The Research On Structural Characteristic And Dynamics Behavior Of Ultra High-speed Surface Grinding Machine Tool And Optimal Design

The ultra high-speed grinding is the current trend in grinding owing to its higher productive efficiency and lower surface roughness. Designing the ultra high-speed grinder of good performance is a principal condition.In this paper, the development of HSM technology at home and abroad, especially of the ultra high-speed grinding and the advanced methods for designing high-speed grinder are introduced, as well as the structural characteristic of the ultra speed-high speed grinder which is quiet different from the conventional ones, the technical line for developing the high-speed surface grinder, the structural performance requirement and some points designing its based structure of high rigidity. What's more, three methods to improve the dynamic behavior of the grinder are presented.In the current state of the art, calculation of static and dynamic behaviour of machine tools requires the modeling of the complete structure and components by the Finite Element Method. It is a good way to improve and optimize the machine tool's structure and develop new products, which is badly needed for developing ultra high-speed grinder because of its high speed and higher dynamic behaviour requirement. The ultra high-speed surface grinder which running at 150m/s is our research object. Firstly, its Finite Element Model of the complete machine is created, mode analysis is carried out, and then its several lowest natural frequencies and modeshapes are obtained. Secondly, for improving its vibration resistance ability, the bed structure must be improved according to the calculation results. Hence the improvement project of bed is put forward. In addition, the effect of the joint's parameters on the grinder's dynamics behavior is also involved in this paper.Aimed at the rigidity improvement of the bed and column, the effects of different structures are analyzed .By studies, it is indicated that better dynamic behavior can be obtained by reducing the number of windows and closing the lengthways ribs for bed and adding wings for column respectively. All these conclusions offer reliable foundations for the optimization design of structures of the ultra high-speed surface grinder.