Structure Simulation And Performance Research For Clamping Device Of Two-plate Injection Molding Machine

Injection machine is the main equipment of injection moulding, and clamping device is amain component to achive the injection function. With the development of hydraulic andelectrical control technology, and people’s increasing emphasis on the quality of injectionproducts, it’s necessary to develop safe and reliable, efficient and precise, high-performancelightweight clamping device. In this paper, the clamping device of BM120-E two-plateninjection molding machine was studied. Based on the theory of finite element simulation,combined with experimental testing methods, the structure and properties of two-platenclamping device were studied.Firstly, this paper described the main structural types of clamping device, thecorresponding advantages and disadvantages of current research progress and relatedtechnologies. It discussed the market prospects and development of two-platen injectionmolding machine. Secondly, in order to explore the distribution of deformation and stress onthe clamping state, based on the finite element method in contact problems, ANSYSWorkbench software was used to do static analysis on the clamping device of BM120-Etwo-platen injection molding machine. Meanwhile, according to the deformation condition ofthe closeing line, the whole stiffness model of the clamping device was established. Again,based on the static analysis results and actual usage, the rod was selected for the study offatigue reliability analysis. The result validated that the rod was relatively weak, and showedthe reason why the fatigue failure happened. Then, in order to improve the force situation ofrod, the improving of the clamping device’s stiffness was set as the primary goal, and someimportant components of the clamping device was optimized. Topology optimization wasutilized to the moving platen, optimization results showed that the maximum deformation ofimproved platen decreased by16.09%, and the percentage of material reduction was17.15%.Aimed at minimizing the amount of deformation, parameter optimization was utilized to thefixed platen. The result showed the optimized maximum deformation decreased by22.2%,and the value of maximum stress decreased by7.13%, but the amount of material increasedby8.62%. Since then, based on the national standard, platen parallel test was taken by laserinterferometry technology, and the law of relative deformation on the platens was summarized. Finally, the clamping characteristics of clamping unit was tested by Kistler collection system,the uniformity and repeatability of clamping force on the two-platen clamping device wasanalysed. The variation law of hydraulic clamping cylinder in a clamping cycle and itsinfluencing factors was also studied and evaluated.The above work provide the basis for the design and optimization of the inner looptwo-platen injection molding machine, and have practical significance for improving thetwo-platen clamping mechanism.