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Thermal Balance Control Of Plastic Injection Mold
Jun 09, 2017

  Thermal balance control of Plastic Injection mold

  1, Plastic Injection mold thermal balance control Plastic Injection molding machine and mold heat conduction is the key to the production of Plastic Injection molding. Inside the mold, the heat from plastic (such as thermoplastics) is transferred to the material and mold steel by heat radiation and convected to the heat transfer fluid. In addition, heat is transferred to the atmosphere and mold through heat radiation. The heat absorbed by the heat transfer fluid is taken away by the mold temperature machine. The thermal balance of the mold can be described as: P = Pm-Ps. Where P is the heat from the mold temperature; Pm is the heat introduced by the plastic; Ps is the heat that the mold emits to the atmosphere.

  2, the effective control of the mold temperature of the preparation of temperature control system by the mold, mold temperature, thermal conductivity of three parts of the composition. In order to ensure that heat can be applied to the mold or removed, the system must meet the following conditions: First, inside the mold, the surface area of the cooling channel must be large enough to match the pump's capacity (pump pressure). The temperature distribution in the cavity has a significant effect on the deformation of the part and the internal pressure. Reasonable setting of the cooling channel can reduce the internal pressure, thereby improving the quality of the Plastic Injection molded parts. It can also shorten the cycle time, reduce product costs. Followed by the mold temperature machine must be able to make the temperature of the heat transfer fluid constant in the range of 1 ℃ -3 ℃, according to the specific requirements of Plastic Injection molding to set. The third is that the heat transfer fluid must have good thermal conductivity, the most important thing is that it can be introduced in a short time or derived a lot of heat. From the thermodynamic point of view, the water is better than oil.

  3, the working principle Mold temperature from the tank, heating and cooling system, power transmission system, liquid level control system and temperature sensors, injection and other components. Typically, the pump in the power transmission system causes the hot fluid to reach the mold from the tank containing the built-in heater and cooler and back from the mold to the tank; the temperature sensor measures the temperature of the hot fluid and transfers the data to the control section Controller; the controller adjusts the temperature of the hot fluid, thereby indirectly adjusting the temperature of the mold. If the mold temperature machine in the production, the mold temperature exceeds the controller set value, the controller will open the solenoid valve connected to the inlet pipe, until the heat fluid temperature, that is, the mold temperature back to the set value. If the mold temperature is below the set value, the controller will turn on the heater.