Views: 0 Author: Site Editor Publish Time: 2025-02-12 Origin: Site
Hot rolling process
1. Raw material specifications
Flat ingot specifications: (420-460mm)×(1000-2000mm)×(3600-6800mm). Alloy grades for flat ingots: 1xxx, 3xxx, 5xxx, 8xxx, etc.
2. Equipment composition
1 flat spindle milling machine
2 sets of vertical push flat ingot heating furnaces
One 2400mm four roll reversible double coil hot rolling production line
3. Process flow and parameters
(1) Flat ingot milling is used to remove surface segregation nodules, slag inclusions, scars, and surface cracks, reduce metal and non-metal indentation defects on the plate, and improve surface quality. A flat ingot with a specification of 480 * 1500 * 6000 (weight 11.66T) is pushed into a milling machine to mill both sides of the flat ingot. The operating speed of the milling machine is 0.2m/s, and the maximum thickness of the flat ingot that needs to be milled off is 6mm. The weight of aluminum shavings milled off from one flat ingot is 383Kg, and 32.8kg of aluminum shavings are produced per ton of aluminum in the flat ingot.
(2) Flat ingot heating
The qualified flat ingots for milling are heated in a vertical push heating furnace at a temperature of 350 ℃ to 550 ℃ for 5-8 hours. The heating furnace has 5 zones, each zone is equipped with a large flow air circulation fan installed on the top of the furnace. The fan operates at a speed of 10-20m/s and consumes 20m3/min of compressed air; There are a total of 20 natural gas burners in 4 zones, installed on both sides of the upper half of the furnace body, with a natural gas consumption of approximately 1200Nm3/h.
(3) Hot rough rolling
Push the heated flat ingot with a specification of 480 * 1500 * 6000 into a four roll reversible hot rolling mill for hot roughing, with a maximum rolling speed of 230m/s. After 5-13 passes of rolling, the flat ingot is finally rolled into a 20-160mm slab.
(4) Hot precision rolling
The hot rough rolled slab is subjected to precision rolling operation in the hot finishing mill, with a maximum rolling speed of 480m/s. After 10-18 passes of rolling, coils with a thickness of 2.5-16mm are produced.
