بررسي نقش ضريب اصطكاك و نيروي نگهدارنده در فرآيند بازگشت فنري در خمش U شكل ورق هاي غير ايزوتروپ«يادداشت پژوهشي»

An Investigation into the Effect of Friction and Blank Holden Force on the Springblak of U-bending of an Isotropic Plates

Accurate prediction of springback is essential for the design of tools used in sheet metal forming. One of the major causes for the production of inconsistent part is springback, the elastic recovery in the material after the tooling is removed. In this paper, the numerical simulation of springback and side wall curl in U-bending has been performed. This operation presents a complex form of springback and side wall curl occurr ing in sheet metal forming since the sheet undergoes stretching, bending and unbending deformations. The effects of some parameters such as coefficient of friction and blank-holder force on the springback and side wall curl are studied. The results show that the role of friction and blank-holder force in the U-bending process is considerable. For instance, springback and side-wall curl initially increase with raising the coefficient of friction and blank-holder force but they decrease again when they go beyond certain values.