels of skill needed and slow swimming pool ladders
26
oxyacetylene welding
low carbon steel sheet, tube or plate where arc welding processes aren’t available useful for quick repair jobs mixture of oxygen and acytylene to form an intense flame that can burn at temps of 3500 degrees stored in separate bottles and moxed in a blow torch 1 metal prepared by grinding an angle on the edges of the two edges forming a V shape 2 joint area heating to form a melt pool steel filler rod is introduced form a continuous bead along joint
27
riveting
join sheet metal or plate head at one end and shaft at other overlapped and drilled rivet shaft is inserted into hole the end is hammered in squeezing the two pieces together
28
pop riveting
thin sheet of metal rivet and pin rivet head pushed through hole drilled through the two pieces of metal being joined head squashes pulling together when underside of joint is inaccessible
29
self tapping screws
joining thin sheet metal pilot hole is drilled through the metal parts to be joined has a course thread when screwed in cuts it’s own hole when panels needs to be removed for maintenance children’s toys
30
machine screws
thicker pieces of metal together inspection covers on motor or gear housings or parts that need to be removed for maintenance they have a thread the entire length of the shaft
31
nut and bolt
put all the way through both pieces of metal and then a nut is tightened on to the end of the bolt to keep pieces together nyloc nuts= nylon to deform to the bolts shape
32
press forming
sheet metal into 3D medium carbon steel aluminium mass production dies are made from hardened steel
33
spinning
body of stainless steel kettles radial symmetry spinning sheet metal at high speed mass production set up by computer controlled machines 1. mandrel put under chuck sheet metal held in place 2. roller tool is moved into the blank and is rotated with the mandrel stretching 3. roller tool is moved along mandrel as pressure is maintained against the rotating blank 4. roller tool is moved to end while still in contact with blank 5. removed and trimmed
34
cupping and deep drawing
tube like shapes depth of pressing exceeds the diameter multi operation process mass continuous production 1. pressing blank is clamped over a deep drawing die using a retainer 2. hydraulic press moved the deep drawing punch to be in contact with the blank, makes cup shape 3. pressed further down
35
drop forging
hot metal into finished products needs to be tough and hard spanner’s pliers 1. cast tool steel die, secured to top of anvil 2. ram equipped 3. billet to be forged is heated to above recrystallisation temp 4. heated billet placed by an operator into the anvil die hydraulic ram brought down with force 5. lifted and cooled
36
wrought iron forging
wrought iron is a form of iron that is suitable for forging rolling and bending rather than casting very low carbon content shaped using hand tools
37
milling
machine that looks like a drill clamped can run in X and Y and Z cut slots shape the the edge manually or computer controlled
38
turning
centre lathe bar can be held in rotating chuck and machined to reduce the diameter and to square or face off the end thread and drill manual or CNC cutting tools in tool post
39
plasma cutting
super heated ionised gas electrically conductive plasma cutter uses conductive gas to transfer energy from the power supply to the conductive material cut is faster and cleaner directed out of torch gas forced through nozzle one off production
40
punching/stamping
wastage process computer controlled machines stamp out sections of sheet metal X and Y graphic user interface specialist programming not needed punch pushes through sheet
41
butt joint
adhesive such as PVA light weight applications clamp until dry
42
mitre joint
simple gluing at a 90 degree corner using 45 degree ends
43
comb joint
make boxes two pieces being interlocked increased glue surface area
44
dovetail joint
drawers directional strength once glued impossible to pull apart router and jig or dovetail saw
45
housing joint
framework construction cabinets shelving groove in one piece second piece inserted
46
half lap joint
simple frames or boxes step in end of each piece large gluing surface easy to mark out
47
knock down fittings
flat pack furniture supply products that are not assembled reducing costs
48
modesty blocks
polymer cloak that have moulded holes to take screws block to panel cupboards of storage units
49
barrel nut and bolt
cross dowel bolt is inserted through the other piece of timber and tightened into the cross dowel flat pack furniture
50
cam lock connector
metal dowel that is scrweed into one of the pieces by inserting a screwdriver into the slot on the side that cam is a disk that fit into a pre drilled hole locks into cam
51
wood screws
coarser pitch thread conical head to flush slot head - slot head screw driver wall products phillips contact with screw driver 57 degree angle pozidriv allow greater torque power screwdrivers
52
bolts
join wood pieces coach bolts thread runs 2 thirds square piece that digs into wood when tightened can’t be undone
53
turning
machining wood on a wood lathe turning between centres- machine a spindle such as chair legs and table legs turning between centres enables the spindle to be machined to a reduced diameter turning on a faceplate- domes or bowls turning on a lathe
54
routing timber
slots and holes decorative mouldings table top electric plunge router CNC routers for natural timbers manufactured boards CAD drawings downloaded
55
milling timber
timbers can be machined small sized basic jobs rough prototypes

product design (31 decks)

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