上平下V形砧锻造阶梯轴关键技术的研究

Research on Key Technologies for Forging Stepping Shaft between Upper Flat and Lower V-shaped Anvil

建立了上平下V形砧拔长圆轴的力学模型,分析了各区的应力与变形;提出了上平下V形砧锻造阶梯轴台阶的操作原则,确定了坯料转动角度与压下量的匹配关系;针对1365mm支承辊坯的台阶拔长,按新操作原则制订了工艺参数,进行了数值模拟。结果表明:变形区应力状态好,中心区域的锻透性良好,变形部分轴线的偏移量小。按新技术进行了实际生产,制造的锻件经超声波探伤证实为合格,锻造中变形部分的轴线偏移量小于要求值。

A new mechanics model was established for forging round shaft between upper flat and lower V-shaped anvil,the stress state and deformation were analyzed.The operation principles for forging round stepping-shaft were proposed,the matching relation between turning angle and compression ratio was determined.Aimed at forging the steps of 1365 bearing roller,the technological parameters were formulated,the numerical simulation was done with DEFORM soft.The results indicate that the stress state in the deformation zone is good and the deformation is homogeneous,and the axis deflection of deformation zone is small.Forgings which are made according to the new technology pass ultrasonic flaw detection,and the axis deflection of deformation zone is lower than the requirements during the drawing process.