Investigation on dynamic performance of ultra-precision flycutting machine tool based on virtual material method

Abstract

In the field of ultra-precision machining, the dynamic performance of ultra-precision equipment contributes a lot to the processing accuracy. In this paper, in order to study the dynamic performance of the flycutting machine tool, the virtual material method was adopted creatively to build a machine tool model. This method overcame the complexity of actual structure and obtained more accurate results than traditional methods. Subsequently, the finite element method was applied to analyze the dynamic performance of the virtual material model. Furthermore, the modal test for the flycutting machine tool was performed to verified the simulations by means of the one-point hitting and multi-point measurement. The simulation results indicate that the virtual material model has high comprehensive accuracy, of which the average error of natural frequency is 5.9% and errors are all less than 6% excepting the first order. Moreover, combined with the flycutting experiments, it can be found that the fifth order mode of machine tool contributes a lot to processing quality, which leads to the waviness of 53 mm on the machined surface directly because of the weak stiffness of beam-column joints. By increasing the stiffness of the key joints, the waviness can be eliminated, which greatly improves the surface quality of the workpiece.

Hybrid multibody system method for the dynamic analysis of an ultra‐precision fly‐cutting machine tool

“…Chen et al 8 proposed a simplified method based on FEM to study the interaction between the machining process and the quality of the machined surface to obtain the interaction relationships. An et al 9 integrated the virtual material method with FEM to investigate the dynamic performance of an ultra‐precision fly‐cutting machine tool. However, in all the FEM‐based dynamic analysis of machine tool systems, the orders of the global dynamic equations are so high that deriving and solving the equations are computationally expensive 10 …”

Research on the vibration model and vibration performance of cold orbital forging machines

“…Mei et al 24 set up an accurate dynamic model for the numerical control machine feed system, and conducted the experiment to verify accuracy of the dynamic model. An et al 25 adopted the virtual material method to build the flycutting machine model. Subsequently, the finite element method was applied to analyze the dynamic performance of the virtual material model.…”