Design and grindability assessment with cup shaped electroplated CBN wheel grinding turbine disc slots of powder metallurgy superalloy FGH96  

作　　者：Benkai LI Wenfeng DING YeJun ZHU Changhe LI Yanbin ZHANG Min YANG Xiao MA Mingzheng LIU Xin CUI 

机构地区：[1]School of Mechanical Engineering,Qingdao University of Technology,Qingdao 266520,China [2]National Key Laboratory of Science and Technology on Helicopter Transmission,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [3]College of Engineering,Nanjing Agricultural University,Nanjing 210031,China

出　　处：《Chinese Journal of Aeronautics》2024年第9期521-534,共14页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.52305477,52375447,52305474);Major Special Projects of Aero-engine and Gas Turbine (No.2017-VII-0002-0095);the Special Fund of Taishan Scholars Project (No.tsqn202211179);the Youth Talent Promotion Project in Shandong (No.SDAST2021qt12);the Natural Science Foundation of Shandong Province (Nos.ZR2023QE057,ZR2022QE028,ZR2021QE116,and ZR2020KE027);Qingdao Science and Technology Planning Park Cultivation Plan (No.23-1-5-yqpy-17-qy);the Natural Science Foundation of Jiangsu Province (No.BK20210407).

摘　　要：The machining surface integrity of aero-engine turbine disc slots has a significant impact on their fatigue life and service performance,and achieving efficiency and high-precision machining is still a great challenge.The high machining requirements of future aeroengine turbine disc slots will be difficult to satisfy using the broaching method.In addition,existing methods of slot machin-ing face difficulties in ensuring surface integrity.This study explored a cup shaped electroplated Cubic Boron Nitride(CBN)abrasive wheel for profile grinding the turbine disc slots of FGH96 powder metallurgy superalloy.The matrix structure of the cup shaped abrasive wheel was designed and verified.A profile grinding experiment was conducted for fir-tree slots on a five-axis machining center.The accuracy and the surface integrity were analyzed.Results show that the key dimension detection results of the slots were within the allowable tolerance range.Meanwhile,an average sur-face roughness Ra of 0.55μm was achieved,the residual stress was compressive,the plastic defor-mation layer thickness was less than 5μm,and the hardening layer thickness was less than 20μm.The research findings provide a new approach to machining the slots of aviation engine turbine discs and guidance for the high-quality processing of complex components.

关 键 词：Profile grinding Surface integrity Cup shaped CBN abrasive wheel Turbine disc slots FGH96 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]