09-09-2013, 03:23 PM
ABRASIVES USED IN MAGNETICALLY ASSISTED FINISHING
[attachment=57762]
Introduction
A magnetic abrasive finishing process is defined as a process by which material is removed, in such a way that the surface finishing is performed with the presence of a magnetic field in the machining zone.
Nowadays, the study of the magnetic field assisted finishing processes is being conducted at industrial levels around the world. Most of the previous research work has been focussed on the finishing characteristics and mechanism from a macroscopic point of view using the surface roughness profiles as the measure. However, those approaches do not adequately characterize the behavior of abrasive cutting edges acting against the surface during the removal process. This paper examines the magnetic field, acting forces and provides a fundamental understanding of the process mechanism.
Abrasives
Small, hard nonmetallic particles with sharp edges and irregular shapes
Can remove small amounts of material, producing tiny chips
Abrasive processes can produce fine surface finishes and accurate dimensional tolerances
Magnetic Abrasives
Magnetic abrasives are emerging as important finishing methods for metals and ceramics. Magnetic Abrasive Finishing is one such unconventional finishing process developed recently to produce efficiently and economically good quality finish on the internal and external surfaces of tubes as well as flat surfaces made of magnetic or non-magnetic materials. In this process, usually ferromagnetic particles are sintered with fine abrasive particles (Al2O3, SiC, CBN or diamond) and such particles are called ferromagnetic abrasive particles (or magnetic abrasive particles).
Conclusions
Modern aerospace and electronic industries make frequent use of the difficult to machine materials. The micro machining of these materials with conventional edged tool is uneconomical with poor quality of the surface. A relatively new micromachining technology based on magnetic assistance has been used in the recent past to produce quality surface finish on these materials. The magnetic abrasives play an essential role of cutting tools in these processes.
[attachment=57762]
Introduction
A magnetic abrasive finishing process is defined as a process by which material is removed, in such a way that the surface finishing is performed with the presence of a magnetic field in the machining zone.
Nowadays, the study of the magnetic field assisted finishing processes is being conducted at industrial levels around the world. Most of the previous research work has been focussed on the finishing characteristics and mechanism from a macroscopic point of view using the surface roughness profiles as the measure. However, those approaches do not adequately characterize the behavior of abrasive cutting edges acting against the surface during the removal process. This paper examines the magnetic field, acting forces and provides a fundamental understanding of the process mechanism.
Abrasives
Small, hard nonmetallic particles with sharp edges and irregular shapes
Can remove small amounts of material, producing tiny chips
Abrasive processes can produce fine surface finishes and accurate dimensional tolerances
Magnetic Abrasives
Magnetic abrasives are emerging as important finishing methods for metals and ceramics. Magnetic Abrasive Finishing is one such unconventional finishing process developed recently to produce efficiently and economically good quality finish on the internal and external surfaces of tubes as well as flat surfaces made of magnetic or non-magnetic materials. In this process, usually ferromagnetic particles are sintered with fine abrasive particles (Al2O3, SiC, CBN or diamond) and such particles are called ferromagnetic abrasive particles (or magnetic abrasive particles).
Conclusions
Modern aerospace and electronic industries make frequent use of the difficult to machine materials. The micro machining of these materials with conventional edged tool is uneconomical with poor quality of the surface. A relatively new micromachining technology based on magnetic assistance has been used in the recent past to produce quality surface finish on these materials. The magnetic abrasives play an essential role of cutting tools in these processes.