磁控散体抛光装置柔度调节机理研究
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摘要
为提高模具自由曲面的抛光效率,提出了一种磁控散体抛光装置,通过调节磁场强度,改变装置内铁磁散体间的磁吸力,从而实现抛光装置的柔度调节。基于莫尔-库伦破坏准则、磁偶极子、弹性力学等理论,推导出铁磁散体的非磁致抗剪能力和磁致抗剪能力的关系式,建立了铁磁散体在磁场作用下的抗剪能力模型(理想状态),并采用实验手段进行了理论模型的修正。研究表明,在磁场作用下,铁磁散体的抗剪能力由非磁致抗剪能力和磁致抗剪能力两部分组成,其中磁致抗剪能力与磁场强度、铁磁材料的体积等因素相关。
A new flexible free-form surface polishing device was proposed to improve polishing efficiency of mold free surface by changing magnetic field intensity to change the magnetic force between ferromagnetic granular in device,which can achieve the adjustable flexibility in real-time.The relationship between nonmagnetic induced shear capacity and the magnetic induced shear capacity of magnetron granular was established based on Mohr-Coulomb's failure criterion,magnetic dipole and elasticity theory.And the shear capacity model of ferromagnetic granular in an ideal state was also established.Through the analysis of experimental data,combined with shear capacity model,the shear force model of ferromagnetic granular can be obtained in the role of the magnetic field.The results show that in magnetic field,the shear capacity of ferromagnetic granular includes nonmagnetic induced shear capacity,anti-shearing force,magnetic induced shear capacity,and its anti-shearing force.The magnetic shear capacity and anti-shearing force is related to magnetic field and the volume of ferromagnetic materials.
A new flexible free-form surface polishing device was proposed to improve polishing efficiency of mold free surface by changing magnetic field intensity to change the magnetic force between ferromagnetic granular in device,which can achieve the adjustable flexibility in real-time.The relationship between nonmagnetic induced shear capacity and the magnetic induced shear capacity of magnetron granular was established based on Mohr-Coulomb's failure criterion,magnetic dipole and elasticity theory.And the shear capacity model of ferromagnetic granular in an ideal state was also established.Through the analysis of experimental data,combined with shear capacity model,the shear force model of ferromagnetic granular can be obtained in the role of the magnetic field.The results show that in magnetic field,the shear capacity of ferromagnetic granular includes nonmagnetic induced shear capacity,anti-shearing force,magnetic induced shear capacity,and its anti-shearing force.The magnetic shear capacity and anti-shearing force is related to magnetic field and the volume of ferromagnetic materials.
引文
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[2]Walker D D,Freeman R,McCavana G,et al.TheZeeko/UCL Process for Polishing Large Lenses andPrisms[J].Proceedings of SPIE-the InternationalSociety for Optical Engineering,2002,4411:106-111.
[3]高波,姚英学,谢大纲,等.气囊抛光工具的研制及特性测试[J].现代制造工程,2004(10):52-54.
[4]Ji Shi ming,Jin Mingsheng,Zhang Li,et al.Designof Spinning-inflated-gasbag Polishing Tool andIts Automated Systemfor Free-form Mould[J].WSEAS Transactions of System,2006,5(6):1448-1454.
[5]计时鸣,金明生,张宪,等.应用于模具自由曲面的新型气囊抛光技术[J].机械工程学报,2007,43(8):2-6.
[6]Childs T H C.Magnetic Fluid Grinding Mechanics[J].Wear,1994,75(9):189-198.
[7]Zhang B,Nakaji ma A.Dynamics of Magnetic FluidSupport Grinding of Si3N4Ceramic Ball for UltraPrecision Bearings and Its I mportant Ancein Spher-ical Surface Generation[J].Precision Engineering,2003,27:1-8.
[8]东南大学,浙江大学,湖南大学,等.土力学[M].北京:中国建筑工业出版社,2005.
[9]方生,龚兴龙,张先舟,等.磁流变弹性体力学性能的测试与分析[J].中国科学技术大学学报,2004,34(4):456-463.
[10]黄松元.散体力学[M].北京:机械工业出版社,1993.
[11]Shi mada K,Shuchi S,Kanno H.Magnetic Clusterand Its Applications[J].Journal of MagnetismandMagnetic Materials,2005,289:9-12.
[12]赵彭年.松散介质力学[M].北京:地震出版社,1995.
[13]Kusumoto Y,Nagata F,Watanabe K,et al.De-velopment of an Intelligent Sanding Machine forNew Designed Furniture—high Quality Sanding of3D Curved Surface Using Hyper Cutter LocationData[C]//Proceedings of the 16th Inter nationalWood Machining Seminar.Japan,2003:553-562.
[14]王永光,赵永武,吴燕玲,等.超精密抛光材料的非连续去除机理[J].中国机械工程,2007,18(9):1032-1035.
[15]袁楚明,张雷,陈幼平,等.机器人辅助模具自动抛光研究及发展趋势[J].中国机械工程,2000,11(12):1428-1430.
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