共查询到19条相似文献,搜索用时 109 毫秒
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上海宝山钢铁总厂球墨铸铁轧辊课题组 《宝钢技术》1985,(3)
一.前言张力减径机组是宝钢钢管厂主要机组之一,其轧辊在工作时将受到切向拉伸与径向压缩的复合应力,而在轧辊孔型表面与钢管之间则产生相对的滚动与滑动摩擦;又因轧辊与灼热(温度980—600℃)的钢管管坯接触,使孔型表面温度升高,但与钢管脱离接触后即在连续喷水下冷却,从而使该表面还承受冷热交变应力的作用。由以上可知,张减辊工作条件比较复杂,要满足使用要求需具有足够强度与韧性,并有良好耐磨性与抗冷热疲劳性能。 相似文献
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张力减径机不同孔型横向壁厚分布的有限元模拟分析 总被引:7,自引:0,他引:7
借助有限元分析软件模拟钢管张力减径的轧制过程,由3种不同张力减径机孔型轧制的同一规格钢管产品的横向壁厚分布的比较表明,采用宝钢专有技术设计的新孔型轧制的钢管与原有的德国传统孔型轧制的钢管相比,其横向壁厚较为均匀,并对钢管"辊印"缺馅的产生有抑制作用. 相似文献
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1 概述KOCKS棒材减定径机组 (RSB)和 KOCKS钢管精密定径机 (PSM)及张力减径机组 (SRB)以三个输入传动轴、轧辊径向可调或不可调整为特点的机架代表了三辊技术的“领先技术状态”。精密定径机 (PSM)可装配 3个径向可调节的三辊机架并且可用来给现有的张力减径机升级换代。已经安装在现有设备后面的精密定径机 (PSM)可在生产成本及钢管质量方面取得巨大的效益。完全克服并摆脱了传统张力减径机所受的限制 ,具体体现在以下几个方面 :1 )可获得更高的轧制力和扭矩 ;2 )实现了更小的机架间距 ;3 )可快速换辊 (3 0分钟 /机架 ) ;4)轧辊… 相似文献
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热等静压法制造复合轧辊的研究 总被引:3,自引:0,他引:3
首次尝试用了热等静压法制造大型钢管张力减径机复合硬持合金轧辊,并获得了近实物尺寸的复合轧辊。通过对复合轧辊解剖取样,考察了复合轧辊界面结合特征,测定了复合轧辊界面结合强度,分析了复合轧辊裂纹产生的原因,为热等静压法生产复合轧辊的进一步研究提供了工艺参考和实验依据。 相似文献
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热镀锌机组沉没辊系在锌锅内工作状态下受力情况复杂,受外界影响较大。充分考虑热镀锌机组设备与其工艺特点,首先分析沉没辊系在工作状态下受力情况,分别建立矫正辊插入量与包角的关系式、基于辊面锌渣沉积厚度的辊面摩擦因数经验模型。随后采用条元离散法建立沉没辊系辊面接触压力、摩擦驱动力矩模型,基于简支梁模型确定沉没辊系轴端支撑力、轴端摩擦阻力矩模型。最后将沉没辊系受力模型应用于国内某热镀锌机组镀锌工艺段,以典型规格带钢确定沉没辊系受力影响因素,并依据机组实际工况及板形要求来确定生产工艺参数的5种不同水平,来分析其对辊系受力状态的影响规律,为沉没辊系工艺优化提供指导依据。结果表明,4种工艺参数对辊系接触压力及摩擦力矩影响都存在差异性,矫正辊插入量与辊面接触压力呈现非线性关系;带钢张力对各辊接触压力影响程度不同,其中沉没辊受到的影响最大,而其余两辊受到张力几乎不影响;辊面平均摩擦因数、带钢速度对辊的接触压力几乎不影响;辊系摩擦驱动力矩、轴端摩擦阻力矩随着矫正辊插入量及辊面平均摩擦因数增大都呈现出不同程度增大。带钢张力与沉没辊摩擦驱动力矩、轴端摩擦阻力矩呈线性变化关系,而带钢张力对其余两辊影响很小。带钢速度对辊系的摩擦驱动力矩、轴端摩擦阻力矩影响很小。 相似文献
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To improve the accuracy and speed of finite element calculation,a new friction model was proposed,in which a layer of thin friction element between the roller and workpiece was introduced to consider the contact friction.This model was used in the three-dimensional elastic-plastic finite element model of strip rolling process.Taking the geometrical size and physical characteristics of intermediate medium between roller and workpiece into consideration,the stiffness of the friction element was corrected by two factors,i.e.,the thickness of friction element and β factor.Without any assumption about the value and direction of friction force and neutral point position,the rolling process was simulated by using this model.The results obtained by this model were compared with the experimental results and the feasibility of the model was verified. 相似文献
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Roller pass is one of the key factors affecting the product quality in the retained mandrel rolling process. The metal flow condition of rolling deformation area was researched using the FEA (finite element analysis) software Marc. The influences of the pass bottom radius, the sidewall radius, the sidewall angle, the roller shoulder fillet radius, as well as the roller gap on the rolling process under the conditions of different friction were discussed. Based on these results, the changes of the workpiece exit width, the mandrel axial force, the rolling force, and the rolling torque associated with various parameters were determined, which would provide the basis for designing the pass and determining the rolling condition reasonably. 相似文献
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《Baosteel Technical Research》2010,(Z1):64
Based on the ABAQUS explicit dynamic simulation platform,the finite element model of single stand mill with restrained mandrel was adopted to research the influence of mandrel - roller velocity ratio (MRVR),mandrel friction and tension between stands on rolling force.The analysis results show that when the MRVR is lower than 1,the rolling force increases obviously with the increase of MRVR and reaches the peak value when the MRVR is about 1.The rolling force increase induced by the MRVR increase is the main reason of the formation of the bulge defect on the tube head and tail at the entering and exiting stage during tube continuous rolling process by full floating mandrel mill,which can be intensified by the increase of mandrel friction coefficient.The rolling force decreases with the increase of tension.As the tension is larger, the rolling force decrease amplitude is larger.The influence of backward tension on rolling force is greater than that of forward tension distinctly.Tension control can be used to decrease the rolling force increase induced by the MRVR increase,which is imposing tension at the same time when the MRVR increases,in order to improve even eliminate the bulge defect,and enhance the tube dimension precision. 相似文献