摘要
针对某汽轮机叶片锻模出现根部裂纹失效等问题,采用有限元数值模拟技术分析了锻模应力场、温度场分布状态及锻模底部圆角对锻模应力分布的影响。结果表明:叶片锻模最大等效应力值为2 680 MPa,应力集中在叶根底部圆角处;叶根底部圆角半径由R5 mm增大到R12 mm,模具应力集中效应得到缓解,但锻模温度场有所增加;通过改进锻造工艺操作,使得坯料贴合大头端能够有效降低模具应力。
In order to eliminate the crack failure at the root of a forging die for turbine blades, the technology of finite element numeric simulation was used to analyze the effect of die stress field, temperature field distribution state and the bottom corner of forging die on the stress distribution. The results showed that the maximum equivalent stress value reached 2 680 MPa and the stress concentrated at the bottom of blade root fillet. To re- lieve the stress concentration, the fillet radius of blade root bottom was increased from 5 mm to 12 ram, but the temperature field of forging die has decreased. The stress of die was efficiently decreased by improving the forging processes.
出处
《模具工业》
2015年第9期56-59,63,共5页
Die & Mould Industry
关键词
汽轮机叶片
裂纹失效
数值模拟
模具应力
锻模
turbine blade
crack failure
numeric simulation
die stress
forging die
