薄壁管数控弯曲成形过程有限元模拟系统的研究

DEVELOPMENT OF FEM SIMULATION SYSTEM FOR THIN- WALLED TUBE NC BENDING PROCESS

建立了合理有限元分析模型,研究了有限元系统中单元的选取,边界和摩擦条件的处理,迭代收敛因子的确定以及起皱预测准则的建立等关键技术的处理。在此基础上自主开发了可预测起皱的薄壁管数控弯曲成形过程三维刚塑性有限元模拟系统。同时对该有限元系统的起皱预测结果进行了验证,并给出了一些模拟结果。

Thin-walled tube NC bending process will be widely employed in automobile and aviation industries for its high efficiency, precision and satisfaction of lightweight products. The deform law of this process must be studied in order to totally manufacture qualified parts by obtaining optimized parameters. The key problems concerned with the FEM simulation system, such as element election, boundary condition and friction are studied. A 3D rigid-plastic FEM simulation system is developed for the thin-walled tube NC bending process based on the above research. Moreover the stress distribution during the process with varied rotate velocity of the bend die is analyzed.