Effect of laser rust removal on surface roughness of 3Cr2Mo die steel

In order to extend the service life of injection mold, the use of laser rust removal was used to repair the surface quality of mold steel in this paper. The surface corrosion of mold steel was removed by using the laser dry cleaning method, then the surface roughness was restored to the initial state to meet the performance requirements of manufacturing. By analyzing the experimental results, the influence of laser energy density, spot overlap rate and scanning times on improving the surface quality of corroded area was obtained. It was shown that when the laser energy density, spot overlap rate and scanning times is 26 J/cm2, 18% and 3 times respectively, the optimum surface roughness of Sa2.32μm can be obtained, which meets the production requirements. Compared with traditional rust removal methods, the laser rust removal of the mold surfaces deserves more extensive research and application due to its advantages of high efficiency, precision and environmentally friendly.