一种柔性变压边力的智能冲压过程研究  

Research on Intelligent Stamping Process of Flexible Variable Blank Holder Force

作　　者：付泽民 乔涛涛 张而耕 赵志繁 FU Zemin;QIAO Taotao;ZHANG Ergeng;ZHAO Zhifan(Shanghai Engineering Research Center of Physical Vapor Deposition(PVD)Superhard Coating and Equipment,Shanghai Institute of Technology,Shanghai 201418,China)

机构地区：[1]上海应用技术大学上海物理气相沉积(PVD)超硬涂层及装备工程技术研究中心

出　　处：《机床与液压》2020年第2期40-44,共5页Machine Tool & Hydraulics

基　　金：上海科委重点支撑计划(26220I180010);上海市联盟计划项目(LM201754)

摘　　要：板料成形时易产生破裂、起皱以及尺寸和形状精度不良的倾向。在伺服压机的基础上,研究一种柔性可变压边力的独立加载闭环控制系统。选择圆筒形工件为模拟对象,利用有限元软件分析圆筒形工件在不同定值下及变压边力下冲压仿真结果。比较得到成形圆筒形工件的最优压边力曲线以及冲压载荷随时间变化的曲线,加载到装置的控制系统,使压边单元与板材始终处于贴合状态。该闭环系统通过压机变载、变行程等不同的运动模式协同柔性压边装置对冲压成形过程进行控制,柔性控制压边力和冲模载荷,来适合零件不同变形阶段的特点。实验证明:该系统可以最大限度提高金属板材成形性能,不仅防止了板材变薄在尾部产生褶皱以及工件拉裂的情况,而且可以提高板材拉深极限。Sheet metal forming is prone to fracture,wrinkling and poor dimensional and shape accuracy.Based on the servo press,a closed-loop control system of independent loading with flexible and variable blank holder force was studied.The cylindrical workpiece was selected as the simulation object,and the simulation results of the cylindrical workpiece under different fixed values and variable blank force were analyzed by using the finite element software.The optimal blank holder force curve and the curve of the stamping load changing with time of the forming cylindrical workpiece were compared and loaded into the control system of the device,so that the blank holder unit and the sheet metal were always in the fitting state.The closed loop system controlled the forming process of stamping through the flexible beading device with different motion modes,such as variable load and variable stroke,and flexibly controlled the beading force and the load of punching die,so as to adapt to the characteristics of different deformation stages of parts.Experimental results show that the system can maximize the sheet metal forming performance,not only prevent the sheet thin in the tail of the fold and the workpiece tension,but also can improve the sheet deep limit.

关 键 词：伺服压机 圆筒形工件 变压边力 控制系统 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置]