In order to improve the efficiency and capability of ultrasonic machining system, the design method of Giant magnetostrictive ultrasonic machining systems (GMUMS) is presented and the influence of magnetic material for the closed magnetic circuit on the vibration performance is studied. Three kinds of magnetic materials, including silicon steel, ferrite and magnetic powder core, are applied and the equivalent circuit is proposed. Based on impedance analysis method, the impedance circle is plotted to determine the resonant frequency and electromechanical conversion coefficient so that the rule of magnetic material properties and electromechanical conversion coefficient can be put forward. To verify the impedance analysis results, the relation of amplitude-current sensitivity and excitation frequency under four excitation voltage levels is established and the optimization selection method of the magnetic material for different power-capability ultrasonic system is proposed. The results reveal that a low-power GMUMS can generate a higher electromechanical conversion coefficient by using high permeability ferrite material, while the magnetic powder core with higher saturation magnetic flux density is well-suited for high-power GMUMS due to the influence of both the permeability and saturation magnetic flux density on the vibration performance. It is useful in choosing magnetic materials for the GMUMS with different levels of power.
CAI Wanchong
,
ZHANG Jianfu
,
YU Dingwen
,
WU Zhijun
,
FENG Pingfa
. Research on the Electromechanical Conversion Efficiency for Giant Magnetostrictive Ultrasonic Machining System[J]. Journal of Mechanical Engineering, 2017
, 53(19)
: 52
-58
.
DOI: 10.3901/JME.2017.19.052
[1] WAN Y,LIN B,WANG S,et al. Study on the system matching of ultrasonic vibration assisted grinding for hard and brittle materials processing[J]. International Journal of Machine Tools and Manufacture,2014,77:66-73.
[2] ZHU Y,JI L. Theoretical and experimental investigations of the temperature and thermal deformation of a giant magnetostrictive actuator[J]. Sensors and Actuators A,2014,218:167-178.
[3] JIN K,KOU Y,ZHENG X. The resonance frequency shift characteristic of Terfenol-D rods for magnetostrictive actuators[J]. Smart Materials and Structures,2012,21(4):1-7.
[4] CHEN C,SHI Y L,ZHANG J,et al. Novel linear piezoelectric motor for precision position stage[J]. Chinese Journal of Mechanical Engineering,2016,29(2):378-385.
[5] 袁惠群,李莹,李东,等. 超磁致伸缩微致动器车削系统建模与控制[J]. 振动. 测试与诊断,2014,34(2):351-355. YUAN Huiqun,LI Ying,LI Dong,et al. Modelling and control for giant magnetostrictive micro-actuator turning system[J]. Journal of Vibration,Measurement & Diagnosis,2014,34(2):351-355.
[6] CAI W C,FENG P F,ZHANG J F,et al. Effect of temperature on the performance of a giant magnetostrictive ultrasonic transducer[J]. Journal of Vibroengineering,2016,18(2).
[7] 薛光明,张培林,何忠波,等. 喷油器用超磁致伸缩致动器多自由度模型[J]. 机械工程学报,2015,51(24):97-104. XUE Guangming,ZHANG Peilin,HE Zhongbo,et al. Multiple degrees of freedom model of giant magnetostrictive actuator used on high-pressure-common-rail injector[J]. Journal of Mechanical Engineering,2015,51(24):97-104.
[8] 李明范,项占琴,吕福在. 超磁致伸缩换能器磁路设计及优化[J]. 浙江大学学报,2006,40(2):192-196. LI Mingfan,XIANG Zhangqin,LÜ Fuzai. Magnet circuit design and optimization of giant magnetostrictive transducer[J]. Journal of Zhejiang University,2006,40(2):192-196.
[9] 曾庚鑫. 超磁致伸缩功率超声换能器理论分析与试验研究[D]. 广州:华南理工大学,2013. ZENG Gengxin. Theoretical analysis and experimental study of the giant magnetostrictive power ultrasonic transducer[D]. Guangzhou:South China University of Technology,2013.
[10] WAKIWAKA H,UMEZAWA T,YAMADA H,et al. Improvement of flux density uniformity in giant magnetostrictive material for acoustic vibration element[J]. IEEE Transactions on Magnetics,1993,29(6):2443-2445.
[11] WOOLLETT R S. Effective coupling factor of single degree of freedom transducers[J]. Journal of the Acoustical Society of America,1966,40:1112-1123.
[12] WAKIWAKA H,LIO M,NAGUMO M,et al. Impedance analysis of acoustic vibration element using giant magnetorestrictive material[J]. IEEE Transactions on Magnetics,1992,28(5):2208-2210.
[13] HE X, ZHANG P. A new calculation method for the number of radial slots of a Terfenol rod[J]. Science in China Series E:Technological Sciences,2009,52(2):336-338.
[14] BOMBA J,KALETA J,SAWA P. An initial investigation into change in magnetomechanical properties of terfenol-d rod due to prestress and temperature[J]. Anyagvizsgalok Lapja,2004(1):19-21.
