A spraying method for cold profile of horizontal centrifugal roll

Abstract

The invention discloses a spraying method of a horizontal centrifugal roller cold model. The spraying method is realized based on the existing horizontal centrifugal spraying equipment, and specifically comprises the following steps: A. placing a horizontal centrifugal roller cold model to be sprayed on a rotating machine, and adjusting a spray gun head at the center of a circle of the outer edge of the horizontal centrifugal roller cold model; B. adjusting the temperature of the horizontal centrifugal roller cold model to be 120-220 DEG C during spraying, adjusting the material spraying amount of the spray gun head to be 140-145g / s, and adjusting the traveling speed of a spray gun to be 20-40m / min; C. starting an electric motor to drive a spraying trolley, starting the rotating machine to rotate the horizontal centrifugal roller cold model at the same time, and spraying for 50-110 times. On the basis of the existing centrifugal roller spraying equipment, the inner wall of the horizontal centrifugal roller cold model is sprayed with a specific method, and the problem of nonuniform spraying caused by eccentricity can be effectively solved, so that the uniformity of the sprayed coating on inner wall of the cold model is improved by 60-80%.

Description

technical field [0001] The invention relates to a spraying method, in particular to a spraying method of a horizontal centrifugal roll cold type. Background technique [0002] For strip steel, the external dimensions include various precision indicators such as thickness, width, plate shape, plate convexity, and plane shape. Among all dimensional accuracy indicators, thickness control is one of the most important quality indicators for measuring plates and strips. The requirements for plate thickness control in various industries continue to increase. It is widely used in the production of plates and strips. The impact of the roll eccentricity has become an important part of the thickness control of high-precision rolling mills, and has become a focus of general attention in the metallurgical industry at home and abroad. [0003] Centrifugal cast iron rolls have gradually become the mainstream product in the market due to their excellent practical performance and good casti...

AI Technical Summary

Problems solved by technology

[0004] When the existing horizontal centrifugal spraying equipment is used to spray the short thick large horizontal centrifugal roll cold form, there are the following disadvantages: 1) Due to the large diameter of the cold form cavity and short length, the cold form is placed in the center of the axis of the rotating machine The height is different, and there is a defect that the position of the spray gun is low, which leads to the eccentricity of the spray gun, and the spray gun deviates from the center of the cold mold by about 200-300mm

During the spraying process, the cold mold is constantly rotating. If the position of the spray gun is lower than the central axis, the amount of paint sprayed on the top of the cold mold will be reduced. In addition to the gravity of the paint itself, the paint sprayed on the top of the cold mold will be more less, resulting in an increase in the thickness difference of the coating layer between the top and bottom of the cold profile, and finally forming a spiral thinner area on the inner wall of the cold profile, resulting in uneven spraying

2) During the spraying process, due to the different lengths of the cold mold and the inconsistent diameter of the inner cavity, the reciprocating stroke of the spray gun, the starting speed and the braking speed of the spray gun cannot meet the requirements of the spraying process, so the spray gun cannot enter the inner cavity of the cold mold. Spray effect

3) Due to the short start-up and braking time, the paint is easy to deposit, and it is easy to cause the clogging of the spray gun, so that the error of the coating thickness is too large, which affects the quality of the roll