Research On Cutting Force Of Titanium Alloy TC4 Based On Slip Line Fiel

The research in the field of metal cutting is old and new.With the continuous emergence of new materials and new processing methods,cutting force has always been the focus of research in the cutting process.At present,the empirical cutting force model is established by using the exponential function empirical formula method,the shear angle model theory and the slip line field theory,and the cutting force model is verified by cutting experiments and simulations.However,because the factors affecting the formation of cutting force include material properties,geometric parameters and material properties of cutting tools,and environmental factors,there is still no accurate theoretical formula for cutting force so far.TC4 titanium alloy is used in all walks of life due to its good material properties.Based on the TC4 titanium alloy as the research object,this paper deeply studies the cutting process and analyzes the changing law of the cutting force of the TC4 titanium alloy during the cutting process.Firstly,the contact state between the tool and the workpiece is analyzed based on the contact mechanics,the contact model of the cutting process of the tool is constructed,and the cutting force is deduced.The cylinder compression model and the plate compression model are used for theoretical research,and the inclined plate compression model is deduced.Three contact models are used to analyze the blunt circle contact,blunt circlerake face contact and steady-state cutting stage in the process of cutting tool,and based on this,the blunt circle contact cutting force model,blunt circle-rake face cutting are obtained.Force model and maximum cutting force model.Secondly,the slip line models of three contact states are established,and the slip line parameters of different tool geometric parameters and cutting parameters are solved based on the secondary development of Solid Works,and the slip line field is obtained by drawing.The dead zone and the shunt point in the cutting process are further analyzed,and the area of the dead zone and the coordinates of the shunt point are derived.Finally,the theory is verified based on simulation and experiment.Using deform to simulate the cutting process of TC4,by extracting the surface contact stress at different stages and comparing with the theory,the stress distribution trend and value that are basically consistent with the theory are obtained.The theory applies to the rake angle between 0° and 20°,and the error value is larger when it exceeds 20°.At the same time,the coordinates of the shunt point are solved theoretically and verified in the simulation.The slip line model and cutting force are verified by cutting test,and the practicability of the theoretical model of cutting force and slip line model is verified.