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research-article

An Online Active Balancing Method Using Magnetorheological Effect of Magnetic Fluid

[+] Author and Article Information
Xining Zhang

State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an 710049, China
zhangxining@mail.xjtu.edu.cn

Xinrui Xia

State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an 710049, China
xiaxinrui2@gmail.com

Zhou Xiang

State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an 710049, China
530969941@qq.com

Yanan You

State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an 710049, China
1479394566@qq.com

Bing Li

State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an 710049, China
lbtv.xjtu@stu.xjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040675 History: Received October 20, 2017; Revised June 22, 2018

Abstract

The improvement of machining efficiency and precision puts forward new requirements for the balancing performance of machine tool spindle. Work piece quality can be effectively improved by implementing the active balance on the spindle. In this paper, a new active balancing method using magnetorheological (MR) effect of magnetic fluid is proposed. The mechanism of forming compensation mass by changing the distribution of magnetic fluid under local magnetic field is expounded. Experiments are carried out to verify the feasibility of the proposed method. Profile lines of magnetic fluid surface shape at different positions are measured with linear laser projection measurement method in experiments. The surface shape of the magnetic fluid is reconstructed by the synthesis of the measured profile lines. Experiments demonstrate that mass center of the magnetic fluid increases with the strength of magnetic field. Thus the feasibility of the proposed method is verified experimentally. In order to weaken the vibration of machine tool spindle using this method, a balancing device is designed, which includes magnetic fluid chambers and three conjugated C-type electromagnets arranged at 120 deg. intervals. For each electromagnet, the relationship among compensation mass (the corresponding balancing mass), excitation current and rotating speed is established. Also, the performance of the balancing device is further proved in experiments conducted on the experimental platform. The unbalance vibration amplitude of the test spindle decreased by an average of 87.9 %, which indicates the proposed active balancing method in this paper is promising.

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