Study On Cutting Heat And Temperature Prediction In Helical Milling For CFRP/Titanium

Due to their well properties, CFRP(the carbon fiber reinforced plastics) and titanium are highly attractive for use in the aircraft industry. In this paper, the investigations of the cutting heat and cutting temperature in helical milling for the CFRP and titanium were done.On the basis of the kinematics mechanism and the cutting principle of helical milling, two types of heat sources were presented, one was resulting from the peripheral cutting edge; the later one was resulting from the bottom cutting edge. The stationary coordinate established in the hole and the moving coordinate established in the heat source was studied, containing coordinate transformation and the trajectory of the moving coordinate. In order to calculate the heat generation in the cutting process, a cutting force model was presented.A heat transfer model was developed to investigate the temperature variations of the workpiece made by the CFRP materials in helical milling. The different heat conductivities were considered. Based on the analysis, unsteady state three-dimensional governing equation of heat transfer in CFRP workpiece with adiabatic boundary condition was proposed. The heat partition transferring into the workpiece was solved using the Conjugate Gradient Method. A series of tests of helical milling for CFRP were conducted, and the results generated from the tests agreed well with the data calculated by the model. The effects of different cutting parameters on the temperature rise also were investigated.A three-dimensional model of temperature predicting which describes the temperature distribution with the time variation in titanium during the helical milling process was presented. The non-homogeneous partial differential equation(PDE) containing heat source term was solved using the Green function approach. A series of experimental tails for Ti-6Al-4V were organized. The experimental results agreed well with the data calculated using the model. The effects of different cutting parameters on the temperature rise also were investigated.A mathematical model which describes the temperature distribution with the time variation in stack-ups of CFRP/titanium in helical milling was presented. A series of experimental tests for CFRP/Ti-6Al-4V were organized. The experimental results agreed well with the data calculated using the model.