| Gas-liquid pressurized cylinder as a pneumatic and hydraulic technology composite drive equipment,with pneumatic rapid positioning and hydraulic booster output characteristics.The integrated gas-liquid pressure cylinder is widely used in today's stamping field and has replaced conventional stamping equipment with its unique advantages of high efficiency,low energy consumption,low noise and low vibration.In Germany,Japan and other manufacturing powers are widely used.Domestic manufacturers due to the late start of the study and immature technology developed gas-liquid pressurized cylinder developed volume,high system complexity and low stability,it has become increasingly unable to meet the high-frequency,high performance and high reliability requirements.In this paper,in order to develop high-frequency high-reliability pressurized cylinder products,mainly carried out the following work:First,the development and application status of the domestic and foreign gas-liquid supercharging technology are introduced.The structure,working principle and key technologies of the integrated gas-liquid pressurized cylinder are also described.Second,in order to understand the dynamic characteristics of the gas-liquid pressurized cylinder,a mathematical model of the gas-liquid pressurized cylinder was established,and the transfer function of the gas-liquid pressurized cylinder was derived to provide theoretical guidance for simulation.Afterwards,based on the dynamic characteristics of the gas-liquid pressurized cylinder,a complete simulation model of the pressurized cylinder was built by AMESim software.The dynamic characteristics of the pressurizing cylinder and the time delay characteristics of the differential pressure reversing valve were analyzed.The detailed study of the cylinder stamping performance provides a reference.Then,through the simulation model of the gas-liquid pressurized cylinder,the purpose is to design high performance and high frequency.The effects of air source pressure and preload spring stiffness on the output performance of the pressurized cylinder were studied.And the influence of the over-flow area of the one-way throttle valve and stroke distance on the press frequency of the pressurized cylinder was studied.Studies have shown that the higher the drive pressure is,the greater the boost output of the booster cylinder,the greater the fluctuation of the oil chamber pressure,and the longer start time of the force stroke.Preload spring stiffness is too large to cause the compression volume of the hydraulic chamber to become smaller,and the punching pressure is greatly reduced.Considering that the preload spring needs to provide sufficient restoring force,an appropriate preload spring stiffness value is given.The longer the dead volume pressure relief time is,the longer the start time of the force stroke is.The stamp frequency distribution and selection principle are given to maximize the punching frequency.The time consuming of the rapid stroke and force stroke has a certain influence on the entire stamping cycle,and the combined frequency range of 50 mm to 170 mm for fast stroke and 2mm to 8mm for the force stroke is in the range of 100 to 109 beats/minute.Finally,to verify the accuracy of the overall simulation model and parameters.The LabVIEW performance test system of pressurized cylinder was built.The experimental value of high-pressure chamber was 38.9MPa and the stamping force was about 87000 N.The error between test value and theoretical value and AMESim simulation value are within 5%.At the same time,from the perspective of verifying the reliability life of pressurized cylinder.The reliability test platform of pressurized cylinder was built.The parameters of life test data were estimated by Weibull reliability analysis model.The average life expectancy of gas-liquid pressurized cylinder reached 22974000 times. |
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