Mold temperature in injection mold Applications

5, the type of mold temperature is based on the use of heat transfer fluid (water or thermal oil) to the division. With the transport of water-type mold temperature is usually the maximum outlet temperature of 95 deg. With an oil-type mold temperature machine operating temperature deg 150 deg for the occasion. Under normal circumstances, with open water tank for heating the mold temperature machine with a water temperature or oil temperature machine, maximum outlet temperature of 90 deg to 150 deg, mold temperature of this unit’s main feature is designed to be simple and affordable. In this machine also derived on the basis of a machine using hot water temperature, which allows the outlet temperature of 160 deg or higher, due to the temperature higher than 90 deg, the water thermal conductivity with temperature than the oil much better, so this machine has a prominent high-temperature working ability. In addition to time, there is a forced flow of the mold temperature machine, for security reasons, the mold temperature design temperature above 150 deg, the use of thermal oil. To prevent mold temperature in the oil heater overheating, the aircraft uses a forced flow pumping system, and the heater tube by a number of stack components, the pipe has a heating element with fins for the diversion.

6, control the temperature inside the mold uneven points, and also injection cycle time related. After the injection mold cavity temperature rose to the highest, then hit the hot melt cold wall cavity, when the temperature after the removal of parts to a minimum. Mold temperature effect is to keep the temperature constant and deg2max in deg2min between, that is to prevent the temperature difference deg degw or gaps in the production process fluctuations. The following types of control methods for control of mold temperature: the temperature control fluid is the most commonly used method, and the control precision can meet most requirements. Using this control method, the temperature displayed on the controller and the mold temperature is not uniform; considerable fluctuations in temperature of the mold, the mold thermal factors which affect not directly measure and compensate for these factors include changes in the injection cycle, injection speed, melt temperature and room temperature. The second is the direct control of mold temperature. This method is internally mounted temperature sensor in the mold, which mold temperature control precision is relatively high in the case will be used. Mold temperature control of the main features include: the temperature controller set temperature with the same mold; factors affecting the thermal mold can be directly measured and compensated. Typically, the mold temperature stability better than that by controlling the fluid temperature. In addition, the mold temperature control in the production process control of reproducibility. The third is joint control. Joint control is the combination of methods, it can also control the flow and mold temperature. In the joint control of the temperature sensor position in the mold is extremely important, and temperature sensor, we must consider the shape, structure and location of the cooling channel. In addition, the temperature sensor should be placed on the quality of injection molded parts where played a decisive role. Connect one or more of the injection molding machine mold temperature controller, there are many ways. From operational, reliability and performance to consider the best use of digital interfaces such as RS 485. In the injection molding machine control unit and the transmission of information between the software can be. Mold temperature can be automatically controlled.

7, mold temperature machine configuration and use of mold temperature machine’s configuration should be based on processing of the material, the weight of the mold, requiring warm-up time and productivity kg / h to a comprehensive determination. When using heat-conducting oil, the operator must comply with safety requirements such as: Do not close the mold temperature on the stove where the heat source; joint use of taper of the leak-proof and has a temperature pressure hose or hard tube; regular inspection temperature control loop mold temperature, and mold without leaking joints, function properly; regular replacement of heat-conducting oil; should use artificial synthetic, thermal stability, coking propensity small. In the use of mold temperature machine, select the appropriate heat transfer fluid is critical. Water as heat transfer fluid economic, clean, easy to use, once the temperature control loop, such as hose couplings leak out of the water flow can be directly discharged into the sewer. However, water as heat transfer fluid water also has disadvantages: the low boiling point of water; according to the composition of the water may be corrosive and scaling, and increasing the pressure loss caused by mold and heat exchange efficiency between the fluids down, and so on. Using water as a heat transfer fluid should be considered when the following preventive measures: pre-treatment with anti-corrosive temperature control circuit; inlet filter before use; cleaning agents regularly with rust and mold temperature machine. No water with heat-conducting oil shortcomings. High boiling point oil, which can be used for temperatures higher than 300 deg or higher, but heat transfer oil heat transfer coefficient of water is only 1 / 3, so there was no oil in the injection molding machine with a wide range of temperature machine.

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