Research On A New Type Of Double Axis NC Milling Machine For PCB

With the rapid development of printed circuit board(PCB)which moving towards high density,fine multilayer,special function and high integration,the requirements for PCB machining accuracy and efficiency are higher and higher.PCB CNC milling machine is a special equipment for PCB forming process.The improvement of its precision and efficiency will greatly promote the development of PCB industry and even the electronic industry in China.Taking PCB CNC milling machine as the research object,this paper designs a new type of highprecision dual axis PCB CNC machine,analyzes its static and dynamic performance,rigid flexible coupling dynamics,and carries out topology optimization design of main parts according to the analysis results,so as to improve the accuracy of the machine.Firstly,the overall structure of the existing PCB CNC milling machine on the market is analyzed and compared,and a new type of double axis structure scheme is proposed,and the theoretical feasibility of the proposed structure scheme is analyzed.According to the actual working condition,the feed system and machine bed material are selected.The whole machine is modeled and checked for interference,which provides the model basis for topology optimization.Next,the static and dynamic performance of the main parts of the new dual axis PCB CNC milling machine is analyzed.Starting from the static analysis,modal analysis and harmonic response analysis,the maximum deformation and equivalent stress nephogram,the first five natural frequencies and vibration modes,and the frequency and vibration mode which have the greatest influence on the machining accuracy of the main parts in the static environment are obtained respectively,which provides theoretical data for the optimization and accurate optimization objectives.Then,the rigid flexible coupling dynamic simulation analysis of the whole machine is carried out.The whole machine model and the connection of various parts are simplified.The trapezoidal acceleration and deceleration diagram is used as the driving condition of the threeaxis to simulate the actual working condition of the tool setting action.The vibration of the tool and the vibration of the worktable are used to represent the vibration of the three-axis direction in the process of machine tool movement.According to the vibration situation,find out the main factors that affect the machining accuracy of the machine tool,and further establish the optimization target.Finally,according to the results of dynamic and static performance analysis and rigid flexible coupling simulation analysis,the topology optimization design of the main parts which seriously affect the machining accuracy is studied.According to the results of topology optimization,the corresponding optimization scheme is proposed,and the parts are redesigned.The results of static analysis,modal analysis and rigid flexible coupling dynamic analysis were compared to verify the rationality of the optimization scheme.The verification results show that the optimized milling machine not only reduces the weight of the whole machine,but also improves the performance of all aspects,which provides a theoretical basis for the development of the new dual axis PCB CNC milling machine.