| The two-platen injection molding machine has been widely applied in the fields of medical supplies,food packaging and other fields due to its advantages of high mold clamping accuracy,stable and reliable performance,low pollution.However,the research and application of two-platen injection molding machines are mostly aimed at medium and large-scale deep-cavity products,while the machine dedicated to micro-precision products are less developed.Based on this,the clamping mechanism and hydraulic system of a clamping force of 1000 kN two-platen injection molding machine is designed in this paper.and the performance of clamping mechanism and hydraulic system are analyzed based on simulation software in order to improve the mold clamping accuracy,reduce energy consumption,improve efficiency of machine.The main work is as follows:(1)According to the requirements and design parameters,the clamping mechanism of two-platen injection molding machine with a clamping force of 1000 kN is designed,including:determining the structural scheme of the clamping mechanism.Platens,tie rods,cylinders and other key components of clamping mechanism are designed and calculated;The stress and deformation of the platens were analyzed based on ANSYS.According to the characteristics of stress and deformation,the structure of platens was optimized.The three-dimensional model of the two-platen clamping mechanism was established.(2)Three kinds of hydraulic power source systems are proposed for the mold clamping mechanism of the two-platen injection molding machine:quantitative pump + proportional pressure flow valve system,proportional variable pump system,quantitative pump + servo motor system.Simulation models of three different kinds of hydraulic systems were built based on AMESim to research the power and energy consumption.The energy consumption of three kinds of systems under the same parameters was compared and the energy saving effects were analyzed.(3)According to the requirements of the clamping device,the hydraulic circuit of actuators of the clamping mechanism are designed,including:The scheme of differential connection of hydraulic cylinder is adopted in the mold-moving circuit to increase the efficiency of the machine;Check valve of hydraulic control is adopted to keep pressure and Throttle valve + 2 position 2 port hydraulic control valve is adopted to release pressure.Hydraulic components are calculated and selected,and the principle diagram of the hydraulic system of the mold clamping mechanism is designed.(4)The simulation model of the hydraulic system of mold-clamping mechanism was built based on AMESim for the purpose of exploring system efficiency and mold clamping performance.The effect of the quality of platen,the length of the pipe on the response of the mold-moving,and the effect of the proportional coefficient Kp,the length of the pipe on response of mode-clamping pressurization and clamping pressure value were studied.The pressure-keeping circuit of the mold-clamping cylinder is also studied. |
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