Research On The Grinding Of Structured Cylindrical Surface By The Grinding Wheel With Abrasive Phyllotactic Pattem

Structured dimple and rib surface can effectively reduce surface contact friction and the drag friction resistance in the fluid,thereby improving the friction and the movement performance of the part in the fluid.In order to obtain a specific structured surface,researchers mainly use processing methods such as imprinting,chemical etching,and laser processing.However,these processing methods may cause problems such as environmental pollution,inefficiency,and high cost in mass production or difficult to process materials.At present,superabrasive grinding wheel is one of the effective methods to solve the above problems,but the grinding process needs to rely on the manufacturing of engineered grinding wheel.Therefore,how to manufacture an engineered grinding wheel with a specific structure and clarify its grinding strategy and mechanism is the key to solve the problems of mass production and difficult to process materials.In this paper,the Phyllotactic arrangement,array arrangement and staged arrangement are applied to the manufacture of engineered grinding wheel.The engineered grinding wheels with different abrasive patterns are fabricated by electroplating.Firstly,the surface mathematical model and motion model of three engineered grinding wheels were established.The surface of the external Cylindrical workpieces ground by three grinding wheels was simulated by MATLAB.The generation of dimple,convex hulls and grooves,and the depth of grinding were discussed.The effect of the rotational speed ratio and the Phyllotactic coefficient on the surface topography of the workpiece are obtained;then the manufacturing process of the electroplated grinding wheel was analyzed and the engineered grinding wheel with different phyllotactic coefficients and different arrangements was fabricated.The principle,process and causes of the failure in the manufacturing process of the grinding wheel are discussed.Finally,the corresponding grinding experiment is designed.The cylindrical workpiece is ground with three kinds of grinding wheels and the surface morphology of the workpiece is observed with the corresponding instrument to verify the correctness of the simulation results.The results show that structured dimples and grooves can be machined using engineered grinding wheels.The size of the dimple is affected by the grinding depth and the rotational speed ratio.Among them,the grinding depth is the main influencing factor,and the rotational speed ratio is the secondary influencing factor.The deeper the grinding depth is,the larger the dimple length,width and depth are,the higher the height of burr is,about half of the grinding depth.The larger the rotational speed ratio is,the smaller the dimple size is;The axial arrangement of the dimple is affected by the phyllotactic coefficient.The larger the phyllotactic coefficient is,the sparser the dimple axial arrangement is;The circumferential arrangement of the dimple is affected by the rotational speed ratio.The higher the rotational speed ratio is,the denser the dimple circumferential arrangement is.Under the conditions of the same number of abrasives,including phyllotactic pattern array pattern and staggered pattern grinding wheel,the space utilization of the dimple surface by the grinding wheel with phyllotactic pattern is the largest,followed by the grinding wheel with staggered pattern,and finally the grinding wheel with array pattern.