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Casting is considered a formative manufacturing process that uses molds to make parts. There are many types of casting and many materials that you can cast. In this article, we will only discuss metal casting, not other time-setting multi-component materials that can be cast, like epoxy.
In metal casting, molten metal is poured or inserted into a pre-made mold with cores or inserts if intricate internal geometries and cavities are needed. After the part cools and solidifies, it’s cleaned and processed to give it the desired surface finish. Sometimes this secondary operation includes CNC machining to produce even tighter tolerances or features that are not ideal for casting.
Some commonly cast parts include train wheels, bus pedals, turbine blades, and engine blocks. Cast parts are used in almost every industry, including automotive, aerospace, consumer products, and medical devices.
When designing a part, there are two commonly utilized paths to determine a manufacturing method to make the part (CNC vs casting):
Design engineers often start with a manufacturing method in mind so that the design can be realistic, manufacturable, and have features that are well-suited to that process.
On the other hand, the function of a part may require a certain size, shape, or geometry that dictates the manufacturing process. CNC machining and casting are each best-suited to certain geometries.
Choosing the correct manufacturing technique starts with considering the part’s geometry. For example, certain designs require a large amount of material removal, which can be time consuming and create excessive waste. Such designs are often good candidates for casting — for example, a hollow part with thin walls and large cavities. Complex geometries are also good candidates for casting, as they take a long time to machine.
Internal cavities are often ideal for casting as forming them with CNC machining can be incredibly complex. This is especially true for sealed internal cavities that require assembly or metal joining processes in addition to CNC machining. In contrast, casting lets you simplify the design of a part or assembly. Instead of machining many small parts and assembling them, you can cast the entire part and eliminate assembly steps.
Casting is considered a formative manufacturing process that uses molds to make parts. There are many types of casting and many materials that you can cast. In this article, we will only discuss metal casting, not other time-setting multi-component materials that can be cast, like epoxy.
In metal casting, molten metal is poured or inserted into a pre-made mold with cores or inserts if intricate internal geometries and cavities are needed. After the part cools and solidifies, it’s cleaned and processed to give it the desired surface finish. Sometimes this secondary operation includes CNC machining to produce even tighter tolerances or features that are not ideal for casting.
Some commonly cast parts include train wheels, bus pedals, turbine blades, and engine blocks. Cast parts are used in almost every industry, including automotive, aerospace, consumer products, and medical devices.
When designing a part, there are two commonly utilized paths to determine a manufacturing method to make the part (CNC vs casting):
Design engineers often start with a manufacturing method in mind so that the design can be realistic, manufacturable, and have features that are well-suited to that process.
On the other hand, the function of a part may require a certain size, shape, or geometry that dictates the manufacturing process. CNC machining and casting are each best-suited to certain geometries.
Choosing the correct manufacturing technique starts with considering the part’s geometry. For example, certain designs require a large amount of material removal, which can be time consuming and create excessive waste. Such designs are often good candidates for casting — for example, a hollow part with thin walls and large cavities. Complex geometries are also good candidates for casting, as they take a long time to machine.
Internal cavities are often ideal for casting as forming them with CNC machining can be incredibly complex. This is especially true for sealed internal cavities that require assembly or metal joining processes in addition to CNC machining. In contrast, casting lets you simplify the design of a part or assembly. Instead of machining many small parts and assembling them, you can cast the entire part and eliminate assembly steps.