| During the development of China's aviation industry,aluminum alloys are widely used in the field of aircraft manufacturing due to a series of excellent characteristics such as low density,easy processing,good reliability,and good corrosion resistance.However,due to the influence of the material's own properties,robotic drilling of aluminum alloy laminated components is prone to hole defects such as burrs,which seriously affects assembly accuracy and efficiency.To this end,this article uses robotic rotary ultrasonic drilling technology to achieve its high-efficiency and high-quality machining,and proposes a calculation method based on robotic rotary ultrasonic drilling burr height in a weak stiffness environment.Based on a systematic analysis of drilling force,drilling burr,and drilling process,a feasibility study of applying ultrasonic vibration-assisted drilling technology to the field of robotic drilling of aluminum alloy laminated components was carried out.The main research contents of this article are as follows(1)The research on the drilling burr of aluminum alloy laminated components by robot rotary ultrasonic drilling was carried out.The mechanism of burr generation during drilling was studied.The experimental research of robotic ultrasonic ultrasonic drilling of aluminum alloy laminated components was designed.The influence of machining parameters,ultrasonic current and robot posture on the drilling force and drilling burr height were analyzed.An empirical formula for the drilling force of the rotary ultrasonic drilling of aluminum alloy laminated members was established,and the calculation method of the drilling burr height was established by combining the classic thin plate bending theory and the energy method.Finally,a verification experiment was carried out,and the results show that the avera ge error of the calculation method is within 8%,which has high accuracy.(2)The optimization of the process parameters of robotic ultrasonic drilling of laminated aluminum alloy members was carried out.The principles and applicable scopes of several common process parameter optimization methods are analyzed.The particle swarm optimization algorithm is used as the optimization method in this paper and the optimization content and calculation process of the particle swarm algorithm are explained.With th e burr height as a constraint,an optimization mathematical model was established,and the optimal robotic rotary ultrasonic drilling process parameters that maximized the machining efficiency were obtained.Finally,based on the optimized process parameters,an optimization verification experiment was performed.The experimental results show that the drilling burrs around all the drilling holes meet the requirements of aviation manufacturers on the height of the burrs.The accuracy and feasibility of the optimization algorithm are clarified.(3)The research on the process planning of robotic rotary ultrasonic drilling of aluminum alloy laminated components based on burr suppression was carried out.Several common regional division methods and the corresponding most suitable bit travel route were studied,and the total drilling time was calculated under different process planning methods.Based on the maximum processing efficiency,the optimal area division method and the corresponding drilling path were selected.Finally,a comparison study of the total drilling time under various regional division methods,the results show that the total drilling time decreased by 7.9% compared with the time taken to process the entire area with a single parameter under the optimal process path planning. |
PDF Full Text Request