The preheating requirements and continuous production of aluminum alloy castings are briefly analyzed

Preheating requirements and continuous production of aluminum die castings are briefly analyzed

Aluminum alloy castings need to preheat before use casting aluminum mold before use to preheat to a fixed temperature, preheating can extend the service life of the mold preheating multi-purpose appliances or induction heating, preheating temperature control at 250 ° C ~ 300 ° C, heat preservation about 0.5h can be used to prohibit the use of molten metal (aluminum water) directly preheat the mold, Because the cold mold is directly in contact with the hot liquid metal, it is bound to be subjected to thermal shock, resulting in thermal erosion, accelerating the cracking and spalling caused by thermal fatigue.

In the process of production, aluminum die casting can effectively improve the surface processing quality of the mold cavity, the surface of the mold cavity should not appear significantly deeper processing tool marks, to prevent the mold work due to stress concentration caused by cracking mold finishing, should be effective polishing and grinding of the surface of the cavity, so that the surface roughness of the cavity is controlled below 0.8μm.

Aluminium alloy casting

Aluminum die casting in the use of cooling, in continuous production, the temperature of the cast aluminum mold often rise, the temperature is too high in addition to the liquid metal, but also make the casting cooling slow, resulting in coarse grains, cast aluminum quality decline, therefore, in the cast aluminum mold temperature is too high, should take cooling measures usually compressed air or water to cool the cast aluminum mold design cooling system, In order to ensure the heat balance of the mold, it is strictly prohibited to chill the mold with cold water, avoid the mold rapid cooling contraction to produce cracks, make the mold premature failure, and shorten the life of the mold. Of course, the appropriate spray paint in the use of the mold can prevent the sticking mold and play a certain cooling role, which is beneficial to improve the life of the mold.

Aluminum die casting after the use of its maintenance management, the use of the cast aluminum mold, to a certain extent, should be timely cleaning of the mold cavity, effective removal of residual aluminum, after cooling should be rust prevention treatment, and storage flat, centralized management, ready for reuse. The cast aluminum mold is an important tool in the motor manufacturing, which occupies a large proportion in the motor manufacturing cost. The practice has proved that the use of new die materials, reasonable forging and correct heat treatment are the key links to improve the service life of cast aluminum die; At the same time, grasp the mold design, manufacturing, use and maintenance management and other related links, the service life of the cast aluminum mold can be effectively extended, and the motor manufacturing cost is reduced accordingly.

When the EDM perforated electrode in the blade groove is manufactured, the edge around the electrode will be rounded to d1.5mm ~ 2mm to ensure that there is no sharp corner transition in the mold cavity after electric machining, and to avoid cracking and failure at the sharp corner of the mold. The correct and standardized use of cast aluminum mold, supplemented by careful maintenance and management, will extend its service life.