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为了简单有效地控制高强度钢的回弹,研究了校正力对板料弯曲回弹的影响.根据校正弯曲受力特点,在考虑了应力-应变分布、受力边界条件、刚塑性材料模型和梅西屈服准则的基础上,建立了校正弯曲下的回弹预测模型,确立了校正力和回弹之间的对应关系.进一步采用自制的1t伺服压力机进行了试验,结果表明:增大校正力能有效降低回弹,回弹预测值和试验值一致,校正弯曲回弹预测模型能够提供较为真实的近似解;合理设置校正力可以有效控制和稳定回弹,为高强钢的回弹控制提供了简单有效的措施;回弹预测模型建立了校正弯曲力和回弹之间的定量关系,为模具及工艺参数的设置提供了可靠的依据.
In order to control the rebound of high-strength steel simply and effectively, the influence of the correcting force on the bending rebound of the sheet metal is studied. According to the characteristics of the bending stress correction, considering the stress-strain distribution, the stress boundary conditions, the rigid plastic material model Based on Messier’s yield criterion, a prediction model of springback under bending correction was established, and the corresponding relationship between spring force and springback was established.Further experiments were carried out by using a homemade 1t servo press.The results showed that: Force can effectively reduce the rebound, the predicted rebound value is consistent with the experimental value, and the corrected curved rebound prediction model can provide a more realistic approximation solution. Reasonable setting of the correction force can effectively control and stabilize the rebound, providing the rebound control of high strength steel The simple and effective measures were taken. The springback prediction model established the quantitative relationship between the correction of bending force and springback, which provided a reliable basis for the setting of mold and process parameters.