Experimental And Simulation Study On Ultrasonic Torsional Vibration Assisted Milling Of Amorphous Alloys

Amorphous alloys(also called metallic glass)is widely used in aerospace,military and micro-electromechanical fields,due to its high strength,hardness,low thermal expansion coefficient,strong corrosion resistance.But because of the high strength and hardness of the amorphous alloy,it is difficult to use the cutting method to process the forming.In this paper,the Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk amorphous alloy(Vitl)is taken as the research object,and the ultrasonic torsional vibration assisted milling of amorphous alloy is studied by combining simulation with experiment,which provides a new direction for the processing and forming of amorphous alloy.Based on the theory of motion trajectory of ultrasonic torsional vibration assisted milling,a two-dimensional equivalent simulation model is established.The milling force of ultrasonic torsional vibration assisted milling and conventional milling of amorphous alloy Vitl is studied by simulation.A test platform for cutting force,cutting temperature and surface roughness of amorphous alloys in conventional milling and ultrasonic torsional vibration assisted milling is built,including ultrasonic generator,vibration tool holder,dynamometer and infrared temperature measuring equipment.The influence of cutting parameters on cutting force,cutting temperature and surface roughness in ultrasonic torsional vibration assisted milling is studied.At the same time,the accuracy of the two-dimensional equivalent simulation model is tested.The orthogonal experiments on rotational speed,feed per tooth,back feed,amplitude and frequency are designed by simulation method.Mathematical prediction model of milling force in ultrasonic torsional vibration assisted milling of amorphous alloy is established.Multi-objective optimization was carried out with the objective of minimizing milling force and maximizing material removal rate.The optimal processing parameters for ultrasonic torsional vibration assisted milling of amorphous alloy were given.