Influence of Air-Knife Wiping on Coating Thickness in Hot-Dip Galvanizing  

作　　者：ZHANG Yan CUI Qi-peng SHAO Fu-qun WANG Jun-sheng ZHAO Hong-yang 

机构地区：[1]College of Information Science and Engineering,Northeastern University,Shenvan,110004,Liaoning,China [2]University of Science and Technology Liaoning,Anshan 114000,Liaoning,China [3]Angang Steel Co Ltd,Anshan 114021,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2012年第6期70-78,共9页

基　　金：Sponsored by National Natural Science Foundation of China (50604006);National Development and Reform Commission of China (2009-354)

摘　　要：In hot-dip galvanizing process, air jet wiping control is so crucial to decide the coating thickness and uni- formity of the zinc layer on the steel strip. The mathematical models developed predict the zinc coating thickness as a function of pressure and shear stress. The required pressure and shear stress profile on the strip surface were calcu- lated using regression analysis, and carried out using numerical simulation as FLUENT, a finite element analysis software. The influences of the outlet pressure, the nozzle to strip distance, the slot opening, the edge baffle plate, as well as the tilting angle of air knife were discussed. Combining with these results and regression analysis on the practical data, four first-order polynomial multi-parameter models were established for different targeted coating thicknesses with better regression coefficients. The validated model was used to carry out sensitivity analysis to de- termine the favorable controlling regime for the air jet wiping process.In hot-dip galvanizing process, air jet wiping control is so crucial to decide the coating thickness and uni- formity of the zinc layer on the steel strip. The mathematical models developed predict the zinc coating thickness as a function of pressure and shear stress. The required pressure and shear stress profile on the strip surface were calcu- lated using regression analysis, and carried out using numerical simulation as FLUENT, a finite element analysis software. The influences of the outlet pressure, the nozzle to strip distance, the slot opening, the edge baffle plate, as well as the tilting angle of air knife were discussed. Combining with these results and regression analysis on the practical data, four first-order polynomial multi-parameter models were established for different targeted coating thicknesses with better regression coefficients. The validated model was used to carry out sensitivity analysis to de- termine the favorable controlling regime for the air jet wiping process.

关 键 词：hot-dip galvanizing air knife air jet wiping numerical simulation coating thickness 

分 类 号：TQ018[化学工程] TG174.442[金属学及工艺—金属表面处理]