某型燃机双联实心导向叶片精密铸造过程尺寸控制

Dimension Control of Gas Turbine Solid Guide-vane during Investment Casting

采用三维光学扫描技术分析了大尺寸双联实心等轴晶叶片生产阶段的变形和收缩数据以及蜡模不同放置方式对其尺寸的影响,最终获得了叶片合适的收缩率和尺寸控制方法。结果表明,叶片沿主轴方向(Z向)收缩率从进气边往排气边逐渐增大,盆背方向(Y向)收缩率从进气边向排气边逐渐减小,盆背方向及进排气方向(X向)收缩率均是大缘板显著小于小缘板。叶型变形主要是由于蜡模及浇注过程引起,而在控制蜡模变形的方式上,蜡模侧放-叶背朝下的放置方式最有利于减小尺寸变形。

The deformation and shrinkage data of large-scale double solid equiaxed crystal vanes were analyzed by 3 D optical scanning technology,and influence of different wax placement ways on the dimension were investigated to obtain the appropriate control method of vane shrinkage and dimension.The results reveal that the shrinkage factor along spindle direction(Z)is increased from the leading edge to the exhaust edge,while that along basin-back direction(Y)is decreased from the leading edge to the exhaust edge.The shrinkage factors of large flange are much smaller than small flange along both inlet-outlet(X)and basin-back direction.Blade deformation is mainly induced by wax making and pouring process.In view of wax pattern deformation,placing wax laterally with the backside of vane downward is the most conducive to reducing deformation.