Hi etch!
Sorry forgot to tell u that we are based in Poland.I dont think that we are in competition.We dont do any aerospace at all.We focus on large sand castings 50kg-500kg.We supply many different industries like medical,mechanical,electrical,lighting....
So nothing to hide I guess.
What do u...
Hi sbi!
The core venting is not a problem as we get problemswith nad without cores.Strontium makes a big difference.
Hi etch!
U r right about the weather and the catalyst,it makes a difference.But we had the same additions last year and didnt have such problems.We run at 80-90% reclaimed sand...
Hi etch,
we cast our test bars according to EN 1706 in sand casting,but we add some material and machine them.I had
some bars pulled at another source and get the same results.They do their on bars and are successful but they have low pressure die casting.
Do u know any source on the web where a...
Hi,
we have surface porosity problems with our aluminium castings.We use furane sand forour molds.The pores arise on heavy walls and on areas where cores are cast in.
In my opinion its a metal-sand reaction.
We found that if we modify with strontium the problem is way bigger than with sodium...
We are also having difficulties to reach high elongation in our test bars.We cast 18mm dia. test bar according to EN1706 and are reaching 3,5% elongation with AlSi7Mg T6.
I think an important issue is what kind of test bar(shape,size) and how exactly it is cast(gating,chills,...).
So,if anyone...
