A method for producing copper-aluminum composite strip
By designing polygonal shapes on the copper tape blank cross section of the copper-aluminum composite plate tape, including an inverted trapezoid and a first closed shape, and setting an arc-shaped second projection at the bottom of the inverted trapezoid, the problem of unstable aluminum liquid level is solved, and the stability of aluminum liquid level is achieved during the composite process.
Patent Information
- Application Number
- CN202510094266.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-04-08
AI Technical Summary
During the rolling process of existing copper-aluminum composite plate strips, the liquid aluminum surface of the aluminum is unstable, resulting in unstable composite.
The cross-section of the copper tape blank is polygonal, including an inverted trapezoid and a first closed shape. The bottom of the inverted trapezoid is provided with a second arc-shaped projection convexed downwardly. The semi-melted aluminum material and the copper tape blank are closely in contact with each other through continuous casting and rolling process to improve the stability of the aluminum liquid surface.
By uniformly increasing the contact area between the copper strip and the semi-melting aluminum, the disturbance of the semi-melting aluminum liquid level during the casting and rolling process is reduced, the stability of the aluminum liquid level is improved, and the composite quality is ensured.
Smart Images
Figure CN119772122A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of production methods for copper-aluminum composite strips, in particular to a production method for copper-aluminum composite strips. Background Art
[0002] The copper-aluminum composite strip with an inclined composite surface is a commonly used accessory in the battery field. This composite strip can be made by rolling a copper strip and semi-molten aluminum. The prior art usually uses a copper strip with a trapezoidal cross section as a rolling blank, and the rolled composite strip is surface processed to obtain a composite strip with an isosceles trapezoidal copper strip in the middle, and then the composite strip is cut in the extension direction to obtain two left and right finished products, which contain a copper strip with a right-angle trapezoidal cross section.
[0003] If the trapezoidal copper strip blank is placed forward (i.e. the cross section is a positive trapezoid), the aluminum liquid is easy to flip onto the copper during rolling, and the aluminum liquid level is unstable, resulting in composite instability. The trapezoidal copper strip blank is placed upside down (i.e. the cross section is an inverted trapezoid), and the aluminum liquid is not easy to flip onto the copper surface. This is a commonly used technical solution. However, during casting and rolling, the upper part of the inverted trapezoidal copper strip deforms faster (the copper strip needs to deform quickly during rolling to avoid the temperature of the semi-molten aluminum liquid dropping too much during rolling), and the stability of the aluminum liquid level is still not high enough.
[0004] Therefore, this technology needs to be improved. Summary of the invention
[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a method for producing a copper-aluminum composite plate and strip, which has the advantage of stabilizing the liquid level of aluminum liquid during composite.
[0006] The technical solution adopted by the present invention to solve the problem is:
[0007] A method for producing a copper-aluminum composite plate and strip comprises: step S1, melting an aluminum ingot and pouring it into a preheated casting nozzle, cooling and crystallizing the cast aluminum liquid to a semi-molten state to obtain a semi-molten aluminum material; step S2, bringing the semi-molten aluminum material into contact with the surface of a copper strip blank, performing continuous casting and rolling to obtain a composite mother blank; the composite mother blank comprises a first aluminum strip and a first copper strip, the bottom surface and left and right side surfaces of the first copper strip are both connected to the first aluminum strip; in step S2, the cross-section of the copper strip blank is polygonal, the bottom side of the first closed shape is arranged at the top side of the inverted trapezoid, and the top side of the first closed shape is shorter than its bottom side.
[0008] The bottom of the inverted trapezoid is provided with a second raised portion in an arc shape that bulges downward, and the middle thickness of the second raised portion is T4, and the range of T4 is 0-6mm.
[0009] In the step S2, the liquid level of the semi-molten aluminum material is not higher than the top height of the inverted trapezoid; the thickness of the composite mother blank is T10, and the range of T10 is 5-13 mm; the first copper strip is in an inverted trapezoid, the thickness of the first copper strip is T11, and the range of T11 is 3-12 mm; the top edge width of the first copper strip is W10, and the width of W10 is 11-240 mm; the bottom edge width of the first copper strip is W11, and the width of W11 is 5-200 mm; the lateral distance between the upper left vertex and the lower left vertex of the first copper strip is W12, and the range of W12 is 3-20 mm; the lateral distance between the upper right vertex and the lower right vertex of the first copper strip is W13, and the range of W13 is 3-20 mm.
[0010] The first closed shape is a regular trapezoid, and a first raised portion raised upward is provided on the top of the first closed shape. The middle thickness of the first raised portion is T3, and the range of T3 is 0-6 mm.
[0011] The copper strip blank has a thickness of T, and the range of T is 5-15 mm.
[0012] The bottom width of the inverted trapezoid is W, and the range of W is 5-200 mm.
[0013] The top edge width of the first closed shape is W1, and the width of W1 is 5-200 mm.
[0014] The height difference between the upper left vertex and the lower left vertex of the first closed shape is T1, and the range of T1 is 3-13 mm; the height difference between the upper right vertex and the lower right vertex of the first closed shape is T2, and the range of T2 is 3-10 mm.
[0015] The lateral position difference between the upper left vertex and the lower left vertex of the first closed shape is W2, and the range of W2 is 3-20 mm; the lateral position difference between the upper right vertex and the lower right vertex of the first closed shape is W3, and the range of W3 is 3-20 mm.
[0016] The method further includes the following steps after step S2: step S3, milling or grinding the top and bottom surfaces of the composite mother blank, and then cold rolling to obtain a semi-finished plate strip, wherein the semi-finished plate strip includes a second copper strip with an inverted trapezoidal cross-section, and a second aluminum strip and a third aluminum strip composited on the left and right sides of the second copper strip; step S4, cutting the obtained semi-finished plate strip into a first finished product and a second finished product along the length direction, wherein the first finished product includes the second aluminum strip and part of the second copper strip, the second finished product includes the third aluminum strip and the rest of the second copper strip, the interface between the second aluminum strip and part of the second copper strip is an inclined surface, and the interface between the third aluminum strip and the rest of the second copper strip is an inclined surface.
[0017] The beneficial effects of the present invention are:
[0018] Since the copper strip blank is provided with the first closed shape part, the middle part of the copper strip is pressed during the rolling process, and the contact area between the copper strip and the semi-molten aluminum material is uniformly enlarged, and the lower part of the semi-molten aluminum material and the liquid surface flow relatively uniformly, which can reduce the disturbance of the liquid surface of the semi-molten aluminum material during the casting and rolling process;
[0019] If the copper strip used is thinner, the trapezoidal copper strip is placed forward or inverted, and the aluminum liquid level is not high. However, when the copper strip is thicker, for example, when it is greater than 3mm, if a copper strip blank with an inverted trapezoidal cross-section is used, the semi-molten aluminum liquid level needs to be higher to ensure that the copper and aluminum are quickly compounded to ensure the composite quality, but the high liquid level of the semi-molten aluminum will cause the liquid level to be unstable, thereby reducing the local composite quality. By setting the second protrusion, in step S2, the bottom of the copper strip blank can contact the semi-molten aluminum material for the first time, achieving the effect of rapid contact between the copper strip blank and the semi-molten aluminum material, which can replace the solution of "raising the liquid level of the semi-molten aluminum material", but will not cause the semi-molten aluminum material to be unstable; at the same time, in the process of being pressed thin, the copper strip blank undergoes deformation in the middle and the left and right ends, and the deformation amount at each location is relatively uniform, rather than the deformation concentrated at the two vertices of the inverted trapezoid, thereby improving the stability of the semi-molten aluminum liquid level. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention will be further explained below in conjunction with the accompanying drawings and specific implementation methods.
[0021] Figure 1 A cross-sectional view of a copper strip blank according to a preferred embodiment of the present invention and a schematic diagram of deformation of the copper strip blank during casting and rolling;
[0022] Figure 2 It is a side view of semi-molten aluminum material, copper strip blank, upper roller and lower roller;
[0023] Figure 3 It is a partial enlarged front view of semi-molten aluminum material, copper strip blank, upper roller and lower roller;
[0024] Figure 4 is a cross-sectional view of the composite mother blank;
[0025] Figure 5 It is a cross-sectional view of the semi-finished plate strip;
[0026] Figure 6 It is a cross-sectional view of the first finished product and the second finished product.
[0027] In the figure: 1-semi-molten aluminum material, 2-copper strip blank, 3-composite mother blank, 4-first aluminum strip, 5-first copper strip, 6-semi-finished plate strip, 7-second copper strip, 8-second aluminum strip and, 9-third aluminum strip, 10-first finished product, 11-second finished product, 12-upper roller, 13-lower roller. DETAILED DESCRIPTION
[0028] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.
[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0030] In the description of the present invention, the meaning of "several" is one or more, the meaning of "more" is more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of the first and the second, it is only for the purpose of distinguishing the technical features, and it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In the description of the present invention, unless otherwise clearly defined, the terms such as "set", "install", and "connect" should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.
[0031] Reference Figures 1 to 6 , a method for producing a copper-aluminum composite strip, comprising:
[0032] Step S1, after melting the aluminum ingot, pour it into a preheated casting nozzle, and cool and crystallize the cast aluminum liquid to a semi-molten state to obtain a semi-molten aluminum material 1; Step S2, contact the semi-molten aluminum material 1 with the surface of a copper strip blank 2, and use an upper roller 12 and a lower roller 13 to continuously cast and roll to obtain a composite mother blank 3; the composite mother blank 3 includes a first aluminum strip 4 and a first copper strip 5, and the bottom surface and left and right side surfaces of the first copper strip 5 are connected to the first aluminum strip 4; in the step S2, the cross-section of the copper strip blank 2 is polygonal, the bottom side of the first closed shape is set at the top side of the inverted trapezoid, and the top side of the first closed shape is shorter than its bottom side.
[0033] The principle of the present invention is that since the cross section of the copper strip blank 2 also includes a first closed shape at the top, the first closed shape is thicker in the middle and thinner at the edge, when the copper strip blank 2 is compressed and deformed, the lower end point and the left and right end points move outward evenly, such as Figure 1 As shown, the disturbance to the liquid surface of the semi-molten aluminum material is reduced.
[0034] As a preferred embodiment, the bottom of the inverted trapezoid is provided with a second raised portion in an arc shape that bulges downward, the middle thickness of the second raised portion is T4, and the range of T4 is 0-6 mm.
[0035] As a preferred embodiment, in the step S2, the liquid level of the semi-molten aluminum material 1 is not higher than the top height of the inverted trapezoid, so as to avoid the top angle of the inverted trapezoid disturbing the liquid level of the semi-molten aluminum material 1; the thickness of the composite mother blank (3) is T10, and the range of T10 is 5-13 mm; the first copper strip (5) is inverted trapezoid, and the thickness of the first copper strip (5) is T11, and the range of T11 is 3-12 mm; the top edge width of the first copper strip (5) is W10, and the width of W10 is 11-240 mm; the bottom edge width of the first copper strip (5) is W11, and the width of W11 is 5-200 mm; the lateral distance between the upper left vertex and the lower left vertex of the first copper strip (5) is W12, and the range of W12 is 3-20 mm; the lateral distance between the upper right vertex and the lower right vertex of the first copper strip (5) is W13, and the range of W13 is 3-20 mm.
[0036] As a preferred embodiment, the first closed shape is a regular trapezoid, the top of the first closed shape is provided with a first raised portion that is raised upward, the middle thickness of the first raised portion is T3, and the range of T3 is 0-6 mm. During casting in step 2, the first raised portion is stressed first, that is, the middle part of the copper strip blank 2 is stressed first, which can ensure smooth extension on both sides.
[0037] In a preferred embodiment, the copper strip blank 2 has a thickness of T, and the range of T is 5-15 m.
[0038] In a preferred embodiment, the base width of the inverted trapezoid is W, and the range of W is 5-200 mm.
[0039] In a preferred embodiment, the top edge width of the first closed shape is W1, and the width of W1 is 5-200 mm.
[0040] In a preferred embodiment, the height difference between the upper left vertex and the lower left vertex of the first closed shape is T1, and the range of T1 is 3-13 mm; the height difference between the upper right vertex and the lower right vertex of the first closed shape is T2, and the range of T2 is 3-10 mm.
[0041] In a preferred embodiment, the lateral position difference between the upper left vertex and the lower left vertex of the first closed shape is W2, and the range of W2 is 3-20mm; the lateral position difference between the upper right vertex and the lower right vertex of the first closed shape is W3, and the range of W3 is 3-20mm.
[0042] In a preferred embodiment, after step S2, the following steps are also included:
[0043] Step S3, milling or grinding the top and bottom surfaces of the composite mother blank 3, and then cold rolling to obtain a semi-finished plate strip 6, wherein the semi-finished plate strip 6 includes a second copper strip 7 with an inverted trapezoidal cross-section, and a second aluminum strip and a third aluminum strip 9 composited on the left and right sides of the second copper strip 7;
[0044] Step S4, cutting the semi-finished plate strip 6 into a first finished product 10 and a second finished product 11 along the length direction, wherein the first finished product 10 includes a second aluminum strip and 8 parts of the second copper strip 7, and the second finished product 11 includes a third aluminum strip 9 and the remaining second copper strip 7, and the interface between the second aluminum strip and 8 parts of the second copper strip 7 is a bevel, and the interface between the third aluminum strip 9 and the remaining second copper strip 7 is a bevel.
[0045] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.
Claims
1. A method for producing a copper-aluminum composite strip, characterized in that: include: Step S1, after melting the aluminum ingot, pour it into a preheated casting nozzle, and cool the cast aluminum liquid to crystallize to a semi-molten state, so as to obtain a semi-molten aluminum material (1); Step S2, bringing the semi-molten aluminum material (1) into contact with the surface of the copper strip blank (2), and performing continuous casting and rolling to obtain a composite mother blank (3); the composite mother blank (3) comprises a first aluminum strip (4) and a first copper strip (5), and the bottom surface and left and right side surfaces of the first copper strip (5) are both in contact with the first aluminum strip (4); In the step S2, the cross section of the copper strip blank (2) is polygonal, the bottom side of the first closed shape is arranged at the top side of the inverted trapezoid, and the top side of the first closed shape is shorter than its bottom side.
2. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The bottom of the inverted trapezoid is provided with a second raised portion in an arc shape that bulges downward, and the middle thickness of the second raised portion is T4, and the range of T4 is 0-6mm.
3. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: In the step S2, the liquid level of the semi-molten aluminum material (1) is not higher than the top height of the inverted trapezoid; The thickness of the composite mother blank (3) is T10, and the range of T10 is 5-13 mm. The first copper strip (5) is in an inverted trapezoidal shape, and the thickness of the first copper strip (5) is T11, and the range of T11 is 3-12 mm. The top width of the first copper strip (5) is W10, and the width of W10 is 11-240 mm. The bottom width of the first copper strip (5) is W11, and the width of W11 is 5-200 mm. The lateral distance between the upper left vertex and the lower left vertex of the first copper strip (5) is W12, and the range of W12 is 3-20 mm. The lateral distance between the upper right vertex and the lower right vertex of the first copper strip (5) is W13, and the range of W13 is 3-20 mm.
4. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The first closed shape is a regular trapezoid, and a first raised portion raised upward is provided on the top of the first closed shape. The middle thickness of the first raised portion is T3, and the range of T3 is 0-6 mm.
5. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The thickness of the copper strip blank (2) is T, and the range of T is 5-15 mm.
6. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The bottom width of the inverted trapezoid is W, and the range of W is 5-200 mm.
7. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The top edge width of the first closed shape is W1, and the width of W1 is 5-200 mm.
8. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The height difference between the upper left vertex and the lower left vertex of the first closed shape is T1, and the range of T1 is 3-13 mm; the height difference between the upper right vertex and the lower right vertex of the first closed shape is T2, and the range of T2 is 3-10 mm.
9. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: The lateral position difference between the upper left vertex and the lower left vertex of the first closed shape is W2, and the range of W2 is 3-20 mm; the lateral position difference between the upper right vertex and the lower right vertex of the first closed shape is W3, and the range of W3 is 3-20 mm.
10. The method for producing a copper-aluminum composite plate and strip according to claim 1, characterized in that: After step S2, the method further includes the following steps: Step S3, milling or grinding the top and bottom surfaces of the composite mother blank (3), and then cold rolling to obtain a semi-finished plate strip (6), wherein the semi-finished plate strip (6) comprises a second copper strip (7) having an inverted trapezoidal cross section, and a second aluminum strip and (8) a third aluminum strip (9) composited on the left and right sides of the second copper strip (7); Step S4, cutting the obtained semi-finished plate strip (6) into a first finished product (10) and a second finished product (11) along the length direction, wherein the first finished product (10) includes the second aluminum strip and part (8) of the second copper strip (7), and the second finished product (11) includes the third aluminum strip (9) and the remaining part of the second copper strip (7), the boundary surface between the second aluminum strip and part (8) of the second copper strip (7) is an inclined surface, and the boundary surface between the third aluminum strip (9) and the remaining part of the second copper strip (7) is an inclined surface.