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摘要棒材产品是我国钢产量中比重较大的一类品种，在国民经济建设中的使用十分广泛。一个现代化的棒材生产线，不仅需要实现从坯料到产品的塑性形变，保证产品的尺寸公差、表面质量和性能的要求，还需要以最低的生产成本来生产出具有最高质量的产品。对于连轧机来说，改变孔型尺寸影响的范围较大。优化孔型设计不仅可以提高轧制产品的质量和产量，还可以降低轧辊磨损，降低轧制能耗，减少生产事故，使轧制过程顺利进行，变形过程合理。但是，实际的孔型优化过程过于繁杂，所以使用计算机进行辅助研究是最适宜的。30870
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本文采用有限元商用分析软件DEFORM来优化孔型，先使用UG建立了圆钢连轧全过程的热力耦合三文有限元模型。为了建立边界条件，第一用Gleeble-1500热/力模拟实验机,对2Cr13钢的样品进行压缩热模拟实验,得到应力-应变曲线和力学参数。第二，用Φ130mm两辊实验轧机，轧制20m*20mm的2Cr13坯料，测出咬入角，来确定其摩擦系数。第三，用DSC扫描实验测出热传导系数。第四，用PCY热膨胀仪测定热膨胀系数。根据模拟的结果，调整椭圆孔的孔型，使其充满度达到理想。根据模拟结果分析轧件在轧制过程的速度场、各道次轧后轧件的断面形状和尺寸。提高轧制速度，发现头尾温差会变大，会影响孔型的尺寸精度。对着张力值的增大，发现孔型的欠充满越大。
毕业论文关键词：圆钢；孔型优化；有限元模拟
Abstract
Bar products are a larger proportion in our steel production of varieties,which are widely used in national economic construction. A modern production line of the bar is not only need to make the implement from blank to products of plastic deformation come true，to ensure of the product dimension tolerance，surface quality and performance requirements，but also need to produce the goods with the highest quality with the lowest cost of production. For tandem mill，the influence of changing groove size range is larger. The Optimization of pass design not only can improve the quality and yield of rolling products，but also can reduce the roll wear and tear，reduce the energy consumption of rolling，reduce production accidents，make the rolling process proceed smoothly，and make the process of deformation be reasonable. However，the actual groove optimization process is too complex，so the use of computer aided study is the most appropriate.
This article uses the finite element analysis commercial software DEFORM to optimize groove. Using UG to establish the round steel coupled thermo-mechanical
three-dimensional finite element model of rolling process. In order to set up boundary conditions，at first,using a Gleeble - 1500 thermal/mechanical simulation experiment machine to make the experience of hot compression simulation experience with samples of 2 cr13 steel，to get the stress-strain curve and mechanics parameters. Secondly，using Φ130 mm two-roll experimental mill rolls billet with 2Cr13 of 20 mm * 20 mm,to get the angle of nip ，to determine the coefficient of friction. Thirdly，using the DSC heat transfer coefficient measures coefficient of heat conduction. Fourthly，using PCY thermal expansion meter can measure the coefficient of thermal expansion.According to the result of simulation,adjusting the elliptical hole makes it reach the ideal one. Improving the rolling speed discovers that d-value of the head and tail temperature becomes larger,and also affects the dimensional accuracy of the pass. With the increase of tension，the pass in under full increases.
Key words：round steel；pass optimization；finite element simulation
目录
第一章 绪论 1
1.1 课题背景 1
1.2孔型设计的现状和孔型系统选择 1
1.2.1 椭圆-立椭圆-椭圆-圆孔型系统 2
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