Please enable JavaScript.
Coggle requires JavaScript to display documents.
Metal Casting Processes (Sand (Types (Cold Box sand mixed with inorganic…
Metal Casting Processes
Sand
ADV: basically any metal or shape since you can have cores, weight isnt an issue and its p cheap as far as these processes go
LIMITS: Requires post processing (finishing), wide tolerances, cant make thin shapes
-
-
honestly, making patterns and moulds are a whole big thing by itself!!
Shell Mould
ADV: dimensional accuracy, nice surfaces, good for mass production
LIMITS: smol parts onli, large fixed cost bc the patterns and equipment are $$
pattern is made of a metal, and the pattern is coated in sand or silicone so that the casting metal doesnt stick to the pattern. the sand is resined and hardens and BOOM u got dat shell happnin'
shell is thin like 5-10mm, smol grains must so its mad permeable and wow that gas, so much more gas than a thiqq mould situation. good ventilation is a must.
since its still like sand and stuff, you can make small complicated shapes like gear housings, connecting rods.
Evaporative Pattern
-
ADV: most metals can be cast, complexity of parts, no size limit! LIMITS: low strength of mould, not good for low volume production (bc of the die)
no parting lines, cores, risers required to get a complicated shape
Plaster Mould
low porosity!! great for accuracy,
aka PRECISION CASTING so you know it has nice surface finish. detail, dimensions.
made with like plaster of paris, gypsum, talc/silica and water. the slurry is poured over a pattern. forms halves
non ferrous metals only. not great for mass produced parts, fiddly i guess. takes ages to make a mould.
-
Investment
wax pattern coated in ceramic slurry to make the mould, wax melted out, metal poured in. ceramic smashed. normally you connect heaps of patterns together on a tree
-
-
-
-
Expendable Mould, Permanent Pattern
Expendable Mould, Expendable Pattern