Flashcards
Test 1 - Revison
Cards in this deck (27)
- 1RollingHot rolling - above recrystallisation temp
(Formable, fine equaixed grains, cast dendrite structure -> wrought structure)
Cold rolling - room temp
(strain hardens - dislocations entangle) - 2AnisotropyDifferent mechanical properties
in direction directions
(e.g.wood) - 3CastingComplex shapes
Internal and external
(e.g. engine block)
Limited mechanical properties
Poor accuracy and finish - 4Set up of CastingPouring basin
Sprue
Runner
Gate
Riser
Cope & Drag - 5Types of CastingSand
Investment
Die - 6SandCheap
Many shapes and sizes
Poor surface finish - 7InvestmentMold, wax, slurry, melt, metal
Complex shapes
Good surface finish (fine grains)
Wax can be re-used
Expensive
Many processes - 8DieMolten metal injected under high pressure
Cold chamber / Hot chamber - 9Squeeze castingOpen die pressed with other half
- 10Casting defectsMississippi + H
MMCCSSPP + H
Misrun, Mold Shift, Cold shut, Cold shot, Shrinkage cavity, Sand blow, Pin holes, Penetration + Hot tears
Temperature, pour speed, mold shape - 11RollingDentritic structure -> Wrought structure
Thread, Ring
Small reduction leaves the surface in compression - 12AnnealingReduces dislocation entanglements
- 13Rolling defectsWAZE
Wavy edges, Alligatoring, Zipper cracks, Edge cracks
Un-uniform temperature, high rolling pressure, roll speed - 14Temperature Profile for Extrusion
- 15HomogenisationHeated to above recrystallisation temp but below melting temp
Even out grain boundaries
Rounder grains
Reduce stress
Better extrusion - 16Extrusion Limit diagram
- 17Factoring affecting extrusionTemperature
Speed
Lubrication - 18Calculate force of extrusion
- 19DrawingDie angle
Draw Speed
Lubrication - 20Creepa
- 21Draw Rolling
- 22Bernoulli's theorem
- 23Skin of metal on a moldFine equiaxed grains
Coarse columnar grains then grow out - 24Temperature in a mold
- 25Temperature of an alloy in a mold
- 26Solidification timeC ( Volume / Surface Area) ^ n
- 27Reynolds number
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- Uni Manufacturing Technology Flashcards on Test 1 - Revison, created by Hugo James on 02/05/2016.
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- Hugo James
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