Research on plastic deformation behaviour in cold ring rolling by FEM numerical simulation
Research on plastic deformation behaviour in cold ring rolling by FEM numerical simulation
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DOI：
10.1088/0965-0393/13/7/002
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发表时间：
2005-10
影响因子：
1.8
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中科院分区：
文献类型：
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冷环轧制是一种先进而复杂的金属成形工艺，受到轧辊和环坯几何尺寸、材料、成形参数、摩擦力等多因素的耦合作用。研究过程中变形区的塑性变形行为（塑性变形状态及其发展）对于快速预测金属流动、控制变形环件质量和优化冷环轧制工艺具有重要意义。在本文中，首先确定了塑性变形行为的决定性因素，即每转的平均进给量。然后，现在已经建立了各种工艺参数之间的函数关系。最后，通过ABAQUS软件环境下基于弹塑性动态显式有限元的3D数值模拟，发现冷环件轧制过程中存在3种塑性变形行为。一是变形区材料在加工初期完全进入塑性变形状态。二是变形区材料在此过程中逐渐进入塑性变形状态。最后，在加工结束时，环坯中间半径附近仍然存在处于弹性变形或小塑性应变状态的刚性区。在此基础上，探讨了环件冷轧过程中塑性变形行为对金属流动、环件变形不均匀程度以及力和功率参数的影响。该研究成果深入揭示了冷环轧变形机理，为冷环轧工艺参数优化和精确控制提供了重要依据。
Cold ring rolling is an advanced but complex metal forming process under coupled effects with multi-factors, such as geometry sizes of rolls and ring blank, material, forming parameters, friction, etc. Investigating the plastic deformation behaviour (the plastic deformation state and its development) in the deformation zone during the process is very significant for rapidly predicting the metal flow, controlling the quality of deformed rings and optimizing the cold ring rolling process. In this paper, a decisive factor on plastic deformation behaviour, namely the average amount of feed per revolution , has firstly been ascertained. Then a functional relation, between and various process parameters, has been now established. Lastly, through 3D numerical simulation based on the elastic–plastic dynamic explicit FEM under the ABAQUS software environment, it has been found that there are three kinds of plastic deformation behaviours during cold ring rolling operation. One is that the material in the deformation zone entirely comes into the plastic deformation state at the early stage of the process. Two is that the material in the deformation zone gradually comes into the plastic deformation state during the process. And last is that at the end of the process, there is still a rigid zone in elastic deformation or small plastic strain state near the middle radius of the ring blank. Based on this, the influence of plastic deformation behaviours on metal flow, the degrees of inhomogeneous deformation of ring and force and power parameters in the cold ring rolling process have been explored. The achievements of this study thoroughly reveal the deformation mechanism of cold ring rolling and provide an important basis for the optimization of process parameters and precise control of the cold ring rolling process.