Aluminum alloy hot rolled strip production process
Production process of aluminum plate and strip: flat ingot milling surface of flat ingot —— flat ingot heating —— hot rough rolling (reversible) —— hot fine rolling (irreversible) —— cold rolling (cutting, intermediate annealing, etc.) —— finishing (cleaning, transverse cutting, bending straightening, etc.) —— heat treatment production process; thick plate production process: flat ingot heating-hot rough rolling (reversible) —— hot fine rolling (irreversible) —— finishing (saw, etc.) production process.
Hot rolling process
1. Raw material specifications
Specification of flat ingot: (420~460mm) (1000~2000mm) (3600~6800mm).
The alloy brand number of the flat ingot: 1 xxx, 3 xxx, 5 xxx, 8 xxx, etc.
2. Equipment composition
1 flat ingot milling machine
2 sets of vertical and push type flat ingot heating furnace
2400mm four-roll reversible double roll hot rolling production line
3. Process flow and parameters
⑴ flat ingot milling surface
Flat ingot milling surface is to remove the surface of tumor, slag, scar and surface cracks, reduce the metal and non-metal pressing defects, improve the surface quality of the specification of 480 * 1500 * 6000 ingot (weight 11.66T), pushed into the milling machine on the two sides and both sides of the running speed of the milling machine is 0.2 m/s, the maximum thickness of the flat ingot is 6mm, the weight of 383 Kg, the aluminum ingot 32.8kg produced by tons of aluminum ingot.
⑵ flat ingot heated
The flat ingot with qualified milling surface is heated in the vertical push heating furnace, and the heating temperature is 350℃ ~550℃, and the heating time is 5-8 hours. The heating furnace is equipped with 5 zones, each with a large flow air circulation fan installed on the top of the furnace. The operating wind speed of the fan is 10-20 m/s and the compressed air consumption is 20 m3/min; 4 zones with 20 natural gas burner installed on both sides of the upper half of the furnace body, and the natural gas consumption is about 1200 N m3/h.
⑶ hot coarse rolled
After heating, the flat ingot of 480 * 1500 * 6000 is pushed into a four-roll reversible hot rolling mill, and the maximum rolling speed can reach 230 m/s. After 5~13 times of rolling, the flat ingot is finally rolled to 20~160mm slab.
⑷ hot finishing
After the hot finishing rolling unit, the maximum rolling speed can reach 480 m/s. After 10-18 rolling, a coil of 2.5~16mm is produced.
Cold rolling process
1. Entrance raw material specification
Thickness of coil material: 2.5~15mm
Wth of the rolling material: 880~2000 mm
Diameter of coil material: φ 610~ φ2000 mm
Coel weight: 12.5t
2. Equipment composition
2 sets of 2000mm non-four-roll reversible cold rolling mill set
40t intermediate, finished annealing furnace 6 sets
2 sets of 20m medium plate precision cutting machine
MK841808000 CNC roller grinder 2 sets
3. Process flow and parameters
⑴ cold rolling
2-15mm aluminum hot rolled roll through 3-6 four-roll irreversible cold rolling unit rolls to a finished thickness of 0.25~0.7mm. The computer implements flatness (AFC), thickness (AGC), tension (ATC) and other comprehensive automatic control for rolling, the rolling speed is 5 ~ 20 m/s, continuous rolling can reach 25 ~ 40 m/s, the pressure rate is generally 90%~95%.
⑵ annealing-in-process
In order to eliminate the hardening phenomenon of processing after cold rolling, some intermediate products need to conduct intermediate annealing operation. The annealing temperature is 315~500℃, and the insulation time is 1~3h. The intermediate annealing furnace is electric heated by. The top of the furnace is equipped with three high air volume fans, the wind speed is 10 ~ 20 m/s, the total power of the heater is 1080 Kw, and the consumption of compressed air is 20 N m3/h.
⑶ finished product annealed
After cold rolling, the products should be annealed, the annealing temperature is 260~490℃, the insulation time is 1~5h, the cooling speed of aluminum foil should be less than 15℃ / h, the discharging temperature should not be higher than 60℃, and the discharging temperature of other thicknesses should not be higher than 100℃.
The finishing process
1. Finished product specifications
Coel material thickness: 0.27~0.7mm
Wth of the rolling material: 880~1900 mm
Diameter of coil material: φ 610~ φ1800 mm
Coel weight: 12.5t
2. Equipment composition
2000mm cross cutting unit (2~12mm) 2 sets
2000mm pull unit (0.1~2.5mm)
2 sets of 2000mm cross-cutting unit (0.1~2.5mm)
2 sets of 2000cm plate straightening unit
2 sets of 2000mm coil automatic packaging units
MK84636000 CNC roller grinder 2 sets
3. Process flow and parameters
Horizontal cutting production line
The aluminum strip transverse shear unit is used for accurate transverse cutting of aluminum and aluminum alloy coil, and neat stacking plate according to the product requirements. The maximum shear length can reach 11m.
Pulling production line
Under the tension of 2.0 ~ 20 kN applied by the tension roller group, the aluminum roll continuously passes through several groups of small diameter bending rollers arranged alternately up and down, under the combined action of stretching and bending, the plastic extension along the length direction, so that the length of each longitudinal fiber of the strip tends to be consistent and improve the flatness of the strip. The running speed of the unit can reach 200m / min.
Thick plate straightening production line
The position of the roller is at some Angle with the movement direction of the straightened products, two or three large ones are the active pressure rollers, which are rotated in the same direction by the motor belt action, and several small rollers on the other side are driven pressure rollers, which are rotated by the rotating round rod or the pipe friction. In order to achieve the compression required by the rollers, these small rollers can be adjusted either forward or backward, respectively. After the product is bitten into the roller, it constantly moves straight or rotating, so that the product bears the compression, bending, flattening and other deformation, and finally achieve the purpose of straightening. The production line is 30 MN.
Deep-processing process
1. Wire-drawing and processing process
The main process is divided into three parts: ester, sand mill and washing. In aluminum plate drawing process, anode processing after special skin film technology, generally with 0.1 mm in diameter of stainless steel brush or best clean cloth belt brush, also can use nylon sand belt processing, can make the aluminum plate surface form a metal film layer, clear show each tiny silk trace, so that the metal matte in fine hair luster. In recent years, more and more aluminum plate products of the metal shell are used in the metal drawing process, in order to play the role of beautiful, anti-erosion.
2. Etching and treatment process
First with jujube carbon grinding, remove greasy, scratches, grinding out the matte surface. Then print the pattern with the screen plate, the ink model is 80-39,80-59,80-49, etc. After printing the pattern, put it into the electric oven for drying, and then seal the back with instant paste, seal the edge with adhesive tape, and enter the corrosion process. The formula of corrosion solution of aluminum plate is as follows: ferric chloride 50%: 50% copper sulfate 50%, appropriate amount of water, temperature between 15~20°. The aluminum plate should be placed flat. In the process of corrosion, the grain should be removed with a brush at any time. A large number of bubbles appear on the aluminum surface, and the dregs float with the bubbles. The corrosion time of aluminum plate can be completed about 15~20min.
3. Electrophoretic coating process
Process: defatasing hot water washing and washing anodic oxide water electrolysis coloring hot water washing electrophoresis water drying.
On the basis of anodic oxidation, through the action of electrophoresis, the oxide film is evenly covered with a layer of water-soluble acrylic paint film, forming the anodic oxide film and acrylic paint film composite film on the surface of the profile.
Aluminum strip into the solid part 7%~9%, temperature 20~25℃, pH8.0~8.8, resistivity (20℃) 1,500 ~ 2500 Ω cm, voltage (DC) 80 ~ 25 OV, current density 15 ~ 50 A/m2 after 1~3 min time coated film 7~12 μ m thickness.
2024/06/14 10:15:40
72 Number
15358968703