Analytical Model Of GH4169 Blade Rolling And Development Of Simulation Platform

As an important component of aircraft,the aero-engine blade forming technology has always been a research hotspot.In recent years,the efficiency and precision of roll forming technology has displayed the good effect,but leaves the characteristics of variable cross-section caused roll roll process of mold cavity design and difficult.Therefore,it is of great significance to carry out the research on the forming mechanism of blade rolling and realize the precise shape control of rolling process.This article no tenons of superalloy GH4169 was investigated with a blade as the research object,based on the macroscopic model analysis method,the roller forming process of blades was analyzed.And secondary development of ABAQUS simulation platform to simulate the influence of process parameters on the forming quality leaf.Finally,the accuracy of the analytical model was verified through the roll experiment.The specific research contents are as follows:(1)In this paper,distortion projection was used to describe the radius function of rolling die for space curved surface,and an analytical model of roller rolling contact arc length was established.Then on the basis of analytical basic assumptions to built in the process of roll movement velocity field,the blade rolling area of differential,the internal plastic deformation power differential plane,friction and shear power.The total power functional of the rolling process of the differential surface was acquired by summing,and the formula of the rolling force of the differential surface was received by calculating the maximum value of the total power functional.Finally,the analytical formula of the total rolling force was obtained by summing up each differential area respectively.By programming and solving the analytical process of rolling force,the developed code can be used to calculate the rolling force and achieve the goal of fast prediction of rolling force.(2)The parameterized modeling of the simulation process was realized through the secondary development of pre-processing and GUI interface development on the ABAQUS simulation platform.The parameterization of blade and mold profile coordinates was completed,and the establishment of pre-processing kernel programs such as parts,material attributes,assembly and analysis steps were completed to match with the GUI interface.Basic conditions such as material basic parameters,boundary conditions and analysis steps can be set directly on the GUI interface to submit the job for numerical simulation.(3)Using the developed GUI interface parametric modeling,the numerical simulation of the rolling process was carried out to study the influence of different rolling process parameters(friction coefficient,reduction amount,roll speed)on the rolling force a nd rolling moment,equivalent stress and equivalent strain in the blade forming process.Then select the special position of the blade to get the equivalent stress and equivalent strain of the special points with time curve.(4)Finally,the blade rolling forming test was carried out.The blade profile data after rolling was measured by CMM,and the rolling force was obtained by analytical method.The blade profile data extracted from the simulation model and the actual profile data were verified.The accuracy of analytical prediction of rolling force and the accuracy of simulation model prediction of blade rolling profile were illustrated.Through the research on energy functional analysis of blade rolling forming and the development of ABAQUS numerical simulation platform,the rolling force can be predicted quickly,which provides a reference for the field preset model and improves the R&D and production efficiency.