Appropriate carbon dioxide snow cleaning conditions for reworked component

Abstract

The purpose of study is to identify appropriate Carbon Dioxide cleaning conditions to HDD reworked parts in company. This research is to determine the appropriate conditions of Completed Dry Air Heater Temp.(C), Pressure (PSI) setting, CO2 amount setting and Distance of CO2 nozzle (Inch) for CO2 cleaner setting. These appropriate conditions can be used as the fundamental data for controlling cleaning operations at CO2 cleaner to enhance reworked part cleanliness. The research starts from selecting the factors, which involve the change in the Complete Dry Air Heater Temp.(C), Pressure (PSI) setting, CO2 amount setting and Distance of CO2 nozle (Inch) that has an effect to The cleanliness of part. Those factors are the major that we would like to determine an appropriate condition of CO2 cleaner. The following conditions are initially started for this research. 1. Completed Dry Air Heater Temp.(C) 80(min-120(max) 2. Pressure (PSI)setting 650(min)-950(max) 3.CO2 amount setting 0.1(min)-1(max) 4. Distance of cO2 nozzle (Inch) 0.5(min)-2(max) The factorial designed experiments for the four factors are performed and cn be concluded that three main factors are Pressure (PSI), CO2 amount and Distance of CO2 nozzle (Inch) and there are two interaction effects: Pressure and CO2 amount, And between Pressure and Distance of CO2 nozzle. So, those factors are designed experiment to find an appropriate CO2 cleaner. Finally, the confirmation experiment with six samples , which set the parameter from factorial design analysis. It brings about the conclusions that the pressure is the most effect, high pressure makes result of LPC lower. It could be reliable to be applied to the reworked part cleaning process. The results of this research can be condluded that Pressure (PSI), CO2 amount and Distance of CO2 nozzle (Inch) are main effect to cleaning process. And this appropriate condition will be applied to the cleaning process, leading to the reduction of particles contamination. The appropriate condition are showed as follows, 1. Set pressure to 950 PSI 2. Set CO2 amount to 0.1 3. Set Distance of CO2 nozzle to 2 Inch