| As components in injection mould, Hot runner system can be seen as an extention of injection molding machine. The purpose of an hot runner system is to feeds plasticised material into the cavity of the mould in a similar state to that in which it left the injection moulding machine nozzle. Different from the traditional cold runner gating system, hot runners has its own heating system or insulation to hold the the melt state during the processing. When open the mold, sprue removal needn't take out, and can be used in the next cycle time, so raised material utilization ratio. Hot runner technology is a revolution and an important direction of development in injection moulding and processing.As an advanced technology in injection molding industry, hot runner technology is developed and commercial applied by small number of well-known European and American companies, however the application of this technology is still at the stage of gradual promotion in our country. With great prospects and market potential, the development and application of hot runner technology is imperative. It is no doubt that the theory study of hot runner technology will improve far-ranging application and fast development, so as to fill the gap with the advanced country.One of the key points is to hold the hot runner system in a state of thermal equilibrium,which means that heat losses must be compensated for by heating. In the ideal case, an hot runner system will be in an isothermal state.Reference to a large number of information at home and abroad , the paper analyzed the power consumption and how to calculate the power demand. According to the principles of heat transfer, mathematical model of thermal equilibrium is established, and ANSYS software is to be used for the optimal layout of the heating element. According to the MCU regulator with PID control algorithms and sensitive thermocouples, the precision temperature control can be attained.
|
PDF Full Text Request