JPH042341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a twin-belt continuous casting machine that can freely change the width of the metal ribbon produced.

(Conventional technology) Recently, it has become possible to obtain numbers close to the final shape from molten metal such as molten steel.
Continuous casting methods that directly produce metal ribbons with a thickness of approximately 10 mm to several tens of mm have been attracting attention. When this method is used, the conventional multi-step rolling process can be omitted, thereby simplifying the process and equipment.

Furthermore, since the process of heating the material to the processing temperature between each process is essentially unnecessary, an energy saving effect can also be expected. One such continuous casting method is the twin belt method.

FIG. 5 is a diagram schematically showing a twin belt type continuous casting machine developed by the present inventors for the above purpose (Japanese Patent Application No. 119716/1982). In this continuous casting machine, molten metal in a tundish 1 is supplied from a nozzle 2 to a casting space. This casting space is created by partitioning the opposite sides of the gap between a pair of belts 4 made of heat-resistant material such as steel that run across a pulley 3 with a short side mold 5 (see Fig. 6). It is formed. The molten metal poured into the casting space is cooled by the jet section 6a and the pad cooling section 6b, and is carried out as a metal ribbon 7.

In the cooling section of this device, since the static pressure of the molten metal is low in the jet section 6a at a certain depth from the molten metal surface 8, the cooling water is guided from the header 10 to the nozzle 11 as a jet jet at high pressure. The back side of the belt 4 is cooled. Further, the belt 4 is supported by a group of disc rolls 12 to maintain flatness.

Since the static pressure of the molten metal becomes high below the jet section 6a, a pad cooling section 6b is provided, and inside this cooling section, the belt 4 resists the static pressure of the molten metal to form a mold space. It has a structure that allows necessary cooling water to flow by adjusting the pressure on the inlet and outlet sides of the cooling part 6b.

On the other hand, 0.1 to 0.2 between the belt 4 and the short side mold 5
If there is a gap on the order of mm, molten metal will be inserted into the gap, causing flash. In particular, it occurs at a certain depth from the surface of the molten metal, that is, at the jet section 6a where the solidification shell is thin. Therefore, as shown in FIG. 6, the pressing block 9 pressed by the spring 9a
The belt 4 is pressed against the short side mold 5.
Furthermore, since the belt and the pressing block 9 slide against each other, a sliding member 9b is attached to reduce resistance.

(Problems to be Solved by the Invention) In the above device, the short side mold 5 is connected to the belt 4.
When making it possible to move in the width direction, it is necessary to accurately grasp the position of the short side mold 5 and move the pressing block 9 forward and backward to a position corresponding to that position. As a result, the width cannot be changed. The present invention provides a twin belt type continuous casting machine in which the short side mold 5 is movable.
The purpose is to move the pressing block forward and backward in synchronization with the movement of the short-side mold to facilitate changing the width of the metal ribbon.

(Means for Solving the Problems) The present invention cools and solidifies molten metal poured into a pool portion between a pair of belts, which is partitioned by a short-side mold whose both ends are movable in the width direction. In a twin-belt continuous casting machine for manufacturing thin strips, the belt is moved to the back side of the belt in contact with the short-side mold in accordance with the movement of the short-side mold in the width direction, and the belt is brought into close contact with the short-side mold. In addition to providing a pressing block,
A plurality of disc rolls are provided on the back side of the belt in contact with the molten metal, and are rotatable and connected to the pressing block, and have a boss portion connected to the rotation axis so as to be slidable in the axial direction by a key, Twin-belt continuous casting characterized in that when changing the casting width by moving the short side mold and the pressing block, the disc roll can be expanded and contracted in its axial direction following the movement of the pressing block. It is a machine.

(Examples) Hereinafter, the present invention will be specifically explained by examples with reference to the drawings.

FIG. 1 is a plan view showing a short side mold, a pressing block, and a group of disc rolls for supporting a belt in an embodiment of the present invention, and FIG. 2 is a side view thereof.
These show the state where the casting width is maximum, and FIG. 3 shows the state where the casting width is the minimum. Figure 4 (a) and (b) are Y-Y
A cross section and a Z-Z cross section are shown.

When changing the width of the metal ribbon, the short side mold 5 is moved in the width direction by the driving device 13, and in synchronization with this, the pressing block 18 fitted into the shaft 14 is moved.
is moved in the axial direction to press the belt 4 against the short-side mold from its back surface, bringing the belt into close contact with the short-side mold.

Among the plurality of discs constituting the disc roll group, the boss portions 12a of the discs located at both ends of the disc roll group 12 are each individually fitted to the shaft 14. A keyway 15 is cut in the shaft 14 in the axial direction, and a key 16 is slidably embedded in the keyway 15. The boss portion 12a of each disc is
The key 16 is fitted in such a way that it rotates together with the shaft 14 but slides in the axial direction. The key 16 has hook-shaped projections at both ends, and a hook portion 12 protrudes inside a boss portion 12a to which a disk is attached.
The disks on both sides are connected via b.

The keys K _{1 and K 2 in the key grooves G 1 and G 2} connect the discs R ₁ and R ₂ and R ₃ and R ₄ , and have a structure that they do not open more than a certain distance P ₁ . Similarly, keys K ₃ , K ₄ in grooves G ₃ , G ₄ connect discs R ₂ , R ₃ and R ₄ , R ₅ , so discs R ₁ to R ₅ have key lengths It has expanded to a maximum width W constrained by.

The outermost disc _R1 is restrained by a restraining bracket 18a in the width direction of the pressing block 18, but has a rotatable structure and slides in the width direction in synchronization with the pressing block 18.

When reducing the width, the driving device 17 moves the pressing block 18 to a position corresponding to the moved short side mold 5. At this time, each boss portion 12a can slide in the width direction along the axis 14, and the width can be reduced until the boss portion comes into contact with the adjacent boss portion.

The keys K ₁ to _{K 4} slide relative to the boss portion and are housed within the boss portion. FIG. 3 shows the state at this time.

To widen the width, on the other hand, when the pressing block 18 is pulled out using the drive device 17, the boss portions are moved one after another by keys K ₁ , K ₂ , K ₃ , and K ₄ in the order of R ₁ , R ₂ , R ₃ , and R ₄ . It can be pulled out and the disk roll can be expanded to the required width.

Here, the distance between each boss part is not necessarily uniform in the maximum and minimum range, but in contrast, the distance between the discs is set so that the flatness of the belt is not affected in the maximum and minimum range. and determine the boss length.

As described above, the disc roll group 12 can be automatically expanded and contracted according to the movement of the short-side mold 5.

The disc pitch P ₁ , the rotary boss length P ₂ , and the difference between the maximum width W and the minimum width W' are determined as follows.

(W/W')/2=P ₁ (n-1)-P ₂ (n
-1) = (n-1) (P ₁ - P ₂ ) Since the disk and key are immersed in cooling water, materials that do not corrode, such as rust-free steel, are selected to prevent dust and water from entering. To prevent this, it is effective to seal the discs with a bellows 20 made of sealing rubber or the like. The shaft 14 is connected to the disk by a key 16 so that they rotate together and are supported by end bearings 21 and intermediate bearings 22. The push block 18 and the shaft 14 can be slid and rotated by a bush 18b.

The pressing block 18 is a wear-resistant sliding member 9b.
It has a structure incorporating the belt 4, and slides between the belt 4 and the belt 4 while being pressed by the spring 9a. Therefore, the reaction force F of the force pressing down the belt 4 is transmitted to the shaft 14 and supported by the frame 23 through the bearings 21 and 22.

(Effects of the Invention) As explained above, in the present invention, the short side mold is held down at a position corresponding to the required casting width, and the disc roll group is automatically expanded and contracted to the width that the belt should support. be able to. In this way, high quality metal ribbons with various widths can be easily manufactured according to the present invention.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the embodiment of the present invention with the maximum casting width, Fig. 2 is a side view thereof, Fig. 3 is a plan view showing the minimum casting width, and Fig. 4 is a cross section of the shaft. The figure (a) is a Y-Y cross-sectional view, and the figure (b) is a Z-Z cross-sectional view.
5 is a diagram showing a conventional twin-belt type continuous casting machine, and FIG. 6 is a sectional view taken along line XX. 1... Tanditetsu, 2... Nozzle, 3...
Pulley, 4... Belt, 5... Short side mold, 6a...
...jet part, 6b...pad cooling part, 7...metal ribbon, 8...molten metal surface, 9...pressing block, 9a...spring, 9b...sliding member, 1
0... Header, 11... Nozzle, 12... Disc roll group, 13... Drive device, 14... Shaft, 15
...Keyway, 16...Key, 17...Drive device,
18... Pressing block, 18b... Bush, 2
0... Bellows, 21... End bearing, 22... Intermediate bearing, 23... Frame.

Claims (1)

[Claims] 1. In a twin-belt continuous casting machine that manufactures metal ribbon by cooling and solidifying molten metal poured into a pool section between a pair of belts and partitioned by a short-side mold whose ends are movable in the width direction, A pressing block is provided on the back side of the belt that is in contact with the short-side mold and that moves in response to the movement of the short-side mold in the width direction and brings the belt into close contact with the short-side mold, and the belt is in contact with the molten metal part. A plurality of disc rolls are provided on the back side of the pressing block, are rotatable, and have a boss portion connected to the rotating shaft by a key so as to be slidable in the axial direction, and are connected to the short mold and the pressing block. A twin-belt continuous casting machine characterized in that when the casting width is changed by moving the pressing block, the plurality of disc rolls can be expanded and contracted in the axial direction following the movement of the pressing block.