LFJ异质钛合金连接区铣削残余应力形成机理及分布规律

项目名称： LFJ异质钛合金连接区铣削残余应力形成机理及分布规律

项目编号： No.51305199

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 汪洪峰

作者单位： 南京航空航天大学

项目金额： 25万元

中文摘要： 目前航空发动机整体叶盘制造主要采用电铸方法，但这种方法对环境污染太大，为了避免这种污染，国内有采用线性摩擦连接(简称LFJ)和高速铣削相结合的方法制造整体叶盘，但这种方法易造成LFJ连接区域铣削残余应力分布不均匀，导致叶盘变形较大。本课题针对异质钛合金LFJ连接区域铣削残余应力进行分析，认为初始应力(材料本身应力和LFJ连接应力)、装夹应力和铣削应力是形成异质钛合金LFJ连接区域铣削残余应力的主要组成部分。因此，本课题就从这三大应力入手，通过机理分析与实验研究，揭示异质钛合金LFJ连接机理及其应力分布规律；通过对异质钛合金LFJ连接区域高速铣削加工机理、铣削力、铣削温度、装夹方式、铣削方式等研究，建立异质钛合金LFJ连接区域铣削模型，通过此铣削模型并结合LFJ连接区域残余应力分布规律，建立异质钛合金LFJ连接区域铣削应力模型，最终获得异质钛合金LFJ连接区域铣削铣削应力分布规律。

中文关键词： 高速铣削加工；残余应力；LFJ；钛合金；叶盘

英文摘要： At present the electroforming method is mainly adopted for aircraft engine overall blisk manufacturing, but this method is too much pollution to the environment. In order to avoid this kind of pollution, linear friction jointed (LFJ) and high speed milling method have been adopted for the overall blisk manufacturing at home, but this method is easy to cause LFJ jointing area milling residual stress uneven distribution and the blisk deformation is bigger. Heterogeneous titanium alloy LFJ jointing area milling residual stress will be analyzed in this project, and the initial stress (material itself stress and LFJ jointing stress), clamping stress and stress formation is the main component of heterogeneous itanium alloy LFJ jointing area milling residual stress. Therefore, this project is from the three stress, through the mechanism analysis and experimental research, reveal heterogeneous titanium LFJ jointing mechanism and the stress distribution law; Based on heterogeneous titanium alloy LFJ jointing area high speed milling processing mechanism, milling force, milling temperature, milling method, the clamping way, the heterogeneous titanium alloy LFJ jointing area milling model will be established. Through the milling model and LFJ jointing area residual stress distribution, heterogeneous titanium alloy LFJ joint

英文关键词： high-speed milling；residual stress；LFJ；titanium alloys；blisk