Production method of sink roll

Abstract

The invention discloses a production method of a sink roll. The production method comprises the following steps of Step 1, processing left and right spiral grooves in the circumferential surface of a sink roll body; Step 2, performing sand blasting treatment on the surface of the sink roll; Step 3, performing five-time variable-angle bottom layer spraying processing of the corrosion-resistant and wear-resistant coating on the surface of the sink roll; Step 4, performing five-time variable-angle middle layer spraying processing of the corrosion-resistant and wear-resistant coating on the surface of the sink roll; and Step 5, performing five-time variable-angle surface layer spraying processing of the corrosion-resistant and wear-resistant coating on the surface of the sink roll. According to the production process provided by the invention, left and right spiral grooves which are in a reversely spiral manner are formed in the surface of the sink roll body; and the adhesion of zinc dross to the bottoms of the grooves is reduced, so that the service life of the sink roll is prolonged. According to the invention, the screw pitch is shortened, and the cross section of the grooves is designed into an arc groove form, so that the problem that groove lines are transferred onto a steel plate can be well solved. According to the method provided by the invention, the spraying method of the Step 3, the Step 4 and the Step 5 is adopted, and the spraying thickness in the groove is uniform.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing treatment equipment, in particular to a production method of a sinking roll. Background technique [0002] In order to improve the corrosion resistance of the steel plate, hot-dip galvanizing is performed on the surface, and a galvanized layer is formed on the surface of the steel plate. This steel plate is called galvanized steel plate. steel plate. Galvanized steel sheets can be roughly divided into two types: one is the GA steel sheet that heats the galvanized layer after the molten zinc treatment; the other is the GI steel sheet that does not heat the galvanized layer after the molten zinc treatment. [0003] When producing galvanized steel sheets, the quality of the galvanizing treatment is very important. The steel plate is continuously immersed in the molten zinc solution at about 500°C for treatment. In the molten zinc solution, there are rollers used to change the traveling ...

AI Technical Summary

Problems solved by technology

The surface structure of the sinking roll has a great influence on the quality of the galvanizing treatment. When using the existing sinking roll for galvanizing treatment, there are the following defects: First, it is easy to slip between the sinking roll and the steel plate, thereby damaging the surface of the steel plate The second is that the roller body of the sinking roller is generally made of stainless steel, and the stainless steel roller body is immersed in the molten zinc liquid, which will cause significant corrosion; the third is that the sinking roller and the steel plate are in a high temperature environment, and wear is prone to occur

[0005] In the above-mentioned patent documents, WC-12% Co powder is selected as the spraying material to spray on the surface of the sinking roller, forming a wear-resistant and anti-corrosion layer, which solves the corrosion and wear problems of the sinking roller in molten zinc; There are grooves on the surface of the sinking roller, which solves the slipping problem between the sinking roller and the steel plate, but in actual work, there are the following defects: First, the groove pattern on the surface of the sinking roller is often transferred to the steel plate, thereby reducing the The quality of the steel plate; the second is that the service life of the existing sinking roller is short, because there is zinc slag attached to the bottom of the groove on the surface of the sinking roller, and along with the operation of the production line, the zinc slag will accumulate at the bottom of the groove quickly, Once the zinc slag fills the groove, the zinc slag will scratch the surface of the galvanized steel sheet, and the sinking roller can no longer be used at this time, because the zinc slag accumulates quickly at the bottom of the groove, which will cause the sinking roller The defect of the short service life

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