Thin-walled die-cast components, due to their high strength and lightweight characteristics, are widely used in various fields such as the metal casings of mobile phones and tablet computers, electric vehicles, and aircraft components. However, after the die-casting process, these components often exhibit irregular curvature deformations, which are difficult to meet the tolerance requirements. Moreover, such deformations are difficult to handle and have a significant impact on subsequent operations such as automatic welding and assembly. Therefore, a flatness correction treatment must be carried out.