Analytical-Numerical Simulation Of Springback Of NC Tube Bending

Numerical control tube bending has been widely applied in fields of aerospace, aviation and automobile because of its light weight, high strength, precision, high efficiency and some other advantages, however, tube bending's quality is determined by the springback value after forming, so to study springback mechanism, predict springback value, quantificationally analyze the effect from technology and die parameters on springback value has an important significance in not only theory research but also practical application. An introduction to the project and its main results are as follows:Through studying deeply the process of NC tube-bending and its springback, different analytic models of springback prediction corresponding to curve section and transition section of tube-bending have been established, and at one tune a new method that merged rigid-plastic FEM to compute stress field during the process of NC bending and established prediction model to predict springback value was mentioned, which make analyze rapidly and practically tube-bending's springback possible.Based on Visual C++ and Oringin technology, NC tube-bending springback prediction system has been developed, which provides an effective means to predict,analyze, control the process of NC tube-bending's forming and springback so as to raise its quality and shorten production development cycle.After studying the effect from angle bending, material hardening exponent, relative radius bending and strength coefficient on springback value with developed numerical control tube-bending springback prediction system, some laws obtained are as follows: with some NC bending conditions, (1) Within some range, tube-bending's springback angle has an approximate linear relation to angle bending; (2) When bending angle is small, the larger relative radius bending is, the larger springback angle is; however, with bending angle increasing, contrary result happens; (3) The larger material hardening exponent is, the less springback angle is; (4) The larger strength coefficient is, the larger springback angle is.