JPH01254355A - Twin belt continuous casting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a twin-belt continuous casting machine, and in particular, it is possible to substantially increase the width of a cast metal strip (hereinafter referred to as slab) produced during continuous casting. This invention relates to a twin belt continuous casting machine that can be changed to a right angle without requiring a run-up section.

[Conventional technology]

Recently, the final shape of steel products has been increased from several mm to several tens of millimeters.
Various continuous casting machines have been proposed that directly produce slabs with a certain thickness from molten steel.

Adoption of this type of casting machine allows for the omission of processes and equipment, resulting in energy savings and equipment costs.

Its development is extremely vigorous as it aims to improve casting yield and material controllability.

The twin belt continuous casting machine targeted by the present invention is one of them.

In particular, as an example of a vertical twin belt continuous casting machine, there is a proposal described in Japanese Patent Application Laid-Open No. 61-279341. Conventionally, this twin belt continuous casting machine also has a thickness of 30 mm.
Similar to the conventional continuous casting method, in which slabs of around 0.05 mm were cast, it was impossible to change the width of the slab during casting in the early stages of development.

As an example, there is a proposal in Japanese Patent Laid-Open No. 189047/1983. Japanese Unexamined Patent Publication No. 60-203345 proposes an improvement on this in which the width of the slab is changed during casting.

[Problem to be solved by the invention]

In the above-mentioned Japanese Patent Application Laid-Open No. 59-189047, when changing the width of the slab, a pair of endless metal belts forming the long side surfaces of the mold, and a short side belt forming the engagement surface of the mold and having a two-stage structure, upper and lower, are used. We temporarily stopped pouring molten steel into the mold made up of
An apparatus has been proposed in which, after lowering the molten steel level to the lower short side opening, the position between the upper short sides is changed to change the width of the mold and then restart injection.

When using this device, not only does productivity drop due to interruption of molten steel injection, but also changes in cooling conditions due to changes in drawing speed, and resulting changes in solidification conditions, cause problems in the molten steel, which is a factor in controlling the material properties of steel materials. Problems such as changes in the inclusion prevention conditions, floating conditions, etc., and variations in the steel material occur.

As a solution to these problems, the
In Japanese Patent No. 203345, an endless short band is sandwiched between an endless metal belt and a guide rail inclined forwardly.

A width changing adjustment device for an endless short side group has been proposed, which includes parallel guide rails, a movable piece that moves both guide rails, a drive device that drives the movable piece, and the like.

When changing the slab width, adjust the moving speed V of the parallel guide rail so that it satisfies V, <Ve-h/1 - (1) from h/V, > f/Vc, The width of the slab is changed by moving the width adjustment device at the short side opening until the endless short side group is clamped by the endless metal belt, and the result is fixed using the clamping force of the endless metal belt. It is.

However, as shown in Fig. 5 of JP-A No. 60-203345, this proposal requires that the run-up section using the inclined guide rail and the parallel guide rail is as long as A + B = L, and that injection into this run-up section is required. The structure is such that there is a meniscus of molten steel. Therefore, JP-A-60-203
In the inclined injection continuous casting machine exemplified in Publication No. 345, when reducing the width, the solidified shell of molten steel (
The shell (hereinafter referred to as the shell) is pushed in by the amount of width reduction by the width-reducing short side opening that is introduced, causing wrinkles to occur on the bottom and side surfaces of the slab, which causes surface defects in the product.

Also, when expanding the width, a new shell is formed between the widened short sides on the outside of the shell of molten steel that has been formed before the widened short sides are sandwiched between the endless metal belts. This causes double skin. This double skin is
Similar to the water wrinkles mentioned above, this causes defects on the product surface.

Therefore, in this prior example of the inclined injection continuous casting machine,
It is very difficult to change the width at high speeds such as V and ζ■o shown by the above formula (1), and it is almost the same as the width change in a normal continuous slab casting machine with a thickness of about 300 mm.
1/100 to 1/1000) The width change speed remained at the VC width change speed. Therefore, the emergence of a continuous casting machine with a mold having a so-called vertical width variable structure that can achieve or exceed the above formula (1) has been eagerly awaited.

An object of the present invention is to provide a twin-belt continuous casting machine that satisfies the above-mentioned needs.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention was completed based on the knowledge obtained by the present inventors as a result of various experimental studies, and there is no need to temporarily stop casting, and the run-up section is also substantially shorter. To provide a twin-belt continuous casting machine that can change the casting width of slabs at right angles during casting without the need for

The basic structural means of the present invention is a pair of endless metal belts that constitute the long sides of a continuous casting mold that is rotatably provided, and a pair of endless metal belts that are attached to the right and left edges of the pair of endless metal belts at predetermined positions. In a twin belt continuous casting machine consisting of a pair of left and right endless short sides that are sandwiched between a metal belt and rotate together with the endless metal belt to form the short side surfaces of the continuous casting mold, , two pairs of inner and outer endless guide rails are provided to support the respective endless short sides and guide the respective endless short side groups at required positions on the right and left edges of the endless metal belt; A driving device for moving to the position is provided, a part of the short side support member between the endless short sides is engaged with one of the inner and outer endless guide rails, and a part of the short side supporting member between the endless short sides is engaged with the other endless guide rail. The means is to engage the remaining short side supporting members between them to form two groups between the endless short sides, and to provide a device for rotationally driving both groups.

The second constituent means includes a pair of opposing endless metal belts constituting the long sides of the continuous casting mold that is rotatably provided, and a pair of endless metal belts that are arranged at predetermined positions on each of the left and right side edges of the pair of endless metal belts. A twin belt continuous casting machine consisting of a pair of left and right endless short sides connected to a large number of short side units that are sandwiched between an endless metal belt and rotate together with the endless metal belt to constitute the short side surfaces of the continuous casting mold, Between the left and right endless short sides, two sets of inner and outer endless guides that support the short side units between the respective endless short sides from both sides and guide the respective endless short side groups to required positions on the left and right side edges of the endless metal belt. The rails are stacked in the direction of the long side surface of the mold, and a moving drive device for moving the inner and outer endless guide rails in a direction parallel to the long side surface is provided, and the distance between the endless short sides is provided. It is divided into two short side unit groups, and both short side unit groups are composed of short side units whose number is at least equal to the number of short side units corresponding to the contact length with the slab, and each short side unit is connected to the mold. It is composed of a short side block that contacts the cast slab to be carried out, a mounting member connected to the short side block, and a short side support member that supports the mounting member, and the The means is to engage all the short side support members of the - side short side unit group, and to engage all the short side support members of the remaining short side unit group with the other endless guide rail.

Furthermore, the third configuration means includes a pair of opposing endless metal belts constituting the long sides of the continuous casting mold that is rotatably provided, and a pair of endless metal belts that are arranged at predetermined positions on each of the left and right side edges of the pair of endless metal belts. A twin belt continuous casting machine consisting of a pair of left and right endless short sides connected to a large number of short side units that are sandwiched between an endless metal belt and rotate together with the endless metal belt to constitute the short side surfaces of the continuous casting mold, Between the left and right endless short sides, three or more sets of endless guides that support the short side units between the respective endless short sides from both sides and guide the respective endless short side units to required positions on the left and right side edges of the endless metal belt. Rails are provided to overlap each other in the direction of the long side surface of the mold, and a moving drive device is provided for moving and moving all sets of outer endless guide rails in the direction of the long side surface, and the endless short side group is moved in the direction of the long side surface of the mold. Divided into groups of short side units equal to the number of sets of guide rails, the number of short side units obtained by subtracting the number of short side units of each set from the total number of short side units is at least the number of short side units equivalent to the contact length with the slab. In addition to the above number, each short side unit is made up of a short side block that contacts the slab carried out from the mold, a mounting member connected to the short side block, and a short side support member that supports the mounting member. and all short side support members of each set of short side unit groups are engaged with each set of endless idle rails.

As a first embodiment, wheels are provided on both sides of the short side support member of the short side group, and the wheels are engaged with a guide groove opened on a side surface parallel to the long side surface of the endless guide rail. The method is to provide guidance on both sides.

As a second embodiment, the endless short side group sequentially connects the short side support members of each short side unit that are engaged with either the inner or outer endless guide rail, and is engaged with the other endless guide rail. The short side support members of the remaining combined short side units are sequentially connected, and both ends of both sequentially connected short side support members are connected through elongated holes to form an endless belt. It is something to do.

As a third embodiment, the short side support part of the short side unit that engages with the inner and outer guide rails is configured continuously by sequentially arranging the clamping material and the clamped material, and the clamping part where both materials overlap. A shaft is inserted into the section to connect the two materials in a rotatable manner, and wheels are provided at both ends of the shaft, and the wheels are engaged with the grooves of the inner and outer guide rails. In the short side support portions of the short side units at both ends of the short side jet group that engages with the inner guide rail and the short side unit group that engages with the inner guide rail, the clamping material of the short side support member at the end of both groups and the A shaft that passes through both materials and rotatably connects them is inserted into the clamping part where the clamping materials overlap, and the shaft is connected to the clamped material of the short side support part of the short side unit that engages with the inner guide rail or This means that wheels are provided on both sides of the elongated hole provided in the holding member, and the wheels are engaged with the guide grooves of the outer guide rail.

As a fourth embodiment, the short side unit that engages with the inner and outer guide rails and the guide rail portions of the inner and outer guide rails are substantially symmetrical with respect to the center plane in the width direction of the short side block, and the inner and outer guide rails are made substantially symmetrical with respect to the widthwise center plane of the short side block. This means that the back surface of the guide rail and the inner surface of the outer guide rail are configured to be slidable.

As a fifth embodiment, the inner and outer guide rails are provided with an internal space that is open on the side closer to the mold when viewed in cross section,
The method is to provide a guide groove opened on a side surface parallel to the long side surface of the mold, and to engage wheels provided on both sides of the short side unit in the guide groove.

As a sixth embodiment, the width dimensions of the short side blocks and the support members of the short side units constituting each of the endless short side groups are made approximately equal to the thickness dimension of the slab, and the width dimension of the outer guide rail is set to be approximately equal to the thickness dimension of the slab. The method is to reduce the thickness to less than the thickness of the piece.

[Effect]

As a representative example of the twin-belt continuous casting machine to which the present invention is directed, FIG. 8 shows the configuration of a vertical twin-belt continuous casting machine. The continuous casting machine 100 is installed under the tundish 101, receives molten steel injected from an injection nozzle 102 attached to the lower surface of the tundish L101 into the mold, and extrudes it downward as a slab 5 while cooling. The slab 5 travels downstream of the mold while being supported by a group of support rolls 60 arranged in multiple throws, and is continuously produced. The mold of the continuous casting machine consists of a pair of opposing endless metal belts 1 (only the front belt is shown in Figure 8).
and the short side surfaces of a pair of left and right endless short side groups 111 and 112 consisting of a large number of movable short side units, which will be described later. A more detailed structure can be found in the above-mentioned Japanese Patent Application Laid-Open No. 1986-
This is explained in Japanese Patent No. 279341.

FIG. 1 is an enlarged front view of the mold part, showing a cross section with the endless metal belt 1 in the front removed.

In the arrangement shown in FIG. 1, the present invention provides two sets of inner and outer guide rails for each of the left and right short side groups, superimposed in the direction of the long side surface of the mold, and the short side groups are arranged in at least two short side groups. Both short side groups are composed of short side units whose number is at least equal to the value obtained by dividing the contact length with the slab by the height dimension of the short side unit, and the short side units of one short side group are is engaged with one of the inner and outer guide rails, and the short side units of the other group (remaining group) of the short side groups are engaged with the guide rails with which the short side groups are not engaged, For example, it is possible to provide rollers that clamp the short-side blocks that are components of the short-side units of both groups, or to provide a rack pinion that engages with a rack gear provided on the mounting member, or to provide a roller that simultaneously performs the clamping and engagement. It is desirable to provide a rotational drive device such as a pinion body to rotationally drive each short side group.

However, a rotation drive device is not necessarily required, and a non-drive system that moves by force from the casting belt and slab may be used.

Therefore, by adjusting the respective positions and relative positions of the inner or outer guide rails, the short side positions of both short side groups are changed, and the width of the slab formed by the left and right endless short side groups is adjusted. This slab width adjustment is performed instantaneously when the boundaries of the two short side groups engaged with the inner and outer guide rails are guided to the position by the inner and outer guide rails whose gap has been adjusted and reach the surface of the molten steel. be exposed. This allows for orthogonal width changes.

Next, the present invention will be described below with reference to FIGS. 1 to 7.

In FIGS. 1 and 2, the short side units of both short side groups constituting each of the left and right short side groups are short side blocks 21. It is composed of a mounting member 22 and a short side support member 23. The short side support member 23 has a sandwiching member 24 and a sandwiched member 25 arranged alternately, and penetrates the overlapped portion of the sandwiching member 24 and the sandwiched member 25 to move both members. They are continuously connected by a shaft 26 that can be connected and wheels 27 provided on both sides of the shaft 26 to form each endless short side group. Further, the above-mentioned alternating arrangement should also be maintained for the portion where the short side units of both groups are connected, that is, the boundary short side units.

As can be seen from Figure 1, when dividing each of the left and right endless short side groups into two groups, it is desirable that the length of each group (equal to the number of short side units) is equal, 50/50, and that the number of short side blocks is equal. Even if 50/50 is an odd number or 50/50 is not possible due to equipment reasons, it is desirable to have 50/50 as close to 50/50 as possible.

Considering the minimum length of each of the above groups, the contact length of the short side block with the slab, that is, the distance from the molten steel surface to the point where the short side block leaves the slab at the bottom end of the mold. The number of short side units corresponding to the contact length is calculated by dividing the distance (contact length) by the height dimension of the short side block (see Figure 3).
) and rounded up. On the other hand,
The maximum length is the total length of the endless short side group minus the minimum length, and it is equivalent to the remaining number after subtracting the number of short side units corresponding to the minimum length from the total number of short side units. do. Practically speaking, it is desirable that the contact length be the distance between the upper tension pulley 2 and the lower drive pulley 3 in consideration of the margin length.

When dividing each endless short side group into three or more short side unit groups, each short side unit group is moved in order, so the remaining number is calculated by subtracting the number of short side units for each set from the total number of short side units. The number may be at least equal to the number of short side units corresponding to the contact length between the short side block and the slab. With such a configuration, when moving the short side units of group A now, the timing when all the short side units of group A are separated from the slab, that is, the short side units of the group outside the front side of A come into contact with the slab. During this time, the position of the endless guide rail responsible for positioning the short side units of group A is changed, and the position of the short side units of group A is changed. This is group B, 0
By repeating the same steps as the groups, the width dimension of the mold can be changed by sequentially moving the short side units of each group.

If the length of each group changes, the timing of changing the position of the inner or outer guide rail, which will be explained later, will change, and it goes without saying that it is better to have as much margin as possible. It is desirable to divide them into two groups (equally divided in the case of three or more groups).

The inner guide rail 12 and the outer guide rail 13 are arranged as shown in FIGS. 1 and 4. As is particularly clear in FIG. 4, the width dimension Lw of the short side unit is equal to the gap between the endless metal belts 1, that is, the slab thickness B.

Therefore, it is preferable to provide them in an overlapping manner in the direction of the long side of the slab (that is, in the width direction of the slab). In this way,
This means that the width of the overlapping portion in the long side direction can be reduced.

Therefore, if the center lines of at least the guide rail portions of the inner and outer guide rails 12 and 13 are aligned, the width of the guide rail portion of the outer guide rail 13 will be the typical value (
maximum width), which is a desirable condition for design.

Specifically, the center line 40 of the A-Δ cross-sectional view shown in FIG. It is better to match the center line (or center plane). In other words, the short side groups are configured in a substantially symmetrical form with respect to the center line 40, and at least the guide rail portions of the inner guide rail 12 and the outer guide rail 13, preferably up to the moving drive device, are arranged symmetrically. Good.

The inner guide rail 12 and the outer guide rail 13 each include a guide groove 28 that opens in a direction parallel to the long side surface, and engages the guide groove 28 with the wheels 27 and 32. Since the external force from the slab applied to the short side block 21 is applied to the inner and outer guide rails 12.13 through the wheels 27.32, it is also an important factor to improve the compatibility of the inner and outer guide rails 12.13.

As a result of various studies on this point, the inventors of the present invention found that it is desirable that the inner and outer guide rails 12, 13 are always integrated. That is, the inner guide rail 12
It has been found that a structure that ensures close contact between the back surface of the outer guide rail 13 and the inner surface of the outer guide rail 13 and allows sliding if necessary, that is, a structure that has a cross-sectional shape shown in Fig. 4.5 and contacts over a wide area, is recommended. confirmed.

Considering this as a structure of a guide rail, the inner and outer guide rails 12 and 13 have an internal space that is open on the side closer to the mold when viewed in horizontal cross section, and side surfaces parallel to the long side surface in the internal space. The guide groove 28 is opened in the guide groove 2.
8 is suitable for engaging wheels 27, 32 provided on both sides of the short side unit.

By creating the structure as explained above, the structure shown in Fig. 4 (a
), the endless short side group of the present invention can be inserted between the endless metal belts 1. In particular, the structure in which the guide rail portions of the inner and outer guide rails 12 and 13 are inserted between the endless metal belts 1 means that the width dimension of the short side block 21 of the short side unit and the short side support member 23 is the thickness dimension of the slab.

, and furthermore, the outer guide rail 13
The width dimension, B, is to be equal to or less than the thickness dimension, B, of the slab.

In this way, the depth of the short side block 21 (LD in FIG. 3)
By increasing the width of the mold, it becomes possible to significantly increase the amount of width change of the mold at one time of width change, and at the same time, it is possible to obtain the remarkable effect of increasing the continuous cumulative width change amount.

However, as the thickness of the slab to be manufactured becomes thinner, the requirements become more severe, and there also appears to be a limit width for the above structure.

Based on the above considerations, considering the technical problem of the present invention, as mentioned above, the thinner the short side support member 23 is, the more important it is to properly balance the acting force and moment applied to the short side unit. , unequal forces are generated, leading to local wear, abnormal noise, local heat generation, etc.

Therefore, the relationship between the force and moment acting on the short side unit from the slab (or molten a) side is added to the sectional view taken along line AA in FIG. 4(a) in FIG. 7.

In the same figure, an external force F+ due to uniform pressure from the slab acts on the tip surface 211 of the short side block 21 at right angles to the surface, and the force is applied to the end surface 211 of the short side block 21. Mounting member 22 and short side support member 2
3 to the outer guide rail 12, and the central plane 40
F7 and Fi as reaction forces from the guide grooves 28 on the left and right sides of
acts.

If the distance between the acting forces between the central plane 40 and Fi is 37, and the distance between the acting forces at F is S, then the relational expressions between the acting force and the moment are the following equations (2) and (3). .

Ft to F7+Fl...(2) F7 X
S7 =FllXSi ·' · (3) Therefore, one of the desirable answers is to make F7 and F equivalent and to make S7 and S equivalent.

The present inventors conducted various studies on the structure of the short-side unit in order to satisfy the dimensional limitations and at the same time properly balance the acting force and moment acting thereon, and as a result, the following findings were obtained.

■ Arrange the two sets of guide rails one on top of the other in the long side direction of the mold, preferably align the center lines (or center planes) of the two sets of guide rails, and arrange them symmetrically with respect to the center line. That's true.

■ Therefore, each short side unit also has a symmetrical structure,
It is desirable to have a structure in which wheels are also provided on both sides and the wheels are engaged from both sides with guide grooves.

- The short side group is composed of two groups of short side units, and all the short side units are sequentially connected to form an endless belt, and the structure is such that the short side units of each group can be positioned using guide rails.

Furthermore, in order to satisfy the above findings, we devised the following points regarding the structure of the endless short-sided group.

■ The structure of the short side units, especially the structure of the short side support members ■ How to combine the short side support members of the second group of short side units and the two sets of guide rails ■ How to connect the two groups of short side units ■ How to connect the two groups of short side units Guide rail structure Based on the study results, we organized the essential requirements and additional requirements, and determined the following configuration as a possible horizontal bend of an endless short side group.

■ Two sets of guide rails are placed one on top of the other in the long side direction of the mold to form the inner and outer guide rails.

(2) Divide the short side units constituting the endless short side group into two or more groups taking into account the above quantity.

■ The short side units of one group are engaged with one guide rail, the short side units of the other group are engaged with the other guide rail, and the short side units of both groups are also connected to each other to form an endless belt-like structure. shall be.

■ Provide separate positioning devices for the inner and outer guide rails so that they can be operated separately.

A device combining the above configurations is '1°4' according to claim 1.
The structure according to claim 2 is a detailed structure that takes practicality into consideration. Also, each short side unit of the short side group is 3
The structure according to claim 3 is divided into groups or more.

A desirable detailed device designed to balance the acting force and moment with the structure between the short-side unit and the inner and outer guide rails, and to allow the short-side unit to travel smoothly on a defined track with less play. is the structure according to claim 4.

It goes without saying that it is desirable that the wheels are bearings, and that the guide groove be close to the outer diameter of the bearing and that there be less gap than necessary.

Regarding the method of connecting the many short side units that make up the short side group, we have adopted an endless belt-like configuration, and all the short side units are divided into two groups, so that the short side units of the two groups can be positioned separately. is the structure according to claim 5.

The horizontal bending according to claim 6 makes the detailed structure of the short side support member of the short side unit desirable.

The structure according to claim 7 is a structure in which the desirable basic structure of the inner and outer guide rails is made easier to balance the acting force and the moment.

Furthermore, the structure according to claim 8 is such that the guide grooves in the inner and outer guide rails are of a desirable dual support type.

By specifying the width dimensions of the short side unit and outer guide rail, it is possible to significantly increase the amount of mold width change per width change, and at the same time, it is possible to increase the amount of continuous cumulative width change. The structure according to claim 9 is configured such that the

Regarding the direction of width expansion or width reduction in the above mold right angle modification method, if the telescoping starting point is placed in the middle of the telescoping stroke, the modification width is effective in either direction of addition or subtraction with respect to the basic width dimension. becomes. When the starting point is placed at the maximum width stroke position, the change width is effective only in the decreasing direction with respect to the basic width dimension. Further, when the starting point is placed at the minimum width stroke position, the change width is effective only in the increasing direction with respect to the basic width dimension.

This will be specifically explained using FIG. 6. In Figure 6,
If the vertical axis is the time axis and the two groups of short sides have the same length, the time it takes for the boundary of each short side group to make a half-circle around the endless guide rail is defined as r, and this τ is expressed as a unit. The horizontal axis indicates the tip of the short side unit, and the position of the casting surface of the short side block in contact with the slab, the position of the outer guide rail and the inner guide rail, and the position of the short side unit in contact with the slab. The position of the guide rail supporting and positioning the short side block is shown by a solid line, and the position of the guide rail when the short side block is not in contact with the slab is shown by a dotted line.

Since the length of each group is half of the total circumference, the time required for the total length of each group to pass through the contact range with the slab is 1 or more as the length of the solid line, and is 1.4τ in the figure. represents.

If the casting surface position of the short side block is positioned by the outer guide rail, the distance between the short side block casting surface position 0 and the outer guide rail position is the fixed length of the beam, and the position is determined by the inner guide rail. In this case, the distance between the casting surface position of the short side block and the inner guide rail position is a fixed length of L2, and the beam between the inner and outer guide rails can be expanded and contracted from L4 to L4, usually at a position intermediate between L3 and L4. L.S.
[Knee% (L3+L4)].

Now, Figure 6 shows the time chart of the infinite short side group on the right when the short side group on one side is expanded by 180 cities. L4-
L, = IQ (assuming 1 mm, according to Figure 6, 0 to
Between τ, the short side block of the short side unit of group b is supported by the outer guide rail, and between τ and 2r, the short side block of group a of the short side block is supported by the inner guide rail, so the outer guide rail is supported. When all of the short side blocks of group b are separated from the slab, move the outer guide rail 50 degrees toward the inner guide rail to create a space between the inner and outer guide rails. These 1-2
7, the width of the slab has not yet started to change, so it is zero, so in FIG. 6, 0 is written next to the Lo line.

Between 2τ and 3τ, group b of the short side blocks supporting the slab has already moved 50 places between 1 and 21, so the position of the short side blocks at time 0 is 0. In comparison, it is spread by 50 ann on one side. Therefore, when the boundary between groups a and b reaches the surface of the molten steel, the width of the slab is expanded by 50 strokes on one side. After that, when the front part of the short side block that does not support the slab is separated from the slab, the inner guide rail is moved 100 mm away from the outer guide rail to create a gap between the inner and outer guide rails.

Similarly, between 3τ and 4τ, the outer guide rail is 1
Since it moves 00111ffl, the distance between the inner and outer guide rails becomes L3, and the position of the casting surface of the short side block is as above. 100m+n on one side.

Between 4τ and 5τ, the inner guide rail moves 80 stops, so the distance between the inner and outer guide rails is L3+80mm, and the position of the casting surface of the short side professional hook is as above.

150mm on one side. Then 5τ~6τ
In between, the outer guide rail moves 30 m, so the distance between the inner and outer guide rails becomes L3 + 50 III = LS, and the casting surface position of the short side block is 180 mm on one side with respect to L0, so the mold moves by 180 mm on one side. is completed. Therefore, at the end of changing the mold width dimension, it is necessary that the sum of the amounts of movement of both guide rails be equal.

Further, the operation shown in FIG. 6 is similarly performed when narrowing the width of the mold. Therefore, L.

It is desirable to set the distance between The structure must be such that it can be inserted into the

If the short side group on one side is widened by 30++on, which is less than the maximum width change per time (for example, 100 mm), referring to Figure 6, the outer guide rail will support between 1 and 21. When all the short side units of group b of the short side block are separated from the slab, move the outer guide rail to 30
Expand fflI11. When the first short side unit of group b of the short side blocks reaches the molten steel surface between 2τ and 3τ, the slab spreads 30 squares on one side.

Then, when all of group a of the short side blocks supported by the inner guide rail are separated from the slab, move the inner guide rail 3
Expand by 0mm. Then, when the short side unit at the head of group a of the short side block reaches the surface of the molten steel between 3τ and 4τ, group a of the short side block also expands by 30++on, so it is the same as group b before it. position and the width change ends here. Therefore, the inner and outer guide rails are
It can be seen that the movement ends with a movement of 0[l1m. Narrowing the width is also carried out in the same manner.

In FIG. 6, the explanation has been made on the assumption that the two groups constituting the endless short side group are of equal length. Although the present invention is not limited to this, the only difference is that the timing width of the width change becomes narrower as the equality is shifted, and the other points are the same as in the case of FIG. 6.

As a result, the cause of the occurrence of unsteady width parts of the slab when the width is changed and the causes of occurrence of hot water wrinkles, type 2 skin, etc. on the surface of the slab, which existed in the conventional technology proposed in JP-A No. 60-203345, were eliminated. It disappears.

The above explanation describes the case where an endless short side group is divided into two short side unit groups, but it is of course possible to divide an endless short side group into three or more short side unit groups. The principles regarding actions and mechanisms that govern the constituent elements apply to groups 3 and above, with the same principles as those of group 2, even if the structure becomes slightly more complex. Therefore, detailed explanations of the effects, mechanisms, etc. of three or more groups have been described above with respect to only the different points, and the others have been omitted.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In this example, the present invention is applied to a vertical continuous casting machine.

In FIG. 1, 1 is an endless metal belt constituting the long side of the continuous casting mold, 2 is a tension pulley of the endless metal belt 1, 3 is a drive pulley of the endless metal belt 1, and 4 is the molten steel surface ( (also referred to as a meniscus), and 5 is a slab that is solidified and transported.

11 does not show the short side group of the present invention that constitutes the short side surface of the continuous casting mold. This short side group 11 is a left short side group 1 arranged symmetrically at a predetermined position on both left and right edges of the endless metal belt 1.
11 and a right short side group 112. 12 is one of the guide rails that guides each of the left short side group 111 and the right short side group 112, and is an inner guide rail. 13 is another guide rail, which is an outer guide rail. Reference numeral 14 indicates a drive device for moving the inner guide rail 12 laterally, and reference numeral 15 indicates a drive device for moving the outer guide rail 13 laterally. In this example, hydraulic cylinders are used for both the drive devices 14 and 15 for left and right movement. 16 is a drive device 14 for left and right movement.
and 15 are mounting brackets, and 17 is a rotation drive device that drives the short side blocks 21 and/or mounting members 22 of the short side groups 111 and 112 by sandwiching and/or engaging them with rollers and/or rack binions 18; Groups 111 and 11
When moving from side to side (2), it is provided so that it can be moved integrally with the gripping and occlusal state.

The engagement between the inner and outer guide rails 12 and 13 and both short side groups 111 and 112 will be explained based on the left short side group 111.

The left short side group 111 in this example is a combination of a large number of short side units, and the short side unit of short side group a, which is made up of half of the short side units, engages with the inner guide rail 12, and The short side units of the short side groups constituting the remaining range are engaged with the rail 13.

The structure in which the short side units of each short side group a and b engage with the inner and outer guide rails 12, 13 will be explained based on FIG. 2.

In the figure, 21 is a short side block of the continuous casting mold, 22 is a mounting member for the short side block 21, 23 is a short side support member connected to the mounting member 22, and 24 and 24b are supports for adjacent short side blocks 21. A clamping member configured to connect the members 23; 25 and 25b are members to be clamped by the clamping members 24 and 24b.

26 is the sandwiching material 24.24b and the sandwiched material 25.25b.
The clamping material 24.24b and the clamped material 2
5.25b is rotatably inserted into the shaft, 27 is the shaft 2
These are wheels attached to both ends of 6. Therefore, each short side unit has a short side block 21 . It is composed of a mounting member 22 and a short side support member 23.

In this example, by inserting each of the wheels 27 into the grooves 28 provided in the inner and outer guide rails 12.13, the short side units of the short side groups a and b are engaged with the inner and outer guide rails 12.13. be done.

In this example, each short side support member 23 of the short side units of short side groups a and b that engages with the inner and outer guide rails 12.13 shortens the clamping member 24.24b and the clamped member 25.25b. Every other side block 21 is arranged alternately and connected to a mounting member 22, respectively.

In this example, the material to be held 25 of the short side unit of short side group a
is connected to the mounting member 22 via the clamping member 24a in the middle, but the present invention is not limited to this, and the clamped member 2
5 may be extended and connected directly to the mounting member 22.

The difference between the short side units of short side group a and short side group A is that the short side support member 23 of the short side unit of short side group a engages with the inner guide rail 12 and the short side unit engages with the outer guide rail 13. This is the length of the short side support member 23 of the short side unit of the short side group.

In addition, when considering the part where short side groups a and b are connected, that is, the short side support member 2 of the boundary short side unit of short side group a
3, the boundary short side unit of the short side group is the outer guide rail 13
A wheel 27 is also provided at a position where it engages with the outer guide rail 13, and the wheel 27 is also engaged with the inner guide rail 12 of the short side support member 23.
An elongated hole 29 is provided between the wheel 27 and the wheel 27 engaged with the outer guide rail 13 so as to be extendable and retractable.

In addition, the connecting portion between short side group a and short side group A is such that each support member 23 of the boundary short side unit is used as a clamping member 24 for short side group a, and as a clamped member 25b for short side group A, or It is preferable to use the opposite combination, and not to place the clamping members 24 together or the clamped materials 25 apart. In this way, the short side units of short side groups a and b can be positioned independently.

The rotational drive of the short side block 11 in this example is driven by a motor through the shaft of the rack pinion 18 that meshes with the rollers that sandwich the short side block 21 and the rack gear provided on the mounting member 22. Apparatus 17 was used. This driving device 17 is not an essential requirement, and a non-driving system may also be used.

The rotation drive device 17 used in the present invention is not limited to this example, and any known means may be used. A device that does not cause wear on the clamping surfaces is desirable.

Further, from a structural point of view, it is desirable to have a rotation drive device 17 that drives the short side block 21 and the mounting member 22 protruding from the outside of the outer guide rail 13.

With the above structure, in order to change the width dimension of the slab 5 during continuous casting, the inner guide rail with which the short side units of the short side group a engage, as described above with reference to FIG. 12 remains as it is, and when the short side unit of the short side group rotates to the non-molten steel injection side, move the outer guide rail 13 in the changing direction (
When the short side unit of the short side group A rotates toward the molten steel injection side, the short side unit of the short side group A moves at the boundary between the short side group a and the short side group A by the amount of movement determined by the above movement amount. Change the single width dimension. After that, when all the short side units of short side group a rotate to the non-molten steel injection side, the inner guide rail 12
Move the bond by the same amount as the changing direction of the outer guide rail 13. Then, even at the boundary between the short side group and the short side group a, the slab width dimension will be the changed value and there will be no step.

With the structure explained above, the short side unit of short side group a is supported and guided by the inner guide rail 12, so depending on the position of the inner guide rail 12, the contact surface with the slab in short side group a The casting surface 211 of the short side block is
The position of is determined.

The short side unit of the short side group is supported by the outer guide rail 13,
Guided by inner and outer guide rails 12. 13 has a telescopic structure, so the position of the casting surface 211 of the short side block in the short side group is the outer guide rail 13.
It will be determined by the position of

The distance between the inner and outer guide rails 12 and 13 can be changed due to the telescopic structure.
It is usually adjusted to an intermediate distance.

To help understand FIG. 2, FIG. 3 shows a front view thereof.

FIG. 3 shows the short side unit of the short side group having the minimum dimension between the inner and outer guide rails. At this time, the pin 30 is located at the position closest to the inner guide rail 12 of the elongated hole 29. Therefore, if Figure 3 is an enlarged view of the left short side group 111 in Figure 1, directly above the molten steel surface, when the boundary between short side groups a and b reaches the molten metal surface, the width of the mold expands at a right angle. I can understand what happens.

The cross-sectional views of the short side unit at three points, A-A point in the short side group a, B-B point at the boundary between the short side group a and C-0 point in the short side group a in Fig. 3, are shown respectively. Figure 4(a)~
(C).

FIG. 4(a) shows a cross section A-A taken along a line extending from a line passing through the center of the shaft 26 and wheels 27 of the short side unit that engages with the outer guide rail 13 to the center line 40 of the short side block 21.
shows. As is clear from this figure, the outer guide rail 1
A wheel 27 is engaged with the guide groove 28 of No. 3 via the shaft 26 in a state where it is supported on both sides.

FIG. 4(b) shows the center line of the shaft 26, wheel 27, and elongated hole provided at the overlap between the clamping material 24 and the clamped material 25 of the boundary short-side unit at the boundary of the short-side group a, and the inner A cross section B-B is shown along a line connecting the center lines of the shaft 26 and the wheel 27 engaging the guide rail. As is clear from this figure, the shaft and the wheel are engaged with the guide groove 28 of the inner guide rail 12 and the guide groove 28 of the outer guide rail 13 in a dual-supported state. Inner guide rail 12 and outer guide rail 13
is provided with an internal space that is open on the side closer to the mold when viewed in cross-sectional view, and has a guide groove that is open on the side surface in a direction parallel to the long side surface of the mold and engages with the wheels of the short side unit. There is.

FIG. 4(C) is a cross section taken along a line extending from the center line of the shaft 26 and wheel 27 connecting the head of short side group a and the second short side unit to the center line of the second short side unit. C-
Indicates C. A clamping member 24 connected to the mounting member 22 and a clamped member 25 through which the shaft 26 of the wheel 27 engaged with the guide groove 28 of the inner guide rail 12 passes are connected by welding.

Instead of the clamping member 24, a clamped member 25 may be extended and connected to the mounting member 22 by direct welding.

FIG. 5(a) shows, in a horizontal cross-sectional view, the situation in which the outer guide rail 13 is connected to the left-right movement drive device 15 via the mounting bracket 16. As shown in FIG. 5(a), the outer guide rail 13 is extended rearward beyond the inner guide rail and is spaced apart on the extendable long side between the inner and outer guide rails, and is shaped into a specific shape.
It is connected to the mounting bracket 16 with a pin. The mounting bracket 16 is fixed to the tip of the lateral movement drive device 150 rod.

In Fig. 5 et al.), the inner guide rail 12 is attached to the mounting bracket eye 6.
The cross section shows the state in which it is connected to the left-right movement drive device 14 via. The inner guide rail 12 is extended at the rear to have a specific shape and is connected to the mounting bracket with a pin. The mounting bracket is fixed to the tip of the rod of the left-right movement drive device 14.

In the present invention, the depth of the short side block 21 (100+n+n in this example) is the maximum change dimension per width change (
The depth of the short side block 21 is determined based on the required dimension for one width change.

In this example, when the width was changed 50 times in the range of 10 to 80 degrees on one side of the mold, there was no irregularity in the width of the slab, and there were no wrinkles or double skin, and the process was smooth.

It was possible to stably and continuously cast 2,500 tons of molten steel.

Although this example is an example in which the present invention is applied to a vertical continuous casting method, the present invention can also be applied to the above-mentioned inclined injection type continuous casting machine as one of the conventional technologies related to twin belt continuous casting machines. The effects obtained by application are the same as those obtained in the above-mentioned embodiments.

〔Effect of the invention〕

Since the present invention is constructed, operated, and operated as described above, when changing the width dimension of a slab during casting, the run-up section required at the introduction section on the pouring side is substantially unnecessary. Therefore, there is no unsteady part in the width of the slab, and there is no cause for wrinkles or double skin on the surface of the slab.
The effects obtained are significant, such as a significant improvement in casting yield.

Furthermore, since the short side support members of all the short side units of the endless short side group are connected in the form of one endless belt, there is no adjustment work between two or more groups, and it can be used smoothly for long periods of time. became.

In addition, by supporting each short-side unit with the inner and outer guide rails, the balance of acting force and moment can be maintained at all times, significantly suppressing abnormal noise and local wear. This not only extends the lifespan but also makes maintenance easier.

In addition to making the structure of the short side unit and the inner and outer guide rails bilaterally symmetrical, the back surface of the inner guide rail and the inner surface of the outer guide rail are made slidable, resulting in a good balance between acting force and moment, and resistance to external forces. It has become possible to increase rigidity and reduce structural play, improving reproducibility and accuracy of movement.

As mentioned above, by specifying the width dimensions of the short side unit and outer guide rail, it is possible to
The amount of change per turn can be greatly increased, and at the same time, the cumulative amount of continuous width change can be increased, so the time required to change the width can be shortened, and at the same time, the length of the slab in the transient situation associated with width change can be shortened. Yield can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a front view illustrating the configuration of a continuous casting machine in an embodiment of the present invention, and Fig. 2 is a perspective view of essential parts illustrating the engagement status of each short side group and each guide rail in an embodiment of the present invention. ,
3 is a front view of FIG. 2, and FIGS. 4(a) to 4(C) are taken along line A-A in FIG. 3, respectively. A cross-sectional view taken along lines B-B and C-C, FIG. 5 is a cross-sectional view showing the connection state of the moving drive device via the short side group and a bracket, and FIG. 6 is a cross-sectional view showing the connection state of the moving short side in the present invention. FIG. 7 is a time flow diagram showing the operation, FIG. 7 is a force relationship diagram in which the forces acting on the A-A sectional view of FIG. 4 are plotted, and FIG. 8 is an overall conceptual diagram of the vertical twin belt continuous casting machine. Patent applicant Nippon Steel Corporation Representative
Masu Kobori (and 2 others) Figure 2 Figure 3 Figure 4 Figure 6

Claims (1)

[Scope of Claims] 1. A pair of endless metal belts constituting the long side surfaces of a continuous casting mold that is rotatably provided, and a pair of endless metal belts at predetermined positions on each left and right side edge of the pair of endless metal belts. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups which are sandwiched between and rotated together with the endless metal belt to form the short side surfaces of the continuous casting mold, each of the left and right endless short side groups is provided with a Two pairs of inner and outer endless guide rails are provided for supporting the endless short side groups and guiding each of the endless short side groups to required positions on the right and left edges of the endless metal belt, and for the inner and outer endless guide rails to guide the endless short side groups to the required positions. each with a moving drive device,
A part of the short side support members of the endless short side group is engaged with one of the inner and outer endless guide rails, and the remaining short side support members of the endless short side group are engaged with the other endless guide rail. A twin-belt continuous casting machine characterized in that the endless short side group is composed of two groups, and a device for rotationally driving both groups is provided. 2. A pair of opposing endless metal belts constituting the long sides of a continuous casting mold that is rotatably provided, and a metal belt that is sandwiched between the endless metal belts at required positions on each of the left and right side edges of the pair of endless metal belts. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups connected to a large number of short side units that rotate together with an endless metal belt and constitute short side surfaces of the continuous casting mold, the left and right endless short side groups Then, on the long side of the mold, two sets of endless guide rails, one for supporting the short side unit of each endless short side group from both sides and for guiding each endless short side group to the required positions on the right and left edges of the endless metal belt, are attached to the long side of the mold. a driving device for moving the inner and outer endless guide rails in a direction parallel to the long side surface, and dividing the endless short side group into two short side unit groups; Both short-side unit groups are composed of short-side units whose number is at least equal to the contact length with the slab, and each short-side unit is constituted by a short side unit that is in contact with the slab to be carried out from the mold. It is composed of a side block, a mounting member connected to the short side block, and a short side support member that supports the mounting member, and the entire length of the one short side unit group is attached to either the inner or outer endless guide rail. A twin belt continuous casting machine characterized in that the side support members are engaged with each other, and all the short side support members of the remaining short side unit group are engaged with the other endless guide rail. 3. A pair of opposing endless metal belts constituting the long sides of a continuous casting mold that is rotatably provided, and a metal belt that is sandwiched between the endless metal belts at required positions on each of the left and right side edges of the pair of endless metal belts. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups connected to a large number of short side units that rotate together with an endless metal belt and constitute short side surfaces of the continuous casting mold, the left and right endless short side groups In addition, three or more sets of endless guide rails are installed on the long sides of the mold to support the short side units of each endless short side group from both sides and guide each endless short side group to required positions on the right and left edges of the endless metal belt. A driving device for moving all sets of endless guide rails in the direction of the long side surface is provided, and the endless short side groups are arranged in short side units equal to the number of sets of the guide rails. divided into groups, and the number of short side units obtained by subtracting the number of short side units of each set from the total number of short side units is at least the number of short side units corresponding to the contact length with the slab, and
Each short-side unit is composed of a short-side block in contact with the slab carried out from the mold, a mounting member connected to the short-side block, and a short-side support member that supports the mounting member; A twin belt continuous casting machine characterized in that all of the short side support members of each of the short side unit groups are engaged with the endless guide rail of the twin belt continuous casting machine. 4. Wheels are provided on both sides of the short side support member of the short side group, and the wheels are guided on both sides by engaging with guide grooves opened on the side surfaces parallel to the long side surface of the endless guide rail. The twin belt continuous casting machine according to any one of claims 1 to 3, characterized in that: 5. The endless short side group is formed by sequentially connecting the short side support members of each short side unit that are engaged with either the inner or outer endless guide rail, and the remaining short side group that is engaged with the other endless guide rail. Claims 1 to 3 are characterized in that the short side support members of the short side units are sequentially connected, and both ends of both sequentially connected short side support members are connected through elongated holes to form an endless belt shape. 4. The twin belt continuous casting machine according to any one of 4. 6. The short side support part of the short side unit that engages with the inner and outer guide rails is constructed in a continuous manner by sequentially arranging the clamping material and the clamped material, and the clamping part and the clamped material overlap each other. A shaft is fitted that penetrates both materials and connects the two materials in a rotatable manner, and wheels are provided at both ends of the shaft, and the wheels are engaged with the grooves of the inner and outer guide rails, and the wheels are connected to the outer guide rails. In the short side support portions of the short side units at both ends of the short side unit group that engage with the short side unit group and the inner guide rail, the sandwiched members of the short side support members at the ends of both groups and the sandwiched A shaft that penetrates both materials and connects them rotatably is fitted into the clamping part where the materials overlap, and the shaft is connected to the clamped material of the short side support part of the short side unit that engages with the inner guide rail or The twin belt according to any one of claims 1 to 5, characterized in that wheels are provided on both sides of the elongated hole passing through the elongated hole provided in the holding member, and the wheels are engaged with guide grooves of the outer guide rail. Continuous casting machine. 7. The short side unit and the guide rail portion of the inside and outside guide rails that engage with the inside and outside guide rails are substantially symmetrical with respect to the center plane in the width direction of the short side block, and the back surface of the inside guide rail and the outside guide 7. The twin belt continuous casting machine according to claim 1, wherein the inner surface of the rail is configured to be slidable. 8. The inner and outer guide rails are provided with an internal space that is open on the side closer to the mold when viewed in cross section, and provided with a guide groove that is open on the side surface parallel to the long side surface of the mold, and in the guide groove is provided with an open space on the side closer to the mold. The twin belt continuous casting machine according to any one of claims 1 to 7, characterized in that wheels provided on both sides of the unit are engaged. 9. The width of the short side blocks and supporting members of the short side units constituting each of the endless short side groups shall be approximately equal to the thickness of the slab, and the width of the outer guide rail shall be equal to or less than the thickness of the slab. The twin belt continuous casting machine according to any one of claims 1 to 8.