材料性能波动对板材折弯回弹的影响规律研究

Material Properties Fluctuation Effects on Bending Springback of High Strength Steel

为研究高强钢板材料性能波动对折弯回弹的影响,采用正交试验方案对高强钢板取样并进行单拉试验,通过分析单拉试验数据发现材料力学性能波动很大。参照实际折弯机工况建立了折弯工艺的有限元模型,与折弯试验数据对比验证了有限元模型的准确性。最后将所有单拉数据分别输入有限元模型中进行计算,结果表明材料力学性能的波动对高强钢板的折弯回弹幅度影响较大,其中材料厚度对折弯回弹幅度影响达到了2.12°,材料方向对其影响达到了0.21°。

This paper has studied how material properties fluctuation effects on bending spring back of the high strength steel, through uniaxial tensile tests by sampling based on the orthogonal test, and found out the material mechanical properties have great fluctuation by analyzing the uniaxial tensile test data. Then FE model is established according to working condition of the actual bending machine, and the model is proved to be accurate by comparing the simulated result with the bending experimental result. At last all the uniaxial tensile data are input into the FE model respectively and the result shows that the fluctuation of the material properties has a great influence on the bending springback of the high strength steel, among which the influence of material thickness on the bending springback has reached to 2.12° and material orientation to 0.21°.