Arch bridge type crystallizer for casting blank

Abstract

The utility model discloses an arch bridge type crystallizer for casting blanks, which relates to the field of crystallizers and comprises an inner arc copper plate, an outer arc copper plate and a side arc copper plate, the side arc copper plate is arranged between the inner arc copper plate and the outer arc copper plate, and the middle of the inner arc copper plate and the outer arc copper plate is in an arch bridge shape. The two side edges of the inner arc copper plate and the outer arc copper plate are in a straight plate shape. The distance between the inner arc copper plate and the outer arc copper plate from the middle to the two sides is gradually reduced and is in smooth transition with the position of the straight plate shape. According to the utility model, the transverse and longitudinal extrusion force of the initial blank shell in the aspects of generation and operation is increased, so that the blank shell is more compact, surface cracks of a casting blank are not easy to generate, the surface quality of the casting blank is improved, and the problems of quality degradation loss and defect cleaning loss of the casting blank are reduced.

Description

Technical Field

[0001] The utility model relates to the field of crystallizers, in particular to an arch bridge type crystallizer for casting blanks. Background Art

[0002] The crystallizer is a key equipment in the continuous casting process, which is used to cool the molten metal (usually steel or aluminum) into billets. During the continuous casting process, the molten metal passes through the crystallizer and gradually cools down to form billets of certain specifications, sizes and cross-sectional shapes, which are finally pulled out of the crystallizer.

[0003] The function of the crystallizer is to gradually solidify the metal as it flows through it, forming a shell. The thickness of the shell and the shape of the crystallizer directly affect the quality of the final billet. The crystallizer is usually composed of cooling water pipes, copper plates and other related components. Its design and process have an important impact on the efficiency of the continuous casting process and the quality of the product. In the production of metals such as steel and aluminum, the crystallizer is a key device to ensure the quality of the billet.

[0004] For conventional slab crystallizers, the narrow copper plates have various shapes, including parabolic and upper and lower split forms. The wide copper plates are usually composed of two flat plates, and other forms have not yet been widely used in actual production. However, there are some problems with traditional crystallizers. Specifically, the inner cavity of the crystallizer, which is composed of two flat plates on the wide side, is prone to cracks on the surface of the ingot. This is because the molten steel shrinks in volume during the solidification process, resulting in tensile stress on the surface of the shell. At the same time, traditional crystallizers mostly use narrow-face tapered processes to give the shell of the ingot a certain amount of extrusion, but the extrusion force is difficult to transmit along the lateral shell, thereby increasing the probability of surface cracks in the center of the ingot. Moreover, once the surface cracks are formed, they are difficult to heal due to the lack of lateral extrusion force. Therefore, traditional crystallizers do not provide an opportunity for healing. Utility Model Content

[0005] The utility model aims to provide an arch bridge type crystallizer for casting billets, aiming at the disadvantage that the inner cavity of the crystallizer in the prior art, whose wide surface is composed of two flat plates, easily leads to the generation of cracks on the surface of the casting billet.

[0006] The utility model is realized by the following technical solutions:

[0007] An arch bridge type crystallizer for casting billets comprises an inner arc copper plate, an outer arc copper plate and a side arc copper plate, wherein the side arc copper plate is arranged between the inner arc copper plate and the outer arc copper plate, the middle of the inner arc copper plate and the outer arc copper plate is in an arch bridge shape, and both side edges of the inner arc copper plate and the outer arc copper plate are in a straight plate shape; the spacing from the middle to both sides of the inner arc copper plate and the outer arc copper plate gradually decreases and smoothly transitions to the position of the straight plate shape.

[0008] Preferably, the widths of the inner arc copper plate and the outer arc copper plate are 1545 mm respectively.

[0009] Preferably, the arch bridge width of the inner arc copper plate and the outer arc copper plate is 1500 mm.

[0010] Preferably, the single-side width of the straight plate shape of both side edges of the inner arc copper plate and the outer arc copper plate is 22.5 mm.

[0011] Preferably, the maximum single-side thickness of the arch bridge between the inner arc copper plate and the outer arc copper plate is 10 mm.

[0012] Preferably, the inner cavity arch bridge of the crystallizer starts from the upper opening of the crystallizer, and the depth of the arch bridge along the length direction of the crystallizer is 200 mm.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model increases the lateral and longitudinal extrusion forces of the primary billet shell in the generation and operation, making the billet shell denser, less likely to produce surface cracks on the billet, improving the surface quality of the billet, and reducing the problems of quality degradation losses and billet defect cleaning losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the copper plate arch bridge of the crystallizer in the width direction of the utility model.

[0015] Figure 2 It is a schematic diagram of the copper plate arch bridge of the crystallizer in the height direction of the utility model.

[0016] Explanation of the reference numerals: 1. inner arc copper plate; 2. outer arc copper plate; 3. side arc copper plate. DETAILED DESCRIPTION

[0017] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0018] refer to Figure 1 and Figure 2As shown, the utility model provides an arch bridge type crystallizer for casting billets, comprising an inner arc copper plate 1, an outer arc copper plate 2 and a side arc copper plate 3, wherein the side arc copper plate 3 is arranged between the inner arc copper plate 1 and the outer arc copper plate 2, the middle of the inner arc copper plate 1 and the outer arc copper plate 2 is in an arch bridge shape, and both side edges of the inner arc copper plate 1 and the outer arc copper plate 2 are in a straight plate shape; the spacing from the middle to both sides of the inner arc copper plate 1 and the outer arc copper plate 2 gradually decreases and smoothly transitions to the position of the straight plate shape, the arch bridge type crystallizer adopted by the utility model will process the inner and outer sides of the inner arc copper plate 1 and the outer arc copper plate 2 into an arch bridge shape, and the wide surface of the crystallizer is in the lateral meniscus area and a distance downward, and is subjected to lateral and longitudinal extrusion forces during a period of time when the billet shell is formed and grown, so that the billet shell is not easy to crack, or the cracked primary billet shell can be healed.

[0019] The width of the inner arc copper plate 1 and the outer arc copper plate 2 is 1545mm, wherein the width of the inner arc copper plate 1 and the outer arc copper plate 2 is the use width of the copper plate of the present crystallizer. Since the width section of each crystallizer is different, the width does not affect the form of the inner arc copper plate 1 and the outer arc copper plate 2; the arch bridge width of the arch bridge of the inner arc copper plate 1 and the outer arc copper plate 2 is 1500mm, wherein the arch bridge width of the arch bridge of the inner arc copper plate 1 and the outer arc copper plate 2 is the use width of the copper plate of the present crystallizer. Since the width section of each crystallizer is different, the width does not affect the form of the inner arc copper plate 1 and the outer arc copper plate 2; the straight plate shape single side width of both sides of the inner arc copper plate 1 and the outer arc copper plate 2 is 22.5 mm, the single-side width of the straight plate shape can be changed according to the use requirements, which mainly ensures that the middle main body part is an arch; the single-side maximum of the middle arch bridge between the inner arc copper plate 1 and the outer arc copper plate 2 is 10mm; the inner cavity arch bridge from the upper mouth of the crystallizer to the inner cavity arch bridge of the crystallizer starts from the upper mouth of the crystallizer, and the depth of the arch bridge along the length direction of the crystallizer is 200mm; when actually producing different types of steel with a 1500mm section, the width can ensure that the narrow panel and the wide straight plate are partially in contact, and the corner seam is small, and no corner seam hanging steel will be formed; at the same time, the highest point of the middle arch bridge is 10mm on one side, which ensures that the conventional continuous casting machine (pulling speed ≤1.5m / min) The shell is subjected to moderate force and avoids excessive extrusion pressure due to too large an arch bridge.

[0020] The utility model increases the lateral and longitudinal extrusion pressure of the primary billet shell in the generation and operation, makes the billet shell denser, is not easy to produce cracks on the billet surface, improves the surface quality of the billet, reduces the quality degradation loss and the billet defect cleaning loss; according to the cost of billet hot and cold delivery and quality defect cleaning, the total is calculated at 30 yuan / t. After the implementation of the project, the defect rate is expected to be reduced by 1%, affecting the cost by 0.3 yuan / t.

[0021] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. An arch bridge type crystallizer for casting billets, characterized in that: The invention comprises an inner arc copper plate (1), an outer arc copper plate (2) and a side arc copper plate (3); the side arc copper plate (3) is arranged between the inner arc copper plate (1) and the outer arc copper plate (2); the middle of the inner arc copper plate (1) and the outer arc copper plate (2) is in an arch bridge shape; both side edges of the inner arc copper plate (1) and the outer arc copper plate (2) are in a straight plate shape; the distance from the middle of the inner arc copper plate (1) and the outer arc copper plate (2) to both sides gradually decreases and smoothly transitions to the straight plate shape.

2. The arch bridge type crystallizer for casting a billet according to claim 1, characterized in that: The widths of the inner arc copper plate (1) and the outer arc copper plate (2) are respectively 1545 mm.

3. The arch bridge type crystallizer for casting a billet according to claim 2, characterized in that: The width of the arch bridge of the inner arc copper plate (1) and the outer arc copper plate (2) is 1500 mm.

4. The arch bridge type crystallizer for casting a billet according to claim 3, characterized in that: The straight plate shape of both side edges of the inner arc copper plate (1) and the outer arc copper plate (2) has a single side width of 22.5 mm.

5. The arch bridge type crystallizer for casting a billet according to claim 4, characterized in that: The maximum height of the arch bridge between the inner arc copper plate (1) and the outer arc copper plate (2) on one side is 10 mm.

6. The arch bridge type crystallizer for casting a billet according to claim 1, characterized in that: The inner cavity arch bridge of the crystallizer starts from the upper mouth of the crystallizer, and the depth of the arch bridge along the length of the crystallizer is 200mm.

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