Mold temperature control machine
In the application of injection mold
1, Daan Thai mold temperature control machine is based on the use of thermal fluids (water or heat transfer oil) to divide. In order to prevent overheating of the oil in the moderator heater, the machine uses a forced flow pumping system and the heater consists of a number of tube stacks with finned heating elements for diversion. Water-type mold temperature machine usually the maximum outlet temperature of 120 ℃. Oil type mold temperature machine for working temperature ≤ 200 ℃ occasions. On the basis of this machine, a high temperature water temperature machine was used, which allowed an outlet temperature of 180 ° C. Since the thermal conductivity of water was much better than that of the same temperature at temperatures above 90 ° C, So this machine has a prominent high-temperature work ability. In addition, there is a forced flow of the mold temperature machine, for safety reasons, this mold temperature design work temperature of 180 ℃ or more, the use of thermal oil.
2, Mold temperature control machinethe mold temperature control machine's main features include: the controller set the temperature and mold temperature consistent; affect the mold of the thermal factors can be directly measured and compensated. Normally, the mold temperature is better than the temperature through the control fluid. In addition, mold temperature control in the production process control in the repeatability is better. The third is joint control. Joint control is a combination of the above methods, which can simultaneously control the temperature of the fluid and mold. In the joint control, the temperature sensor in the mold position is extremely important, place the temperature sensor, you must consider the shape, structure and cooling channel location. In addition, the temperature sensor should be placed in the quality of the injection of a decisive role in the place. There are many ways to connect one or more mold temperature machines to the injection molding machine controller. From the operational, reliability and anti-interference to consider the use of digital interface, such as RS485. Between the control unit and the injection molding machine can transfer information through the software. Delta mold temperature machine can also be automatically controlled. The temperature in the control mold is not uniform and is also related to the time point in the injection cycle. The temperature of the mold cavity rises to its maximum after injection, where the hot melt encounters the cold wall of the mold cavity and minimizes the temperature when the part is removed. The role of the mold temperature machine is to keep the temperature constant between θ2min and θ2max, that is to prevent the temperature difference △ θw fluctuation in the production process or gap up and down. The following control methods apply to controlling the temperature of the mold: the control of fluid temperature is the most commonly used method, and the control accuracy can meet most of the requirements. Using this control method, the temperature of the controller and the mold temperature are not consistent; the mold temperature fluctuates considerably because the thermal factors that affect the mold are not directly measured and compensated. These factors include changes in injection cycle, injection rate, melting temperature and Room temperature. Followed by the mold temperature is the direct control. The method is to install the temperature inside the mold temperature sensor, which in the mold temperature control accuracy requirements are relatively high will be used.

Mold temperature control machine3, in the mold temperature control machine use, select the appropriate thermal conductivity fluid is critical. Water is used as a conductive fluid for economic, clean and easy to use. Once the temperature control circuit, such as a hose coupler, leaks, the effluent water can be discharged directly to the sewer. But the use of water as a conductive fluid water also has the disadvantage: the boiling point of water is low; according to the composition of water, it may corrode and fouling, causing pressure loss and mold and fluid heat exchange efficiency between the decline and so on. When using water as a heat transfer fluid, the following precautions should be taken: pre-treatment of the temperature control circuit with an anti-corrosion agent; a filter is used before the inlet; a water temperature machine and a mold are regularly cleaned with a rust remover. There is no water shortcoming when conducting heat. Oil boiling point is high, they can be used for temperatures higher than 300 ℃ or even higher case, but the heat transfer coefficient of heat transfer oil is only 1/3, so the oil temperature machine in the injection of water temperature is not widely used. The configuration of the D'Aant mold temperature machine and the use of the mold temperature machine should be based on the processing of the material, the weight of the mold, the required warm-up time and productivity kg / h to determine the comprehensive. When using the heat transfer oil, the operator must comply with the safety regulations: Do not place the mold temperature near the heat source stove; the joints use tapered leak-proof and temperature-resistant hose or hose; Temperature control circuit mold temperature machine, joints and mold with or without leakage, function is normal; regular replacement of heat transfer oil; should use synthetic oil, good thermal stability, coking tendency is small.

Mold temperature control machine4, followed by the mold temperature control 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 injection molded parts to set. From this point of view, the temperature control temperature of ± 1 ℃, can meet this need. 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. Effective control of the temperature of the mold temperature control system by the mold, mold temperature, thermal fluid composed of three parts. In order to ensure that heat can be added 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 injection molded parts. It can also shorten the cycle time, reduce product costs.

Mold temperature control machine5, the mold, the plastic (such as thermoplastic) to bring the heat through the heat radiation to the material and mold steel, convection through the convective heat transfer fluid. In addition, heat is transferred to the atmosphere and mold through heat radiation. Heat absorbed by the heat transfer fluid is removed by the mold temperature machine. Delta Delta temperature control temperature control accuracy can reach ± 1 ℃, for the thermal balance of the mold provides a great deal of reliability.
Daan Thai mold temperature machine using P.I.D temperature control system, in any operating state can maintain a stable mold temperature. The thermal balance control of injection molds The heat transfer of injection molding machines and molds is the key to the production of injection molded parts.

6, and for thermosetting plastics, the higher mold temperature usually reduces the cycle time and the time is determined by the time required for the part to cool. In addition, in the plastic processing, the higher the mold temperature will reduce the plasticizing time, reduce the number of cycles. Daan Thai mold temperature machine is mainly used in the mold heating and constant temperature, but also for other areas with the same needs. The purpose of controlling the temperature of the mold and the temperature of the mold on the injection molding The main purpose of controlling the mold temperature is to heat the mold to the working temperature, and the other is to keep the mold temperature constant at the working temperature. The above two points to do the success, you can optimize the cycle time, and thus ensure the stability of high-quality injection molding. Mold temperature will affect the surface quality, mobility, shrinkage, injection cycle and deformation, and several aspects. Mold temperature is too high or insufficient for different materials will bring different effects. For thermoplastics, the higher mold temperature usually improves surface quality and fluidity, but extends the cooling time and injection cycle. The lower mold temperature will reduce the shrinkage in the mold, but will increase the shrinkage of the molded parts after stripping

7, Da Aetai mold temperature control machine works:; controller to adjust the temperature of the hot fluid, which indirectly adjust 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 water pipe, until the heat fluid temperature, that is, the mold temperature back to the set value. It consists of water tank, heating and cooling system, power transmission system, liquid level control system and temperature sensor, injection port 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, if the mold temperature is below the set value, the controller will open the heater.