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배한진(Han-Jin Bae),이병헌(Byung-Hun Lee),이채석(Chae-Suk Lee),신칠석(Chil-Seok Shin) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
For application of high-performance coating in a new shipbuilding, the abrasive blasting cleaning is widely favored primarily because of its economic and performance benefits. Blasting cleaning productivity is known to be affected by a number of parameters, such as air pressure at the nozzle, air volume, abrasive/air mixing ratio, abrasive type and size, and type of nozzle used, and so on. To achieve the economic benefits from abrasive blasting, proper selection and matching of these parameters are essential. In this study, a quantitative relationship between blastingrelated operation parameters and blasting efficiency is evaluated, and the optimum blasting conditions are sought, which can dramatically improve the blasting productivity as well as effectively meet new IMO’s PSPC surface preparation requirements. The results clearly indicated that the newly optimized blasting condition can remarkably reduce the amount of abrasive used. Adjusting the profile height by careful selection of the primary variables such as abrasive size and nozzle pressure, which are closely related to the surface roughness, is important in meeting the new IMO standard.
백재진(J.J.Back),정몽규(M.K.Chung),신칠석(C.S.Shin),백광기(K.K.Back) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Abstract: We have studied on the main causes of pressure drop in the paint hose under the spraying with airless spray pump and suggest calculation method for selecting the optimum<br/> pressure drop during the spraying. Among many factors contributing the pressure drop during the airless spraying procedure of paint, some of the key factors and the correct method for checking. pressure loss between airless pump and spray gun are addressed. We have developed pressure loss calculation method which depending on hose length and diameter, viscosity and flow rate in the painting hose during the spraying. also we have developed calculation equation for the expected spray tip flow rate which depending on pressure and specific gravity and tip size
Grit와 Air의 혼합비 최적화를 통한 블라스팅 효율 향상
배한진(Han-Jin Bae),백재진(Jae-Jin Baek),김을현(Eul-Hyun Kim),정몽규(Mong-Ku Chung),신칠석(Chil-Seok Shin),백광기(Kwang-Ki Baek) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Achieving the maximum blasting efficiency with minimum abrasive consumption is a critical concern in surface preparation stage of shipbuilding and offshore industry. Increasing the abrasive flow rate beyond the optimum point results in a major reduction in productivity even though the amount of abrasive used is larger. So, this study is intend to find out the optimum abrasive-to-air mixing ratio which can make a significant improvement in blasting efficiency and remarkably reduce the amount of abrasive used. From the test results, it can be identified that as the abrasive feeding rate is increased linearly, blasting efficiency is increased to a maximum point and then gradually decreased in the form of a bell-shaped.