Die-casting molds sometimes fail during the die-casting production process. The reasons for the failure are mainly caused by the following three aspects. The following Jiaxing Yunhe Trading Co., Ltd. briefly introduces to you:
1. Fragmentation failure
Under the effect of injection force, the die-casting mold will break at the weakest position, especially if the marks or electro-machined marks on the molding surface of the mold are not polished, or the shape of the transparent corner appears first. Looks good. When the grain boundary has a brittle phase or coarse grains, cracks are easy to break. Cracks quickly propagate during brittle fracture, which is a risk factor for mold failure. Therefore, on the one hand, it is necessary to polish scratches on the surface of the mold, electrical machining marks, etc., even in the pouring system. In addition, the required mold materials have high strength, good plasticity, impact toughness and fracture toughness.
2. Corrosion failure
Commonly used die-casting alloys are zinc alloys, aluminum alloys, magnesium alloys and copper alloys, as well as pure aluminum die-casting. Zn, Al and Mg are relatively active metal elements, and they have good affinity with mold materials, especially Al is easy to bite. mold. When the hardness of the mold is high, the corrosion resistance is good, and if the molded surface has soft spots, the corrosion resistance is disadvantageous.
3. Thermal fatigue crack failure
During the die-casting production process, the die-casting mold is repeatedly subjected to heat and heat, and the forming surface and its internal deformation cause repeated cyclic thermal stress, resulting in structural damage and reduced toughness, resulting in the occurrence of micro-cracks and continuous expansion. Once the crack expands, the molten metal is squeezed, and repeated mechanical stress causes the crack to accelerate and propagate. Therefore, on the one hand, the mold must be sufficiently preheated at the beginning of die casting. In addition, during the die-casting production process, the die-casting mold must be kept within a certain operating temperature range to avoid early crack failure. At the same time, it must be ensured that there are no internal factors before and during the production of the mold. Due to actual production, most mold failures are thermal fatigue crack failures.
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