厚板蛇形轧制压下量与咬入条件分析与研究
|
摘要
厚规格金属板经传统轧制后存在心部变形不充分的问题,导致心部性能普遍偏低,影响金属板的使用,为提高心部变形,开发了将异步轧制和板材矫直相结合的厚规格金属板蛇形轧制方法,根据轧制理论及蛇形轧制模型的特点建立了同径异速蛇形轧制和异径同速蛇形轧制辊缝补偿计算模型、压下量计算模型、咬入角计算模型以及实现金属板自然咬入的判据,进一步丰富了轧制理论。对计算模型进行分析,结果表明:同径异速和异径同速蛇形轧制上下工作辊压下量不同,且上工作辊的压下量大于下工作辊压下量,压下量之差与下工作辊偏移量和轧辊直径有关;实现蛇形轧制自然咬入的条件为摩擦角大于上下工作辊咬入角的平均值。
A thick( ultra-thick) hot rolled metal plate with fine inner properties cannot be easy to be obtained because of the lacking sufficient deformation in the inner part,and then the application will be affected. The snake rolling method which combined with the asymmetrical rolling and metal plate straightening was developed,in order to improve the deformation in the central region of metal plate. The roll gap compensation model,rolling reduction model,threading angle model and natural threading judgment basis of the snake rolling( the same diameter and different rotation snake rolling VS the different diameter and same rotation one) were established according to the rolling theory and the characteristic of snake rolling model. Then the rolling theory is enriched.Some conclusions were obtained: No matter the same roller diameter and different rotation rate or the different roller diameter and same rotation rate,the snake rolling reduction of the upper and lower roll is different,and that the upper roller rolling reduction is greater than that of the lower. The deviation of rolling reduction is related to the roll offset distance and roller diameters. The frictional angle should be greater than the threading angle of average upper and lower roll in order to achieve natural threading for snake rolling.
A thick( ultra-thick) hot rolled metal plate with fine inner properties cannot be easy to be obtained because of the lacking sufficient deformation in the inner part,and then the application will be affected. The snake rolling method which combined with the asymmetrical rolling and metal plate straightening was developed,in order to improve the deformation in the central region of metal plate. The roll gap compensation model,rolling reduction model,threading angle model and natural threading judgment basis of the snake rolling( the same diameter and different rotation snake rolling VS the different diameter and same rotation one) were established according to the rolling theory and the characteristic of snake rolling model. Then the rolling theory is enriched.Some conclusions were obtained: No matter the same roller diameter and different rotation rate or the different roller diameter and same rotation rate,the snake rolling reduction of the upper and lower roll is different,and that the upper roller rolling reduction is greater than that of the lower. The deviation of rolling reduction is related to the roll offset distance and roller diameters. The frictional angle should be greater than the threading angle of average upper and lower roll in order to achieve natural threading for snake rolling.
引文
[1]L.Y.Jiang,C.J.Zhao,G.Yuan,et al.Thicker steel plate shape-changing law and control method during the snake rolling process[J].Metallurgical Research and Technology,2016,113(03):1-11.
[2]G.Y.Tzou,M.N.Huang.Study on the minimum thickness for the asymmetrical PV cold rolling of sheet[J].Journal of Materials Processing Technology,2000,105(03):344-351.
[3]G.Y.Tzou,M.N.Huang.Study on minimum thickness for asymmetrical hot-and-cold PV rolling of sheet considering constant shear friction[J].Journal of Materials Processing Technology,2001,119(01-03):229-233.
[4]H.Gao,S.C.Ramalingam,G.C.Barber,et al.Analysis of asymmetrical cold rolling with varying coefficients of friction[J].Journal of Materials Processing Technology,2002,124(01-02):178-182.
[5]M.Kadkhodaei,M.Salimi,M.Poursina.Analysis of asymmetrical sheet rolling by a genetic algorithm[J].International Journal of Mechanical Sciences,2007,49(05):622-634.
[6]S.H.Zhang,D.W.Zhao,C.R.Gao,et al.Analysis of asymmetrical sheet rolling by slab method[J].International Journal of Mechanical Sciences,2012,65(01):168-176.
[7]F.Q.Zuo,J.H.Jiang,A.D.Shan,et al.Shear deformation and grain refinement in pure Al by asymmetric rolling[J].Transactions of Nonferrous Metals Society of China,2008,18(04):774-777.
[8]W.J.Kim,J.B.Lee,W.Y.Kim,et al.Microstructure and mechanical properties of Mg-Al-Zn alloy sheets severely deformed by asymmetrical rolling[J].Scripta Materialia,2007,56(04):309-312.
[9]J.K.Lee,D.N.Lee.Int.Texture control and grain refinement of AA1050 Al alloy sheets by asymmetric rolling[J].International Journal of Mechanical Sciences,2008,50(05):869-887.
[10]A.Wauthier,H.Regle,J.Formigoni,et al.The effects of asymmetrical cold rolling on kinetics,grain size and texture in IF steels[J].Materials Characterization,2009,60(02):90-95.
[11]H.Hallberg.Influence of process parameters on grain refinement in AA1050 aluminum during cold rolling[J].International Journal of Mechanical Sciences,2013,66(01):260-272.
[12]Y.B.Zuo,X.Fu,J.Z.Cui,et al.Shear deformation and plate shape control of hot-rolled aluminum alloy thick plate prepared by asymmetric rolling process[J].Transactions of Nonferrous Metals Society of China,2014,24(07):2220-2225.
[13]付垚,谢水生,熊柏青,等.铝合金蛇形轧制轧板曲率解析模型研究[J].稀有金属,2011,35(06):805-811.
[14]付垚,谢水生,熊柏青,等.主应力法计算蛇形轧制的轧制力[J].塑性工程学报,2010,85(17):103-109.
[15]T.Zhang,Y.X.Wu,H.Gong,et al.Effects of rolling parameters of snake hot rolling on strain distribution of aluminum alloy 7075[J].Transactions of Nonferrous Metals Society of China,2014,24(07):2150-2156.
[2]G.Y.Tzou,M.N.Huang.Study on the minimum thickness for the asymmetrical PV cold rolling of sheet[J].Journal of Materials Processing Technology,2000,105(03):344-351.
[3]G.Y.Tzou,M.N.Huang.Study on minimum thickness for asymmetrical hot-and-cold PV rolling of sheet considering constant shear friction[J].Journal of Materials Processing Technology,2001,119(01-03):229-233.
[4]H.Gao,S.C.Ramalingam,G.C.Barber,et al.Analysis of asymmetrical cold rolling with varying coefficients of friction[J].Journal of Materials Processing Technology,2002,124(01-02):178-182.
[5]M.Kadkhodaei,M.Salimi,M.Poursina.Analysis of asymmetrical sheet rolling by a genetic algorithm[J].International Journal of Mechanical Sciences,2007,49(05):622-634.
[6]S.H.Zhang,D.W.Zhao,C.R.Gao,et al.Analysis of asymmetrical sheet rolling by slab method[J].International Journal of Mechanical Sciences,2012,65(01):168-176.
[7]F.Q.Zuo,J.H.Jiang,A.D.Shan,et al.Shear deformation and grain refinement in pure Al by asymmetric rolling[J].Transactions of Nonferrous Metals Society of China,2008,18(04):774-777.
[8]W.J.Kim,J.B.Lee,W.Y.Kim,et al.Microstructure and mechanical properties of Mg-Al-Zn alloy sheets severely deformed by asymmetrical rolling[J].Scripta Materialia,2007,56(04):309-312.
[9]J.K.Lee,D.N.Lee.Int.Texture control and grain refinement of AA1050 Al alloy sheets by asymmetric rolling[J].International Journal of Mechanical Sciences,2008,50(05):869-887.
[10]A.Wauthier,H.Regle,J.Formigoni,et al.The effects of asymmetrical cold rolling on kinetics,grain size and texture in IF steels[J].Materials Characterization,2009,60(02):90-95.
[11]H.Hallberg.Influence of process parameters on grain refinement in AA1050 aluminum during cold rolling[J].International Journal of Mechanical Sciences,2013,66(01):260-272.
[12]Y.B.Zuo,X.Fu,J.Z.Cui,et al.Shear deformation and plate shape control of hot-rolled aluminum alloy thick plate prepared by asymmetric rolling process[J].Transactions of Nonferrous Metals Society of China,2014,24(07):2220-2225.
[13]付垚,谢水生,熊柏青,等.铝合金蛇形轧制轧板曲率解析模型研究[J].稀有金属,2011,35(06):805-811.
[14]付垚,谢水生,熊柏青,等.主应力法计算蛇形轧制的轧制力[J].塑性工程学报,2010,85(17):103-109.
[15]T.Zhang,Y.X.Wu,H.Gong,et al.Effects of rolling parameters of snake hot rolling on strain distribution of aluminum alloy 7075[J].Transactions of Nonferrous Metals Society of China,2014,24(07):2150-2156.