Springback in sheet metal bending refers to the phenomenon that the actual shape and size of the workpiece deviate from the mold design value due to the recovery of elastic deformation after the metal sheet is bent.
Specifically, after the workpiece leaves the mold, its radius of curvature increases and the bending angle decreases.
Causes of springback
Springback is due to the simultaneous plastic deformation and elastic deformation of the material during the bending process. Plastic deformation is permanent, while elastic deformation recovers after the external force is removed, resulting in changes in the shape and size of the workpiece.
Factors affecting springback
Material mechanical properties: The yield strength and elastic modulus of the material have a significant effect on springback. Materials with high yield strength and low elastic modulus have more obvious springback.
Bending radius to thickness ratio: The smaller the ratio of bending radius to sheet thickness, the higher the proportion of plastic deformation and the smaller the springback.
Mold parameters: Too large or too small mold gap will aggravate springback; too small punch radius will increase local elastic strain.
Processing conditions: When the bending angle increases, the springback accumulation increases; work hardening causes the material resistance to increase and the springback intensifies.
Methods to reduce springback
Reasonable design of mold gap: Ensure that the mold gap is moderate, avoid being too large or too small.
Optimize the radius of the punch corner: Select the appropriate radius of the punch corner to reduce local elastic strain.
Control the bending angle: Avoid too large or too small bending angles to reduce springback accumulation.
Use appropriate work hardening treatment: Reduce the elastic recovery ability of the material through appropriate heat treatment or cold treatment.
Of course, professional sheet metal manufacturers can control the springback control in sheet metal processing very well, because professional manufacturers guarantee the quality and quantity of the delivered products, so you don’t have to worry about this. It’s very worry-free to cooperate with professional sheet metal processors.
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