Research On Thermal Field And Structural Parameters Optimization Of Vacuum Sintering Furnace Based On Modeling And Simulation

Vacuum sintering furnace is one of the important equipments in the powder metallurgy industry,and the demand has gradually increased in recent years.Internationally,the thermal efficiency level of the sintering furnace has reached about 60%,while the domestic thermal efficiency level of the sintering furnace is less than 35%,so that most of the purchase of sintering furnace equipment depends on imports.Therefore,the research work of high-efficiency and low-energy sintering furnace equipment has high application value in China.While improving the energy utilization efficiency of the sintering furnace,it is also necessary to consider the temperature uniformity in the furnace to ensure the quality of the workpiece.In order to solve this problem,this thesis studies the thermal field in the sintering furnace based on the finite element numerical simulation technology,Through the heat transfer analysis of the sintering furnace processing stage,the energy efficiency model of the sintering furnace and the quality model of the workpiece were established,and the structural parameters of the vacuum sintering furnace were optimized.The main work contents are as follows:(1)Through the measurement results of the physical structure of the vacuum sintering furnace and the recording of the actual working conditions,combined with the relevant knowledge of heat transfer,the finite element model of the vacuum sintering furnace was established,and simulate the processing stage of silicon nitride workpiece.After verifying the thermal field cloud diagram in the sintering furnace and the temperature-increasing curve of the monitoring point,the reliability of the simulation work is ensured,which provides a good guidance for the subsequent optimization of the vacuum sintering furnace.(2)Combined with the principle of heat balance,the maximum energy efficiency ratio index of the vacuum sintering furnace is established,the temperature variability coefficient of the workpiece is used as the quality index of the temperature uniformity of the workpiece,and calculate the two index values under the original structure parameters of the vacuum sintering furnace as the reference object of the optimization results.Then,due to the spatial position of the heating body in the sintering furnace and the structure of the heating body are important factors that affect the thermal field in the sintering furnace,Therefore,the position parameters and structural composition of the heating body in the sintering furnace are used as variable factors,and the influence of each variable on the single factor of each index is explored.(3)According to the results of the single-factor influence law,the effective adjustment range of the heating body position parameters in the sintering furnace and the structural composition of the heating body are determined.The response surface optimization method is adopted,and the design of the experiment is carried out by Design-Expert software,The results of the experiment were analyzed by analysis of variance and regression,and finally the optimization results were confirmed after simulation verification.Compared with the relevant data under the original structure of the vacuum sintering furnace,the results show that the maximum energy efficiency of the sintering furnace is increased by 10.26%,and the temperature variability coefficient of the workpiece is increased by 7.17%.(4)In order to reduce the labor time cost for operators to obtain data related to the sintering furnace,based on the research results of the vacuum sintering furnace in this thesis,the MATLAB simulation platform was used to build a "vacuum sintering furnace simulation system".It provides a theoretical basis and technical reference for the energy efficiency optimization of vacuum sintering furnace.