Research On The Technology Of Ultrasonic Torsional Vibration Assisted Milling C/SiC Composites

Carbon fiber reinforced silicon carbide ceramic matrix composites (C/SiC composites)because of its high temperature resistance, wear resistance, high specific modulus,anti-corrosion and small quality, excellent performance, widely used in the aerospace industry,automobile industry, defense industry and other high-tech fields. But due to its highstrength,high hardness and anisotropy processing difficulties which made the traditionalcutting process is difficult to achieve high efficiency and high quality. Aiming at theseproblems, this paper presents applying the ultrasonic torsional vibration cutting processingtechnology which have studied on the ultrasonic torsional vibration milling C/SiC composites.Based on the experimental study on cutting force，machined surface quality,cutting tool wearand processing surface roughness, has been compared with traditional milling can effectivelyreduce the cutting force in machining process, improve the machined surface quality, andprovide a new direction for the precise and efficient processing of C/SiC composites.The kinematics model of ultrasonic torsional vibration is established based on thetraditional milling tool path, have analyzed the kinematics characteristics of the ultrasonictorsional vibration milling. Through the finite element simulation analysis show that thethree-dimensional cutting forces of ultrasonic torsional vibration milling C/SiC compositeswere less than the traditional milling C/SiC composites cutting forces.Ultrasonic torsional vibration milling experiment is established with the traditionalmilling, have analyzed the essential of the cutting force between the two kinds of processingmethods, Cutting elements are discussed (spindle speed, feed rate, depth of cutt) effects oncutting force in milling of C/SiC composites under the two processing methods.Studies showthat after applying ultrasonic torsional vibration the three-dimensional cutting forcesdecreased obviously compared with the traditional milling,the cutting force with the increaseof spindle speed decreases, along with the increase of feed speed and cutting depth becomesgreater.Through the analysis of the surface quality of the milling C/SiC composite between the two kinds of processing methods, showed that the ultrasonic torsional vibration method ofmilling surface deburring, edge collapse and other defects are suppressed efficiently, themachined surface quality is much better than traditional milling.Study on the ultrasonictorsional vibration effects on tool wear, obtained in under the action of the ultrasonic torsionalvibration the tool wear compare with traditional milling has been effectively improved.Experimental study on the surface roughness of ultrasonic torsional vibration millingC/SiC composites by means of single factor and response surface,the prediction model of theultrasonic torsional vibration milling surface roughness has been established, research showsthat the ultrasonic torsional vibration milling can reduce the surface roughness and depth ofcut is the most significant factor of affecting surface roughness in UTVM with spindle speed,feed rate being the second, the third.