Geometric Model Of Microchannel In Grinding Area And Microdroplet Infiltration Mechanism And Experimental Verification

Grinding,as a basic machining method,usually uses cast cooling and lubrication.Due to the major strategy of the 14 th Five-Year Plan,the pouring type is no longer in line with green manufacturing and environment-friendly development.In order to alleviate the negative impact of pouring on the environment,the researchers conducted an experimental study on parameter optimization in the Minimum quantity lubrication(MQL)grinding method.However,in the grinding process,the geometry of the grinding zone has become a bottleneck hindering further research on the grinding mechanism and the infiltration mechanism of the MQL.The original problem of capillary penetration is difficult to solve.In view of the above problems,with the support of the National Natural Science Foundation of China,the random geometric model and motion model of a single abrasive particle were established;the grinding wheel model and the three-dimensional topography model of the workpiece surface were constructed;the formation mechanism of the capillary microchannels in the grinding zone was revealed.And established the model of the penetration velocity of the MQL,and obtained the penetration law of the liquid in the grinding zone under different working conditions through theory and experiment.The main contents of the paper are as follows:1.The stochastic geometric model and kinematics model of a single abrasive particle was established,and a surface topography prediction model of a workpiece ground by a single abrasive particle was constructed.The surface characteristic disorder of abrasive particles is simulated by establishing random plane equations,and the maximum cutting section of abrasive particles in the grinding process is extracted by matrix;the relative motion relationship between abrasive particles and workpiece is analyzed,and a single particle is established.The kinematic model of abrasive grains;the elastic deformation model of the grinding workpiece surface based on the Hertzian contact theory is established,and the prediction model of the surface morphology of the single abrasive grain grinding workpiece is obtained by numerical calculation.2.The geometric models of abrasive grains arranged in order were established,and the action mechanism of the grinding wheel with array arrangement and dislocation arrangement in the grinding process was analyzed.The prediction model of the surface topography of the grinding workpiece under different arrangements of abrasive grains is established,and the influence of the axial spacing of the abrasive grains and the circumferential distance of the abrasive grains on the surface topography of the grinding workpiece is analyzed.3.The geometric model of the grinding wheel with random arrangement of abrasive grains was established,the grinding mechanism of the grinding wheel in the grinding process was revealed,and the surface topography prediction model of the grinding workpiece was established.The three-dimensional topography model of the grinding wheel surface was established by the normal distribution model of the abrasive grain size and the random distribution model of the spatial position of the abrasive grains.The interference mechanism between particle motion trajectories was established and the prediction model and variation rule of workpiece surface morphology under different grinding parameters were established and analyzed.4.The geometric model of the capillary microchannel at the interface of the grinding wheel with different grinding wheel meshes is established,and the influence of the grinding wheel mesh on the cross-sectional size of the capillary microchannel is analyzed.The influence of different meshes of the grinding wheel/workpiece interface on the liquid penetration velocity in the microchannel was calculated and verified by experiments.5.Grinding experiments of high-temperature nickel-based alloy GH4169 under different grinding parameters were carried out,the influence of grinding wheel mesh number and grinding depth on the surface roughness of grinding workpiece was studied,and it was verified that under different grinding wheel mesh numbers and different grinding depths Three-dimensional topography prediction model of the workpiece surface.