DOI: 10.5176/2251-1857_M312.38
Authors: P.K.Basera, V.K.Jain
Abstract: The tapered roller bearing of aircraft propeller requires repairing and reconditioning after a certain period of service to improve the economical life. It consists of two pairs of cup, cone and rollers, which shows the complexity of the surface. All the four surfaces are closed contours and different in size and shape. Magnetic abrasive finishing (MAF) process is a multi-purpose and multi functional advanced nano-finishing process. This process is selected due to its self adaptability of the flexible magnetic abrasive brush (FMAB) in accordance with the shape of the tapered roller bearings. MAF tools are designed and fabricated according to the shape of the respective bearing surfaces. Cylindrical disc type permanent magnets are used to hold the magnetic abrasive powder (MAP) which consists of abrasive (boron carbide) particles, iron powder, glycerin and de-ionized water in appropriate composition. Finishing experiments are conducted on all the surfaces of a tapered rollers bearing. The selected parameters are volume {6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} of magnetic particles, rotational speed of magnets and working gap. The finishing process was conducted in three-stages with different mesh sizes and types of abrasives to get the desired surface finish. The best finish achieved is (Ra=) 28 nm from initial (Ra=) 943.8 nm without any surface damage. It is concluded that the {6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} change in surface roughness (Δ Ra) is significantly affected by working gap and the finishing rate (FR) by rotational speed.
Keywords: Magnetic abrasive finishing (MAF); Magnetic abrasive powder (MAP); Flexible magnetic abrasive brush (FMAB); Tapered roller bearing; {6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} Change in surface roughness (Δ Ra); Finishing rate (FR).
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