| During the barrel finishing process,the addition of liquid medium has a direct effect on the corrosion resistance,roughness,brightness and longevity of the workpiece.This is mainly because the liquid medium can play an anti-corrosion,surface activity,cooling and lubrication,bright and so on.therefore,the study of liquid media can improve the efficiency of barrel finishing,reduce the processing cost and improve the surface quality,which has important significance for barrel finishing of the promotion.In this paper,Fluent is used to simulate the flow field of solid-liquid coupling and combined with the experiment to investigate the effect of liquid medium on the flow field under different parameters and the effect of liquid medium on the processing effect.The main contents of this paper are as follows:1.By simulating the flow field of solid medium and solid-liquid coupling flow field and analyzed the flow field pressure,velocity and turbulence,and then,the solid flow field andIV solid-liquid flow field are verified by experiments.The results show that the flow velocity and pressure of the solid-liquid coupling flow field are smaller than that of the solid medium.The surface roughness of the solid medium is better than that of the solid-liquid coupling flow field,but the wear loss of the grinding block is too large and workpiece surface blackening occurs,so it is not easy to be used.2.Vertical centrifugal equipment transmission ratio will directly change the distribution of the flow field,and explore the optimal transmission ratio for the solid-liquid coupling flow field.The results show that the greater the transmission ratio,the greater the pressure of the flow field,the greater the speed,but taking into account the economic and feasibility and generally selected transmission ratio-1.3.Vertical and horizontal movement of the difference will inevitably lead to the difference between solid-liquid coupling flow field,through the simulation of the way to explore the vertical and horizontal differences.The simulation results show that Under the same parameters,the overall pressure of the horizontal centrifugal equipment is less than the vertical,vertical relative movement is more frequent,so the vertical centrifugal equipment compared to horizontal centrifugal equipment is more conducive to improve theefficiency of the barrel.4.The different shapes of the barrel can also cause changes in the flow field of the solid-liquid coupling.It is important to study the state of the flow field in the circular and polygonal barrel,and to analyze the optimal number of flow field edges,which is of great significance to further improve the processing efficiency.5.The effect of the physical properties of the liquid medium on the finishing of the barrel fininshing.The results show that when the content of liquid medium is higher than that of grinding block10 mm,15mm and 20 mm,the effect of processing is almost the same as that just submerged grinding block.Therefore,too much liquid medium has no obvious effect on the processing effect.In addition,the addition of surfactant SDBS,AES and CDEA(1:1)reduced the viscosity and density of liquid medium,but the change of viscosity and density was too small,which had little effect on the solid-liquid coupling flow field.6.Explore the concentration range of surfactants which is suitable for barrel finishing,and analyzed the mechanism of the surfactants.The experimental results show that the 4%concentration of SDBS satisfies the requirements of surface roughness,brightness and material removal rate of barrel finishing. |
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