Fluid Magnetic Abrasives Research Articles

Experimental study on polishing of fluid magnetic abrasives for the wire electrical discharge grinding surface of micro-shafts

Experimental study on polishing of fluid magnetic abrasives for the wire electrical discharge grinding surface of micro-shafts

Characterizing acoustic emission signals for the online monitoring of a fluid magnetic abrasives finishing process

To implement an automated fluid magnetic abrasive finishing process, an online monitoring scheme is proposed based on characterizing acoustic emission signals in this paper. According to the material removal mechanisms during the fluid magnetic abrasive finishing process, the acoustic emission generation and characteristics are predicted analytically to be dominated by the interactions between the surface asperities and the abrasive particles. Moreover, the interactions and corresponding acoustic emission events will become weaker as the finishing process progresses and the surface becomes smoother. Experimental studies show that the amplitude and the occurrence rate of continuous acoustic emission waves and intermediate bursts reduce gradually with the progression of the finishing process. Based on these features, root mean squared values and burst occurrence rates, being of the lowest computational requirements, are suggested as online monitoring parameters for an automated and intelligent finishing in fluid magnetic abrasive manufacturing. The proposed method is verified experimentally, showing that the root mean squared values are highly consistent with the measured surface roughness values, which confirms the dynamic mechanisms between the fluid magnetic abrasive finishing and acoustic emission generation sources examined.

The Experiment Research on the Fluid Magnetic Abrasives

The fluid magnetic abrasive (FMA) is a new type of intelligent material. The fluid magnetic abrasive (FMA) has typical liquid characteristics, when there is no external magnetic field around it. But when a strong magnetic field is applied, the viscosity of it will increase more than 100 times within a few milliseconds, and it will show the characteristics those are resemble to solid's. We call this feature as rheological property, of which because the workpiece can be finished by fluid magnetic abrasive (FMA). On base of researching on the micro-structure of fluid magnetic abrasive (FMA), the experiments and results are presented in this paper.

The Role of Nanometer Silicon Dioxide in the Modification of Fluid Magnetic Abrasive

The fluid magnetic abrasive (FMA) is a new type of precision finishing abrasives which is a sort of suspended fluid composed by magnetic particles, nonmagnetic abrasive particles, surfactants in a non-magnetizable carrier liquid. This paper is to solve the contradiction of disperser stability by adding the surface active agent (dispersing agent), the nano- particles etc.

Research on the Finishing Mechanism of Fluid Magnetic Abrasives

The fluid magnetic abrasive (FMA) is a new type of precision finishing abrasives. The workpiece can be finished by fluid magnetic abrasive (FMA) because of its rheological property. On base of researching on the micro-structure of fluid magnetic abrasive (FMA), this paper analyzed the finishing mechanism. And the experiments and results are presented as well in this paper.

Improving the Sediment Stability of Fluid Magnetic Abrasives Based on Nanometer SiO<sub>2</sub>

The fluid magnetic abrasives (FMA) are a new type of precision finishing abrasives which are developed on the basis of the phase transition phenomenon caused by magnetic field. The sediment stability and agglomerative stability are significant characteristics of FMA, and have a great impact on the finishing capabilities and the final surface roughness value. In order to improve the stability of FMA, a new ingredient based on nanometer SiO2 is proposed, the preparation method and the experimental results are also discussed in this paper.

Study on the Fluid Magnetic Abrasive Polishing Technology

Fluid magnetic abrasive (FMA) is a new precision finishing process. It has the capability of processing free shape surfaces and complex cavities. Due to its strong adjustability and controllability, FMA could be regarded as the final process of machining which could greatly improve the surface quality of workpiece. The paper first introduces the component and machining mechanism of FMA, secondly it describes the model of the material removal in the process, thirdly it presents the devices of FMA polishing. At the end, a grinding head tool based machining mode is proposed for realizing the polishing of internal cavity.

Study on the Rheological Effect Models of Fluid Magnetic Abrasive

The fluid magnetic abrasives (FMA) are a new type of precision finishing abrasives which are developed on the basis of the phase transition phenomenon caused by magnetic field. The rheological effect of FMA is the basis to achieve its finishing function, and has a great impact on the finishing capabilities and the final surface roughness. In order to get a better understanding of FMA finishing mechanism, the rheological effect models of FMA are deduced for the first time, the simulations and the experimental results are discussed as well in this paper.

Material Removal Model and Numerical Analysis of Fluid Magnetic Abrasives Finishing

The fluid magnetic abrasives (FMA) are a new type of precision finishing abrasives, which can be used to finish the work-pieces with intricate or complex shape to a quite low surface roughness value. As a key parameter, the material removal rate has a great impact on the finishing capabilities and the final surface roughness. In order to get a better understand of FMA removal mechanism, the numerical analyses was used to simulate the shearing stress field and velocity distribution. The experimental results are discussed as well in this paper.

Study on the Magnetic Saturation Flux Density Measurement of Fluid Magnetic Abrasives

The fluid magnetic abrasives (FMA) are a new type of precision finishing abrasives, which can be used to finish the parts with intricate or complex shape to a quite low surface roughness value. As a key parameter, the magnetic saturation flux density has a great impact on the design of finishing devices and the control of finishing process. In order to measure the magnetic flux density and determine the magnetization curve of FMA, a new apparatus has been developed. The measuring mechanism and the experimental apparatus are presented. The experimental results are discussed as well in this paper.

Study on the finishing mechanism of fluid magnetic abrasive

The Fluid Magnetic Abrasive (FMA) is a new type of precision finishing abrasives that has the capability of processing complex part to a quite low surface roughness. The microscopic and macroscopic finishing mechanism of FMA is investigated in this paper for the first time. A process model is derived to elucidate the mechanism and material removal rate in FMA and some key parameters in finishing process that may affect the finishing efficiency and the final surface roughness are analysed theoretically. The experimental results are also discussed in this paper.