Lost foam casting is a unique type of casting process. Unlike other casting processes which have many years of history and development, Lost foam was patented as we know it in 1964. T.R. Smith patented a process that utilized a polystyrene pattern supported by loose, unbonded sand as the molding media. Most of the early process development took place in automotive research facilities. The process took off when the Smith patent expired in 1981. Lost foam casting has gained a foothold as a go-to casting method for complex castings, particularly effective where complex internal passages are desired. Lost foam has proven useful in a variety of applications beyond the automotive manufacturing industry.
What is Lost Foam–and what it has to offer
Lost foam casting is a little different from other manufacturing processes. Rather than using a steel mold like in die casting, the mold is made from expanded polystyrene foam, which is supported by loose, unbonded sand, packed in on all sides. As metal is poured into the mold, the foam evaporates, leaving behind an exact metal replica of the foam pattern. This process doesn’t require additives, binders, or cores (thus a very environmentally friendly casting process) and creates near-net shape components. It can handle a wide range of part sizes and materials, though at American Foam Cast, we primarily work with aluminum, as this lightweight, durable metal pairs well with the lost foam casting process.
Like any manufacturing process, lost foam has its advantages and disadvantages, and it has a lot to offer manufacturers of any type. Its ability to handle high-complexity components makes it easier to pack more functionality into a single part, which helps to improve the efficiency of the assembly process down the line for the end-use product and reduces material waste and component weight–a valuable factor in many industries these days. It’s also much more flexible and less energy intensive than parts made from other casting processes, so while lost foam has start-up costs similar to high pressure die casting, it’s actually much more economical in the long run, especially when you start putting more functionality into a single part–you won’t need to cast multiple parts just to fill one purpose in the assembly.
The Applications of Lost Foam Casting
, Though automotive components originally dominated the lost foam landscape, the process has started seeing more use in many other industries, especially in recent decades. For instance, here at American Foam Cast, we use lost foam casting to serve niche sectors of automotive and transportation manufacturing, like electric vehicles, heavy trucking, railroad equipment, and marine components. It’s also excellent for commercial and consumer products, like internal components for lawn and garden equipment, and consumer power generators. Lost foam casting is still in its’ youth , but it has shown a lot of promise as technology continues to advance and more and more manufacturers are in need of highly complex components to meet the ever-increasing demand for progress.
Looking for an expert in lost foam casting?
At American Foam Cast, lost foam casting is our specialty! Head over to our website to learn more about how we can use lost foam aluminum casting to help you with your next project!
