Optimized Process Research Of Aluminous Nozzle Of Integral Hot Runner Systems

As the Chinese mold industry developing deeply, hot runner systems had became the most important part in the last years and the integral hot runner systems has been widely used in all walks of life. Nozzle is the core component of all the systems, but the nozzle designs mainly depend on the engineers’ experience and the result is that all the products lack of design standards, then leading to some molding weak points such as the plastic can’t normal injects and there is some plastic connect to the parts. All those will increase the cost and cycle of production. Face to the situation, it is necessary to take some measures like making the production process standards to prevent the phenomenon happens again.Thermal analysis plays a decisive part on the nozzle quality, it’s important and significance to improve the process. The finite element analysis software ANSYS workbench software is a means of heat balance analysis, though adjusting the different dates, Simulates the temperature field. Finding out the relationship between dates and temperature is good for us to improve the existing design methods and prevent the occurrence of hot nozzle forming defects. The main contents including:The ANSYS workbench heat transfer coefficient research. The heat transfer coefficient is the main effect factors on the thermal analysis simulation accuracy. It’s hard to find a direct measurement and testing equipment to analysis the coefficient so far. Research on the heat transfer coefficient is the first step to optimize the nozzle design, also is theoretical basis for further research. The result of that research can make up the blank in this field. Using the reverse method fits the simulated and actual working temperature to calculate the coefficient is the main way.The experiment proves the heat transfer coefficient research. Using the coefficient to the ANSYS workbench thermal simulate, then comparing the two results between simulated and actual working temperature, proves the coefficient correct and improving the process.The nozzle’s process optimizes research. There are three parts that affect the design of the nozzle:the thickness setting of the insulation layer; the rational allocation of heating ring; the nozzle gate structure design. The main methods of optimization:Explore the different thickness of the insulating layer and the temperature relationship and finding out the optimal thickness.ANSYS workbench steady-state thermal simulate though setting the different heating ring spacing, material, nozzle radial size. Summary the relationship between the three points, then make the processes standard.Explore the temperature control points to the cone type gate top distances and the gate contact height relationship. Making the gate’s structure design standard, reducing the defects of injection molding.