Leveling machines, also known as straightening machines or flattening machines, are placed between the material rack (or cutting and welding machine) and the feeding machine for leveling and advancing rolled materials. They are commonly used equipment in sheet metal processing, and the design of leveling machines primarily depends on the thickness, material, and requirements of the material to be leveled. Thicker materials require higher structural rigidity, fewer rolls, larger roll diameters, and greater power; the opposite is true as well.