Research On Monitoring Technology And Structural Optimum Design For Actuating Mechanism Of Large Die Casting Machine

In order to solve the problems existing in research work on large die casting machine,such as less research on quantification and optimum design of whole machine,low amplifying force coefficient of clamping mechanism,lack of design theory for injection mechanism and laggard real time control technique,this paper mainly focus on the research work of monitoring theory and structural optimum design for clamping mechanism,injection mechanism and real-time controlled injection system of the large die casting machine,taking LK TECH DCC 3000U large horizontal cold chamber die casting machine as the research object.The research work of this paper is based on the Talents Project Research on Real Time Control System of Large Die Casting Machine of Liaoning Province,and the Project A Movable Parameters Test and Analysis Platform Used in Die Casting Machine of Innovation Team in Colleges and Universities in Liaoning Province.The results of the dissertation are presented as follows:Using finite element analysis and virtual prototype technology,the strength of important element of locking Mechanism was analyzed,and the time history curves of main parameters and function values of position,velocity,acceleration,clamping force varying with the crank angle at any point were obtained;The characteristics of kinematics and dynamics of the important element of locking Mechanism were analyzed and studied,strictly following the actual needs of the die-casting equipment in the process of constructing the mathematical model,selecting the objective function and constraint conditions and choosing the design variables.The mode characteristics and thermal structure of the template of the locking Mechanism was analyzed,and the former 8th order mode of locking Mechanism was obtained using constant surface substructure method,and the weak anti-vibration area was recognized to avoid resonance phenomenon.The stress state of the corresponding template is analyzed quantitatively through the coupling characteristics of the thermal structure.Thus,the design defect of the locking Mechanism are avoided.Furthermore,theoretical basis for optimal design is provided.Through lightweight optimization design for template component,the impact vibration of clamping process and the stroke of the corresponding dynamic seat plate are decreased compared with not optimized system,and the corresponding clamping force,amplifying force coefficient and work efficiency are improved.The mechanical characteristics and model of injection mechanism of large die casting machine is analyzed,and the mechanical model of injection mechanism is established,and the relationship between constraint condition and the load is studied.Compared with the theoretical calculation value,the relative error of the finite element analysis data obtained in this paper are less than 14%and can fully meet the design requirements.The hardware and software of real-time controlled injection system based on chaos adaptive differential evolution algorithm were designed.The hardware design mainly includes three parts:analog input and output data acquisition,switch input and output sampling,the main control chip and its function extension;The main program of software design includes four parts:control module,communication module,data acquisition module and man-machine interface module.Finally,the functions of data display,curve display,alarm,historical data preservation of the entire monitoring system are implemented.