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 Ra 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.