(Abstract) Cutting fluids are important working materials in the metal industry and the usage of cutting fluid has been increasing with the development of metal processing year by year. A cutting fluid used for a long time has to be replaced by new one because the fluid gradually degraded and after ...
(Abstract) Cutting fluids are important working materials in the metal industry and the usage of cutting fluid has been increasing with the development of metal processing year by year. A cutting fluid used for a long time has to be replaced by new one because the fluid gradually degraded and after being used for 3~6 months the first performance(cutting, grinding) and the second performance(Septicity Prevention, cooling) are reduced. The main reason of cutting fluid replacement was occurrence of odors arising from putrefaction processes. In order to prevent the degradation of metal working fluid, Biocide, a kind of microorganism disinfection products has been injected up to now. However, Biocide can cause respiratory, skin, and physiological diseases. The objectives of this research were intending to offer materials for the improvement of working environment and get long-term usage of soluble cutting fluid by using UV-free reflecting reactor(253.7nm). By changing on intensity and time of UV-irradiation, investigating effects of the treatment process and observing the variation of characteristics and activity of microorganisms that mainly cause putrefaction of soluble cutting fluid optimized factors were derived. Prominent bacterial colonies in cutting fluid are pseudomonas series that can consume everything and grow easily even though in poor environment. They have ability to degrade oil ingredients, moreover that bacteria mainly cause putrefaction of long-term using soluble cutting fluid and deteriorate the quality of cutting fluid by reducing oil contents. We investigated variation of characteristics according to different durations of irradiation in which the intensity of UV-irradiation for death of microorganism was applied: ① 5 Lamps (uniform 430mm in length, 40W) ② 10 Lamps (uniform 430mm in length, 40W) The results of the experiment are as follows: ① In case of using lamps, the results were SS 0.115㎎/ℓ, Viscosity 1.07cP, pH 8.54 for 20 minutes irradiation ② In case of using 10 Lamps, the results were SS 0.093㎎/ℓ, Viscosity 1.09cP, pH 8.67 for just 5 minutes irradiation and these results were attained to concentration values of Fresh cutting Fluid. To inspect influences of intensity and time of UV irradiation on quantitative and qualitative determination, we got extracted n-hexane and analyzed by GC/MS, the results showed that in comparison with the variation of qualitative and quantitative determination of oil contents of soluble cutting fluid, that microorganism were active. In this case, the effect of UV-irradiation was insignificant. Therefore, we observed that it is an effective method to gain long-term usage of soluble cutting fluid by applying UV-free reflecting reactor.
(Abstract) Cutting fluids are important working materials in the metal industry and the usage of cutting fluid has been increasing with the development of metal processing year by year. A cutting fluid used for a long time has to be replaced by new one because the fluid gradually degraded and after being used for 3~6 months the first performance(cutting, grinding) and the second performance(Septicity Prevention, cooling) are reduced. The main reason of cutting fluid replacement was occurrence of odors arising from putrefaction processes. In order to prevent the degradation of metal working fluid, Biocide, a kind of microorganism disinfection products has been injected up to now. However, Biocide can cause respiratory, skin, and physiological diseases. The objectives of this research were intending to offer materials for the improvement of working environment and get long-term usage of soluble cutting fluid by using UV-free reflecting reactor(253.7nm). By changing on intensity and time of UV-irradiation, investigating effects of the treatment process and observing the variation of characteristics and activity of microorganisms that mainly cause putrefaction of soluble cutting fluid optimized factors were derived. Prominent bacterial colonies in cutting fluid are pseudomonas series that can consume everything and grow easily even though in poor environment. They have ability to degrade oil ingredients, moreover that bacteria mainly cause putrefaction of long-term using soluble cutting fluid and deteriorate the quality of cutting fluid by reducing oil contents. We investigated variation of characteristics according to different durations of irradiation in which the intensity of UV-irradiation for death of microorganism was applied: ① 5 Lamps (uniform 430mm in length, 40W) ② 10 Lamps (uniform 430mm in length, 40W) The results of the experiment are as follows: ① In case of using lamps, the results were SS 0.115㎎/ℓ, Viscosity 1.07cP, pH 8.54 for 20 minutes irradiation ② In case of using 10 Lamps, the results were SS 0.093㎎/ℓ, Viscosity 1.09cP, pH 8.67 for just 5 minutes irradiation and these results were attained to concentration values of Fresh cutting Fluid. To inspect influences of intensity and time of UV irradiation on quantitative and qualitative determination, we got extracted n-hexane and analyzed by GC/MS, the results showed that in comparison with the variation of qualitative and quantitative determination of oil contents of soluble cutting fluid, that microorganism were active. In this case, the effect of UV-irradiation was insignificant. Therefore, we observed that it is an effective method to gain long-term usage of soluble cutting fluid by applying UV-free reflecting reactor.
주제어
#절삭유 UV-조사 부패미생물 Pseudomonas Biocide
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