Die casting molds sometimes fail during the die casting production process. The causes of failure are mainly caused by the following three aspects. The following Yuxin Die Casting Factory introduces you briefly:
Under the action of the injection force, the die-casting mold will crack at the weakest point, especially the marking marks or electromachining marks on the molding surface of the mold are not polished, or the shape of the clear corner will be the first to appear fine. Cracks, when the grain boundary has a brittle phase or coarse grains, are easily broken. The crack propagates rapidly during brittle fracture, which is a dangerous factor for the failure of the mold. For this reason, on the one hand, scratches, electric machining marks, etc. on the mold surface must be polished, even if it is in the pouring system, it must be polished. In addition, the mold material used is required to 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 molding surface has a soft point, the corrosion resistance is disadvantageous.
3. Thermal fatigue crack damage failure
During die-casting production, the die-casting mold is repeatedly subjected to the action of stimulating heat and heat, and the forming surface and its interior are deformed, causing repeated cyclic thermal stresses, resulting in damage to the structure and loss of toughness, causing the occurrence of microcracks and continuing to expand. Once the crack is enlarged, the molten metal is squeezed in, and repeated mechanical stress causes the crack to accelerate and expand. For this reason, on the one hand, the mold must be sufficiently preheated at the start 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 crack failure. At the same time, it is necessary to ensure that the internal factors before and during the production of the mold are not problematic. Due to actual production, most mold failures are thermal fatigue crack failure.
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