YVO_4レーザを用いた発色加工 : 発色の高速化と微細化の考察(機械要素,潤滑,工作,生産管理など)  [in Japanese] Surface Treatment Regarding Coloring Using YVO_4 Laser : Consideration Regarding High Speed and Microscopic Coloring(Machine Elements and Manufacturing)  [in Japanese]

Recently, stainless steel and titanium are mainly used as a structure material. And some surface treatments regarding coloring for these metals are used for producing high quality industrial product. In previous study, we have proposed that coloring for stainless steel and titanium using YVO_4 laser became possible, the desired colors could be made by the inverse analysis using neural network, the new coloring method was effective for controlling regarding coloring of the sensitive color and the oxide film of titanium after heat treatment had photocatalytic. In this paper, both high speed coloring and microscopic coloring were investigated for improvement of both the productivity and the quality. Limit of the laser power for high speed coloring was at first researched by the experiment. The new method for high speed coloring was also developed and evaluated. The stable coloring on the curved surface was developed by using adjustment of defocus. Limit of size for microscopic coloring was finally investigated by the experiments with both conventional machine and new set-up. It is concluded from the results that (1) The new method for high speed coloring was effective for high productivity, (2) The coloring using adjustment of spot size could achieve uniform and stable coloring on the curved surface, (3) Limit of size for microscopic coloring with the new set up was 10μm.