共查询到18条相似文献,搜索用时 62 毫秒
1.
2.
造成带钢头部翘曲的主要因素包括:板坯上下表面温度差、上下轧辊摩擦系数不等、上下轧辊辊速不等、上下辊辊径不同等。采用Marc有限元软件热力耦合分析法分析了各个影响因素对热轧带钢头部翘曲的影响规律,结果表明,翘曲量随上下表面温度差、摩擦系数比、辊速比及辊径比的增大而增大,但增大趋势各有不同。同时,提出了优化轧制规程、改善加热条件、采用适当的配辊方案、合理选择速度参数等解决带钢翘曲的措施。 相似文献
3.
根据传热学规律,分析了流换热、辐射散热、接触传热,变形热和摩擦热等主要因素对5052铝合金热粗轧温度变化的影响;得出了相应的温度模型。结果表明,温度预测误差不超过1℃,用该温度模型对轧制过程进行仿真计算可以较准确的预测实际轧制温度。 相似文献
4.
5.
通过对轧件在粗轧区内的传热分析,考虑辐射散热、除鳞水、工作辊与轧件热传导以及轧制过程中变形热,建立了在线温度模型,并采用有限差分法进行求解。将该温度模型应用于某厂1 750 mm热连轧机,应用结果表明,温度模型计算值与实测值吻合良好。 相似文献
6.
7.
8.
分析了钢板温度、轧机上下工作辊辊径差及转速差、单道次压下率、轧制线高度等因素对中厚板轧件头部弯曲的影响。同时,根据现场实际生产,从优化单道次压下率、优化咬入长度及咬入速度等方面综合考虑各种影响头部弯曲的因素,提出了轧件头部弯曲控制方法,实际生产中有效控制了中厚板头部弯曲现象,效果明显。 相似文献
9.
10.
1前言棒线厂一棒材生产线的轧钢工艺流程主要参数:粗轧机组Φ560×4/Φ475×3,中轧机组Φ410×6,精轧机组Φ350×6;终轧设计速度 相似文献
11.
12.
轧制压力横向分布规律对快速轧辊轧件一体化模型的建立、轧辊磨损及辊形预测具有重要的意义。为简洁有效地描述轧制压力横向分布,提出了轧制压力横向分布表征指标,即边中比、高次程度、一次非对称度及三次非对称度。通过有限单元法建立了轧件三维弹塑性变形模型,并根据实测数据对模型边界条件进行设置,研究了不同因素影响下的轧制压力横向分布规律。考虑到各生产因素对轧制压力横向分布的影响不完全独立,不易获得函数表达式,以多组工况下有限元仿真结果为基础,建立多生产因素影响下的轧制压力横向分布人工神经网络预测模型,为轧辊轧件一体化快速计算模型的建立奠定了基础。 相似文献
13.
14.
SHAN Xuyi 《Baosteel Technical Research》2012,6(4):3-10
Temperature evolution of a working piece during hot rolling has a significant influence on the microstructure and final mechanical properties of the material. As the measurement technologies improve,on-line measurement of the temperature across the strip width has become accessible,and thus monitoring and control of the transversal temperature distribution during hot rolling can be realized.The scanning of the temperature across the strip width can help us to understand the state of the temperature variation at the strip edges and as a result help us improve the temperature homogeneity of the strip.In this paper,reaearch on temperature distribution along the strip width is reviewed first,and then the mechanism of the scanning measuring devices is introduced.With the temperature scanning measurement data taken from the finishing mill entry point and the down coiler entry point,the temperature distribution at the strip edges is analyzed.It is pointed out that the roughing process is the main contributor to the temperature inhomogeneity.Furthermore,the contribution of the edger heater to the temperature homogeneity is investigated. 相似文献
15.
粗轧过程中出现的轧辊两侧轴承间隙差异较大的情况,会造成轧辊交叉,导致板带两侧轧制力失衡,进而引起或加剧中间坯的镰刀弯缺陷,影响最终产品质量精度和后续精轧的轧制稳定性.为研究轧辊交叉对中间坯镰刀弯生成过程的影响,建立了轧辊交叉、偏移的轧件-辊系耦合动态有限元模型,利用模型分析了不同工况条件下,轧辊交叉位置、交叉角度对中间坯楔形、弯曲量及两侧轧制力差的影响,进而总结了由轴承间隙引起的轧辊非对称交叉对中间坯镰刀弯弯曲量的影响规律.结果表明:镰刀弯弯曲量与交叉角、交叉位置比分别呈线性关系,与辊系间隙比呈二次曲线关系. 相似文献
16.
17.
The transient finite element technique is applied,and a transient heat conduction model of wet brake friction disk is established.For obtaining the accurate heat-flow density mathematic model and avoiding possibly instable thermoelastic stress produced by the non-uniform contact pressure of friction pair,a test method is applied to collect accurate contact pressure between the dual sheet steel and friction disk in the combining process.And then the heat-flow density and transient thermo-mechanical coupling simulation are analyzed.At the same time all possible boundary conditions are considered,such as the heat generation,heat conduction problem,relation between friction and contact,variation in load and heat change problem etc.The simulation results show that the mechanical model of thermo-mechanical coupling can express well the dynamic characteristics of friction disk,and gives perfect reference for more study on thermoelastic distortion of brake friction pairs. 相似文献