METHOD OF LASER MICRO-MACHINING STAINLESS STEEL WITH HIGH COSMETIC QUALITY
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United States of America Patent
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app pub date -
Sep 26, 2008
filing date -
Sep 26, 2008
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Abstract
A process to laser micro-machine a metal part with a high cosmetic quality surface, including applying a protective coating layer to at least one surface of the part to physically isolate the surface from air prior to micro-machining the part with a laser, and sacrificing the protective layer to block/consume oxygen in air by carbonization and oxidation due to strong laser irradiation. The protective coating applied to at least one of a front side high quality cosmetic surface and a back side surface of the part. The coating layer being highly transparent to an applied laser beam, having a thickness of between approximately 5 mil and approximately 10 mil, inclusive, and having sufficient adhesion strength to adhere to the part without delaminating during processing. The laser can be selected from a nano-second pulse width laser and a micro-second pulse width laser to process the part.
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