| Nickel-based powder metallurgy superalloy has high temperature strength, good thermal stability and hot corrosion, which has been widely used in the aerospace field. Nickel-based powder metallurgy superalloy FGH97 has a high intensity, high hardness, conduct heat coefficient low and porous structure, it is a typical difficult-to-machine materials.Through accessing of drilling chip roots, drilling mechanism of nickel-based powder metallurgy superalloy was studied; Then finite element method and experimental were used for studying the drilling force, torque and drilling temperature in drilling nickel-based powder metallurgy superalloy; through changing drilling coefficient, emphasis studying and analyzing hard drilling nickel-based powder metallurgy superalloy the change rule of the machined surface roughness and hardness. Based on the drilling of nickel-based powder metallurgy superalloy experiments, the effect of cutting speed, feed on drilling deformation mechanism.Based on the drilling of nickel-base powder metallurgy superalloy FGH97 experiments, the effect of cutting speed, feed on cutting force, torque and drilling temperature were investigated. The experiment shows that: when feed in the range of 0.01-0.07mm/r, with the increase of the feed rate, the drilling force, torque and drilling temperature increase gradually; When drilling speed in the range of 0.01-0.07m/min, with the increase of the drilling speed, the drilling force and torque are little change; rapid increase in drilling temperature. Third Wave Advant Edge a kind of metal cutting professional simulation software can be used to analyze the drilling of nickel-based powder metallurgy superalloy. We also study the distribution of the temperature along with the main cutting edge. The results showed that the highest drilling temperature appears in the outer edge of the tool(The position of the tool prone to wear and tear.). By comparing the simulation results with the experimental results,the results show that: Although there are differences between the simulation results and the experimental results, their changing trends are consistent.Based on the drilling of nickel-based powder metallurgy superalloy FGH97 experiments, the effect of cutting speed, feed on the surface roughness and work hardening. With the increase in drilling speed, surface roughness of machined holes showing decreased first and then increased, and also the feed rate less affect of the holes roughness. With the increase in drilling speed, work hardening of machined holes showing decreased first and then increased, and work hardening rate is approximately 140%. According to the simulation optimization of drilling parameters,to conduct tests. Research shows that with the tool wear, the change of surface quality of the workpiece machining, when the tool flank wear volume of VB0.16 mm, the tool entering the rapid wear stage. |
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