Study on the Variation Mechanism of Geometric Shape of Dimple Surface on Topological Grinding
In order to reveal the geometric variation between the ground surface and the designed surface during the topological grinding process of the structural dimple drag reduction surface,the length of the dimple formed by topological grinding and the shape of the intermediate section were determined through the analysis of the relative motion state between the abrasive grains and verified by simulation.Firstly,the mathematical model of the spherical crown dimple was established and the middle section topology was transformed to obtain the intermediate section of the abrasive cluster.Secondly,the two parameters that af-fect the length of the grinding wheel abrasive grain cluster are determined,namely the radius of the grinding wheel matrix,the ratio of the grinding wheel speed to the workpiece feed rate,and the accurate mathemati-cal expression between the dimple length and the abrasive grain cluster length is established under the con-dition that the radius of the grinding wheel matrix is determined.Finally,the simulation experiment was de-signed,the speed ratio and grinding depth were changed to grind to obtain the dimple surface,and the inter-mediate section data were extracted to fit the curve and compare with the design dimple curve.The results show that under the condition of constant radius,when the correspondence between the length of the abrasive cluster and the speed ratio is satisfied,the surface shape of the dimple formed by the abrasive cluster is almost unchanged compared with the design shape,and the error is much smaller than that of the surface formed by other speed ratios,while the grinding depth is slightly shallow will reduce the dimple proportionally.
万方数据
维普
