1.material

The choice of mold material has a great influence on the service life of the mold, according to the data research, improper material selection and heat treatment will lead to early failure of the mold, and aluminum die casting mold belongs to the hot work mold, its manufacturing conditions are relatively poor. Production personnel should control the temperature of aluminum liquid between 650-720 ℃, and preheating. If not preheated, the surface temperature of the mold cavity will rise from room temperature to liquid temperature, and the surface of the cavity will be subjected to large tensile stress. In the process of opening the top of the mold, the cavity surface will also be subjected to a large compressive stress, and after thousands of die casting, cracks and other defects will appear on the surface of the mold.

2. Structure design

Design of aluminum die casting mold, should avoid rounded corners too sharp, cross-section change is too large, because the sharp corners caused by the stress concentration is 10 times the average stress of the mold, may easily lead to early failure of the mold. In addition, the designer should also pay attention to the deformation and cracking of the mold in the subsequent heat treatment. In order to prevent the formation of the above defects, the mold cross-section size should be uniform and symmetrical, blind holes as far as possible to open for through-hole, if necessary, can open the process hole. In the mold structure design, should also avoid the appearance of geometric gaps, including knife marks, corners, translation slots, holes and section mutation.

3. Processing methods

Incorrect processing is likely to lead to stress concentration and lack of finish, which will lead to defects in the mold, affecting the service life. Therefore, in the process of mold processing, the surface of the cooling control system should be smooth without any processing marks.