Though they have been refined through the ages, significant differences exist between the two methods used to make metal parts.
Originally published in the April 2016 issue of Machine Design by Brad Done, Reliance Foundry Co.
Sand casting and investment casting are methods of creating metal parts by pouring molten metal into three-dimensional molds. Although methods are thousands of years old, both have been refined over the years to minimize the amount of metal used and reduce any extensive machining and finishing required. But significant differences exist between these two methods of making metal parts. First let’s take a look at the basics behind each.