Study On Grinding Mechanism And Wear Resistance Of TiC Coating Micro-Abrasive Tools

With the continuous advancement of science and technology and the development of machinery manufacturing industry,miniaturization and precision has become the trend of equipment development,and precision machining technology has become the focus of attention of scholars.As a finishing machining technology,grinding can obtain high surface quality and plays a very important role in micro-scale machining process.The micro-abrasive particles grinded by traditional electroplated diamond micro-abrasive tool are only embedded in the binding agent.Meanwhile,due to the small tool diameter,the single abrasive particles needs to bear a large high-frequency impact in the grinding process,and abrasive particles are easy to fall off,which greatly affects the service life and surface quality of the micro-abrasive tool.At present,the common method to prolong the service life of the tool is coating on the surface.Based on this,the coating preparation parameters of TiC coating micro-abrasive tools were optimized by both experiments and software,and the grinding mechanism and wear resistance of TiC coating micro-abrasive tools were studied.At the same time,all aspects of the performance of the coating micro-abrasive tool prepared by using the optimized coating parameters were verified through experiments.The specific research contents are as follows:(1)Simulation study on coating parameters optimization of micro-abrasive tools:The influence of coating preparation process on coating quality was further studied,and the performance of TiC coating was comprehensively evaluated.The entropy weight transformation,genetic algorithm and other mathematical models were used to optimize the results of the previous single factor experiments.The optimized results were used to prepare the coating micro-abrasive tools,and the coating performances were compared in order to summarize the preparation process of the coating micro-abrasive tools.(2)Experimental study on grinding performance of the coating micro-abrasive tools:The grinding performance of the coating micro-abrasive tools was tested to investigate the influence of grinding force and workpiece surface quality on the grinding process.The effects of coating parameters,surface roughness,grinding speed,feed velocity,grinding depth,abrasive particle size and cooling condition on the machining quality were analyzed.The grinding force and the surface quality of the machined workpiece of the coating micro-abrasive tool prepared after optimizing the coating parameters by entropy weight transformation-genetic algorithm were compared in the grinding process in order to summarize the grinding performance of coating micro-abrasive tools,and optimized the grinding process parameters of coating micro-abrasive tools.(3)Simulation of grinding force and thermal characteristics of coating micro-abrasive tools:The special composite wear mechanism of coating diamond micro-abrasive tools was discussed by combining simulation with experiment,and the micro-damage model of single abrasive particle was established.Then the wear characteristics and rules of TiC coating micro-abrasive tools were analyzed,and the grinding mechanism of TiC coating diamond micro-abrasive tools was expounded.The grinding force/thermal finite element simulation model of coating micro-abrasive tools was established,and the distribution and variation law of grinding force/heat of coating micro-abrasive tools with different coating thickness under different grinding parameters were compared and analyzed.The influence of grinding force/heat on the machined surface was studied,and the validity and correctness of the simulation model were obtained by comparing with the experimental results.(4)Experimental study on the wear of coating and uncoating micro-abrasive tools:The wear test was studied by selecting different particle sizes of coating and uncoating micro-abrasive tools,and the regularity and the change of morphology in the micro-grinding wear process were summarized.The effect of TiC coating on slowing down wear and prolonging service life of micro-abrasive tools was studied.