Sleeve for keeping flat plate shape of wide copper plate strip and plate shape control method

Abstract

The invention relates to the technical field of wide copper plate strips, and discloses a sleeve for keeping a flat plate shape of a wide copper plate strip and a plate shape control method.The sleeve comprises a sleeve body, a plurality of long-strip-shaped grooves are formed in the outer surface of the sleeve body, the number of the grooves is larger than three, and the grooves are annularly arrayed in the outer surface of the sleeve body. According to the sleeve for keeping the flat plate shape of the wide copper plate strip and the plate shape control method, when the strip wraps the sleeve, quite large pressure stress can be generated on the sleeve, the sleeve can generate large inward deformation, the shallow grooves in the sleeve can evenly disperse the pressure stress to all the sections of the sleeve, and when the sleeve and the strip are subjected to annealing heat treatment at the same time, the sleeve is not prone to deformation. And the heat treatment temperature can release the pressure stress on each section of the sleeve, when the strip is separated from the sleeve, the deformation of the surface of the sleeve starts to rebound due to no influence of the pressure stress, and the surface of the sleeve recovers to be flat.

Description

Technical Field

[0001] The invention relates to the technical field of wide copper strips, and in particular to a sleeve for maintaining a flat plate shape of a wide copper strip and a plate shape control method. Background Art

[0002] High-strength conductive copper alloys have high strength and excellent electrical and thermal conductivity. They are key structural functional materials in high-tech fields such as electronic information, transportation, aviation, aerospace, and new energy. Their strip products are widely used in the manufacture of integrated circuit lead frames, precision electronic components and connectors, etc. With the rapid development of industries such as electronic communications, high load, high reliability and long service life have become the main development direction of conductor functional devices, which makes the service conditions of high-strength conductive copper alloys used for signal transmission, structural support and thermal management systems more demanding, requiring not only higher strength and good electrical conductivity, but also excellent bending resistance or toughness.

[0003] At present, the main preparation method of high-strength conductive copper alloy strip is to use the traditional "semi-continuous ingot casting → hot rolling → milling → cold rolling → solutionizing → cold rolling → aging" process [see: Wang Mingpu et al., A CuNiSiMg alloy material and its preparation method and a method for preparing a strip from the alloy material, Chinese invention patent, authorization number ZL201210209072.8; Zhu Yongbing, Guo Fuan, Li Huaqing, Modified preparation method of Cu-Cr-Zr alloy plate, Chinese invention patent, application number CN200810235978.0].

[0004] The wide copper plates and strips produced by traditional preparation processes have insufficiently refined grains and large residual stresses, which makes it difficult to control the uniformity of the organization of the wide copper plates and strips, resulting in large deviations in the strength and hardness of the strips during use; at the same time, a series of problems will also arise, such as unstable rolling dimensions, poor dimensional accuracy control, and poor product surface quality. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a sleeve and a plate shape control method for maintaining a flat plate shape of a wide copper plate and strip, which solves the problems of insufficient grain refinement and large residual stress in the wide copper plate and strip produced by the traditional preparation process, resulting in difficulty in controlling the uniformity of the structure of the wide copper plate and strip, and causing large deviations in the strength and hardness of the strip during use; at the same time, there will also be problems such as unstable rolling size, poor dimensional accuracy control, and poor product surface quality.

[0006] The present invention provides the following technical solution: a sleeve for maintaining a flat plate shape of a wide copper plate strip and a plate shape control method, comprising a sleeve, wherein the outer surface of the sleeve is provided with a plurality of long strip-shaped grooves, the number of the grooves is greater than three, and the grooves are arranged in a circular array on the outer surface of the sleeve.

[0007] A method for controlling the shape of a wide copper strip to maintain a flat shape comprises the following steps:

[0008] S1, coiling, winding the wide copper strip on the outer surface of the sleeve;

[0009] S2, solution treatment: solution quenching the wide copper strip and making coils;

[0010] S3, annealing treatment, transferring the quenched wide copper plate to a heat treatment furnace, directly heating it up, and performing multi-stage homogenization annealing treatment;

[0011] S4, annealing and cooling;

[0012] S5, pickling: put the cooled wide copper plate into the pickling tank and soak it for 15 minutes;

[0013] S6 Neutralization washing: Put the wide copper plate treated in step S5 into a water pool and neutralize the wide copper plate with a neutralizer to avoid residual acid, and then rinse with clean water for 3-5 times;

[0014] S7 Finished product rolling: The wide copper plate processed in step S6 is subjected to finished product finish rolling, with a rolling deformation of 5-9%. After trimming, cleaning, stretching and bending correction, a finished wide copper plate strip is obtained.

[0015] This solution can generate considerable compressive stress on the sleeve when the strip wraps around the sleeve, causing the sleeve to undergo a large inward deformation. The shallow grooves on the sleeve can evenly disperse the compressive stress to each segment of the sleeve. When the sleeve and the strip are simultaneously annealed and heat treated, the heat treatment temperature will release the compressive stress on each segment of the sleeve. When the strip detaches from the sleeve, the deformation on the sleeve surface begins to rebound because it is not affected by the compressive stress, and the sleeve surface becomes flat again.

[0016] According to this feature of the special sleeve, the strip shape is always in a relatively flat state on the sleeve, and the rolling stress of the strip surface remains consistent after rolling. After annealing heat treatment, the rolling stress of the sleeve and the strip is released, so that the strip can fit flatly on the sleeve, thereby keeping the strip shape flat. Preferred technical solution: The multi-stage homogenization annealing treatment in step S3 includes the following steps:

[0017] S301 first heating and temperature-fixing treatment; the heating rate of the first heating and temperature-fixing treatment is 70°C / h, the temperature of the first heating and temperature-fixing treatment is 500-520°C, and the temperature-fixing time of the first heating and temperature-fixing treatment is 10h;

[0018] S302 second heating and temperature setting treatment; the heating rate of the second heating and temperature setting treatment is 80°C / h, the temperature setting temperature of the second heating and temperature setting treatment is 520-540°C, and the temperature setting time of the second heating and temperature setting treatment is 12h;

[0019] S303 is the third heating and temperature-fixing treatment; the heating rate of the third heating and temperature-fixing treatment is 30°C / h, the temperature of the third heating and temperature-fixing treatment is 540-560°C, the temperature-fixing time of the third heating and temperature-fixing treatment is 50h, and the temperature of the third heating and temperature-fixing treatment is higher than the temperature of the second heating and temperature-fixing treatment.

[0020] This solution can transfer the wide copper strip to the heat treatment furnace for slow cooling, then perform stress relief annealing at a constant temperature, and finally directly heat up for multi-stage homogenization annealing. This operation can not only reduce the number of high and low temperature conversions for heating and heat dissipation, reduce the risk of cracking of the wide copper strip, save energy, and shorten the annealing cycle, but also combine the multi-stage homogenization annealing process to force the alloy coarse intermediate phase to dissolve back, significantly improving the homogenization effect of the ingot.

[0021] Preferred technical solution: The annealing and cooling in step S4 is performed by annealing in a bell-type furnace. After the heating and heat preservation is completed, the outer bell is replaced with a cooling bell, and the cooling bell pumps water up and sprays it onto the outside of the inner bell for cooling.

[0022] Preferred technical solution: In step S5, the pickling liquid is one of sulfuric acid, hydrochloric acid, phosphoric acid and nitric acid.

[0023] Preferred technical solution: During the homogenization annealing process in step S3, one of nitrogen, hydrogen or a nitrogen-hydrogen mixture is introduced as a protective gas.

[0024] Preferred technical solution: The wide copper plate comprises the following components in percentage by mass: Cr 0.1-0.3%, Ag 0.05-0.07%, Zr 0.1-0.3%, Fe 1-5%, and the remainder is Cu and unavoidable impurities.

[0025] Preferred technical solution: In step S7, the rolling force is 200-230 KN, and the rolling speed is 50-60 m / min.

[0026] Compared with the prior art, the present invention provides a sleeve and a method for controlling the flatness of a wide copper strip, which has the following beneficial effects:

[0027] The sleeve and shape control method for maintaining the flat shape of the wide copper strip, when the strip wraps around the sleeve, will produce considerable compressive stress on the sleeve, causing the sleeve to have a large inward deformation, the shallow groove on the sleeve can evenly disperse the compressive stress to each segment of the sleeve, when the sleeve and the strip are annealed and heat treated at the same time, the heat treatment temperature will release the compressive stress on each segment of the sleeve, when the strip is separated from the sleeve, the deformation of the sleeve surface begins to rebound because it is not affected by the compressive stress, and the sleeve surface returns to flatness. According to this feature of the special sleeve, the strip shape is always in a relatively flat state on the sleeve, and the rolling stress of the strip surface remains consistent after rolling. After annealing and heat treatment, the rolling stress of the sleeve and the strip is released, so that the strip can fit flatly on the sleeve, thereby keeping the strip shape flat.

[0028] The sleeve and shape control method for maintaining the flat shape of the wide copper strip propose a preparation method for high-strength and high-toughness conductive copper alloy strip based on "hot rolling blanking → solution treatment → coiling → annealing treatment", which solves the problems of the wide copper strip produced by the traditional preparation process, such as insufficient grain refinement and large participating stress, which makes it difficult to control the uniformity of the organization of the wide copper strip, resulting in large deviations in the strength and hardness of the strip during use; at the same time, a series of problems such as unstable rolling size, poor dimensional accuracy control, and poor product surface quality will occur.

[0029] During the annealing process, the recrystallization process can be accelerated, residual stress can be improved, the behavior of the precipitated phase can be controlled, and the annealing temperature can be reduced, which has a significant positive effect on the quenching and annealing process. These effects not only improve the performance and stability of the material, but also reduce production costs and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the sleeve structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the side view structure of the sleeve of the present invention;

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of the sleeve of the present invention.

[0033] In the figure: 1. Sleeve; 2. Long strip-shaped groove. DETAILED DESCRIPTION

[0034] See also Figure 1-3 A sleeve for maintaining a flat plate shape of a wide copper strip and a plate shape control method include a sleeve 1, the outer surface of the sleeve 1 is provided with a plurality of long strip-shaped grooves 2, the number of the grooves 2 is greater than three, and they are arranged in a circular array on the outer surface of the sleeve 1.

[0035] A method for controlling the shape of a wide copper strip to maintain a flat shape comprises the following steps:

[0036] S1, coiling, winding the wide copper strip on the outer surface of the sleeve;

[0037] S2, solution treatment: solution quenching the wide copper strip and making coils;

[0038] S3, annealing treatment, transferring the quenched wide copper plate to a heat treatment furnace, directly heating it up, and performing multi-stage homogenization annealing treatment;

[0039] S4, annealing and cooling;

[0040] S5, pickling: put the cooled wide copper plate into the pickling tank and soak it for 15 minutes;

[0041] S6 Neutralization washing: Put the wide copper plate treated in step S5 into a water pool and neutralize the wide copper plate with a neutralizer to avoid residual acid, and then rinse with clean water for 3 times;

[0042] S7 Finished product rolling: The wide copper plate processed in step S6 is subjected to finished product finish rolling, with a rolling deformation of 5-9%. After trimming, cleaning, stretching and bending correction, a finished wide copper plate strip is obtained.

[0043] Furthermore, the multi-stage homogenization annealing treatment in step S3 includes the following steps:

[0044] S301 first heating and temperature-fixing treatment; the heating rate of the first heating and temperature-fixing treatment is 70°C / h, the temperature of the first heating and temperature-fixing treatment is 500-520°C, and the temperature-fixing time of the first heating and temperature-fixing treatment is 10h;

[0045] S302 is the second heating and temperature fixing process; the heating rate of the second heating and temperature fixing process is 80°C / h, the temperature fixing temperature of the second heating and temperature fixing process is 520°C, and the temperature fixing time of the second heating and temperature fixing process is 12h;

[0046] S303 is the third heating and temperature-fixing treatment; the heating rate of the third heating and temperature-fixing treatment is 30℃ / h, the temperature of the third heating and temperature-fixing treatment is 540℃, the temperature-fixing time of the third heating and temperature-fixing treatment is 50h, and the temperature of the third heating and temperature-fixing treatment is higher than the temperature of the second heating and temperature-fixing treatment.

[0047] Furthermore, the annealing and cooling in step S4 is performed by annealing in a bell-type furnace. After the heating and heat preservation is completed, the outer bell is replaced with a cooling bell, and the cooling bell pumps water up and sprays it onto the outside of the inner bell for cooling.

[0048] Furthermore, in step S5, the pickling solution is one of sulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid.

[0049] Furthermore, during the homogenization annealing process in step S3, one of nitrogen, hydrogen or a nitrogen-hydrogen mixture is introduced as a protective gas.

[0050] Furthermore, the wide copper plate includes the following components in percentage by mass: Cr 0.1%, Ag 0.05%, Zr 0.1%, Fe 1%, and the balance is Cu and inevitable impurities.

[0051] Furthermore, in step S7, the rolling force is 200 KN and the rolling speed is 50 m / min.

[0052] Embodiment 2: This embodiment differs from Embodiment 1 in that it includes the following steps:

[0053] S1, coiling, winding the wide copper strip on the outer surface of the sleeve;

[0054] S2, solution treatment: solution quenching the wide copper strip and making coils;

[0055] S3, annealing treatment, transferring the quenched wide copper plate to a heat treatment furnace, directly heating it up, and performing multi-stage homogenization annealing treatment;

[0056] S4, annealing and cooling;

[0057] S5, pickling: put the cooled wide copper plate into the pickling tank and soak it for 15 minutes;

[0058] S6 Neutralization washing: Put the wide copper plate treated in step S5 into a water pool and neutralize the wide copper plate with a neutralizer to avoid residual acid, and then rinse with clean water for 4 times;

[0059] S7 Finished product rolling: The wide copper plate processed in step S6 is subjected to finished product finish rolling, with a rolling deformation of 5-9%. After trimming, cleaning, stretching and bending correction, a finished wide copper plate strip is obtained.

[0060] Furthermore, the multi-stage homogenization annealing treatment in step S3 includes the following steps:

[0061] S301 first heating and temperature fixing treatment; the heating rate of the first heating and temperature fixing treatment is 70°C / h, the temperature fixing temperature of the first heating and temperature fixing treatment is 510°C, and the temperature fixing time of the first heating and temperature fixing treatment is 10h;

[0062] S302 second heating and temperature fixing treatment; the heating rate of the second heating and temperature fixing treatment is 80°C / h, the temperature fixing temperature of the second heating and temperature fixing treatment is 530°C, and the temperature fixing time of the second heating and temperature fixing treatment is 12h;

[0063] S303 is the third heating and temperature-fixing treatment; the heating rate of the third heating and temperature-fixing treatment is 30℃ / h, the temperature of the third heating and temperature-fixing treatment is 550℃, the temperature-fixing time of the third heating and temperature-fixing treatment is 50h, and the temperature of the third heating and temperature-fixing treatment is higher than the temperature of the second heating and temperature-fixing treatment.

[0064] Furthermore, the annealing and cooling in step S4 is performed by annealing in a bell-type furnace. After the heating and heat preservation is completed, the outer bell is replaced with a cooling bell, and the cooling bell pumps water up and sprays it onto the outside of the inner bell for cooling.

[0065] Furthermore, in step S5, the pickling solution is one of sulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid.

[0066] Furthermore, during the homogenization annealing process in step S3, one of nitrogen, hydrogen or a nitrogen-hydrogen mixture is introduced as a protective gas.

[0067] Furthermore, the wide copper plate includes the following components in percentage by mass: Cr 0.2%, Ag 0.06%, Zr 0.2%, Fe 3%, and the remainder is Cu and inevitable impurities.

[0068] Furthermore, in step S7, the rolling force is 220 KN and the rolling speed is 550 m / min.

[0069] Embodiment 3: This embodiment differs from Embodiment 1 in that it includes the following steps:

[0070] S1, coiling, winding the wide copper strip on the outer surface of the sleeve;

[0071] S2, solution treatment: solution quenching the wide copper strip and making coils;

[0072] S3, annealing treatment, transferring the quenched wide copper plate to a heat treatment furnace, directly heating it up, and performing multi-stage homogenization annealing treatment;

[0073] S4, annealing and cooling;

[0074] S5, pickling: put the cooled wide copper plate into the pickling tank and soak it for 15 minutes;

[0075] S6 Neutralization washing: Put the wide copper plate treated in step S5 into a water pool and neutralize the wide copper plate with a neutralizer to avoid residual acid, and then rinse with clean water for 5 times;

[0076] S7 Finished product rolling: The wide copper plate processed in step S6 is subjected to finished product finish rolling, with a rolling deformation of 9%. After trimming, cleaning, stretching and bending correction, a finished wide copper plate strip is obtained.

[0077] Furthermore, the multi-stage homogenization annealing treatment in step S3 includes the following steps:

[0078] S301 first heating and temperature fixing treatment; the heating rate of the first heating and temperature fixing treatment is 70°C / h, the temperature fixing temperature of the first heating and temperature fixing treatment is 520°C, and the temperature fixing time of the first heating and temperature fixing treatment is 10h;

[0079] S302 is the second heating and temperature fixing process; the heating rate of the second heating and temperature fixing process is 80°C / h, the temperature fixing temperature of the second heating and temperature fixing process is 540°C, and the temperature fixing time of the second heating and temperature fixing process is 12h;

[0080] S303 is the third heating and temperature-fixing treatment; the heating rate of the third heating and temperature-fixing treatment is 30℃ / h, the temperature of the third heating and temperature-fixing treatment is 560℃, the temperature-fixing time of the third heating and temperature-fixing treatment is 50h, and the temperature of the third heating and temperature-fixing treatment is higher than the temperature of the second heating and temperature-fixing treatment.

[0081] Furthermore, the annealing and cooling in step S4 is performed by annealing in a bell-type furnace. After the heating and heat preservation is completed, the outer bell is replaced with a cooling bell, and the cooling bell pumps water up and sprays it onto the outside of the inner bell for cooling.

[0082] Furthermore, in step S5, the pickling solution is one of sulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid.

[0083] Furthermore, during the homogenization annealing process in step S3, one of nitrogen, hydrogen or a nitrogen-hydrogen mixture is introduced as a protective gas.

[0084] Furthermore, the wide copper plate includes the following components in percentage by mass: Cr 0.3%, Ag 0.07%, Zr 0.3%, Fe 1-5%, and the remainder is Cu and inevitable impurities.

[0085] Furthermore, in step S7, the rolling force is 230 KN and the rolling speed is 60 m / min.

[0086] In summary, the sleeve and shape control method for maintaining a flat plate shape of a wide copper plate strip, the sleeve and shape control method for maintaining a flat plate shape of a wide copper plate strip, when the strip wraps around the sleeve, it will generate considerable compressive stress on the sleeve, causing the sleeve to have a large inward deformation, and the shallow grooves on the sleeve can evenly disperse the compressive stress to each segment of the sleeve. When the sleeve and the strip are annealed and heat treated at the same time, the heat treatment temperature will release the compressive stress on each segment of the sleeve. When the strip is separated from the sleeve, the deformation of the sleeve surface begins to rebound due to the lack of compressive stress, and the sleeve surface returns to flatness. According to this feature of the special sleeve, the strip shape is always in a relatively flat state on the sleeve, and the rolling stress of the strip surface remains consistent after rolling. After annealing and heat treatment, the rolling stress of the sleeve and the strip is released, so that the strip can fit flatly on the sleeve, thereby keeping the strip shape flat.

[0087] The sleeve and shape control method for maintaining the flat shape of the wide copper strip proposes a preparation method for high-strength and high-toughness conductive copper alloy strip based on "hot rolling → solution treatment → coiling → annealing treatment", which solves the problem that the wide copper strip produced by the traditional preparation process has high strength, high toughness (such as bending resistance) and high conductivity. In the quenching process, it can refine the grains, inhibit the precipitation of precipitated phases, and improve the residual stress. In the annealing process, it can accelerate the recrystallization process, improve the residual stress, control the behavior of the precipitated phase and reduce the annealing temperature, which has a significant positive effect on the quenching and annealing process. These effects not only improve the performance and stability of the material, but also reduce production costs and energy consumption.

Claims

1. A sleeve for maintaining a flat plate shape of a wide copper strip, comprising a sleeve (1), characterized in that: The outer surface of the sleeve (1) is provided with a plurality of long strip-shaped grooves (2), the number of the grooves (2) being greater than three and arranged in a circular array on the outer surface of the sleeve (1).

2. A method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 1, characterized in that: The following steps are involved: S1, coiling, winding the wide copper strip on the outer surface of the sleeve; S2, solution treatment: solution quenching the wide copper strip and making coils; S3, annealing treatment, transferring the quenched wide copper plate to a heat treatment furnace, directly heating it up, and performing multi-stage homogenization annealing treatment; S4, annealing and cooling; S5, pickling: put the cooled wide copper plate into the pickling tank and soak it for 15 minutes; S6 Neutralization washing: Put the wide copper plate treated in step S5 into a water pool and neutralize the wide copper plate with a neutralizer to avoid residual acid, and then rinse with clean water for 3-5 times; S7 Finished product rolling: The wide copper plate processed in step S6 is subjected to finished product finish rolling, with a rolling deformation of 5-9%. After trimming, cleaning, stretching and bending correction, a finished wide copper plate strip is obtained.

3. A method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 2, characterized in that: The multi-stage homogenization annealing treatment in step S3 includes the following steps: S301 first heating and temperature-fixing treatment; the heating rate of the first heating and temperature-fixing treatment is 70°C / h, the temperature of the first heating and temperature-fixing treatment is 500-520°C, and the temperature-fixing time of the first heating and temperature-fixing treatment is 10h; S302 second heating and temperature setting treatment; the heating rate of the second heating and temperature setting treatment is 80°C / h, the temperature setting temperature of the second heating and temperature setting treatment is 520-540°C, and the temperature setting time of the second heating and temperature setting treatment is 12h; S303 is the third heating and temperature-fixing treatment; the heating rate of the third heating and temperature-fixing treatment is 30°C / h, the temperature of the third heating and temperature-fixing treatment is 540-560°C, the temperature-fixing time of the third heating and temperature-fixing treatment is 50h, and the temperature of the third heating and temperature-fixing treatment is higher than the temperature of the second heating and temperature-fixing treatment.

4. A method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 2, characterized in that: The annealing and cooling in step S4 is performed by annealing in a bell-type furnace. After the heating and heat preservation is completed, the outer bell is replaced with a cooling bell, and the cooling bell pumps water up and sprays it onto the outside of the inner bell for cooling.

5. The method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 2, characterized in that: In step S5, the pickling solution is one of sulfuric acid, hydrochloric acid, phosphoric acid and nitric acid.

6. A method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 2, characterized in that: During the homogenization annealing treatment in step S3, one of nitrogen, hydrogen or a nitrogen-hydrogen mixed gas is introduced as a protective gas.

7. A method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 2, characterized in that: The wide copper plate comprises the following components in percentage by mass: 0.1-0.3% Cr, 0.05-0.07% Ag, 0.1-0.3% Zr, 1-5% Fe, and the remainder is Cu and inevitable impurities.

8. A method for controlling the shape of a wide copper strip to maintain a flat shape according to claim 2, characterized in that: In step S7, the rolling force is 200-230 KN, and the rolling speed is 50-60 m / min.

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