PIMPRI CHINCHWAD COLLEGE OF ENGINEERING

MAGNETIC ABRASIVEFINISHING PROCESSMarathwada mitra mandals COLLEGE OF ENGINEERINGGUIDED BY :Mr. P.V. SAWAI

PRESENTED BY : Rahul Sangappa LokhandeROLL NO. C331T120450908

INTRODUCTIONTraditionally finishing processes are crucial, expensive uncontrolled and a labour intensive phase in the overall production.It also include total production cost and time.The ever increasing demand from the industry for better quality & cost competitive product with complex design material need to good surface finishing.In case of some application like internal finishing of capillary tube, machining of titanium alloy, aircraft application , medical application where high surface finish parts are required.Magnetic abrasive finishing (MAF) is the process which capable of precision finishing of such work pieces.Since MAF does not require direct contact with the tool, the particles can be introduced into area which are hard to reach by conventional techniques.

FINISHING PROCESSES

LAPPINGBUFFING

FINISHING PROCESSES

HONINGBURNISHING

LITERATURE REVIEWNAMETITLEOUTCOMEST.Mori, K.Hirota , Y. Kawashima(2003)Clarification of magnetic abrasive finishing mechanism1. There is brush forming energy involved in the formation of magnetic abrasive brush in the MAF process.2. Most of the normal force applied within the area of 1mm radius and the degree concentration is larger than that of magnetic flux density distribution.Dhirendra K. Singh(2004)Parametric study of magnetic abrasive finishing processImportant parameter influencing MAF are : Voltage (DC) applied to magnet, working gap, rotational speed of the magnet and abrasive size (mesh number).

NAME TITLE OUTCOMEJunmo Kang, Hitomi Yamaguchi(2012)Internal finishing of capillary tube by MAFA conditioned required realize the use of with alternating magnetic and nonmagnetic regions.The use of the multipole tip system with tool & alternating magnetic region for MAF process.Harish Kumar,Sehijpal Singh(2013)Magnetic abrasive finishingMagnetic abrasive finishing process with pearmant magnet,alternating current, direct current is used for finishing of internal and external surfaces of complicated design.

CLASSIFICATION OF MAFBASED ON TYPE OF MAGNETIC FIELD

1. Magnetic Abrasive Finishing With Permanent Magnet2. Magnetic Abrasive Finishing With Direct Current3. Magnetic Abrasive Finishing With Alternating Current

BASED ON WORKPIECE

1. Lathe based MAF2. Milling based MAF

WORKING OF MAGNETIC ABRASIVE FINISHING PROCESS

MAF is process in which mixture of non ferromagnetic abrasive and feromagnetic iron particle is taken and magnetically energized using a magnetic field.The work piece is kept between the two poles (N&S POLE ) of a magnet.The working gap between the work piece and a magnet is filled with magnetic abrasive particle (MAPs).MAPs can be used as bonded or unbonded.The magnetic abrasive particles join each other along lines of magnetic force and form a flexible magnetic abrasive brush (FMAB).This brush behave like a multipoint cutting tool for the finishing operation.

MECHANISM OF MAGNETIC ABRASIVE POLISHING

APPLICATIONINTERNAL FINISHING OF CAPILLARY TUBE

Influence of work piece circumferential speed on surface finishInfluence of Work Piece Hardness on Surface Finish

RESULTS AND DISCUSSION

Influence of Magnetic Flux Density (MFD) on Surface Finish

Influence of gap between work piece and magnetic pole on surface finish

ADVANTAGES Able to attain wide range of surface characteristics by careful selection of magnetic particles Enhance surface characteristics such as wet ability or reducing friction. Capability to accessing hard to reach areas. Capable of modifying roughness without altering form. Setup is independent of work piece material; it can efficiently finish ceramics, stainless steel, brass, coated carbide and silicon. Due to the flexible magnetic abrasive brush, it can finish any symmetric work piece shape, if electromagnet designed accordingly. It possesses many attractive advantages such as self-adaptability and controllability. The finishing tool requires neither compensation nor dressing The method can finish ferromagnetic materials but as well as non-ferromagnetic materials.

DISADVANTAGES It is difficult to implement Magnetic abrasive finishing in mass production operation. Not applicable for some ordinary finishing task where conventional finishing technique can be easily implemented. Time consuming process. The cost of process is high.

APPLICATION Cutting tools Turbine blades Air foils Optics Sanitary pipes Food industry Capillary tubes, needles, biopsy needles in ,medical field Curved pipes

FUTURE SCOPEStudy on the different combination of abrasive particles and magnetic cluster to widen the approach of process.Use of MAF in other than manufacturing industries.Use of Abrasive Nano techniques for finishing.

CONCLUSIONMagnetic abrasive finishing process can be used for surface finishing as well as surface modification of hard to finish surfaces such as brass, stainless steel, etc. Magnetic abrasive finishing can be successfully used for finishing of internal as well as external surfaces of complicated design. In magnetic abrasive finishing process, magnetic force is affected by the material, shape and size of work, work-pole gap distance, and composition of magnetic abrasives.The MAF-processed improves tribological properties, reduces the friction on the chip-tool interface, and results in extended tool life. Smoothing with minimal material removal and negligible changes in cutting edge geometry.

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