Preparation method of ultrathin red copper thin strip and ultrathin red copper thin strip

Abstract

The present application belongs to the technical field of materials in the radio frequency cable band and photovoltaic industry, and particularly relates to a preparation method of an ultrathin red copper band and the ultrathin red copper band. The preparation method comprises the following steps: milling the upper and lower surfaces of the horizontally continuous casting red copper cast blank, sequentially performing multi-pass rough rolling, intermediate rolling, annealing treatment, pre-precision rolling, annealing treatment, precision rolling, annealing treatment, and cleaning and slitting, so as to obtain the ultrathin red copper band. The present application has the following beneficial effects: the problems of easy adhesion and poor grain of the ultrathin red copper band are solved; the problems of easy breakage of the ultrathin red copper band cleaning line and incomplete surface cleaning are solved; the problem of extremely high technical difficulty of the soft state red copper band slitting and tool setting is solved; the problem of many defects of the soft state red copper band slitting is solved; the problem of extremely high tool precision requirement of the soft state red copper band slitting is solved; and the problem of end face damage of the soft state red copper band slitting and packaging is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of materials in the radio frequency cable band and photovoltaic industry, and particularly relates to a preparation method of an ultrathin red copper band and an ultrathin red copper band. BACKGROUND

[0002] With the development of the telecommunication and power industries, the development speed of the wire and cable industry in China will be higher than the development speed of the national economy, and is expected to be more than 15%. From the product development trend, the demand structure of the copper plate band presents a complex situation of multi-level and diversification, and develops towards the direction of ultrathin, high quality and high precision. The soft-state red copper ultrathin band product industry develops rapidly, and the market demand is large. According to the forecast of the China Machinery Industry Federation, the red copper band used for outer coating of the radio frequency cable band reaches 200,000 tons in 2018, the red copper band used for the copper-clad aluminum conductor material reaches 100,000 tons, and the red copper band used for the photovoltaic industry reaches 50,000 tons.

[0003] The processing cost of the red copper ultrathin band is twice as high as that of the ordinary red copper band, but many domestic enterprises are limited by the equipment technical level and other reasons, so that it is difficult to realize the industrialization of the soft-state red copper ultrathin band. In particular, the quality requirement of the soft-state red copper ultrathin band is very high, and the control difficulty of the edge shearing quality is large. The main quality problems in shearing are that a large number of burrs, curled edges, indented edges and knife marks are easily generated after shearing. At the same time, because the product has the characteristics of soft material, thin thickness, narrow width and large coil weight, the quality problems such as deformation, scratch and bruise are easily generated in the subsequent packaging process, which causes many customer complaints and returns, and the yield is difficult to improve.

[0004] Therefore, it is the inevitable direction of material development and the inevitable requirement of the market to overcome the production difficulties of the soft-state red copper ultrathin band and develop the high-precision and ultrathin slitting red copper band required by the market. SUMMARY

[0005] The application discloses a preparation method of an ultrathin red copper band and the ultrathin red copper band to solve the above and any potential problems in the prior art.

[0006] In order to solve the above technical scheme, the technical scheme in the application is as follows: a preparation method of an ultrathin red copper band, which specifically comprises the following steps:

[0007] S1) milling the upper and lower surfaces of the horizontally continuous casting red copper cast blank to obtain a red copper cast blank with a certain thickness, and then performing multi-pass rough rolling to obtain a rough rolled red copper band blank;

[0008] S2) performing multi-pass intermediate rolling on the rough rolled red copper band blank obtained in S1) to obtain an intermediate rolled red copper band blank, and then performing intermediate annealing treatment;

[0009] S3) the red copper strip blank processed in S2) is pre-rolled in multiple passes, and then is subjected to pre-rolling annealing treatment;

[0010] S4) the red copper strip blank processed in S3) is rolled in multiple passes, and then is subjected to pre-rolling annealing treatment;

[0011] S5) the red copper strip blank processed in S4) is subjected to pickling and slitting, and then is obtained.

[0012] Further, the rough rolling process in S1) is specifically as follows: the upper work roll is a convex roll, and the lower work roll is a flat roll, wherein the convexity of the upper work roll is 0.02-0.05 mm; the rolling deformation is 80-95%.

[0013] Further, the medium rolling process in S2) is specifically as follows: the process lubrication adopts full oil lubrication, the rolling force is 2000-3000 kN, the bending roll method adopts positive bending, the bending roll force is 30-40 kN, and the medium rolling deformation is about 40-60%.

[0014] The intermediate annealing is performed by using an air cushion furnace, the annealing temperature is 650-700℃, and the annealing speed is 30-50 mm / min.

[0015] Further, the tensile strength of the red copper strip blank is 200-250 MPa, the elongation is 30-40%, the Vickers hardness is 50-60, and the grain size is 0.01-0.03 mm.

[0016] Further, the pre-rolling process in S3) is specifically as follows: the auxiliary hydraulic bending roll force is adopted, and the method of adopting a rear tension greater than a front tension by 1-3 kN is adopted; after the pre-rolling, the intermediate annealing is also performed by using an air cushion furnace, the annealing temperature is 650-700℃, the annealing speed is 60-70 mm / min, the tensile strength after the pre-rolling is 200-250 MPa, the elongation is 30-40%, the Vickers hardness is 50-60, and the grain size is 0.01-0.03 mm.

[0017] Further, the rolling process in S4) is specifically as follows: the rolling speed during the rolling process is kept within the range of 220-290 m / min, the front tension is controlled within the range of 6-7 kN, and the rear tension is controlled within the range of 7-8 kN. After the rolling, the red copper strip blank is first wound on a rewinding machine, the tension during the rewinding is controlled within the range of 200-300 N, and then the red copper strip blank is subjected to product annealing in a bell furnace, the temperature is raised to 280-320℃ at a speed of 50-100℃ / h, and the annealing is kept for 4-8 h. After the annealing in the bell furnace, the tensile strength is 200-250 MPa, the elongation is 30-40%, the Vickers hardness is 50-60, the grain size is 0.01-0.03 mm, and the electrical conductivity is 100-101% IACS.

[0018] Further, the specific process of the S5) cleaning is: using 15-18N / mm 2 The range is within the unit tension, the cleaning speed is controlled at 30-40m / min, the grinding brush rotating speed is controlled at 600-800rpm, the pickling temperature in the cleaning is 20-40℃, the acid concentration is 10-15%, the alkali concentration is 3%, the passivation liquid concentration is controlled at 0.07-0.12%, and the 3M water absorption squeeze drying roller and air knife blowing combined mode is adopted after passivation. After cleaning, the cutting is carried out, and the cut ultra-thin red copper strip is packaged.

[0019] Further, the horizontal gap of the upper and lower adjacent knives of the cutting knife is 0.001-0.002mm, the vertical spacing overlap is 0.05-0.7mm, the outer diameter of the public rubber ring is larger than the outer diameter of the disc knife by 0.15mm-0.2mm, and the outer diameter of the female rubber ring is smaller than the outer diameter of the disc knife by 0.2mm-0.25mm.

[0020] An ultra-thin red copper strip is characterized in that the ultra-thin red copper strip is prepared by the above preparation method, the surface of the prepared ultra-thin red copper strip is smooth, there is no stain, the edge part is free of burrs and warping, the burr height is less than or equal to 10mm, the grain size of the finished product is less than or equal to 0.0116mm, and the electrical conductivity is 100-101% IACS.

[0021] The beneficial effects of the present application are: (1) the present application adopts the mode that the upper work roll is a convex roll and the lower work roll is a flat roll, which solves the problem of too large transverse thickness difference of the plate. The good control of pass and total reduction ratio in the intermediate rolling controls the transverse thickness difference of the strip. The method that the rear tension is greater than the front tension by 1-3KN is adopted to effectively control the longitudinal thickness tolerance of the strip by using the pre-rolling auxiliary hydraulic bending roll force. The pass reduction ratio is less than 30%, the work roll pairing difference is less than 0.02mm, and the unit large tension control mode is adopted in the finishing rolling, which effectively controls the product thickness tolerance and the shape.

[0022] (2) In the rolling process, the present application adopts the mode that the air cushion furnace and the bell furnace are combined to anneal the strips of different thicknesses. The air cushion furnace is adopted for annealing in the intermediate rolling and the pre-finishing rolling to ensure the uniformity of the strips after annealing. The bell furnace is adopted for annealing after the finishing rolling to ensure that the finished product is fully recrystallized. Finally, the prepared red copper strip has uniform organization and performance, and the grain size is 0.01-0.03mm.

[0023] (3) The stains on the surface of the strip need to be cleaned in the rolling process. The belt tension and the curling tension are controlled to ensure that the strip is not broken during the winding; and the speed, the grinding brush rotating speed and the cleaning liquid temperature are set to ensure that the surface of the strip is smooth and free of stains.

[0024] (4) The strip rolled to the finished thickness needs to be subjected to a slitting process, and when the slitting cutter is arranged, the horizontal gap of the adjacent cutters on the upper and lower sides is 0.001-0.002 mm, and the overlapping amount of the vertical gap is 0.05-0.7 mm, and after the slitting is performed by using the cutter arrangement process, the quality of the edge part is good.

[0025] (5) In the rolling production process, the inner diameter of the paper tube is uniformly Φ296±0.5 mm when winding, and the gap between the separating disc and the compression roller is adjusted to 3 mm, which can avoid the copper strip layering error.

[0026] (6) When the copper strip is cut and packaged, the winding tension is controlled to be 12 N / mm 2 left and right during the automatic packaging process, which can prevent falling and prevent the convex surface from being sucked out.

[0027] 6. Advantages and positive effects

[0028] Through the overall research on the production process, slitting technology and packaging method of the red copper ultra-thin strip, a new process for producing the ultra-thin red copper strip and the slitting strip is formed, and the quality problems of the soft red copper thin strip such as slitting edge, burr, wave, layering error and tower shape are effectively solved, and the product return rate is significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a flowchart of a preparation method of an ultra-thin red copper strip. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be further described below in combination with the drawings and specific embodiments.

[0031] As Figure 1 shown, the preparation method of the ultra-thin red copper strip specifically includes the following steps:

[0032] S1) Milling the upper and lower surfaces of the horizontally continuous cast red copper cast blank to obtain a red copper cast blank with a certain thickness, and then performing multi-pass rough rolling to obtain a rough rolled red copper strip blank;

[0033] S2) performing multi-pass intermediate rolling on the rough rolled red copper strip blank obtained in S1) to obtain an intermediate rolled red copper strip blank, and then performing intermediate rolling annealing treatment;

[0034] S3) performing multi-pass pre-precision rolling on the red copper strip blank treated in S2), and then performing pre-precision rolling annealing treatment;

[0035] S4) performing multi-pass precision rolling on the red copper strip blank treated in S3), and then performing annealing treatment;

[0036] S5) performing pickling and slitting on the red copper strip blank treated in S4), so as to obtain an ultra-thin red copper thin strip with a thickness of 0.05-0.08 mm.

[0037] The S1) rough rolling process is as follows: the upper work roll is convex, the lower work roll is flat, the convexity of the upper work roll is 0.02-0.05 mm, and the deformation is 80-95%, and the thickness of the rough rolled red copper strip blank is 1-1.2 mm.

[0038] The S2) intermediate rolling process is as follows: the lubrication mode is full oil lubrication, the rolling force is 2000-3000 kN, the bending mode is positive bending, the bending force is 30-40 kN, and the intermediate rolling deformation is 40-60%.

[0039] The intermediate annealing is performed by using an air cushion furnace, the annealing temperature is 650-700℃, the annealing speed is 30-50 mm / min, and the thickness of the intermediate annealed red copper strip blank is 0.4-0.6 mm.

[0040] The tensile strength of the intermediate rolled red copper strip blank is 200-250 MPa, the elongation is 30-40%, the Vickers hardness is 50-60, and the grain size is 0.01-0.03 mm.

[0041] The S3) pre-finishing process is as follows: the auxiliary hydraulic bending force is used during rolling, and the rear tension is greater than the front tension by 1-3 kN; the intermediate annealing is also performed by using an air cushion furnace after pre-finishing, the annealing temperature is 650-700℃, the annealing speed is 60-70 mm / min, and the thickness of the pre-finished red copper strip blank is 0.15-0.25 mm.

[0042] The S4) finishing process is as follows: the rolling speed during rolling is kept in the range of 220-290 m / min, the front tension is controlled in the range of 6-7 kN, and the rear tension is controlled in the range of 7-8 kN; after finishing, the red copper strip blank is first wound on a rewinding machine, the tension during rewinding is controlled in the range of 200-300 N, then the red copper strip blank is annealed in a bell furnace after rewinding, the temperature is raised to 280-320℃ at a speed of 50-100℃ / h, and the thickness of the finished red copper strip blank is 0.05-0.08 mm.

[0043] The S5) cleaning process is as follows: the winding tension is in the range of 15-18 N / mm 2 The winding speed is controlled in the range of 30-40 m / min, the grinding brush speed is controlled in the range of 600-800 rpm, the pickling temperature during cleaning is in the range of 20-40℃, then passivation is performed, the passivation liquid concentration is controlled in the range of 0.07-0.12%, and the cleaned red copper strip is cut and packaged.

[0044] The acid concentration during pickling is in the range of 10-15%, the alkali concentration is 3%, and the passivation liquid concentration is controlled in the range of 0.07-0.12%.

[0045] The horizontal gap between the upper and lower adjacent knives of the slitting time distribution knife is 0.001-0.002mm, the vertical spacing overlap is 0.05-0.7mm, the outer diameter of the common glue ring is larger than the outer diameter of the disc knife by 0.15mm-0.2mm, and the outer diameter of the female glue ring is smaller than the outer diameter of the disc knife by 0.2mm-0.25mm.

[0046] The surface of the ultra-thin red copper thin strip is smooth, the edge is free of stains, there is no burr and edge curl, the burr height is ≤10mm, the grain size of the finished product is ≤0.0116mm, and the electrical conductivity is 100-101% IACS.

[0047] Embodiment:

[0048] The thickness of the upper and lower surfaces of the horizontally continuous cast red copper cast blank is 15.15mm after milling, and cold rough rolling is carried out after milling. The rolling pass distribution of cold rough rolling is 15.15-9.5-6.3-4.2-2.8-1.7-1.15, and the thickness is reduced from 15.15mm to 1.15mm. During rough rolling, the upper work roll is convex, and the lower work roll is flat. The convexity of the upper work roll is 0.04mm. After rough rolling, medium rolling is carried out. The rolling pass distribution of medium rolling is 1.15-0.86-0.64-0.5. During medium rolling, full oil lubrication is used for process lubrication. The rolling force is stable in the range of 2000kN-3000kN according to the rolling deformation of the strip. The bending roll method is positive bending, and the bending roll force is 30-40KN. During medium rolling, the lifting speed time is shortened from 20 seconds to 10 seconds at the unstable stage of the head and tail, and the rolling tension is increased from 30kN to 35kN. After medium rolling, the strip is annealed in a gas cushion furnace. The annealing temperature is 680℃, and the annealing speed is 45mm / min. After medium annealing, the tensile strength is 226.2MPa, the elongation is 39.7%, the Vickers hardness is 59.4, and the grain size is 0.02mm.

[0049] After the intermediate annealing, the copper strip is pre-rolled, and the pre-rolling pass distribution is 0.5-0.315-0.23-0.2. During the pre-rolling, the auxiliary hydraulic bending force is adopted, and the method of the back tension being greater than the front tension by 1-3 kN is adopted. The front tension of the first pass is 25 kN, and the back tension is 27 kN. The front tension of the second pass is 26 kN, and the back tension is 27 kN. The front tension of the third pass is 26 kN, and the back tension is 27 kN. After the pre-rolling, the copper strip is also subjected to the intermediate annealing in the air cushion furnace, the annealing temperature is 680℃, the annealing speed is 68 m / min, the tensile strength after the pre-rolling is 222.4 MPa, the elongation is 33.5%, the Vickers hardness is 58.9, and the grain size is 0.018 mm. After the pre-rolling and the air cushion furnace annealing, the copper strip is subjected to the finishing rolling, and the finishing rolling is performed by the 20-roller finishing rolling machine produced by the United States I2S. The finishing rolling pass distribution is 0.2-0.14-0.098-0.07, the rolling speed during the rolling process is maintained within the range of 220-290 m / min, the front tension is controlled within the range of 6-7 kN, and the back tension is controlled within the range of 7-8 kN. After the finishing rolling to 0.07 mm, the copper strip is first subjected to the rewinding in the rewinder, the tension during the rewinding is controlled at about 260 N, and then the copper strip is subjected to the product annealing in the bell furnace, and the temperature is raised to 300℃ at the rate of 100℃ / h, and the annealing is maintained for 6 h. The tensile strength after the bell furnace annealing is 242.0 MPa, the elongation is 31.5%, the Vickers hardness is 51.3, the grain size is 0.016 mm, and the conductivity is 100.3% IACS. After the bell furnace annealing, the copper strip is subjected to the cleaning, and the unit tension during the cleaning is within the range of 15-18 N / mm 2 The cleaning speed is controlled at 30-40 m / min, and the grinding brush rotating speed is controlled at 600-800 rpm. The pickling temperature during the cleaning is 20-40℃, the acid concentration is 10-15%, the alkali concentration is 3%, the passivation liquid concentration is controlled at 0.07-0.12%, and the 3M water absorption squeeze roller and the air knife blowing combination are adopted after the passivation. After the cleaning, the copper strip is subjected to the slitting, and the horizontal gap of the upper and lower adjacent knives is 0.001-0.002 mm, and the vertical spacing overlap is 0.05-0.7 mm. The slit super-thin red copper strip is packaged, the manual packaging method is adopted for the copper strip with small coil weight and outer diameter, and the automatic packaging line is adopted for the copper strip with large coil weight and outer diameter.

[0050] The performance test results of the product produced according to the above production process are as follows.

[0051] Table 1, performance index test results of the product

[0052] Indicators Detection results Chemical composition Cu: 99.9736% Surface defects No stains on the surface Burr height ≤ 10 mm Finished grain size: Grain size: 0.0116 mm Plate type ≤3I Main performance indicators Vickers hardness: 51.3 HV

[0053] The preparation method of the ultra-thin red copper thin strip and the ultra-thin red copper thin strip provided by the embodiments of the application are described in detail above. The above description of the embodiments is only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation and application range can be changed, and the content of the description should not be understood as a limitation on the application.

[0054] As used in the specification and claims, certain terminology is used to describe certain components. Those of ordinary skill in the art will understand that different manufacturers of hardware can refer to the same component using different names. The specification and claims should not be controlled based on differences in naming alone, but rather on the difference in functionality of the components. As used throughout the specification and claims, "comprising" and "including" are open-ended terms that are to be interpreted in the same way as "comprising but not limited to." "About" refers to a range that is acceptable within an acceptable error range for a person of ordinary skill in the art to solve the technical problem and substantially achieve the technical effect. The subsequent description of the specification is a preferred embodiment for implementing the application, and the description is for the purpose of illustrating the general principles of the application, not to limit the scope of the application. The scope of protection of the application is subject to the appended claims.

[0055] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such product or system. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the product or system comprising the element.

[0056] It should be understood that the term "and / or" used herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0057] The above description shows and describes several preferred embodiments of the application, but as mentioned above, it should be understood that the application is not limited to the form disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified by the above teaching or related art or knowledge within the scope of the application. The changes and modifications made by those skilled in the art without departing from the spirit and scope of the application shall be within the scope of protection of the appended claims of the application.

Claims

1. A method for preparing an ultra-thin copper strip, characterized in that: The preparation method specifically comprises the following steps: S1) milling the upper and lower surfaces of the horizontally continuously cast copper ingot to obtain a copper ingot, and then performing multiple passes of rough rolling to obtain a rough-rolled copper strip; The rough rolling process is specifically as follows: during rough rolling, the upper working roll is a convex roll and the lower working roll is a flat roll, wherein the crown of the upper working roll is 0.02-0.05 mm; the total deformation is 80-95%, and the thickness of the rough-rolled copper strip is 1-1.2 mm; S2) performing multiple intermediate rolling on the rough-rolled copper strip obtained in S1) to obtain an intermediate-rolled copper strip, and then performing intermediate rolling annealing treatment; S3) performing multiple passes of pre-finish rolling on the copper strip processed in S2), and then performing a pre-finish rolling annealing treatment; S4) performing multiple passes of finish rolling on the copper strip processed in S3), and then performing annealing treatment; The specific process of the finishing rolling is as follows: the pre-tension is controlled at 6-7 kN, and the post-tension is controlled at 7-8 kN; after finishing rolling, the copper strip is first rewound on a rewinder with the tension controlled at 200-300 N, and then annealed in a bell furnace at a temperature of 50-100 ° C / h to 280-320 ° C and held at that temperature for 4-8 hours. The thickness of the finished copper strip is 0.05-0.08 mm. S5) Cleaning and slitting the copper strip processed in S4) to obtain an ultra-thin copper strip with a thickness of 0.05-0.08 mm.

2. The preparation method according to claim 1, characterized in that The medium-rolled copper strip has a tensile strength of 200-250 MPa, an elongation of 30-40%, a Vickers hardness of 50-60, and a grain size of 0.01-0.03 mm.

3. The preparation method according to claim 1, characterized in that The specific process of the pre-finishing rolling in S3) is as follows: during rolling, auxiliary hydraulic bending roll force is used, and the post tension is 1-3 kN greater than the pre tension; after the pre-finishing rolling, intermediate annealing is also carried out in an air cushion furnace, the annealing temperature is 650-700°C, the annealing speed is 60-70 m / min, and the thickness of the pre-finishing rolled copper strip is 0.15-0.25 mm.

4. The preparation method according to claim 1, characterized in that The specific cleaning process in S5) is: using 15-18N / mm 2 The copper strip is wound at a unit tension within a certain range. At a temperature of 20-40°C, the cleaning speed is controlled at 30-40m / min, and the grinding brush speed is controlled at 600-800rpm / min. It is first pickled, then alkaline washed, and then passivated. After passivation, a 3M water-absorbing and squeezing roller and air knife blowing combination is used. After cleaning, it is slit and the slit ultra-thin copper strip is packaged.

5. The preparation method according to claim 4, characterized in that During the pickling, the acid concentration is 10-15%, during the alkali washing, the alkali concentration is 3%; during the passivation, the passivation solution concentration is controlled at 0.07-0.12%.

6. The preparation method according to claim 4, characterized in that The horizontal gap between the upper and lower adjacent knives of the knife during slitting is 0.001-0.002mm, the vertical spacing overlap is 0.05-0.7mm, the outer diameter of the male rubber ring is 0.15mm-0.2mm larger than that of the disc knife, and the outer diameter of the female rubber ring is 0.2mm-0.25mm smaller than that of the disc knife.

7. An ultra-thin copper strip, characterized in that: The ultra-thin copper strip is prepared by the preparation method according to any one of claims 1 to 6. The surface of the ultra-thin copper strip is smooth and free of stains, burrs and warping on the edges, the burr height is ≤10mm, the grain size of the finished product is ≤0.0116mm, and the conductivity is 100-101% IACS.

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