40 北京科技大学学报 2000年第1期 1.004 ◆S=4mn 量和数据的统计分析得横向壁厚分布不均匀数 。5-5mm 值为：S-S.0.248mm. .002 4 S-6mm X S=7mm 实际生产的实测数据验证了以张力减径过 1.000 -S-8mm 。S=10mm 程模拟结果是正确可信的， 015=125mm 0.998 飞口5-16mm 4结论 0.996 0 20 40 60 80 通过对某钢管厂的152.5BR圆孔型系统的 ) 主变形单机架轧制过程模拟得：在圆周方向上 图7经银绩位置与孔型顶点互换叠加后各规格产生内 管子的等效塑性应变分布非均匀性，存在着一 六方趋势的相对壁厚分布 Fig.7 The trends of polygonization after changing the po- 定的附加变形，在辊缝位置处的等效塑性应变 sition at top and root of roll and adding up. 最大：经减径后管子沿圆周方向的壁厚分布不 70mm×10mm管子的实物形状照片见图8所示. 均匀，在辊缝位置处的壁厚为最大值，经叠加后 由图8可以看出管子的内表面存在明显的内多 产生内六方趋势.实际生产轧制试验验证了有 边形缺陷. 限元模拟结果的正确性， 实际生产中用152.5BR孔型系统生产◆ 参考文献 70mm×10mm管子的实物批量取样，经实际测 1 Voswinckel K.Process Management for Stretch-Reducing Tube Rolling Mills.Tube Intern,1995.64 (14):75 2 Holmstrom A.Linder S.New Technology for In-Line Con- trol.Tube Intern,1992.49(11):219 3 Mihara Y.Study on the Accuracy of Wall Thickness in Seamless Tube Rolling Process.Nippon Kokan Tech Rep. 1985.106(221 4 Mihara Y.Hirakawa T.Sodani Y.Polygoning Formation in Stretch Reducing Mill.Nippon Kokan Tech Rep. 1985,107(11229 5 Sodani Y,Hirakawa T.Mihara Y.Mechanism Polygoning Formation of Tube Bore in Stretch Reducing.Advanced Technology of Plasticity,1987.2(8):24 6 Yamada T.Yamada M.Matsukura S.Intemal Polygon For- mation of Stretch Reduced Tubes.-The Influence of 图8152.5BR孔型系统生产中70mm×10mm管的实 Tension and Compression during Rolling on Intemal 物形状照片 Polygon Formation.Technology Plastic,1993,34(12): Fig.8 The photo of 70 mmx10mm tube rolled by 1326 152.5BR passes system Finite Element Simulation of Tube Stretch-Reducing Wall Thickness Cross-section with Round Passes System PAN Keyun,WANG Xianjin",OING Guogin" 1)Material Science and Engineering School.UST Beijing.Beijingl00083.China 2)Baoshan Iron and Steel Group Corp.Shanghai 201900.China ABSTRACT On the base of finite element simulation for one stand of 152.5BR passes system in stretch- reducing mill,the distribution of equivalent plastic strain and tube wall thickness along the section is uneven. The position of maximum is located at the gap of roll.After changing the position at gap and root of roll and adding up,it results in polygonization of the wall thickness.Rolling tests for 152.5BR passes systems validate the result of finite element simulation. KEY WORDS stretch-reducing:FEM;tube rolling simulation;tube wall thickness