Grinding Performance Of Electroplated Superabrasive Grinding Wheel With Laser-discrete-quenched Substrate

The electroplated superabrasive grinding wheel has the advantages of simple preparation process,high processing precision,high grinding stiffness and strength,in the complex shape surface grinding is dominant.However,the poor bonding performance between the coating and the substrate is likely to cause the abrasives pull-out prematurely,or even the coating to flake off,which seriously affects the grinding performance and work life of the electroplated grinding wheel.In order to improve the bonding strength of the coating and the substrate,and reduce the abrasives pull-out,an electroplated superabrasive grinding wheel with laser-discrete-quenched substrate was proposed.The grinding performance of the new grinding wheel was studied by microscope observation experiment,hardness test and grinding experiment.The main research contents are as follows:(1)The effect of laser-discrete-quenched on the interfacial bonding state of 45 steel substrate/coating was studied.The results show that the laser discrete intensification process causes the substrate surface to form the periodic distribution structure of the original substrate region,the transition region and the laser quenched region.There are obvious differences between the bonding interface between laser quenched region,the transition region and the original substrate region and the nickel coating.The original substrate region/coating interface is rough,and there are a lot of cracks at the interface.The interface bonding state between the transition region and the coating was improved.The laser quenched region and the coating interface bond closely,did not find any cracks,the interface combination state is the best.(2)The hardness distribution of substrate/coating interface was studied and the effect of laser-discrete-quenched technology on the bearing capacity of substrate/coating interface was investigated.The results show that the average hardness of the laser quenched region/coating is 604.9HV,and the average hardness of the original substrate region/coating is 437.7hV.The laser-discrete-quenched technology can effectively improve the local hardness of the laser quenched region/coating and enhance the interface bearing capacity of the substrate/coating system.(3)Electroplated superabrasive grinding wheel with laser-discrete-quenched substrate was prepared,and a comparative experiment was carried out for grinding fused silica with quenched substrate grinding wheel and unquenched substrate grinding wheel.The variation law of grinding force and grinding wheel wear was studied.The experimental results show that:under the same grinding parameters,the actual grinding depth of laser-discrete-quenched substrate electroplated wheel is larger,resulting in greater grinding force.The results of observation on the working surface of grinding wheel show that the proportion of abrasive particles pull out the electroplated grinding wheel without laser-discrete-quenched substrate is up to 4%,while the proportion of abrasive particles pull out the laser-discrete-quenched substrate electroplated wheel dispersion is only 0.4%.The technology of laser-discrete-quenched substrate has a remarkable effect on the anchorage of abrasives.