| บทคัดย่อ(English) |
Electroplating is the important process in jewelry production because it is the final stationof jewelry manufacturing process. The process is electrochemical so many pieces of work will beprocessed at once. Most of materials are precious metals so when compared with other processesif there have defects in plating process, it could be high damage . At present, plating processis not been control quite well since there have not the standard in working. A jewelry factory chosen as a case study in this research has many defect problems in platingsection for example, scratch stained hazy/cloudy poor adhesion, non-adherent ,rough, pi nholeburnt deposit. These defects cause the rework in other section. Consequently, there loss themanpower materials and time to rework. The objective of this thesis was to study the cause ofthese defects and improve the jewelry electroplating process to be a standardization andcontrollable process. According to the study, it was found that the defect produced fromimproper working method , material, plating solution and rinse water. Moreover, the workinstructions were not obviously stated in written document so there was lack of controlprocess. Therefore, the problems were improved by many approaches, for example, assign thestandard work method in each step of plating process create the plating solution manual andrecommend the hull cell test to analyze plating solution. After performing the above approachit was found that the defect problems reduced from 0.59!c/: to 0.184%. Moreover, it hadassessed workman in bias and repeatability of working by adapted concepts of Measurement SystemAnalysis. |
