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中文摘要：
楔横轧多楔轧制是内楔和外楔同时对轧件进行径向压下、轴向延伸的塑性成形。随着交通运输业的飞速发展，火车轴、汽车半轴等长轴类零件的需求量与日俱增，采用楔横轧多楔工艺成形长轴类零件，具有显著节省辊面、减小设备体积、生产效率高、节材、降低成本等优点。为了充分发挥多楔显著节省辊面的优点，保持内外楔同时起楔，就必须要准确弄清楔入段移动量的变化规律。采用弹塑性有限形变有限元数值方法，根据实际工况模拟楔横轧轧制过程，分析楔入段移动量的变化规律，详细阐述各工艺参数对移动量的影响规律，并与试验测试结果进行比较，得到楔入段端面移动量的变化和影响规律。研究结果为楔横轧多楔同步轧制模具设计提供了重要的理论依据，进一步完善了楔横轧多楔轧制理论。
英文摘要：
Multi-wedge cross wedge rolling （MCWR） is one kind of plastic forming, including radial screwdown, axial extension and horizontal enlarging by both wedges at the same time. With the fast development of traffic and transport industry, the demand for long shafts such as train shafts and automobile semi-axes is daily on the increase. MCWR has many advantages in forming long shafts, such as saving roll surface remarkably, reducing equipment volume, high production efficiency, saving material and reducing cost. To give full play to the advantage of multi-wedge in significantly saving roll surface and to maintain wedging the work piece simultaneously by internal and external wedges, it is necessary to accurately ascertain the regularity of movement of the end of wedged parts. Elastic-plastic finite deformation finite element numerical method is used. The cross wedge rolling （CWR） process is simulated successfully according to actual operating conditions, the regularity of movement of wedged parts is analyzed and the regularity how movement is affected by technological parameters is elaborated. The regularity of movement of the end of wedged parts is discovered after the analog results are compared to the experimental results. The research results provide an important theoretical basis for the design of MCWR moulds and perfect the theory of MCWR.
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