论文部分内容阅读
型材拉弯成形过程模拟属于高度非线性准静态问题,选择动力显示模块进行数值模拟时,需要考虑模拟分析步时间的敏感性。针对通用的型材拉弯工艺,在模拟分析步时间的敏感性分析基础上,采用ABAQUS/Explicit模块,建立了型材拉弯成形的准静态分析有限元模型。并采用ABAQUS/Standard模块分析预测回弹、侧壁厚度和截面畸变。为验证模拟方法的有效性,采用A-7B数控拉弯成形机完成2024-O铝合金Z型截面型材拉弯试验,测量试验件的回弹量、厚度和截面畸变情况。试验与模拟结果对比表明:补拉伸量对回弹量、厚度和截面畸变的影响趋势一致,其中,回弹量和厚度的平均相对误差分别为13.74%,1.66%。建立的模型能有效地应用于铝合金型材拉弯成形模拟。
Profile bending bending process simulation is a highly nonlinear quasi-static problem, the choice of dynamic display module for numerical simulation, the need to consider the simulation analysis of step-time sensitivity. Aiming at the common profile bending process, based on the analysis of the sensitivity of step analysis, the finite element model of profile analysis was established by ABAQUS / Explicit module. The ABAQUS / Standard module was used to predict rebound, sidewall thickness and section distortion. In order to verify the validity of the simulation method, A-7B CNC bending machine was used to finish the bending test of 2024-O aluminum alloy Z profile section, and the springback amount, thickness and section distortion of the test piece were measured. The comparison between the experimental and simulation results shows that the effects of the amount of stretch on the springback, thickness and section distortion are consistent. The average relative error between springback and thickness is 13.74% and 1.66% respectively. The established model can be effectively applied to the bending and forming simulation of aluminum alloy profiles.