1. Casting and rolling process:
1. Melting and casting 2. Crystal cooling forming 3 cold rolling 4. Finish rolling
First, the aluminum ingot and the required alloy are directly cast to form an aluminum alloy liquid. It is then cooled by a crystallizer to form a cast-rolled billet of the desired width. Cold rolling and finishing rolling are actually completed in one process. The casting and rolling billet is cooled to below a certain temperature with lubricant for rolling, and finally the aluminum material is formed.
2. Hot rolling process:
1. Melting and casting 2. Deslagging 3. Milling surface 4. Heating 5. Hot rolling 6 Cold rolling 7 Finish rolling
In this process, after smelting into alloy liquid, the slag is removed, about 1% -5% of the total amount, and then an ingot is formed. Due to the high temperature during the melting and casting process, impurities are attached to the surface of the alloy. The slag process cannot completely remove impurities, so after forming the ingot, the face must be milled, and the thickness of the ingot surface is milled to about 20mm to reduce impurities in the alloy. The ingot is heated at a high temperature to maintain a certain temperature to recrystallize its internal structure. After a long period of high constant temperature, the crystallization will be more uniform and the grains will be more delicate, and then rolled under high temperature to form a hot rolled billet , Finally cold-rolled and finished by rolling.
Compared with the cast and rolled billet, the hot rolled material has less impurities, so the corrosion resistance is much stronger, especially against seawater. At the same time, due to the recrystallization process, its internal structure is more stable and uniform, the performance of the formed aluminum material is better, and the ductility is better than that of the cast and rolled material.
Compared with the hot rolling process, cast rolling does not need to go through the slag removal, milling, heating, hot rolling and other processing processes, so cast rolling is also commonly known as cold rolling.