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随着H型钢轧制工艺的发展,先后出现了5种常见的工艺布置形式。基于对热轧H型钢生产线的研究,创新性地提出了热轧生产H型钢的新工艺。在生产线中通过采用新型万能轧机的型式达到提高生产效率和产品精度的目的。提出的2种新型万能轧机的型式改变了自1848年在德国发明以来至今在世界各地一直沿用的万能轧机的设计,均已申报了专利。 相似文献
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介绍了在中型连轧生产线上,充分发挥万能轧机的变形特点,在国内首次采用万能孔型生产出高精度方钢的轧制工艺。 相似文献
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本文比较全面地阐述了在350mm三机架可逆万能实验轧机上开展H型钢轧制技术研究的有关工艺技术问题,如万能粗轧机、轧边机、万能精轧机的轧辊孔型设计;按欧洲万能钢梁标准轧制H80×46mm型钢的轧制规程及轧制的H型钢样品尺寸精度;轧机调整;H形轧件在万能孔型中轧制时腿部宽展的变形研究,并给出了计算腿部宽展的公式;测定并分析了在万能孔型中轧制时的力能参数。 相似文献
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针对八钢型钢产线采用两辊轧机所生产阴极扁钢无法满足电解铝厂提升的尺寸精度要求,对型钢生产工艺进行了改进,在精轧最后一道次采用万能轧机轧制,并使用DEFORM3D软件对孔型进行三维有限元分析,通过对孔型优化设计,产品精度达到了要求。 相似文献
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本文基于某厂小型电梯导轨钢生产线工艺设备的技术改造项目,将原生产线精轧部分改造为全连续轧制,并把φ550二辊型钢轧机改造为万能轧机.根据工艺要求,对轧机的机架、水平辊系和立辊辊系三个部分进行了重新设计.实践证明,改造后的生产线能够提高产品质量和产量,改造后的万能轧机能够解决电梯导轨钢等小型异形断面连轧侧边轧制的问题. 相似文献
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介绍了长钢H型钢厂利用连铸异型坯和采用万能X-H轧法开发轧制45号工字钢的过程、孔型设计和压下规程设计;并详细介绍了在孔型设计中工字钢与H型钢的不同。采用万能X-H轧法工艺,长钢H型钢厂已成功生产45号工字钢3 400余吨,产品质量情况良好。 相似文献
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几年前,型钢生产厂引入了近终形连铸工艺,轧制工字梁用梁形坯由初始原料直接铸出,使钢梁的生产更经济。紧凑钢梁生产CBP工艺彩了缩短生产线的基本原理,即用连铸机浇注断面尽可能接近最终产品形状轧制工字梁用梁形坯。开发了一种轧制方法。可以减少梁形坯的规格,并可在下流万能轧上进行更大厚度压下。原理还包括可将坯料腰高减少到进入万能轧机所需就寸的立式轧边机。将X-H轧辊孔型设计用于万能轧机中进行钢梁轧制时,这种 相似文献
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马钢大H型钢万能轧机长年连续生产,导致横轭磨损及丝杆存在损伤变形,利用年中大修时间对设备进行探伤及更换,由于此设备为进口设备,从未进行过彻底的大修,检修难度较大。详细介绍了横轭及丝杆的更换引长过程与方法。 相似文献
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通过分析国内重点企业万能轧机轧制热轧H型钢、工槽钢为主的产能介绍,详细分析国内重点钢厂万能轧机当前产品结构,同时探讨发现市场需求、引领市场消费是培育市场走向持续健康发展的保障. 相似文献
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重轨的高精度轧制技术现状 总被引:9,自引:0,他引:9
介绍了国外万能轧制技术的原理,设备配置,孔型设计及对重轨断面尺寸精度的影响;分析了传统轨梁轧机的因有问题及造成重轨几何尺寸超差的根本原因,提出了万能轧机轧制重轨是当代提高重轨轧制精度的有效方法。针对攀钢的实际情况提出了建议。 相似文献
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Flange spread is one of the most important factors in the production of H‐beams with the universal rolling mill. Although some prediction models for flange spread have been proposed, the constants in the model equations should be determined for each product size, which requires much experimental work. In this research, finite element analysis was carried out in various rolling conditions and a technique for deciding the model constants by the analysis was investigated. First, rolling experiments using pure lead were carried out to confirm the correctness of the flange spread model. Finite element analyses were then executed for rolling conditions corresponding to the experiments. The flange spread in the numerical analyses showed very good agreement with the experimental results, confirming the accuracy of the numerical simulation. At the same time, the possibility of determining the model constants by numerical analysis was demonstrated. Other related properties of universal rolling were also investigated with the data from the finite element analysis. Changes in the web and flange thicknesses after exiting the roll gap were quantitatively simulated. The cross‐flow behavior between the web and flange was investigated, and the effect of rolling conditions on the cross‐flow ratio was obtained. This research demonstrates that finite element simulation is a powerful tool for investigating and modeling deformation in H‐beam universal rolling. 相似文献
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DONG Yong-gang 《钢铁研究学报(英文版)》2010,17(1):27-32
In rail rolling by universal mill, a simplified 3-dimention theoretical model has been built firstly. The kinematically admissible velocity field of the web, head and base of rail have been determined respectively, moreover the corresponding strain rate field and the strength of shear strain rate have been also obtained. Then the plastic deformation power of corresponding deformation zone, the powers consumed on the velocity discontinuity surface and the powers generated for backward slip and forward slip have been proposed. According to the upper-bound method, the roll force of horizontal roll and two vertical rolls can be obtained. Moreover, The process of 18kg/m light rail and 60kg/m heavy rail universal rolling have been simulated by rigid-plastic FEM(finite element method) for verifying the theoretical model. And the universal rolling experiments of 18kg/m light rail has been accomplished in Yanshan University Rolling Laboratory. Compared the results of numerical simulation and the experimental data, the roll force from upper-bound method is somewhat greater than experimental data but in general do not exceed them by 20 percent. So, it is reliable and feasible to preset and optimize the parameter of rolling technology according to the upper-bound method. 相似文献