锻造操作机末端运动轨迹对300MW发电机转子轴向中心线上等效应变的影响

Effects of Forging Manipulator Motion Trajectory on Axial Effective Strain in 300MW Generator Rotor Forgings

以300MW发电机转子的锻造拔长过程为例,针对操作过程没有错砧、偶数道次错砧量为名义送进量的1/2和按照锻件变形尽可能均匀原则选择偶数道次错砧量等方案,设计3种不同的锻造操作机末端运动轨迹,综合分析锻造操作机末端运动轨迹对锻件轴向中心线上等效应变分布的影响。结果表明,根据变形均匀性原则设置错砧量的方案明显优于另外两个方案,与没有错砧的方案和错砧量为名义送进量一半的方案相比较,锻件中间段轴向中心线上的最小等效应变值分别增大了15%、22%,中间段等效应变平均值分别增大了5.6%、6.2%,且轴向中心线上的等效应变分布最均匀。因此,在规划锻造操作机末端运动轨迹时,必须考虑拔长操作过程中的错砧工艺,而且错砧量要根据锻件变形尽可能均匀的原则优化选择。

The stretching process of 300 MW generator rotor is taken as an example,three different forging manipulator motion trajectories are established based on the scheme 1（anvil offset is zero） ,scheme 2（anvil offset is half of feed） and scheme 3（anvil offset is according to the need of practice process） . The effects of different stretching processing at the same process parameters on effective strain in longitudinal center line of forging are studied. The results show that the scheme 3 is better than scheme 1 and 2. By comparison,the minimum effective strains in longitudinal center line of forging after all passes is increased by 15% and 22%,and the average effective strains in intermediate parts are increased by 5.6% and 6.2%,respectively. Furthermore,the axial effective strain distribution is the most even one. Therefore,anvil offset should be considered based on the most uniform deformation principle in planning the forging manipulator motion trajectory.