| Summary: | 碩士 === 雲林科技大學 === 機械工程系碩士班 === 98 === In this study, using abrasive jet silicon carbide method blasting on the smooth surface of stainless steel, forms a surface profile with a high roughness, the stainless steel were irradiated by continuous mode (CW) CO2 laser applied to formation through hole, cutting straight line and surface hardening process. Due to original stainless steel was making by cold rolling method and grinding process, result in smoothness surface, the smooth surface will lead to material with high reflectivity, which will causing infrared laser machining rate become ineffective. At the conventional scale, dealing with such condition can only increasing laser output power to overcome the high reflectivity problem.
Using sandpaper grinding and abrasive jet blasting to made the surface coarsened, discuss with taking various mesh number of sandpaper and different coarse sand of grits blasting, complex with coaxial gas-assisted CO2 laser cutting stainless steel specimens and laser surface hardening process, under the coarse sand blasting and coaxial shielding gas on the stainless steel surface may enhance CO2 laser absorbed rate, effectively reducing the laser irradiation reflection problem. On the other hand, Using same laser condition, including output power, laser focus length, defocus position and assist gas pressure, pre-abrasive jet blasting on stainless steel surface can enhance machining efficient and rapidly roughening workpiece surface, integrating with the laser system shows more significant effect and machining efficiency on laser processing.
The study also focus on laser cutting, stainless steel SUS304 after SiC coarse sand blasting surface than smooth surface of cold rolling, the cutting depth increased by 125%. In the laser surface hardening experiment, after blasting roughness on the surface of stainless steel SUS440C, the effective hardening depth and the maximum hardness value increased significantly than the smooth surface.
|
|---|
