JPH055574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuous casting device for thin slabs comprising a circulating body on the long sides of the mold, and particularly to a fixed mold holding device suitable for changing the width of the mold. .

[Conventional technology]

In the conventional apparatus, as described in Japanese Patent Application Laid-Open No. 169141/1983, a method is known in which the back plate portion of a fixed mold is fixed and held on the casting machine main body frame side with bolts or holding slopes.

On the other hand, in conventional continuous casting machines for thick slabs,
As shown in Fig. 7 in Tetsu to Hagane, Vol. 67 (1981), No. 8, pp. 3-15, the short side mold is placed between the long side molds using a short side clamping device. It is held by being held directly. When changing the slab thickness direction of the mold, the short side mold is slid by the short side driving device using the long side mold as a guide surface while relaxing the clamping force of the short side clamping device. It has become a good mechanism.

[Problem that the invention seeks to solve]

Of the above-mentioned conventional techniques, in the former, it is necessary to maintain a constant distance between the side of the fixed mold and the cooling frame, which is necessary for passage of the circulating body and the water cooling the circulating body. If this distance is not maintained uniformly over the entire length of the fixed mold, it will be difficult for the circulating body to pass through for a short period of time, and the supply of water to cool the circulating body will decrease despite the increased sliding resistance. The problem was that the temperature of the body rose, which further caused a decrease in the temperature, eventually leading to breakage.

In addition, in the multiple part, the force of pressing the circulating body against the short side mold part by the cooling water pressure is insufficient due to a pressure drop due to the large distance between the water channels, so the injected molten metal is likely to be inserted into the sliding surface. , This results in belt circulation failure and solidified shell breakage (also called breakout).
There are many cases where this occurs.

However, in the above-mentioned conventional technology, the width of the slab is only controlled by holding the back plate of the fixed mold with a holder such as a bolt. No consideration was given to remote control of changes, and the production equipment was not technically able to handle it.

On the other hand, the latter does not use a circulating body for long sides,
Since the mold for the short side is directly sandwiched between the fixed mold for the long side, there are fewer problems with pouring hot water, and the width can be easily changed because the mold for the long side can be used as a guide. It has been difficult to apply this technique to a continuous casting machine that requires a space between the short-side mold and the long-side cooling frame for the circulation body to pass through.

The first object of the invention is to provide a continuous thin cast slab that is arranged between opposing running parts of a circulating body and that can easily set the distance between a pair of mold members extending in the casting direction of the slab and a cooling frame. Our objective is to provide casting equipment.

The second object of the invention is to facilitate the setting of the interval between the cooling frame and a pair of mold members disposed between the opposing running parts of the circulating body and extending in the casting direction of the slab, and to Another object of the present invention is to provide a continuous casting device for thin slabs that can move a mold member in the width direction of the slab.

[Means for solving problems]

In order to achieve the purpose of the first invention,
In the second invention, a pair of circulating bodies are arranged opposite to each other, a cooling frame is disposed on the back surface of the opposing surface running portion of the pair of circulating bodies, and extends to an outer range in the width direction of the circulating bodies; In a continuous thin slab casting apparatus, a casting space is constituted by a pair of mold members disposed between opposing running parts of a circulating body and extending in the casting direction of the slab, each of the mold members having the The plate member is connected to a plate member extending in the width direction of the slab on the back side of the casting space, and the plate member is provided on one side of the cooling frame in an outer range in the width direction of the circulation body forming the casting space. The cooling frame is held by a fixed guide provided on the other side of the cooling frame and an elastic guide whose distance from the cooling frame surface can be changed.

In order to achieve the purpose of the second invention,
In the second invention, a pair of circulating bodies are arranged opposite to each other, a cooling frame is disposed on the back surface of the opposing surface running portion of the pair of circulating bodies, and extends to an outer range in the width direction of the circulating bodies; In a continuous thin slab casting apparatus, a casting space is constituted by a pair of mold members disposed between opposing running parts of a circulating body and extending in the casting direction of the slab, each of the mold members having the The plate member is connected to a plate member extending in the width direction of the slab on the back side of the casting space, and the plate member is provided on one side of the cooling frame in an outer range in the width direction of the circulation body forming the casting space. The plate member is held by a fixed guide provided on the other side of the cooling frame and an elastic guide whose distance from the cooling frame surface can be changed. This device is equipped with a width changing device that moves in the direction.

[Effect]

In the first invention, one surface of the plate member connected to the back side of the casting space of the mold member is connected to the fixed guide provided on the cooling frame, and the other surface of the plate member is connected to the elastic member provided on the cooling frame. By holding the mold member with the guide, it is possible to maintain a predetermined distance between the cooling frame and the mold member by the outer range of the circulating body constituting the casting space.

In the second invention, the mold member can be changed in the width direction of the slab by further providing a width changing device in addition to the first invention.

〔Example〕

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

FIG. 1 shows an embodiment of the invention. FIGS. 2 to 5 show FIG. 1 in more detail. The circulating body mold 1 is made into an endless one by welding or the like, and is hung around guide rollers 2, 3 and a tensioning roller 4, and is circulated by driving the guide roller 3. The circulating body mold 1' is disposed oppositely.
A pair is formed with a predetermined interval. A pair of fixed molds 5, 5' inserted between both circulating body molds 1, 1' are assembled near the side edges, and both side surfaces of the fixed molds are in a sliding relationship with the circulating body molds 1, 1'. A casting space is formed while maintaining the

The fixed molds 5, 5' are made of a copper-based material with good thermal conductivity, and back plates 6, 6' are bolted to the back of the molds to ensure rigidity. A width changing drive device 7 for changing the width of the mold is connected to the ends of the back plates 6, 6', and it not only applies an external taper to the fixed molds 5, 5' to change the width, but also applies an external taper in the width direction of the slab. It holds and fixes the load, and has a uniform thickness.

From the cooling frames 8, 8', the circulating body mold 1,
Cooling water is pumped to the back side of 1', and the circulating body mold 1,
1' and the molten steel 9 are cooled. Guide surfaces 10 and 11 are provided between the cooling frames 8 and 8' and the back plate 6 outside the passage range of the circulating body molds 1 and 1' in the width direction of the slab.
is a fixed surface whose positional relationship with the surface of the cooling frame 8' does not change, and the other guide surface 11 is held by a hydraulic actuator 12, a spring 13, etc., and has a mechanism that can change its positional relationship with the surface of the cooling frame 8. have.

A movable bearing 15 is provided at the lower end of the back plates 6, 6', which slides in the slab width direction by the thrust of the mold width changing drive device 7 and is connected to the back plates 6, 6' by pins 14. The position of the back plates 6, 6' is maintained against the pull-out resistance.

In the above combination, as shown in FIG.
The relationship with 6' is shown by the following equation.

2G+B=2S+H ∴S=G+B-H/2 Here, S is the distance between the surface of the cooling frame 8, 8' and the back plate 6, 6', and G is the distance between the surface of the cooling frame 8, 8' and the fixed mold 5. , 5', B indicates the thickness of the fixed molds 5, 5', and H indicates the thickness of the cooling frame 6, respectively. That is, if the distance G between the surfaces of the cooling frames 8, 8' and the fixed molds 5, 5' is determined by considering the thickness of the circulating body molds 1, 1' and the thickness of the cooling water film, the protrusion of the guide surface 10 The amount S can be determined. Furthermore, the stability of the gap G depends on the clamp length, the protrusion amount L of the fixed mold, the clamp force, etc., so these can be determined appropriately with respect to the load.

The width is variable and the taper is provided using the guide surfaces 10 and 1.
The back plates 6, 6' have a uniform thickness with respect to the guide surfaces 10, 11 while being clamped between the back plates 6, 6'.
This can be done by sliding the gap G, and in this case as well, the distance G can be maintained at a predetermined value.

On the other hand, assuming that the clamping surfaces of the back plates 6, 6' are worn out or deformed, a level consisting of screws, wedges, etc. is provided to the guide surface 10 to enable the level change, as shown in FIG. If the adjustment device 16 is provided, the workability of setting the distance G can be further improved.

Further, according to this embodiment, even if the fixed molds 5, 5' are moved by the width changing device 7 during casting, the cooling frame 8,
8' and the fixed molds 5, 5' can be maintained at a predetermined distance, so that there is no possibility of insufficient supply of cooling water to the back surface of the circulating body molds 1, 1' or sliding of the circulating body molds 1, 1'. the cooling frame 8, 8' and the fixed mold 5,
5', without causing friction or excessive load with the circulating body molds 5, 1', and the possibility of inability to circulate or breakage of the circulating body molds 1, 1' during operation can be greatly reduced.
Another effect is that the life of 5' can be greatly extended.

〔effect〕

In the first invention, it is possible to easily set the interval between the cooling frame and the pair of mold members disposed between the facing running parts of the circulating body and extending in the casting direction of the slab, and to set the interval. The work can be done extremely easily and in a short time.

In the second invention, it is possible to easily set the interval between the cooling frame and the pair of mold members arranged between the opposing surface running parts of the circulating body and extending in the casting direction of the slab, and furthermore, during casting, Since the mold member can also be moved in the width direction of the slab, the casting space can be easily changed.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing one embodiment of the present invention, FIG. 2 is a view in the direction of the − arrow in FIG. 1, FIG. 3 is a view in the direction of the − arrow in FIG. 2, and FIG. - An arrow view, FIG. 5 is an enlarged view of FIG. 3, and FIG. 6 is a diagram showing a level adjustment device. 1, 1'... Circulating body mold, 5, 5'... Fixed mold, 6, 6'... Back plate, 7... Width changing device, 8, 8'... Cooling frame, 10... Fixed guide, 11...Elastic guide, 16...Level adjustment device.

Claims (1)

[Claims] 1. A pair of circulating bodies disposed opposite to each other, and a cooling frame disposed on the back surface of the opposing surface running portions of the pair of circulating bodies and extending to the outer range in the width direction of the circulating bodies. , a thin slab continuous casting apparatus that constitutes a casting space by a pair of mold members disposed between opposing running parts of the circulation body and extending in the casting direction of the slab, each of the mold members having a casting space; , connected to a plate member extending in the width direction of the slab on the back side of the casting space, the plate member being connected to one side of the cooling frame in an outer range in the width direction of the circulating body forming the casting space. 1. An apparatus for continuously casting thin slabs, characterized in that the device is held by a fixed guide provided on the other side of the cooling frame and an elastic guide provided on the other side of the cooling frame and whose distance from the surface of the cooling frame can be changed. 2. A pair of circulating bodies disposed opposite to each other; a cooling frame disposed on the back surface of the opposing surface running portions of the pair of circulating bodies and extending to an outer range in the width direction of the circulating bodies; In a continuous thin slab casting apparatus, a casting space is constituted by a pair of mold members disposed between surface running parts and extending in the casting direction of the slab, each of the mold members having a rear surface of the casting space. a fixed guide provided on one side of the cooling frame in an outer range in the width direction of the circulating body forming the casting space; , is held by an elastic guide provided on the other side of the cooling frame and whose distance from the cooling frame surface can be changed, and further provided at an end of the plate member for moving the mold member in the slab width direction. A continuous thin slab casting device characterized by being equipped with a width changing device.