Experiments And Analysis Of Laser-assisted Milling Process Of AerMet100 Steel

AerMet100 steel is one of the materials of choice for landing gear production due to its ultrahigh strength,high hardness,good resistance to stress corrosion cracking and fatigue resistance.However,AerMet100 steel is a typical aviation difficult-to-machine material,which is easy to cause problems such as easy to be adhered on tool face,low chip breaking,low tool life and frequent tool change during proces sing.The technology of laser-assisted milling(LAM)can make use of the thermal effect of the laser beam,so that the cutting area of the material to be processed is softened by heat,and the yield strength is reduced,thereby reducing the cutting force,reducing the tool wear rate,improving the processing efficiency,and improving the surface processing quality.In this paper,the laser-assisted milling experimental platform was built,the related basic experimental researches on laser-assisted milling of AerMet100 steel were carried out.The effects of laser power,spindle speed and feed per tooth on the laser-assisted milling three-way cutting forces,machined surface quality and chip morphology of AeroMet100 steel are analyzed.In addition,the tool lives of laser-assisted milling and conventional milling of AerMet100 steel are analyzed.The main research contents of this paper are as follows:AerMet100 steel laser-assisted milling experimental platform was built.The whole platform includes five-axis beam moving gantry machining center,laser preheating system and collimator position and posture adjustment device.For the experimental requirements of laser-assisted milling experiments on laser parameters,such as laser incident angle,laser spot size,and distance between laser spot and tool,the collimator position and posture adjustment device was designed to adjust the laser parameters.The experimental researches on laser-assisted milling cutting force of AerMet100 steel were carried out,in order to analyze the influences of laser power,spindle speed and feed per tooth on the cutting force of laser-assisted milling of AerMet100 steel.In addition,the tool wear life comparison experiments of AerMet100 steel laser-assisted milling and conventional milling(CM)were carried out.The experimental results of laser-assisted milling and conventional milling tool wear life were explored and compared.The experimental results show that AerMet100 steel laser-assisted milling can effectively reduce cutting force and extend tool life compared to conventional milling.Surface integrity experiments for laser-assisted milling of AerMet100 steel,including observations of machined surface roughness and residual stress on the surface layer of the machined workpieces,and the effects of laser power,spindle speed and feed per tooth on the surface roughness of the machined surface of AerMet100 steel and the residual stress of the surface layer of the machined workpiece were analyzed.The experimental results prove that AerMet100 steel laser-assisted milling can improve the surface quality of the machined surface.