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利用流体力学计算方法,对连续热镀锌气刀射流拭锌过程中带钢表面气流压力和温度分布进行了仿真研究。模拟结果表明:气刀喷吹时,带钢边部5mm范围内出现压力衰减,且边部散热较中心处快,易使带钢出现边部过镀锌缺陷;为避免该缺陷发生,设计了增大边部开口度的楔形刀唇结构气刀,有效阻碍了带钢边部压力衰减,且边部镀层减薄率随楔形开口度的增加而线性增加;对于平行段开口度为1.10mm的气刀,边部开口度选定为1.18~1.22mm,有利于改善镀层均匀性。
The hydrodynamic pressure distribution and temperature distribution on the strip surface during continuous hot-dip galvanizing air knife jet wiping of zinc were simulated by hydrodynamic calculation method. The simulation results show that when the air knife blows, the pressure is attenuated within 5 mm of the edge of the strip and the edge heat dissipation is faster than the center, which makes the strip more prone to galvanized defects on the edge. In order to avoid the defect, Increasing the opening of the wedge-shaped knife lip structure of the air knife, effectively hinder the strip edge pressure attenuation, and the edge of the coating rate of decrease with the wedge-shaped opening increases linearly; for the parallel section opening of 1.10mm Air knife, the edge of the selected degree of 1.18 ~ 1.22mm, is conducive to improving the coating uniformity.