TWI583460B - Method for improving properties of head end of metal slab in continuous casting production - Google Patents

Description

Improve the quality of the head end of metal embryos produced by continuous casting Methods

The present invention is directed to a method of improving the quality of the tip end of a metal blank produced in a continuous casting process.

Please refer to FIG. 1A and FIG. 1B , which are respectively schematic diagrams of a conventional preparation for the continuous casting of metal embryos, and a schematic diagram of the drawing during the casting. The continuous casting apparatus 10 can be used to produce metal embryos such as aluminum embryos. In general, the continuous casting apparatus 10 mainly includes a bottom mold 12 and a side mold 14, wherein the side molds 14 are disposed on the side of the bottom mold 12 to form a cavity that can carry the molten metal 16. During the casting, the molten metal 16 flows into the cavity, and is subjected to heat extraction of the bottom mold 12 and the side mold 14. The molten metal forms a metal shell 20 near the bottom mold 12 and the side mold 14 due to temperature drop. After the molten metal 16 is filled to a certain height, the bottom mold 12 starts to gradually descend. When the solid shell 20 is sprayed by the cooling water 24, the cooling speed is increased, and as the temperature drops, the metal shell 20 gradually thickens until the molten metal 16 Completely solidified. In this process, since the internal and external cooling rates are inconsistent, the metal casing 20 is unevenly contracted, and is generated between the bottom molds 12. The gap 22, the larger the gap 22, represents that the metal casing 20 shrinks more unevenly, and the probability of defects is also higher.

As shown in FIG. 1A and FIG. 1B, in order to prevent leakage of the molten metal 16 initially filled into the cavity from the gap between the bottom mold 12 and the side mold 14, the continuous casting apparatus 10 is provided with a mold clamping patch 18 or the like. Functional joints. The mold-bonding patch 18 is attached to the inner side surface of the side mold 14 and the upper surface of the bottom mold 12 adjacent to the side mold 14 with a bonding agent to cover the gap between the bottom mold 12 and the side mold 14, thereby preventing the gap. The molten metal 16 leaks.

As shown in FIG. 1B, if the cooling water 24 is flushed into the gap 22 between the bottom mold 12 and the metal head end and accumulates therein, the uneven shrinkage of the metal shell 20 is more pronounced, and the gap 22 is larger. The proportion of defects generated will also be higher. Therefore, if the cooling water 24 can be prevented from entering the gap 22 between the bottom mold 12 and the metal blank, the gap 22 can be remarkably reduced, and the probability of occurrence of defects can be further reduced.

At present, in order to prevent the cooling water 24 from entering the gap 22, the water deflector is used to block and discharge excess cooling water, or to reduce the flow of water into the gap 22 by means of an air knife to blow off the cooling water. However, the sealing ring used as the water retaining plate is made of rubber, which is liable to fail due to high temperature, and the water retaining effect is also affected by the shape and surface unevenness of the metal embryo. On the other hand, air knives have the disadvantage of being difficult to operate and high equipment costs. For example, "Method and apparatus for removal of cooling water from ingots by means of water jets", which is proposed by US Patent Publication No. 20090301683A1, Its air knife design can blow off residual cooling water, but The operating interval is not easy to control, and the blown cooling water has a backlash into the mold, causing doubts about the soup explosion. In addition, the position of the water retaining plate and the air knife is located below the side mold, and the water retaining effect for the initial casting is not obvious.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for improving the quality of the head end of a metal blank produced by continuous casting, which has one end of a part of the mold-fit patch bonded to the outer side of the bottom mold and the other end joined to the inner side of the side mold. Therefore, the cooling water sprayed to the bottom end of the bottom mold and the metal embryo can be blocked, thereby effectively preventing the cooling water from rushing into the gap between the bottom mold and the metal embryo, thereby reducing the degree of uneven cooling of the casting embryo, and effectively improving the metal embryo. The quality of the head end.

The method for improving the quality of the head end of the metal embryo produced by the continuous casting method utilizes the mold clamping patch originally used to prevent the leakage of the molten metal from the bottom mold and the side mold, and can be changed through a slight modification process. The mold-fit patch has both a leak-proof and a good water-blocking effect. Therefore, by using this method, the effect of the quality of the head end of the metal embryo can be effectively improved without additional cost and equipment investment.

In accordance with the above objects of the present invention, a method for improving the quality of the tip end of a metal blank produced by continuous casting is proposed. In this method, a mold-fit patch is provided, wherein the mold-fit patch comprises two parts. The first portion is attached to the inner side surface of the side mold of the continuous casting apparatus and the upper surface of the bottom mold of the continuous casting apparatus to have a function of preventing metal liquid from leaking out. The second part is bent and extended to the inner side of the side mold, and the outer side of the bottom mold forms a good water curtain.

According to an embodiment of the present invention, the mold clamping patch has a flexible refractory cloth or a refractory sheet, and is attached to a gap between the bottom mold and the side mold to prevent the first filling into the cavity without solidification. The molten metal leaks from this gap.

10‧‧‧Continuous casting equipment

12‧‧‧Bottom mode

14‧‧‧ side mode

16‧‧‧metal liquid

18‧‧‧Molding patch

20‧‧‧Metal shell

22‧‧‧ gap

24‧‧‧Cooling water

100‧‧‧Continuous casting equipment

102‧‧‧Bottom mode

104‧‧‧ side mode

106‧‧‧metal liquid

108‧‧‧Molding patch

200‧‧‧Metal shell

202‧‧‧ gap

110‧‧‧Part 1

112‧‧‧Part II

114‧‧‧Cooling water

116‧‧‧ first end

118‧‧‧ second end

120‧‧‧ first end

122‧‧‧ second end

124‧‧‧ inside

126‧‧‧ upper surface

128‧‧‧Outside

130‧‧‧ bottom

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. The description of the drawings is as follows: FIG. 1A is a schematic diagram showing the preparation of a conventional metal preform for continuous casting. FIG. 1B is a schematic view showing a continuous casting of a conventional metal embryo in the case of drawing and drawing; [FIG. 2A] is a schematic view showing the preparation before continuous casting according to an embodiment of the present invention; 2B is a schematic view showing the drawing of the casting according to an embodiment of the present invention.

In view of the conventional technology for avoiding the cooling water rushing into the gap between the bottom mold and the metal embryo, the sealing apron of the water retaining plate is easily damaged by high temperature, and the water retaining effect is affected by the shape and surface quality of the metal embryo. The disadvantage of the air knife is that it has the disadvantage of being difficult to control. Therefore, the present invention proposes a method for avoiding the cooling water from entering the gap between the bottom mold and the metal embryo by extending the mold clamping patch. The inner side surface of the side mold and the outer side surface of the bottom mold can effectively block the cooling water from entering the gap between the bottom mold and the metal embryo, and can greatly reduce the occurrence of metal embryo warping and straight crack defects.

2A and 2B, wherein FIG. 2A is a schematic view showing the preparation of a metal embryo for continuous casting before starting, and FIG. 2B is a schematic diagram of the casting according to an embodiment of the present invention. Schematic diagram of the drawing.

In order to prevent the molten metal 106 to be cast from leaking out of the gap between the bottom mold 102 and the side mold 104, and preventing the cooling water 114 from rushing into the gap 202 between the bottom mold 102 and the metal shell 200 thereon, the present embodiment first A mold-fit patch 108 is provided and the mold-fit patch 108 is placed on the continuous casting apparatus 100. The mold-fit patch 108 is a flexible refractory cloth or refractory blanket, wherein the mold-fit patch 108 contains a refractory material that can perform the same function. For example, the mold-fit patch 108 generally employs a refractory cloth that is resistant to temperatures above about 600 °C.

In the present embodiment, the mold clamping patch 108 includes a first portion 110 having a leakage preventing function and a second portion 112 having a blocking function. Wherein, the first portion 110 of the mold clamping patch 108 can be used to prevent the molten metal initially filled into the cavity from leaking from the gap between the bottom mold 102 and the side mold 104, and the second portion 112 can be used to block the cooling water 114 from entering. A gap 202 between the bottom mold 102 and the metal sheath 200.

In the mold set patch 108, the first portion 110 has a first end 116 and a second end 118 opposite each other, and the second portion 112 has a first end 120 and a second end 122 opposite each other. As shown in FIG. 2A, in some examples, the mold-fit patch 108 is integrally formed, that is, the first part of the mold-fit patch 108. The sub-division 110 is directly joined to the second portion 112 and is formed into a first portion 110 and a second portion 112 by folding the mold-fit patch 108 or directly forming the molding. In some particular examples, the first portion 110 and the second portion 112 of the mold patch 108 can also be two separate portions from each other. In some examples, the first portion 110 and the second portion 112 of the mold-fit patch 108 are of the same material, such as a mold-fit patch. However, in other examples, the first portion 110 and the second portion 112 of the mold-fit patch 108 may be of different materials as long as they have the same function.

In the improved method of the present embodiment, the first portion 110 of the mold-bonding patch 108 is attached to the inner side surface 124 of the side mold 104 of the continuous casting apparatus 100 and the upper surface 126 of the bottom mold 102; the second portion 112 is extended. It is attached to the outer side 128 of the bottom mold 102 as shown in Fig. 2A.

Since the first portion 110 of the mold-fit patch 108 extends from the inner side 124 of the side mold 104 to the upper surface 126 of the bottom mold 102 via the seam between the side mold 104 and the bottom mold 102, the first portion 110 can cover the side The seam between the die 104 and the bottom mold 102 prevents the initial leakage of molten metal from the seam between the side mold 104 and the bottom mold 102. The materials used for bonding are generally high temperature resistant greases.

The second portion 112 of the mold-fit patch 108 fits over the inner side 124 of the side mold 104 and the outer side 128 of the bottom mold 102. In some examples, the second portion 112 can even extend to the bottom surface 130 of the bottom mold 102. , as shown in Figure 2A.

Therefore, the second portion 112 of the mold-fit patch 108 can be disposed to cover the joint between the bottom mold 102 and the shell to form a stable water curtain. It is ensured that the cooling water 114 does not rush into the gap 202 between the bottom mold 102 and the metal shell 200 during the casting process, and the gap 202 is narrowed, that is, the amount of deformation can be effectively reduced, thereby improving the quality of the head end.

In the present embodiment, the order in which the first portion 110 and the second portion 112 of the mold clamping patch 108 are attached can be adjusted according to operational requirements. For example, the second portion 112 of the mold-bonding patch 108 can be extended to the inner side surface 124 of the side mold 104 and the outer side surface 128 of the bottom mold 102, and the first portion 110 can be extended to the inner side of the side mold 104. 124 (or second portion 112) is on top surface 126 of bottom mold 102. However, the first portion 110 of the mold patch patch 108 may be attached first and then the second portion 112 may be attached.

It is obvious from the above embodiments that the embodiment of the present invention is to use a mold clamping patch 108 which is originally used to prevent leakage of molten metal from between the bottom mold and the side mold, and is modified by a slight modification. It can combine both the leak stop and the good water retaining effect, and at the same time has the effect of reducing the gap 202, that is, the deformation amount of the metal shell 200 can be effectively reduced. Therefore, by using this method, the quality of the head end of the metal embryo can be effectively improved without additional cost and equipment investment.

While the present invention has been described above by way of example, it is not intended to be construed as a limitation of the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Continuous casting equipment

102‧‧‧Bottom mode

104‧‧‧ side mode

106‧‧‧metal liquid

108‧‧‧Molding patch

110‧‧‧Part 1

112‧‧‧Part II

114‧‧‧Cooling water

116‧‧‧ first end

118‧‧‧ second end

120‧‧‧ first end

122‧‧‧ second end

124‧‧‧ inside

126‧‧‧ upper surface

128‧‧‧Outside

130‧‧‧ bottom

200‧‧‧Metal shell

202‧‧‧ gap

Claims (2)

A method for improving the quality of a head end of a metal blank produced by continuous casting, comprising: providing a mold-fit patch, wherein the mold-fit patch comprises a first portion having a leak-proof function and a second portion having a function of blocking cooling water; The first portion extends to fit an inner side surface of one of the side molds of one of the continuous casting apparatuses and an upper surface of one of the bottom molds of the continuous casting apparatus; and the second part is extended to be attached to an outer side surface of the bottom mold. A method for improving the quality of the head end of a metal blank produced by continuous casting, as in claim 1, wherein the mold-bonding patch is a flexible refractory cloth or a refractory blanket.