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针对单曲形蒙皮零件,建立了有限元数值模拟的离散模型和等效模型,通过对成形计算时间、垫层变形量和成形零件外形的比较,验证了等效模型的高效性和可靠性.为了消除垫层变形和板料回弹对成形精度的影响,采用有限元等效模型技术,基于位移调整法,提出了先进行板料回弹补偿再进行垫层变形补偿的模面补偿算法,并应用该算法分别对单曲形和双曲形蒙皮零件进行了拉形模面补偿分析.在得到的补偿模面上进行了单曲形和双曲形蒙皮零件成形试验,采用非接触光学测量系统进行数字化测量后,发现成形零件外形误差均在允许范围(±0.5 mm)之内,满足精度要求,验证了该模面补偿算法的有效性.
For single curved skin parts, the discrete model and equivalent model of finite element numerical simulation are established. By comparing the forming time, the deformation of cushion and the shape of the formed part, the efficiency and reliability of the equivalent model are verified In order to eliminate the influence of cushion deformation and sheet springing on the forming accuracy, the finite element model of equivalent model was used to calculate the surface compensation algorithm , And the algorithm is applied to the single and double curved skin parts of the tensile mold surface compensation analysis of the compensation surface in the single and double curved skin parts forming test using non- After the optical measurement system was digitally measured, it was found that the shape error of the formed parts was within the allowable range (± 0.5 mm), meeting the accuracy requirements, which verified the effectiveness of the surface compensation algorithm.