摘要
基于大变形有限元理论和更新的拉格朗日方程式,建立热机械耦合的平面应变正交切削模型,并利用通用的商业有限元软件,对6061铝合金的超精密切削过程进行有限元仿真.分析金刚石刀具前角对切削力、切屑变形、切屑根部最大应变、作用于前刀面最大压应力和切削温度分布的影响.结果表明:随前角由负向正变化,切屑厚度变小而长度变长、切屑的曲率半径随着变小,切削力和切屑-刀具接触面上最大压应力则随之下降,刀尖附近的切削温度逐步上升,但切屑根部的最大应变则保持不变.以此优选金刚石刀具前角.
Based on large deformation theory and updated Lagrangian procedure, a coupled thermo-mechanical plane strain model of orthogonal cutting process is developed. And resorting to a finite element model, the ultra-precision cutting process of 6061 aluminum alloys is simulated by utilizing general commercial software. The influences of rake angles on cutting forces, chip deformation, maximal strains of chip root and maximal compressive stress on rake face are obtained. Results show that when the rake angle changes from the negative to the positive, chip thickness decreases and chip length increases, curvature radius of chip, cutting forces and maximal compressive stress at the interface between tool and chip decrease, and the cutting temperature near tool tip raises at the same time. However, the maximal strain near chip root keeps a constant. The rank angle of diamond tool should be selected reasonably according to the analysis.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2004年第9期1220-1223,1234,共5页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(50175022)
航天支撑技术基金资助项目(0223HIT07)
武器装备预研基金资助项目(51418020403HT0902).
