Study On Parameter Optimization Of Paper Honeycomb Ultrasonic Disc Cutting Tool Based On Genetic Algorithm

NOMEX honeycomb core has a series of characteristics,such as high specific strength and stiffness,great designability,excellent shock and anti-tremor performance,etc.It is widely used in aerospace field.The application of ultrasonic technology to the processing of honeycomb core material can avoid the defects of traditional processing methods effectively.But in the actual processing,ultrasonic cutting tools often appear serious disadvantages,such as serious wear and tear on the tool surface,high cutting force and cutting temperature,etc.It causes low life of the tool,hinder high quality and efficient processing of the honeycomb core material.Therefore,according to the problems of ultrasonic cutting processing,carry out study on geometric parameters optimization of ultrasonic disc cutting tool.The main work is summarized as follows:(1)Ultrasonic disc cutting tool is considered as the research object,develop modal analysis of ultrasonic cutting vibration system with cutting tools,carry out finite element simulation and tool's wear analysis of disc cutting tool ultrasonic cutting honeycomb core.Analysis the influence law of tool geometric parameters to the vibration frequency of ultrasonic cutting vibration system and cutting force,cutting temperature,tool wear rate of disc cutting tool.(2)A variety of experimental design methods are analyzed and compared,part of the factor design method is used to select the fitting sample point of each optimization goal numerical model.Use improved response surface method and two order polynomial stepwise regression method to fit each optimization goal numerical model respectively.Compare the accuracy of two methods and the results show that improved response surface numerical model is used to express the change of large disc cutting tool's 30 order and small circular cutting tool's 24 order vibration system vibration frequency and large disc cutting tool 's cutting force,cutting temperature and tool wear rate.Two order polynomial stepwise regression numerical model is used to express the change of large disc cutting tool 's 28 order and small circular cutting tool 's cutting force,cutting temperature and tool wear rate.(3)The relative importance and the range area's relative size of each optimization objectives are comprehensively considered.The proper weight coefficient are added to each optimization objectives respectively.Genetic algorithm optimization system is analyzed,construct tool geometric parameters optimization function of disc cutting tool.Use genetic algorithm to optimize geometric parameter and verify geometric parameters of the tool.The results show that the optimal tool geometry parameters of large disc cutting tool are tool diameter D=49.5mm,tool height H=4mm,tool front angle a =12°.The optimal tool geometry parameters of small circular cutting tool are tool diameter D=21mm,tool length L=31mm,tool front angle a =17°,tool rack angle,?=4°.The genetic algorithm optimization function value of large disc cutting tool is 1.196,the simulation verification optimization function value is 1.166,optimization error is 2.57%.The genetic algorithm optimization function value of small circular cutting tool is 1.003,the simulation verification optimization function value is 1.032,optimization error is 2.89%.