Vibration Analysis And Optimization Of Structure Of Workpiece Spindle System Of Direct Drive Gear-hobbing Machine

As the core of manufacturing, the capability and level of development of machinery manufacturing indicates the level of development of a country or region. And machinery manufacturing capacity will largely depend on the sophistication of machinery equipment. Cutting vibration is one of main factors, which restrict machining accuracy, processing efficiency, reliability and environmental protection. So, it is of great significance to enhance the Anti-vibration of machine. In recent years, Direct-drive Technology is increasingly used in Gear-hobbing machine, which provides a very favorable conditions and infrastructure for "High-Speed Hobbing," "High Precision Gear", "Hardened Cutting" and "Dry Cutting". Direct-drive Technology means that the two spindle part of the motor rotor directly drive mechanism without any rigid connection, and let the intermittent cutting force of gear-hobbing machine directly role in the spindle.That's why people say the anti-vibration design and optimization is especially more important to the Direct-drive . Based on the research of the structure of the YK3610 Direct-drive gear-hobbing machine, the article analyzed the dynamic characteristics of workpiece spindle system and optimized the structure of this system. The main contents include:â‘ The development trend of Gear-hobbing machine and the contents of this paper were introduced. The main research focus on the abroad and domestic applied research of Direct-drive workpiece spindle system.â‘¡Structural analysis and design. According to the layout of this Gear-hobbing machine, the structural characteristics and performance requirements of the direct drive work spindle system, the paper talked about the way to choose electrical components , the reseaon why false-axis and Angle encoder were used , and the selection, configuration, preload and lubrication of bearing, and how the system send the heating out. At the end , the structure was designed.â‘¢Static Characteristics of Workpiece Spindle system. A finite element model of Direct Drive Workpiece Spindle system was established. By changing its five important design factors, rules of static characteristics of this system has been analysised and controled, which is a necessary basis for the and the next step- analysis of the dynamic characteristics.â‘£Analysis of dynamic characteristic of the Workpiece Spindle system. Firstly, by drawing the hammer modal test , using MSC.Marc simulation software and FFT of Matlab, changing five main factors of Workpiece Spindle system, and then observe the trend of the first order natural frequency and the selected point's dynamic stiffness of spindle system. Then changing two design factors at the same time, the trend of the spindle system will tell: if the five single-design factor contect with each other or not. All the analysis results are summarized, which gave constructive ideas and structure optimization. Compared with the optimization one and the original one, the optimization results show that without significantly changing of the structure of the system, the dynamic stiffness of Workpiece Spindle system can be greatly improved.