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针对U形件弯曲回弹问题,在Abaqus软件中建立6061铝合金薄板U形件拉延成形二维有限元模型,使用Numisheet’ 2011会议回弹测量方法和成形极限图缺陷判据,研究U形件成形过程中单工艺参数对回弹量的影响,通过L_9(3~4)正交试验获取U形件回弹控制最优工艺参数组合。结果表明:不改变其他成形工艺参数,U形件回弹量随着凸、凹模圆角半径或拉延深度的加大,总体呈上升趋势,随凸、凹模间隙值的减小总体呈下降趋势;U形件回弹量随"凸模-板料"摩擦因数的增大而增大,随"凹模、压边圈-板料"摩擦因数或压边力的增大而减小;成形工艺参数影响U形件回弹量的主次顺序依次为"凹模、压边圈-板料"摩擦因数、"凸模-板料"摩擦因数、凸、凹模间隙值、压边力,以优水平工艺参数组合A_2B_3C_1D_3进行成形模拟,U形件法兰端部最大位移偏移量为0.84 mm,回弹控制效果明显。 相似文献
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以HSLA420高强钢U形结构支撑件为研究对象,在使凸、凹模的间隙、摩擦因数、压边力等因素对其回弹影响最小的基础上,用Dynaform软件对成形及回弹过程进行模拟,研究凸、凹模圆角半径变化时支撑件回弹值的变化。采用单一变量法,分别以不同大小的凸、凹模圆角半径为自变量,相应支撑件两臂之间的回弹值为因变量,作出凸、凹模圆角半径-回弹值的曲线,分析凸、凹模半径变化时回弹值的变化规律,并选择合适的凸、凹模圆角半径使支撑件的回弹值接近零,能够不用整形或仅需一次整形将支撑件的圆角部分调整到符合工艺要求的尺寸,避免多次整形造成圆角处材料过度变薄,造成冲压件出现裂纹等缺陷。 相似文献
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《锻压技术》2019,(12)
基于自行设计制造的回弹实验模具,针对帽形件进行了大量的实验研究与分析,比较了HC420LA、HC420/780DP和QP980这3种不同性能的高强度钢板在不同U形弯曲成形的冲压工艺及不同成形状态下的回弹规律,为实际生产和设计提供理论指导。结果表明:任一冲压工艺下,HC420LA钢的回弹都远小于HC420/780DP钢与QP980钢;帽形件侧壁回弹在自由弯曲成形工艺下最小,法兰边回弹在中间预压料弯曲成形工艺下最小,而带压边力弯曲工艺下的回弹始终最大;随料厚的增加,3种高强度钢板的回弹不断减小,但料厚为1.4 mm的QP980钢进行中间预压料弯曲成形时,回弹呈反向增大的趋势;3种高强钢板的回弹随凸凹模间隙的增大而增大,180~280 kN压边力区间对HC420/780DP钢和QP980钢影响较小,而板料法兰边回弹随弯曲角度的增大而增大。 相似文献
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基于有限元理论与选定的回弹角度判定标准,采用Dynaform软件探究了汽车U形件在弯曲成形过程中压边力、摩擦系数、板料厚度和凸模圆角半径对回弹的影响。研究结果表明:回弹角度随板料厚度增厚而降低,随凸模圆角半径增加而增加,随压边力增大先增大后减小,随摩擦系数增加先增大后减小。不同因素对回弹影响程度并不相同,在选定参数范围内板料厚度因素影响最明显,压边力次之,摩擦系数略低于压边力,凸模圆角半径影响最小。 相似文献
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考虑包辛格效应的高强钢U型件冲压回弹规律分析 总被引:1,自引:0,他引:1
回弹问题限制高强钢的广泛使用。数值模拟预测高强钢回弹的精度很大程度上取决于所应用的材料模型是否能对材料的包辛格效应准确描述。本研究旨在将力学解析方法、数值模拟技术、响应面分析法综合应用于高强度薄钢板U型件冲压回弹的预测中。基于考虑包辛格效应的材料模型实现高精度模拟预测回弹,随后利用理论解析方法结合有限元模拟与响应面法分析压边力、摩擦系数、模具圆角半径对回弹的影响规律。结果表明,摩擦系数较小时,板料的回弹程度随压边力的增大而减小;而摩擦系数较大时,板料的回弹程度随压边力的增大而增大。选择合适的模具圆角半径可以显著减小零件的回弹量。 相似文献
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高强度钢板U形件冲压回弹的仿真研究 总被引:1,自引:1,他引:0
利用Dynaform软件对高强度钢板U形件在不同成形参数下的回弹情况进行了模拟分析,着重研究了压边力和摩擦因数对回弹的影响,并通过试验对模拟结果进行了验证,对实际生产具有指导意义。 相似文献
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基于正交试验和神经网络的激光拼焊板回弹预测 总被引:2,自引:1,他引:1
准确预测和有效控制拼焊板成形回弹,研究各因素的影响及其交互作用具有重要意义。以U形件拼焊板为研究对象,通过数值模拟、正交试验和神经网络相结合的方法,考察多个工艺参数对拼焊板回弹的交互作用,建立拼焊板回弹的BP神经网络预测模型,对U形件拼焊板的回弹进行预测和控制。结果表明,板料参数、焊缝位置、压边力、模具间隙、凹模圆角等均对拼焊板回弹有重要的影响,并存在交互作用;建立的BP神经网络模型能很好地预测U形件拼焊板在各参数影响下的回弹变化趋势,和给定一组工艺参数下的拼焊板回弹量,为拼焊板的回弹控制提供了可靠的依据。神经网络技术在拼焊板回弹预测中的应用,为拼焊板成形优化研究提出了新思路。 相似文献
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Variations in the mechanical and dimensional properties of the incoming material, lubrication and other forming process parameters are the main causes of springback variation. Variation of springback prevents the applicability of the springback prediction and compensation techniques. Hence, it leads to amplified variations and problems during assembly of the stamped components, in turn, resulting in quality issues. To predict the variation of springback and to improve the robustness of the forming process, variation simulation analysis could be adopted in the early design stage. Design of experiment (DOE) and finite element analysis (FEA) approach was used for the variation simulation and analysis of the springback for advanced high strength steel (AHSS) parts. To avoid the issues caused by the deterministic FEA simulation, random number generation was used to introduce uncertainties in DOE. This approach was, then, applied to investigate the effects of variations in material, blank holder force and friction on the springback variation for an open-channel shaped part made of dual phase (DP) steel. This approach provides a rapid and accurate understanding of the influence of the random process variations on the springback variation of the formed part using FEA techniques eliminating the need for lengthy and costly physical experiments. 相似文献
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Numerical and Experimental Investigation into Hot Forming of Ultra High Strength Steel Sheet 总被引:3,自引:0,他引:3
Hongsheng Liu Wei Liu Jun Bao Zhongwen Xing Baoyu Song Chengxi Lei 《Journal of Materials Engineering and Performance》2011,20(1):1-10
Hot forming of ultra high strength steel (UHSS) sheet metal grade 22MnB5 boron for channel components using water cooling
is studied on a laboratory scale. After hot forming, the different microstructures such as martensite, bainite, and pearlite
in formed component are produced, which are closely related with mechanical properties of formed component. The effect of
forming start temperature and the contact state between blank and die on the microstructure evolution is investigated. In
addition, the effect of processing parameters, such as forming start temperature and blank holder force (BHF), on the final
quality of component, i.e., springback, that happens after hot forming of UHSS is investigated. It can be concluded that the
forming start temperature has a significant effect on the final mechanical properties of formed components. The effect of
forming start temperature on springback is examined in detail under a wide range of operating conditions. The higher the BHF
and the forming start temperature, the lower is the springback after hot forming. Furthermore, thermo-mechanically coupled
finite element analysis model encompassing heating of sheet blank, forming and quenching are developed for hot forming process.
The stress distributions on sheet blank under different conditions during hot forming are compared to gain a fundamental understanding
of the mechanism of springback. Comparisons show that numerical simulation results have good agreement with experimental results. 相似文献