JPS59183956A - Continuous casting device for plate material - Google Patents

Abstract

PURPOSE:To make the thickness of a billet uniform and to reduce the weight of casting molds by arraying plural casting molds in the advancing direction of the billet to form a tunnel-shaped cavity having a rectangular section and providing the cavity in such a way that the space in the thickness direction of the billet can be adjusted. CONSTITUTION:A casting mold 3 is constituted of a mold 6 in the transverse direction of a billet, a mold 7 which determines the thickness of the billet, and a beam 8 fixed to the mold 6 by means of bolts 14. The plural molds 3 are arrayed in the advancing direction of a billet 5 to form a tunnel-shaped cavity 4 having a rectangular section. Rods 10- are inserted into the beam 8 and the molds are deformed by nuts 11 to adjust the cavity 4 in shch a way that the central part in the width direction of the billet is widened. A molten metal 12 is supplied into the cavity from the nozzle 2 of a tundish 1, and while the molten metal is moved together with the molds 3 from the A point side to the B point side, a solidified shell 13 is formed and the billet 5 is drawn. The molds 3 are cyclically moved in the direction A B C D. The uniformity in the thickness of the billet and the reduction in the weight of the molds are thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting apparatus for plate materials that can uniformize the thickness of slabs and reduce the weight of molds.

There are various apparatuses for continuously casting metal plates such as copper plates or non-metallic plates such as plastic plates. In a mold used for continuous casting, the temperature of the cavity (mold space) side, which is in contact with the molten metal or solidified shell, can reach as high as 500°C when casting molten steel. As shown in Figure 1, the mold (
In α), thermal deformation occurs that narrows the central part on the cavity (b) side when viewed in cross section in the width direction. Such a mold (,
), the slab (c) is cast as shown in Figure 2.
The cross-sectional shape is thick at both ends and thin at the center, making it impossible to obtain slabs with uniform thickness.

Therefore, as shown in Japanese Patent Publication No. 46-26628,
It has also been proposed to increase the thickness of the mold to 250 mm to prevent the cavity side in contact with the molten metal from heating up and expanding, thereby preventing the mold from warping. However, with this method, ■ the mold is thick and inevitably heavy; ■ it is expensive to use copper, which has good thermal conductivity, as the mold material is thick and difficult to remove heat; ■ the mold is heavy and There are disadvantages such as the need for a large supporting force for conveyance, which makes the device easy to damage, and it is difficult to increase the speed.

In view of the above-mentioned points of view, the present invention aims to provide a continuous casting apparatus for the shingle plate side, which makes it possible to obtain slabs of uniform thickness using a mold with reduced weight.

According to the present invention, a means is provided to change the interval between the @-type cavities in contact with molten metal or molten steel, so that the thickness of the slab becomes uniform and the thickness of the mold can be made thinner, thereby reducing the size of the mold can. be able to.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 3, a nozzle (2) that protrudes laterally is fixed to the lower side of the tundish (1), and the tip of the nozzle (2) is connected to a cavity with a rectangular cross section of the mold (3). (4) is inserted within.

The mold (3) includes a mold (6) extending in the width direction of the slab (5),
Molds (7) are arranged on both sides of the mold (6) to determine the thickness of the slab (5), and as shown in FIG. It consists of a beam (8) etc. fixed to the opposite side of the cavity. The plurality of molds (3) are arranged in close contact with each other as a tube group from the point A to the point B of the sixth factor from the upstream side to the downstream side in the direction of movement of the section (5), and form a rectangular shape. The cross-sectional cavity (4) is formed in the shape of a continuous tunnel.

Also, the mold (3) is transferred to the beam (8) by a conveying device (not shown).
The molds (6) and (7) are each equipped with a cooling mechanism (not shown).

The front shape of the beam (8) constituting the mold (3) is a U-shape that does not hinder the installation of the Nando (11), as shown in Figure 5, and the beam (8) has a In the opposite direction, bolt-shaped rods 00) are inserted at the required intervals, and
The rod 00) can be fixed to the beam (8) by screwing the rod 00), and the tip of the rod 00) is screwed into a female thread provided in the mold (6).

During casting work, the mold (6) is deformed by rotating the nut 01), and the molten metal (12) and slab (5) are
Adjust the surface in contact with the cavity (4) so that the center part of the cavity (4) in the direction of one slab becomes wider. Therefore, in this state, the melt 1 (12) from the tanditshu (1) passes through the nozzle (2).
) into the cavity (4) of the mold (6);
Heat is removed by contacting the mold (6) (7), and as it moves with the mold (3) from the A point side to the 8 point side, a solidified shell is formed, becoming a slab (5) and forming a mold group. It is pulled out from the B end.When the mold (3) comes from point A at 8 points and 1, arrow C
Repeat the cycle of moving in the opposite direction to -+D and returning to point A again. The handle (9) also functions as a guide when moving the mold (3). The heat taken from the molten metal 02 and the slab (5) by the molds (6) and (7) is transferred to the outside by the cooling device.

As a cooling device, for example, a circulation hose is attached to each y4 (6) (71), and the hose and A - + B -
+C-+D. Therefore, the mold (
3) is sufficiently cooled when moving from point A to point B, and heat is sufficiently removed from the molten metal 02).

The mold (6) has been deformed in advance so that the interval between the cavities (4) becomes larger at the center in the width direction of the slab in order to counteract the thermal deformation of the slab (c) shown in Figure 2. As the cavity (4) side of the mold (6) thermally expands due to contact with the mold (6), the spacing of the cavities (4) in the width direction of the slab becomes approximately equal to -. Therefore, as shown in Figure 7, slab (5)
The width direction dimension of the slab (
5) The thickness can be kept constant over the entire surface.

In this way, the thickness of the slab (5) can be made constant by forcibly deforming the mold (6), so there is no need to increase the thickness of the mold (6) to prevent thermal deformation. The thickness h of the mold (6) shown in the figure can be approximately 40 m+h.

Modifications of the above embodiment are as follows. By using multiple locations, it is possible to prevent even complicated thermal deformation.

11) Assuming that the beam (8) is a plate-like one that extends also in the A-B direction of the mold (6), the rod 00) and nut (11) are
Two-dimensional thermal deformation of the mold can also be prevented by providing a ring ([U] in the B direction as well.

111) Change the rod 00) and nut 0υ to hydraulic cylinders, adjust the force applied to the mold while the mold moves from point A to point B, and change the thermal deformation conditions at each position from point A to point B. It can also be made to correspond to Instead of a hydraulic cylinder, hydraulic pressure from water or nonflammable hydraulic oil, pneumatic pressure, or electromagnetic force can be used, and various means used for normal servo operation, such as turning the nut (11) with an electric servo motor, can be used. can be applied.

iv) This method can also be applied to preventing thermal deformation of the mold by circulating the mold using a chain or individually using a belt conveyor-like guide.

■) In advance, the center of the cavity is widened by the amount of solidification shrinkage and the mold (3) is positioned at point A, and as it moves toward point B, the center of the cavity is narrowed to prevent sinking of the slab (5). High-speed casting is possible by always maintaining a positive contact pressure between the slab (5) and the mold (6) and efficiently removing heat.

vi) The shape of the beam (8) may be T-shaped instead of U-shaped, and the beam (8) may be attached only at the center of the mold (6).

vii) Measure the thickness of the central part of the slab (5) that comes out of the continuous casting machine, and perform feedback control to control the cavity spacing so that the thickness of the slab (5) becomes a predetermined thickness. You can also do it.

viii) It can be applied not only to metallic materials such as steel plates but also to non-metallic materials such as plastics.

According to the continuous plate casting apparatus of the present invention, various excellent effects as described below can be achieved.

■) By providing a means to deform the mold that forms the cavity, the thickness of the mold part where heat is directly removed has been reduced from the conventional thickness of about 25 mm.
Since it can be reduced from 0 copper to about 40 mm, less than 1/6, the entire mold can be made lighter.

Therefore, the mold can be easily transported and the mechanism can be simplified. For example, it may descend from point D to point A in FIG. 6 and suddenly stop its vertical movement, making it unnecessary to prevent mu when moving in the horizontal direction.

(2) The amount of expensive heat-resistant porcelain used in the mold can be reduced, and the cost of the device can be reduced.

[1] High-speed casting is possible because the mold movement speed is faster.

■) Since the thickness of the slab can be made uniform, the product quality is improved.

■) Complex thermal deformation can be prevented by increasing the number of ways to adjust the shape of the mold.

■) Since the mold can be deformed when moving from the upstream side to the downstream side, it is possible to prevent whiskers on the slab and to maintain a positive contact pressure between the master mold and the slab. High-speed casting becomes possible.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of thermal deformation that occurs in a conventional mold, Figure 2 is an explanatory diagram of the shape of a slab when cast using the mold shown in Figure 1,
The figure is an explanatory diagram of the continuous casting apparatus for plate materials of the present invention, FIG. 4 is a view taken in the N-IV direction of FIG. 6, FIG. The figure is a view taken in the M-■ direction of FIG. 5, and FIG. 7 is a view taken in the ■-■ direction of FIG. In the figure, (1) is the tanditshu, (2) is the nozzle, and (3)
is the mold, (4) is the cavity, (5) is the slab, (6)
(7) is a mold, (8) is a beam, 00) is a rondo, (II) is a nand, (12) is a molten metal, and (13) is a solidified piece.

Claims (1)

[Claims] 1) A continuous plate casting device in which a plurality of molds are lined up in the direction of progress of the slab to form a tunnel-shaped cavity with a rectangular cross section, which is equipped with a device that changes the interval in the thickness direction of the slab between the cavities formed by the molds. Continuous casting equipment for plate materials.