拼焊板V形自由弯曲精确回弹控制技术研究  

Development of Precise Spring-back Control System of Tailor Welded Blanks Air Bending Process

作　　者：段永川[1] 官英平[1] 

机构地区：[1]先进锻压成形技术与科学教育部重点实验室(燕山大学),秦皇岛066004

出　　处：《机械工程学报》2014年第10期40-47,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51275444);教育部高等学校博士学科点专项科研基金(20121333110003)资助项目

摘　　要：在平截面和平面弯曲等假设条件下,建立拼焊板V形可适于小曲率自由弯曲回弹的解析预测模型,所建立的回弹预测模型将成形过程分段研究,即区分为贴模阶段和未贴模阶段。分别根据贴模态和未贴模态拼焊板弯矩分布特点,构建两种状态下的曲率分布方程。在自由弯曲卸载分析阶段,引入两母板间相互作用的弯矩,同时考虑弹性模量随塑性变形变化的影响,基于单一母板求解拼焊板母板回弹后的弯曲角。基于2D单应矩阵变换法实现拼焊板回弹后端面弯曲角的在线测量。针对板料中材料参数的波动性问题,基于正交表构建最佳行程预测的神经网络模型的训练样本。根据软硬件接口基于LabVIEW软件平台开发可在线学习的拼焊板V形自由弯曲回弹控制系统软件。设定目标回弹后弯曲角分别为140°和100°时,跟踪在线成形试验结果,成形第5周期最大点误差可分别达到1.42%和2.01%。The analytical springback prediction model of tailor welded blanks（TWBs） for air bending process is put forward for small curvature bending,the forming process is divided into no warp-around condition and warp-around condition respectively.At the air bending unloading phase,the interaction moment of the two parent blanks is introduced to the model in which the variable modulus is included with plastic deformation proceeding,the unloaded angle is obtained based on a single parent plate in the analytical model.An online method for measuring unloaded angle is used based on two dimension homography matrix transformation method.In the springback control system,the training set is constructed using orthogonal table to include the material parameter fluctuation.The TWBs springback control system is developed using LabVIEW software platform.In the springback control system,the target unloaded angles 140° and 100° are set,the maximum manufacturing errors are decreased to 1.42％ and 2.01％ respectively by tracing the online results after 5 cycles.

关 键 词：拼焊板 自由弯曲 回弹控制 

分 类 号：TG386[金属学及工艺—金属压力加工]