Experimental Study And Numerical Simulation Of Cutting Surface Properties

In many production and processing methods,under certain conditions,a deformed layer will be formed on the surface of the processed workpiece.Such a deformed layer is very different from the substrate,and different material forms are different,especially in the field of dry and hard cutting.The microstructure is particularly important.Based on different materials of TA2,TC4,45 steel,40 CrNiMoA and GCr15,this paper uses single-factor method to carry out cutting test,make metallographic sample,obtain the thickness of the white layer in the surface layer of the workpiece,and combine finite element simulation to analyze each factor The effect on the thickness of the white layer and its changing trend,and the effects of cutting parameters and material composition on the formation and thickness of the white layer are explained based on the metal cutting principle,work-heat conversion,heat conduction theory,and phase transition theory of the material.(1)The surface microscopic characteristics of TA2 and TC4 were analyzed.The microstructure of TA2 and TC4 was very different,and the microstructure of TC4 was even smaller.When the velocity increases,the thickness of the processed surface metamorphic layer increases,but the effect on the surface microstructure is not obvious,when the speed is less than 136m/min,there is no obvious white layer.As the feed increases,the thickness of the metamorphic layer also increases.Compared with the velocity,the feed has less influence on the surface microstructure.(2)Analysis of 45 steel,40 CrNiMoA and GCr15 that dialogue the deepest impact layer thickness was on the cutting speed,and then the feeding.Turning effect of white layer thickness is minimized which relatives to the cutting speed and feed.Because the influence of cutting speed on cutting temperature is the largest,then followed by feeding,turning back.In addition,the three cutting parameters of the influence law of white layer thickness is roughly same that is a significant increase in first and then slower growth trend.Therefore they can choose different parameters to achieve control of the white layer thickness cutting parameter and improve the quality of the finished work surface.(3)From the material composition: it can be known that carbon C is the basic element for forming austenite and martensite.A high content produces more white layer structure,and it also has the largest effect on the formation of white layer.When the carbon content of the two materials is close,the more types of alloy elements and the larger the content,the better the overall performance of the materials.Therefore,the properties of materials can be determined by controlling the carbon content and the content and type of alloying elements to achieve different white layer thicknesses under the same cutting parameters,providing some reference for cutting.