Magnetic Abrasive Finishing Process
Contents
S No Major Page No
1 Introduction 1
2 Process details 1
3 Mechanism of Material removal 5
4 Process Parameters Analysis 6
5 Conclusions 7
6 Advantages 8 References 9
Magnetic Abrasive Finishing (MAF) Process
Harry P. Coats first patented MAF in 1938. Although US originate this idea, most of later period development is done by USSR + Bulgaria. Japanese explore the technology for polishing purpose. Other countries in this field are: India, CIS, England, France, and Germany etc.
Process details:
• In MAP, w/p is kept between the two magnets & the air gap in-between the w/p & the magnet is filled with Magnetic Abrasive Particles (MAPs). The MAPs joined to each other, along the lines of magnetic force and form a Flexible Magnetic Abrasive Brush. The brush behaves like a multi-point cutting tool for finishing process. The vibrational, rotary & axial motion is imparted to the w/p to enhance the performance of finishing operation
• For demonstration, there are three setups commonly used. These are:
1. External contour of cylindrical workpiece: the systematic diagram are as follow:
The process principle of magnetic abrasive finishing is shown in fig. The magnetic abrasives are joined to each other; magnetically in-between magnetic poles ‘N’ & ‘S’ along the lines of magnetic forces, this imparts flexibility of magnetic brushes.
Flexibility to brush means it ability to modify itself as per workpiece contours.
When a cylindrical workpiece; with rotatory and translatory motions; is inserted, the surface and edge finishing are performed by these magnetic abrasives brushes.
The magnetic field polishing showing the two-dimensional magnetic field distribution in the finishing zone of the process. The magnetic abrasive particles form a brush around the workpiece linking the N & s poles. The magnetic flux density is stronger around the nonmagnetic workpiece (along the magnetic brushes) than through the workpiece. The magnetic abrasive at position “A” in fig. is
S No Major Page No
1 Introduction 1
2 Process details 1
3 Mechanism of Material removal 5
4 Process Parameters Analysis 6
5 Conclusions 7
6 Advantages 8 References 9
Magnetic Abrasive Finishing (MAF) Process
Harry P. Coats first patented MAF in 1938. Although US originate this idea, most of later period development is done by USSR + Bulgaria. Japanese explore the technology for polishing purpose. Other countries in this field are: India, CIS, England, France, and Germany etc.
Process details:
• In MAP, w/p is kept between the two magnets & the air gap in-between the w/p & the magnet is filled with Magnetic Abrasive Particles (MAPs). The MAPs joined to each other, along the lines of magnetic force and form a Flexible Magnetic Abrasive Brush. The brush behaves like a multi-point cutting tool for finishing process. The vibrational, rotary & axial motion is imparted to the w/p to enhance the performance of finishing operation
• For demonstration, there are three setups commonly used. These are:
1. External contour of cylindrical workpiece: the systematic diagram are as follow:
The process principle of magnetic abrasive finishing is shown in fig. The magnetic abrasives are joined to each other; magnetically in-between magnetic poles ‘N’ & ‘S’ along the lines of magnetic forces, this imparts flexibility of magnetic brushes.
Flexibility to brush means it ability to modify itself as per workpiece contours.
When a cylindrical workpiece; with rotatory and translatory motions; is inserted, the surface and edge finishing are performed by these magnetic abrasives brushes.
The magnetic field polishing showing the two-dimensional magnetic field distribution in the finishing zone of the process. The magnetic abrasive particles form a brush around the workpiece linking the N & s poles. The magnetic flux density is stronger around the nonmagnetic workpiece (along the magnetic brushes) than through the workpiece. The magnetic abrasive at position “A” in fig. is
References: 1. Jain R.K & Jain V.K. “Abrasive Fine Finishing Process-A Review”. Vol.2 No.1, 1999. 2. Jain V.K, Kumar Prashant, Behera P.K, Jayswal S.C. “Effect of working gap & circumferential speed on the performance of magnetic abrasive finishing process”. Wear 250 (2001) 384-390. 3. Kremen G.Z, Elsayed E.A, Ribeiro J.L. “Machining time estimation for magnetic abrasive processes”. Int. J. Prod.,1994,vol.32,No.12,2817-2825 4. Kremen G.Z, Elsayed E.A, Rafalovich V.L. “Machining time estimation for magnetic abrasive processes”. “Mechanism of material removal in the magnetic abrasive process and the accuracy of machining”. Int. J. Prod., 1994, vol.32, No.12, 2829-2838. 5. M. Fox, Agrawal, T. Shinmura, R.Komanduri(1),Oklahoma State University,Stillwater,OK,USA. “Magnetic Abrasive Finishing of Rollers”. Jan 11, 1994. 6. Takeo Shinmura, Toshio Aizawa. “Study on a New Finishing Process of Fine Ceramics by Magnetic Abrasives Machining”. Int. H. Japan Soc. Pre. Eng., Vol.- 28, No.-2, June 1994.