基于加工特征的铣削力预测研究  

Numerical prediction of milling forces based on machining feature

作　　者：赵凯[1] 刘战强[1] 

机构地区：[1]山东大学高效洁净机械制造教育部重点实验室,济南250061

出　　处：《现代制造工程》2014年第6期86-92,共7页Modern Manufacturing Engineering

基　　金：国家科技重大专项资助项目(2014ZX04012-014)

摘　　要：航空发动机广泛采用钛合金薄壁结构,薄壁件在铣削加工过程中受铣削力的影响易于产生加工变形,影响加工质量。为减少加工变形,提高加工质量,需对铣削加工过程中的铣削力进行预测。为此,以Johnson-Cook本构方程为基础,考虑材料热力学动态性能和断裂准则对铣削力的影响,建立了基于加工特征的钛合金Ti-6Al-4V铣削力预测模型。首先,利用UG/Open工具模块对UG软件进行二次开发,创建了零件加工特征知识库。然后,利用Deform-3D仿真软件对材料本构模型、切屑分离和切屑断裂准则等进行描述,建立钛合金Ti-6Al-4V铣削加工有限元模型,对铣削力进行预测。铣削力实验证明了预测模型的可行性。最后,利用建立的有限元模型研究了工件曲率半径对铣削力的影响。结果表明,圆弧内轮廓铣削过程中的铣削力较大,圆弧外轮廓铣削过程中的铣削力较小。Thin-walled structures with titanium alloy are widely used in aircraft engine .However , deflection induced by cutting force will reduce the finished part accuracy due to the lower rigidy of thin-walled structure .The amount of cutting force must be accurately predicted to improve the machining precision of thin-walled parts.A numerical prediction model for milling force of Ti-6Al-4V titanium alloy is developed based on the Johnson-Cook constitutive equation ,UG geometric modeling and Deform-3D fi-nite element simulation .The effects of the material properties and fracture criterion on the milling force are considered during sim -ulation modeling.Firstly,the knowledge-base of features for aero-engine components is created by UG software .Then,the finite el-ement model of milling process is established by modeling the material constitutive relationship ,chip fracture and material separa-tion criteria.The machining experiments are conducted to validate the feasibility of the proposed simulation model .Lastly,an im-pact of the workpiece radius of curvature on milling force is researched with the developed finite element model .The results show that the maximum milling force will be generated during machining the inner contour , while the minimum milling force will be generated during machining the outer contour .

关 键 词：铣削力 加工特征 本构方程 断裂准则 曲率变径 

分 类 号：TG714[金属学及工艺—刀具与模具] TG501.3