Research On The Key Technology Of Laser Flat Laying Forming Equipment For Carbon Fiber Composite

The application of composite materials has gradually expanded from the field of aerospace to many fields of production and life in modern society.In order to improve the utilization and efficiency of materials and manufacture composite products with better performance,the research on Key Technologies of laser in-situ placement can greatly improve production efficiency and reduce energy consumption,which is of great significance to the development of aerospace field.In the past research,the method of heating with constant temperature hot air gun and matching with appropriate speed is more used.These methods are characterized by unstable laying and forming quality,small temperature difference between layers,serious energy consumption,difficulty in breaking through ultra-high temperature forming,and difficulty in online monitoring of forming point temperature.According to the experimental requirements of carbon fiber reinforced thermoplastic composite plate forming process,the laser-assisted heating and hydraulic roller rolling combined forming technology is proposed,and the laser plane laying forming system is designed and implemented.On the basis of summarizing the research status of thermoplastic carbon fiber composite laying and forming technology and equipment at home and abroad,this paper introduces the characteristics and forming theory of thermoplastic CF / PEEK composite,the principle of automatic laying control and laying path planning,and expounds the composition and working principle of carbon fiber composite laser plane laying and forming equipment.Using laser as the heat source,the laser plane laying equipment under the pressure of cold press roll is designed,and PLC control system is designed to realize the automatic laying of 300 N laying pressure and 300 mm * 300 mm laying range;the laser plane laying path is planned to solve the gap and overlap problem of plane laying composite materials;the mechanism of laser in-situ forming is analyzed to establish the automatic laying process of thermoplastic composite materials The two-dimensional mathematical model of laser heating temperature field is established to determine the heat transfer boundary conditions,and the temperature field simulation of different layers laying down is done with COMSOL finite element software;the temperature feedback control technology is proposed,the feedback control circuit and program are designed to realize laser heating with 0-500 w power,temperature measurement at 0-600?,PID parameters are modified,and the first layer laying experiment of forming temperature at 370? is carried out.The results show that the laying speed affects the stability of the forming temperature,the laying speed increases,and the temperature fluctuates greatly;the temperature control effect is closely related to the set PID parameters.By modifying the PID parameters,the laser control accuracy can be achieved ±10?,which solves the problem of the temperature accuracy of the laser plane ultra-high temperature laying,and provides the basis for the laser plane laying of high-performance carbon fiber composite plates.