Causes and preventive measures of surface quality defects in stainless steel cold bending
Publish Time: 2025-01-27
Stainless steel cold bending is a metal forming process widely used in the fields of construction, automobiles, aerospace, etc. However, during the cold bending process, various quality defects may occur on the surface of stainless steel, which not only affects the aesthetics of the product, but also may weaken its mechanical properties and corrosion resistance. This paper aims to explore the causes and preventive measures of surface quality defects in stainless steel cold bending.
Common surface quality defects in stainless steel cold bending include scratches, pits, bulges, cracks, and oxide film damage. The causes of these defects are varied, mainly due to problems with the material itself, improper process parameter settings, and negligence during operation.
Scratches are usually caused by scratches on hard objects or uneven particle size of polishing wheels. During the cold bending process, the stainless steel surface contacts hard objects such as molds and clamping devices. If there are sharp edges or particles on the surface of these hard objects, it is easy to leave scratches on the stainless steel surface. Pits and bulges may be caused by internal defects in the material, uneven force during processing, or excessive temperature. Cracks are more related to the toughness of the material, the cold bending angle and the bending speed. As for the damage of the oxide film, it is because the oxide film on the surface of the stainless steel is damaged during the cold bending process, resulting in a decrease in corrosion resistance.
In order to prevent these surface quality defects, the following measures can be taken: First, strengthen the quality control of raw materials to ensure that there are no scratches, pits and other defects on the surface of the stainless steel material, and the internal structure is uniform and free of inclusions. Secondly, optimize the cold bending process parameters, such as selecting the appropriate bending angle, bending speed and mold shape to reduce the uneven force and high temperature of stainless steel during the bending process. In addition, hard objects such as molds and clamping devices should be inspected and maintained regularly to ensure that their surfaces are flat and free of sharp edges or particles.
During the operation, the operator should strictly abide by the operating procedures to avoid unnecessary friction and collision between the stainless steel surface and hard objects. At the same time, stainless steel components that have already had surface quality defects should be repaired or replaced in time to ensure the quality of the final product.
In summary, the causes of surface quality defects in stainless steel cold bending are complex, but by strengthening raw material quality control, optimizing process parameters, regularly inspecting and maintaining hard objects, and strictly abiding by operating procedures, these defects can be effectively prevented and the quality and performance of stainless steel components can be improved.
