共查询到20条相似文献,搜索用时 328 毫秒
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针对热连轧粗轧段板坯在线调宽生产中立辊辊槽的磨损对轧制后板坯截面“狗骨”形状的影响,本文基于弹塑性有限元理论,利用有限元软件MSC.Marc,对在不同侧压量下,采用新立辊、磨损中、磨损后立辊和磨损的理想极限平立辊四种轧制条件下对应的板坯截面形状变化进行了仿真分析。得出了立辊辊槽磨损对“狗骨”形状的影响规律,随着磨损加深,立辊辊槽宽度增大,“狗骨”形状明显。 相似文献
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在热轧带钢生产过程中,粗轧立辊会不可避免地出现磨损现象。立辊磨损沿辊面非常不均匀,下线轧辊辊面呈梯形,最大磨损处磨损量可达5 mm。这严重影响了粗轧模型的设定精度,从而使带钢宽度控制精度降低。为了提高模型对立辊的设定精度,对辊面磨损范围各个位置的磨损量进行了分区计算,建立了新的粗轧立辊磨损计算模型。该模型在某1 500 mm热连轧生产线的应用表明,粗轧立辊磨损量计算值与实测值吻合较好,粗轧模型宽度预报稳定、准确。 相似文献
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孔型设计技术在过去的15年中已取得了重要进展。计算机辅助孔型设计(CARD)系统的开发推动了孔型设计向前发展,并有可能促使塑性理论的发展。本文阐述了应用工程塑性理论进行立轧理论分析的一种简单方法。这种理论被应用到孔型设计中,轧制钢轨连接件时可由几个平轧道次,一个精确控制断面形状、尺寸的预立轧孔型,和一个成品孔型代替传统的五个成形孔,因此只需在精轧道次轧辊上有孔槽。即使是对于复杂的型钢,在轧制规程中应用立轧轧制方法也可以减少开槽辊的数量。其优点是减少了轧辊的备件和换辊时间,从而提高了轧机的生产率。 相似文献
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通过对传统孔型的讨论和模拟的结果分析,基于大塑性变形原理的晶粒超微细化方法,提出了均匀大应变棒材轧制的新型孔型设计思想,建立了以多向大塑性变形加工为特点的扁椭圆系列孔型.采用非线性有限元法,建立了孔型棒材温轧过程数值分析模型,对比分析了新型孔型系列与传统孔型系列轧件断面内塑性应变分布规律,得出了在满足形状尺寸精确的条件下新型扁椭孔型能更好地将大塑性应变引入到断面中心,并使断面塑性应变趋于均匀,其中心处最大累积应变超过5.0,达到产生超微细晶粒的大塑性变形制备条件. 相似文献
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Rolling of T-shaped profiled strip by the satellite mill 总被引:1,自引:0,他引:1
H. Utsunomiya Y. Saito T. Hayashi T. Sakai 《Journal of Materials Engineering and Performance》1997,6(3):319-325
A new type of compact mill called a “satellite mill” is used for producing T-shaped profiled strip from flat strip. The mill
comprises one large-diameter flat roll (central roll) and five smaller-diameter caliber rolls (satellite rolls) arranged along
the periphery of the central roll. The flat strip is continuously passed through the five gaps between the central roll and
the satellite rolls and formed into a T shape. All rolls are driven at an equal peripheral speed to restrain elongation of
strip and to promote transversal metal flow. A guide shoe is provided between each two adjacent satellite rolls to prevent
the strip from bulging out or buckling. Using aluminum as a model material, some rolling experiments were performed on the
mill. T-shaped profiled strips with a thickness ratio (thickness of thick part per thickness of thin part) as high as three
were rolled successfully. When deformation and force characteristics were investigated, it was found that, in comparison to
a conventional multipass caliber rolling, the elongation of the strip is suppressed and the filling ability is much improved. 相似文献
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轧钢机力能参数神经网络预测 总被引:3,自引:0,他引:3
在分析轧机轧制过程中的力能参数的基础上 ,测量并计算了 50 0 mm轧机的轧制力。探讨了用神经网络模型确定轧制力的方法 ,预测了轧制力 ,并将三种方法得到的轧制力进行了比较。结果表明用神经网络模型预测的轧制力误差远小于基于传统数学模型计算的轧制力误差 ,它能较好他反映实际轧制过程的特征。 相似文献
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弯辊力设定对高速冷连轧过程的板形控制至关重要。针对某1 750 mm冷连轧机组的设备与工艺特点,计算并分析了弯辊力设定对成品带钢板形的影响规律。深入研究了带钢宽度、单位轧制力、中间辊横移量、带钢入口厚度、带钢凸度、轧辊辊径和轧辊凸度等因素对最优弯辊力的影响。通过大量统计分析和理论计算,利用Origin软件进行多元回归拟合,最终建立了冷连轧过程最优弯辊力的设定计算模型。采用新模型设定计算弯辊力的最大偏差小于3.14%,成品带钢的板形标准差平均值降至2.64 IU,新模型对成品带钢板形质量的控制有明显改善和提高。实践证明:该弯辊力模型具有较高的板形控制精度和较好的板形控制稳定性,适合于工业生产。 相似文献
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孔型轧制纤维细晶钢是日本国立物质材料研究所于2003年研制成功的高强高韧钢铁材料,在受到强大冲击载荷时,断裂路径通过多重脱层断裂方式,能做到“打断骨头连着筋”的增韧效果。系统介绍了控温大应变孔型轧制纤维细晶钢的制备流程,纤维状细小晶粒组织和纤维织构的形成机理,以及冲击过程中的裂纹扩展路径。阐明了孔型轧制过程中温度和压下量对纤维细晶钢组织和力学性能的影响规律,总结了其在冲击和拉伸过程的增韧方式,以及韧脆转变过程中所表现出的逆温度效应,这种多尺度组织和似“筷子折断”式断裂方式为金属材料的强韧化提供了理论基础和实验支撑。 相似文献
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Based on twin-roll casting, a cast-rolling force model was proposed to predict the rolling force in the bimetal solid?liquid cast-rolling bonding (SLCRB) process. The solid?liquid bonding zone was assumed to be below the kiss point (KP). The deformation resistance of the liquid zone was ignored. Then, the calculation model was derived. A 2D thermal?flow coupled simulation was established to provide a basis for the parameters in the model, and then the rolling forces of the Cu/Al clad strip at different rolling speeds were calculated. Meanwhile, through measurement experiments, the accuracy of the model was verified. The influence of the rolling speed, the substrate strip thickness, and the material on the rolling force was obtained. The results indicate that the rolling force decreases with the increase of the rolling speed and increases with the increase of the thickness and thermal conductivity of the substrate strip. The rolling force is closely related to the KP height. Therefore, the formulation of reasonable process parameters to control the KP height is of great significance to the stability of cast-rolling forming. 相似文献