CN118543655A - A copper-aluminum composite material continuous casting and rolling composite production line and its manufacturing process - Google Patents

Abstract

The invention relates to the technical field of copper-aluminum composite materials, and discloses a copper-aluminum composite material continuous casting and rolling composite production line, which comprises a copper strip uncoiler, an aluminum melting furnace, a casting and rolling machine, a hot rolling machine and a rolling machine which are sequentially arranged; the continuous casting and rolling composite manufacturing process of the copper-aluminum composite material comprises the steps of heating an aluminum raw material in an aluminum melting furnace to melt the aluminum raw material into aluminum liquid; unreeling the copper strip, and then introducing the copper strip into a cleaning device to remove surface oxides and pollutants; the copper strip is connected to a roller of a casting machine, aluminum liquid is injected onto the copper strip on the roller through a sprue gate of the casting nozzle, a cooling system is arranged in the roller, the aluminum liquid is solidified and cast-rolled in the casting machine to be compounded on the surface of the copper strip, and a copper-aluminum primary composite material is obtained; the copper-aluminum preliminary composite material is connected into a plurality of hot rolls for hot rolling forming to obtain a target copper-aluminum composite material; and (3) winding the prepared target copper-aluminum composite material in a winding machine. The invention realizes continuous casting and rolling, has high production efficiency, simple process flow and energy consumption saving.

Description

A copper-aluminum composite material continuous casting and rolling composite production line and its manufacturing process

Technical Field

The invention relates to the technical field of copper-aluminum composite materials, and in particular to a copper-aluminum composite material continuous casting and rolling composite production line and a manufacturing process thereof.

Background Art

One side of the copper-aluminum composite strip is copper and the other side is aluminum. Copper and aluminum form a physical bond between molecules and are used as conductive materials. For example, new energy battery electrodes require long copper-aluminum composite strips as raw materials; copper-aluminum joints, electrical equipment, electronic bars, electronic strips, etc. all require copper-aluminum composite strips as raw materials. Therefore, copper-aluminum composite strips are a functional material with a wide range of applications.

Since copper and aluminum will form a powder phase under a temperature environment above 500℃ and the two cannot bond, the composite of copper and aluminum can only be pressed and physically bonded at a temperature below 500℃. When the temperature of copper rises above 80℃, copper will oxidize on the surface, making it impossible for copper to bond with aluminum. Therefore, the actual composite of copper and aluminum is cold rolled or cold drawn at room temperature. Because the cold processing composite of copper and aluminum must have a large processing volume, the theoretical combined processing volume is above 81%, and the actual combined processing volume is at least above 90%, in order to combine copper and aluminum together. At present, the mainstream copper-aluminum composite strip processing and production uses square copper and aluminum ingots, adopts large processing deformation, cold-rolled composite into plates, and then cuts the copper-aluminum composite plates into copper-aluminum composite strips. When cold-processing to make copper-aluminum strips, thick copper and aluminum bars need to be rolled, but thick copper and aluminum bars cannot be rolled into strips. Only straight copper and aluminum bars can be used, and the length will not exceed 12 meters. It cannot form a long length, the efficiency is low, and the copper-aluminum composite strip cannot be continuously extruded and produced.

In addition, the patent number 201811307901.X, a method for preparing a high-performance ultrafine-grained copper/aluminum/copper composite strip by continuous hot rolling-deep cold rolling, discloses a process for preparing copper-aluminum composite plates by continuous hot rolling-cold rolling, which still requires the use of a cold rolling process. Its step "the third step is to cool to room temperature", which means that the process cannot achieve true continuous and uninterrupted production. The product after the initial hot rolling needs to be cooled to room temperature and then cryogenically treated to -190 to -100 ° C, which makes continuous production impossible. It can also be confirmed that the patent name was changed to "a method for preparing a high-performance ultrafine-grained copper/aluminum/copper composite strip" in its authorization text.

Therefore, the existing copper-aluminum composite strip processing technology has problems such as long process flow, low yield rate, high cost, and inability to achieve continuous production, which need to be improved.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides a copper-aluminum composite material continuous casting and rolling composite production line and a manufacturing process thereof to achieve continuous casting and rolling.

The present invention provides the following technical solution: a copper-aluminum composite material continuous casting and rolling composite production line, comprising a copper strip uncoiler, an aluminum melting furnace, a casting and rolling mill, a hot rolling mill and a winding machine which are arranged in sequence, the copper strip is connected to the casting roller of the casting and rolling mill after passing through the copper strip uncoiler, the aluminum liquid of the aluminum melting furnace is connected to the casting nozzle of the casting and rolling mill, a cleaning device for removing oxides and pollutants on the surface of the copper strip is arranged between the casting and rolling mill and the copper strip uncoiler, the diameter of the casting and rolling mill roll is 500-1300mm, and the roll surface width of the casting and rolling mill roll is 500-1300mm.

A continuous casting and composite production process of copper-aluminum composite materials, using the above production line to produce copper-aluminum composite materials, the steps are as follows:

S1: heating the aluminum raw material in the aluminum melting furnace to melt it into aluminum liquid;

S2: After unwinding the copper strip, place it in a cleaning device to remove surface oxides and contaminants;

S3: Connect the copper strip to the roll of the casting mill, and inject the aluminum liquid into the roll through the nozzle of the casting nozzle. The roll is provided with a cooling system. The aluminum liquid solidifies and is cast and rolled on the surface of the clean copper strip in the casting mill to obtain a preliminary copper-aluminum composite material.

S4: The preliminary copper-aluminum composite material is connected to a plurality of hot rolling rollers for hot rolling to obtain the target copper-aluminum composite material;

S5: The obtained target copper-aluminum composite material is connected to a winder for winding.

Furthermore, in the step S1, the heating temperature is 690-780°C.

Furthermore, in step S3, the aluminum liquid is cooled to 380-420° C. for crystallization.

Furthermore, in step S3, the aluminum liquid and the copper strip are compounded under the protection of an inert gas.

Furthermore, in step S3, the pressure of the casting roll is controlled to be above 1200 tons.

Furthermore, in step S5, the target copper surface width of the copper-aluminum composite material is 100-1200 mm.

Furthermore, in the step S5, the target copper-aluminum composite material has a thickness tolerance within 6 _μm .

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention is a continuous casting and rolling process, which uses liquid aluminum and solid copper to be initially cast and rolled in a casting and rolling machine, and then undergoes multiple hot rolling procedures to finally form the product. The process is continuous and can be produced continuously, greatly improving production efficiency.

2. The present invention uses liquid aluminum and solid copper. Before the copper strip contacts the aluminum liquid, the copper strip is at room temperature. It does not need to be heated additionally, and the copper strip itself is prevented from being oxidized at high temperature. After the copper strip and the aluminum liquid enter the casting and rolling mill, they are protected by inert gas, usually nitrogen or argon. The contact surface between the copper strip and the aluminum liquid will not be oxidized, thus ensuring the copper-aluminum composite strength and product quality.

3. Continuous hot rolling uses the waste heat after the aluminum liquid and the copper strip are combined to achieve hot rolling. There is no need to heat the copper-aluminum composite material again to complete the hot rolling process. Not only is the process simple, but it also saves energy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of the present invention.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1:

The present invention refers to a copper-aluminum composite material continuous casting and rolling composite production line, which includes a copper strip unwinder 1, an aluminum melting furnace 2, a casting and rolling mill 3, a hot rolling mill 4 and a winder 5 arranged in sequence. The copper strip is connected to the casting roller of the casting and rolling mill after passing through a copper strip pay-off frame, and the aluminum liquid in the aluminum melting furnace is connected to the casting nozzle of the casting and rolling mill. A cleaning device 6 for removing oxides and pollutants on the surface of the copper strip is provided between the casting and rolling mill and the copper strip pay-off frame.

According to the needs of the product, a single copper strip uncoiler is needed to produce single-layer aluminum composite single-layer copper. If a double-layer copper sandwich single-layer aluminum is produced, two copper strip uncoilers are set up. The two copper strips are respectively pressed against the upper and lower rollers of the casting and rolling mill. The molten aluminum is injected into the space between the two copper strips through the nozzle of the casting and rolling mill and is initially compounded through casting and rolling by the casting rollers of the casting and rolling mill.

Embodiment 2:

Using the production line in Example 1, the process for producing the copper-aluminum composite material is as follows:

S1: The aluminum raw material is heated in the aluminum melting furnace to melt it into aluminum liquid at a temperature of about 750 degrees. The temperature is generally measured to be between 690-780 degrees.

S2: After unwinding the copper strip, place it in a cleaning device to remove surface oxides and contaminants;

S3: The copper strip is connected to the roll of the casting and rolling mill, and the aluminum liquid is injected into the copper strip on the roll through the nozzle of the casting nozzle. The roll is provided with a cooling system. The aluminum liquid solidifies and is cast and rolled on the surface of the copper strip in the casting and rolling mill to obtain a preliminary copper-aluminum composite material. During this casting and rolling process, the aluminum liquid is cooled from about 750°C to 380-420°C for crystallization.

S4: The preliminary copper-aluminum composite material is connected to a plurality of hot rolling rollers for hot rolling to obtain a target copper-aluminum composite material; according to the target product specification requirements, a plurality of hot rolling mills are set for hot rolling to obtain a final product.

S5: The obtained target copper-aluminum composite material is connected to a winder for winding.

The aluminum raw material in the aluminum melting furnace can be pure aluminum or aluminum alloy. The raw materials can be added continuously or intermittently according to the production rate to ensure that the aluminum melting furnace continuously pours aluminum liquid into the composite mold; the material of the copper strip can be pure copper or copper alloy. The passivated copper material must be cleaned to remove surface oxides and contaminants before entering the composite mold. If oxygen-free copper is selected, the use of this oxygen-free copper generally occurs when the company produces copper strips or there is an upstream copper strip supplier near the company that directly supplies it, which can save the cleaning process and further simplify the production process.

After testing, the copper-aluminum composite material produced using our company's production process has increased production efficiency by 2 times, and the composite strength of the copper-aluminum composite material is high. The parameters are as follows: peel strength ≥ 260N/mm, exceeding the industry standard.

Claims (9)

1. A continuous casting and rolling composite production line for copper-aluminum composite materials, characterized in that it comprises a copper strip uncoiler, an aluminum melting furnace, a casting and rolling mill, a hot rolling mill and a coiler arranged in sequence, the copper strip is connected to the casting roll of the casting and rolling mill after passing through the copper strip uncoiler, and the casting nozzle of the aluminum liquid casting and rolling mill of the aluminum melting furnace, and the obtained copper-aluminum composite material is connected to the coiler after being hot-rolled by multiple hot rolling rollers. 2. A continuous casting and rolling composite production process for copper-aluminum composite materials, characterized in that: the copper-aluminum composite materials are produced using the production line described in claim 1, and the steps are as follows: S1: heating the aluminum raw material in the aluminum melting furnace to melt it into aluminum liquid; S2: After unwinding the copper strip, place it in a cleaning device to remove surface oxides and contaminants; S3: Connect the copper strip to the roll of the casting and rolling mill, and inject the aluminum liquid into the copper strip on the roll through the nozzle of the casting nozzle. The roll is provided with a cooling system. The aluminum liquid solidifies and is cast and rolled on the surface of the copper strip in the casting and rolling mill to obtain a preliminary copper-aluminum composite material. S4: The preliminary copper-aluminum composite material is connected to a plurality of hot rolling rollers for hot rolling to obtain the target copper-aluminum composite material; S5: The obtained target copper-aluminum composite material is connected to a winder for winding. 3. The continuous casting and rolling composite production line of copper-aluminum composite materials according to claim 1 is characterized in that the diameter of the roll of the casting and rolling mill is 500-1300 mm, and the width of the roll surface is 500-1300 mm. 4. A continuous casting and rolling composite manufacturing process for copper-aluminum composite materials according to claim 2, characterized in that: in the step S1, the heating temperature is 690-780°C. 5. A continuous casting and rolling composite manufacturing process for a copper-aluminum composite material according to claim 2, characterized in that: in the step S3, the aluminum liquid is cooled to 300-420°C for crystallization. 6. A continuous casting and rolling composite manufacturing process for a copper-aluminum composite material according to claim 2, characterized in that: in said step S3, the aluminum liquid and the copper strip are under the protection of an inert gas when being composited. 7. A continuous casting and rolling composite manufacturing process for copper-aluminum composite materials according to claim 2, characterized in that: the pressure of the casting roll in step S3 is controlled to be above 1200 tons. 8. A copper-aluminum composite material continuous casting and rolling composite manufacturing process according to claim 2, characterized in that: the copper surface width of the target copper-aluminum composite material in step S5 is 100-1200mm. 9. The continuous casting and rolling composite manufacturing process of a copper-aluminum composite material according to claim 2, characterized in that: the thickness tolerance of the target copper-aluminum composite material in step S5 is within 6 _μm .