Research On Five-Wheel Continuous Casting Low Oxygen Copper Technology And Flow And Temperature Field Numerical Simulation

Copper rods for electricians are important basic materials for the production of wire and cable,enameled wire and electronic wire.They are widely used in power electronics,traffic information,mechanical construction and other fields.With the rapid development of industrial technology,higher requirements are p laced on the type and quality of copper rods.At present,the most advanced copper processing technology is the SCR continuous casting and rolling production line,and the five-wheel continuous casting is the core part.However,the solidification process of copper liquid involves multi-field coupling between temperature field,flow field and solidification field,and cross-action and common influence.This topic has studied the lack of theoretical guidance in the continuous casting stage,the occurrence of porosity and inclusion defects in copper billets.The main contents include:With reference to the principle of copper casting and wire casting technology,the value range of main process parameters was determined theoretically,and the carbon coating process was analyzed,and the optimization was improved in combination with the actual production situation.The determination of the cooling system water flow and the calculation of the spray cooling heat transfer coefficient were studied.The mathematical model of the spray heat transfer coefficient was established by fitting the experimental data,which provided theoretical support for the numerical simulation.The heat transfer of the copper liquid solidification process in the crystallization zone of the cavity was analyzed.To solve the complex interface heat transfer problem,the thermal resistance series model was introduced and the mathematical model of heat flow coupling was constructed.According to the established model,the numerical simulation of FLUENT was carried out to study the changes of the influence of different process parameters(casting temperature,casting speed,heat transfer coefficient and crystal wheel groove thickness)on the temperature field,flow field and freezing point position of the crystallization zone.The reference range of reasonable process parameters for five-wheel continuous casting low-oxygen copper technology is analyzed.The formation mechanism of the pores and inclusions in the copper billet was analyzed in detail.Based on the simulation,it is concluded that proper reduction of casting temperature and casting speed is beneficial to control the formation of pores and inclusion defects,and combined with actual production,specific improvement measures are proposed.Based on the numerical simulation,a feasible experimental scheme was developed,and a five-wheel continuous casting low-oxygen copper experiment was carried out using the SCR production line.The experimental results show that reducing the casting temperature and reducing the casting speed can reduce the formation of porosity defects in copper casting blanks,thus verifying the correctness of the process parameters of numerical simulation and theoretical analysis design.The optimal process parameter reference value is determined experimentally.