A method of laser micro-polishing for metallic surface using UV nano-second pulse and CW lasers

TL;DR

This paper presents a real-time laser energy density control method combining UV pulse and CW lasers for metallic surface micro-polishing, significantly improving surface roughness on stainless steel 316L.

Contribution

It introduces a novel real-time control technique for laser energy density using UV pulse and CW lasers, enhancing micro-polishing precision on complex metallic surfaces.

Findings

Surface roughness improved by up to 57% on stainless steel 316L.

Effective control of laser spot size and focal offset influences polishing quality.

Method applicable to inclined and curved surfaces with significant roughness reduction.

Abstract

During laser micro-polishing, the constant control of laser energy density is a key technology to improve the surface roughness. In this paper, a method which controls the energy density of UV(ultraviolet) pulse laser in real time with the control of CW(continuous wave) laser spot size in laser micro-polishing for metallic surface was presented. The experimental and analytical considerations of several influence factors such as laser spot size, fusion zone and focal offset were investigated. In addition, using a laser micro-polishing system manufactured with this method, the laser micro-polishing experiments on the two different surface shapes of stainless steel 316L were conducted. For the inclined or curved surface, the surface roughness improvements of up to 56.4% and 57.3% were respectively obtained, and the analysis of the results were discussed.