Research On Several Problems In The Design Of Topology Grinding Wheel For Structured Surface

The structured surface can effectively reduce the drag resistance of the fluid on the surface of the part,and thus improve the motion performance of the part in the fluid.In order to obtain the special structured surface,the researchers mainly used the embossing,chemical etching and laser processing methods,but these processing methods have some problems in mass production.Superhard Abrasive machining is one of the effective methods to solve the above problems,but grinding mainly depends on structured grinding wheel with specific surface structure So how to design and manufacture structured grinding wheel with special structure is the key to solve the above problems.In this paper,the existing topological characteristics of structured surface are studied,the topological properties are analyzed,and the grinding wheel is designed by extracting characteristic parameters.Firstly,the geometric and mathematical models of three kinds of cluster grinding wheels are established,and then the motion equations of structured grinding wheels are established by coordinate transformation,study the relationship between structured surface and grinding motion of grinding wheel.According to the kinematic equation,the boundary condition of structured surface is deduced,and the wheel spacing is deduced by using the characteristic parameters such as surface layout feature design and the design of each unit feature,the final design of structured grinding wheel.Matlab is used to simulate the surface of three kinds of grinding wheel,and the formation rule of the structured surface of dimples,boss and Groove is verified.The influence of the shape of abrasive cluster,the rotation speed of grinding wheel,the feed speed of workpiece and the grinding depth on the surface of workpiece is discussed.The morphologies of the structured surface of the workpiece under different parameters are discussed and analyzed,and the corresponding structured surface and its changing rules are obtained.At last,the grinding experiment is designed and the surface topography of the workpiece is observed and measured by the grinding wheel,which verifies the correctness of the simulation experiment.The experimental results show that the tructured surface can be machined by the structured grinding wheel designed and prepared according to the extracted topologicalfeatures;spherical crown,rectangular and frustum-shaped abrasive grain clusters were used in the experiment,and three types of abrasive grains were finally obtained.Structured surfaces with different cross-sectional shapes.When the grinding wheel speed is constant,the lower the workpiece feed speed,the greater the number of lateral dimples on the workpiece surface,and the smaller the lateral distance between the dimples.When the feed speed decreases to a certain value,the dimples are connected to form a groove surface.The greater the grinding depth,the greater the length,width,and depth of the dimples.The smaller the axial distance of the abrasive particle clusters on the structured grinding wheel with the misaligned arrangement and the phyllotaxy arrangement,the smaller the axial distance between the dimples.By selecting the appropriate grinding parameters,the surface of the convex hull can be obtained.