Preparation And Grinding Experiment Of Electroplated Grinding Wheel For Laser Discrete Strengthening Of The Matrix With Ordered Micro-groove Structure

Electroplated super-abrasive grinding wheels are often used to grind hard and brittle materials such as quartz glass,engineering ceramics,and single-crystal silicon because of their wear resistance,high thermal conductivity,high processing efficiency and high processing accuracy.However,due to the poor coating/matrix bonding performance of traditional electroplated grinding wheels,the abrasive grains are likely to fall off prematurely,and even the coating peels off.Traditional structured grinding wheels are usually directly structured on the finish grinding wheel,which can easily lead to abrasive damage,processing shape and size characteristics.It is difficult to be consistent.To improve the bonding strength of the coating and the substrate,and avoid the problems of super-hard abrasive damage caused by direct structuring on the working surface of the grinding wheel,this study prepared a laser-discretely strengthened electroplated super-hard grinding wheel with an ordered micro-groove structure on the substrate,and carried out the Grinding experiment.The main research contents are as follows:(1)The effect of laser discrete strengthening on the bonding state of the 45 steel substrate/coating interface was studied.The results show that the laser discrete strengthening process makes the surface of the substrate form a periodic distribution structure of the original substrate area,the transition area and the laser strengthened area.There are a large number of cracks at the interface between the original matrix area and the coating,and the bonding state is poor;the bonding state of the transition zone and the coating interface has been improved;the laser strengthened area and the coating interface are tightly bonded,no cracks are found,and the bonding state is the best.(2)The preparation process of the electroplated grinding wheel with laser discrete strengthening and ordered microgroove structure is explored.The results show that the diameter of the electrode wire of the slow-moving wire cutting machine is ?0.1 mm,the ultraprecision discharge circuit and the slow wire-moving speed improve the shape accuracy of the microgrooves and reduce the surface roughness;during the slotting process,the hub is soaked in the working fluid,the thermal damage of the microgrooves is reduced.(3)Prepared the laser discrete strengthening of the matrix electroplating super-hard grinding wheel,and carried out the grinding comparison experiment.The experimental results show that the micro-groove structure reduces the effective contact arc length between the grinding wheel and the workpiece and the number of effective abrasive particles;the microgroove structure improves the working state of the grinding zone:increases the effective flow rate of the grinding fluid,and improves the lubrication of the grinding wheel and the workpiece.Under cooling conditions,the quality of the quartz surface after wet grinding is better.