共查询到20条相似文献,搜索用时 15 毫秒
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ERW焊管辊弯成型过程的动态仿真研究 总被引:1,自引:0,他引:1
ERW焊管辊弯成型过程复杂,规律难以把握。为了获得高质量的ERW焊管,减少成型缺陷,降低开发成本,文章采用动力显式有限元法和实验获得材料模型,建立ERW焊管辊弯成型过程的弹塑性有限元模型,实现了对ERW焊管连续成型过程的全流程仿真,分析了带钢在成型过程中的应力、应变变化规律与形状变化规律以及带钢厚度对成型质量的影响。研究结果表明,整个辊弯成型过程应力变化较为平缓,在精成型段有较大变形量,产生较大应力;边部纤维纵向应变高于中部纤维,导致边部有少量"皱曲"产生;随着厚度的增加,纵向应变相应增大。 相似文献
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《Journal of Materials Processing Technology》2014,214(2):190-199
Cage roll forming is an advanced process for producing electric resistance welded (ERW) pipes. It is designed to improve the strip deformation and to increase the flexibility of production lines compared with the conventional roll forming of ERW pipes. One of the most important parameters of this process is the initial strip width. Accurate prediction of the initial strip width is vital for producing sound pipes with desired dimensional and geometrical tolerances. In this paper, cage roll forming process is simulated with the explicit elastic–plastic finite element method in the MSC Marc Mentat software. Simulation results show that by increasing the initial strip width, more circumferential length reduction is induced to the deformed strip in the fin-pass stands. This effect increases the difference of longitudinal strains at the edge and center of the deformed strip and consequently leads to a high longitudinal compression at the strip edge. Therefore, edge buckling will be unavoidable if the initial width is selected bigger than a specific limit. In order to predict the maximum initial width in cage forming process, an edge buckling criterion was introduced. The circumferential length and the horizontal distance between two deformed strip edges were obtained from the simulation and were compared with the experimental data from a production line. The comparison showed a good agreement and confirmed the finite element simulations. 相似文献
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Numerical simulation of cold roll-forming processes 总被引:3,自引:0,他引:3
3D finite element analysis is employed to simulate a cold roll-forming process. Numerical results of longitudinal strains and displacement trajectories are compared with experimental results available in the literature. Through a parametrical study, significant impacts of the yield limit and the work-hardening exponent on the product quality are observed, whereas forming speed and friction at roll-sheet interface appear to play a minor role. 相似文献
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排辊成形已经被广泛的应用于直缝钢管生产中,由于其成形过程涉及明显的非线性,为研究带钢排辊成形精成形过程,建立了排辊成形机组的大变形弹塑性有限元模型,通过显式动力算法仿真,获得了精成形段带钢的等效塑性应变分布、几何变形规律、边缘纵向应变分布,并进行了实验验证。研究表明,排辊成形精成形段的较大塑性变形发生在带钢中心和边缘;从Fp1至Fp3,PEEQ曲线大致从W状分布向U状分布过渡;边部纵向应变在0.6%以内,未导致边部成形缺陷;几何形状从类U形向顶部开口的规则圆形过渡。 相似文献
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An assessment of finite element software for application to the roll-forming process 总被引:5,自引:0,他引:5
The roll forming industry has many difficulties in product development and process set-up. The design and development of rolls and processes are mainly based on trial-and-error and past experiences. Recent industrial trends demand products having high quality and tight tolerances. This requires more precise and cost-effective roll-forming processes than the ones employed in the traditional product development methods.
SHAPE is a reliable FE based solution provider, which covers a wide range of roll forming and rotary forming simulations including ring rolling, tube spinning, flow forming, and thread rolling. It also provides powerful analysis tools for heat transfer, roll stress and microstructure analyses. In this chapter the technical capability of SHAPE for roll forming is assessed by studying an industrial problem. The accuracy and robustness of the software is evaluated using machine shop results. 相似文献
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Mehmet Okan Grtan Dragoslav Vucic Peter Groche Haydar Livatyali 《Journal of Materials Processing Technology》2009,209(17):5837-5844
Due to the new mass forming process “linear flow splitting” forming of branched profiles in integral style out of sheet metal without joining, lamination of material or heating of the semi-finished part becomes feasible. Since the resulting flanges provide extra stiffness without increasing the weight of the semi-finished product, split profiles are suitable especially for lightweight applications. The combination of the linear flow splitting process with a following roll-forming process enables the continuous production of one- or multi-chambered profiles with free flanges. In this paper phenomena occurring during roll forming of branched profiles are described and discussed. 相似文献
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板坯质量和工艺对热轧板卷冷弯性能的影响 总被引:1,自引:0,他引:1
导致热轧板卷冷弯开裂的原因很多。针对梅山热轧板厂轧机的现状和特点 ,对采用的不同钢厂的板坯进行了对比试验。得出严格控制化学成分及优化轧制和冷却工艺 ,可提高热轧板卷的冷弯性能。 相似文献
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基于有限元分析的汽车覆盖件模具设计及优化 总被引:18,自引:3,他引:15
介绍了静力隐式弹塑性有限元板料成形软件AutoForm的基本理论和关键技术。利用AutoForm软件实现了汽车覆盖件模具设计,包括模具压料面、工艺补充面以及拉延筋设计,完成了覆盖件成形过程模拟及优化,改变了传统的在有限元模拟后依靠CAD软件频繁进行模具修改的方法。在有限元软件内部实现了模具的参数化设计,既缩短了模具设计时间,又提高了模具设计可靠性。 相似文献
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基于理想形变理论,研究了金属板料成形的有限元逆算法,并开发了计算程序.采用线性三角形膜单元和厚向异性的刚塑性材料模型,计算了一个带凸缘的方盒形件,并与Dvnaform的一步逆向法和增量法的计算结果进行了比较.实例分析结果表明,在工程允许精度范围内,本文方法能够有效分析零件的成形性能.由于该方法计算速度快,所以可用于零件... 相似文献
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Hideo Kijima 《Journal of Materials Processing Technology》2013,213(10):1764-1771
Skin-pass rolling (or temper rolling) is the final forming step in the production of cold rolled steel sheets. Although a large roll radius compared to the contact length is one of the characteristics of skin-pass rolling conditions, numerous studies have been conducted thus far using laboratory mills with small radius rolls. In this paper, the influence of roll radius on the contact condition and material deformation in skin-pass rolling is examined and clarified by numerical analysis by an elastic–plastic FEM analysis as well as experimental rolling tests, which were performed to verify the result of the analysis. Some characteristics of skin-pass rolling related to pressure distribution, contact condition and material deformation are not properly simulated using small radius rolls. Considering characteristic skin-pass rolling conditions, two cases using simplified models, i.e., vertical compression and rolling with a circular, rigid roll, were analyzed. 相似文献
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对大落差前轴的精细制坯辊锻成形工艺进行研究,设计出3种精细制坯辊锻件,模拟出最优精细制坯辊锻件,然后用逆推的方法设计出第二道次和第一道次制坯辊锻件,根据辊锻件的截面和长度,使用UG软件对三道次辊锻模进行三维造型。通过Deform 3D有限元软件的模拟,对各道次辊锻件的温度场、等效应变场进行分析,结果表明各道次辊锻件成形良好。 相似文献
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J.H. Lee E.S. Park J.C. Lee M.Y. Huh H.J. Kim J.C. Bae 《Journal of Alloys and Compounds》2009,483(1-2):165
The amorphous/crystalline composite comprising amorphous particles of Cu54Ni6Zr22Ti18 embedded in the crystalline nickel matrix was produced and its temperature dependence of the plastic deformation behavior was studied in the supercooled liquid region (SLR) of the amorphous alloy. The flow stress of the amorphous alloy was quite sensitive to the testing temperature in the SLR. The deformation of the composites was dominated by the flow stress of the amorphous alloy. The deformation behavior of the composite was analyzed by finite element method (FEM) calculations. 相似文献