共查询到20条相似文献,搜索用时 0 毫秒
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The purpose of this study is to develop a three-dimensional coupled thermo-elastic-plastic finite element model of nonisothermal
rolling and analyze the strip curvature caused by the difference in the heat transfer boundary conditions of the upper and
lower rollers. The difference in the rotation speed between the upper and lower rollers was utilized in an attempt to correct
the aforementioned curvature in hot rolling due to unsymmetrical cooling conditions. In addition, the changes in shape, temperature
field, and strain field of the strip during the various stages were analyzed and can be used to obtain the lateral plastic
flow of the strip. As for the aspect of heat transfer, the various possible boundary conditions in the actual hot rolling
were considered, which include the convection boiling of the air and water, and the radiation loss. Then, the three-dimensional
finite difference heat transfer equation is derived according to the concept of heat balance. As for the determination of
the direction of tangential friction force, this study also developed a modification algorithm to adjust to the three-dimensional
rolling process. After a comparison with the experimental data in Ref 8 and 15, and the simulated temperature distribution
in Ref 17, the partial results obtained from the computation by the numerical analytical model verify that the theoretical
model and computer programs established in this study are reasonable. This study shows that hot rolling can greatly reduce
the rolling force and strain rate with the early appearance of plastic deformation, and the distribution of temperature field
is basically affected by the heat transfer boundary conditions. However, unsymmetrical heat transfer boundary conditions will
cause unsymmetrical rolling forces of the upper and lower rollers and cause strip curvature; this condition can be corrected
by the difference in the rotation speed of the rollers. 相似文献
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大型楔横轧机轧制力和轧制力矩有限元算法 总被引:3,自引:1,他引:3
精确确定大型楔横轧机的轧制力和轧制力矩是研究大型楔横轧机的重要基础课题,通过理论计算和有限元法模拟,计算了H1400大型楔横轧机的轧制力和轧制力矩,误差均在10%以内,为研制H1400大型楔横轧机提供了有效的数值工具。 相似文献
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带钢热连轧过程轧制力三维有限元模拟 总被引:1,自引:0,他引:1
在现代计算机控制的带钢生产中,轧制力的设定极其重要.根据宝钢轧制力模型和现场实测数据,结合热连轧过程中带钢三维变形和热力耦合的特点,应用DEFORM-3D软件建立了带钢热连轧前两个道次的有限元模型,模拟了热连轧过程中两个道次的轧制力变化,并与宝钢模型计算值和实测值进行了对比.结果表明,有限元法计算的轧制力与现场实测数据接近,两者误差在5.0%以内,同时有限元法的计算精度高于宝钢轧制力模型,特别是在第一道次,轧制力计算精度高出4.0%,该模拟为现场轧制工艺参数的调整优化提供了重要的参考价值. 相似文献
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Xiong Shangwu Zheng Guifang Liu Xianghua Wang Guodong 《Journal of Materials Processing Technology》2002,120(1-3)
The vertical–horizontal rolling process is often used to accomplish width reduction so as to provide a synchronising operation between the continuous slab casting and hot rolling processes. Numerical simulation of the non-steady state deformation behaviour around the head and tail ends during this process is made by the full three-dimensional rigid–plastic finite element method. An explanation is provided in the theory for the ‘thin element technique’ at the inlet surface of velocity discontinuity. To deal with the interpolation of friction within a surface of an element contacting partly with the roll, a new term, so-called ‘pseudo shape function’, is presented and a related new equation formula is deduced. The calculated shape of the slab edge, the separating force and the rolling torque are consistent with those measured experimental ones for the model material lead. 相似文献
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有限元模拟技术在板带钢轧制中的应用 总被引:8,自引:1,他引:8
介绍了板带钢轧制过程中常用的有限元模拟方法的类型,及其近年来在揭示轧制力能参数、温度场、板形控制及板带轧制新技术和新工艺开发中的一些应用实例,并指出其存在的问题和发展前景。 相似文献
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Analysis of non-steady state slab edging in roughing trains by a three-dimensional rigid-plastic finite element method 总被引:1,自引:0,他引:1
Shangwu Xiong Xianghua Liu Guodong Wang 《International Journal of Machine Tools and Manufacture》2000,40(11):1573-1585
Numerical simulation of the non-steady state deformation behavior around the head and tail ends during slab edging is carried out by the full three-dimensional rigid-plastic finite element method. The calculated shape of the slab edged, separating force and rolling torque are shown to be in good agreement with the experimental results found in the literature and the calculation precision is improved to a certain extent compared with previous works. 相似文献
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双金属复合带材轧制过程有限元模拟 总被引:12,自引:1,他引:12
采用刚塑性有限元法,以实验结果为依据,以大型有限元软件ANSYS为分析工具,对双金属复合带材轧制过程进行计算机数值模拟,分析了双金属复合带材同步或异步轧制过程中,轧辊和轧件的应力,应变分布和轧件的塑性流动变形情况以及轧制力和力矩,以动画的方式模拟轧制过程,给出了一种预测轧制结构,减少实验时间和费用的有效方法。 相似文献
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Youngsoo Yea Youngsoo Ko Naksoo Kim Jongchan Lee 《Journal of Materials Processing Technology》2003,140(1-3):478-486
The ring rolling process involves 3D non-steady flow and continuous change of radius and thickness of the ring workpiece. In this study, a commercial FEM-code that is especially tailored to ring rolling process, SHAPE-RR™, is used to predict spread, pressure distribution and roll force in plain and T-shaped ring rolling processes. Two cases of plain and T-shaped rings are, respectively, simulated for the prediction of side spread by changing feed-rate and groove factor. Plain ring rolling is simulated for the prediction of pressure distribution and roll force. Compared with earlier experimental works, the results of simulations show good quantitative agreements. It is concluded that the solution tool can be utilized in design and analysis of ring products, process, and tooling and equipment. 相似文献
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In order to continuously analyze the whole fine-blanking process.from the geginning of the operation up to the total rupture of the sheet-metal,without computational divergence, a 3-D rigid visco-plastic finite-element method based on Gurson void model was developed.The void volume fraction was introduced into the finite element method to document the ductile fracture of the sheet-metal.A formulation of variation of the rigid visco-plastic material was presented according to the virtual work theory in which both the effects of equivalent stress and hydrostatic pressure in the deformation process were considered.The crack initiation of the sheet was predicted and the crack propagation was geometrically fulfilled in the simulation by separating the nodes according to the stress state.Furthermore.the influences of different state-variables on the deformation process were also studied. 相似文献
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Z. Y. Jiang A. K. Tieu 《International Journal of Machine Tools and Manufacture》2000,40(15):2139-2154
A main feature of the rolling of ribbed strip is local residual deformation, which affects the pulling down of rib height when the ribbed strip is rolled. Using a 3-D “slightly-compressible” rigid visco–plastic finite element method, the hot rolling of ribbed strip is analyzed in this paper. The results show that the distribution of rib height along the width of strip is not uniform, and the pulling down of rib height increases when the reduction and thickness of base strip increase. The variation of rib height is smaller with a higher rolling temperature. If the friction factor in the backward zone increases, the rib height and forward slip increase. Friction variation is found to affect the convergence of simulation. Results of simulation from the rolling of ribbed strip and experimental values have been found to be in good agreement. 相似文献
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应用有限元法对不同空心率铅锭方坯的轧制过程进行了模拟计算,得出了不同空心率对铅锭的变形及应力的影响,计算结果与试验结果相符。由于铅在室温下的变形状态与高温时钢的变形状态有很多相似之处,本文的研究结果对研究钢的带液芯轧制有一定的指导意义。 相似文献