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What factors can cause die casting failure?
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Many failures are beyond our expectation, because there are many times when we can't take into account all the problems, it will cause problems in the product. The die casting is the same, not only during production, but also during When using, there will be problems that will definitely affect the use. Then let's understand what factors will cause the failure of die casting?Fragmentation failure
Under the action of injection force, cracks will occur in the weakest part of the die-casting mold, especially the scribe marks or electro-processing marks on the molding surface of the mold are not polished, or the fine corners of the molding will appear first Cracks are easily broken when there are brittle phases or coarse grains at the grain boundaries. However, cracks propagate quickly during brittle fracture, which is a dangerous factor for the chipping failure of the mold. For this reason, on the one hand, any scratches on the mold surface, electrical processing marks, etc. must be polished, even if it is in the pouring system. In addition, the used mold material is required to have high strength, good plasticity, good impact toughness and fracture toughness.
Dissolution failure
Commonly used die-casting alloys are zinc alloys, aluminum alloys, magnesium alloys, and copper alloys. There are also pure aluminum die-casting. Zn, Al, and Mg are relatively active metal elements. They have a good affinity with mold materials, especially Al is easy to bite. mold. When the mold hardness is high, the corrosion resistance is good, and if there are soft spots on the molding surface, the corrosion resistance is not good.
Thermal fatigue crack damage failure
During die-casting production, the die-casting mold is repeatedly subjected to the effects of chilling and heat, and the forming surface and its interior are deformed, and the repeated thermal stress occurs, which leads to the damage and loss of toughness of the microstructure and the occurrence of microcracks, and continues to expand. Once the cracks have expanded, molten metal has been squeezed in, and repeated mechanical stress has accelerated the cracks. For this reason, on the one hand, the mold must be fully preheated at the beginning of die casting.
In addition, the die-casting mold must be kept in a certain operating temperature range during the die-casting production process to avoid early cracking failure. At the same time, make sure that internal problems do not occur before the mold is put into production and during manufacturing. Because in actual production, most mold failures are thermal fatigue cracking failures.
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