摘要
管材弯曲卸载后将不可避免地产生一定回弹,严重影响弯管生产的精度与效率。基于数值回弹预测,对加工弯管的绕弯模具型面进行回弹补偿,得到新的模具型面,依然是目前降低回弹的主要措施。对以回弹为主要成形缺陷的空间弯管绕弯成形进行了研究,采用弯曲回弹对应节点位移矢量与曲线局部弗朗内特标架相结合的节点几何补偿法,对弯曲模具进行型面修改。利用数值回弹预测方法,针对回弹量多次迭代补偿,可以有效补偿回弹误差,保证空间弯管几何精度。
Aim. The introduction of the full paper reviews quite a number of papers in the open literature; to our knowledge, none of them touches upon the method mentioned in the above title, so we believe our method is new. We explain our new method in sections 1 through 4. Section 1 briefs the DA （ displacement adjustment） method in Refs. 15 and 20. The core of sections 2, 3 and 4 consists of： ＂we use the node geometric compensation method which combines the displacement vectors at the nodes corresponding to bending springback with the local Frenet frames of curves before and after the springback to modify the surface of a bending die＇ s non-planar tube. ＂ We perform twice the iteration and compensation of springback quantity, thus effectively reducing springback errors. The simulation results, given in Figs. 8 and 9, and their analysis show preliminarily that our new method can ensure the geometric accuracy of the bending of the thick-walled non-planar tube.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2011年第5期811-817,共7页
Journal of Northwestern Polytechnical University
基金
航空科学基金(2008ZE53048)
国家自然科学基金(51075332)资助
关键词
管材
模具
迭代法
模拟
算法
弯曲
回弹
厚壁空间弯管
补偿
tubes, dies, iterative methods, simulation, algorithms, bending, springback, thick-walled non-planar tube, compensation
