Flow Control Of Tundish In Continuous Casting Of Amorphous Alloys

Amorphous alloy have many unique properties,such as excellent magnetic properties,wear resistance and high strength,hardness,etc.,which make them have good application prospects in many fields.The amorphous alloy continuous casting process is complex and in its infancy,and the existing process is limited to laboratory research.In this paper,for the self-developed bulk amorphous alloy slab continuous casting equipment,the flow model of the ladle dumping system,the alloy solidification process and the electromechanical control system are deeply studied.It is used to achieve the purpose that the flow rate of the ladle pouring into the tundish is consistent with the flow rate required for continuous casting.According to the actual production and technological requirements,the working principle of the pouring pouring system is expounded,and the characteristics of the pouring pouring system are analyzed.By establishing a mathematical model of the pouring process,the relationship between the alloy melt flow and the ladle rotation angle and angular velocity is obtained.On this basis,the variation law of the flow rate of the motor under the constant speed rotation is obtained,and the control conditions to be satisfied by the motor during constant flow pouring are analyzed.According to the structural characteristics of continuous casting equipment,a two-dimensional continuous casting slab heat flow coupling model is established,and zirconium-based amorphous alloy is selected as the research material to deal with the thermophysical parameters of zirconium-based amorphous alloy,numerical simulation of the continuous casting process of zirconium-based amorphous alloy was carried out using Fluent finite element analysis software,the temperature variation of the alloy melt solidification process under different initial pouring temperatures and slab thicknesses was obtained,and the maximum drawing rates under different initial conditions were determined according to the formation conditions of amorphous alloys.Using the finite element analysis software ANSYS,a three-dimensional ladle dumping model was established,and the flow field of the alloy melt entering the tundish during the constant flow dumping process was analyzed.Aiming at the requirements of high running precision and rich motion status of the ladle dumping system,a stepping motor control system with Mitsubishi PLC as the core is designed,the hardware is selected,the I/O port assignment of the system is determined,and the system is programmed to realize the motor rotates according to a specific speed curve.The constant flow pouring pouring system is experimentally researched,and the ladle rotation angle and speed during operation are monitored by the simulator software.The experimental results show that the pouring flow of the ladle is constant,which verifies the correctness of the mathematical model and the accuracy of the control system program.