JPH09122835A - Method for changing thickness of mold for continuous casting and mold thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly change various thickness and sizes in one-line by dividing and butting short side copper plates of a mold for continuous casting to the right and the left sides in wedge like, relatively shifting the divided short side copper plates and changing the thickness of the mold for continuous casting. SOLUTION: The copper plates forming the short side copper plate of the continuous casting mold 1 are made into the structure composed of two divided plates 2a, 2b at the right and the left sides having the divided surfaces in the upper and the lower sloping direction. The divided plates 2a, 2b are made a fixed plate in one side and a shiftable plate in the other side. In this case, the divided plate 2b having wider width at the lower part is taken as the fixed side. In the fixed side divided plate 2b, a foot roll 3 is fixed to the copper plate side, too. The long side copper plate 51 and back frames 52, 52 are released and the movable side dividing plate 2a is slid in the vertical direction to execute the change of the thickness. By this method, the time needed for the change in the thickness can drastically be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting mold thickness changing method and apparatus.

[0002]

2. Description of the Related Art Conventionally, when changing the cross-sectional dimension of a mold for continuous casting of steel, the width direction of the slab is conventionally changed by sandwiching the short side copper plate movably inside the long side copper plate of the mold and online A technique of adjusting by moving the side is known. On the other hand, it was not easy to change the slab thickness online.

The following techniques (a) and (b) are available as techniques for changing the thickness of a continuous mold online. (A) As shown in FIG. 9, the short side copper plate 61 can be easily attached and detached, and the short side copper plate 61 is replaced. According to this technique, a locking portion 68 protruding from the back surface of the short side copper plate 61 is provided, a recess 66 is provided in the back frame 62, and the short side copper plate 61 is suspended in the mold from above, and the recess 66 and the locking portion 68 are provided.
Is locked and attached. 10 to 13 are explanatory views of the short side copper plate replacement step and show the cross section of the short side of the slab 1. First, the short side cover 69 is removed (FIG. 10), and the short side copper plate 61 is lifted and removed by the crane 71 (FIG. 11).
A short side copper plate 72 having a width dimension corresponding to the thickness of the slab that is different from the short side copper plate 61 is hung to lock the locking portion (FIG. 12).
Clamp the long side and short side and attach the short side cover (Fig. 1
3) Complete replacement of short side copper plate. In FIG. 9, 63
Is a foot shoe, 64 is a short side clamp device, 65 is a mold cooling water passage, and 67 is a secondary cooling water passage. (B) As shown in FIGS. 14 to 15, the long side copper plate 82 is stepped in the thickness direction, and the joining surface is changed so that the short side copper plate 81 is joined to the stepped portion or steplessly. Technology to change the thickness by doing so.

[0004]

Conventionally, when changing the size of a mold in continuous casting, the mold and the frame are usually replaced in a lump with another size. 2-3 for this exchange
It takes time. In order to shorten the exchange time and improve the productivity, it is desired that the thickness of the mold can be changed online.

If the thickness can be changed online and the change work can be performed within several tens of minutes, it greatly contributes to the improvement of productivity and the reduction of lead time. Typical conventional online thickness changing techniques include the techniques (a) and (b) described above. However, each has the following drawbacks. (A) In the method of exchanging the short side copper plate, a hanging tool for exchanging the short side copper plate such as a gate crane and a handling device are required around the mold, a space is required around the mold, and the exchange time is 30 minutes.
It is relatively long, ~ 60 minutes. Further, the short side copper plate and the back frame are joined to each other by a fitting type engagement or a clamp, so that the attaching accuracy is not so good and the joining portion is not sufficiently reliable.

(B) In the technique of utilizing the stepping of the long side copper plate, the thickness is limited to only two sizes, and the thicker size is a fixed type having one width, and there are many restrictions in application. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a novel method for changing the thickness of a continuous casting mold and a mold that can be quickly changed to various thickness dimensions online.

[0007]

The present invention has been developed to solve the above problems. That is, the present invention is characterized in that the short-sided copper plate of the continuous casting mold is wedge-shaped and divided into left and right parts and abutted, the divided short-sided copper plate is relatively moved online, and the thickness of the continuous casting mold is changed. And a method for changing the thickness of the continuous casting mold.

The continuous casting mold of the present invention, which can suitably carry out the above-mentioned method of the present invention, has a butt structure of two split plates which are wedge-shaped and are slidably movable vertically. The continuous casting mold is characterized by including the short-sided copper plate and a drive device that changes the thickness of the mold by relatively moving the two divided plates online. In this mold, it is preferable that one of the two divided plates whose lower side is wide is fixed to the foot roll and the width changing mechanism, and the other divided plate is movable. A position adjusting cylinder that connects the back frames of the left and right split plates may be used as the driving device, and a spring or a ram is used instead of the cylinder, and the driving device that changes the thickness is a thickness adjusting device on the long side. May also be combined.

Further, it is preferable to provide stoppers corresponding to the maximum thickness and the minimum thickness cast pieces on the movable side of the two divided plates to prevent slipping off. The sliding surface of the butt structure of the two divided plates is preferable. If a guide mechanism is provided in the, the thickness can be easily changed. Further, if the cooling water passage slit structure of the two divided plates is arranged in a fan shape along the shape of the copper plate and the passage cross-sectional areas of the cooling water passage slits are made uniform, the flow velocity of the cooling water can be made uniform. This is preferable because the heat removal of the short side copper plate can be made uniform.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the drawings. 1 to 8 show an embodiment of the present invention. As shown in FIGS. 1 and 2, the copper plate forming the short side copper plate of the continuous casting mold 1 has a structure composed of left and right divided plates 2a and 2b having divided surfaces in the upper and lower diagonal directions. 1 shows the case where the thickness of the slab is small, and FIG. 2 shows the case where the thickness of the slab is increased.

One of the split plates 2a and 2b is a fixed plate and the other is a movable plate. In FIG. 1 and FIG. 2, the dividing plate 2 having a wide lower portion in FIG.
b is the fixed side. In the fixed-side split plate 2b, the foot roll 3 is also fixed to the copper plate side. When changing the thickness,
The long side copper plate 51 and the back frames 52, 52 are released, and the movable side split plate 2a is slid vertically. FIG. 2 shows a case of increasing the thickness of the slab. After releasing the long side copper plates 51, 51, the movable side dividing plate 2a of the short side copper plates is pushed downward to increase the width of the short side of the mold. Increase the thickness of the slab. On the contrary, when reducing the thickness of the slab, after slightly loosening the long-side copper plates 51, 51, the movable-side split plate 2a of the short-side copper plates is pulled upward while sliding on the joint surface.

The short side copper plates 2a and 2b are attached to the back frame 5 as shown in FIGS. In the illustrated example, the copper plate 2b is integrally fixed to the back frame 5. Since the copper plates 2a and 2b are water-cooled, water supply / drainage pipes 7 and 8 are connected to the respective back frames 5. Further, a width changing cylinder 6 or a worm jack or the like is connected to the back frame 5. It is efficient in terms of space to dispose the water supply / drainage pipes 7 and 8 as shown in FIG.

Further, the movable side dividing plate 2a of the short side copper plate is required to have sufficient strength against the static iron pressure and it is necessary to slide while keeping contact with the dividing plate 2b when changing the width. 5
As shown in FIG. 2, the fixed-side split plate 2b and the movable-side split plate 2a
A contact maintaining mechanism is provided on the sliding part of. For example, when the movable side division plate 2a slides, the fixed side division plate 2b on the sliding surface
In order to increase the adhesion between the movable side division plate 2a and the movable side division plate 2a, a parallel maintaining mechanism such as an arimizo 20 is provided.

As shown in FIG. 4, the driving device for sliding the movable side dividing plate 2a is a cylinder 9, 1 whose position can be adjusted.
2 or a spring in the pulling direction or the like is provided instead of this. The mutual connection is made by the mounting brackets 10, 11, 13, 14
Is used. For cylinders 9 and 12 with position adjustment function,
As shown in FIG. 4, the thickness can be adjusted. However, when using a spring or the like, a stopper for the maximum thickness and the minimum thickness of the slab is provided, and at the time of thickness adjustment, the long side back frame 52 is temporarily released. Then, by driving the thickness adjusting device on the long side, the thickness is adjusted in a direction in which the thickness is reduced by a force greater than the reaction force of the spring.

Further, since the fixed side and movable side division plates 2a and 2b have a triangular shape, it is difficult to form the cooling water passage slit. For example, FIGS. 6-8 show one of the solutions. FIG. 7 shows a short-sided copper plate (for example, the movable-side split plate 2
It is a longitudinal cross-sectional view of a). FIG. 6 is the DD arrow view, FIG.
Is a view as seen from the arrow EE. As shown in FIGS. 7 and 8, by changing the width of the slit 7a of the water passage 7 in the vertical direction of the mold,
The water passage is fan-shaped along the dividing plate, and as a measure against uneven heat removal due to changes in the flow velocity, the slit depth of the part where the slit width becomes narrow is increased and the slit cross-sectional area of any part is made uniform. Make the flow rate of the cooling water uniform and make the heat removal uniform. With the above configuration, it is possible to quickly change the thickness online without impairing the heat removal characteristics.

[0016]

EXAMPLES Sizes (thickness of slab) according to the present invention and conventional methods: 2
It was applied to the thickness change of 00, 240, 260 mm and compared. In the prior art, the method of changing the thickness was to collectively replace the mold and the dedicated body with the DG stand, and in the embodiment of the present invention, the change was performed by online thickness adjustment using the cylinder with position adjustment.

The thickness changing time and the effect are summarized in Table 1.

[0018]

[Table 1] ──────────────────────────────────── Prior art Invention 1) Thickness change time 2 0.5 hr / cycle 0.15 hr / cycle 2) Effects (1) Productivity improvement (production volume) 100 (index, base) 120 (2) Lead time reduction 10 times / month 30 times / month Merit 100 (index) , Base) 115 (3) Inventory reduction (merit) 100 (index, base) 110 ──────────────────────────────── ─────

[0019]

EFFECTS OF THE INVENTION According to the present invention, it is possible to change the thickness in the conventional manner by 2-3
It took time, but now it can be reduced to about 10 minutes. Therefore, productivity in normal production is increased by about 20% due to the effect of extending production time.

[Brief description of the drawings]

FIG. 1 is a side view of a mold according to an embodiment.

FIG. 2 is a side view of the mold of the example.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 4 is a view taken in the direction of arrows BB in FIG. 3;

FIG. 5 is a view taken in the direction of the arrows CC in FIG. 4;

FIG. 6 is a front view of a split plate.

FIG. 7 is a side view of the dividing plate.

FIG. 8 is a rear view of the split plate.

FIG. 9 is a cross-sectional view of a conventional short side exchange type mold.

FIG. 10 is a cross-sectional view of a conventional short side exchange type mold.

FIG. 11 is a replacement process diagram of a conventional short side replacement method.

FIG. 12 is a replacement process diagram of a conventional short side replacement method.

FIG. 13 is a replacement process diagram of a conventional short side replacement method.

FIG. 14 is a cross-sectional view of a conventional thickness changing mold.

FIG. 15 is a cross-sectional view of a conventional thickness changing mold.

[Explanation of symbols]

1 Mold 2a Movable side division plate 2b Fixed side division plate 3 Foot roll 5 Back frame 6 Cylinder 7, 8 Water supply / drainage pipe 7a Slit 9 Cylinder 10, 11 Bracket 12 Cylinder 13, 14 Bracket 20 Arimizo 51 Long side copper plate 52 Back frame

Claims (8)

[Claims] 1. The thickness of the continuous casting mold is changed by dividing the short-sided copper plate of the continuous casting mold into wedges and abutting them, and moving the divided short-sided copper plates relatively online. A method for changing the thickness of a continuous casting mold. 2. A continuous casting mold, a short-sided copper plate having a butt structure of two split plates which are divided into left and right in a wedge shape and can be slidably moved in the vertical direction, and the two split plates. And a drive device for changing the thickness of the mold by relatively moving the mold online. 3. The one of the two split plates whose lower part is wide is fixed to the foot roll and the width changing mechanism, and the other split plate is movable. Item 3. A continuous casting mold according to item 2. 4. The continuous casting mold according to claim 2, wherein the driving device is a position adjusting cylinder that connects the back frames of the left and right split plates. 5. The continuous casting mold according to claim 4, wherein a spring or a ram is used instead of the cylinder, and the drive device for changing the thickness also serves as the thickness adjusting device on the long side. 6. The casting mold for continuous casting according to claim 2, further comprising stoppers corresponding to the maximum thickness and minimum thickness cast pieces of the mold provided on the movable sides of the two divided plates. 7. The continuous casting mold according to claim 2, further comprising a guide mechanism provided on a sliding surface of the abutting structure of the two divided plates. 8. The cooling water passage slit structure of the two divided plates is arranged in a fan shape along the shape of the copper plate, and
The continuous casting mold according to claim 3, wherein the cooling water passage slit has a uniform passage cross-sectional area.