Numerical Simulation And Experimental Study Of Ultrasonic Vibration Assisted Drilling Of Carbon Fiber Composite Material

In recent decades, carbon fiber-reinforced composite materials are widely used in aerospace,defense technology, automotive industry and medical fitness and other fields, which are applied to the field of aerospace carbon fiber composite material itself has a very high quality requirements,and has a very high precision in manufacturing. Traditional manufacturing is difficult to meet its requirements. Ultrasonic assisted machining is a new special processing method, it has reduced cutting force, cutting heat to improve the surface quality of the many advantages for cutting carbon fiber composite material. This paper reviews the necessity of working to improve the quality of the hole, the concept of ultrasonic vibration drilling technology, the basic principles of its characteristics,introduced the current research, pointed out that the technical problems and make their future research directions prospected.In this paper, the ultrasonic vibration drilling process system as the research object, the use of theoretical guidance, finite element simulation modeling, feasibility verification, application examples and comprehensive assessment of a combination of methods to analyze the ultrasonic vibration assisted cutting carbon fiber composite material in the process of cutting force variation analysis of carbon fiber composite material hole during the material removal process, the establishment of the ultrasonic vibration assisted drilling of carbon fiber composite finite element model, based on the evolution of carbon-fiber composite microstructure(fiber and matrix), the cutting process of machining parameters the relationship between the quality of the machined hole were studied; built of carbon fiber composites ultrasonic vibration assisted drilling experimental platform, analysis of carbon fiber composites ultrasonic vibration drilling each hole cutting parameters on the quality of exports. Have assisted by ultrasonic drilling comparative experiment and simulation conclusions are as follows:1) Under the same cutting data, cutting forces than conventional ultrasonic vibration assisted drilling drilling produced generally smaller, the quality of their processing is generally better;2) Under the same cutting parameters, ultrasonic vibration assisted drilling cutting force with ultrasonic vibration amplitude increased and then decreased, matrix cracking damage evolution of the first region-wide increases and then decreases, the outlet surface of the hole quality first deteriorate and then changed for the better, so the ultrasonic vibrations to higher quality holes should be the appropriate choice of the amplitude of the secondary drilling carbon fiber composite material;3) at the same spindle speed, feed rate increases, the cutting force increases, the more seriousthe base damage, the more severe the defect surface quality of the hole appeared; at the same feed rate, spindle speed with improve the cutting force is reduced, the less damage to the substrate, the better the quality of the exit surface of the hole;In the process of drilling hole made of carbon fiber composite material in which its axial cutting force size will affect the quality of the machined hole, the smaller the cutting force working out of the hole exit surface quality is better, the worse the contrary.