The Research For All-Electric Hybrid-Driven Injection Molding Machine Clamping System

This thesis is based on the institutional parameter of AE80Series all-electric injection molding machine and hydraulic drive diagonally arranged seven-fulcrum double-toggle clamping mechanism models, and the design of five-fulcrum double-toggle all-electric injection molding machine, creating the new type of hybrid-drive seven-rod clamping mechanism, using ADAMS software to create virtual prototype model of hybrid-drive seven-rod clamping mechanism at a certain speed, completing the analysis of stability of speed of the movable platen clamping, analyzing flexible coupling performance of the moving plate, rods and toggles, researching kinematics and dynamics performance of three types of flexible bodies in an injection molding cycle. To obtain more comprehensive analysis results of the kinematics and dynamics performance of clamping mechanism, using MATLAB software to analyze and optimize stroke ratio and force amplification ratio of hybrid-drive seven-rod clamping mechanism.The results of the research of virtual prototype of hybrid-drive seven-rod clamping mechanism show that by setting certain drive functions of conventional motor and servo motor, in2.2s which is an injection molding cycle, the curve of speed of the moving platen is almost a sinusoidal curve, the growth of open-mold speed is steady, effectively control cracks and warpage of products due to excessive open-mold speed, initial open-mold speed of the mechanism is steady, verifying advantages of seven-rod mechanism which is strong compensatory speed and small inertial impaction.The results of research of flexible body of the movable platen showed that, due to inertia impact of the initial period of spotting stage, the actual rate of increase of the mold is slow in the initial period, the time of reaching the maximum speed of the movable platen has correspondingly delayed0.13s, but the maximum speed increased to some extent.The results of analysis of flexible body of rods showed that, ends of rods are stress concentration areas, fatigue life analysis should be used as the focus.The results of analysis of flexible body of toggles showed that, the hinged areas are stress concentration areas, rear bar and front bar are applied large forces, fatigue life analysis should be used as the focus.The results show that, the speed of opening and closing mold of hybrid-drive seven-toggle movable platen clamping mechanism is smooth, ensuring the quality of products, the maximum speed of shifting mode has been greatly improved. Stroke ratio of mechanism is better than five-toggle mechanism, the average speed of shifting mode has substantially increased, improving the efficiency of molding process, reducing the body size. Performance of force amplification ratio is better than five-toggle mechanism, being able to provide higher intensity clamping force.Innovative hybrid-drive seven-toggle clamping mechanism accords the characteristic which is, conventional motor provides large clamping force, servo motor is primarily responsible for outputting speed compensation, its larger force amplification ratio characteristic meets the large-scale developing trends of all-electric injection molding machines. The injection molding cycle is shorter, the size of mechanism itself is reduced compared with five-toggle mechanism, reaching the goals which are reduction of energy, materials and cost.