Research on the hottest spray rolling technology I

Research on spray rolling technology (I)

spray rolling technology is a thin strip continuous casting and rolling technology that integrates melt atomization, spray deposition and double roll casting and rolling into one, and directly prepares high-performance metal plates and strips from liquid metal in one step. It realizes the organic combination of high-efficiency, energy-saving and short process spray forming technology and rolling technology, which is in line with the direction of green manufacturing

the spray rolling process can be divided into two stages: (1) use inert gas (such as nitrogen) to atomize the molten metal into fine droplets (20~200um) through a linear nozzle. Due to different sizes of droplets, the relative error of thermodynamic performance of conducting or radiating heat transfer with the outside world during flight is also different: ± 0.5%, so the droplets can be solid, semi-solid or liquid, and finally deposited on the roll surface; (2) The deposited material with a certain solid fraction enters the roll gap for rolling densification, and heat conduction occurs in contact with the roll surface until it is completely solidified

compared with the traditional ingot metallurgy manufacturing method, the spray rolling processing method can save energy consumption, reduce costs, distribute solutes more evenly in the material structure, and have higher alloying strength. Compared with the double roll casting method, the spray rolling method does not use the water-cooled hollow roll to control the cooling rate, resulting in a mushy area, which can produce aluminum alloys with a wide solidification temperature range, while the double roll casting method cannot be used for the commercial production of 2124 and 7050 alloys. Compared with spray forming method, the porosity of the sheet produced by spray rolling is lower than that of spray forming sheet (2%~8%), which avoids cracking in the subsequent rolling process

the material prepared by spray rolling method has fine equiaxed crystal structure and high density. Due to the protection of inert gas, the oxygen content of the alloy is low, the alloy performance is greatly improved compared with conventional casting and forging materials, the process flow is short, and the energy utilization rate is high. According to the experimental method, it can be nearly finished, but it is only formed in 2013, but the equipment is complex, and the cost is still high