球头铣刀铣削加工过程的动力学建模及仿真.pdf

浙江工业大学硕士学位论文球头铣刀铣削加工过程的动力学建模及仿真姓名:孙孟琴申请学位级别:硕士专业:机械制造及其自动化指导教师:翁泽宇 20060401 浙江工业大学硕士学位论文球头铣刀铣削加工过程的动力学建模及仿真摘要本文以球头铣刀几何参数、金属切削原理、机床动力学、系统辨识和模态分析理论为基础,对螺旋刃球头铣刀的铣削力模型进行研究与改进,并基于Matlab环境下,采用数值仿真技术,对螺旋刃球头铣刀的动态铣削过程的铣削力与铣削振动进行建模,实现在时域内直接对铣削过程的仿真,并分析铣削参变量对铣削振动的影响,以及铣削加工过程的稳定性。本文具体内容: ,通过对球头铣刀几何参数的分析,建立了球头铣刀的瞬时铣削力的微元模型及铣削力模型,并给出球头铣刀铣削力模型的仿真系统。 、金属切削原理的基本规律,把机床一***一工件简化为质量块、阻尼器、弹簧的等效模型, 建立了两个相互垂直振动方向的球头铣刀铣削系统动力学模型。 ***一工件系统,采用脉冲锤击激振测试法,得到频响函数曲线。依据频率响应函数与模态参数的关系,采用半功率带宽法与分量分析法对球头铣刀铣削系统进行模态参数识别。 ,采用变步长四阶龙格一库塔算法,求解本文提出的球头铣刀铣削加工动力学方程,给出了球头铣刀铣削加工的仿真系统。浙江工业大学硕士学位论文 ,依据系统参数、仿真参数,用龙格一库塔法对球头铣刀不同铣削加工参数(每齿进给量、主轴转速、铣削深度等) 下的铣削加工过程进行了仿真,同时对稳定性及自激振动也进行了仿真,分析了铣削过程中铣削参数对铣削振动及稳定性的影响。关键词:球头铣刀,铣削力建模,实验模态参数辨识,仿真浙江工业大学硕士学位论文 ON THE DYNAMIC S OF THE MILLING 0F BALL END MILLING:MODELn町G OF CUTTING FORCES AND SIMULATl0N AB STRACT This paper presents adynamic forcemodel and astability forthe ballend milling,based differential geometry parameters,metal cutting theory andmachine tool,vibration measuring,testing and Matlabsystem isemployed tosolvethedifferentialequations governing the dynamics ofthe ballend milling system for accurate model,using puter simulation can present thetime domain chattermodel represented by thetool-work displacements and cutting forcevariations against curer time domain simulation forthemilling ofthe ball end milling with theanalytical predictions shows thattheproposed result is capable of accurate prediction of main content may besummarized asfollows: paper presents the ballendmilling forcemodal with asingle—point incontinuous cutting force and thesimulation system ofthecutting 浙江工业大学硕士学位论文 forceoftheballendmilling,basing on themechanics ofmilling andthe ballgeometry model. dynamics model ofthemilling ballendmilling isassumed tobe a system withtwo modes intwomutually perpendicular directions,using the mechanics ofthe self-excited vibration,mechanics ofthe