Abstract
Currently, when magnesium alloy sheet is rolled, the method of controlling roll temperature is simple and inaccurate. Furthermore, roll temperature has a large influence on the quality of magnesium alloy sheet; therefore, a new model using circular fluid flow control roll temperature has been designed. A fluid heat transfer structure was designed, the heat transfer process model of the fluid heating roll was simplified, and the finite difference method was used to calculate the heat transfer process. Fluent software was used to simulate the fluid-solid coupling heat transfer, and both the trend and regularity of the temperature field in the heat transfer process were identified. The results show that the heating efficiency was much higher than traditional heating methods (when the fluid heat of the roll and temperature distribution of the roll surface was more uniform). Moreover, there was a bigger temperature difference between the input and the output, and after using reverse flow the temperature difference decreased. The axial and circumferential temperature distributions along the sheet were uniform. Both theoretical calculation results and numerical simulation results of the heat transfer between fluid and roll were compared. The error was 1.8%–12.3%, showing that the theoretical model can both forecast and regulate the temperature of the roll (for magnesium alloy sheets) in the rolling process.
Highlights
Magnesium alloy sheets have low density, good thermal conductivity, high specific strength and stiffness, desirable damping properties, and excellent electromagnetic shielding
In the rolling process of magnesium alloy sheets, the roll temperature has a large influence on plate quality [7]
4.2 Results Analysis of Numerical Simulation The heat transfer process under different velocities was simulated, and the temperature values of a, b, c, d and the temperature field of the roll were obtained, as shown in Figures 7, 8. This shows that the fluid heats the outside along the thermostat hole progressive layers
Summary
Magnesium alloy sheets have low density, good thermal conductivity, high specific strength and stiffness, desirable damping properties, and excellent electromagnetic shielding. They are widely used in the aviation, aerospace [1], automobile [2], high-speed rail, and electronics industries [3]. In the rolling process of magnesium alloy sheets, the roll temperature has a large influence on plate quality [7]. When the roll temperature is too low, the edges crack and surface cracking of the plate occurs. When the roll temperature is too high, the roll can become stuck [8, 9]. There is an urgent need to make an important breakthrough in the accurate control of roll temperature
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