Manufacturing process of a copper-aluminum composite strip with a groove structure

Abstract

The present invention provides a manufacturing process for a copper-aluminum composite strip with a groove structure, which relates to the field of copper-aluminum composite materials. This manufacturing process includes the following steps: S1: Prepare a special-shaped copper strip; when observed from the cross-sectional direction, the upper plate surface of the special-shaped copper strip is a convex arc surface, the lower plate surface is a flat surface or a concave arc surface, and the width of the upper plate surface is greater than that of the lower plate surface; at least one groove is provided on the lower plate surface, the bottom surface of the groove is a concave arc surface, and at least one of the two groove side surfaces inclines outwards; S2: Place the lower plate surface with the groove of the special-shaped copper strip on the aluminum liquid, and make the special-shaped copper strip enter the roll gap along the length direction of the groove and carry out casting and rolling composite with the aluminum liquid; after the casting and rolling composite, ensure that both groove side surfaces incline outwards; S3: Cold rolling and annealing; S4: Forming processing. The present invention can make the bottom angle and top angle of the groove be obtuse angles after casting and rolling, reduce the stress generated in the corner area during the solidification of the aluminum liquid, and effectively improve the anti-peeling performance of the copper-aluminum composite strip.

Description

Technical Field

[0001] The present invention specifically relates to a manufacturing process of a copper-aluminum composite strip with a groove structure, and belongs to the field of copper-aluminum composite materials. Background Art

[0002] Copper-aluminum composite materials combine the respective advantages of copper and aluminum materials, and have characteristics such as high electrical conductivity, high thermal conductivity, light weight, corrosion resistance, and low comprehensive cost. They are widely used in fields such as electricity, semiconductors, electronic devices, and new energy vehicles.

[0003] There are various copper-aluminum composite materials, and it is necessary to process copper-aluminum composite materials with different shapes and structures according to customer requirements, such as a copper-aluminum composite strip with a groove structure. Referring to the attached Figure 1 , there is a certain copper-aluminum composite strip with a groove structure. This copper-aluminum composite strip uses a copper strip with a groove structure as the base material, and a layer of aluminum material is compounded on the copper strip by a copper-aluminum solid-liquid composite process. The copper-aluminum solid-liquid composite process is a composite process in which a copper strip is covered on semi-molten aluminum liquid for casting and rolling. Compared with the mechanical press-fitting process, the copper-aluminum solid-liquid composite process has advantages such as higher interfacial bonding strength, lower production cost, and suitability for continuous production.

[0004] Referring to the attached Figure 2 , setting the groove structure can increase the contact area and heat dissipation of copper and aluminum. However, it is found in actual tests that there are defects at the four corner parts of the groove structure of this copper-aluminum composite strip. Among them, the defect at the corner part of point A is the largest, and the defect at the corner part of point B is smaller than that at the corner part of point A. After applying a test force, peeling first appears at the corner part of point A of the groove structure. Moreover, it is found in further tests that the smaller the corner, the larger the defect, and the easier it is to have copper-aluminum peeling. Summary of the Invention

[0005] In order to overcome the deficiencies in the background art, the present invention discloses a manufacturing process of a copper-aluminum composite strip with a groove structure, and its purpose is to solve the problem that there are defects at the groove part in the prior art and copper-aluminum peeling is likely to occur.

[0006] The present invention adopts the following technical solutions:

[0007] Technical Solution 1: A manufacturing process of a copper-aluminum composite strip with a groove structure, including the following steps:

[0008] S1: Prepare a special-shaped copper strip; when observed from the cross-sectional direction, the upper plate surface of this special-shaped copper strip is a convex arc surface, the lower plate surface is a flat surface or a concave arc surface, and the width of the upper plate surface is greater than that of the lower plate surface; at least one groove is provided on the lower plate surface, the bottom surface of the groove is a concave arc surface, and at least one of the two groove side surfaces is inclined outward;

[0009] S2: Place the lower plate surface of the special-shaped copper strip with the groove on the aluminum liquid, and make the special-shaped copper strip tilt into the roll gap along the length direction of the groove to carry out casting and rolling composite with the aluminum liquid; after casting and rolling composite, ensure that both groove side surfaces are tilted outwards;

[0010] S3: Cold rolling and annealing;

[0011] S4: Forming process.

[0012] The present invention uses a special-shaped copper strip, and its beneficial effects are as follows:

[0013] 1. The disadvantage of copper-aluminum casting and rolling composite is that stress will be generated in the corner area after the aluminum liquid solidifies, especially at the acute or right-angle parts. The smaller the angle, the greater the stress. In the present invention, after casting and rolling, both the bottom angle and the top angle of the groove can become obtuse angles, reducing the stress generated in the corner area when the aluminum liquid solidifies, and effectively improving the anti-peeling performance of the copper-aluminum composite strip.

[0014] 2. The obtuse angle structure increases the contact area between the aluminum liquid and the groove side surface, which is beneficial to improving the bonding strength and conductivity of copper-aluminum composite.

[0015] 3. The upper plate surface is a convex arc surface, making the thickness of the middle part of the special-shaped copper strip greater than that of both sides. When carrying out casting and rolling composite with the aluminum liquid, the casting and rolling roll can generate a greater rolling force at the groove part, which is beneficial to improving the composite strength of the aluminum liquid at the groove part.

[0016] 4. The special-shaped copper strip enters the roll gap along the length direction of the groove to carry out casting and rolling composite with the aluminum liquid, so that the rolling deformation part of the special-shaped copper strip first appears at the part with a higher convex arc surface, and then extends to both sides, which is beneficial to improving the composite strength of the lower plate surface, the groove and the aluminum liquid.

[0017] 5. The special-shaped copper strip tilts into the roll gap along the length direction of the groove, which is beneficial to completely discharging the air between the special-shaped copper strip and the aluminum liquid, and improving the bonding strength and conductivity of copper-aluminum composite.

[0018] Improved technical solution 2 based on technical solution 1: The width of the upper plate surface is greater than the width of the lower plate surface.

[0019] After implementing technical solution 2, the beneficial effect generated is: The width of the upper plate surface is greater than the width of the lower plate surface, which can form an obtuse angle between the lower plate surface and the side plate surface, and an acute angle between the upper plate surface and the side plate surface, so as to transfer the stress weak point from the obtuse angle to the acute angle, and ensure the composite strength of the bottom of the groove and the aluminum liquid.

[0020] Improved technical solution 3 based on technical solution 1 or 2: In S1, a fillet is provided between the lower plate surface and the side plate surface.

[0021] After implementing Technical Solution 3, the beneficial effects are as follows: Compared with obtuse angles, smaller stresses will be generated after the aluminum liquid solidifies at the rounded corner parts.

[0022] Improved Technical Solution 4 based on Technical Solution 2: The included angle between the lower plate surface and the side plate surface is 110 - 150°.

[0023] After implementing Technical Solution 4, the beneficial effects are as follows: The larger the sharp angle, the smaller the stress, but an excessive included angle will cause waste of materials. The included angle of 110 - 150° combines the composite strength and economy of the copper-aluminum composite strip.

[0024] Improved Technical Solution 5 based on Technical Solution 1: In S1, a profiled copper strip is prepared by a continuous extrusion or rolling process.

[0025] After implementing Technical Solution 5, the beneficial effects are as follows: A profiled copper strip can be efficiently prepared by either a continuous extrusion process or a profiled roll rolling process.

[0026] Improved Technical Solution 6 based on Technical Solution 1: In S2, before casting and rolling for composite, the profiled copper strip is cleaned and shot peened.

[0027] After implementing Technical Solution 6, the beneficial effects are as follows: Cleaning can remove the oxide film, grease, and impurities on the surface of the profiled copper strip, which is beneficial to improving the wettability and composite strength between the profiled copper strip and the aluminum liquid. Shot peening can form tiny uneven surfaces on the surface of the profiled copper strip, which is beneficial to increasing the composite area between the profiled copper strip and the aluminum liquid.

[0028] Improved Technical Solution 7 based on Technical Solution 1: In S4, the forming process includes milling, slitting, and grinding.

[0029] After implementing Technical Solution 7, the beneficial effects are as follows: Copper-aluminum composite strips for different uses have different forming requirements, and milling, slitting, and grinding can meet the usage requirements of different copper-aluminum composite strips.

[0030] Improved Technical Solution 8 based on Technical Solution 7: In S4, during milling, first mill the copper-covered surface with the aluminum-covered surface of the copper-aluminum composite strip as the reference to ensure the distance from the bottom surface of the embedded groove to the copper-covered surface, and then mill the aluminum-covered surface with the copper-covered surface as the reference to ensure the final thickness of the copper-aluminum composite strip.

[0031] After implementing Technical Solution 8, the beneficial effects are as follows: This milling process can ensure the dimensional requirements of the copper-aluminum composite strip. Description of the Drawings

[0032] Attached Figure 1 shows a schematic diagram of the overall structure of the copper-aluminum composite strip.

[0033] Attached Figure 2 shows the attachedFigure 1 Schematic diagram of the local structure

[0034] Attached Figure 3 shows a schematic diagram of the special-shaped copper strip in Embodiment 1

[0035] Attached Figure 4 shows a schematic diagram of copper-aluminum continuous casting and rolling composite

[0036] Attached Figure 5 shows a front view of the special-shaped copper strip when entering the rolling gap

[0037] Attached Figure 6 shows a side view of the special-shaped copper strip when entering the rolling gap

[0038] Attached Figure 7 shows a schematic diagram of the structure of the copper-aluminum composite strip after continuous casting and rolling composite

[0039] Attached Figure 8 shows a schematic diagram of milling the edges of the copper-aluminum composite strip

[0040] Attached Figure 9 shows a schematic diagram of the special-shaped copper strip in Embodiment 2

[0041] Attached Figure 10 shows a schematic diagram of the structure of the copper-aluminum composite strip after continuous casting and rolling composite in Embodiment 2

[0042] Attached Figure 11 shows a schematic diagram of the structure of a high-voltage connector in Embodiment 3

[0043] Attached Figure 12 shows a schematic diagram of the special-shaped copper strip in Embodiment 3

[0044] Attached Figure 13 shows a schematic diagram of the structure of the copper-aluminum composite strip after continuous casting and rolling composite in Embodiment 3

[0045] Attached Figure 14 shows a schematic diagram of milling the surface of the copper-aluminum composite strip

[0046] Attached Figure 15 shows a schematic diagram of slitting the copper-aluminum composite strip

[0047] In the drawings: 1. Copper-aluminum composite strip; 1.1. Copper-clad surface; 1.2. Aluminum-clad surface; 1.3. Copper strip; 1.4. Aluminum insert; 2. Special-shaped copper strip; 2.1. Upper plate surface; 2.2. Lower plate surface; 2.3. Side plate surface; 2.4. Groove bottom surface; 2.5. Groove side surface; 2.6. Rounded corner; 3. Furnace; 4. Casting nozzle; 5. Aluminum liquid; 6. Casting and rolling roll Detailed implementation manners

[0048] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these preferred embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation and positional relationship. Therefore, it should not be construed as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0049] Example 1: Referring again to the attached Figure 1 . A copper-aluminum composite strip for heat dissipation of electronic devices. The copper-aluminum composite strip uses a copper strip as the base material to composite an aluminum material. The copper-clad surface is the conductive surface, and the aluminum-clad surface is the heat dissipation surface. Although the electrical conductivity and thermal conductivity of aluminum are not as good as those of copper, the heating rate of aluminum is fast and the temperature difference from the environment is larger. Under the same air volume, the heat dissipation performance of aluminum is better than that of copper. A plurality of grooves are provided on the copper strip, and their function is to increase the contact area between copper and aluminum and improve the heat dissipation performance of the copper-aluminum composite strip.

[0050] The manufacturing process of the copper-aluminum composite strip includes the following steps:

[0051] S1: Prepare a special-shaped copper strip

[0052] Referring to the attached Figure 3 . When observed from the cross-sectional direction, the upper plate surface 2.1 of the special-shaped copper strip 2 is a convex arc surface, and the lower plate surface 2.2 is a flat surface. A plurality of grooves are provided on the lower plate surface 2.2 (only five grooves are shown in the attached Figure 3 for the convenience of showing details). The groove bottom surface 2.4 of the groove is a concave arc surface. For the groove in the middle, both of its two groove side surfaces 2.5 are inclined outward; for the grooves on both sides, the groove side surface 2.5 close to the inner side is perpendicular to the lower plate surface 2.2, and the groove side surface 2.5 close to the outer side is inclined outward and forms an obtuse angle with the lower plate surface 2.2.

[0053] The preparation of profiled copper strip can adopt the continuous extrusion process or the rolling process, and both of these two processes can efficiently prepare the profiled copper strip 2. In addition, before casting-rolling compounding, the profiled copper strip 2 should be cleaned and shot peened. Pickling can remove the oxide film, grease and impurities on the surface of the profiled copper strip, which is beneficial to improving the wettability and compounding strength between the profiled copper strip and the aluminum liquid. Shot peening can form tiny uneven surfaces on the surface of the profiled copper strip, which is beneficial to increasing the compounding area between the profiled copper strip and the aluminum liquid.

[0054] S2: Casting-rolling compounding

[0055] Refer to the appendix Figure 4 The casting-rolling equipment includes a melting furnace 3, a casting nozzle 4 and a pair of casting-rolling rolls 6, and the profiled copper strip 2 is arranged on one side of the entrance of the roll gap. During casting-rolling compounding, the lower plate surface 2.2 with grooves of the profiled copper strip 2 is placed on the aluminum liquid 5, and the profiled copper strip 2 is inclined into the roll gap along the length direction of the grooves to carry out casting-rolling compounding with the aluminum liquid 5.

[0056] Refer to the appendix Figure 5 and the appendix Figure 6 The profiled copper strip 2 is inclined into the roll gap along the length direction of the grooves, which is beneficial to completely discharging the air between the profiled copper strip 2 and the aluminum liquid 5 and improving the bonding strength and conductivity of the copper-aluminum compound. Secondly, since the upper plate surface 2.1 is a convex arc surface and the groove bottom surface 2.4 of the groove is a concave arc surface, the thickness of the middle part of the profiled copper strip 2 is greater than that of both sides. When carrying out casting-rolling compounding with the aluminum liquid 5, the casting-rolling roll 6 can generate a greater rolling force at the groove part, which is beneficial to improving the compounding strength of the aluminum liquid 5 at the groove part. More importantly, the rolling of the casting-rolling roll 6 on the profiled copper strip 2 is not only the thinning in the thickness direction, but also the extension in the width direction and the length direction. The rolling deformation part first appears at the part with a higher convex arc surface (upper plate surface), and then extends to both sides (width direction).

[0057] Refer to the appendix Figure 7 the appendix Figure 7 shows the structural schematic diagram of the copper-aluminum composite strip after casting-rolling compounding. From the appendix Figure 7It can be seen that after the special-shaped copper strip 2 is rolled by the casting and rolling roll 6, the upper plate surface 2.1 is rolled from a convex arc surface into a flat surface, and the groove bottom surface 2.4 of the embedded groove is also rolled from a concave arc surface into a flat surface. Since the casting and rolling roll 6 has an extension effect on the special-shaped copper strip 2 in the width direction, for the embedded groove in the middle, the inclination angles of its two groove side surfaces 2.5 remain basically unchanged. For the embedded grooves on both sides, the groove side surface 2.5 close to the inner side inclines outward from the original vertical state, and for the groove side surface 2.5 close to the outer side, the outward inclination angle decreases. In this way, the two groove side surfaces 2.5 of all the embedded grooves are in an open state and incline outward, and both the groove bottom angle and the groove top angle are obtuse angles. It is also worth noting that since the upper plate surface 2.1 is a convex arc surface and the lower plate surface 2.2 is a flat surface, the extension length of the upper plate surface 2.1 after casting and rolling is greater than that of the lower plate surface 2.2, and an obtuse angle structure is also formed between the lower plate surface 2.2 and the side plate surface 2.3.

[0058] After the aluminum liquid solidifies, stress will be generated at the corner parts, especially at the acute angle or right angle parts. The smaller the angle, the greater the stress. The area where stress concentration exists is a weak area. Just like opening a packaging box, the film that is stretched most tightly at the edge is the easiest to tear. In the present invention, after casting and rolling, the two groove side surfaces of the embedded groove can incline outward, and both the groove bottom angle and the groove top angle are obtuse angles, effectively reducing the stress generated in the corner area of the embedded groove when the aluminum liquid solidifies.

[0059] After casting and rolling, the lower plate surface 2.2 and the side plate surface 2.3 form an obtuse angle, and the upper plate surface 2.1 and the side plate surface 2.3 form an acute angle, which is equivalent to transferring the stress weak point from the obtuse angle to the acute angle. Therefore, the defect at the corner part of point D is greater than that at the corner part of point C, and the corner part of point D is the largest defect in this area and is most prone to copper-aluminum peeling.

[0060] Refer to the appendix Figure 2 In the appendix Figure 2 The reason why the two groove side surfaces of the embedded groove in the appendix incline to one side is that the extension of the casting and rolling roll on the special-shaped copper strip in the width direction is not considered, resulting in an acute angle at the corner part of point A and an obtuse angle at the corner part of point B. After applying the load test force, peeling first appears at the corner part of point A of the embedded groove structure and then extends to other parts.

[0061] S3: Cold rolling and annealing

[0062] Cold rolling can further reduce the thickness of the copper-aluminum composite strip and improve the flatness quality. The function of annealing is to reduce the rolling stress.

[0063] S4: Forming process

[0064] Refer to the appendix Figure 8 In this embodiment, the forming process is edge milling. There are defects at the corner parts of point C and point D, and the corner part of point D is the largest weak point in this area. Therefore, the part that is most prone to copper-aluminum peeling can be milled off by edge milling.

[0065] Example 2: Refer to the appendix Figure 9 and the appendix Figure 10 . The difference between the special-shaped copper strip in this example and that in Example 1 is as follows:

[0066] 1. The width of the upper plate surface 2.1 is greater than that of the lower plate surface 2.2. An obtuse angle structure is formed between the lower plate surface 2.2 and the side plate surface 2.3, and an acute angle structure is formed between the upper plate surface 2.1 and the side plate surface 2.3. After continuous casting and rolling, the acute angle will become smaller and the obtuse angle will become larger, so as to transfer the stress weak point from the obtuse angle to the acute angle, ensuring the composite strength of the special-shaped copper strip and aluminum.

[0067] 2. The included angle between the lower plate surface 2.2 and the side plate surface 2.3 is 110 - 150°. The greater the included angle, the smaller the stress, but too large an included angle will cause waste of materials. The included angle of 110 - 150° combines the composite strength and economy of the copper-aluminum composite strip.

[0068] 3. A fillet 2.6 is provided between the lower plate surface 2.2 and the side plate surface 2.3. After setting the fillet, smaller stress will be generated after the aluminum liquid solidifies at the fillet 2.6 part.

[0069] 4. The lower plate surface 2.2 is a concave arc surface. Compared with a plane, the concave arc surface of the lower plate surface offsets the elongation of the special-shaped copper strip in the width direction by the continuous casting and rolling roll to a certain extent.

[0070] 5. For the grooves on both sides, both of the two groove side surfaces 2.5 incline inward, and the inward inclination angle of the groove side surface close to the center line is smaller than that of the groove side surface far from the center line. After continuous casting and rolling, the inward inclination angle of the groove side surface 2.5 close to the center line will become larger, and the inward inclination angle of the groove side surface 2.5 far from the center line will decrease, so as to ensure that the grooves have a better symmetrical structure after continuous casting and rolling and cold rolling.

[0071] Example 3: Refer to the appendix Figure 11 . A high-voltage connector made of a copper-aluminum composite strip, which is used for the connection of a new energy vehicle lithium battery. The high-voltage connector uses a copper strip 1.3 as a conductive base material, and a groove with a depth of 1 mm and a width of 12 mm is processed on the copper strip 1.3, and an aluminum insert 1.4 is compounded in the groove. After copper-aluminum compounding, good electrical conductivity and bonding strength are required between the aluminum insert 1.4 and the copper strip 1.3. The reason for embedding the aluminum insert 1.4 in the copper strip 1.3 is that the weldability of copper is poor and aluminum needs to be used as a welding material.

[0072] The manufacturing process of the copper-aluminum composite strip 1 includes the following steps:

[0073] S1: Prepare a special-shaped copper strip

[0074] See attached Figure 12 The special-shaped copper strip in this embodiment is different from that in Embodiment 1 in that the groove bottom surface 2.4 of the embedding groove has an inner arc surface with a larger curvature.

[0075] S2: Casting and rolling composite

[0076] See attached Figure 13 . Figure 13 It can be seen that the curvature of the inner arc surface will become smaller after casting and rolling, but the groove bottom surface 2.4 is still an arc surface, so that the groove bottom angle is larger than the groove top angle, which in disguise transfers the stress weak point from the groove bottom angle to the groove top angle.

[0077] S3: Cold rolling and annealing

[0078] S4: Forming

[0079] The difference between this embodiment and embodiment 1 is that the forming process includes milling, slitting and grinding steps.

[0080] S4.1: Milling

[0081] See attached Figure 14 First, the copper-clad surface 1.1 is milled based on the aluminum-clad surface 1.2 of the copper-aluminum composite strip 1 to ensure the distance from the groove bottom surface 2.4 to the copper-clad surface 1.1, and then the aluminum-clad surface 1.2 is milled based on the copper-clad surface 1.1 to remove the weak area at the top corner of the groove while ensuring the final thickness of the copper-aluminum composite strip 1.

[0082] S4.2: Slitting

[0083] See attached Figure 15 The copper-aluminum composite strip 1 is cut by a precision cutting machine so that the cut strips meet the design requirements of the high-voltage connector.

[0084] S4.3: Polishing.

[0085] It should be understood that the embedding groove of the present invention is not limited to the above-mentioned shape, but may also be other shapes such as a T-slot, a dovetail slot, etc.

[0086] It is worth noting that the contents not described in detail in the above embodiments are prior art. It is also worth noting that for those skilled in the art, any addition, subtraction, replacement and improvement made under the structure and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure, characterized in that: The following steps are involved: S1: preparing a special-shaped copper strip; when viewed from the cross-sectional direction, the upper plate surface of the special-shaped copper strip is a convex arc surface, and the lower plate surface is a plane or a concave arc surface; at least one embedding groove is provided on the lower plate surface, the bottom surface of the embedding groove is a concave arc surface, and at least one of the two groove side surfaces is inclined outward; S2: placing the lower plate surface of the profiled copper strip with the embedded groove on the aluminum liquid, and making the profiled copper strip tilt along the length direction of the embedded groove into the roller gap to perform cast-rolling compounding with the aluminum liquid; after the cast-rolling compounding, ensure that both groove edges are tilted outwards; S3: cold rolling and annealing; S4: Forming process.

2. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure as claimed in claim 1, characterized in that: In S1, the width of the upper plate surface is greater than the width of the lower plate surface.

3. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure as claimed in claim 1 or 2, characterized in that: In S1, a rounded corner is provided between the lower plate surface and the side plate surface.

4. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure as claimed in claim 2, characterized in that: The angle between the lower panel surface and the side panel surface is 110-150°.

5. The manufacturing process of the copper-aluminum composite strip with an embedded groove structure according to claim 1, characterized in that: In S1, a continuous extrusion or rolling process is used to prepare the special-shaped copper strip.

6. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure as claimed in claim 1, characterized in that: In S2, the special-shaped copper strip is cleaned and shot blasted before casting and rolling.

7. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure as claimed in claim 1, characterized in that: In S4, forming processing includes milling, slitting and grinding.

8. A process for manufacturing a copper-aluminum composite strip with an embedded groove structure as claimed in claim 7, characterized in that: During milling, the copper-clad surface is first milled based on the aluminum-clad surface of the copper-aluminum composite strip to ensure the distance from the bottom surface of the groove to the copper-clad surface, and then the aluminum-clad surface is milled based on the copper-clad surface to ensure the final thickness of the copper-aluminum composite strip.

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