Study On Cutting Force And Tool Performance Evaluation Of Superalloy Under High-pressure Cooling

Superalloy is widely used in the processing of key parts such as aeroengine,ship and nuclear reactor,and plays an important role in the development of national military industry and civil industry.With the rapid development of China’s aerospace manufacturing industry,the demand for superalloy,especially nickel-based superalloy,is expanding.However,its cutting performance is poor.In the process of processing superalloy with PCBN tool,there are many problems,such as large cutting force,obvious vibration and serious tool wear,which affect the machined surface quality and cutting efficiency.High-pressure cooling is a new cooling method,which can effectively reduce the cutting force and tool wear.In this paper,PCBN tool machining superalloy under high-pressure cooling test,discussion on the changing law of cutting force and tool wear,and tool cutting performance evaluation,to explore efficient machining superalloy and improve the quality of the machined surface of the ideal program.Firstly,the cutting force prediction model under high-pressure cooling is established.According to the energy method and the projection relationship of cutting forces,the cutting force coefficient model related to cutting parameters and cutting tool angle is derived,and the conventional cutting force prediction model related to it is established.Based on the empirical formula of tool chip contact length and cutting force,the prediction model of tool stress distribution under high-pressure cooling is established.The empirical formulas of tool chip contact length and cutting force are substituted into the stress distribution model of conventional cutting tools,and the stress distribution prediction model of cutting tools under high-pressure cooling is established,which provides theoretical support for the subsequent simulation and experimental research of cutting superalloy under high-pressure cooling.Secondly,the cutting force and cutting tool stress of superalloy under high-pressure cooling are studied by finite element simulation.The finite element simulation model of conventional cutting and high-pressure cutting is established by Third Wave Advantagedge software.Based on the finite element simulation of tool chip contact length,the change rule of cutting force and tool stress under different cutting conditions under high-pressure cooling is analyzed,which provides certain technical reference for the cutting force test research of superalloy under high-pressure cooling.Thirdly,the cutting force and tool wear of superalloy under high-pressure cooling were studied.To explore the influence of cooling conditions,cutting parameters,geometric parameters and tool materials on cutting forces,and to verify the simulation results of cutting forces under high-pressure cooling;On the basis of comparative analysis of tool wear test results,the change rule of tool wear under different cutting conditions is obtained,which has practical significance and use value for the reasonable selection of cutting parameters and optimal design of tool geometric parameters.Finally,the cutting performance of the tool under high-pressure cooling is evaluated.By using the comprehensive fuzzy evaluation theory,a comprehensive fuzzy evaluation system of tool cutting performance under high-pressure cooling is established to optimize the tool material,cooling pressure,tool geometry and cutting parameters under high-pressure cooling,which provides a certain theoretical basis for improving the tool life under high-pressure cooling and efficiently machining superalloy.