汽轮机叶片汽道加工中受力及变形分析

Stress and Deformation Analysis in Turbine Blade Profile Machining

汽轮机叶片汽道加工变形是影响加工质量的关键。为了提高汽轮机叶片在加工过程中的质量,减小其在加工过程中的形位误差,在各切削力模型的基础上研究了球头铣刀在出汽边铣削中的几何加工特征,构建铣削力模型,分析了叶片汽道加工过程中的受力和变形。结合汽轮机中压缸第二级动叶片结构参数,采用材料力学理论分析法,构建了汽轮机动叶片汽道加工中的力学模型,并对叶片汽道加工中弯曲与扭转变形进行分析,得出影响叶片加工质量的因素,为后续的叶片夹具设计提供理论依据。

Deformation of blade profile is the key that impacts the quality of turbine blade.In order to improve the processing quality of turbine blades,reduce its form and position errors in the process,the geometric machining features of ball end mill in machining trailing edge are studied and milling force model is constructed on the basis of different milling force models and the force and deformation in the process are analyzed.Using material mechanics analysis method,mechanical model of turbine blade profile part machining is constructed,and bending and torsion deformation are analyzed combining to the second move leaves of intermediate pressure cylinder of steam turbine.Factors influenced on the quality of the blade precision processing are obtained,which provides theory basis for the subsequent leaves fixture design.