engleski

SPRINGBACK

When producing a part, either by deep drawing, stretch forming or bending, flat sheet is transformed into a design shape and dimension. At the end of the forming process, when the part has been released from the forces of the forming tool, there is a distortion in the shape and dimension of the formed oart. This distortion is termed springback. A depriction of springback in a simple bend can be. Springback is inherent in sheet metal forming. It can be can be understood by looking at a material is stress stain curve (discussed in the module on Tensile Testing) which characterizes the behaviour of metal under applied force. During forming, the material is strained beyond the yield strength in order to induce permanent deformation. When the load is removed, the stress will return to zero along a path parallel to the slope of the elastic portion of the curve, which is the elastic modulus. The permanent deformation will therefore be less then what is designed into the part unless springback is factored in. Springback dependent on various material material characteristics but can be affected by tooling desing. The most important parameters are elastic modulus, strength, thickness and bend radius. Other material characteristics, especially YPE, can also be important.

forming, material, springback

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