What is a green sand foundary? 2

[oranjeep]

You don't know me, but since you are into this green sand thing, I thought I woild ask you.
I am going for a job inerview in Columbia, PA on Thursday, and I have been doign som research in order to prep myself for the interview.
I was searching the internet, and found this statement.
"Our facilities include a 660,000 square foot green sand foundry, ..."
Having never been in the iron industry at all, i am not sure what this means. How significant is this? What will I expect to see when I get there?
I know what a foundary is, but what is a green sand foundary?

 

[AlanD]

I'd assume that it a foundry that uses almost exclusively green sand to make the molds.

 

[murasl]

Greensand moulds are made using a mixture of sand, clay and water. In days gone by the mixture would have been used as it was dug out of the ground, hence it was termed a natural greensand. Greensand moulding is usually a semi-automated process these days. Therefore I would suggest that the foundry you are going to visit has a dedicated moulding line, or lines, for specific types of components which they would likely produce in reasonably large volumes.

 

[oranjeep]

Thanks for the information. This will prepare me a lot better.

 

[arunmrao]

The term green is used as the sand mixture is not baked. The strength obtained after mold compaction is called as green strength. This is similar to unsintered P/M compacts which have been formed but not sintered.

 

[oranjeep]

"unsintered P/M compacts"-What is that?
The sand mixture has to be baked?
What type of sand? How is it baked?

 

[TVP]

P/M means powder metal. Powder metal components are sintered after pressing in order to increase strength. Sand molds for casting can similarly be baked in order to improve their strength. It is not mandatory that molds are baked-- hence green sand casting using unbaked molds. There are many different types of foundry sand-- zircon, olivine, etc. Try the following site for more information:

http://www.afsinc.org/

 

[oranjeep]

Thanks for the information. I will check out the AFSINC web site. This will really help.