Causes of cracks in die casting molds

During the operation of the die-casting mold, it may crack, so how to avoid this situation? Let’s take a look at the causes of cracks in the die-casting mold.

The early cracking of die casting mold is usually caused by high forging temperature (commonly known as overburning). Overburning is an irreparable defect. During the manufacturing process of the blank, the forging temperature must be strictly controlled. The same is true for the quenching process. The heating time is strictly controlled to prevent decarburization. Heat treatment after material selection. After a certain amount of production, attention should be paid to the elimination of stress, as well as reasonable design, try to avoid stress concentration, and pay attention to the size control of the R angle.

When the mold is about 10,000 times, the mold should be tempered to eliminate stress. In the die-casting process, the residual stress caused by the concentrated treatment of internal forces has not been eliminated, and the thermal stress has not been eliminated well. All in all, the silver streak is a manifestation of stress concentration. Multiple tempering can be used to eliminate stress and increase the life of the mold.

1. The mold release agent is sprayed unreasonably during the die-casting production process.

2. The temperature of the mold is too high during the die-casting production process.

3. The die steel material is not good.

4. The mold heat treatment is not ideal, mainly due to the hardness.