超精密飞切机床结合面虚拟材料法建模及模态优化
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摘要
在超精密飞切加工中,机床自身的动态特性是引起加工表面微波纹的主导因素。为探究超精密金刚石飞切机床的动态特性及其对加工表面微波纹的影响机理,将虚拟材料法的结合面建模方法引入整机动力学模型中。进一步地,利用有限元分析软件进行整机的模态分析及优化。结果表明:相较于传统的弹簧-阻尼模型,该模型具有更高的综合精度。同时模态分析表明,机床固有频率为268 Hz的第五阶模态对加工尤为敏感,而通过适当增加结合面的结合刚度,可优化机床模态进而消除波纹提高表面质量。
In the ultra-precision flycutting,the dynamic performance of the machine tool is the main factor that leads the waviness error on the machined surface. In order to explore the dynamic performance of ultraprecision diamond flycutting machine tool and its influence mechanism on the waviness of the machined surface,the virtual material modeling method was introduced into the whole machine tool. Subsequently,the modal analysis and optimization of the machine tool were carried out by using the finite element analysis software. The results indicate that the virtual material model has higher comprehensive precision than the traditional spring-damper model. Moreover,the modal analysis shows that the fifth mode of the machine tool with natural frequency of 268 Hz is particularly sensitive to processing. By increasing the joint stiffness,the modal of the whole machine tool would could be optimized,so that the surface quality can be improved by eliminating the waviness.
In the ultra-precision flycutting,the dynamic performance of the machine tool is the main factor that leads the waviness error on the machined surface. In order to explore the dynamic performance of ultraprecision diamond flycutting machine tool and its influence mechanism on the waviness of the machined surface,the virtual material modeling method was introduced into the whole machine tool. Subsequently,the modal analysis and optimization of the machine tool were carried out by using the finite element analysis software. The results indicate that the virtual material model has higher comprehensive precision than the traditional spring-damper model. Moreover,the modal analysis shows that the fifth mode of the machine tool with natural frequency of 268 Hz is particularly sensitive to processing. By increasing the joint stiffness,the modal of the whole machine tool would could be optimized,so that the surface quality can be improved by eliminating the waviness.
引文
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[2]郭晓光,刘子源,郑桂林,等.KDP晶体三倍频晶面微观力学行为及加工性能[J].光学精密工程,2016,24(2):398-405.
[3]杨旭,安晨辉,孙郅佶,等.基于机床动态特性的超精密飞切加工表面波纹机理解析[J].振动与冲击,2016,35(18):196-202.
[4]张剑锋,苏文虎,张利平.超精密飞切加工表面微波纹分析研究[J].机械工程师,2016(8):271-273.
[5]Ren Y,Beards C F.Identification of‘effective’linear joints using coupling and joint identification techniques[J].Journal of Vibration and A-coustics,1998,120(2),331-338.
[6]Yuji Furukawa,Nobuyuki Moronuki.Contact deformation of a machine tool slideway and its effect on machining accuracy[J].Transactions of the Japan Society of Mechanical Engineers Series C,1987,53(485):228-234.
[7]位文明,刘海涛,张俊,等.基于实际面压力分布的结合面有限元建模方法[J].中国科技论文在线,2011,6(8):563-567.
[8]Hamid Ahmadian,John E Mottershead,Simon James,et al.Modelling and updating of large surface-to-surface joints in the AWE-MACEstructure[J].Mechanical Systems and Signal Processing,2006,20(4):868-880.
[9]范世荣,张学良,温淑花,等.基于各向同性虚拟材料的固定结合面修正模型[J].太原科技大学学报,2017,38(4):302-306.
[10]Tian Hongliang,Li Bin,Liu Hongqi,et al.A new method of virtual material hypothesis-based dynamic modeling on fixed joint interface in machine tools[J].International Journal of Machine Tools and Manufacture,2011,51(3):239-249.
[11]田红亮,刘芙蓉,方子帆,等.引入各向同性虚拟材料的固定结合部模型[J].振动工程学报,2013,26(4):561-573.