Influences of Polishing Tool’s Shape on Surface Roughness in Magneto-Rheological Finishing

2010 ◽  
Vol 97-101 ◽  
pp. 4092-4095 ◽  
Author(s):  
Shao Hui Yin ◽  
Ke Jun Zhu ◽  
Yu Feng Fan ◽  
Yong Jian Zhu ◽  
Yue Chen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Rotational Speed ◽  
Magnetic Field Intensity ◽  
Optical Glass ◽  
Orthogonal Experiment ◽  
Optical Field ◽  
Basic Material ◽  
Finishing Process ◽  
Magneto Rheological ◽  
The Magnetic Field

Optical glass is widely used as the most important basic material in optical field. In this paper, four different shape finishing tools are designed for polishing flat K9 glass by using magneto-rheological finishing process. Influences of the finishing tool’s shape on surface roughness are investigated and analyzed under different related parameters such as finishing time, rotational speed of tool and finishing gap. The result shows that the slotted tool could obtain better surface roughness than the non-slotted tool under the same conditions. Through changing the magnetic field intensity, finishing gap, rotational speed of tool and finishing time, an orthogonal experiment is conducted to obtain the optimal finishing process parameters.

Influences of Turning Parameters on Surface Roughness in Ultra-Precision Diamond Turning Processing Technology

2014 ◽  
Vol 978 ◽  
pp. 52-55
Author(s):  
Kong Lian Xu ◽  
Zan Wu Tan
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Magnetic Field Intensity ◽  
Orthogonal Experiment ◽  
Diamond Turning ◽  
Processing Technology ◽  
Depth Of Cut ◽  
Finishing Process ◽  
Ultra Precision ◽  
The Magnetic Field

Complex surfaces can be manufactured by using ultra-precision diamond turning processing technology, whereas the surface roughness of the workpiece is influenced by many factors, the relationships among these factors are very complex, and little research reports are found. In this paper, influences of the turning parameters on surface roughness are investigated and analyzed under different related parameters such as spindle speed, feed rate and depth of cut. The result shows that the slotted tool could obtain better surface roughness than the non-slotted tool under the same conditions. Through changing the magnetic field intensity, finishing gap, rotational speed of tool and finishing time, an orthogonal experiment is conducted to obtain the optimal finishing process parameters.

Study on Internal Magnetic Field Assisted Finishing Process Using a Magnetic Machining Jig

2005 ◽  
Vol 291-292 ◽  
pp. 281-286 ◽  
Author(s):  
Yan Hua Zou ◽  
Takeo Shinmura
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Rotational Speed ◽  
High Efficiency ◽  
Internal Surface ◽  
Processing Method ◽  
Machining Process ◽  
High Quality ◽  
Steel Tubes ◽  
Finishing Process

This paper examines a new magnetic field assisted machining process using a magnetic machining jig. By using this process, a high efficiency and high quality internal finishing process can be achieved, and it was clarified that it was very effective to finish the internal surface of a thick tube (5~30mm in thickness). In this study, the experiments performed on the SUS304 stainless steel tubes (10mm in thickness) examine the applicability of improving the internal surface roughness and the roundness of inside tube, and it also examine the effects of a rotational speed of the magnetic machining jig. The results showed that this processing method enables improve the internal surface roughness and the roundness of inside tube. It is clarified that the roundness of inside tube is highly dependent on the rotational speed of magnetic machining jig, and the roundness can be improved rapidly at a higher rotational speed with the magnetic machining jig.

Experimental Research on Smooth Surface Polishing Based on the Cluster Magnetorheological Effect

2012 ◽  
Vol 516 ◽  
pp. 79-83
Author(s):  
Jie Wen Yan ◽  
Qiu Sheng Yan ◽  
Jia Bin Lu ◽  
Wei Qiang Gao ◽  
Zhi Ying Huang
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Experimental Research ◽  
Smooth Surface ◽  
Optical Glass ◽  
Surface Polishing ◽  
Polishing Pad ◽  
Magnetorheological Effect ◽  
Mr Effect ◽  
The Magnetic Field

A new planarization polishing method, based on the cluster magnetorheological (MR) effect and using MR fluid to form the flexible polishing pad, is presented in this paper to polish optical glass. To explore the machining characteristic of the viscid and flexible polishing pad based on the cluster MR-effect, some process experiments were conducted to reveal the influence of the machining gap, the speed of the polishing disc and the polishing time on the machining effect. The results indicate that the viscid and flexible polishing pad based on the cluster MR-effect under a strong magnetic field can reduce surface roughness effectively. When the strength of the magnetic field is 2000Gs, and the content of the carbonyl iron is 12%, the surface roughness can be reduced rapidly from the original Ra0.27μm to Ra1.4nm based on the cluster MR-effect.

scholarly journals Development of a New Ultra-High-Precision Magnetic Abrasive Finishing for Wire Material Using a Rotating Magnetic Field

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 312 ◽  
Author(s):  
Lida Heng ◽  
Cheng Yin ◽  
Seok Han ◽  
Jun Song ◽  
Sang Mun
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
High Precision ◽  
Rotational Speed ◽  
Steel Wire ◽  
Rotating Magnetic Field ◽  
Magnetic Abrasive Finishing ◽  
Wire Material ◽  
Finishing Process ◽  
Abrasive Finishing

In this paper, we propose a new ultra-high-precision magnetic abrasive finishing method for wire material which is considered to be difficult with the existing finishing process. The processing method uses a rotating magnetic field system with unbonded magnetic abrasive type. It is believed that this process can efficiently perform the ultra-high-precision finishing for producing a smooth surface finish and removing a diameter of wire material. For such a processing improvement, the following parameters are considered; rotational speed of rotating magnetic field, vibration frequency of wire material, and unbonded magnetic abrasive grain size. In order to evaluate the performance of the new finishing process for the wire material, the American Iron and Steel Institute (AISI) 1085 steel wire was used as the wire workpiece. The experimental results showed that the original surface roughness of AISI 1085 steel wire was enhanced from 0.25 µm to 0.02 µm for 60 s at 800 rpm of rotational speed. Also, the performance of the removed diameter was excellent. As the result, a new ultra-high-precision magnetic abrasive finishing using a rotating magnetic field with unbonded magnetic abrasive type could be successfully adopted for improving the surface roughness and removing the diameter of AISI 1085 steel wire material.

A New Magnetic Polishing Liquid (MPL) for Precision Surface Finishing

2006 ◽  
Vol 315-316 ◽  
pp. 671-675 ◽  
Author(s):  
J. Jiang ◽  
Yong Bo Wu ◽  
Xu Yue Wang ◽  
M. Kato
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Magnetic Fields ◽  
Experimental Result ◽  
Surface Finishing ◽  
Hydrodynamic Characteristics ◽  
Magnetic Clusters ◽  
Abrasive Particles ◽  
Magneto Rheological ◽  
The Magnetic Field

This paper presents a new magnetic polishing liquid (MPL) produced by mixing sub-micron or micron order abrasive particles into a magnetic compound fluid (MCF) and its fundamental performance in surface finishing. MCF is an intelligent fluid, which is developed by mixing a magnetic fluid (MF) and a Magneto-rheological fluid (MRF) into a solvent, and hence reacting upon magnetic fields. In the present work, seven kinds of kerosene-based MPLs were prepared. The hydrodynamic characteristics of MPLs such as the viscosities under different magnetic fields were investigated. The obtained result indicated that the viscosity increases with the growing of the magnetic field and that the type of MPL affects greatly the viscosity. This phenomenon was discussed by observing the magnetic clusters formed in MPL. It was observed that the magnetic clusters are distributed along the magnetic fluxes. An experimental result indicated that the surface roughness varies with polishing time and gets smallest at a certain value of magnetic field strength.

Polishing Optical Glass by Mechanochemical Machining

2012 ◽  
Vol 236-237 ◽  
pp. 428-433 ◽  
Author(s):  
Kun Ling Wu ◽  
Hsin Min Lee ◽  
Kai Yu Jheng
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Modulus Of Elasticity ◽  
Rotational Speed ◽  
Axial Load ◽  
Surface Defects ◽  
Optical Glass ◽  
Axial Loading ◽  
Slurry Concentration ◽  
Glass Specimen

This study examined the surface defects and surface roughness of optical glass polished by mechanochemical machining. BK7 optical glass material was polished using cerium oxide (CeO2) solutions of different concentrations and temperatures. During machining, the optical glass specimen was placed between the ceramic working ring and the polishing pad. The effects of slurry concentration and temperature, polishing time, rotational speed and axial load on the surface roughness were examined. Significant improvement in surface roughness could be attained by polishing with CeO2 slurry of 95。°C. Both SEM and AFM images of BK7 polished under conditions: slurry concentration, 15%; slurry temperature, 95。C; rotational speed, 40 rpm; axial loading, 6 kg; and polishing time, 8 min show that the optical glass specimen surface had high transmittancy and became smooth with all scratches removed. The best mechanical properties in terms of Young’s modulus of elasticity and hardness were obtained by polishing with CeO2 slurry of 60。C. Although better surface roughness can be attained with further increase in slurry temperature, the enhanced reaction under high slurry temperature undermined the mechanical properties of the glass specimen.

Modelling and analysis of a magneto-rheological damper featuring non-magnetized flow paths in the piston

2020 ◽  
Vol 234 (10-11) ◽  
pp. 2665-2679
Author(s):  
Guo-Jie Li ◽  
Wen-Bin Shangguan ◽  
Subhash Rakheja
Keyword(s):  
Magnetic Field ◽  
Constitutive Model ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Coil Current ◽  
Flow Paths ◽  
Proposed Model ◽  
Force Velocity ◽  
Magneto Rheological ◽  
The Magnetic Field

The damping characteristics of a magneto-rheological damper featuring non-magnetized flow paths in the piston are analysed using the Eyring constitutive model considering both viscous and minor hydraulic losses. The force–displacement and force–velocity characteristics of the magneto-rheological damper with non-magnetized flow paths were experimentally evaluated under different excitations and magnetic field intensity. Experimental results revealed relatively largerpre-yield-like region, attributed to flows through the non-magnetized paths, which increased with an increase in the coil current. A mathematical model of the damper was subsequently formulated using the Eyring constitutive model considering pressure drop across the piston and viscous effect in addition to the current-dependent friction. The Eyring model parameters were identified as a function of the magnetic field intensity and thus the coil current. For this purpose, a finite element model was formulated to identify a relation between the coil current and the magnetic field intensity. The validity of the proposed model is demonstrated by comparing the model-predicted force–velocity characteristics with the measured data under different applied currents. The model results are also compared with those obtained from the widely reported modified Bouc–Wen model and the Bingham constitutive model. The comparisons showed that the Eyring constitutive model can yield more accurate predictions of the damping properties compared to the Bingham model but similar to those from the modified Bouc–Wen model, while the Bouc–Wen model involves identifications of considerably greater number of parameters. The proposed model provided more accurate prediction of the damping force in the pre-yield region compared to the other models.

Nano-Precision Synergistic Finishing Process Integrated ELID-Grinding and MRF

2009 ◽  
Vol 69-70 ◽  
pp. 49-53
Author(s):  
Shao Hui Yin ◽  
Hitoshi Ohmori ◽  
Wei Min Lin ◽  
Yoshihiro Uehara ◽  
Feng Jun Chen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Optical Materials ◽  
High Efficiency ◽  
High Surface ◽  
Grinding Wheel ◽  
Form Accuracy ◽  
High Surface Quality ◽  
Elid Grinding ◽  
Finishing Process ◽  
Magneto Rheological

ELID (electrolytic in-process dressing) grinding was proposed by one of the authors for automatic dressing the grinding wheel while performing grinding for a long time. It offers a high effective way and has been widely used for grinding hard and brittle optical materials. However, those surfaces produced by fixed abrasive grinding are characterized by considerable sub-surface damage, micro-crack. Magneto-rheological finishing (MRF) is a novel precision finishing process for deterministic form correction and polishing of optical materials by utilizing magneto-rheological fluid. In this paper, an ultra-precision synergistic finishing process integrated MRF and ELID grinding is proposed for shorten total finishing time and improve finishing quality. A lot of nano-precision experiments have been carried out to grind and finish some optical materials such as silicon, silicon carbide, etc. ELID grinding is employed to obtain high efficiency and high surface quality, and then, MRF is employed to improve further surface roughness and form accuracy. In general, form accuracy of ~ λ/20 nm peak-to-valley (P-V) and surface roughness less than 10 Angstrom are produced in high efficiency.

Modeling of surface roughness in a novel magnetorheological gear profile finishing process

2020 ◽  
pp. 095440622097826
Author(s):  
Ravi Datt Yadav ◽  
Anant Kumar Singh ◽  
Kunal Arora
Keyword(s):  
Surface Roughness ◽  
Gear Tooth ◽  
Surface Characteristics ◽  
Spur Gear ◽  
Tooth Profile ◽  
Tooth Surface ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Finishing Process ◽  
Gear Profile

Fine finishing of spur gears reduces the vibrations and noise and upsurges the service life of two mating gears. A new magnetorheological gear profile finishing (MRGPF) process is utilized for the fine finishing of spur gear teeth profile surfaces. In the present study, the development of a theoretical mathematical model for the prediction of change in surface roughness during the MRGPF process is done. The present MRGPF is a controllable process with the magnitude of the magnetic field, therefore, the effect of magnetic flux density (MFD) on the gear tooth profile has been analyzed using an analytical approach. Theoretically calculated MFD is validated experimentally and with the finite element analysis. To understand the finishing process mechanism, the different forces acting on the gear surface has been investigated. For the validation of the present roughness model, three sets of finishing cycle experimentations have been performed on the spur gear profile by the MRGPF process. The surface roughness of the spur gear tooth surface after experimentation was measured using Mitutoyo SJ-400 surftest and is equated with the values of theoretically calculated surface roughness. The results show the close agreement which ranges from −7.69% to 2.85% for the same number of finishing cycles. To study the surface characteristics of the finished spur gear tooth profile surface, scanning electron microscopy is used. The present developed theoretical model for surface roughness during the MRGPF process predicts the finishing performance with cycle time, improvement in the surface quality, and functional application of the gears.

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