大尺度曲面板材零件渐进双曲折弯成形的数值模拟
发布时间：2018-09-19 19:54
【摘要】：本文探讨了大尺度曲面板材成形的一种新的渐进折弯的整体冷成形加工方法。相对于传统的水火弯板成形,提高了生产效率,并且可以改善工人的工作环境,提高工艺的合理性与经济性。首先通过拉伸实验测定高强度金属板WELDOX900的弹塑性材料力学参数并导入到有限元分析软件之中。利用ABAQUS里固有的本构模型和单元,构建大幅面钢板渐进双曲折弯成形的三维弹塑性有限元模型。通过有限元数值模拟对比渐进折弯中的关键因素,包括凹凸模半径、凹模开口、凸模进给量对折弯以及回弹的影响,在此基础上优化了凸凹模渐进折弯大尺度曲面板材的成形工艺参数。本文通过理论推导和有限元模拟分析,确定了凸凹模半径及工件成形的几何规划。并通过有限元模拟取得了较好的成形效果,最后通过实验验证了模拟以及工艺规划的有效性及可行性。对于模拟中碰到的起皱缺陷问题,进行了理论上的分析探讨和模拟研究,并且通过改变关键工艺参数消除了起皱的缺陷,对于加工过程具有实际指导意义。通过有限元模拟大尺度等曲率鞍形面和帆形面板料成形的折弯过程,得出的折弯规律,有助于今后进一步研究复杂曲面的成形过程。
[Abstract]:In this paper, a new cold forming method of progressive bending for large scale curved sheet metal forming is discussed. Compared with the traditional water and fire bending plate forming, the production efficiency is improved, and the working environment of workers is improved, and the rationality and economy of the process are improved. The elastoplastic material mechanical parameters of high strength metal plate WELDOX900 were measured by tensile test and introduced into the finite element analysis software. Based on the inherent constitutive model and element in ABAQUS, a three-dimensional elastic-plastic finite element model for the progressive hyperbolic bending of large-format steel plate is constructed. Through the finite element numerical simulation, the key factors in progressive bending are compared, including the radius of the die, the opening of the die, the effect of the feed of the die on the bending and the springback. On this basis, the forming process parameters of progressive bending of large scale curved sheet with convex and concave die are optimized. In this paper, the radius of convex and concave die and the geometric programming of workpiece forming are determined by theoretical derivation and finite element simulation analysis. Good forming effect is obtained by finite element simulation. Finally, the effectiveness and feasibility of simulation and process planning are verified by experiments. The wrinkling defects encountered in the simulation are analyzed and simulated theoretically, and the wrinkling defects are eliminated by changing the key process parameters, which is of practical significance for the machining process. The bending process of large scale equal-curvature saddle surface and sails is simulated by finite element method, and the bending law is obtained, which is helpful to further study the forming process of complex surface in the future.
【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306
本文编号：2251163
[Abstract]:In this paper, a new cold forming method of progressive bending for large scale curved sheet metal forming is discussed. Compared with the traditional water and fire bending plate forming, the production efficiency is improved, and the working environment of workers is improved, and the rationality and economy of the process are improved. The elastoplastic material mechanical parameters of high strength metal plate WELDOX900 were measured by tensile test and introduced into the finite element analysis software. Based on the inherent constitutive model and element in ABAQUS, a three-dimensional elastic-plastic finite element model for the progressive hyperbolic bending of large-format steel plate is constructed. Through the finite element numerical simulation, the key factors in progressive bending are compared, including the radius of the die, the opening of the die, the effect of the feed of the die on the bending and the springback. On this basis, the forming process parameters of progressive bending of large scale curved sheet with convex and concave die are optimized. In this paper, the radius of convex and concave die and the geometric programming of workpiece forming are determined by theoretical derivation and finite element simulation analysis. Good forming effect is obtained by finite element simulation. Finally, the effectiveness and feasibility of simulation and process planning are verified by experiments. The wrinkling defects encountered in the simulation are analyzed and simulated theoretically, and the wrinkling defects are eliminated by changing the key process parameters, which is of practical significance for the machining process. The bending process of large scale equal-curvature saddle surface and sails is simulated by finite element method, and the bending law is obtained, which is helpful to further study the forming process of complex surface in the future.
【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306
【参考文献】
相关期刊论文 前2条
1 董大栓,柳存根,谭家华;水火弯板计算中高斯分布热源模型各参数的实验确定[J];上海交通大学学报;2001年10期
2 纪卓尚,刘玉君,孙振烈,金世良;船体曲面钢板水火加工成型工艺的理论与应用研究[J];中国造船;1998年S1期
相关硕士学位论文 前2条
1 周明博;宽板U形弯曲理论及实验研究[D];燕山大学;2007年
2 宫海兰;变径薄壁零件粘性介质外压多道次缩径研究[D];哈尔滨工业大学;2008年
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