JP4377366B2 - Twin mold - Google Patents

Description

  The present invention relates to a twin mold. More specifically, the present invention relates to a twin mold capable of casting a wide slab material and a narrow slab material.

  In continuous casting equipment, the request to change the width of the slab material is handled by changing the casting width of the mold by changing the position of the short side copper plate, but this is the length of the long side copper plate. It can be handled only within the range. When it is desired to increase the change in casting width beyond this, the long side copper plate may be made as long as possible. However, when a narrow slab is cast with such a wide mold, the productivity is greatly reduced. Therefore, twin molds have been developed to meet the demand for changing the casting width of the slab material and improve the production volume.

As shown in FIG. 5, the twin mold includes a long side copper plate 102 attached to the fixed side long side frame 101, a long side copper plate 104 attached to the movable side long side frame 103, and two movable short sides on the left and right. Frames 106 and 107 and copper plates 108 and 109 attached to them are provided. Reference numeral 105 denotes a tie rod that fixes the front and rear long frames 101 and 103.
In addition to this basic configuration, the partition frame 110 can be inserted into the center of the mold. Copper plates 111 and 112 are attached to both side surfaces of the partition frame 110, and twin casting using both sides of the partition frame 110 is possible. Further, when the partition frame 110 is removed, single casting can be performed.

However, the conventional twin mold has the following problems.
At the time of twin casting, the long side copper plates 102 and 104 may become wrinkled due to a splash insertion at the joint between the partition frame 110 and the long side copper plates 102 and 104 or the thermal effect of the copper plate. The reason for the wrinkles at the joint will be described with reference to FIG.
(1) After mounting the partition frame 110, the pair of long side frames 101, 103 are clamped by the tie rods 105, 105. At this time, the long side frames 101, 103 are bent in a drum shape (illustrated by a curve X), Following this, the long side copper plates 102 and 104 also bend like a drum. For this reason, a gap is formed at the joint between the short-side copper plates 111 and 112 and the long-side copper plates 102 and 104 of the inner partition frame 110, and molten steel tends to be inserted into the mating surface at the initial casting stage, so that flaws are likely to occur. For this reason, the rigidity of the long side frames 101 and 103 is made higher than that of the single casting dedicated mold.
(2) On the other hand, after the start of casting, the temperatures of the long side frames 101 and 103 and the short side copper plates 108 and 109 rise and elongation occurs. In this case, the long-side copper plates 102 and 104 have a very large temperature rise on the side in contact with the molten steel, so that the central portion bulges toward the inside of the mold (illustrated by the curve Y) due to the bimetal effect, and the long-side frames 101 and 103 In addition, a reverse warping phenomenon occurs (illustrated by curve Z), and the joints between the short-side copper plates 111 and 112 and the long-side copper plates 102 and 104 are in strong contact, and the wrinkles become larger.

  As described above, if the long side copper plates 102 and 104 are damaged, twin casting operation is possible, but single casting cannot be performed. In addition, the long-side copper plates 102 and 104 have a short life and high running costs. In order to solve these problems, it is necessary to carefully assemble the partition frame 110, but in this case, productivity is lowered.

Japanese Patent Publication No.1-54148

  An object of this invention is to provide the twin mold which can prevent the damage | wound of the long side copper plate which comprises a mold, and can improve productivity in view of the said situation.

The twin mold of the first invention is a twin mold comprising a mold body formed of a pair of mold long side copper plates and a pair of mold short side copper plates, and a partition unit inserted into and removed from the mold body, The partition unit has a partition part of a water-cooled box structure formed in a cube, and each partition part copper plate is attached to the left and right side surfaces facing the left and right mold short side copper plates in the partition part. The front and back side surfaces facing the pair of mold long side copper plates are respectively provided with hydraulic cylinders that press and urge the mold long side copper plates.
The twin mold according to a second aspect of the present invention is characterized in that the hydraulic cylinder includes a hydraulic chamber formed on both front and back side surfaces of the partition and a pressing plate inserted into the hydraulic chamber.
The twin mold of the third invention is characterized in that, in the first invention, a water supply channel for pouring and discharging cooling water for cooling the partition copper plate is connected to the hydraulic chamber of the hydraulic cylinder.
The twin mold of a fourth invention is characterized in that, in the first invention, the inner partition copper plate has a thickness dimension larger than a thickness dimension of the mold short side copper plate.

According to the first invention, since the distance between the pair of long copper plates can be widened by the hydraulic cylinder, it is possible to avoid strong contact with the middle partition copper plate. For this reason, it is possible to prevent the mold long side copper plate from being scratched, and the productivity is improved because a great amount of time is not consumed for assembling the partition unit.
According to the second invention, since the pressing plate is pushed out by hydraulic pressure, a sufficiently large pressing force can be obtained, and bimetal deformation of the mold long side copper plate can be effectively prevented.
According to the third aspect of the invention, the cooling water for cooling the copper plate can also be used for the driving force of the pressing plate, so that the structure can be simplified without using a special driving source.
According to the fourth aspect of the invention, even in the state where the drum-like bending at the initial stage of casting occurs, the thickness width of the middle partition copper plate is larger than the thickness width of the mold short side copper plate. No gaps occur in the steel, and no molten steel insertion flaws occur.

Next, an embodiment of the present invention will be described with reference to the drawings.
First, the basic structure of the mold body and the partition unit 10 will be described.
FIG. 3 is a plan view of the twin mold according to the present invention. 4 is a cross-sectional view of the twin mold shown in FIG. 3 taken along the line IV-IV.

  In FIG. 3, 1 is a fixed mold long side copper plate, 2 is a movable mold long side copper plate, and the mold short side copper plates 3 and 4 are sandwiched between both ends of the pair of mold long side copper plates 1 and 2. It is. The mold body is formed by the four copper plates 1 to 4, and the casting width can be changed by moving the mold short-side copper plates 3 and 4 closer to or away from each other. 1F is a fixed side long side frame, 2F is a movable side long side frame, and 3F and 4F are both short side frames.

  And 10 is the partition unit of this embodiment, and is provided with the partition part 30 inserted in a mold main body. The middle partition 30 is a cubic water-cooled box, and the middle partition copper plates 11 and 12 are attached to the left and right sides facing the mold short side copper plates 3 and 4. In the case of twin casting, as shown in the figure, the mold is divided into two on the left and right by the partition unit 10, and in the case of single casting, the partition unit 10 may be removed.

As shown in FIG. 4, the partition unit 10 is a generally T-shaped structure in a side view, and includes a mounting frame 20 that extends sideways and a partition 30 that hangs down from the center of the mounting frame 20. . In addition, what was provided with the slab water cooling part extended further downward from the middle partition part 30 is also contained in this invention.
The mounting frame 20 accommodates several water-cooled pipes 21 and 22 therein so that cooling water for the partition 30 can be poured out.

From the central part of the mounting frame 20, the partition part 30 is mounted vertically downward. The vertical dimension of the inner partition portion 30 is the same as the vertical dimension of the mold body, that is, the vertical dimension of the mold long-side copper plates 1 and 2.
The inner partition 30 has a water-cooled box structure, and cools the inner partition copper plates 11 and 12 (see FIG. 3) on both sides from the back surface.

  Further, the mold main body shown in FIG. 4 includes a fixed-side long-side frame 1F to which the above-described mold long-side copper plate 1 is attached and a movable-side long-side frame 2F to which the above-described mold long-side copper plate 2 is attached. The water cooling box structure has a water channel through which cooling water flows on the back surfaces of the long copper plates 1 and 2 of the molds, and has collecting water pipes 5 and 6 for supplying and discharging cooling water from the outside. The collecting water pipe 5 is joined to a water cooling pipe 22 of the mounting frame 20, and the collecting water pipe 6 is joined to a water cooling pipe 21 so that cooling water is supplied and discharged from a water supply source.

Next, the structure of the partition 30 will be described in detail with reference to FIGS.
FIG. 1 is a cross-sectional view of a main part of a twin mold according to an embodiment of the present invention. 2 is a view taken along the line II-II in FIG.
The middle partition 30 of the middle partition unit 10 is configured by combining a left middle partition 30L and a right middle partition 30R.

The left middle partition portion 30L is composed of the middle partition copper plate 11 and the water cooling box 13, and is coupled to each other by bolts 17. The water cooling box 13 has a water passage 15 through which cooling water flows on the back surface of the intermediate partition copper plate 11, and communicates with the water supply / discharge pipe 16 on the mounting frame 20 or the water cooling pipe 22 in the mounting frame 20. In addition, the said partition copper plate 11 is facing the mold short side copper plate 3 (refer FIG. 3) of a mold main body.
The right middle partition portion 30 </ b> R includes the middle partition copper plate 12 and the water cooling box 14, and is coupled to each other by bolts 17. The water cooling box 14 has a water channel 15 through which cooling water flows on the back surface of the middle partition copper plate 12 and communicates with a water supply pipe 16 on the mounting frame 20 or a water cooling pipe 22 in the mounting frame 20. The intermediate copper plate 12 faces the mold short side copper plate 4 (see FIG. 3) of the mold body.

The partition copper plates 11 and 12 have a thickness dimension (T) larger than the thickness dimension of the mold short side copper plates 3 and 4 of the mold body. This large proportion is about 0.1% or less or about 0.2 mm or less.
Thus, when the thickness dimension of the middle partition copper plates 11 and 12 is large, when the long side frames 1F and 2F and the long side copper plates 1 and 2 have a drum-like curve as in the initial casting (FIG. 6 ( Even in A), there is no gap between the partition copper plates 11 and 12 and the long copper plates 1 and 2, and no molten copper is inserted.

A hydraulic cylinder 40 that presses and urges the mold long side copper plates 1 and 2 is provided on both front and back side surfaces of the left side partition 30L and the right side partition 30R.
The hydraulic cylinder 40 includes a hydraulic chamber 41 formed on both front and back sides of the water-cooled boxes 13 and 14, and a pressing plate 42 inserted into the hydraulic chamber 41. As shown in FIG. 2, the hydraulic pressure chamber 41 and the pressing plate 42 are long in the vertical direction, and can be pressed against the long copper plates 1 and 2 at most portions of the vertical dimension. The long side copper plates 1 and 2 are not damaged. The hydraulic chamber 41 is connected to a water supply channel 43 branched from a water channel 15 for pouring and discharging cooling water for cooling the inner partition copper plates 11 and 12.

  Because of the above structure, the pressure plate 42 can push the long copper plates 1 and 2 when the pressure water is supplied to the hydraulic chamber 41 through the water supply channel 43. By pressing the mold long side copper plates 1 and 2 in this way, bimetal deformation that easily occurs during casting (see FIG. 6B) can be suppressed. In order not to push too much, an appropriate stopper is provided between the pressing plate 42 and the hydraulic chamber 41, and the gap between the long copper plates 1 and 2 and the partitioning copper plates 11 and 12 is as follows. It is preferable not to exceed 0.3 mm.

  It is preferable to provide a valve in the water supply passage 43 of the hydraulic cylinder 40 or the like. With this configuration, no liquid pressure is applied at the beginning of casting, and if the copper plate temperature rises during casting, the fluid pressure is increased and pushed by the pressing plate 42 to prevent bimetal deformation of the long copper plates 1 and 2 on the mold side. You can do it. Further, this control may be performed manually or automatically by a timer or the like.

As described above, according to the present embodiment, the distance between the pair of long copper plates 1 and 2 can be widened by the hydraulic cylinder 40, so that strong contact with the partition copper plates 11 and 12 can be avoided. . For this reason, it can prevent that the mold long side copper plates 1 and 2 are damaged.
Further, since the pressing plate 42 is pushed out by the hydraulic pressure, a sufficiently large pressing force can be obtained, and bimetal deformation of the mold long side copper plates 1 and 2 can be effectively prevented.
Furthermore, since the cooling water for the copper plate cooling 11 and 12 can be used as the driving force for the pressing plate 42, the structure can be simplified without using a special driving source.

It is a principal part cross-sectional view of the twin mold which concerns on one Embodiment of this invention. It is the II-II arrow directional view of FIG. It is a top view of the twin mold concerning the present invention. It is the IV-IV sectional view taken on the line of the twin mold shown in FIG. It is a basic composition figure of a twin mold. It is explanatory drawing of the problem of a twin mold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold long side copper plate on the fixed side 10 Middle partition unit 30 Middle partition part 40 Hydraulic cylinder 41 Hydraulic chamber 42 Pressing plate

Claims (4)

A twin mold comprising a mold main body formed of a pair of mold long-side copper plates and a pair of mold short-side copper plates, and a partition unit inserted and removed from the mold main body,
The partition unit has a partition part of a water-cooled box structure formed in a cube,
The left and right side surfaces facing the left and right mold short-side copper plates in the middle partition part are respectively attached with the respective middle-partition copper plates, and the front and back side surfaces facing the pair of mold long-side copper plates are respectively provided with the mold. A twin mold characterized in that a hydraulic cylinder is provided that presses and urges a long side copper plate. 2. The twin mold according to claim 1, wherein the hydraulic cylinder includes a hydraulic chamber formed on both front and back side surfaces of the partition and a pressing plate inserted into the hydraulic chamber. The twin mold according to claim 1, wherein a water supply passage for pouring and discharging cooling water for cooling the intermediate partitioning copper plate is connected to the hydraulic chamber of the hydraulic cylinder. The twin mold according to claim 1, wherein a thickness dimension of the intermediate partition copper plate is larger than a thickness dimension of the mold short side copper plate.

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