Study On The Technology Of Steady Amplitude Output Of Triangular Blade For Ultrasonic Cutting Acoustic System

Honeycomb composite has widely used in aerospace,shipbuilding and other industries,as it has high rigidity,high strength,low density,high temperature flame retardant and other advantages.Honeycomb composite is anisotropic,which belongs to difficult-to-machine material.Ultrasonic machining effectively solves dust pollution,surface quality defects and other problems in traditional milling process.From the research,we find the output amplitude of acoustic system plays an important role in the machining quality.Due to the influence of temperature and cutting force,vibration is prone to decrease or stop vibration when it get serious,which has fatal impact on the processing of honeycomb composite.This requires that ultrasonic machining keep a constant amplitude as far as possible.Therefore,it is necessary to study the stability of the output amplitude of acoustic system.The output amplitude of acoustic system is closely related to the ultrasonic power,the quality of pointed knife,the length of pointed knife and cutting force.In this paper,the acoustic system of ultrasonic assisted machining with fixed amplitude is studied.The main research contents and achievements are as follows:(1)Ultrasonic acoustic system is analyzed theoretically through equivalent circuit method.The amplitude parameter relation is established,and the main influencing factors of the output amplitude of the acoustic system are analyzed.Firstly,the amplitude transformer with single shape is converted by equivalent network.On this basis,the equivalent network conversion of compound amplitude transformer is carried out to obtain the equivalent network.According to the Kirchhoff loop formula,the amplification coefficient expression formula of the compound amplitude transformer is acquired.Then,the transducer is theoretically analyzed based on equivalent circuit method.The expression formula which can get magnification factor of transducer is also calculated according to Kirchhoff’s loop formula.Finally,the amplitude parameter relation of ultrasonic acoustic system is obtained by combining the equation of simple harmonic motion.The main factors affecting the output amplitude of acoustic system are analyzed simultaneously based on the amplitude parameter relationship.It provides theoretical guidance for experimental research.(2)Acoustic components with pointed knives and amplitude transformer is analyzed through ABAQUS simulation software.To verify the theoretical analysis results,the influence of quality load and the length of the tool on the output amplitude of the acoustic system are analyzed qualitatively.Modal analysis and harmonic response analysis of different tool length and tool quality are carried out.The results show that the tool,which is a static load,suppresses the output amplitude of acoustic system components.It verifies the correctness of theoretical analysis from the view of static perspective.It is also found that the length of tool amplifies the output amplitude of system.It provides theoretical guidance for experimental research.(3)The relation between the amplitude of acoustic system and the length of tool,the quality of tool and ultrasonic power is built and discussed through amplitude experiment and data analysis,which can obtain and verify the corresponding relation model.It verifies the correctness of the theory and the simulation results.Firstly,the output amplitude test of ultrasonic acoustic system under no-load condition is designed.The effect of tool length,tool quality and ultrasonic power on the output amplitude of ultrasonic acoustic system is investigated.It verifies the correctness of the theory and the simulation results.Then,with the help of MATLAB,sample data is analyzed by multiple linear regression analysis.The relationship model between the output amplitude of ultrasonic acoustic system and tool length,tool quality and ultrasonic power supply is obtained.Based on that,conditioning model of ultrasonic power is obtained,which can get output amplitude of acoustic system for any specific tool.Finally,the regulation model is verified by arbitrarily selecting a tool(4)By study the experiment of cutting force and experiment of the output amplitude of acoustics system of ultrasonic with force load,establish and verify the output power adjustment model to set the amplitude in the process of ultrasonic machining.Firstly,experimental study on the cutting force of ultrasonic assisted machining NOMEX honeycomb composite is carried out by response surface methodology.The corresponding cutting force model is established accordingly.Then,the effect of cutting force on the output amplitude of acoustic system is studied by experiment of the output amplitude of acoustic system with force load.It verifies the correctness of theoretical analysis from dynamic load.Next,the experimental data were analyzed by MATLAB.Relationship model between output amplitude of acoustic system and ultrasonic power and cutting force is obtained.Combined with the cutting force model,the constant amplitude adjustment model of acoustic system is obtained.Finally,the model was validated by random selection of cutting force.The study of amplitude adjustment model provide theoretical guidance for the actual processing of amplitude adjustment.It also provides a practical guidance model for the ultrasonic power to achieve constant amplitude output in the process of processing.