What manufacturing process is commonly used for making crankshafts?

The manufacturing process most commonly used for making crankshafts is drop forging. This method is particularly suitable for high-strength components such as crankshafts, which experience significant stress and strain during operation.

Drop forging involves shaping metal by applying compressive forces using a hammer or press, which allows for the production of crankshafts with improved mechanical properties due to the work hardening of the material. The process produces a nearly net shape component with enhanced density, toughness, and a fine grain structure, which are crucial for the durability and performance of crankshafts in engines.

While casting is also used in some contexts for creating crankshafts, drop forging typically results in stronger components that can better withstand the harsh conditions faced within an engine environment. Other processes like injection molding and sintering are not applicable in this case, as they are more suited for producing plastic or powder metallurgy parts rather than high-strength steel components.