Research On Dynamic Performance For Feeding Device Of CNC Based On DCG

High speed machine tool needs not only high spindle but also high feed speed to improve the machining efficiency. As an important part of numerical control machine tool, feeding device has a major impact on processing efficiency, machining accuracy and machining stability. So, it is significant to research on dynamic performance of feeding device.An optimum design is carried out for the feeding device of high speed machining center DVG850 based on the principle of driven at the center of gravity(DCG). Finite Element Method, motion simulation of Virtual Prototyping and Dynamic tests of three methods are adopted to study dynamic characteristics of single ball screw pair drive feeding device and double ball screw pair drive feeding device. The main contents in this paper are as follow:(1)According to the structure vibration equation, dynamic model of the feed unit workbench of DCG is established, and the expression of model response is obtained. Feeding device’s Driven-position and workbench’s vibration deformation have any analysis by the expression.(2)According to the design of indicators, the feed unit’s drive components are selected, and the model are established by Pro/E. Furthermore, numerical control machine tool 3 d model are completed, which feeding device have improved by the feed unit of DCG. In order to further provide structure dynamic performance, the key part of the double drive slider(X- sliding table) is carried on structural optimization. Take double drive driven slider sliding table(X-sliding table) for structural optimization, to further enhance the dynamic performance of the feed system;(3)The simplified single-driven or double-driven feed unit’s model modal analysis and harmonic response analysis are acquired by the ANSYS/Workbench software. Model of the theory of modal and amplitude response of sinusoidal disturbance force under the action of workbench surface some point, provide a reference basis for the next feeding devices.(4)The motion simulation analysis models using the multi-body method and the rigid-flexible coupling method were built in ADAMS and ANSYS software according to the multi-body system kinematics theory. The difference in driving torque variation and worktable vibration situation between single and double drive feed unit models was gotten.(5)The low-end frequency and corresponding deformation in the cases of single drive connection and double drive connection was tested based on MISO. The driving system vibration in the vertical direction was measured using the one-way accelerometer. The finite element analysis results has been confirmed though the test.