Die-casting molds are the core of die-casting manufacturers and the key to enterprise cost control. A good and durable die-casting mold can help companies save costs. However, even the best mold will fail. But why does the mold fail? Explanation of Jiaxing Yunhe Trading Co., Ltd.
1. Thermal fatigue crack damage failure
During die-casting production, the mold is repeatedly stimulated by cold and heat, and the molding surface and its interior are deformed, and they are mutually involved, resulting in repeated cycles of thermal stress, resulting in damage to the structure and loss of toughness, causing the appearance of micro-cracks and continuing to grow. Once the crack expands, molten metal squeezes in, and repeated mechanical stresses accelerate the crack propagation. For this reason, on the one hand, the mold must be fully preheated at the beginning of die casting. In addition, the mold must be kept in a certain working temperature range during the die-casting production process to avoid early cracking failure. At the same time, it is necessary to ensure that the internal factors before and during the production of the mold do not cause problems. In actual production, most mold failures are thermal fatigue crack failures.
2. Fragmentation failure
Under the action of the injection force, the mold will initiate cracks at the weakest part, especially if the scribe marks or electrical machining marks on the molding surface of the mold are not polished, or the clear corners of the molding will first appear micro cracks , When there are brittle phases or coarse grain boundaries, it is easy to break. However, the crack propagation is very fast during brittle fracture, which is a very dangerous factor for the fracture and failure of the mold. For this reason, on the one hand, all scratches and electrical machining marks on the mold surface must be polished, even if it is in the pouring system, it must be polished. In addition, the mold materials used are required to have high strength,
Good plasticity, good impact toughness and fracture toughness.
3. Dissolution failure
Commonly used die-casting alloys include zinc alloy, aluminum alloy, magnesium alloy and copper alloy, as well as pure aluminum die-casting. Zn, Al, and Mg are more active metal elements, and they have good affinity with mold materials, especially Al which is easy to bite. mold. When the mold hardness is higher, the corrosion resistance is better, and if there are soft spots on the molding surface, the corrosion resistance is unfavorable.
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