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为提高错齿BTA钻头的钻削寿命与钻削孔的质量,采用Ti Al N涂层与未涂层错齿BTA钻头对核电管板进行深孔钻削试验。通过扫描电子显微镜观察钻头的磨损形貌、能谱仪分析失效钻头刀齿表面物质的结构,揭示错齿BTA钻头的磨损形式与机理。研究Ti Al N涂层对钻削核电管板错齿BTA钻头的钻削性能、钻削力、加工孔表面粗糙度、孔径偏差的影响。结果表明:错齿BTA钻头磨损最严重的是外齿与第1导向条,钻头的磨损主要以黏结磨损、扩散磨损和磨粒磨损为主,刀齿切削刃的磨损影响钻削力,外齿定径刃的磨损影响加工孔径,导向条的磨损影响加工孔壁的表面粗糙度;Ti Al N涂层使错齿BTA钻头的钻削能力提高2.8倍,减小钻削扭矩和扭矩值的波动,提高钻削孔的质量。
In order to improve the drilling life and the quality of the drilled holes of the bad tooth BTA drill, the deep hole drilling test of the nuclear power plate was carried out with the Ti Al N coating and the uncoated spatter BTA drill. The wear morphology of the drill bit was observed by scanning electron microscope. The structure of the tooth surface of the failed bit was analyzed by energy dispersive spectrometer, and the wear form and mechanism of the bad tooth BTA drill bit were revealed. The effect of Ti Al N coating on the drilling performance, drilling force, surface roughness of machined hole and the deviation of the hole diameter of BTA drill bit on the drill-core nuclear tube sheet was investigated. The results show that the wear of BTA drill is the most serious one. The wear of BTA drill is mainly composed of adhesive wear, diffusion wear and abrasive wear. The wear of cutting edge affects the drilling force, The wear of the scribing edge affects the processing aperture, and the wear of the guiding strip affects the surface roughness of the processing hole wall. The Ti Al N coating increases the drilling capacity of the wrong tooth BTA bit by 2.8 times and reduces the fluctuation of drilling torque and torque value , Improve the quality of drilling holes.