The Construction And Simulation Of Virtual Prototype For Horizontal CNC Spinning Machine Center

At present,the process of developing spinning equipment in China is the conceptual design,overall design,technical design,physical prototype trial and formal production.The equipment produced according to that process is difficult to meet the modern manufacturing demand with low cost and high efficiency.As an advanced technology for equipment research and development,virtual prototyping technology can evaluate and test the equipment in the virtual environment,reduce the dependence on the physical prototype,shorten the design cycle,reduce the cost of manufacturing and improve the performance of the equipment.Therefore,use virtual prototyping technology to develop the spinning equipment,carry out the dynamic and static simulation of the virtual prototype,which has important theoretical significance and application value for the development of the physical prototype of the spinning equipment.In this paper,the horizontal CNC spinning center was taken as the research object,combined with the flow spinning process of cylindrical parts,used the method of the virtual prototype simulation and the test,applied the finite element technology to the construction and simulation of the virtual prototype,studied the motion stability and resonance of the spinning center,checked the strength and stiffness of the key parts.The main contents and conclusions are as follows:The overall structure and working principle of the horizontal CNC spinning center were analyzed,the modeling of the components of each module and the assembly of the spinning center were completed by parameterized modeling and virtual assembly technology.The ANSYS finite element method was applied to the construction of the virtual prototype by ADAMS,and the multi rigid body virtual prototype model and the rigid flexible hybrid virtual prototype model were constructed.The dynamic characteristics of the virtual prototype were simulated and analyzed,checked whether there has interference in the spinning center during the motion process;compared the motion laws of the worktable and the transverse plate obtained by two different models;studied the influence of the spinning load on the driving power,and analyzed the influence of the driving speed on the stability of the motion.The results show that there has no interference phenomenon during the process of spinning forming;the rigid flexible hybrid virtual prototype model can reflect the motion situation more accurately than the multi rigid virtual prototype model;the maximum driving power of two operating conditions is less than the rated power of the servo motor.In the speed range of this paper,the greater the driving speed is,the more stable the worktable and the transverse plate motion is,which indicates that the stability of the spinning center's motion is better.On the ANSYS Workbench platform,the finite element model of the key parts of each module of the spinning center was built based on the finite element method.The static characteristic analysis and modal analysis were carried out,and the strength,stiffness,low order vibration mode and natural frequency of the key parts were studied.The results show that the strength and stiffness of each part can meet the design requirements and ensure that the spinning center has sufficient strength and stiffness;the lowest natural frequency of each part is far higher than the maximum external excitation frequency and the resonance phenomenon will not occur during the spinning process.Finally,the modal test method and the motion stability test method were applied to verify the virtual prototype of the spinning center.The results show that the natural frequencies of the tested bed,headstock and worktable are basically consistent with the modal analysis results,which verifies the reliability of the finite element model and the rationality of the finite element results.The greater the feed speed is,the better the motion stability of the spinning center is,and the error between the test results and the virtual prototype simulation results is about 12%,which verifies the reliability of the virtual prototype and the rationality of the simulation results.