【摘要】 基于大变形Lagrange有限元理论、修正的JC本构关系和Cockroft-Latham切削断裂标准建立了超精密切削的三维有限元模型.采用此模型研究切削条件对超精密切削表面质量的影响.仿真结果表明:适当增大刀具后角,可使工件表面的最大位移变化量有所下降,提高加工质量;刀尖半径对加工表面质量影响较大,刀尖半径越小,加工表面质量越好;切削深度对加工表面质量的影响不明显,为了保证加工效率,切削深度一般和刀尖半径相当;切削速度影响表面质量和切削效率,速度太大或太小都会影响加工表面质量,加工铝合金时切削速度为150,m/min左右.最后试验结果验证了模型的正确性.更多还原

【Abstract】 Based on Lagrange formulation,modified JC material model and criteria of Cockroft-Latham,a 3D finite element model(FEM) of ultraprecision cutting was presented.Effects of cutting condition on surface quality were analyzed by the model.Results show that,with the increase of clearance angle,displacement of machined surface decreases and surface quality improves.The tool edge radius has influence on surface quality,and surface quality in-creases with the decrease of tool edge radius.The effect of cutting depth on surface quality is not obvious,and the cutting depth is equal to the tool edge radius in order to improve machining efficiency.Cutting speed influences both surface quality and machining efficiency,and the cutting speed is approximately 150 m/min for cutting aluminum al-loy.Experiments verified the accuracy of the given model.更多还原