Dynamic Model And Simulation Of Cold Ring Rolling Mill

Cold ring rolling is a high efficient rolling method for manufacturing such as seamless bearing rings, gear rings and other precise rings, which use the craft of continuous partial plastic deformation at room temperature. Cold ring rolling is of many characteristics such as energy saving and production cost, increasing utilization ratio of energy and material, rising productivity, widening processing range of ring products etc.The products of cold rolling ring have high accuracy, accordingly, the cold ring rolling mill as the core equipment should be precise. So the stability of rolling is to be one of the key problems to designing. The cold ring rolling mill should not only have satisfied kinematical performance, but also good dynamic drive and control performance. However, there is lake of accurate theoretical criterions for cold ring rolling mill design. Thus, this paper was proceeded theoretical analysis and simulation on characteristics of rolling equipment's dynamics and obtained the typical influence parameters which act on dynamic performances of cold ring rolling and expounded the law of how they act.According to the fundamentals of NC machine, classified the different system of cold ring rolling mill after analyzing its structure. Described the key parameters of academic molding and given the simplified suppose of dynamic model. On that basis, an equivalent dynamic model of the mechanical transmission structure of D56G90 cold ring rolling mill was built.The paper used MATLAB to simulate the dynamic performance of its mechanical transmission system. Analyzed the rapidity,stability and accuracy of feed system from the angle of mechanical kinetics.Then, expounded the key influencing factors of dynamic performance. Finally, carried out a libration test with different feed speed, gathered time-domain signal and analysed its operating laws, which certificated the feasibility of the test frame.The mechanical model of axial rigidity and torsional rigidity were established. Then, the effect of compress rigidity and torsional rigidity on feed error of feed system of cold ring rolling mill was analyzed. The analytical express of composite rigidity of servo feed system could make it possible to quantificationally analyze its rigidity, and verified the correctness of model through the ANSYS simulation, which pointed out the direction of design and improvement of servo feed system.Described the main structure of driven roll system and established the simulating model of the key part of spindle which added elastic element of bearing. In the paper, obtained the low-order natural frequency and mode of spindle through simulation and generalized the influencing laws about how bearing pretightening force act on the natural frequency and mode of spindle, which laid the foundation of vibration resistance analysis.