共查询到19条相似文献,搜索用时 633 毫秒
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斜轧变形区的解析分析 总被引:1,自引:2,他引:1
通过斜轧辊形与变形区关系的数学模型,剖析了变形区特征和调整参数对变形的影响以及辊形的构成特点等,提供了一种分析钢管斜轧变形,辊形设计与修改的实用方法。 相似文献
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在斜轧方法中,轧辊辊形与轧件的几何关系对于辊形设计及金属塑性流动的研究具有重要的作用。本文建立了斜轧辊形与由辊形所构成的轧制空间的关系的数学模型,利用该数学模型,可进行斜轧穿孔机、延伸机、斜辊式管、棒材矫直机以及行星轧管机的理论辊形曲线的设计和有关金属变形的研究。本文给出了行星轧管辊形设计的具体算例。 相似文献
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为进一步分析轧辊弹性变形对板形的影响,介绍了轧辊弹性变形影响函数解析方法,采用C语言编写了轧辊弹性变形解析软件,对四辊CVC冷轧机轧辊的弹性变形进行了模拟计算,结果表明,工作辊与支撑辊的挠曲均呈不对称的“V”形分布,辊间压扁量与辊间压力均呈“S”形分布.整个调控范围内支撑辊挠曲和工作辊与轧件间的压扁量变化较小,工作辊挠... 相似文献
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利用热力耦合有限元方法,对薄带连铸结晶辊的温度场和热变形进行研究,给出了浇注温度、浇注速度和冷却水流量对结晶辊温度场和热变形的影响规律,并利用有限元方法设计了初始辊形,有效地改善了铸带厚度的均匀性. 相似文献
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前文(见本刊1986年第4期——编注)已经利用密栅云纹法分析了杯形件冷挤时的变形状态,得到了杯形件冷挤时金属的真实流动模式、变形区外形和位移速度场,并由位移速度曲线作出了应变速度场。本文进一步研究精确处理位移速度场数据的方法,然后利用塑性理论由所得的应变速度场求变形区内各点的应力分布。一、位移速度场数据的处理及应变速度场的确定 相似文献
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建立热辗环三维有限元模型。通过三维有限元模拟辗环轧制过程,得到了轧制过程中的变形区速度场分布以及金属流动规律;得出了芯辊进给速度和驱动辊角速度对于轧制速度的影响规律。对于合理制定辗环轧制工艺,改善辗环加工精度具有指导意义。 相似文献
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简要分析了斜轧延伸轧管技术的发展状况。通过对AccuRoll轧管机变形区中金属变形的理论分析和试验研究,探讨了轧制工艺特征和工具对轧制变形的影响。在将计算机技术应用于变形区模拟分析和钢管主变形分析后,提出了斜轧延伸孔型设计的基本原则。试验研究表明,通过AccuRoll轧管机的孔型设计,可实现减径、等径和扩径3种轧制形式。通过优化孔型设计,用AccuRoll轧管机轧制薄壁管,其D/S值已达到41。该工艺技术的发展将进一步提高轧制薄壁管的稳定性和轧制速度。 相似文献
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钢管斜轧延伸的金属变形研究及孔型设计(下) 总被引:1,自引:1,他引:0
简要分析了斜轧延伸轧管技术的发展。通过对AccuRoll轧管机变形区中金属变形的理论分析和试验研究,探讨了轧制工艺特征和工具对轧制变形的影响。并将计算机技术应用于变形区模拟分析和钢管主变形分析,提出了斜轧延伸孔型设计的基本原则。试验研究表明,通过AccuRoll轧管机的孔型设计,可实现减径、等径和扩径3种轧制形式。通过优化孔型设计,用AccuRoll轧管机轧制薄壁管,其D/S值已达到41。该工艺技术的发展将进一步提高轧制薄壁管的稳定性和轧制速度。 相似文献
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根据三辊轧管变形的特点,分析了三辊轧管辊形在变形区各段对荒管内扩径值的影响,并进行了实验论证,提出了轧辊台肩和辗轧带母线与出口锥母线的夹角是影响轧后荒管内扩径值的主要因素。 相似文献
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根据二辊斜轧变形区的几何关系,提出了适用于只存在送进角,或既存在送进角又存在辗轧角的二辊斜轧辊型设计通用数学模型。分析了有关参数对辊型曲线的影响。 相似文献
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An experimental investigation on the deformation behavior during wire flat rolling process 总被引:5,自引:0,他引:5
In the present study a laboratory flat rolling machine is utilized to assess the deformation behavior of low and high carbon steel wires in wire flat rolling process. The effects of friction coefficient, rolling reduction and roll speed on rolling force and deformation behavior of the wires are experimentally investigated. It is found that the roll speed affects considerably the rolling force but a negligible effect on deformation behavior. It is noted that by increasing the roll speed, the rolling force may decrease or increase depending on the magnitude of the roll speed. Also, the deformation behavior of the wires in flat rolling is formulated. A relationship is developed for calculating the width of contact area between the wire and rolls as a function of rolling reduction. This relationship depicts that the width of contact area is proportional to square root of rolling reduction. Furthermore, two relationships are derived to predict the spreading of the wires after flat rolling. It is found that the relationships are applicable for both the low and high carbon steel wires. 相似文献
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辊间接触对高速冷连轧过程有重要影响。针对1 750 mm冷连轧机组的设备与带钢轧制的工艺特点,通过对UCM轧机辊系的受力分析,采用离散化处理方法和影响函数法,建立了辊系弹性变形影响函数模型、轧辊压扁影响函数模型,并给出了辊系变形的基本物理方程,基于接触力学,最终提出了冷连轧过程中工作辊辊间接触判定准则,为精确计算工作辊间的压力分布提供了理论依据。同时,研究了工作辊辊间接触对单位宽度轧制力分布、工作辊与中间辊辊间单位压力分布、工作辊弯曲挠度和压扁量分布以及成品带钢横向厚度分布的影响。实践证明,建立的辊间接触和辊系变形计算模型具有较高的计算精度,能充分反映轧后带钢的横向厚度分布和板形分布规律,适合于工业生产实践。 相似文献
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Hai-liang Yu Qing-bo Yu Jin-wu Kang Xiang-hua Liu 《Journal of Materials Engineering and Performance》2012,21(9):1841-1848
Magnesium alloy strips are widely used in aerospace, automotive industry, etc., which are difficult to produce through cold forming process due to their poor deformation ability. In this article, we studied whether the rolling process with heated roll could be used to roll cold magnesium alloy strips. Thermal-mechanical finite element simulation of the rolling process, using heated roll and cold strips to produce the magnesium alloy strips, was carried out. Influences of roll temperature, rolling velocity, rolling reduction ratio, and initial strip thickness on the thermal field and the mean temperature of magnesium alloy strips were analyzed. Both the heated area in strips in rolling deformation zone and the mean temperature of strips at exit of rolling deformation zone increase with increasing the roll temperature and/or rolling reduction ratio, and/or with decreasing the rolling velocity and/or initial strip thickness. Finally, a formula was developed to predict the mean temperature of strips under different rolling conditions, which also could be used to calculate the critical value of parameters in rolling process. 相似文献
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H. Pishbin M. H. Parsa A. Dastvareh 《Journal of Materials Engineering and Performance》2010,19(7):936-941
In this paper, clad sheet bonding by cold rolling was investigated using the upper bond theorem. Plastic deformation behavior
of the strip at the roll gap was investigated, unlike previous methods; distinctive angular velocities are used for different
zones in roll gap in present model and absolute minimum of rolling power function is achieved. Rolling power, rolling force,
and thickness ratio of the rolled product affected by various rolling condition such as flow stress of sheets, initial thickness
ratio, roller radius, total thickness reduction, coefficient of friction between rollers and metals and between components
layer, roll speed, etc., are discussed. It was found that the theoretical prediction of the thickness ratio of the rolled
product, rolling force, and rolling power are in good agreement with the experimental measurement. 相似文献