Experimental Research On Vibration Characteristics And Surface Roughness Of Cutting GH4169 Under High Pressure Cooling

Ni-based superalloy have excellent mechanical properties and organizational stability in high-temperature environments,and are widely used in aerospace.However,nickel-based superalloys are typical difficult-to-machine materials.The existence of cutting vibration will not only affect the accuracy of the processed surface,but also reduce the production efficiency.With the development of auxiliary processing equipment,the use of high-pressure cooling technology can improve the machinability of difficult-to-machine materials.Therefore,this paper takes Ni-based superalloy GH4169 as the research object,and conducts experimental research on cutting vibration characteristics and surface roughness under high-pressure cooling,which is of great significance for improving cutting stability and processed surface quality.First,the cutting of Ni-based superalloy GH4169 under high-pressure cooling was conducted.The cutting force and cutting tool vibration signals were collected during the cutting process,and the processed surface roughness was measured.The significance of different factors on the cutting tool vibration characteristics and surface roughness was analyzed.Exploring the effects of different cutting quantities,tool geometry parameters and cooling pressure on tool vibration characteristics.Secondly,a theoretical analysis of the cutting vibration is carried out to establish a dynamic model for turning vibration;based on the test results,an empirical model for predicting the vibration acceleration of the cutting tool under high-pressure cooling is established.the relationship between cutting force and vibration characteristics are studied,the influence of chip sawtooth degree on the time-frequency characteristics of tool vibration,and the relationships between the characteristics of tool wear and tool vibration are studied.Thirdly,through theoretical analysis of workpiece surface roughness,combined with test results,regression analysis was used to establish a model for predicting surface roughness under high-pressure cooling,and to verify the accuracy of the model;explore the surface roughness caused by different cutting amounts,cooling conditions,cooling pressure,and tool geometry parameters The influence law of degree can provide a theoretical basis for cutting parameter optimization.Finally,explore the impact of tool vibration characteristics on surface roughness,and analyze the correlation between tool vibration characteristics and surface roughness;in order to achieve optimal cutting performance,tool vibration and surface roughness degree prediction model,based on the cutting amount and cooling pressure as constraints,with the minimum vibration acceleration of the tool,the best surface roughness and the maximum cutting efficiency as the optimization goals,the multi-objective genetic algorithm(NSGA-??)was used to optimize the cutting parameters reasonable cutting parameters.The above research results can provide a certain theoretical basis and technical support for efficient and high-quality cutting of Ni-based superalloy GH4169 under high pressure cooling.