Experimental Modal Analysis Of The VMC1060Vertical Machining Center

With the rapid development of the national economy, government departments attach great importance to basic industry which is supported by the manufacturing industry, the manufacturing industry of our country has made progress in technology change rapidly. As the workhorses, the machines also increasingly develop to the direction of high speed, high efficiency, precision and automation. Thus, the requirements of machining performance becomes higher and higher. Processing performance largely depends on the dynamic performance of machine tools. While the dynamic performance of the machine structure makes a great influence on machining precision, cutting efficiency, stability and reliability of the cutting. We often put the machine tool’s dynamic performance as an important index to measure the performance of the machine structure.As the main equipment of large box processing, the milling and boring machine is one of the very high precision requirements of mechanical equipment and its requirements for dynamic characteristics are more stringent. It is also used for processing screw thread, outer circle and end face in the factory. This paper takes a VMC1060vertical machining center produced by Yunnan Zheng Chenggong precise machine tool Co. LTD in Yuxi as research subjects. The research is based on the experimental modal analysis to study the dynamic performance. The main work focuses on the following aspects:In theory, the paper initiated discussions of modal analysis, parameter identification, signal analysis and test methods. The experiment system is established from the test sensor to the data acquisition instrument. It also discussed the equipment and its parameter setting. On this basis, we a dynamic test to VMC1060vertical machining center though picking-by-point response after a single point of pulse excitation. Then we conducted the modal parameter identification though frequency domain analytical methods. Finally, we found out the weak links of machine tool structure and provided the basis for the machine tool structure improvement.