JPH0790337B2 - Continuous casting equipment for metal ribbon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a metal thin film produced when a molten metal is supplied between the surfaces of a pair of rotating cooling drums to continuously produce a thin metal strip. The present invention relates to a continuous casting device capable of smoothly taking out a strip from a drum gap portion.

[Conventional technology]

Recently, attention has been focused on a method for directly producing a thin strip having a thickness of about several mm close to the final shape from a molten metal such as molten steel. With this continuous casting method, there is no need for a hot rolling step, and the rolling to the final shape may be mild, so the steps and equipment can be simplified.

As one of such continuous casting methods, there is a twin drum method (see Japanese Patent Laid-Open No. 60-137562). In this system, as shown in FIG. 3, a pair of cooling drums 1a and 1b that rotate in opposite directions are horizontally arranged and partitioned by the pair of cooling drums 1a and 1b and side dams 2a and 2b. The basin 3 is formed in the recess. The molten metal contained in the basin 3 is cooled and solidified at the portions in contact with the cooling drums 1a and 1b to become solidified shells.

The solidified shell moves to a so-called drum gap portion where the pair of cooling drums 1a and 1b face each other at a position closest to each other as the cooling drums 1a and 1b rotate. In the drum gap portion, the solidified shells formed on the surfaces of the respective cooling drums are pressed and integrated with each other to form the desired metal ribbon 4.

[Problems to be solved by the invention]

In this type of continuous casting apparatus, it is difficult to exactly match the growth conditions of the solidified shell on the peripheral surfaces of the cooling drums 1a and 1b. Therefore, the solidified shells grown on the peripheral surfaces of the respective cooling drums 1a and 1b differ from each other in the timing at which the solidified shells are separated from the peripheral surface. Further, it is difficult to accurately synchronize the rotation speeds of the cooling drums 1a and 1b, and the deviation of the rotation speeds also causes vibrations, shakes and the like. Also at high speed the cooling drum 1
Since the thin metal strips 4 are sent out from the drum gap portions a and 1b, the thin metal strips 4 to be carried out meander greatly due to vibration, shake, or the like in some cases. Therefore, in relation to the metal ribbon conveyor (not shown) arranged on the downstream side of the continuous casting machine, the cooling drums 1a, 1
It becomes difficult to adjust the speed between b and the transfer device.

Furthermore, when the solidified shell is difficult to separate from the cooling drum 1a or 1b, the metal ribbon 4 adheres to the cooling drum 1a or 1b and rotates. In this way, the metal ribbon 4 is the cooling drum 1a.
Alternatively, when it clings to the peripheral surface of 1b, the work becomes extremely unstable, and defects such as flaws and deformation occur in the obtained metal ribbon 4.

Such a drawback can be solved by making the conditions of the solidified shells separated from the respective cooling drums 1a and 1b the same. However, from a realistic perspective, the cooling drums 1a, 1b
It is extremely difficult to make the cooling conditions on the peripheral surface and the rotation speeds of the cooling drums 1a and 1b completely the same.

Therefore, the present invention prevents vibration and blurring of the metal ribbon fed from the drum gap portion, and stably peels the metal ribbon from the cooling drum at a fixed position on the peripheral surface of the cooling drum. With the goal.

[Means for solving problems]

The continuous casting apparatus of the present invention, in order to achieve the purpose,
In a metal strip continuous casting device for producing a metal strip by supplying molten metal between the surfaces of a pair of rotating cooling drums,
One of the cooling drums is positioned below the drum gap portion, and the pressing roll is arranged to face the one of the cooling drums independently driven by a driving source separate from the cooling drum.

〔Example〕

Hereinafter, the features of the present invention will be specifically described by way of examples with reference to the drawings.

FIG. 1 is a sectional view showing the outline of a continuous casting apparatus according to an embodiment of the present invention. In FIG. 1, components corresponding to those shown in FIG. 3 are designated by the same reference numerals, and the description thereof is omitted. Also, in FIG. 1, the side weir is not shown.

The continuous casting apparatus of this embodiment differs from the apparatus shown in FIG. 3 in that the pressing roll 6 is placed on the peripheral surface of one cooling drum 1b at a position below the drum gap portion 5 of the cooling drums 1a and 1b. It is the point facing each other. This pressing roll 6 is
It is rotationally driven independently by a drive source separate from the cooling drum. The rotation peripheral speed of the pressing roll 6 is set to the cooling drum.
It should be smaller than the peripheral speed of 1b.

FIG. 2 is a diagram for explaining the action of the pressing roll 6. Now, when the rotational peripheral speed of the cooling drum 1b is V ₁ , the surface of the metal ribbon 4 along the peripheral surface of the cooling drum 1b is
Conveying force F ₁ which is proportional to the peripheral speed V ₁ is working. On the other hand, the conveying force F ₂ proportional to the rotational peripheral velocity V ₂ of the pressing roll 6 also acts on the surface of the metal ribbon 4 on the pressing roll 6 side. At this time, since V ₁ > V ₂ , the conveying force on both surfaces of the metal ribbon 4 also becomes F ₁ > F ₂ .

Due to the difference ΔF (= F ₁ −F ₂ ) in the conveying force, a clockwise rotating force F ₃ in FIG. 2 acts on the metal ribbon 4 with the pressing roll 6 as a fulcrum. Due to this rotational force F ₃ , the metal ribbon 4 and the pressing roll 6 are separated from the peripheral surface of the cooling drum 1b. Further, in the range from the drum gap portion 5 to the pressing roll 6, the generated metal ribbon 4 is conveyed while being pressed against the peripheral surface of the cooling drum 1b by the pressing roll 6. Therefore, the left and right cooling drums 1a, 1
A slight deviation of the rotation speed of b and the cooling drum of each solidification shell 1
The metal ribbon 4 is stably sent out from the drum gap 5 regardless of the difference in ease of separation from the a and 1b.

Moreover, since the metal ribbon 4 is uniformly pressed in the width direction against the cooling drum 1b by the pressing roll 6,
The contact state and separation of the metal ribbon 4 with respect to the cooling drum 1b in the width direction become uniform, and the vibration and shake of the metal ribbon 4 are prevented.

The pressing roll 6 is provided at an angle θ along the circumferential surface of the cooling drum 1b from the horizontal plane connecting the centers of the cooling drums 1a and 1b.
Is preferably in the range of 20 to 60 degrees. That is,
The angle θ is 20 because the area near the drum gap 5 is narrow.
It is difficult to install the pressing roll 6 itself at a position smaller than the degree. On the other hand, at a position where the angle θ exceeds 60 degrees, it becomes difficult to connect to the subsequent transportation equipment, and the metal ribbon 4
May be overcooled by the cooling drum 1b.

In this way, the metal ribbon 4 separated from the cooling drum 1b
Is stably carried out of the casting apparatus without being affected by the difference in rotation speed of the cooling drums 1a and 1b and the difference in growth conditions of the solidified shell. Therefore, the obtained metal ribbon 4
In addition, defects such as flaws and deformation due to abnormal carry-out do not occur.

Further, the position where the metal ribbon 4 is separated from the cooling drum 1b is also fixed. Therefore, it becomes possible to control the rotation speed of the transport roll 7 of the metal ribbon transport device provided on the downstream side in the transport direction of the metal ribbon 4 in accordance with the rotation speed of the cooling drums 1a and 1b. For example, the thin metal strip 4 can be transported with a constant tension applied. As a result, the properties of the metal ribbon 4 are also stabilized.

In the above example, the case where the axial positions of the cooling drums 1a and 1b are unchanged and the metal ribbon 4 having a constant width is manufactured has been described. However, it goes without saying that the present invention can be applied to the case of manufacturing the metal thin strips 4 having different widths by changing the relative positions of the cooling drums 1a and 1b in the axial direction without being restricted by this.

〔The invention's effect〕

As described above, in the present invention, by adopting the pressing roll, the metal ribbon carried out from the drum gap portion is not vibrated or shaken, and the metal ribbon is surrounded by the cooling drum at a predetermined position. Can be pulled away from the surface.
As a result, the carrying out of the metal ribbon becomes stable, and a metal ribbon of excellent quality is manufactured.

[Brief description of drawings]

FIG. 1 shows the outline of a continuous casting apparatus according to an embodiment of the present invention, and FIG. 2 is a view for explaining the action of a pressing roll in the apparatus. Further, FIG. 3 shows a conventional continuous casting apparatus for metallic strips.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kunimasa Sasaki 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Katsumi Hirata 4-chome, Kannon Shinmachi, Nishi-ku, Hiroshima Prefecture 6-22 No. 22 Hiroshima Works, Mitsubishi Heavy Industries, Ltd. (56) Reference JP-A-61-229445 (JP, A)

Claims (1)

[Claims] 1. A continuous casting apparatus for a thin metal strip for supplying a molten metal between the surfaces of a pair of rotating cooling drums to produce a thin metal strip, wherein one of the cooling drums is positioned below a drum gap. A continuous casting apparatus for a thin metal strip, wherein the pressing rolls are arranged to face each other by being independently driven to rotate by a driving source separate from the cooling drum.