【作者】 龚攀； 莫健华； 韩飞； 王新云；

【Author】 Gong Pan;Mo Jian-hua;Han Fei;Wang Xin-yun;State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology;

【机构】 材料成形与模具技术国家重点实验室华中科技大学；

【摘要】 金属板材数字化渐进成形过程中存在回弹变形问题,严重影响零件的形状和尺寸精度。本研究将控制学理念引入金属板材数字化渐进成形工艺,建立了数字化渐进成形精度闭环控制模型,提出一种基于快速傅里叶变换的改进型闭环控制算法。利用该算法预测出理想的轨迹型面的形状,根据预测结果对加工轨迹进行调整,以期实现三维曲面的精确成形。利用此方法对浅碟形零件数字化渐进成形的轨迹型面设计进行了数值模拟验证,模拟结果表明通过三次轨迹型面修正可获得满意的工件,证实了基于闭环控制的数字化渐进成形回弹补偿算法的有效性。更多还原

【Abstract】 There exists the problem of springback during the sheet metal incremental forming process, which affects the shape and accuracy of the workpiece. In this study, a closed loop control model was built up for compensating the springback and enhancing the precision of the workpiece. A closed loop algorithm of trajectory profile for the incremental sheet forming based on the fast Fourier transform was proposed. The profile of processing tool path of shallow dishing with spherical surface was designed on the basis of the profile correction algorithm. The springback tests of workpiece forming, needed in the iterative process of closed loop control system, were substituted by finite element model(FEM) simulation. The results shows that the algorithm can predict an ideal profile of processing track and the springback error of incremental sheet forming is eliminated effectively. It has good convergence efficiency and can improve the workpiece dimensional accuracy dramatically.更多还原