Analysis of reasons for scrapping in die-casting mold manufacturing?

Die casting molds in die-casting factories have a corresponding lifespan, but this lifespan is related to many factors. So, what is the reason for this?

1. Mold design

In mold design, sharp corners should be avoided as much as possible, and the positions of holes and grooves should be arranged reasonably.

2. Selection of Mold Steel

The selection of mold steel must complete the use of heat treatment to eliminate carbide segregation, refine carbides, and achieve a uniform structure.

3. Cooling and lubrication

Cooling and lubrication of molds: In order to reduce the thermal load of the mold and avoid excessive mold temperature, mandatory cooling is usually carried out during the intermittent operation of the mold, which leads to periodic heating and cooling effects of the mold, resulting in thermal fatigue cracks. Therefore, the mold should be slowly cooled after use, otherwise thermal stress will occur, leading to mold cracking and failure.

4. Die casting and maintenance

The mold should be fully preheated before die-casting. If the preheating temperature is too high, the temperature of the mold will be too high during use, resulting in a decrease in strength and easy plastic deformation, causing the surface of the mold to collapse; The preheating temperature is too low, and when the mold starts to be used, the surface temperature changes rapidly, resulting in high thermal stress and easy cracking.