Material Removal Model and Numerical Analysis of Fluid Magnetic Abrasives Finishing

2008 ◽  
Vol 392-394 ◽  
pp. 45-49
Author(s):  
Huan Wu Sun ◽  
Shi Chun Yang
Keyword(s):  
Surface Roughness ◽  
Material Removal ◽  
Complex Shape ◽  
Removal Rate ◽  
New Type ◽  
Material Removal Model ◽  
Removal Model ◽  
Precision Finishing ◽  
Magnetic Abrasives ◽  
Key Parameter

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.

Development of a New Plate Polishing Technique with an Instantaneous Tiny-Grinding Wheel Cluster Based on Magnetorheological Effect

2008 ◽  
Vol 53-54 ◽  
pp. 155-160 ◽  
Author(s):  
Qiu Sheng Yan ◽  
Ai Jun Tang ◽  
Jia Bin Lu ◽  
Wei Qiang Gao
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Grinding Wheel ◽  
Abrasive Particles ◽  
Magnetorheological Effect ◽  
Material Removal Model ◽  
Mr Effect ◽  
Removal Model

A new plate polishing technique with an instantaneous tiny-grinding wheel cluster based on the magnetorheological (MR) effect is presented in this paper, and some experiments were conducted to prove its effectiveness and applicability. Under certain experimental condition, the material removal rate was improved by a factor of 20.84% as compared with the conventional polishing methods with dissociative abrasive particles, while the surface roughness of the workpiece was not obviously increased. Furthermore, the composite of the MR fluid was optimized to obtain the best polishing performance. On the basis of the experimental results, the material removal model of the new plate polishing technique was presented.

A Mechanistic Model of Material Removal in Magnetorheological Finishing (MRF)

2007 ◽  
Vol 359-360 ◽  
pp. 384-388
Author(s):  
Feng Jun Chen ◽  
Shao Hui Yin ◽  
Jian Wu Yu ◽  
Hitoshi Ohmori ◽  
Wei Min Lin ◽  
...  
Keyword(s):  
Material Removal Rate ◽  
Material Removal ◽  
Reynolds Equation ◽  
Removal Rate ◽  
Mechanistic Model ◽  
Magnetorheological Fluid ◽  
Magnetorheological Finishing ◽  
Material Removal Model ◽  
Removal Model ◽  
The Magnetic Field

According to the sharp rheological characteristics of magnetorheological fluid in the magnetic field, the principle and mechanism of magnetorheological finishing is analyzed. Based on the Preston equation, the Reynolds equation and its boundary conditions, the two-dimensional material removal model is built and simulated. Furthermore, a series of MRF experiments are carried out, and the influence of the immersed depth and material kinds on material removal rate are clarified respectively. The experimental results are compared with the modeling results of material removal rate to confirm the mechanistic model validity.

Material Removal Model and Experimental Verification for Abrasive Jet Precision Finishing with Wheel as Restraint

2006 ◽  
Vol 304-305 ◽  
pp. 555-559 ◽  
Author(s):  
Chang He Li ◽  
Guang Qi Cai ◽  
Shi Chao Xiu ◽  
Q. Li
Keyword(s):  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Experimental Results ◽  
Grinding Wheel ◽  
Rate Model ◽  
Material Removal Model ◽  
Material Removal Rate Model ◽  
Three Body ◽  
Precision Finishing

The material removal rate (MRR) model was investigated in abrasive jet precision finishing (AJPF) with wheel as restraint. When abrasive wore and workpiece surface micro-protrusion removed, the size ratio for characteristic particle size to minimum film thickness gradually diminishing, the abrasive machining from two-body lapping to three-body polishing transition in AJPF with grinding wheel as restraint. In the study, the material removal rate model was established according to machining mechanisms and machining modes from two-body to three-body process transition condition, and active number of particles in grinding zone were calculated and simulated. Experiments were performed in the plane grinder for material removal mechanism and academic models verification. It can be observed from experimental results that the surface morphology change dramatically to a grooved or micro-machined surface with all the grooves aligned in the sliding direction in two-body lapping mode. On the other hand, the surface is very different, consists of a random machining pits with very little sign of any directionality to the deformation in the three-body machining mode. Furthermore, the material removal rate model was found to give a good description of the experimental results.

Manufacturing of Mini-Channel by Electrical Chemical Machining Processes

2016 ◽  
Vol 842 ◽  
pp. 111-114
Author(s):  
Muslim Mahardika ◽  
Agung Mulianto ◽  
Andi Sudiarso
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
Manufacturing Industry ◽  
Complex Shape ◽  
Electrolyte Concentration ◽  
Removal Rate ◽  
Hard Material ◽  
Machining Processes ◽  
Conventional Machining

The manufacturing industry is now growing rapidly in the area of non-conventional machining, especially Electrical Chemical Machining (ECM). The ECM can be used for machining of very hard material and very complex shape. This research is performed in order to manufacture mini-channel, which has a complex shape. The ECM machine cutting conditions are as follow; voltage: 7 Volt, feed rate: 1 .0 mm/minute, electrolyte: Natrium Cloride (NaCl), electrolyte concentration: 15 %, electrolyte speed: 3.32 m/s. The result shows that the mini-channel can be manufactured with the average of Material Removal Rate 0.035 g/min with the overcut average is 0.481 mm, and the surface roughness is 5.19 micro meter.

Study of Local Material Removal Model of Bonnet Tool Polishing

2006 ◽  
Vol 304-305 ◽  
pp. 335-339 ◽  
Author(s):  
Da Gang Xie ◽  
B. Gao ◽  
Ying Xue Yao ◽  
Zhe Jun Yuan
Keyword(s):  
Material Removal ◽  
Dwell Time ◽  
Removal Rate ◽  
Rate Model ◽  
Polishing Process ◽  
Flexible Membrane ◽  
Local Material ◽  
Internal Fluid ◽  
Material Removal Model ◽  
Removal Model

Bonnet tool polishing is a novel aspherical polishing method. This paper describes a method to obtain the local removal rate for the polishing process using bulbous flexible membrane covered with a polishing pad and pressurized by an internal fluid. According to the principle of bonnet polishing and Preston equation, the local removal rate model was established. It is confirmed by the experiments that the local removal depth has a linear relation with the dwell time. Preston coefficient can be calculated from the experimental data. Finally the expression of the local removal rate in bonnet tool polishing is acquired semi-empirically.

Study on the Rheological Effect Models of Fluid Magnetic Abrasive

2009 ◽  
Vol 416 ◽  
pp. 54-60
Author(s):  
Huan Wu Sun ◽  
Shi Chun Yang
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Surface Roughness ◽  
Experimental Results ◽  
Transition Phenomenon ◽  
New Type ◽  
Rheological Effect ◽  
First Time ◽  
Precision Finishing ◽  
Magnetic Abrasives

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.

Influence of Abrasive on Planarization Polishing with the Tiny-Grinding Wheel Cluster Based on the Magnetorheological Effect

2009 ◽  
Vol 76-78 ◽  
pp. 229-234 ◽  
Author(s):  
Qiu Sheng Yan ◽  
Yong Yang ◽  
Jia Bin Lu ◽  
Wei Qiang Gao
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Material Removal Rate ◽  
Material Removal ◽  
Magnetic Particles ◽  
Optical Glass ◽  
Removal Rate ◽  
Grinding Wheel ◽  
Material Particle ◽  
Material Removal Model

Experiments were conducted to polish optical glass with the magnetorheological (MR) effect-based tiny-grinding wheel cluster, and the influences of abrasive material, particle size and content on the material removal rate and surface roughness are investigated. The experimental results indicate that: the higher the hardness of abrasives, the higher the material removal rate, but the abrasives with lower hardness can obtain lower surface roughness. The better polishing quality of the workpiece can be obtained when the particle size of abrasives is similar to the particle size of magnetic particles. Moreover, the content of abrasives has an optimum value, and the material removal rate and the surface quality can not be improved further when the content of abrasives exceeds the optimum value. On the basis of above, the material removal model of the new planarization polishing technique is presented.

Research on Material Removal of Magnetorheological Finishing

2007 ◽  
Vol 329 ◽  
pp. 285-290
Author(s):  
Gui Wen Kang ◽  
Fei Hu Zhang
Keyword(s):  
Material Removal ◽  
Removal Rate ◽  
Mathematic Model ◽  
Magnetorheological Finishing ◽  
Fixed Rate ◽  
Hydrodynamic Analysis ◽  
Finishing Process ◽  
Material Removal Model ◽  
Removal Model ◽  
Surface Figure

Magnetorheological finishing (MRF) is a novel precision optical machining technology. Owing to its flexible finishing process, MRF can eliminate subsurface damage, smooth rms micro roughness and correct surface figure errors. The finishing process can be easily controlled by a computer. Material removal model in MRF is established. According to Preston equation in optical machining, mathematic model of material removal rate in MRF rotating at fixed rate is established through hydrodynamic analysis of the MR fluid flow in the polishing zone. The validity of the model is examined by the experimental results.

Improving the Sediment Stability of Fluid Magnetic Abrasives Based on Nanometer SiO2

2010 ◽  
Vol 135 ◽  
pp. 159-163
Author(s):  
Huan Wu Sun ◽  
Wei Yi Chen
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Surface Roughness ◽  
Preparation Method ◽  
Sediment Stability ◽  
New Type ◽  
The Stability ◽  
Nanometer Sio2 ◽  
Precision Finishing ◽  
Magnetic Abrasives

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.

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