Search Results for “spring back compensation”

Source: Spring Back Compensation

'Spring back compensation is used in metal forming to ensure that the final shape assumed by a piece of metal after being removed from a forming tool is the shape desired. Typically, when metal is being formed at room temperature, it will undergo both plastic and elastic deformation. After the metal workpiece is removed from the tool or deformation implement, the elastic deformation will be released and only the plastic deformation will remain; thus, the workpiece will "spring back" to a position between its original position and the position into which it was formed. Usually, spring back compensation is realized by over-bending the material by an amount corresponding to the magnitude of the spring back.
When bending metal, spring back compensation is done by pushing the workpiece further into the die. For other sheet metal forming operations like drawing, it entails deforming the sheet metal past the planned shape of the part so that when the part's elastic deformation is released, the plastic deformation in that part delivers the desired shape of the part. In the case of complex tools, spring back must be considered in the engineering and construction phases. Complex software simulations are often used, but frequently this is not enough to deliver the desired results. In such cases practical experiments are done, using trial-and-error and experience to correct the process. However, the results of the process are only stable if all influencing factors are the same. These include such things as yield strength, chemical composition, aging processes, and structure of the workpiece; tool wear; and temperature and deformation rate during the forming process.
Spring back assessment of final formed products is a difficult problem and is affected by the complexity of the formed shape. The NUMISHEET 93 conference benchmark problem involves the draw bending of a U-channel using three measured parameters. Parameter-less approaches have been proposed for more complex geometries but they need validation.