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Chromate Plating Characteristics Using Pressurized Floating of Random-Loaded Products
김덕기(Duck Gi, Kim),이종항(Jong Hang Lee) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.9
Plating small sizes and quantities of workpieces requires their random loading in baskets, rather than individual loading manually. This random loading results in rubbing and collision amongst them, thereby making it impossible to conduct chemical reactions for plating, 4as the plating solution is unable to permeate to the overlapping workpiece surfaces. In this study, we developed a new plating technique under floating workpieces, by spraying high pressurized solution into a randomly loaded basket. In addition, this is accompanied by automatic optimization of the concentration through stirring of the plating solution. Experiments show that test samples were successfully floated at the optimized pressure of 50 kN/㎡. In addition, experiments in the plating parameter variation show the best plating performance at temperatures of 40℃, A and B chromate concentration at ratio = 1 : 2, an immersion time of 180 sec, and the pH value of 2.2, under optimized floated conditions.
김덕기(Duck Gi Kim),이종항(Jong Hang Lee) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.6
The chemical-plating quality of random-loaded small parts depends on the gap control between the parts in the bath. In this study, the plating characteristics for the screw motion of a basket in a bath were analyzed. This motion could be separated into parts for each, and the space for chemical reactions could be created, which improved its quality. The performance of the new technique was verified through experimental design and salt spray tests. The experimental results showed that the main factors that affected quality were temperature and plating solution concentration. In particular, the white rusting generated time of the screw motion method was longer than that of the conventional method.
Improvement of Chromate Plating Characteristics Using Vibration
허우석(Woo Seok Heo),이종항(Jong Hang Lee),김덕기(Duck Gi Kim) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.1
In the chemical plating of the randomly loaded workpiece, it is very important to promote the agitation of plating solution and secure the space for the chemical reaction. This study investigated the possibility of chemical plating using only vibration, as well as the plating characteristics for a combination of vibration and pressurized floating. The results of the study indicate that it is possible to perform chemical plating with only vibration, and the amount of plating increases as the vibrating frequency increases. Additionally, when combined with the vibration and pressurized floating, the probability of securing a chemical reaction space and the probability of stirring become high, resulting in highly effective plating.