processo lost foam

[o'rey92]

Bye to all,
I am studying the process lost foam with polystyrene model and I wanted to know that tolerances and roughness are obtained through this process, since on my book it is not well specified.
Thank you all. Good day

 

[radio]

hi o'rey92, I remind you that for the "new" is highly recommended presentation.
You can do it. qui.

 

[SHIREN]

Bye to all,
I am studying the process lost foam with polystyrene model and I wanted to know that tolerances and roughness are obtained through this process, since on my book it is not well specified.
Thank you all. Good day

hi do not exist specific on tolerances and roughness for a casting obtained from a polystyrene model
depends on a multitude of factors
model size
if there are internal cavities
if you stay the polystyrene in the bracket
or extract "breaking" polystyrene
in the first case gases are released that must be collected or stored and create spongy surfaces
in the second case depends on the operator manual
from the density of polystyrene used
on processed surfaces minimum +10mm growing with growing model size
depends on construction technology with cad-cam
or operator-banco-hand
But there's a big difference in the cost of the big model 1/10
If you stick some jpeg I'd be more precise
Thank you very much