What kind of data do larger foundries generally store? Composition of every melt? Thermal history of each casting? Quality variables?
What are the main quality parameters for castings of ductile iron (spheroidal graphite iron)? Sorry if I am using poor terminology - I have heard these terms mostly in the local language here.
What variables affect nodularity significantly? Thermal history can contain several variables (or one can consider the whole temperature-time profile), but presumably only three-four thermal variables could be significant. In one example, I have seen three GRFs. It seems they are calculated based on empirical equations, and am wondering if it would not be better to only include the composition instead of GRFs. Do all GRFs improve nodularity?
What are the main causes of rejects (castings not meeting specifications)? Poor nodularity? What can they do to reduce rejects? I am trying to find out if I can correlate some quality variables with thermal history and composition, which can help reduce rejects.
Thanks for any information.
With kind regards,
A. Bulsari