Experimental Study On Modification Of Aero Engine Casing Cutting Tool By High Intensity Pulsed Ion Beam

The aero engine casing is an important bearing component of the engine.Although it is possible to improve machining accuracy and efficiency through the use of advanced machine tools and optimization of machining processes,due to the poor cutting performance of Chinese machining tools,the machining of engine casing is difficult and costly.So,how to improve the service life of domestic tools has become an urgent problem to be solved.In this paper,the modified method of high intense pulsed ion beam irradiation was used to explore the surface modification of the tool.The M05 and YBG202 cutting sample was irradiated by HIPIB at energy densities of 1.5J/cm~2,2.3J/cm~2 and 4.7J/cm~2 and shot number of1,5,10 pulses at TEMP-6 equipment.The experimental results show that,after irradiated by HIPIB,ablation holes and cracks appear on the surface of the sample,and the size of the hole will increase with the pulse energy and the shot number of irradiation increases,the depth of the hole will gradually decrease,the surface of sample gradually become smooth and dense,but with the sample surface deposition energy increased,the surface of sample will also produce micro-cracks,especially after irradiated by HIPIB at energy densities of 4.7J/cm~2 and shot number of 10 pulses,the crack defects are particularly obvious.After the irradiation,the surface micro-hardness of the sample increased a certain extent.After irradiated by HIPIB at energy densities of 2.3J/cm~2 and shot number of 5 pulses,the surface micro-hardness of M05tool sample increased from 2101.0HV to 2396.7HV,which was 14.1%higher than that before the irradiation.The surface micro-hardness of the YBG202 blade sample increased from1691.3 HV to 2112.4 HV,which was 24.9%higher.With the increase of energy densities and shot number,the surface micro-hardness of the sample will increase first and then decrease.After irradiated by HIPIB,there is a significant long-range hardening effect.The micro-hardness of the sample is obviously improved in the depth range of 30μm~50μm.After irradiated by HIPIB at energy densities of 4.7J/cm~2 and shot number of 10 pulses,the depth of the hardened layer can reach 150μm.After irradiation,ablation and remelting occurred on the surface of sample,the grain was refined and the structure was compact which made the friction coefficient and wear rate of the sample are greatly reduced.After irradiated,the surface of M05 sample become smooth and dense,the surface micro-hardness and wear resistance increased a certain extent,the cutting performance of M05 tool has been greatly improved.After irradiated by HIPIB,a lot of cracks appear on the surface of YBG202 sample and the cutting performance of the tool is not significantly improved.