Research On The Main Drive System Of The Servo Core Machine

As an important industrial equipment,core making machine is widely used in casting industry.Traditional core-making machine main drive system are mostly driven by hydraulic system,in order to get a larger driving force,ensure that the shoot sand and when you blow mould clamping force but because hydraulic drive maintenance trouble driving out of sync shortcomings,such as easy to make the sand core produces defects,this paper in order to improve the core making machine main drive control method,improve the quality of sand core,presents a with servo motor drive triangle toggle main drive system,and the kinematics dynamics and truss optimization and related experiments to do the research.In this thesis,a new type of main drive system for core-making machine is presented.by analyzing the deficiency of the existing main drive system,the design scheme of the servo motor driven upper triangular toggle mechanism for the main drive system of the new type core-making machine is determined according to the analysis of the structural characteristics of the core-making machine and the characteristics of different toggle mechanisms.For the upper triangular bracket drive mechanism,The forward and inverse kinematics mathematical models of the transmission mechanism are established by means of geometric relation.The forward and inverse kinematics solutions were obtained through MATLAB calculation,and the kinematics position,velocity and acceleration curves of the output link were obtained through simulation with the help of the simulation software ADAMS,which verified the correctness of kinematics characteristics.Main transmission system are analyzed in the force of the connecting rod,the static mathematical model is established,the function relation between the input and output,the force ratio calculated simulation,got the magnification when the mechanism moves to the end position.In addition,based on d ’alembert’s theorem,the force situation of each link of the triangular elbow is analyzed,and its dynamic mathematical model is established.The force and driving force of each hinge point are obtained,which verifies the correctness of the dynamic model and provides the mechanical basis for the subsequent optimization research.The simulation models of the mechanism with different sizes are established respectively,and the influence curves of the size of the single connecting rod on the position,velocity and acceleration of the output link are analyzed and obtained.In addition,the influence of the overall size and unilateral size change of the triangular toggle bar is also analyzed and studied,and the graph curve of the analysis result is obtained.parameterized model is set up,objective function to make the output force of maximum when the mechanism moves to the end position,calculated the sensitivity to the influence of each design variable on the target function,then in view of the high sensitivity of design variables,the optimization design,finally got the output the maximum output power,and the results compared with before optimization results,its magnification increased 2.75 times.Finally,the pressure head stroke,acceleration and output force of the main drive mechanism are studied experimentally.The experimental data of the above three parameters are obtained and compared with the theoretical curve.The conclusion that the experimental results are in good agreement with the theoretical analysis results is obtained,which verifies the correctness and feasibility of the above theoretical analysis.