【作者】 孟苏飞；

【导师】 樊曙天；

【作者基本信息】 江苏大学 ， 机械电子工程， 2006， 硕士

【摘要】 卷板机在造船、锅炉、化工以及航空等行业中广泛应用。由于卷板过程中所用材料多是弹塑性材料，因此回弹就不可避免，这就导致所加工工件最终尺寸不易确定，精度难以保证。因此在卷板过程中，确定合适的工艺参数就成为滚弯加工过程的关键。传统的从大量加工经验中总结出来的方法通用性差，势必降低生产效率，增加生产成本，削弱产品在市场上的竞争力。本文的研究旨在通过对滚弯机理的研究和成形规律的总结，解决滚弯参数调整的难题，指导实际生产。同时，丰富了滚弯工艺理论，为板料滚弯成形的研究提供新的研究手段。本文从理论分析和有限元仿真两个方面对板料滚弯过程进行了深入研究。首先，基于板料弯曲理论，本文在总结现有研究的基础上，用强化型弹塑性模型材料代替理想弹塑性模型材料对滚弯形理论进行推导，揭示板料滚弯半径与中心辊下压量之间的关系，为卷板仿真提供了理论基础。并通过VB将计算过程编程，得出一个便于用户应用的界面。其次，结合理论上的分析，借助有限元软件——DEFORM-2D，以对称式三辊卷板机为研究对象，已有的试验为依据进行建模。对多次滚弯过程进行仿真，将仿真计算的结果和已有试验数据进行比较，证明了有限元法的可行性。在此基础上用有限元软件对一次成形理论计算出来的数据进行仿真，得出了比较理想的结果。接着进一步研究了滚弯过程中其它主要参数对板料成形半径的影响，分析了产生影响的原因。最后，对板料在滚弯过程中以及回弹过程中横截面上的受力情况进行了仿真分析和研究。得出了板料在滚弯变形过程中的受力情况，以及变形最大处横截面上应力的分布隋况和回弹后的板料残余应力的分布情况。更多还原

【Abstract】 Rolling machine is widely used in shipbuilding, boiler, chemical and aviation industries. Commonly the material in bending process always is elastic-plastic material, so springback can not be avoided which makes the final size and precision of the workpiece can not be ensured. Hence the key problem in the bending process is to select proper technical parameters. The traditional technical method from vast experimental data obviously reduces the productive efficiency, increases the cost and weakens competitive power. In order to solve the difficult problem of rolling adjustment and direct the manufacturing, the theory of rolls bending is studied and the laws of forming is concluded in this dissertation.Based on the theoretic and finite element simulation, the paper analyses the bending process profoundly.First, based on the analysis of plane bending theoretic and the former research achievement, the paper uses harden elastic-plastic model in place the ideal elastic-plastic model for plane bending theoretic, builds the relationship between the descent of upper roll and bending radius, offers the basic for simulation and gives an convenient interface by VB.Next, based on the theory basis and finite element software DEFORM-2D, this paper models and simulates the bending process. The results indicate that this method is feasible. And this paper simulates the one-time shaping progress, studies the influence of the structure parameter of the bending machine and the geometrical size of the plane on the bending radius and analyses the reasons.Last, this paper studies and simulates the springback in the bending process. Obtain the stress distribution of the plane in the bending process and in the most serious deformation section, and the stress distribution of the residual stress.更多还原