GH4169合金低压涡轮机匣异形环锻件胀形工艺

Bulging process for GH4169 alloy low-pressure turbine casing profile ring forgings

为了解决低压涡轮机匣异形环锻件轧制成形精度低、余量大、材料利用率低、周期长等问题,采用数值模拟与工艺试验试制相结合的方法,研究了GH4169合金低压涡轮机匣异形环锻件胀形工艺。模拟研究阐明了胀形变形量对低压涡轮机匣轧制成形锻件的应力、应变、温度分布及均匀性的影响规律,综合考虑建议胀形变形量取1.5%较为合理;胀形过程的工艺试制研究表明,通过胀形工艺对轧制成形的GH4169合金低压涡轮机匣异形环锻件进行整形,可显著降低锻件的椭圆度、提高锻件的尺寸精度,减小锻件余量并提高余量均匀性,提高材料利用率,同时可有效提高锻件的力学性能及其均匀性。锻件余量均匀性的提高也可有效减小低压涡轮机匣零件的机加工变形。

In order to solve the problems of low accuracy,big allowance,low material utilization rate and long period for manufacturing in the rolling process of low-pressure turbine casing profile ring forgings,the bulging process of GH4169 alloy low-pressure turbine casing profile ring forgings was studied by the method of combining numerical simulation and process trial production.The simulation study clari-fied the influence laws of the bulging deformation amount on the stress,strain,temperature distributions and uniformities of low-pressure turbine casing profile ring forgings.Then,through comprehensive consideration,the bulging deformation amount was suggested to be 1.5%,which was more reasonable.The trial production research of the bulging process shows that the GH4169 alloy low-pressure turbine casing profile ring forgings are reshaped by the bulging process,which significantly reduces the ellipticity of forgings,improves the dimen-sional accuracy of forgings,reduces the forgings allowance,increases the uniformity of allowance,improves the material utilization rate of forgings,and at the same time effectively improves the mechanical properties and the uniformity of forgings.Finally,the improvement of the uniformity of the forgings allowance can effectively reduce the mechanical deformation of the low-pressure turbine casing parts.