Study On Surface Morphology Of Ti5553 And Its Influence On Friction Properties In Low Temperature Cutting With Liquid Nitrogen

With the rapid development of the machinery industry and the trend of advanced processing technology,the quality of processing components and products is becoming more and more demanding today.But titanium alloy can lead to cooling-phenomenon effectively,and can easily produce higher force and heat in the cutting process.Therefore,there are some shortcomings in the production process,such as low processing efficiency and poor processing quality.There rises series of problems during production process that how to optimize the cutting process,improve the surface morphology of the machined workpiece,and finally achieve the improvement of parts performance and friction and wear performance.In this paper,according to the processing characteristics of titanium alloy,wavelet decomposition is carried out by wavelet analysis to decompose the surface morphology of turning,and can get the datum of high frequency roughness,low frequency roughness and real turning surface roughness,and the reasons for the formation of the morphological characteristics of these three scales are analyzed.The influence of different machining conditions on turning surface is characterized by multi-scale three-dimensional roughness parameters.Finally,the friction and wear analysis of titanium alloy is carried out to observe the influence law of machining parameters on friction coefficient.Finish Ti5553 turning experiment.The turning samples under different cooling modes,cutting speed and feed conditions are obtained,then measure the surface of the specimen with a white light interferometer and extract the three-dimensional morphological image and data matrix.Provide data support for subsequent analysis.The surface morphology of turning is decomposed by multiple decomposition using wavelet function,The surface morphology characteristics of each reconstruction are analyzed,and finally the influence of different processing conditions on the reconstructed surface of each frequency band is discussed by mean square root deviation.According to the characteristics of turning surface,the selection of three-dimensional roughness parameters suitable for evaluating turning surface is carried out,and the three-dimensional roughness parameters obtained by different machining conditions are analyzed and discussed in many scales.In order to verify the real performance of different machining surfaces,the friction performance of turning surface is tested by UMT-3 reciprocating friction experiment machine.The variation of the friction coefficient of the off-cut surface under different processing conditions is compared,and the influence of the cutting speed on the friction characteristics of the machined surface under the condition of dry friction and lubrication friction is analyzed.The final integrated wavelet decomposition and three-dimensional roughness parameters are determined.When the cutting speed is V=70m/min,the feed rate is f=0.05mm/r.The surface quality of the surface treated by liquid nitrogen low temperature cooling is better.