Precision die casting die factory can tell you what causes die casting die failure
Commonly used die casting alloys are zinc, aluminum, magnesium and copper alloys, as well as pure aluminum die casting. Zn, Al and Mg are the more active metal elements, and they have a better affinity with the die material, especially Al is easy to bite the die. The higher the hardness of the mold, the better the corrosion resistance, if there are soft spots on the forming surface, it is harmful to the corrosion resistance.
1. Thermal fatigue cracking failure
In the process of die casting production, the die is repeatedly affected by cold shock heat, which makes the formed surface and its interior deform, thus causing mutual involvement and repeated thermal stress, leading to structural damage and toughness reduction, leading to microcracks and continued expansion. After crack propagation, molten metal will be squeezed into it, and repeated mechanical stress will be added to accelerate crack propagation. Therefore, on the one hand, the mold must be completely preheated at the beginning of die casting. In addition, the die must be kept within a certain working temperature range during die casting to avoid early cracking failure. At the same time, we must ensure that the internal factors before the mold is put into production and during the manufacturing process will not cause problems. In actual production, most die failures are thermal fatigue cracking failures< br> 2.Precision die-casting die factoryTell the reason for the fracture failure
Under the action of the pressure injection force, the mold will initiate cracks at the weak points, especially the scribing marks or electric machining marks on the molding surface of the mold are not polished, or fine cracks will appear at the corner clearing of the molding. When there are brittle phases or coarse grains at the grain boundary, it is easy to fracture. However, the crack propagates rapidly during brittle fracture, which is a very dangerous factor for the fracture failure of the die. For this reason, on the one hand, all scratches and electric machining marks on the mold surface must be polished, even if they are in the gating system, they must also be polished. In addition, the die materials used shall have high strength, good plasticity, good impact toughness and fracture toughness< br> 3.Precision die casting die factoryintroduces the causes of corrosion failure
The commonly used die-casting alloys are zinc alloy, aluminum alloy, magnesium alloy, copper alloy and pure aluminum die-casting. Zn, Al and Mg are more active metal elements, which have better affinity with mold materials, especially Al is easy to occlude the mold. The higher the hardness of the mold, the better the corrosion resistance. If there are soft spots on the molding surface, it is harmful to the corrosion resistance p>