Process And Application Research Of Laser Induced Surface Coloration Of Stainless Steel

The research of laser color marking technology extends the laser marking equipment manufacturers in the field of laser marking. To the metal products, color identification mark or colorful pictures, which are made by color laser marking, may greatly enhance their value-added, such as artistic aspect, thereby enhancing the competitiveness of the metal products.For now, laser color marking technology is still in the research stage because of its great restrictions of materials and laser performance. But its unique technical features, for example non-polluting, non-contact processing, non-material removal, low cost, which will make this technology a huge market prospects in the future.Firstly, we do color laser marking process research on stainless steel based on a type of laser marking machine to explore whether this process is reasonable or not from an energy point of view. Current parameters of the laser marking machine like effective vector step, effective vector delay between steps, line distance and so on. Yet all above are with none-direct relation with colored marking. To have the laser colored marking become mass industrialized production, we turn these parameters above into laser output power, repetition rate and pulse width. The experiment proves that along with the increase of laser energy, the color of the stainless steel surface changes by the following steps:light yellow - light blue - blue - red - purple - green.Then we apply laser color marking technology into two-dimensional Data Matrix bar code for identification. This kind of bar code makes a good performance on its recognizability and recognition speed. Comparing to the traditional marking methods such as Mechanical marking, it shows a great advantage for its non-material removal and permanent marking.Finally, we designed a two-dimensional barcode recognition embedded system, including five several function modules:barcode collect module, information display module, information storage module, communication module (Wi-Fi) as well as barcode recognition module. The function modules can be divided into the application layer and system layer. The program flow and the algorithm to solve some application problems will be discussed to the application layer and as for the function module of system layer, according to the specific requirements of the application layer, combined with the selection of microprocessor and embedded operating system, peripheral devices of each module of system layer will be curtained and the hardware diagram will be designed.