Cutting Mechanical Properties And Experimental Study Of High Strength Aviation Titanium Alloy TC21

With excellent properties,titanium alloy has been widely used in aerospace,defense,biomedical and Marine industries.However,most titanium alloy materials are difficult to process.Titanium alloy materials have many shortcomings in the process such as high temperature,tool wear fast,processing quality and efficiency are difficult to ensure etc.Therefore,the research of its cutting mechanism and machinability has become a hot topic in cutting technology.As a new type of titanium alloy with high strength,high toughness and high loss tolerance,titanium alloy TC21 has the advantages of high strength,high plasticity,high fracture toughness and low crack growth rate,and its comprehensive mechanical properties are very excellent,which is mainly used for the manufacture of important parts or key bearing components in aircraft that require high strength and durability.As a new material,the cutting mechanism and machinability of titanium alloy TC21 need to be further studied.In this paper,the cutting mechanism of TC21 titanium alloy is studied,the mechanical properties of titanium alloy are studied by combining the mechanics of materials and CAE technology,and the finite element model of TC21 cutting process simulation of titanium alloy is established.The cutting mechanism of titanium alloy TC21 is discussed by simulation and experiment,which laid a theoretical foundation for improving the machinability of titanium alloy TC21.Firstly,the properties and machining characteristics of titanium alloy are analyzed,and the research status and trend of metal cutting simulation are introduced.Secondly,the key techniques involved in the cutting finite element modeling of titanium alloy TC21 are described in detail,including explicit dynamic algorithm,material constitutive model,chip separation criterion,knifechip contact model and heat conduction model.Then,a series of mechanical properties experiments are carried out,including hardness test,composition test,high temperature tensile test,Hopkinson compression test,etc.,and Johnson-Cook material model of titanium alloy TC21 is established.An orthogonal cutting model of titanium alloy TC21 is established by the finite element method to study the chip forming mechanism.At the same time,a three-dimensional turning finite element model is established to simulate and analyze the turning process of titanium alloy.Finally,through a series of single factor milling force experiment study the influence of milling parameters on milling force,and multi-factor regression orthogonal experiment TC21 titanium alloy milling force prediction model is established,the finite element model for titanium alloy cutting provides authentication model and machining process parameters optimization and the reasonable selection of parameters laid a foundation.