Research On Hob-grinding Of The Drag Reduction Riblet Surface Of The Revolution Body

In recent years,most scholars are attracted by the excellent drag reduction performance of the riblet surface.At present,although there are many methods for processing the riblet surface,but the surface manufacturing of large quantities of parts or the surface of difficult-to-process materials is low in efficiency and high in cost.Especially in the aspect of processing the riblet surface on the surface of the revolution body,there is no efficient and low-cost processing method so far.Based on this situation,the method of grinding the riblet surface on the revolution body with the grinding wheel wound by diamond wire saw is proposed.In order to successfully use the wheel to process the riblet surface with drag reduction performance.According to the research done by researchers on the riblet surface in recent years,the result is summarized and organized,and the main parameters that affect the riblet surface drag reduction performance are extracted.The main parameters are the distance s between the two riblet units,the depth a_p of the riblet unit,and the ratio of depth to distance.Based on the analysis of topological attributes for the riblet surface.The topological transformation matrix of the general cylindrical riblets surface is established.A mathematical model of the arc-shaped cylindrical riblets surface is established.Then according to the riblet surface structure model,combined with the principle of gear grinding by the worm wheel,the structured topology grinding wheel is designed,and the new grinding wheel wound by diamond wire saw is designed.Then the trajectory equation of the workpiece grinding by the wheel is established,and the riblet surface of the revolution body is simulated based on the MATLAB platform.In the simulation research,the revolution body quadric surface is discretized,and the workpiece is separated into small grinding areas.The influence of speed ratio p_s of the grinding wheel to the workpiece,grinding depth a_p,and wire saw diameter on the cylindrical riblet surface formation is analyzed.At the same time,the forming mechanism of the cylindrical riblets surface is analyzed.The grinding wheel wound by diamond wire saw is manufactured and the cylindrical riblet surface is ground out with it.The results show that the speed ratio of the grinding wheel to the workpiece is equal to the number of riblet units on the processed riblet surface.The grinding depth and groove width of the riblet structure in different grinding areas on the quadric surface are reduced from the middle to the two sides.When the grinding wheel speed and grinding depth are constant,the distance between the two riblet units on the processed riblet surface is negatively correlated with the speed ratio.When the speed of the grinding wheel and the speed ratio are constant,the width of the groove in the riblet unit of the processed riblet surface is positively related to the grinding depth.The speed ratio p_s of the grinding wheel to the workpiece and the grinding depth a_p have an important effect on the grinding state during the forming process of the riblet surface.The surface abrasive particles of the wire saw have a certain effect on the roughness of the groove bottom of the riblet unit and the size of the undeformed chip,but it does not have much effect on the entire riblet surface.