1, the heat balance control of injection mold injection molding machine and mold thermal conductivity is the key to producing injection molded parts. Internal mold, made of plastic (such as thermoplastics) caused by thermal radiation heat transfer to the material and mold steel, heat conduction through the fluid circulating handed. In addition, the heat transfer by thermal radiation into the atmosphere and is mold. Thermal conductivity of the fluid is absorbed by the mold temperature to the heat away. Mold thermal equilibrium can be described as: P = Pm-Ps. Where P is the mold temperature away the heat; Pm plastic into heat; Ps emitted to the atmosphere to heat the mold.
2, the purpose of controlling mold temperature and mold temperature on the impact of injection molded parts injection molding process, the main purpose of mold temperature control of the mold is heated to one temperature, the second is to maintain a constant temperature in the mold temperature. The success of these two points do, you can optimize the cycle time, thereby ensuring the stability of high-quality injection molded parts. Mold temperature will affect the surface quality, liquidity, shrinkage, deformation and molding cycle aspects. Mold temperature too high or inadequate for the different materials will have different effects. Of thermoplastics, the mold temperature is usually a little higher will improve the surface quality and liquidity, but will extend the cooling time and injection molding cycle. Lower mold temperature will reduce the shrinkage in the mold, but will increase after the injection molding mold shrinkage. While thermosets, the higher mold temperature will usually reduce cycle time and cooling time from part time decision. In addition, plastic processing, the higher mold temperature will reduce the plasticizing time, reduce cycle times.
3, effective control of the preparation conditions of mold temperature control system consists of the mold temperature, mold temperature, heat transfer fluid of three parts. To ensure that heat can be added to the mold or removed parts of the system must meet the following conditions: first, in the mold inside the cooling channel surface area must be large enough in diameter to match the flow capacity of the pump (pump pressure). Cavity in the temperature distribution of parts deformation and internal pressure have a great impact. Reasonable to set the internal pressure of the cooling channel can be reduced, thus improving the quality of injection molded parts. It can also shorten the cycle time, reduce product cost. Followed by the mold temperature must be able to heat the fluid temperature constant at 1 deg -3 deg range, depending on the quality of injection molded parts required to be. The third is the thermal conductivity of the fluid must have good thermal conductivity, most importantly, it must be able to import or export in a short time a lot of heat. From the thermodynamic point of view, the water was significantly better than oil.
4, mold temperature machine works by the water tank, heating and cooling systems, power transmission systems, level control system and temperature sensors, sprue and other device components. Typically, power transmission systems in the thermal fluid from the pump with built-in heater and cooler tank to reach the mold, and then die back from the water tank; temperature sensors measure the fluid temperature and heat transfer to the control part of the data controller; controller regulates the temperature of hot fluid, and thus indirectly regulate the temperature of the mold. If the mold temperature in the production, the mold temperature exceeds the set value the controller, the controller will open the solenoid valve connected into the water, heat until the liquid temperature, mold temperature back to set that value. If the mold temperature is below the set value, the controller will turn on the heater.From Website
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