The role and types of mold temperature machine mold temperature in the injection molding industry are as follows:
1. The main purpose of controlling mold temperature is:
1. Heat the mold to the working temperature 2. Keep the mold temperature constant at the working temperature.
The above two points can be achieved, and the cycle time can be optimized to ensure the stable high quality of the injection molded parts. Mold temperature affects surface quality, fluidity, shrinkage, injection cycle and deformation. Excessive or insufficient mold temperature can have different effects on different materials. For thermoplastics, higher mold temperatures generally improve surface quality and flow, but extend cooling time and injection cycle times. A lower mold temperature will reduce shrinkage in the mold, but will increase the shrinkage of the molded part after demolding. For thermoset plastics, a higher mold temperature typically reduces cycle time, and the time is determined by the time required to cool the part. In addition, in the processing of plastics, a higher mold temperature will also reduce the plasticizing time and reduce the number of cycles.
2. The type of mold temperature machine is divided according to the heat transfer fluid (water or heat transfer oil) used. The water-use mold temperature machine usually has a large outlet temperature of 95 °C. Use oil-operated mold temperature machine for working temperature ≥150 °C. Usually, the mold temperature machine with open water tank heating is suitable for water temperature machine or oil temperature machine. The large outlet temperature of Zui is 90 °C to 150 °C. The main feature of this mold temperature machine is simple design and economical price. On the basis of this machine, a high-temperature water temperature machine is used, which allows an outlet temperature of 160 ° C or higher. Since the temperature is higher than 90 ° C, the thermal conductivity of water is higher than that of the same temperature. A lot better, so this machine has outstanding high temperature working ability. In addition to the second, there is a forced flow mold temperature machine. For safety reasons, this mold temperature machine is designed to operate at a temperature above 150 ° C, using heat transfer oil. In order to prevent the oil in the mold heater from overheating, the machine uses a forced flow pumping system.
And the heater consists of a number of tubes stacked with finned heating elements for diversion.
3. The mold temperature machine is composed of a water tank, a heating and cooling system, a power transmission system, a liquid level control system, a temperature sensor, an injection port and the like.
Typically, the pump in the power transmission system causes the hot fluid to reach the mold from the tank with the built-in heater and cooler, and then from the mold back to the tank; the temperature sensor measures the temperature of the hot fluid and transmits the data to the control section. Controller; the controller adjusts the temperature of the hot fluid to indirectly adjust the temperature of the mold. If the mold temperature is in production and the temperature of the mold exceeds the set value of the controller, the controller opens the solenoid valve to open the inlet pipe until the temperature of the hot liquid, that is, the temperature of the mold returns to the set value. If the mold temperature is lower than the set value, the controller turns on the heater.
4. The thermal balance of the injection mold controls the heat transfer of the injection molding machine and the mold is the key to the production of injection molded parts. Inside the mold, heat from plastics (such as thermoplastics) is transferred to the steel of the material and the mold by heat radiation, and is transferred to the heat transfer fluid by convection. In addition, heat is transferred to the atmosphere and the formwork by thermal radiation. The heat absorbed by the heat transfer fluid is carried away by the mold temperature machine. The heat balance of the mold can be described as: P = Pm - Ps. Where P is the heat taken away by the mold temperature machine; Pm is the heat introduced by the plastic; Ps is the heat that the mold emits to the atmosphere.
The mold temperature machine produced by Kassel has been used in many injection molding industries.
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