hot ingot rolling
First, the aluminum melt is cast into a slab, and after homogenization, hot rolling, cold rolling, intermediate annealing and other processes, it is continued to be cold rolled into a sheet with a thickness of about 0.4~1.0 mm as a foil blank (casting → hot rolling billet → cold rolling → foil rolling).
In the ingot hot rolling method, the hot rolled billet is first milled to remove defects such as oxide layer and impurities on the surface of the ingot, and then homogenized to make the microstructure of the ingot more uniform, followed by hot rolling, cold rolling and intermediate After multiple processes such as annealing, the internal structure uniformity and grain size of the billet have been significantly improved after multiple recovery and recrystallization. Therefore, the hot-rolled billet is usually of good quality and suitable for high-quality double zero aluminum foil and deep processing. Aluminum foil products. However, in the deep drawing process of hot-rolled billets, there are problems such as high ear rate, easy cracking, and uneven deformation area, which restricts the improvement of the yield of high-quality aluminum foil.
twin roll casting method
Compared with the ingot hot rolling method, the process flow of the aluminum foil blank production by the casting and rolling method is relatively simple; it does not need to go through complicated process steps such as smelting ingot, milling, homogenization and hot rolling, but pours the aluminum melt directly. The two rotating casting rolls (molds) are inserted into the casting and rolling area, and the two processes of solidification and hot rolling are simultaneously completed within 2~3s in the casting and rolling area to obtain a plate with a thickness of 4~7mm. Similar to the hot-rolled aluminum foil billet, the cast-rolled sheet also needs to undergo a series of cold rolling and intermediate annealing processes, and finally rolled into a 0.3~0.7mm thick sheet as an aluminum foil billet.