The mold surface temperature is a dynamic process parameter and must be maintained within the optimal and uniform range in each die casting cycle, which will affect the quality of the die castings and the life of the mold. The temperature difference between the front cabin, the rear floor, and the battery tray during the production process is large. The mold temperature during the production process must be monitored and recorded, and abnormalities must be fed back in real time to ensure the quality of the product.
The arrangement of mold temperature equipment in the die-casting system mainly includes the following aspects:
Design of cooling and heating system: Usually, a pipe with a diameter of (6-12) mm is opened inside the mold module, and a cooling hole of (3-12) mm is opened in the core and the module, and water is passed for cooling and hot oil is passed for heating. In a die-casting plant without a mold temperature machine, an electric heating tube (control the heating temperature ≤400℃) and a thermometer can also be placed in the mold for automatic heating to preheat the mold.
Pipeline design: The cooling water channel of the mold should be far enough away from the mold surface or the mold corner to avoid early cracking or cracking of the mold surface in these parts. Rust and scale accumulation in the cooling water pipeline will affect the cooling effect of the mold and need to be removed in time. It is recommended to use copper and stainless steel materials for the pipes and joints connected to the mold to prevent rust from clogging the pipe.
Intelligent mold temperature system: In order to solve the problem that traditional mold temperature debugging relies on manual experience or CAE simulation software calculation, Longhua has proposed an intelligent mold temperature system. The system builds a predictable three-dimensional temperature field proxy model of the mold surface through deep learning neural network training, and realizes fully automated feedback control of the mold temperature. The system can automatically evaluate the rationality of the temperature control system design, confirm the number and properties of pipelines, match the number of oil temperature machines, water temperature machines and cooling unit circuits, and evaluate the rationality of group connections.
Safety protection system: The safety protection system of the mold temperature equipment includes a total power supply overcurrent fuseless switch, a motor reversal protection indicator, a water shortage protection and indicator, a pump overload and indicator, a BY-PASS pool pressure circuit, an abnormal alarm and a peak sounder, a water outlet pressure indicator, a return water temperature display, a three-phase input power supply under-reverse phase protection function, a water outlet pressure insufficient protection function, an overheating temperature protection switch, etc.
The working principle of the mold temperature controller is to circulate the organic heat carrier (thermal oil) through the hot oil circulation pump in the liquid phase, and then heat it to the target temperature through electric heating and then transport it to the mold. The mold oil outlet returns to the oil temperature machine to form a complete circulation heating system. The oil temperature machine uses a heat-conducting medium with high thermal conductivity and a higher temperature difference to increase the temperature in the mold or send away excess heat in a very short time. After setting the thermal balance temperature, it can automatically control its temperature within a very small error and maintain a fixed value. The mold temperature controller is used to adjust the equilibrium temperature of the mold, thereby optimizing the cycle time and better promoting product finalization.
