mold life what is factor affect

 mold life what is factor affect

No matter what kind of object has a certain service life, the injection mold is no exception. When the mold is used to a certain extent, the injection mold will be invalid. It is necessary to open the mold to produce a new mold. The service life of the injection mold is affected by many factors, only An injection mold factory that fully understands these factors can produce molds with longer life.
The first factor affecting the life of an injection mold is dissolution failure. The injection molding alloys commonly used in injection mold factories are zinc alloys, aluminum alloys, magnesium alloys, and copper alloys, as well as pure aluminum injection molding. Zn, Al, and Mg are more active metal elements, and they have a better affinity with mold materials, especially Al is easy to bite. 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.

The second reason that affects the life of injection molds is thermal fatigue, which leads to failure of crack damage. During injection molding, the mold is repeatedly subjected to the action of stimulating heat, and the forming surface and its interior are deformed, causing repeated cyclic thermal stresses. The damage of the structure and the loss of toughness lead to the appearance of microcracks and continue to expand. Once the cracks are enlarged, the molten metal liquid is squeezed in, and the repeated mechanical stress causes the cracks to accelerate and expand. For this purpose, on the one hand, the mould must be sufficiently preheated at the beginning of the injection. In addition, the mold must be kept in a certain operating temperature range during the injection molding 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 a crack failure.

The third reason that affects the life of the injection mold is the failure of the fracture. Under the action of the injection force, the mold will crack at the weakest point, especially the trace marks or electro machining marks on the molding surface are not polished, or Fine cracks appear first at the clear corners of the molding. When there is a brittle phase or coarse grain in the grain boundary, it is easy to break. 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 casting system, it must be polished. In addition, the mold material used is required to have high strength, good plasticity, impact toughness, and fracture toughness.
 
      After understanding the three factors that affect the service life of injection molds, CNMOULDING injection mold factory can adjust these problems in the process of manufacturing, avoiding the influence of these factors in advance, and making better quality molds. It not only greatly improves the efficiency of production, but also saves the production cost of the enterprise.

There are also some reasons that affect the precision of the mold.