Design Optimization Of Vehicle Paint Stirrer Andnumerical Control Machining Of Blade Mould

The rapid development of the automotive industry has led to a significant increase in vehicle production and sales,and the demand for automotive paints has increased.Vehicle paint mixing is an important part of its production process.The design optimization of mixing equipment and the research of processing methods have important theoretical and practical significance.The new paint mixer designed in this paper is optimized and improved on the basis of the standard Rushton disc turbine.Firstly,the three-dimensional structure model of the agitator and the mathematical model of the flow field are established,and the unstructured mesh of the agitator model is partitioned based on ICEM CFD.Then,the model is imported into ANSYS CFX,the finite element simulation model is established by using multiple reference system method,the control equation of the model and the discrete numerical solution of the pre-processing parameters are adopted by finite volume method,and the required data are extracted in the post-processing.The flow field information and mixing characteristics of the agitator are analyzed to pave the way for the optimization of the agitator structure.Secondly,based on the mathematical and hydrodynamic properties of the integrated spline curve,a new type of agitating blade surface is designed to analyze the influence of the blade torsion angle on the energy consumption,shearing rate and main convection diffusion ability of the mixing paddle;The parameters of twist angle are optimized by ideal point method and square sum method,and a better non-inferior solution is obtained.When the blade twist angle is 4 degrees,the agitating paddle has excellent overall performance.Thirdly,the other factors affecting the medium flow state and mixing effect in the agitator are analyzed,and their effects on mixing effect are explored from three aspects:bottom of agitator,baffle form and asymmetrical structure layout of blade.The agitating power,fluid velocity,flow direction and shear rate of different structure agitators are compared by using ANSYS CFX software.The results show that the bottom of streamlined butterfly tank helps to reduce power consumption;the baffle can eliminate swirling phenomenon and enhance shear rate,while slotting on the baffle can avoid the formation of dead zone between baffle and tank wall,reduce the formation of local eddy current circulation and improve the flow condition;the asymmetric structure layout can disturb the regular zone in the periodic flow and enhance the mixing effect.Finally,the processing method of impeller with optimized design is studied,and the casting method with low cost and suitable for mass production is selected to process curved blade parts.Using Mastercam software,the process of blade die processing is studied from three aspects: the design of blade die cavity,NC simulation tool path planning(including pocket roughing of integral surface,parallel milling and finishing of surrounding surface,shallow and steep inclined surface finishing of intermediate surface and final leftover finishing),and NC programming post-processing.In this paper,a new kind of curved blade of stirrer is designed,which is different from the regular curved blades such as plane blade,cylindrical blade and parabolic blade.The simulation results show that the comprehensive performance of the designed curved impeller is improved obviously.In addition,other factors affecting the mixing effect are systematically analyzed in this paper,which will provide some useful references for the design of stirrer in the future.