The Thermal Equilibrium Analysis And Optimization Design Of Long Hot Nozzle Based On Numerical Analysis

In recent years hot runner injection techniques has been widely used in areas such as automotive, telecommunications, home appliances, medical treatment, and daily necessities, with a huge cost advantage, resulting in significant economic benefits, but the hot runner technology are still facing some problems in the production process. The first the hot nozzle gate can not be heated directly because the structural limitations, only by the hot nozzle body heat conduction heating, leading to the gate of the hot nozzle temperature than the low body temperature; second the gate next to the mold of the relatively low temperature, resulting in a lot of heat loss, causing the temperature of the gate to low. The lower gate temperature will affect the quality of the injection molding part, especially important to temperature-sensitive plastic materials, so it must be to optimize the thermal structure of the nozzle and the heating coil set, especially the long hot nozzle.This thesis is based on thermal analysis software with modern computer technology, the establishment of a computer simulation model, the use of CAE analysis platform-ANSYS Workbench numerical simulation on the whole heating process of the hot nozzle, obtaining the long hot runner nozzle whole heating temperature field and analysis the entire thermal affects fact of the nozzle temperature field to thermal equilibrium, Finally simulation analysis and experimental measurements on a variety of heating the thermal nozzle structure. According to the simulation analysis and experimental measurement data, summary of the temperature field of the long hot nozzle and the heating wire winding the relationship during the whole heating process, optimizing the thermal nozzle structure, especially long hot nozzle heating structure design.Firstly, by one case that the production (car bumper) simulation analysis, validation and evaluation the feasibility of the application CAE analysis to the hot runner systems and hot nozzle temperature. Analysis and improvement of through bumper thermal nozzle, to prove CAE analysis can basically reflect the hot nozzle temperature distribution, to provide some guidance and help for the design, production and manufacture of hot runner.By the simulation of the general situation hot nozzle, explore the relationship in between the power of heating coil, the winding method of the heating wire in the whole heating process of the hot nozzle, the structure form of the hot nozzle, hot nozzle in contact with the mold and other factors with the temperature field. Many factors one by one, by experiments to test the difference between the simulation analysis of the results of the simulation results and experimental data, to explore the main factors to affect the hot nozzle temperature field, thus improving the thermal design of the hot nozzle structure.At present, the hot runner has been widespread use in the country, but relatively few studies about their theory, the domestic hot runner suppliers provide mostly low-end products, the relative lack of product features and independent intellectual property rights, the domestic situation that hot runner products market has been monopolize by the few manufacturers of American and European countries has not changed. This article explore the structural design of hot runner heating hot runner temperature field and guide the design of the hot nozzle structure by CAE analysis, with some practical value.