Investigation Of Non-sinusoidal Oscillator Of Continuous Casting Mold Driven By Double Sevomotors

Non-sinusoidal oscillation of mold is one of the key technologies to realize high efficient continuous casting.At present electro-hydraulic servo system is applied in non-sinusoidal oscillation both at home and abroad.But it is complex in system,expensive in investment,costly in operation and maintenance.So in this paper,the mold non-sinusoidal oscillation device driven by servo motor was studied;the device driven by double servo motor was designed.And a model of synchronous control was established.Then the dynamics simulation and Modal analysis for this oscillation device were carried out.Firstly,three kinds of non-sinusoidal oscillation curve(Demarc function,ellipse function,composite function)were compared and analyzed.The process parameters of Demarc oscillation function were mainly researched.Through the changes of basic parameters and process parameters,the synchronization control model is established.And the process parameters were calculated under different drawing speeds.Secondly,the load inertia and power of the motor were calculated to choose the suitable model of servo motor.Buffer spring stiffness and pre-stress were calculated,too.Using Solidworks to complete the assembly of the system and make the whole engineering drawing of the system.Thirdly,three-dimensional model of the oscillation device was established.The ANSYS and ADAMS are both used in dynamics simulation calculation to get the displacement,velocity,acceleration curve of the mold and the stress conditions of the leaf spring and bearing at the key part of the oscillation device.Finally,the mathematical model was carried out,and the free oscillation differential equation of the system was deduced by Lagrange differential equation.This provides a reliable basis for the following finite element simulation.The Modal analysis was carried out in ANSYS Workbench and the first ten order natural frequencies and their corresponding inherent oscillation modes were cut out.Finally come to a conclusion,the mold non-sinusoidal oscillation device driven by double servo motor can meet the requirements of continuous casting production practice.