What causes the service life of aluminum die casting mold?
Release time:2024-03-04
What causes the service life of casting-china.com' target='_blank'>aluminum die casting mold?
At present, aluminum die casting mold is a more widely used mold type, which has the characteristics of long production cycle, large investment and high precision, so the production cost of this mold is also relatively high. However, due to a series of internal and external factors such as materials and mechanical processing, the mold may be scrapped due to premature failure. The following Ustar is going to analyze to you, what is the reason that affects the service life of aluminum die casting mold?
First, materials
The choice of mold material has a great impact on the service life of the mold. According to the data research shows that improper material selection and heat treatment will cause early failure of the mold, and aluminum die casting mold is a hot work mold, its production and manufacturing conditions are relatively harsh, aluminum melting point between 580-740 ° C, so in the die casting, the production personnel should control the temperature of liquid aluminum between 650-720 ° C and preheat, if not preheat, then, The surface temperature of the mold cavity will increase from room temperature to liquid temperature, and the surface of the mold cavity will bear greater tensile stress. In the process of opening the top part of the mold, the surface of the cavity will also bear great compressive stress, and after thousands of die-casting, the mold surface will appear cracks and other defects.
In summary, the quality requirements of aluminum die casting molds are relatively high. At the current stage, the material of aluminum die casting mold is H13 steel, which is a more widely used hot work die steel, and this steel has good cold and thermal fatigue resistance, fracture toughness and thermal stability.
Before manufacturing aluminum die casting molds, manufacturers need to analyze and check the materials first to prevent early scrap of molds and waste of processing costs.
Second, structural design
When designing aluminum die casting molds, the rounded corners should be avoided as well as the cross section changes too sharply, because the stress concentration caused by sharp rounded corners is 10 times the average stress of the mold, which is easy to lead to early failure of the mold. In addition, the designer should also pay attention to the subsequent heat treatment deformation and cracking of the mold, in order to prevent the formation of the above defects, the mold section size should be uniform and symmetrical, the blind hole should be opened into a through hole as far as possible, and the process hole can be opened if necessary. The mold structure design should also avoid the appearance of geometric notches, including knife marks, Angle, scouring groove, hole and cross section mutation.
Incorrect machining is easy to cause stress concentration and insufficient finish, which may lead to mold defects and affect the service life. Therefore, in the mold processing process, the surface of the cooling control system should be smooth, without machining traces.
These are the three factors that affect the service life of aluminum die casting mold, with the progress of science and technology, manufacturers need to learn advanced machining technology, pay attention to production precautions, and try to improve the processing accuracy of aluminum die casting mold, so as to extend the service life of the mold.
