Crankshaft is one of the most important components of automobile engine. For automobile crankshaft, its main function is to realize the power output of engine. On the one hand, it bears the influence of fatigue factors such as torsion and bending, on the other hand, it also needs to bear the impact of crankshaft connecting rod. From the inspection data of crankshaft damage, the impact of crankshaft wear, torsion and bending on the crankshaft accounts for the majority. Therefore, for the wet sand casting process of crankshaft, while reasonably selecting the crankshaft material, we should also analyze its wet sand casting process, reduce the wet sand casting defects of crankshaft, and effectively control the quality of castings in the wet sand casting process, So as to ensure the qualified rate of wet sand casting and improve the benefit of wet sand casting production.

Due to the particularity of the crankshaft, the material is required not only to have good mechanical properties, but also to ensure the material economy of the crankshaft. Nodular cast iron is an alloy material with good mechanical properties and economic rationality. Compared with other cast steel materials, nodular cast iron not only has good torsion and bending resistance, but also shows great advantages in the face of the impact transmitted by the crankshaft connecting rod. The automobile crankshaft adopts qt900-2 to improve the nodular cast iron structure by adding different elements, Meet the needs of automotive crankshaft applications.

The production practice shows that the ductile iron crankshaft cast by wet sand mold greatly simplifies the production process of ordinary crankshaft, can meet the mechanical properties of engine crankshaft and reduce the production cost of crankshaft. At the same time, for the control of defects of wet sand mold castings, the casting defects in the process of wet sand mold casting are also easy to overcome or even eliminate in the process, This ensures the quality of the crankshaft.