【作者】 郑军兴；

【导师】 张曙红；

【作者基本信息】 昆明理工大学 ， 工程力学， 2006， 硕士

【摘要】 随着我国经济的迅速发展，人们生活水平的不断提高，在生产和生活中人们将更多的应用外形美观、经济实用、安装方便的冷弯型钢产品，冷弯型钢作为高效经济型材的应用也越来越广泛。然而冷弯成型是一种复杂的板带深加工方法，金属板材在成型过程中存在着几何、材料和边界接触等多重非线性问题，而且影响成型过程的因素很多。因此，冷弯成型技术研究是一个复杂的课题。而我国冷弯成形理论研究的进展比较缓慢，辊式成型金属变形行为的研究尚不完善，生产中的工艺设计和孔型设计主要依靠设计者的经验知识，还不能很好的解决生产和设计中遇到的问题。本文首先介绍了冷弯型钢的特点及应用，总结了国内外关于辊式冷弯成型理论研究的现状及发展趋势。并对冷弯成型基本理论和国内、外冷弯型钢CAD／CAE技术的发展现状作了详尽的叙述。接着对分析冷弯成型变形机理时所需要涉及到的材料、几何及接触三大非线性问题和冷弯型钢孔型设计的基本理论(料宽、弯曲角及回弹角等)进行了简述和归纳，阐述了本文立题的背景和意义。考虑到实际冷弯成型过程本身是一个动力学过程，本文采用三维大变形有限元方法，根据实际生产的真实条件建立力学模型，用大型有限元软件ANSYS／LS-DYNA对C型板辊弯成型过程的三维变形过程进行了数值模拟。并系统的分析了成型过程中板料圆角和翼缘部位应力、应变的变化规律。此外，本文还研究了几种成型参数对成型过程的影响，得出了板料厚度、轧辊间距、成型角等因素对板料成型后应力、应变的影响规律。揭示板料成型规律，实现了研究方法的创新，具有一定的理论意义和实际价值。此外，作者还利用ANSYS静态计算模块分析了C型钢的卸载反弹。探讨了材料的力学性质、硬化模型、板料厚度、轧辊间距及成型角等因素对辊弯成型回弹量的影响规律，得出了一些对实际生产有用的结论。最后将回弹模拟结果与实际生产中的回弹结果进行比较，验证模拟结果的可靠性，真正地使模拟结果能够用于指导实际生产。本论文的研究将对于冷弯型钢产品的开发、模具设计及回弹量的计算和控制都有很好的参考作用。更多还原

【Abstract】 With the quick development of economy and the raise continuously of people’s live level, more and more shape beauty、 economy practical、 install convenient cold-roll steel product will be applied in our country.As the application of the material of the efficiently economic is also more and more extensive. However, cold-roll forming is a complicated sheet and strip steel manufacturing method, the steel sheet own the characteristic of geometric nonlinearity, material nonlinearity and contact boundary nonlinearity on cold roll forming process.Moreover, a lot of factors affect its forming proves. So, cold roll forming technology is a complicated topic. It is relatively poorly understood in our country, and the roll design mainly depends on designer’s experience, many problems in the design can’t also be good to resolve.First of all, this paper introduces domestic and international relevant forming craft technique、 forming theory、 numerical simulation of roll forming process. Combine to the mechanics basic theories and the domestic and international CAD/CAE development condition of cold-roll forming to make detailed description, And elaborated to the theories (geometric nonlinearity、 material nonlinearity and contact boundary nonlinearity) and mechanics foundation (Material width, model angle and spring-back etc) of cold-roll forming . Elaborated to the background and the meaning of this text.Considering the actual forming process is a dynamics process, adopted the 3D elastic-plastic finite element method and based on true producing condition, the variety rules of forming stress and strain are analyzed by the numbers. Other important parameters are received by simulation and the reality simulation for C producing process is realized. This paper has also analyzed the roll forming process of the different thickness metal sheet ,and carried on systematic research of all kings of different forming parameters influencing on forming process. Get the factor of material thickness、 roller’s distance and model angle to the stress and strain’s influence regulation . This paper carry on theoretical and experimental research on roll forming process systematically.Used the dynamic calculation result of ANSYS as the initial stress condition, the unloading values of the finished products are obtained by implicit calculating block . Considering the factor of the mechanics property of the material 、 the hardening model、 thematerial thickness、 roller’s distance and model angle to the influence with accuracy of the spring-back value, Combine with the spring-back value in produce， to verify credibility of the imitate result, make to imitate result be used for guiding actual production really . Moreover, The research results of this thesis have a good reference function for exploiting of new roll-forming products 、 roller mould design and the calculation and controls of spring-back.更多还原