CN101658906A - Continuous casting method for producing alloy casting rolling plate on casting-rolling machine - Google Patents

Abstract

The invention relates to a continuous casting method for producing 6811 alloy casting rolling plate on a casting-rolling machine. The method is characterized in that: firstly alloy melt which accordswith 6811 alloy ingredients is smelted in a smelting furnace, the melt inflows into a front box capable of controlling liquid level height, and the liquid level height is maintained at 15-17mm; the melt is fed into a feeding mouth arranged between the two rotating casting rolling rolls of the casting rolling machine through a cross gate, and then casting rolling is carried out; casting rolling temperature is 693-673 DEG C; circulating cooling water is filled in the casting rolling roll, cooling water flow rate is 80-100t/h, pressure is 4-5kg/cm<2>, and water inlet temperature is not more than30 DEG C; the casting rolling machine is in Phi960x1600 type, and casting rolling area is 60-65mm; roll force is 800-1000KN; casting rolling speed is 0.78-0.85m/min; and after casting rolling, platesare fed into machine line by a pinch roll, the head part is cut off, and the plates are fed into a recoiling machine to be recoiled into big volume with the required diameter. The invention has high efficiency, high yield, low cost, good plate cut and stable quality.

Description

A kind of continuous cast method of on casting and rolling machine, producing alloy casting plate

(1) technical field

The present invention relates to a kind of continuous cast method of on casting and rolling machine, producing alloy casting plate.Belong to aluminium alloy deep process technology field.

(2) background technology

6811 alloys are mainly used in processing automobile radiator aluminium foil, and producer mainly produces by hot rolling blank both at home and abroad at present.Its traditional handicraft is: melting-semi-continuous casting-sawing ingot casting end to end-homogenizing annealing-mill face-heating-hot rolling-crop volume-hot rolled coil that truncates-go up.The shortcoming of this traditional handicraft: the energy consumption height, yield rate is low, cost is high, template is wayward.

Because contain higher manganese and zinc in 6811 alloys, roll casting sheet is in strip casting process, the two-phase section scope of being made up of solid phase and liquid phase strengthens, make that 6811 alloys will be in casting district, 5cm left and right sides scope, finish crystallization and rolling very difficulty within 2～3 seconds, do not see as yet inside and outside the native land that employing continuous casting on casting and rolling machine produces 6811 alloy casting plates.

(3) summary of the invention

The invention reside in and overcome above-mentioned deficiency, a kind of production efficiency height is provided, the yield rate height, cost is low, good plate cut, the stay-in-grade continuous cast method of producing alloy casting plate on casting and rolling machine.

The object of the present invention is achieved like this: a kind of continuous cast method of producing alloy casting plate on casting and rolling machine, it is characterized in that: at first be smelted into the alloy melt that meets 6811 alloying components at smelting furnace, its temperature is 730 ℃-760 ℃, import then and leave standstill stove, refining is skimmed, the control melt temperature is at 720-740 ℃, enter depassing unit through head piece and chute and remove hydrogen in the melt, impurity in bilayer filter elimination melt, add grain refiner, inflow can be controlled in the preceding case of liquid level, and the case liquid level is at 16 ± 1mm before keeping;

Before case bottom the connection cross gate is arranged, melt enters the feed mouth of the casting roll shop building of two rotations that are positioned at casting and rolling machine through cross gate, begins casting then; The casting temperature is decided to be: 698 ℃ ± 5 ℃;

Pass to recirculated cooling water in the casting roller, cooling water flow: 80-100t/h, pressure: 4-5kg/cm ², inflow temperature≤30 ℃;

Casting and rolling machine adopts ∮ 960 * 1600 to surpass the type casting and rolling machine, and the casting district is 60-65mm; Roll-force is 800-1000KN; Roll casting speed 0.78m/min-0.85m/min;

After the casting, send the machine row to, cut head, enter coiling machine, be rolled into the big volume of required diameter through pinch roll.

Characteristics of the present invention are:

6811 alloys are owing to contain higher manganese and zinc, and the two-phase section scope of being made up of solid phase and liquid phase is big, and it is long to solidify the required time fully.Therefore, must strengthen the length in casting district, adopt the standard type casting and rolling machine, the casting roller directly has only ∮ about 650, and casting district≤50mm can't satisfy 6811 freezing ranges.Therefore adopt ∮ 960 * 1600 to surpass the type casting and rolling machine and can create bigger casting district and condensing condition faster, the casting district is decided to be 60-65mm.

Because of 6811 alloys contain higher manganese and zinc, intensity is big, and resistance of deformation is big, and roll-force is big, and the setting roll-force is 800-1000KN.

6811 two-phase section scopes are big, and it is long to solidify required time fully, therefore get slow roll casting speed 0.78m/min-0.85m/min.

For increasing intensity of cooling, cooling water flow: 80-100t/h, pressure: 4-5kg/cm ², inflow temperature≤30 ℃.

Thickness of slab 7mm, mill roll-gap is decided to be 4.8-4.9mm.

Determining of preceding case liquid level: 16 ± 1mm.

6811 alloys contain higher manganese and zinc, and viscosity is big, and the casting temperature is decided to be: 698 ℃ ± 5 ℃.

The casting section length, casting temperature, roll casting speed, preceding case liquid level, intensity of cooling.Exist close inner link between them.Only coordinate the relation between these parameters, could guarantee the production of continous-stable.

Produce 6811 alloy sheets with the continuous casting and rolling method and on a casting and rolling machine, finish casting and rolling two procedures simultaneously, compare with the production of hot rolling method, saved the ingot casting sawing end to end, mill operations such as face, heating cogging and hot rolling, a large amount of energy have been saved, reduced the remelting of waste material, lumber recovery improves 15% than hot rolling.Processing charges per ton are lower 1000 yuan than hot rolling method, and good plate cut, and thickness is even, good processability.

In sum, the present invention surpasses the continuous casting process of producing 6811 alloy casting plates on the type casting and rolling machine at ∮ 960 * 1600, guaranteed the smooth production of 6811 alloy casting plates, replaced the production method of producing 6811 alloy slabs with the hot rolling method, have that yield rate height, cost are low, good plate cut, thickness evenly, the advantage of good processability.

(4) specific embodiment

A kind of continuous cast method of on casting and rolling machine, producing 6811 alloy casting plates:

At first be smelted into the alloy melt that meets 6811 alloying components at smelting furnace, its temperature is 730 ℃-760 ℃, import then and leave standstill stove, refining is skimmed, and the control melt temperature is at 720-740 ℃, enters depassing unit through head piece and chute and removes hydrogen in the melt, impurity in bilayer filter elimination melt, add grain refiner, inflow can be controlled in the preceding case of liquid level, and the case liquid level is at 16 ± 1mm before keeping;

Before case bottom the connection cross gate is arranged, melt enters the feed mouth of the casting roll shop building of two rotations that are positioned at casting and rolling machine through cross gate, begins casting then; The casting temperature is decided to be: 698 ℃ ± 5 ℃;

Pass to recirculated cooling water in the casting roller, cooling water flow: 80-100t/h, pressure: 4-5kg/cm ², inflow temperature≤30 ℃;

Casting and rolling machine adopts ∮ 960 * 1600 to surpass the type casting and rolling machine, and the casting district is 60-65mm; Roll-force is 800-1000KN; Roll casting speed 0.78m/min-0.85m/min; Mill roll-gap is decided to be 4.8-4.9mm;

After the casting, send the machine row to, cut head, enter coiling machine, be rolled into the big volume of required diameter through pinch roll.

6811 alloy compositions of the present invention see the following form:

Iron, copper, manganese element add with content 75% intermediate alloy during melting, and silicon reaches 90% instant silicon adding with content, and the zinc element adds when melt temperature reaches 720 ℃ with simple metal.

With electromagnetic agitation 20 minutes, make the alloying component homogenising.

Injection refining is 20 minutes behind the melt importing holding furnace.

Remove hydrogen in 6811 alloy solutions by Alpur type getter before the casting, make hydrogen content≤0.15ml/100gAl.

Remove impurity in 6811 alloy solutions with the double medium filtration case, ground floor 30ppi ceramic filter, second layer 60ppi filter.

The key technical indexes of the 6811 alloy casting plates that the present invention makes:

Thickness of slab: 7 ± 0.2mm

With plate poor≤0.035mm

Convexity 0.8-1.2%

Vertical one all plates are poor≤0.1mm

Hydrogen content≤0.15ml/100gAl

Grain size: 1 grade

Percentage elongation 0.8%

Tensile strength (Mpa) 187.21.

Claims (1)

1, a kind of continuous cast method of on casting and rolling machine, producing 6811 alloy casting plates, it is characterized in that: at first be smelted into the alloy melt that meets 6811 alloying components at smelting furnace, its temperature is 730 ℃-760 ℃, import then and leave standstill stove, refining is skimmed, the control melt temperature is at 720-740 ℃, enter depassing unit through head piece and chute and remove hydrogen in the melt, impurity in bilayer filter elimination melt, add grain refiner, inflow can be controlled in the preceding case of liquid level, and the case liquid level is at 16 ± 1mm before keeping;

Before case bottom the connection cross gate is arranged, melt enters the feed mouth of the casting roll shop building of two rotations that are positioned at casting and rolling machine through cross gate, begins casting then; The casting temperature is decided to be: 698 ℃ ± 5 ℃;

Pass to recirculated cooling water in the casting roller, cooling water flow: 80-100t/h, pressure: 4-5kg/cm2, inflow temperature≤30 ℃;

Casting and rolling machine adopts ∮ 960 * 1600 to surpass the type casting and rolling machine, and the casting district is 60-65mm; Roll-force is 800-1000KN; Roll casting speed 0.78m/min-0.85m/min;

After the casting, send the machine row to, cut head, enter coiling machine, be rolled into the big volume of required diameter through pinch roll.