To protect molds and enhance their efficiency, it is crucial to maintain the mold's working state within a certain temperature range as much as possible. If the mold is not preheated, on one hand, due to the low mold temperature, it is prone to difficulties in forming, adhesion, and casting cracks. On the other hand, because of the significant temperature changes, there is a large amount of thermal stress, which can easily lead to mold damage, and in severe cases, the mold may even burst. Therefore, preheating the mold before use is of great importance.