The Research on the Cutting Test of Ni - Based Superalloy GH4169 and Optimization of Process Parameters under High Pressure Cooling

Abstract

Superalloy is one of the most important material in aerospace, shipbuilding and nuclear power industries. However, due to its excellent structure, its machinability is very poor. High pressure cooling is a new cooling technology, which provides technical support for cutting superalloy and other difficult-to-cut materials. Therefore, in view of the problem of poor machinability of superalloys, a cutting test on nickel-based superalloy GH4169 is conducted based on the high pressure cooling cutting technology in this paper. It is mainly to study the effects of different cutting parameters and coolant pressure on surface roughness and tool life. The results show that the feed has the greatest influence on surface roughness, followed by cutting depth and coolant pressure, and the least influence is cutting speed. Among the influences on tool life, cutting speed has the greatest influence on tool life, followed by feed and coolant pressure, and the least influence is cutting depth. Based on the adaptive genetic method, the prediction models of machined surface roughness and tool life of cutting GH4169 under high pressure cooling are established respectively, and the process optimization analysis is carried out with the goal of tool life, machined surface roughness and cutting efficiency. The optimal parameter combination is obtained as vc =163.75 m/min, f = 0.14 mm/r, ap =0.52 mm, P = 50.46 bar. The above research results can provide certain technical support for improving the machinability of superalloys.