Aluminum is an extremely versatile metal which is able to used to creat parts by casting, forging, machining or extrusion. Aluminum casting and aluminum extrusion are the two similar, but not the same manufacturing methods that most of people may confuse. And, you may ask “What is the difference between aluminum casting and aluminum extrusion?” CFS Foundry is the experienced aluminum casting foundry in China, so we well know the differences between these two processes, now let’s discuss them in detail.
Aluminum can be cast using different casting methods. Typical aluminum casting methods include: gravity die casting, pressure die casting, sand casting, investment casting, etc. Each casting method has its own features, and we could select the right aluminum casting method according to the design of the part. Despite the different names and methods, all casting has one thing in common: Aluminum alloy has to be melted and poured into a mold and waits for solidification after cooling.
Aluminum casting is a custom process that can creat parts in a wide range of shapes and dimensions. Complex parts like automotive engine blocks, exhaust manifolds ,etc are all produced by aluminum casting technique. This process is a repetitive work that can cast the product thousands of or even more times, so large volume production is supported. Common aluminum casting alloys are: A356 , A380, etc.
Aluminum extrusion is the process by forcing a heated aluminum billet through a die to produce the desired cross-section. Different from aluminum casting, the extruded aluminum part could be cut to a proper length and subjected to further machining or fitting to a final product. Normally, for a new designed part, the custom extrusion process will take as long as two months. Extruded aluminum shapes are also produced with an excellent surface finish and are typically stronger in comparison. Some products produced by the extrusion process are heat sinks, window and door frames, manifolds, and lighting track equipment. The possibilites are endless. A disadvantage of extrusion when compared to casting is the size constraint. Aluminum extrusions are limited by the size of both the billet and the capacity of the cylinder on the extrusion press. Castings have no such limit and are often used to produce very large items. Even with the size limitations of extrusions, there are still a myriad of applications of which this method of manufacture is the preferred choice.
If you still doubt when to use aluminum casting or aluminum extrusion, pls freely contact us!