Reasons for curling and deformation during perforated metal sheet manufacturing

During the manufacturing process of CNC punched sheet metal, plates of various materials will deform to varying degrees after processing. Some plates will even become cylindrical after processing. What causes this unevenness? Reason 1: It's related to the material. Different materials deform to different degrees after punching. Stainless steel deforms the most and is difficult to flatten. This is because stainless steel has a certain degree of toughness, making it difficult to achieve the same flatness as before punching. Reason 2: It's related to the hole diameter and spacing. The smaller the holes and the denser the spacing, the worse the flatness. During CNC punching, the punching process between the punch and the stainless steel plate is equivalent to annealing the stainless steel, making the plate harder and more difficult to flatten. Reason 3: The edge margin of the plate affects flatness. The larger the edge margin, the worse the flatness, especially with a large opening ratio, large hole diameter, and large blank edges on all four sides. However, don't worry, we have professional leveling equipment and will do our best to level the plates for customer convenience. In summary, after the perforated metal sheets (perforated plates, round hole mesh, sieve plates) are processed, they all need to be leveled. "Leveling" refers to using a leveling machine or similar equipment to restore the CNC-punched perforated plate to its original flat state. Furthermore, the perforated plate is usually cleaned after leveling, during which a lubricant is used to ensure a cleaner CNC-punched plate.