摘要
为了提高高速加工过程中薄壁结构件的加工精度,针对低刚度工艺系统的形变特点,建立了低刚度铣削工艺系统的弹性铣削力模型.该模型中基于弯扭剪耦合弹性力学理论,推导出了工件弹性铣削形变的解析式;并考虑到工件和铣刀的弹性形变共同引起铣削啮合角的变化,推导出啮合角的表达式.通过铣削力和铣削变形仿真以及铣削试验验证得知:铣削力与工件的铣削形变密切相关,工件的法向铣削分力是引起工件形变的主要因素.最后,经铣削力试验验证了实测结果和仿真结果具有较好的一致性.
To improve accuracy of the profile for flexible components during high speed milling,a model has been proposed showing the relationship between deflection of the low-rigidity processing system and the flexible milling force.Based on the bending-torsional-shearing coupled theory,a mathematical expression for static machining deflection prediction of thin-wall plate components has been determined,and the bending deflection and shear deflection which affect the dimension stability of the finished parts have been analyzed.The expression for modified cutting teeth immersion angle has also been introduced which takes into account the deflection of the workpiece and the cutter.Simulation and experiment results indicate that deflection of the low-rigidity workpiece is closely related to the milling force,and the predicted force in the normal direction is the major factor influencing the workpiece deflection.The proposed flexible force model has been experimentally validated and the results of the predicted and measured force values show good consistency.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2010年第2期143-148,共6页
Journal of Tianjin University(Science and Technology)
基金
国家高技术研究发展计划(863计划)资助项目(2008AA042406)
天津市自然科学基金重点资助项目(08JCZDJC18400)
天津市高校发展基金资助项目(20051002)
关键词
弹性铣削力
低刚度工件
形变预测
弯扭耦合
铣削加工
flexible milling force
low-rigidity component
deflection prediction
bending-torsional coupled theory
milling machine
