Study of magnetic abrasive finishing on freeform surface

Vahdati, Mehrdad; Rasouli, Seyed Alireza

doi:10.1080/00202967.2016.1232822

Cited by 17 publications

(10 citation statements)

References 14 publications

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“…Wang studies the effect of internal magnetic abrasive finishing of thin and long austenitic stainless steel tubes [10]; also in addition, improving the internal surface finishing of the bent tube made of stainless steel (SUS304) by using the MAF process has been studied by [11]. Besides finishing inner tubes, the MAF system has a unique potential to improve the finishing of free-form surface operations [ 12 ] which are required for some industrial applications such as biomedical, and special surface patterns. For instance, the femoral component of a knee prosthetic requires a specific surface pattern and a level of roughness to function properly.…”

Section: Maf Applicationsmentioning

confidence: 99%

Development the Flexible Magnetic Abrasive Finishing Process by Transmitting the Magnetic Fields

Moghanizadeh¹

2021

Preprint

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The objective of this research is to present a novel approach in magnetic abrasive finishing to improve its potential for creating different finishing patterns in free-form surface using no special fixtures or tool machines to minimize the complexity of the process. The key point of this idea is that magnetic abrasive particles can move in especial patterns by transfer magnetic fields (similar a magnetic train moving on a magnetic rail) and create the desired polishing patterns on the surface simultaneously. The coils are placed under a thin plate, then a flexible magnetic path is created by a special arrangement of magnetic coils, after that, the coils are turned on and off in turn, and the magnetic abrasive particles move in the created path and abrasive the surface. The continuous movement of magnetic abrasive particles under the magnetic field will lead to abrasive the surface of thin sheets. The tests were performed on copper sheets with a thickness of 1 mm. Experimental parameters include electric current (0.25, 0.5, and 0.75A), speed of turning on and off of the coils (speed of magnetic abrasive particle movement) (20, 30, and 40 mm/s), and process time (1, 2, and 3 hours). The experiments were performed on an L-shaped and free-form sheets. The results show that using a transmission magnetic field in the MAF (TMAF) makes it easy to create different surface roughness patterns in different directions simultaneously. While in one part of the L shape the electric current is 0.25A, the surface roughness of is around 0.9 µm, in the other part, where the electric current is 0.75A, the surface roughness of is around 0.55 µm. Meanwhile, TMAF makes it possible to finish a free-form surface with no special fixtures. Moreover, there is a direct relationship between the change in the surface roughness and the electric current and process time.

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Section: Maf Applicationsmentioning

confidence: 99%

Development the Flexible Magnetic Abrasive Finishing Process by Transmitting the Magnetic Fields

Moghanizadeh¹

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Wang studies the effect of internal magnetic abrasive finishing of thin and long austenitic stainless steel tubes [11]; in addition, improving the internal surface finishing of the bent tube made of stainless steel (SUS304) by using the MAF process has been studied by [12]. Besides finishing inner tubes, the MAF system has a unique potential to improve the finishing of free-form surface operations [13] which are required for some industrial applications such as biomedical, and special surface patterns. For instance, the femoral component of a knee prosthetic requires a specific surface pattern and a level of roughness to function properly.…”

Section: Introductionmentioning

confidence: 99%

“…Fig 13. The effect of TMAF on the surface roughness in two perpendicular directions with different magnetic fields' value (electrical current of coils in path A-B is 0.25 A, and electrical current of coils in path B-C is 0.5 A) (finishing time is 1 h) (error bars represent standard deviation of five independent experiments)…”

mentioning

confidence: 99%

Development the flexible magnetic abrasive finishing process by transmitting the magnetic fields

Moghanizadeh

Ashrafizadeh

Bazmara

2021

Int J Adv Manuf Technol

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This research aims to present a novel approach in magnetic abrasive finishing to improve its potential for creating different finishing patterns in the free-form surface using no special fixtures or tool machines to minimize the complexity of the process. The key point of this idea is that magnetic abrasive particles can move in special patterns by transfer magnetic fields (similar to a magnetic train moving on a magnetic rail) and create the desired polishing patterns on the surface simultaneously. The coils are placed under a thin plate; then, a flexible magnetic path is created by a special arrangement of magnetic coils; after that, the coils are turned on and off in turn, and the magnetic abrasive particles move in the created path and abrasive the surface. The continuous movement of magnetic abrasive particles under the magnetic field will abrade the thin sheets' surface. The tests were performed on copper sheets with a thickness of 1 mm. Experimental parameters include electric current (0.25, 0.5, and 0.75 A), speed of turning on and off of the coils (speed of magnetic abrasive particle movement) (20, 30, and 40 mm/s), and process time (1, 2, and 3 h). The experiments were performed on L-shaped and free-form sheets. The results show that using a transmission magnetic field in the MAF (TMAF) makes it easy to create different surface roughness patterns in different directions simultaneously. While in one part of the L-shape the electric current is 0.25 A, the surface roughness is around 0.90 µm, in the other part, where the electric current is 0.75 A, the surface roughness is around 0.49 µm. Meanwhile, TMAF makes it possible to finish a free-form surface with no special fixtures. Moreover, there is a direct relationship between the change in the surface roughness and the electric current and process time.

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“…13 In the MAF process, various parameters, that is, feed, the gap between polishing tool and workpiece, polishing tool rotational speed, etc., are studied to verify the effects of polishing for freeform surface. 14, 15 Many MRF-based polishing setups are developed to polish the freeform surfaces. The process parameters of MRF such as current to change the magnetic field, tool rotation speed, and working gap are studied and optimized.…”

Section: Introductionmentioning

confidence: 99%

Investigations on flexible pad polishing for nano-finishing of freeform optics mold

Mishra

Burada

Karar

et al. 2020

Journal of Micromanufacturing

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The need for freeform surfaces are widely recognized in the optical, aerospace, biomedical, and automotive industries. However, the fabrication of freeform surfaces is very difficult and expensive because of the involvement of advanced, multi-axis, dedicated machining processes. In many applications, the machining surface needs further polishing to reduce the surface roughness. The main aim of this work is to investigate the flexible pad polishing process for the finishing of the freeform surface. To achieve this, a flexible pad polishing setup is developed in two-axis configuration that can be integrated with a diamond turning machine or any other computer numerical control (CNC) machine and capable to polish the conventional rotationally symmetric surfaces as well as freeform surfaces. The polishing parameters for the developed polishing head are optimized for the nano-finishing of the freeform mold surface of Stavax ESR steel. The effectiveness of the current polishing setup is demonstrated by measuring the improvement in surface roughness height and profile. Test results reveal that the improvement on the freeform surface is significant, that is, surface roughness ( Ra) reduces from 220 nm to 25 nm while keeping the profile within the desired tolerance.

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Study of magnetic abrasive finishing on freeform surface

Cited by 17 publications

References 14 publications

Development the Flexible Magnetic Abrasive Finishing Process by Transmitting the Magnetic Fields

Development the Flexible Magnetic Abrasive Finishing Process by Transmitting the Magnetic Fields

Development the flexible magnetic abrasive finishing process by transmitting the magnetic fields

Investigations on flexible pad polishing for nano-finishing of freeform optics mold

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