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The Camshaft is a shaft with one or more cams attached to it, especially one operating the valves in an internal-combustion engine or in other words it is a shaft to which a cam is fastened or of which a cam forms an integral part.
Camshafts can be made out of several types of material which include:
Chilled iron castings: Commonly used in high volume production, chilled iron camshafts have good wear resistance since the chilling process hardens them. Other elements are added to the iron before casting to make the material more suitable for its application.
Billet Steel: When a high quality camshaft or low volume production is required, engine builders and camshaft manufacturers choose steel billet. This is a much more time consuming process, and is generally more expensive than other methods. However, the finished product is far superior. CNC lathes, CNC milling machines, and CNC camshaft grinders will be used during production. Different types of steel bar can be used, one example being EN40b. When manufacturing a camshaft from EN40b, the camshaft will also be heat treated via gas nitriding, which changes the micro-structure of the material. It gives a surface hardness of 55-60 HRC. These types of camshafts can be used in high-performance engines.
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