MPM限动芯棒钢管连轧过程数值模拟及宽展分析

发布时间：2019-01-04 09:16

【摘要】：无缝钢管是我国国民经济建设的重要原材料之一。MPM(Multi-Stand Pipe Mill)限动芯棒连轧管机组是近年来热轧无缝钢管生产的主流机型,它的生产能力和产品质量直接影响着我国无缝钢管的生产能力及国际竞争力。目前,许多企业都以提高产品的规模、降低生产的成本和提高产品质量来获得市场竞争力。因此,开展MPM连轧管轧制过程的分析和宽展研究,具有重大的实用价值,为进一步分析钢管连轧成型规律,预报产品尺寸精度和性能,具有重大意义,对进一步优化设备参数,提高产品的质量提供借鉴作用。本文以某钢管厂的限动芯棒连轧管机为研究对象,采用Marc有限元软件,建立了无缝钢管连轧过程的三维热力耦合有限元模型。以现场的连轧管机为实验设备,现场生产的荒管为实验材料,测量钢管的外形尺寸和各机架轧制力。将模拟结果与实测数据进行对比,钢管外径的相对误差为0.22%,壁厚的相对误差为3.3%,机架轧制力均值的最大误差为4.79%,验证了有限元模型的正确性。在此基础上,分析了无缝钢管连轧过程中钢管出口形状、轧制温度变化、应力应变以及金属的流动规律;研究了轧辊参数(轧辊孔型主半径、轧辊孔型偏心距、轧辊半径)、摩擦系数(轧辊摩擦系数、芯棒摩擦系数)和速度制度(轧辊转速、芯棒速度)对轧制力能参数的影响。孔型设计是连轧管机组的技术核心。孔型金属截面面积计算是孔型设计中的一个重要环节,而钢管的宽展对孔型金属截面面积的精确计算起着重要作用。本文通过对不同孔型、不同规格产品的系列仿真,研究了宽展规律的影响因素:延伸系数和空隙率对周长系数的影响,延伸系数和减径率对壁厚系数的影响以及轧辊转速对宽展规律的影响。
[Abstract]:Seamless steel pipe is one of the important raw materials in the national economic construction of our country. The. MPM (Multi-Stand Pipe Mill) mandrel mill is the main type of hot rolled seamless steel pipe in recent years. Its production capacity and product quality directly affect the production capacity and international competitiveness of seamless steel tubes in China. At present, many enterprises to improve the scale of products, reduce production costs and improve product quality to achieve market competitiveness. Therefore, it is of great practical value to study the rolling process of MPM continuous rolling pipe. It is of great significance to further analyze the forming law of steel tube continuous rolling and predict the dimensional accuracy and performance of the product, and it is also of great significance to further optimize the equipment parameters. Improve the quality of products to provide reference. In this paper, a three-dimensional thermo-mechanical coupled finite element model of seamless steel tube continuous rolling process is established by using Marc finite element software, taking the limited motion mandrel mill in a steel pipe factory as the research object. Taking the continuous rolling mill as the experimental equipment and the raw pipe produced in the field as the experimental material, the shape and size of the steel pipe and the rolling force of each stand are measured. Comparing the simulation results with the measured data, the relative error of outer diameter of steel pipe is 0.22, the relative error of wall thickness is 3.3, and the maximum error of the mean value of rolling force is 4.79, which verifies the correctness of the finite element model. On this basis, the outlet shape, rolling temperature change, stress strain and metal flow law of seamless steel tube during continuous rolling are analyzed. The effects of roll parameters (roll pass radius, roll pass eccentricity, roll radius), friction coefficient (roll friction coefficient, mandrel friction coefficient) and speed regime (roll rotation speed, mandrel speed) on rolling force and energy parameters were studied. Pass design is the core of continuous tube mill. The calculation of the cross section area of the pass metal is an important link in the pass design, and the width of the steel pipe plays an important role in the accurate calculation of the section area of the pass metal. In this paper, through the series simulation of different pass and specification products, the influence factors of the law of width are studied: the influence of the extension coefficient and the void ratio on the circumference coefficient. The influence of extension coefficient and diameter reduction rate on the wall thickness coefficient and the influence of roll rotation speed on the spread rule.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG335.7

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