Research On Devices In Ultrasonic Longitudinal-torsional Vibration Helical Milling

Composite materials, titanium alloy, ceramic materials because of their superiorperformance have been widely used in aerospace structures. In the process of structureassembly, need processing a large number of connection holes on the parts. Thetraditional machining process is difficult to process and quality to meet the requirements.At home and abroad in recent years, the spiral milling hole technology was applied tothe hole machining of difficult to machine material, and obtained a better results. Inorder to further improve the accuracy and efficiency of hole on the hard processingmaterial system, this topic would be the ultrasonic vibration cutting technologyapplication in spiral milling hole, forming longitudinal compound torsional vibrationmilling hole this machining method. Through the kinematic analysis, analysis, thecharacteristics of the cutting process was studied in this paper. And the longitudinalcompound torsional vibration device was designed and experimental research.At first, established the kinematics model of longitudinal compound torsionalvibration milling hole, simulated and analyzed the trajectories of the cutting tool relativeto the workpiece and the influence of vibration parameters on the tip trajectory shape.According to the characteristics of cutting trajectory, and analyzed the compoundlongitudinal and torisional vibration milling process, established the mathematicalmodel of cutting thickness and cutting time ratio, and studied the influence law ofcutting parameters and vibration parameters on them, and provide the theoretical basisfor selecting suitable machining parameters.Based on longitudinal and torsional vibration milling hole theory analysis,designed the structure of the compound ultrasonic longitudinal and torsional vibrationsystem. First of all, based on the theory of one-dimensional longitudinal vibrationtransducer and horn model, designed a one-dimensional longitudinal ultrasonicvibration system, and carried on the simulation. On the basis of the one-dimensionalaxial structure, designed the longitudinal-torsional composite vibration amplitude withchute, and theoretically analyzed the causes of longitudinal compound torsionalvibration structure.In order to satisfy longitudinal torsion vibration parameters of the compositevibration amplitude, used the finite element method horn vibration characteristics wasanalyzed, according to the analysis results studied the structural parameters on thelongitudinal and torsional vibration the influence law of natural frequency and theinfluence law of the angle of the spiral groove of the amplitude. Finally, the optimization design was carried out on the structural parameters of the amplitude; sothat the structure of longitudinal and torsional vibration frequency is more close to thedesign value.Consider the practical application easy tool change and the reliability of theconnection, cutting tool and the connection mode of the amplitude is designed. Blade oflongitudinal and torsional vibration of the system dynamics analysis, and revisedaccording to the results of the analysis to the structure. Finally, an experimental study ofultrasonic longitudinal and torsional vibration system resonance frequency andamplitude, and the test results and simulation results are analyzed in comparison.