小尺寸轮盘榫槽拉刀结构参数优化设计研究  

Research on Structural Parameter Optimization Design of Small-size Disc Tenon Broach

作　　者：易林峰 吴时盛 李克 徐从昌[2] 何洪 Yi Linfeng;Wu Shisheng;Li Ke;Xu Congchang;He Hong(AECC South Industry Co.,Ltd.,Zhuzhou,Hunan 412002,China;不详;College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中国航发南方工业有限公司,湖南省株洲市412002 [2]湖南大学机械与运载工程学院,长沙市410082

出　　处：《工具技术》2021年第6期57-63,共7页Tool Engineering

基　　金：国家自然科学基金面上项目(51975201);国家重点研发计划项目(2016YFB01011704);湖南省自然科学基金青年项目(2019JJ50054)。

摘　　要：以拉削成形加工GH4720Li高温合金涡轮盘纵树型榫槽用ASP2015材质拉刀为研究对象,研究了刀具结构参数对拉削力、刃口应力分布等的影响规律及优化方法。以拉刀三维几何模型、GH4720Li合金的室温拉伸力学性能、热物性参数和实际拉削工况为输入参数,建立了拉削的热-力耦合有限元仿真模型,通过拉削实验所测的拉削力与仿真值对比,验证了模型的有效性。模拟了多种刀具结构参数下的拉削力变化规律,结果表明:拉削力对刃口钝圆半径、前角、齿升量和拉削速度影响较大,刀具后角对拉削力影响较小,但后角过小会降低已加工零件的表面质量。综合考虑拉削效率和拉刀的刀齿强度,以降低拉削力为目的,对纵树型榫槽拉刀进行结构仿真优化和验证,得到最优参数组合为:刃口钝圆半径0.02mm,刀具前角18°,齿升量0.02mm,刀具后角3°,拉削速度2m/min,使拉削力有效降低了34%以上。Using an ASP2015 broach for longitudinal tree tenon groove of GH4720li superalloy turbine disk as the studying target,the influence of tool structure parameters on broaching force and edge stress distribution are investigated.The optimization method of the broach structure is explored.Based on the three-dimensional geometry model of the broach,the tensile mechanical properties at room temperature,thermophysical parameters and actual broaching conditions of the GH4720li alloy,a coupled thermal mechanical finite element simulation model is established.The effectiveness of the model is verified by comparing the broaching forces measured by broaching experiments with the simulation values.The results show that broaching force is very sensitive to the edge rounding radius,rake angle,tooth lift and broaching speed,while the flank angle has little effect on the broaching force,and a smaller flank angle will reduce the surface quality of machined parts.Considering the broaching efficiency and strength of broach teeth,in order to reduce broaching force,the structure simulation optimization and verification of longitudinal tree tenon groove broach are realized.The optimal combination parameters are as follows:cutting edge rounding radius is 0.02mm,rake angle is 18°,tooth lift is 0.02mm,relief angle is 3°,broaching speed is 2m/min.Through the optimal combination parameter,the broaching force can be decreased by more than 34%.

关 键 词：涡轮盘榫槽 拉削成形 拉刀设计 有限元仿真 

分 类 号：TG715[金属学及工艺—刀具与模具] TH164[机械工程—机械制造及自动化]