摘要
金属板料单点增量成形过程中成形区域厚度减薄率过大是影响成形极限的一项重要因素,预测成形区域壁厚是控制减薄率的重要方法。选取1060铝板,对单点增量成形过程中的壁厚变形过程进行分析,利用Abaqus有限元分析软件,建立单点增量成形有限元模型,利用仿真结果拟合出精度较高的壁厚预测公式,分析工具头直径、层间距、进给速度、板料厚度、成形角度等工艺参数对减薄率的影响规律,并通过试验验证有限元模拟的正确性,并提出通过改变成形轨迹控制减薄率的方法。结果表明:拟合出的壁厚预测公式所求得壁厚值比正弦定理所求得的壁厚值更接近实验值;壁厚减薄率值随着工具头直径、成形角度和板料厚度的增大而增加,随层间距的增加而减小,进给速度对减薄率影响不显著,成形角度是影响减薄率的最重要因素;采用压入点均布的成形轨迹可有效减小减薄率。
Excessive thinning rate of deformation zone thickness in metal sheet single point incremental forming process is an important factor that influence the forming limit. Prediction of deformation zone thickness is an important way to control the rate of thinning. The process of deformation zone thickness in single point incremental forming process were analyzed, the finite element model of single point incremental forming was established by the finite element analysis software ABAQUS and the 1060 Aluminum was selected as material of sheet. A relatively high accuracy formula to predict the deformation zone thickness is fitted by using the simulation results, the impact of process parameters such as tool diameter, layer step, feeding speed, sheet thickness, forming angle on thinning rate were analyzed respectively. The correctness of finite element simulation was verified by experiment and proposed a method to control thinning rate by changing forming trajectory. The results showed that the thinness value calculated by fitted formula to predict the deformation zone thickness is more close to the experimental data than by sine theorem. Thinning rate of deformation zone thickness increases with the increase of tool diameter, forming angle and sheet thickness and the decreases of step size, the feeding speed had no significant effect on the thinning rate. The most important factor of thinning rate is forming angle. The thinning rate is effectively reduced by using pressing point uniformly distributed forming trajectory.
出处
《机械强度》
CAS
CSCD
北大核心
2017年第3期684-691,共8页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51475366
50975229)
高等学校博士学科点专项科研基金项目(20116118110005)
陕西省教育厅重点实验室科学研究计划项目(12JS072)资助~~
关键词
单点增量成形
壁厚减薄率
有限元分析
Single point incremental forming
Thinning rate
Finite element analysis
