弯辊力对Q345R/316L不锈钢复合板热轧成形影响研究

EFFECT OF ROLL BENDING FORCE ON HOT ROLLING FORMING OF Q345R/316L STAINLESS STEEL CLAD PLATE

针对Q345R/316L不锈钢复合板真空热轧过程中弯辊力预设定问题,采用非线性有限元仿真软件MSC.Marc,建立不锈钢复合板轧制过程三维热-力耦合有限元模型,分别设定模型弯辊力为0 k N、300 k N、500 k N、800 k N四种边界条件,通过数值模拟研究了不同弯辊力作用下复合板宽度方向上的基板压下量、辊系弯曲变形以及半有载辊缝分布规律。分析了在不同弯辊力作用下界面应力应变的分布规律,根据界面结合状态判定条件,设定最佳弯辊力。结果表明:无弯辊力时板形呈现中部高边部低变化趋势,施加弯辊力时板形有了明显改善,并得出弯辊力最佳设定值为500 k N;在总变形量不变的条件下,随着弯辊力的增加,会促进基层和复层金属的变形,应力应变分布均匀,变形协调同性好,有利于复合板界面的结合。

Aimed at the presetting problems of the roll bending force during vacuum hot rolling of Q345R/316L stainless steel clad plates,a three dimensional thermo-mechanical finite element model of rolling for stainless steel clad plates was proposed by using the FE software MSC.MARC.Four boundary conditions of model bending roll force are set 0 kN,300 kN,500 kN and 800 kN respectively.The distribution law of reduction of the base plate,the bending deformation of the roll system and semi-loaded roll gap in the width direction of the clad plate under different bending roll forces were studied by numerical simulation.The distribution law of interfacial stress and strain under different bending roll forces was analyzed.According to the judgment condition of interface bonding condition,the optimum bending force was set.The simulation results show that the shape of plate appears high in the middle and low at the edge without bending force.When the roll bending force is applied,the shape of plate is obviously improved,and the optimum setting value of the bending force is 500 kN.Under the condition that the total deformation is constant,the increase of bending force will promote the deformation of the base metal and the cladding metal.Thus uniform stress-strain distribution and good coordinating deformation can be realized,which is beneficial to the interfacial bonding of clad plates.