新型注塑机合模机构内循环工作机理研究

Injection molding machine is the key manufacturing equipment for aerospace, automobile, home appliances and other pillar industries of national economy. It is the most important machine to produce the plastic parts and more than 80% thermoplastic materials are injection molded. According to the requirements of high-precision, high-efficiency, energy-saving, a novel two-platen injection molding machine was proposed. Its innovation lies in the internal circulation mold-clamping cylinders in the clamping unit. The three dimensional numerical model and boundary condition of the internal circulation mold-clamping cylinder was built in this study. The model equations were solved by the Finite Volume Method and dynamic mesh and by selecting segregated solver of FLUENT according to CFD principles. The more accurate results of pressure field and velocity field in the cylinder during the mold-moving phase were obtained. The effects of mold-moving speed on the pressure field and velocity field were also investigated. The results can show the flow of the hydraulic oil in the internal circulation cylinder and provide theoretical direction for the design of the internal circulation clamping unit., and achieve rapid, accurate, and energy-saving operation of the injection molding machine.