Passivation And Polishing Technology Of Rotary Abrasive Flow For Tap Tool And Its Experimental Study

The cutting tool is the basic processing tool in modern manufacturing industry,the cutting edge of the new grinding tool usually appears micro-crack,micro-bulge,serrated,damaged,burr and other defects,which seriously affect the cutting performance and service life of the tool.Especially,for tap,drill,milling cutter and other complex structure tools,faced with poor processing accessibility,incomplete deburring,cutting edge"excessive passivation"and other challenges,it has been an urgent problem in the industry to realize batch finishing with high quality,high efficiency and low cost.At present,for tool polishing deburring and edge passivation technology,enterprises put forward an urgent demand.Based on the above problems,a rotary abrasive flow tool passivation polishing technology was proposed in this paper,which carried out multi-dimensional and hierarchical research from the rotating abrasive flow processing principle,tool trajectory planning,material removal mechanism,abrasive medium optimization,passivation polishing test,process parameter optimization and other aspects.In this paper,based on the research status of tool passivation polishing at home and abroad and the process requirements of tool passivation polishing,starting from the traditional abrasive flow processing technology,the rotary abrasive flow processing technology and its principle are introduced.ADAMS software is used to plan the tool trajectory.The material removal mechanism in rotary abrasive flow machining was studied,and a single abrasive material removal model based on Preston equation and Vickers hardness method was established.The validity and adaptability of the rotary abrasive flow passivation polishing technology are proved by the feasibility test of tap tool passivation polishing.Based on the analysis of process feasibility test results and the requirements of tool deburring and cutting-edge passivation process,the passivation polishing process is optimized by optimizing abrasive medium,and the polishing deburring effect and cutting-edge preparation effect of abrasive medium and processing parameters are further tested.The experimental results show that GC abrasive medium has stronger edge passivation ability under the premise of ensuring cutting edge sharpness,but it is easy to produce the problem of the cutting edge"excessive passivation",while WS abrasive medium has better deburring effect.Finally,the tap was passivated and polished by multi-process composite processing.In the process of WS abrasive medium polishing deburring,the tool speed was 150r/min and the polishing time was 90s.The effect of different process parameters on the passivating polishing effect was studied by orthogonal experiments.The influence law and significance level of different process parameters on the radius of blunt circle were investigated.Based on the orthogonal test results and multiple nonlinear regression analysis method,the prediction model of blunt circle radius is established:R=0.151·S^0.519·t^0.336·w^0.310,and it can guide the optimization of passivation process parameters.Finally,the passivation and polishing effect and service life of the tap tool were tested by using the optimized process parameters.The results show that the blunt radius of the edge is less than 5μm,the average surface roughness Sa of the back surface is less than0.4μm,the edge is fully trimmed,the defects are significantly improved,the finish is significantly improved,the machining uniformity and consistency are better,and the tap life is increased by about 2.6 times compared with that before processing.The rotary abrasive flow passivation polishing technology has obtained the ideal tool processing effect,significantly improved the tool edge defects,improved the processing efficiency,to meet the industry requirements,has a high application value.