Research On Rolling Forming For GH4169 Alloy Stator Blade

The engine blade has the characteristics of large load,high manufacturing accuracy,high degree of alloying,difficult to form and difficult to machining.Due to the large surface distortion of the blade,the cross section is more,the size of the surface is complex,using the traditional milling method,the tool loss is large,the processing cycle is long.The intake and exhaust edge of small radius is difficult to be formed when the electrochemical machining surface is used,and the electrochemical machining is heavy on environmental pollution and the cost is high.When the roll process is used to process the blade surface,it can simplify the working procedure,shorten the processing cycle,reduce the cost of processing,and improve the performance of the blade.The blade rolling process needs proper blade blank and high precision rolling die,so the proper roll deformation is needed to ensure the mechanical properties of the blade,It is necessary to adjust the technology of roll mill to ensure the dimensional accuracy,and a proper heat treatment system is needed to make the final performance of the blade meet the requirements of complex environment.This paper studied three main factors affecting roll forming,the rolling forming process of stator blade roller.The design of the blade blank is firstly established by the coordinate system,and then the flattening of the basin surface,the transformation of the profile coordinates,the addition of the blade root and blade section margin,the extension of the inlet and exhaust edge,and finally the blank design is completed.On the basis of the blade blank,the data points of each section of the blade type are extracted,and then imported into the coordinate system of each section of the mold respectively,and the transformation of the blade type facing the rotary die surface is completed.The mold cavity surface is obtained.Finally,according to the parameters of the device connection,the design of the rolling die installation part is completed,and the mold design is completed by combining the cavity and the installation part.It is found that the hardness of the blade increases gradually with the increase of roll deformation,When the deformation rate is 50%,the hardness of the blade reaches the maximum value,then decreased slightly.When the roll deformation is small,the delta phase begins to precipitate at the grain boundary and within a small amount.With the increase of the deformation,the grain boundary deformation elongate,and the fiber structure is formed.The delta phase precipitates in the vicinity of the fibrous structure,which is short rod and granular.With the increase of blade rolling deformation,the plasticity of the blade decreases gradually,and the elongation decreases.Leaves after rolling deformation,the rolling texture matrix,with the increase of deformation,the dislocation density increases,the dislocation movement difficulties,deformation resistance of leaves increased,the yield strength and tensile strength increased.The heat treatment of the rolling blade was carried out under different conditions.It was found that the air cooling could reduce the work hardening after holding 60 min at 990?,It is convenient for subsequent finishing rolling.When the finished blade is kept at 720±10? for 8h and 620±10? for 8h,the performance of the blade meets the applicable requirements.