Analysis of preheating requirements for die-cast aluminum parts

Die-cast aluminum parts need to be pre-heated before use. The pre-heated cast aluminum mold must be pre-heated to a certain temperature before use. Pre-heating can extend the service life of the mold. Pre-heating multi-purpose electrical appliances or induction heating. You can use the molten metal (aluminum water) directly for preheating the mold in about 0.5h. Because the cold mold is in direct contact with the hot liquid metal, it is bound to be affected by thermal shock, which will cause thermal erosion and accelerate cracks caused by thermal fatigue. And peeling.

In the process of making die-cast aluminum, it can effectively improve the processing quality of the surface of the mold cavity, and the surface of the mold cavity should not have significantly deeper machining tool marks to prevent the mold from being cracked due to stress concentration during the work of the mold. In this case, the surface of the cavity should be effectively polished and ground, so that the surface roughness value of the cavity should be controlled below 0.8 μm.

The cooling of die-casting aluminum parts in use. In continuous production, the temperature of its aluminum casting mold tends to increase. Excessively high temperatures not only cause the liquid metal to form a shape, but also slow the cooling of the casting, resulting in coarse grains and the quality of aluminum casting Therefore, when the temperature of the cast aluminum mold is too high, cooling and cooling measures should be taken. Generally, compressed air or water is used to cool the cast aluminum mold. A cooling system is designed to ensure the thermal balance of the mold. It is strictly prohibited to cool the mold with cold water to avoid rapid cooling of the mold. Shrinkage causes cracks, premature failure of the mold, and shortened life. Of course, proper spraying of paint during the use of the mold can not only prevent the mold from sticking but also provide a certain cooling effect, which is beneficial to improving the life of the mold.

After use, the die-casting aluminum parts are maintained and managed. After the die-casting aluminum mold is used, the mold cavity should be cleaned to a certain extent in time to effectively remove the residual aluminum. After cooling, it should be rust-proofed and stored in the warehouse. Release and centralized management for reuse. Cast aluminum mold is an important tool in the manufacture of motors, and it occupies a large proportion in the manufacturing cost of motors. Practice has proved that the use of new mold materials, reasonable forging, and proper heat treatment are the key links to improve the service life of cast aluminum molds. At the same time, the mold design, manufacturing, use, maintenance management and other related links are well grasped, and the service life of cast aluminum molds can be effective With the extension, the manufacturing cost of the motor is correspondingly reduced.