Internal structure control method for copper alloy large-specification slab ingot

Abstract

The invention discloses a copper alloy large-specification slab ingot internal structure control method which comprises the following steps: S1, according to the width and thickness size of a crystallizer, five first water inlets are formed in each of two width surfaces of the crystallizer, and one second water inlet is formed in each of two thickness surfaces of the crystallizer; s2, valves are mounted on the first water inlet and the second water inlet; s3, a flow divider is installed on the crystallizer, and four flow injection holes are formed in the bottom of the flow divider; s4, in the casting process, the flow of the copper alloy melt entering the flow divider is controlled, and it is guaranteed that the flow of four flow injection holes of the flow divider is consistent and uniform, and flow is not interrupted; and S5, after the copper alloy melt enters the crystallizer, under cooling of cooling water, the copper alloy melt is solidified in the direction from the inner wall of the crystallizer to the flow injection hole, and under downward traction of a casting machine, the copper alloy large-specification slab ingot is produced. The method can effectively solve the quality problems of surface cracking and orange peel of the rolled plate strip due to coarse grains of the internal structure of the copper alloy large-specification slab ingot and excessive growth of columnar crystals.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting and processing, and in particular to a method for controlling the internal structure of a large-sized copper alloy flat ingot. Background Art

[0002] Large-sized copper alloy flat ingots are mainly used for the rolling production of copper alloy plates and strips. Due to the uneven cooling during the casting process and the uneven heat distribution in the crystallizer, the internal structure of the large-sized flat ingots is coarse and the columnar crystals are overgrown. In the subsequent rolling production, quality defects such as cracks and orange peel on the surface of the plate and strip appear, and a large amount of waste is generated during the processing process, resulting in a low yield of the plate and strip, which increases production costs and labor intensity. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a method for controlling the internal structure of a large-sized copper alloy flat ingot.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows: A method for controlling the internal structure of a large-sized copper alloy flat ingot comprises the following steps: S1. According to the width and thickness of the crystallizer, five first water inlets are respectively arranged on the two width surfaces of the crystallizer, and one second water inlet is respectively arranged on the two thickness surfaces of the crystallizer, wherein the five first water inlets on one width surface and the one second water inlet on the thickness surface are respectively connected to the first water inlet pipe, and the five first water inlets on the other width surface and the one second water inlet on the thickness surface are respectively connected to the second water inlet pipe; S2, valves are installed on the first water inlet and the second water inlet. During the casting process, the valve opening is adjusted according to the cooling condition of the ingot to control the cooling water flow; S3. A flow divider is installed on the crystallizer, and four injection holes are set at the bottom of the flow divider. After the copper alloy melt enters the flow divider, the copper alloy melt is injected into the crystallizer from the four injection holes. The copper alloy melt entering the crystallizer is evenly distributed at equal distances in the width direction of the crystallizer and is located in the center of the thickness direction of the crystallizer; S4. During the casting process, the flow rate of the copper alloy melt entering the diverter is controlled to ensure that the flow rates of the four injection holes of the diverter are consistent, uniform, and continuous; S5. After the copper alloy melt enters the crystallizer, it solidifies from the inner wall of the crystallizer toward the injection hole under the cooling of cooling water, and is pulled downward by the casting machine to produce large-sized copper alloy flat ingots.

[0005] The crystallizer is made of pure copper with good thermal conductivity, the inner wall of the crystallizer is chrome-plated and the inside is smooth.

[0006] Wherein, in step S1, the distance between adjacent first water inlets is 133 mm, and the distance between the second water inlet and the inner wall of the crystallizer is 100 mm.

[0007] The spacing between the four injection holes is 160 mm, the distance between the injection holes and the inner wall of the crystallizer is 160 mm, the copper alloy melt entering the crystallizer is evenly distributed at equal distances in the width direction of the crystallizer, and the injection holes are located in the center of the crystallizer in the thickness direction.

[0008] The beneficial effects of the present invention are: 1. The crystallizer of the present invention is made of pure copper, which has good thermal conductivity and is conducive to the rapid cooling and forming of large-sized copper alloy flat ingots. The inner wall of the crystallizer is chrome-plated, which is conducive to the surface quality control of the copper alloy ingot.

[0009] 2. The present invention evenly arranges water inlets in the width and thickness directions of the crystallizer, sets valves at the water inlets, and controls the cooling water flow rate, so that the width and thickness of the copper alloy ingot are evenly cooled, which is beneficial to the rapid nucleation of the grain structure inside the ingot.

[0010] 3. The present invention injects the copper alloy melt into the crystallizer from four injection holes by setting a flow divider, thereby reducing the temperature difference between the inner wall of the crystallizer and the injection point as much as possible, and promoting the rapid formation of the fine grain area on the surface of the large-sized copper alloy flat ingot. At the same time, due to the increase in the injection points of the crystallizer, the temperature difference in the crystallizer is significantly reduced, and the growth of the columnar crystals of the ingot is effectively controlled. The internal structure of the large-sized flat ingot is transformed from the surface fine grain area, long columnar crystals and equiaxed crystals to the surface fine grain area, fine columnar crystals and equiaxed crystals from the outside to the inside.

[0011] 4. The present invention can effectively solve the quality problems of coarse grains and excessive growth of columnar crystals in the internal structure of large-sized copper alloy flat ingots, which lead to cracks and orange peel on the surface of rolled plates and strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0014] like Figure 1 As shown, a method for controlling the internal structure of a large-sized copper alloy flat ingot comprises the following steps: S1. According to the width and thickness dimensions of the crystallizer 6, the width is 800 mm and the thickness is 200 mm. Five first water inlets 2 are evenly distributed on the two width surfaces of the crystallizer 6, and one second water inlet 5 is arranged on the two thickness surfaces of the crystallizer 6. The second water inlet 5 is located at the center of the thickness surface. The five first water inlets 2 on one width surface and the one second water inlet 5 on the thickness surface are respectively connected to the first water inlet pipe 1, and the five first water inlets 2 on the other width surface and the one second water inlet 5 on the thickness surface are respectively connected to the second water inlet pipe 4; Valves are installed on S2, the first water inlet 2 and the second water inlet 5. During the casting process, the valve opening is adjusted according to the cooling condition of the ingot to control the cooling water flow; S3, a flow divider 7 is installed on the crystallizer 6, and four injection holes 3 are set at the bottom of the flow divider 7. After the copper alloy melt enters the flow divider 7, the copper alloy melt is injected into the crystallizer 6 from the four injection holes 3. The copper alloy melt entering the crystallizer 6 is evenly distributed at equal distances in the width direction of the crystallizer 6 and is located at the center of the crystallizer 6 in the thickness direction; S4, during the casting process, the flow rate of the copper alloy melt entering the diverter 7 is controlled to ensure that the flow rates of the 4 injection holes 3 of the diverter 7 are consistent, uniform, and continuous; S5. After the copper alloy melt enters the crystallizer 6, it solidifies from the inner wall of the crystallizer 6 toward the injection hole 3 under the cooling of cooling water, and is pulled downward by the casting machine to produce a large-sized copper alloy flat ingot.

[0015] The crystallizer 6 is made of pure copper with good thermal conductivity. The inner wall of the crystallizer 6 is chrome-plated and the inside is smooth.

[0016] Wherein, in step S1, the distance between adjacent first water inlets 2 is 133 mm, and the distance between the second water inlet 5 and the inner wall of the crystallizer 6 is 100 mm.

[0017] Among them, the spacing between the four injection holes 3 is 160 mm, the distance between the injection hole 3 and the inner wall of the crystallizer 6 is 160 mm, the copper alloy melt entering the crystallizer 6 is evenly distributed at equal distances in the width direction of the crystallizer 6, and the injection hole 3 is located in the center of the crystallizer 6 in the thickness direction.

[0018] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A method for controlling the internal structure of a large-sized copper alloy flat ingot, characterized in that: The following steps are involved: S1. According to the width and thickness of the crystallizer (6), five first water inlets (2) are respectively arranged on the two width surfaces of the crystallizer (6), and one second water inlet (5) is respectively arranged on the two thickness surfaces of the crystallizer (6), wherein the five first water inlets (2) on one width surface and the one second water inlet (5) on the thickness surface are respectively connected to the first water inlet pipe (1), and the five first water inlets (2) on the other width surface and the one second water inlet (5) on the thickness surface are respectively connected to the second water inlet pipe (4); S2, valves are installed on the first water inlet (2) and the second water inlet (5). During the casting process, the valve opening is adjusted according to the cooling condition of the ingot to control the cooling water flow; S3, a flow divider (7) is installed on the crystallizer (6), and four injection holes (3) are arranged at the bottom of the flow divider (7). After the copper alloy melt enters the flow divider (7), the copper alloy melt is injected into the crystallizer (6) from the four injection holes (3). The copper alloy melt entering the crystallizer (6) is evenly distributed at equal distances in the width direction of the crystallizer (6) and is located at the center of the thickness direction of the crystallizer (6); S4, during the casting process, controlling the flow rate of the copper alloy melt entering the diverter (7) to ensure that the flow rates of the four injection holes (3) of the diverter (7) are consistent, uniform, and continuous; S5. After the copper alloy melt enters the crystallizer (6), it solidifies from the inner wall of the crystallizer (6) toward the injection hole (3) under the cooling of cooling water, and is pulled downward by the casting machine to produce a large-sized copper alloy flat ingot.

2. The method for controlling the internal structure of a large-sized copper alloy flat ingot according to claim 1, characterized in that: The crystallizer (6) is made of pure copper and has good thermal conductivity. The inner wall of the crystallizer (6) is chrome-plated and has a smooth interior.

3. The method for controlling the internal structure of a large-sized copper alloy flat ingot according to claim 1, characterized in that: In step S1, the distance between adjacent first water inlets (2) is 133 mm, and the distance between the second water inlet (5) and the inner wall of the crystallizer (6) is 100 mm.

4. The method for controlling the internal structure of a large-sized copper alloy flat ingot according to claim 1, characterized in that: The four injection holes (3) are spaced 160 mm apart, the injection holes (3) are 160 mm away from the inner wall of the crystallizer (6), the copper alloy melt entering the crystallizer (6) is evenly distributed at equal distances in the width direction of the crystallizer (6), and the injection hole (3) is located at the center of the crystallizer (6) in the thickness direction.

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