Experimental Study On Surface Roughness And Cuting Force Of High Speed Cutting TC4Titanium Alloy

High speed cutting is one of the important advanced manufacturing technologies nowdays, having made great contributions to solving the problem of machining difficult-to-cut metals. Public spotlight has concentrated on the technology of high speed cutting titanium alloy with the application of titanium alloy in industrial areas becoming wider and wider.At present, in the study of high speed cutting titanium alloy, people mainly use the assembly tools with larger diameter, which can achieve higher linear velocity without high spindle speed and are used for efficiently machining large components with simple structure. However, the functional requirements lead to trend that components’structures become complicated, components tend to be irregular with more complex local geometric features, the assembly tools can’t complete the machining work of components with complex structures. Aiming at solving this practical problem of how to select the reasonable cutting parameters during high speed cutting titanium alloy, experimental study of high speed cutting TC4titanium alloy is done using integral tool with smaller diameter under the condition of high spindle speed in this paper.This paper mainly includes the following:Firstly, the influence rules of cutting parameters changes including spindle speed、 cutting depth、feed engagement to surface roughness are investigated during high speed cutting titanium alloy TC4based on the single factor experiment; Primary and secondary influence relation of cutting parameters to surface roughness is analysed through orthogonal experiment, and index prediction model of surface roughness is established. Mathematic optimization model is established, whose optimization objective is maximum material removal, and constraint conditions are detailed scopes of surface roughness and cutting parameters, parameter optimization is completed by means of genetic algorithm; Guided by optimization results, machining experiment of titanium alloy plane ribbed panel model is done and cutting efficiency is promoted a lot.Secondly, based on oblique cutting model as well as the force balance of cutting units, function expressions of Fx、Fy and Fz about frictional angle η、rake angle γ、 helix angle λ、shear angle φ are established by means of force decomposition and coordinate systems transformation. After integral computation of cuttgin height h, theoretical analytical models of Fx、Fy and Fz are built. The influence rules of cutting parameters changes to cutting forces are searched through single factor experiment, meanwhile, analysis and explaination about end edge and peripheral edge flank wear are completed.Finally, constant cross section curved surface experimental carrier whose generatrix is single cycle sine curve is designed and manufactured,7feature points are selected as study objects from machining path and the curvature features are defined; The influence rules of spindle speed changes to cutting forces are investigated through single factor experiment, then verification experiment choosing data from the best spindle speed range is done and the machining result shows good performance.As one aspect of high speed cutting titanium alloy fields, this paper has reference function for the research on the influence rules of cutting parameters as well as the problem how to optimize the cutting parameters.