Study On Non-sinusoidal Vibration System Of Continuous Casting Mold With Adjustable Amplitude Driven By Servo Motor

With the development of continuous casting production technology,the mold vibration technology of continuous casting is constantly upgraded and improved.At present,the traditional sinusoidal vibration technology has been basically replaced by non-sinusoidal vibration technology.Because the hydraulic servo or electric cylinder non-sinusoidal vibration system of high cost,maintenance difficulties and other shortcomings,so the servo motor drive mechanical non-sinusoidal vibration system is more and more attention,it has low cost,convenient maintenance and other advantages,but the amplitude of the mechanical non-sinusoidal vibration system is difficult to adjust.Therefore,a non-sinusoidal vibration technique of mold driven by servo motor with adjustable amplitude is proposed.The amplitude modulation is adjusted by adjusting the position of the moving fulcrum to solve the problem that the mechanical non-sinusoidal vibration system cannot be adjusted on line.In this paper,the vibration law of mold vibration,the design of vibration mechanism,the synchronous control model,the dynamic performance of the mechanism and the vibration process parameters are studied in detail,which lays a foundation for the popularization and application of non-sinusoidal vibration technology.Firstly,the realization principle of non-sinusoidal waveform is analyzed.The fivestage non-sinusoidal vibration waveform function is analyzed,and the rotational speed rule of servo motor under the five-stage vibration function is studied.The basic principle of nonsinusoidal oscillation system of mold driven by servo motor with mechanical amplitude adjustable is introduced.By changing the lever ratio of vibrator arm,the amplitude of mold can be adjusted online.Secondly,the non-sinusoidal vibration system of mold driven by servo motor with adjustable amplitude is designed.Draw the two-dimensional and three-dimensional diagram of the system,analyze the basic parameters of the connection points of the vibration system parts,calculate the hinge support force of each hinge fulcrum,and determine the selection of servo motor.The non-sinusoidal vibration parameters of the system are determined through the study of several synchronous control models.Finally,the modal analysis of the whole non-sinusoidal vibration system is carried out.The force of the guide plate spring was studied,and the dynamics model of the nonsinusoidal vibration system was established.The Lagrange differential equation related to mechanics was used for numerical calculation,the natural frequency of the system was studied,and the size of related parameters was further changed.The practicability of the system was verified by comparing with the experimental control group.