Improvement in Surface Characteristics of SS316L Tiny Gear Profiles by Magnetorheological-Polishing Fluid Using Flow Restrictor

Abstract

Nano-finishing of small-scale gears is difficult because their geometric complexity is really challenging. The high-speed application causes noise or vibration between the meshing teeth. The traditional method for finishing of tiny gears produces a surface error on its profiles. Very few finishing processes can be applied to SS316L tiny gears due to the narrow spacing between their teeth. In the current study, the stainless-steel tiny gear teeth profiles are polished using a novel flow restrictor by the magnetorheological-polishing fluid-based finishing process. The minimum ultrafine surface roughness R a of 23.9 nm at tiny gear teeth profiles is obtained. All surface defects like burrs, dents, scratches and pits are also completely removed. The finishing results are compared with and without using a flow restrictor. A theoretical analysis of the magnetic force responsible for finishing is also done to recognize the process accurately.

Experimental and theoretical analyses of material removal in poppet valve magnetorheological finishing

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“…When magnetic materials are is passed through a magnetic field area, total field produced inside magnetic materials is presented by equation (3). 28 where B 0 is external magnetic field. CIPs magnetization ( M CIP ) can be found from the MB curve (Supplemental Figure 3) of MRP fluid.…”

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