Processing method for hot-dip galvanized sheet used by automobile

Abstract

The invention discloses a processing method for a hot-dip galvanized sheet used for an automobile, belonging to the technical filed of steel belt continuous hot-dip galvanization. The method comprises the following steps: a pair of first air knives respectively provided with a first air blowing port is arranged in a furnace nose which is used for ensuring steel belts under a close condition to enter a zinc port containing zinc solution and arranged at a position corresponding to the part above the surface of the zinc solution; the steel belts are led from the furnace nose, then pass the part between the pair of the first air knives, and enter into the zinc port under the state that the first air blowing ports of the pair of the first knives blow the surface of the zinc solution; steel belts are led out of the zinc port because of the redirection of a sink roll in the zinc rot so as to ensure the steel belts which are led out form the zinc pot and adhered with zinc solution on the surface to pass the part between a pair of second air knives, wherein the pair of second air knives correspond to one side of the top of the zinc pot and are respectively provided with a second air blowing port; and as the second air blowing ports of the pair of second air knives sweep residual zinc solution adhered on the surfaces at two sides of the steel belts in a blowing manner, the hot-dip galvanized sheet used by vehicles is obtained through winding. The invention has the advantage of avoiding the defect of skip plating generated from surface slag adhering and ash adhering of the hot-dip galvanized sheet, thus ensuring the surface quality of the hot-dip galvanized sheet.

Description

technical field [0001] The invention belongs to the technical field of continuous hot-dip galvanizing of steel strips, and in particular relates to a processing method of a hot-dip galvanized sheet for automobiles. Background technique [0002] With the progress of the times and the continuous improvement of the quality of human life, the corresponding rapid development of the automobile industry has made hot-dip galvanized steel sheets used as panels on vehicles more and more widely, and the surface quality of hot-dip galvanized sheets has become increasingly demanding Harsh. However, the hot-dip galvanized sheet for vehicles processed by the current processing method is not enough to meet the increasingly stringent surface quality requirements. The specific surface defects are: various shapes and sizes appear on the surface of the sheet body And basically irregular surface sticky slag and sticky dust missing coating defects, and this defect has become a major problem rest...

AI Technical Summary

Problems solved by technology

The so-called focus on this means that the zinc liquid in the furnace nose is sucked by the zinc pump, which has a certain effect on alleviating sticky slag and ash. The so-called loss of the other means that the zinc liquid has a serious corrosion effect on the zinc pump. Zinc pumps need to be repaired or replaced frequently, which not only affects the production efficiency of hot-dip galvanized sheets, but also unreasonably increases costs and expenses

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