An Online Active Balancing Method Using Magnetorheological Effect of Magnetic Fluid

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Xining Zhang ◽  
Xinrui Xia ◽  
Zhou Xiang ◽  
Yanan You ◽  
Bing Li
Keyword(s):  
Magnetic Field ◽  
Machine Tool ◽  
Magnetic Fluid ◽  
Three Dimensional ◽  
Surface Shape ◽  
Local Magnetic Field ◽  
Work Piece ◽  
Active Balancing ◽  
Machine Tool Spindle ◽  
Mr Effect

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. Three-dimensional (3D) 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 rotation speed is established. Also, the performance of the balancing device is further proved in experiments conducted on the experimental platform. The imbalance vibration amplitude of the test spindle decreased by an average of 87.9% indicates that the proposed active balancing method in this paper is promising.

Realization of Real-Time Balancing of a Machine Tool Spindle Using Magnetic Fluid

2010 ◽  
Vol 4 (6) ◽  
pp. 518-523
Author(s):  
Keiichi Nakamoto ◽  
◽  
Hidenori Nakatsuji ◽  
Shinya Mitsuhashi ◽  
Keiichi Shirase ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Machine Tool ◽  
Real Time ◽  
Magnetic Fluid ◽  
Colloidal Suspension ◽  
Machined Surface ◽  
Tool Vibration ◽  
Mass Imbalance ◽  
Machine Tool Spindle ◽  
Machining Operations

Tool vibration shortens tool life and lowers the quality of the machined surface. Even a small mass imbalance in the spindle and tooling generates tool vibration. Additionally, in machining operations, different tooling setups including the cutting tools rotate at different speeds for each machining operation, making it difficult to reduce tool vibration. In order to solve the problem, real-time balancing using magnetic fluid was proposed in our previous study. Magnetic fluid is a type of smart fluid comprised of a stable colloidal suspension of magnetic nanoparticles in a liquid carrier, and its viscosity and behavior are precisely controlled by changes in magnetic field intensity. To compensate for the mass imbalance of a spindle and tooling in real-time, the magnetic fluid enclosed inside the spindle is controlled to alter the distribution of circumferential mass by adjustments in the intensity of the magnetic field made from outside the spindle. Thus, tool vibration, which changes frequently depending on tooling during various machining operations, can be reduced successfully. In this paper, a machine tool spindle with the proposed real-time balancing is developed, and several experiments are conducted. It is confirmed that the mass imbalance in the entire rotating system is significantly reduced in real-time, and tool vibration is effectively suppressed as well.

scholarly journals Three-Dimensional Magnetic Fluid Boundary Layer Flow Over a Linearly Stretching Sheet

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
E. E. Tzirtzilakis ◽  
N. G. Kafoussias
Keyword(s):  
Magnetic Field ◽  
Boundary Layer ◽  
Magnetic Fluid ◽  
Boundary Layer Flow ◽  
Stretching Sheet ◽  
Numerical Technique ◽  
Three Dimensional ◽  
Magnetic Interaction ◽  
Layer Flow ◽  
The Magnetic Field

The three-dimensional laminar and steady boundary layer flow of an electrically nonconducting and incompressible magnetic fluid, with low Curie temperature and moderate saturation magnetization, over an elastic stretching sheet, is numerically studied. The fluid is subject to the magnetic field generated by an infinitely long, straight wire, carrying an electric current. The magnetic fluid far from the surface is at rest and at temperature greater of that of the sheet. It is also assumed that the magnetization of the fluid varies with the magnetic field strength H and the temperature T. The numerical solution of the coupled and nonlinear system of ordinary differential equations, resulting after the introduction of appropriate nondimensional variables, with its boundary conditions, describing the problem under consideration, is obtained by an efficient numerical technique based on the common finite difference method. Numerical calculations are carried out for the case of a representative water-based magnetic fluid and for specific values of the dimensionless parameters entering into the problem, and the obtained results are presented graphically for these values of the parameters. The analysis of these results showed that there is an interaction between the motions of the fluid, which are induced by the stretching surface and by the action of the magnetic field, and the flow field is noticeably affected by the variations in the magnetic interaction parameter β. The important results of the present analysis are summarized in Sec. 6.

3405 A Study on Machine Tool Spindle Using Magnetic Fluid for Realizing Real-Time Balancing

2008 ◽  
Vol 2008.4 (0) ◽  
pp. 253-254
Author(s):  
Keiichi NAKAMOTO ◽  
Satoshi HORII ◽  
Kazuhiko ADACHI ◽  
Keiichi SHIRASE
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Magnetic Fluid ◽  
Machine Tool Spindle

S1301-2-2 A Study on a Machine Tool Spindle Using Magnetic Fluid for Realizing Real-Time Balancing

2009 ◽  
Vol 2009.4 (0) ◽  
pp. 235-236
Author(s):  
Shinya MITSUHASHI ◽  
Keiichi NAKAMOTO ◽  
Kazuhiko ADACHI ◽  
Keiichi SHIRASE
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Magnetic Fluid ◽  
Machine Tool Spindle

A Study on Mathematical Modeling Technology for Magnetic-Fluid Grinding

2011 ◽  
Vol 335-336 ◽  
pp. 406-410
Author(s):  
Shu Qin Wu ◽  
Yao Ming Li
Keyword(s):  
Mathematical Modeling ◽  
Magnetic Field ◽  
Magnetic Fluid ◽  
Work Piece ◽  
Technological Parameters ◽  
Si3n4 Ceramic ◽  
Working Mechanism ◽  
Modeling Technology ◽  
Magnetic Center ◽  
Grinding Time

The paper introduces the precision processing technology of grinding using magnetic fluid and presents the working mechanism of magnetic-fluid grinding. Based on Preston Equation, it also establishes a mathematical modeling for magnetic-fluid grinding, which is used to study the relationships between the effects of grinding and the variation of such technological parameters as the revolving speed of work-piece, the intensity of magnetic field, the distance between work-piece surface and magnetic center, the size of the magnetic fluid and grinding time, etc. Analysis on the grinding of Si3N4 ceramic-balls proves that the model has been well established.

Modeling of the Dynamic Surface Profile in Magnetic Fluid Mirrors

2006 ◽  
Author(s):  
Azhar Iqbal ◽  
Foued Ben Amara
Keyword(s):  
Magnetic Field ◽  
Dynamic Response ◽  
Magnetic Fluid ◽  
Retinal Imaging ◽  
Surface Shape ◽  
Effective Control ◽  
Control Input ◽  
Mirror Surface ◽  
Dynamic Surface ◽  
Imaging Application

Magnetic fluid deformable mirrors (MFDMs) present a simple alternative to the expensive and delicate wavefront correctors currently in use in adaptive optics (AO) systems. Such mirrors are particularly suitable for retinal imaging AO systems. The practical implementation of a retinal imaging AO system incorporating a MFDM requires an effective control system to control the shape of the mirror surface. The real-time control of the mirror surface requires a model of the mirror that can be used to determine the dynamic response of the mirror to a magnetic field applied as the control input. This paper presents such a model that not only determines the dynamic response of the MFDM but also takes into account the unique requirements of the retinal imaging application of the mirrors. The mirror is modeled as a horizontal layer of a magnetic fluid. The dynamic response of the mirror to the applied magnetic field is represented by the deflection of the free surface of the layer. The surface deflection is determined by the modal analysis of the coupled fluid-magnetic system. Considering the requirements of the retinal imaging application, the effects of surface tension and depth of the fluid layer are duly represented in the model. The mirror model is described in a state-space form and can be readily used in the design of a controller to regulate the mirror surface shape.

Multipoint Constraints for Modeling of Machine Tool Dynamics

2015 ◽  
Vol 138 (5) ◽  
Author(s):  
Christian Brecher ◽  
Marcel Fey ◽  
Christian Tenbrock ◽  
Matthias Daniels
Keyword(s):  
Machine Tool ◽  
Dynamic Properties ◽  
Three Dimensional ◽  
Ball Screw ◽  
Work Piece ◽  
Structural Components ◽  
Model Quality ◽  
Constraint Equations ◽  
Improve Model ◽  
Insight Into

The dynamic properties of machine tools are frequently calculated by means of finite-element (FE) models. Usually, in a first step, the structural components, such as machine bed, slides, columns, spindle housing, spindle, and work piece, are meshed. In a second step, these components are positioned relatively to each other and are connected by joints. Usually, the joints comprise a three-dimensional spring–damper element (SDE) and constraints that connect the SDE to adjacent structural components. Commercial FE programs do rarely offer insight into the underlying constraint equations. Rather, the constraints are realized by selecting the faces or nodes to connect and the type of constraint over a graphical user interface. Moreover, when insight into the underlying equations is offered, it is normally difficult to implement user-defined constraint equations. So far, literature lacks a coherent and in-depth description of constraints that are used for assembly of machine tool FE components. This drawback is addressed here. Different common constraints are revisited while particular focus is put on simulating moving machine axes. Common multipoint constraints (MPC) are supplemented by a shape function based node weighting. Thus, two new MPC are introduced, which improve model quality for ball screw joints (named node-to-beam (NB)-constraint) and linear guides (named RBE4-constraint). A three-axis milling machine serves as an application example for the different constraints. Simulation results are compared to experimentally derived results. Both, frequency response functions (FRF) and time-domain forced responses are considered. Showing reasonable correlation, the comparison of simulation and experiment indicates the validity of the constraints that have been introduced.

scholarly journals Real-Time Balancing Mechanism Using Magnetic Fluid for a Machine Tool Spindle (2nd Report)

2010 ◽  
Vol 76 (11) ◽  
pp. 1271-1275 ◽  
Author(s):  
Keiichi NAKAMOTO ◽  
Shinya MITSUHASHI ◽  
Hidenori NAKATSUJI ◽  
Keiichi SHIRASE
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Magnetic Fluid ◽  
Machine Tool Spindle

Congratulations! Best Paper Award 2010

2010 ◽  
Vol 4 (5) ◽  
pp. 411-411
Author(s):  
Editorial Office
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Magnetic Fluid ◽  
Selection Process ◽  
Paper Award ◽  
Award Winner ◽  
Award Ceremony ◽  
Machine Tool Spindle

The first Best Paper Award ceremony was held in Kasumigaseki, Tokyo, Japan, on July 23, attended by authors and IJAT committee members who took part in the selection process for IJAT, Vol.3 (2009). The award winner(s) will also be announced on the IJAT website and given a certificate and a nearly US$1,000 honorarium. The Best Paper Award 2010 is as follows: Title: A Machine Tool Spindle Achieving Real-Time Balancing Using Magnetic Fluid Authors: Keiichi Nakamoto, Shinya Mitsuhashi, Kazuhiko Adachi, and Keiichi Shirase IJAT, Vol.3 No.2, pp. 193-198, March 2009

Characteristic Parameters of a Tuned Magnetic Fluid Damper Under Magnetic Fields

2007 ◽  
Author(s):  
Ken-Ichi Ohno ◽  
Manabu Shimoda ◽  
Tatsuo Sawada
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Magnetic Fluids ◽  
Tuned Mass Damper ◽  
Surface Shape ◽  
Cylindrical Container ◽  
Characteristic Parameters ◽  
Frequency Responses ◽  
Fluid Damper ◽  
Mass Damper

Damping parameters of a tuned magnetic fluid damper [TMFD] using a tuned mass damper [TMD] analogy model are obtained from approximation to frequency responses of experiments used some sort of magnetic fluids in a cylindrical container. An effective mass is changed by a magnetic field from downside, however a significant change of surface shape of magnetic fluids causes strange changing tendency. It was found that other parameters are changed according to the surface shape.

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