Foundries make metal parts: they use sand and ceramic materials to make molds and cores to make those metal parts. Sand molds and cores are made by a variety of processes, from green sand to no-bake and beyond. Cores are made through a variety of processes, too, some with tooling and some by hand. Pretty much all the processes require some form of a solid pattern.
Chunky graphite is an abnormal form of graphite commonly associated with heavy-section ductile iron castings, especially in areas having a section thickness greater than 50 mm. These “last-to-solidify” sections of a casting are the most susceptible to this form of degenerative graphite, including the area located under a riser since this feed metal is slow to solidify....More
Both pH and ADV testing of foundry sands indicate acidity and basicity, but in different ways. Foundry sand pH and ADV can change as the sand is used and reclaimed. Both pH and ADV are useful lab tests to indicate changes in sand and changes in binder reactivity you will experience....More