JPH04266461A - Method for conveying cast strip in twin roll type strip casting method - Google Patents

Abstract

PURPOSE:To convey a cast strip to a coiler without breakage by changing inclining angle of a sliding guide to support the cast strip fed out from a twin roll. CONSTITUTION:In a twin roll type continuous caster, the sliding guide 11 setting the upper end P approached to the twin rolls 1-1, 1-2 below the twin rolls and setting the lower end Q diagonally inclined downward. Then, the sliding guide 11 changes inclining angle as using the upper end P or the lower end Q as hinging center to support the cast strip 6 fed out from the twin rolls 1-1, 1-2. Further, following to change of the inclining angle of sliding guide 11, rotating speed of pinch rolls is adjusted. By this method, loading of excess tension stress and compressive stress to the cast strip just after feeding out from the twin rolls are eliminated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing thin plate slabs by twin-roll continuous thin plate casting.

0002

[Prior art] According to twin-roll type thin plate casting, the thickness is 1
A thin metal strip slab of ~3 mm is obtained. This results in a thin sheet of metal that is difficult to roll. Furthermore, when producing a thinner metal sheet by rolling, the rolling process can be greatly simplified because the reduction amount is small. However, in twin-roll thin sheet casting, especially in twin-roll thin sheet casting of brittle metals, there is a problem in that the slab tends to break immediately under the twin rolls.

FIG. 2 is an explanatory diagram of the formation of a slab in twin-roll thin plate casting. The molten metal 5 is injected into a sump 2 formed by twin rolls 1-1, 1-2 rotating in the direction of arrow 8 and a side weir 17. The molten metal is cooled by twin rolls to form solidified shells 3-1 and 3-2. The solidified shells 3-1 and 3-2 are integrated into a slab 6, which is taken out from the minimum gap 4 of the twin rolls. The solidified shells 3-1 and 3-2 are integrated at the minimum gap 4.

FIG. 3 is an explanatory diagram of a conventional example in which a manufactured slab 6 is conveyed to a winding machine 9. Figure 3(A) shows loop 10
This is an example in which the roll is formed directly under the twin rolls. In this case, loop 1
The dead weight of the slab 6 of 0 is equal to the slab immediately below the minimum gap portion 4. However, as already mentioned, in the case of brittle metal, the slab directly below the minimum gap 4 is fragile and cannot withstand the weight of the loop 10, and the slab is likely to break immediately below the minimum gap 4. . In FIG. 3(A), for example, 14-
It is also conceivable to provide pinch rolls at 1 and support the slab by sandwiching the slab between the pinch rolls. However, the slab is fragile, so if the clamping force is too strong, the slab will break.

FIG. 3(B) shows a slab conveying device described in Japanese Patent Application No. 2-101573. In FIG. 3(B), the strip-shaped slab 6 is sent out onto the sliding guide 11, slides from above to below on the sliding guide 11, and then moves to the pinch roll 1.
8 and the winding machine 9, and conveyed to the winding machine 9. According to this device, the weight of the strip 6 is the sliding guide 11.
I'm smiling. Therefore, the dead weight of the fragile slab immediately after exiting the twin rolls is significantly reduced, and breakage of the slab is prevented. However, as described below, this conveying device alone cannot completely prevent the slab from breaking.

FIG. 3(C) shows the conveying device of FIG. 3(B),
FIG. 3 is an explanatory diagram of an example in which the speed at which the strip-shaped slab is pulled out from the sliding guide 11 is slightly too fast. At this time, the support start position of the strip-shaped slab on the sliding guide 11 moves from 11-1 in FIG. 3(B) to 11-2 in FIG. 3(C). When the bearing start position moves to 11-2, the belt-shaped slab 6 from the minimum gap 4 to the bearing start position becomes too long, and the dead weight of the slab immediately after leaving the twin rolls becomes excessive. This may cause the slab to break. Although not shown, according to the findings of the present inventors, if the speed at which the strip-shaped slab 6 is taken out from the sliding guide 11 is slightly too slow, compressive stress acts on the strip-shaped slab 6, as shown in FIG.
A horizontal bend occurs in the slab between 4 and 11-1 in (B), and this horizontal bend also causes the strip-shaped slab 6 to break.

[0007] In twin roll type continuous thin plate casting, twin roll 1
-1 and 1-2 are rotated at a high circumferential speed of 30 m/min, for example, to produce the strip-shaped slab 6. Also, as mentioned in Figure 2,
The solidified shells 3-1, 3-2 are integrated at the minimum gap, and for this purpose, the rotational speed of the twin rolls 1-1, 1-2 is adjusted and changed frequently. In addition, the speed of the pinch roll is adjusted to be synchronized with the circumferential speed of the twin rolls. For this reason, the pinch rolls shown in FIG. 3(B) pull the strip strip 6 at high speed and frequently adjust the speed. If the rotational speed of the pinch roll is slightly too fast or slightly too slow, it may cause breakage as described above.

[0008]

[Problems to be Solved by the Invention] The present invention is an object of the present invention to provide a method for producing a cast slab in twin-roll type thin plate casting, in which a strip-shaped slab sent out from twin rolls can be stably conveyed to a winding machine without being broken. The challenge is to provide a transportation method.

[0009]

Means for Solving the Problems and Operations FIG. 1 is an explanatory diagram of a sliding guide according to the present invention. In FIG. 1(A), the upper end P of the sliding guide 11 is disposed below the twin rolls and close to the twin rolls. Further, the sliding guide 11 is inclined or curved, and the other end (lower end) Q is disposed downward. Incidentally, in this specification, an inclination or a curved inclination is collectively referred to as an inclination. The strip-shaped slab 6 is sent out onto the sliding guide 11 from the twin rolls 1-1, 1-2, and slides on the sliding guide 11 from above to below to reach the lower end Q. On the rear surface of the lower end Q of the sliding guide 11 (on the right side in FIG. 1), conventional conveying rollers 14, pinch rolls 18, and winding machine 9 (not shown) shown in FIG. Piece 6 (6-1) is conveyed to the winding machine. In the present invention, the inclination angle of the sliding guide can be changed and adjusted by moving the lower end Q of the sliding guide in the direction of arrow 12 with the upper end P of the sliding guide as an axis. This adjustment is accomplished by raising and lowering the lower end Q of the sliding guide using known mechanical, hydraulic or electrical means.

As already mentioned, if the rotational speed of the pinch rolls 18 in FIG. 3(B) is too high, the support starting point of the strip cast slab 6 moves to 11-2 in FIG. 3(C), and the strip cast slab 6 This may cause the piece 6 to break. In the present invention, in this case, FIG.
), move the sliding guide in the direction of the dotted arrow 12 and
' Set to position. By moving the sliding guide in this manner, it is possible to prevent the length of the strip-shaped slab from the minimum gap portion 4 to the support starting point from suddenly increasing, thereby preventing the slab from breaking.

A contact-type or non-contact-type detection end, for example, which can detect the presence or absence of contact between the strip-shaped slab 6 and the sliding guide 11, is arranged near the support starting point of the sliding guide 11, and from the detection end When the slide guide 11 is adjusted to move based on the information, the strip-shaped slab 6 (6-1, 6-2) always has its own weight sufficiently supported by the slide guide 11, and the strip-shaped slab 6 (6-1, 6-2) is always fully supported by the slide guide 11, and it is Excessive weight is not applied to the slab.

When compressive stress is generated in the strip, in the present invention, point Q in FIG. 1(A) is moved in the direction of the solid arrow (not shown) to extend the running path of the strip. The movement of the guide eliminates the compressive stress in the strip cast slab 6, thereby preventing the strip cast slab from horizontally bending as described in FIG.

FIG. 1(B) shows an example in which the inclination angle of the sliding guide is changed and adjusted by moving the upper end P of the sliding guide in the direction of arrow 12 with the lower end Q of the sliding guide as an axis. It is clear from the above description that in this case as well, the breakage of the strip slab can be prevented as in the case described with reference to FIG. 1(A).

In the second aspect of the present invention, the inclination angle of the sliding guide is changed and adjusted, and the pinch roll 18 shown in FIG.
Adjust the rotation speed. If the inclination of the sliding guide 11 is changed to an angle α in Fig. 1 (A) and adjusted to 11', and the strip is run as shown in 6-2, the breakage of the strip is prevented as described above. can. However, for example, due to a difference in height from the pass line of the conveyance roll group 14 shown in FIG. 3(B) provided on the rear surface of the sliding guide, the sliding guide is
It is preferable to return to position 11 from position ''. At this time, the rotational speed of the pinch rolls 18 is changed to become slower in accordance with the change amount α of the inclination angle, but by changing the rotational speed of the pinch rolls 18, the belt-shaped cast slab 6 is guided by the sliding guide. The running path until it leaves is gradually extended, and the inclination angle α also becomes smaller, so that the sliding guide returns from the position 11' to 11. Claim 2 of the present invention has been described with reference to an example in which the running track 6-2 of the strip cast slab in Fig. 1(A) is returned to the original running track 6-1. from the initial setting position 11 to 11', which is more preferable for operation.
Even when changing to the position shown in FIG.

For example, as shown in FIG. 3(B), it is possible to adjust the contact start position by adjusting only the rotating speed of the pinch roll 18 without changing the inclination of the sliding guide 11. However, according to the findings of the present inventors, this method does not have a quantitative scale that serves as a guideline for changing the rotational speed of the pinch roll 18, so the amount of change in the rotational speed may be too large or too small, resulting in a smooth process. It is difficult to make adjustments. In the method of the present invention, the inclination angle of the sliding guide is changed to quickly support the strip cast slab, and the rotating speed of the pinch roll 18 is adjusted using the amount of change in this inclination angle as a guideline. It is possible to smoothly control the traveling path of the strip, and therefore, it has an excellent effect in preventing breakage of the strip slab.

In this specification, the means for adjusting the conveyance speed of the strip-shaped slab 6 and sending it to the conveyor is collectively referred to as a pinch roll.
For example, conventional bridle rolls, take-up rolls, and the like can also provide the same effects as the pinch rolls. Therefore, the pinch roll of the present invention includes these various rolls.

[0017]

[Effects of the Invention] By using the method of the present invention, excessive tensile stress or compressive stress is not applied to the slab immediately after being delivered from the twin rolls, and therefore the high temperature immediately after being delivered from the twin rolls is avoided. It is possible to transport the fragile slab to the winding machine without breaking it.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the present invention, FIG. 2 is an explanatory diagram of the formation of a slab in twin-roll continuous thin plate casting, and FIG. 3 is an explanatory diagram of a conventional example of conveying a slab to a winding machine.

Claims (2)

[Claims] [Claim 1] A twin roll continuous casting machine having a sliding guide having an upper end disposed below the twin rolls close to the twin rolls and a lower end inclined diagonally downward, wherein the sliding guide is arranged around the upper end as an axis. Alternatively, a method for conveying slabs in a twin-roll thin plate casting method, which is characterized by supporting slabs sent out from twin rolls by changing the inclination angle around the lower end as an axis. 2. A twin roll continuous casting machine having a sliding guide having an upper end disposed below the twin rolls close to the twin rolls and a lower end inclined diagonally downward, wherein the sliding guide is arranged around the upper end as an axis. Alternatively, the twin rolls are characterized in that the slabs sent out from the twin rolls are supported by varying the angle of inclination about the lower end as an axis, and the rotational speed of the pinch rolls is adjusted in accordance with the change in the angle of inclination of the sliding guide. A method of conveying slabs in type thin plate casting.