共查询到18条相似文献,搜索用时 296 毫秒
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大直径薄壁弯管回弹的有限元模拟 总被引:1,自引:1,他引:0
以大直径薄壁导管数控弯曲为研究对象,依据实际过程建立了成形以及回弹过程描述方法.在此基础上,应用ANSYS有限元软件,完成了大直径薄壁钛管加热弯曲回弹有限元建模,基于静力隐式算法,实现了大直径薄壁管件热弯成形过程以及回弹的有限元模拟,通过回弹的数值模拟结果与试验的对比分析,验证了本文所建立的模拟方法的有效性. 相似文献
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钢管连轧过程有限元分析软件的开发 总被引:6,自引:0,他引:6
介绍了钢管连轧过程的有限元分析方法及其在实际中的应用。利用三维动态显性算法,可以精确地分析和模拟金属变形过程,有效地优化工艺设计。在有限元编程过程中,采用一些合理的假设及一系列最新的算法,使有限元分析程序能够在微机上运行。 相似文献
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轿车侧挡玻璃弯曲回弹的有限元仿真 总被引:1,自引:0,他引:1
介绍了轿车侧挡玻璃落模弯曲成形中回弹的机理,建立了有限元模型。利用显式动力算法和隐式静力算法分别对轿车玻璃的落模弯曲和回弹变形进行了数值模拟,采用细分网格保证模拟精度,研究了模具环弯曲半径、玻璃落模高度和加热温度等工艺参数对弯曲回弹的影响,为实际生产提供参考依据。 相似文献
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结合显式动力学有限元方法、几何模型更新方法、隐式静力有限元方法对立-平辊轧制过程三道次三维热、力场进行了分析。通过模拟计算的结果,分析了各道次轧件在轧制过程中的温度变化及其原因,并给出了轧件等效应变的分布、各方向应力场的分布。研究结果可以用来分析轧制过程中轧件缺陷变形行为,同时为研究多道次轧制过程和复杂断面轧件轧后冷却过程变形行为提供了新的方法。 相似文献
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率相关晶体塑性在有限元应用中存在数值求解稳定性、精度和效率不能兼顾的问题,这是由于其数值化过程中的诸多关键技术相互的制约所致。文章讨论了这些关键技术,指出了建模采用的变形构形和控制方程的主未知量对求解计算的影响,研究了本构计算的隐式和显式算法及数值技巧,并分析了有限元计算过程对本构求解的影响。基于对这些关键技术的研究及对其处理方法的探讨,简要给出了率相关晶体塑性隐式和显式模型及求解算法示例。圆棒料镦粗和杯形件拉深过程模拟研究表明,这些模型和算法能够较好地兼顾计算的稳定性、精度和效率,而且其结果也表明,文章对这些关键技术问题的处理是合理可行的。 相似文献
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Dynamic explicit FE modeling of hot ring rolling process 总被引:10,自引:1,他引:10
1Introduction Ring rolling is an advanced process typically used to manufacture parts with revolved geometries.It makes use of rotating rolls to press a ring continuously and locally,causing the wall thickness of the ring to reduce,the diameter to expand … 相似文献
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《Journal of Materials Processing Technology》2014,214(6):1245-1258
During the conventional ring rolling process, the ring mainly produces the incremental deformation of wall-thickness reduction and diameter expansion, which makes it difficult to manufacture the cylindrical ring with small diameter and large height. In this paper, a new method for manufacturing the cylindrical ring using a ring blank with smaller height, i.e. cylindrical ring rolling, is proposed and its feasibility is verified. For evaluating the cylindrical ring rolling process and to better understanding its deformation characteristics, a 3D elastic–plastic FE model of cylindrical ring rolling is first established. Then, the comparison between conventional ring rolling and cylindrical ring rolling is investigated using this 3D FE model. Finally, the effects of the process parameters, such as the feed rate of the idle roll, diameter of the idle roll and friction coefficient between the rolls and ring, on cylindrical ring rolling are numerically revealed. The experiment is carried out on a vertical NC ring rolling machine and the good agreements between the experimental and simulation results verify the validity of the established 3D FE model of the cylindrical ring rolling. 相似文献
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板材多工步成形中切边工序的数值模拟技术研究 总被引:3,自引:0,他引:3
切边在板材多工步成形中一般是获得成品的最后一个工序。成形过程中 ,由不均匀塑性变形产生的残余应力在切边时的释放 ,会造成零件应力应变场的重新分布 ,因此本文建立了简化的线弹性切边卸载模型 ,基于静态隐式算法 ,在复杂蒙皮拉形数值模拟系统STRETCHFORM基础之上 ,开发了板材多工步成形中切边工序的计算模块 ,用以计算零件在切边后应力应变场的变化情况。本文还详细研究了切边求交、单元的取舍判断、畸变判断和局部调整、新旧单元系统的变形场信息传递等算法 相似文献
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滚压有限元模型数值模拟 总被引:1,自引:0,他引:1
滚压数值模拟是制定滚压工艺、预测滚压后工件表面残余应力分布,以及判定工件疲劳性能的重要工具。目前的滚压数值模拟主要集中在对曲轴以及回转体的分析,少有的对平面滚压数值模拟中,大多数也只分析了单圈或不到一圈的滚压过程,而且与实际滚压工艺存在较大的区别。为弥补以上不足,该文采用有限元商业软件ABAQUS提供的Explicit模块,并结合python编程语言,开发了更接近于实际的滚压模拟过程;采用该模型研究了滚压力的大小、滚针直径、表面摩擦系数等对于残余应力分布规律的影响,并通过H13钢的滚压实验,对模型模拟结果进行了验证。 相似文献
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采用二维交替差分法建立了铝热连轧轧件温度计算模型,同时采用粒子群算法对模型参数进行了优化。经验证,优化后模型的计算精度在10℃以内;利用建立的温度模型研究了铝板带在热轧生产过程中的温度场变化规律,并分析了工艺参数对轧件终轧温度场的影响。研究结果表明,粗轧区轧件温度分布主要由接触导热与轧件内部的热生成两者共同决定,而精轧区还要受到乳液喷淋的影响;轧制速度越大,轧件终轧温度越高,横向温差越大;处于相同机架间的冷却集管的冷却能力几乎相同,而处于不同机架间的冷却集管,随着机架数的增加,冷却能力增强,横向温差随着开启度的增大而减小;轧件宽度对轧件终轧温度的影响很小,而横向温差随轧件宽度的增大而增大;随着乳化液温度的升高,轧件终轧温度升高,而乳化液温度对轧件横向温差没有影响。 相似文献
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Three-dimensional FE model of plastic penetration in L-section profile cold ring rolling is established under ABAQUS software. Based on this model, the expanding rules of plastic zone in roll gap are revealed by FE simulation, and three deformation behaviors of L-section ring that exist in the rolling process are exposited. Conditions for three deformation behaviors are studied and verified by rolling simulation and experiment. The deformation behavior, which is needed for normal rolling of L-section ring, and its conditions are determined at last. 相似文献
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Ring gripping means that under the pressure of roll and friction, ring grips the rolling gap and produces rotating rolling motion, thus ring thickness receives equal rolling and the outer diameter expands equally, and this is a sufficient condition for ring rolling forming. In this paper, gripping course in profile ring rolling of raceway groove is analyzed based on ring rolling principle and static theory. The gripping mechanical model for profile ring rolling of raceway groove is established, and gripping conditions are researched according to the geometrical relationship in rolling. The results indicate that ring could be ensured to continuously grip the gap in rolling by controlling feed per revolution and preventing it from exceeding the maximum feed per revolution allowed by ring gripping. Furthermore, influencing factors of gripping conditions are analyzed. At last, the experiments and the FE simulation for profile ring rolling of raceway groove are performed to testify the validity of gripping conditions. Both the experimental and simulation results show that when feed satisfies gripping conditions, ring can continuously grip the gap and be formed by rolling. Otherwise, ring cannot grip the gap and is squashed between the rolls. The results of this research provide a theoretical basis for design of technological parameters of profile ring rolling of raceway groove. 相似文献
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几种典型件成形过程的弹塑性有限元数值模拟 总被引:5,自引:0,他引:5
本文用独立开发的板料成形静力隐式弹塑性有限元数值模拟软件SHEETFORM-Ⅰ对几种典型件的成形过程进行了数值模拟, 得到了和实际情况较为一致的结果, 证明所开发的软件是可靠的。 相似文献