Verification result and analysis of chiller in die casting machine
One disadvantage of the die casting process is that the mold temperature is high, the casting solidification and cooling rate are slow, and the single-piece production cycle is long. By controlling the temperature, flow and other parameters of the chiller, the temperature of the mold is controlled, the cooling rate is increased, and the production efficiency is improved. The use of a low-temperature chiller can effectively shorten the crystallization and solidification time of the casting, improve the casting production efficiency, reduce the rejection rate and extend the life of the mold.
The system structure of the industrial chiller in the die-casting machine [air-cooled chiller]
In order to ensure the continuity and stability of production, the refrigerator system adopts internal and external circulation systems. The internal circulation cooling water adopts industrial pure water. The flow sequence is that the water pump draws from the circulating water irrigation and provides pressure, and flows through the filter → heat exchanger → Solenoid valve → Regulating valve → Flow meter → Mould. After the mould flows out, it returns to the circulating water tank. The circulating water tank is equipped with a pure water supply pipeline, and the opening and closing of the supply water pipeline is controlled by a float valve. Temperature sensors and flowmeters are installed in many places in the pipeline to adjust and control the water temperature and flow rate to ensure the stability of the process. Add a compressed air pipeline before the mold cooling pipeline, and use compressed air to cool the mold when the cooling water is turned off. The heat transfer between the internal and external circulation is realized by the heat exchanger. The external circulation takes away the heat from the internal circulation. The cooling water used in the external circulation is the soft water circulating in the workshop, with a large flow rate and a constant temperature.
The control system of the ice water machine in the die casting machine [chiller manufacturer]
When designing the industrial chiller scheme, according to different process requirements, two different control methods are considered in the control mode of the cooling water temperature and flow rate. One is through time control, that is, the solenoid valve is opened at a certain point in time and automatically closed at another point in time after a period of time. The other is through temperature control, that is, the casting machine control system is based on the temperature of the mold detected by the thermocouple installed on the mold. When the temperature exceeds a certain value, the solenoid valve is opened and the opening ratio is controlled to reduce the temperature to a certain value. When the solenoid valve is closed or reduce the opening ratio.
