RESEARCH ON STRUCTURE DYNAMIC OPTIMIZATION DESIGN OF NC GRINDER

摘要

Dynamic optimization design is the key issue to improve machining precision of the machine tool. The accurate finite element model (FEM) of the original numerical control (NC) grinder including dynamic model of combined surface was established based on the results via compared actually dynamic test with theoretical analysis, The method of sensitivity analysis was applied to optimize the layout and parameters of the strengthening ribs of parts. The technique of modal frequency separation was applied to keep frequency separation of the main parts one another, and the structure of the main parts was optimized. The result of dynamic optimization design shows that the first order natural frequency of the new grinder raises 17% compared with the original one, while the relative vibration displacement between head of the grinder and the work piece reduces 10% correspondingly. The grinding chatter marks are eliminated and the machining accuracy is greatly raised.