What are the factors that affect the service life of precision casting?

What are the factors that affect the service life of precision casting?

1. Corrosion failure. The hardness of the mold is high and the corrosion resistance is good. However, if the hardness of the mold is not good, the corrosion resistance is not good.

2. Thermal fatigue crack damage and failure. During the injection molding process, the mold is repeatedly molded under the action of heat and cold, and the molding surface and internal deformations involve repeated cycles of thermal stress, tissue damage and toughness loss, leading to the occurrence of microcracks and Continuous expansion. Once the crack expands and the metal melts, repeated mechanical stress accelerates the crack expansion. Therefore, on the one hand, the mold should be preheated. In addition, during the production process, the mold should be kept within the corresponding operating temperature range to avoid early cracking failure. At the same time, there is no problem with the internal reasons before precision mold processing and production. From the perspective of actual production, mold failure is mainly due to thermal fatigue cracking.

3. Fault structure failure. Under the action of pressure, the mold will crack at weakly developed parts. The surface marks or electrical machining marks of precision-machined molded parts are not polished, or some small cracks may appear in the corners of the molded parts. When the crystal boundary is brittle or the crystal is coarse, When molded, it is easy to break, therefore, all scratches, electrical machining marks, etc., even during the main part of the entire pouring operation, the mold working surface should be polished.