| With the rapid development of modern manufacturing industry, China’s demand for high-performance computer numerical control(CNC) machine tools has been increasing.As the most common work holding, Machine tool CNC lathe power chuck is a interface between workpiece and the machine electric spindle. During the machining process, The vibration of spindle chuck directly affect the quality of parts, It has important practical significance to monitor and correct spindle chuck vibration for improve the performance of machine. However, the traditional test equipment has been unable to meet the diverse needs of modern industry, for it has many disadvantages, such as high cost, poor scalability and low degree of convenience. with the requirements of the national major science and technology projects- "high-end CNC machine and basic manufacturing equipment", This paper designs a machine power chuck comprehensive performance testing system. The system which is based on virtual instrument technology can achieve online monitoring and measuring of chuck balance and inertia moment.First,in this paper, the functional design of the measurement of dynamic balance, the measurement of inertia moment and virtual instrument technology is accomplished. The theory and key technology in measurement of balancing and inertia moment is in-depth studied. Then, a machine power chuck comprehensive performance test methods is designed and realized, and the system design is completed, including hardware platform structures and software system development.In the measurement of dynamic balance part, the balancing mathematical model of machine spindle power chuck based on influence coefficient method is completed to solve unbalance calculation, and effectively extract chuck vibration signals from the mixed signals. Based on these, we extract the chuck vibration amplitude and phase based on correlation analysis method and compare with traditional FFT method, it turns out that the correlation analysis method has good feasibility and extraction effect. In the measurement moment of inertia part, the traditional inertia moment measurement method has the disadvantage of remove the rotor and high requirements of the test environment. A new method of measurement of Chuck rotor inertia moment is proposed and the mathematicalreasoning is completed, which is based on freedom deceleration process of motor system.The software is developed based on the LabVIEW platform. Meanwhile, the corresponding SQL databases is constructed to achieve the off-line management system, query and analysis of measurement data.The two above big parts are integrated with database query part. According to functional requirements, users can achieve switching modules. In order to verify the feasibility of the integrated test system, the article was tested on the machine tool spindle simulation experiment station based on PC-DAQ virtual instrument system. The experiment proved that this system has better balancing effect, high accuracy of measurement inertia, reliable and practical. It has a certain engineering application value. |
PDF Full Text Request