Titanium-copper alloy preform capable of preventing interlayer scratch and rolling process

Abstract

The invention discloses a titanium-copper alloy preformed part capable of preventing interlayer scratching and a rolling process, belongs to the technical field of titanium-copper alloys, and aims to solve the problem that in the existing titanium-copper alloy rolling process, the interlayer scratching phenomenon of the alloy during rolling is not treated by taking measures. And during secondary rolling and tertiary rolling, thickness adjustment of secondary rolling is not carried out according to the final required thickness of a finished product, and the scheme effect is not clear. The rolling speed is reduced, the surface of the roller is checked and lubricated, the tension is reduced, the interlayer scratch phenomenon is preprocessed, an angle grinder is used for grinding when the interlayer scratch phenomenon exists, rolling estimation is conducted on finished products with different thicknesses in the second rolling process, and the rolling precision of the finished products with different thicknesses is improved. Before finish rolling, the thickness range of a preformed piece and the thickness range of a final finished product need to be controlled to be not larger than 0.3 mm, the finished product needs to be rolled according to the negative tolerance of + 0 / -0.01 mm, the size precision of the product is guaranteed, the thickness change record of a coil stock in the rolling technology is detailed, and the rolling speed during second rolling and third rolling is high.

Description

Technical Field

[0001] The invention relates to the technical field of titanium-copper alloys, and in particular to a titanium-copper alloy preform capable of preventing interlayer scratches and a rolling process. Background Art

[0002] Titanium-copper alloy has high strength, hardness and excellent stress relaxation resistance. With the development of the information age, its demand is increasing, and it is widely used in terminals and connectors of high-end electronic equipment. At present, as electronic equipment continues to develop towards miniaturization and lightweight, connectors and other electronic and electrical components are also constantly evolving in the direction of miniaturization and lightweight. However, when the connector is thin-walled and narrow-pitch, the reduction in the cross-sectional area of ​​the connector will cause a decrease in contact pressure and conduction capacity, which requires the material to have higher mechanical properties and electrical conductivity. At the same time, based on the complexity of component shapes and the need to improve reliability in assembly, the requirements for material bending processing performance are getting higher and higher. In addition, with the complexity of component shapes and the diversification of functions, the materials used not only pursue excellent mechanical strength and conductivity, but also put forward new requirements for application characteristics such as welding, heat resistance and electroplating.

[0003] A copper-gold alloy rolling process with authorization announcement number CN109777993B, the steps of which include: melting gold and copper into alloy billets in the required proportion, annealing and heat-insulating to obtain thick ingots, rolling from the length direction with a deformation of 5 to 50% to obtain thick rolled billets, annealing and heat-insulating to obtain thin ingots, and then rolling from the length direction with a deformation of 5 to 50% to obtain thin rolled billets, repeating annealing and rolling until the required thickness is reached, and a copper-gold alloy target with a purity of 99.5wt% can be manufactured, which will not crack at a rolling ratio of 20 to 90%, and has a loss of less than 0.1%. The alloy produced by this process does not take measures to deal with the interlayer scratch phenomenon during rolling, and the thickness of the secondary rolling is not adjusted according to the final required finished product thickness during the secondary rolling and tertiary rolling, and the effect of the scheme is unclear.

[0004] To solve the above problems, a titanium-copper alloy preform and a rolling process for preventing interlayer scratching are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a titanium-copper alloy preform and rolling process that are resistant to interlayer scratching, which solves the problem that the alloy in the existing titanium-copper alloy rolling process in the background technology does not take measures to deal with the interlayer scratching phenomenon during rolling, and the thickness of the secondary rolling and tertiary rolling is not adjusted according to the final required finished product thickness, resulting in unclear effect of the solution.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a titanium-copper alloy preform that is resistant to interlayer scratches, which comprises the following components by mass percentage: Ti: 30%~40%, Cu: 30%~40%, Fe: 10%~20%, Cr: 0.5%~1.0%, and the total amount of impurities is <0.5%.

[0007] Furthermore, the first rolling requires rolling a billet with an initial thickness of 2.5 mm, and rolling to 0.27 mm requires twelve passes, with the tension gradually decreasing and the rolling speed gradually increasing.

[0008] Furthermore, the billet with a thickness of 0.27 mm needs to select different numbers of passes and rolling forces according to the final rolling thickness, and the rolling speed is adjusted at the same time. The coil with a final required thickness of 0.1 mm needs to be rolled from 0.27 mm to 0.14 mm during the second rolling, and then finish rolled. The coil with a final required thickness of 0.13 mm needs to be rolled from 0.27 mm to 0.16 mm during the second rolling, and then finish rolled. The thickness range of the secondary rolling and the final product does not exceed 0.3 mm.

[0009] Furthermore, the coil with an initial thickness of 0.27 mm is rolled, and four passes are required to roll it to 0.14 mm. The initial rolling force is 1400 KN, which decreases by 100 KN, and the initial rolling speed is 150 m / min, which gradually increases by 40 m / min.

[0010] Furthermore, in the third rolling, the 0.14 mm coil is rolled to 0.1 mm in two passes, the rolling force is 700 KN, and the initial rolling speed is 160 m / min.

[0011] Furthermore, the coil with an initial thickness of 0.27 mm is rolled, and two passes are required to roll it to 0.16 mm. The initial rolling force is 1400 KN, which is reduced by a difference of 100 KN, and the rolling speed is maintained at 200 m / min.

[0012] Furthermore, in the third rolling, the 0.16 mm coil is rolled to 0.13 mm in two passes, the rolling force is 800 KN, and the rolling speed is 150 m / min.

[0013] Furthermore, the rolling speed during the second and third rolling is relatively fast, and basically increases as the thickness of the coil decreases. The finished product is rolled according to a negative tolerance of +0 / -0.01mm, and thickness gauges are set before and after the rolling mill to measure the rolling thickness in real time.

[0014] Another technical solution proposed by the present invention is to provide a rolling process for a titanium-copper alloy preform that is resistant to interlayer scratching, comprising the following steps: S1: Hot rolling: After hot rolling, the titanium-copper alloy ingot presents a state in which recrystallization and deformation structures coexist, forming a forged rectangular flat ingot; S2: Solid solution: After forging, the rectangular flat ingot is subjected to solid solution treatment to form a solid solution coil; S3: Milling: Milling of solid solution coils can remove the surface and edge oxide layer and segregation products; S4: Annealing: The coiled material after milling is annealed and softened; S5: Rolling: After annealing and softening, the thick material can be transferred to the four-roll mill for rolling. The rolling process is divided into three times; S6: Cleaning: After each rolling, the coil needs to be repeatedly pickled and degreased, trimmed and cracked, solution softened and brushed to form a thin finished product.

[0015] Further, the rolling comprises the following steps: S51: Preparation: Place the blank at the entrance of the four-high rolling mill to ensure that the blank is flat and has no scratches. At the same time, check whether all parts of the rolling mill are normal, such as rollers, bearings, transmission system, etc.; S52: adjusting parameters: feeding the blank into the four-roller rolling mill, and adjusting parameters such as the spacing of the rolls, the rolling speed and the rolling force according to the requirements of the rolling process; S53: Finished product inspection: Check the size and surface quality of the rolled material to ensure that it meets the product standards. If it does not meet the standards, the surface needs to be angle-grinded. S54: Roller cooling: coolant is delivered to wait for the rolls to cool before the next rolling.

[0016] Furthermore, the finished product after rolling may have interlayer scratches, which can be treated in the following ways: a: Before rolling, check to ensure that the surface of the billet is smooth without obvious scratches and stains; b: Appropriately reduce the rolling speed and adjust the rolling speed to less than 15m / min to reduce the heat generated by friction and reduce the possibility of scratches; c: Check the roller surface regularly. If scratches are found, replace the roller in time. d: Lubricate the rollers to reduce friction and the possibility of scratches; e: Reduce the first pass tension to below 29KN.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a titanium-copper alloy preform and rolling process for preventing interlayer scratches. The interlayer scratches are pre-processed by reducing the rolling speed, checking and lubricating the roller surface, and reducing the tension. If there are already interlayer scratches, an angle grinder is used to grind them, which solves the problem that the alloy in the existing titanium-copper alloy rolling process does not take measures to process the interlayer scratches during rolling.

[0018] 2. The present invention provides a titanium-copper alloy preform and rolling process for preventing interlayer scratches. In the second rolling, the rolling of finished products with different thicknesses is estimated. Before finishing rolling, the thickness of the preform and the thickness of the final finished product must be controlled to be within 0.3 mm, and the finished product needs to be rolled according to a negative tolerance of +0 / -0.01 mm to ensure the dimensional accuracy of the product. The thickness change record of the coil in this rolling process is detailed. The rolling speed during the second and third rollings is fast and basically increases as the thickness of the coil decreases. Rolling according to this process can ensure the effect of the finished product, which solves the problem that the thickness of the second rolling is not adjusted according to the final required thickness of the finished product during the second and third rollings in the existing titanium-copper alloy rolling process, and the effect of the solution is unclear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the scratch phenomenon between the layers of the coil material of the present invention; Figure 2 It is a schematic diagram of the process of the present invention; Figure 3 It is a schematic diagram of the process parameters of the first rolling of the present invention; Figure 4 The process parameters of the second rolling of the present invention are shown in FIG. Figure 1 ; Figure 5 The process parameters of the second rolling of the present invention are shown in FIG. Figure 2 ; Figure 6 The process parameters of the third rolling of the present invention are shown in FIG. Figure 1 ; Figure 7 The process parameters of the third rolling of the present invention are shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to solve the problem that the alloy in the existing titanium-copper alloy rolling process does not take measures to deal with the interlayer scratch phenomenon during rolling, and the thickness of the secondary rolling is not adjusted according to the final required finished product thickness during the secondary rolling and the tertiary rolling, there are technical problems such as unclear scheme effects, such as Figure 1-Figure 6 As shown, the following preferred technical solutions are provided: A titanium-copper alloy preform capable of preventing interlayer scratches comprises the following components by mass percentage: Ti: 30%-40%, Cu: 30%-40%, Fe: 10%-20%, Cr: 0.5%-1.0%, and the total amount of impurities is less than 0.5%.

[0022] Titanium is the main strengthening element in the alloy, which can refine the alloy's grains and improve its heat resistance and creep resistance. Copper is the main conductive element in the alloy, which improves the alloy's conductivity and thermal stability. Iron is the main component in the alloy, which improves the alloy's wear resistance and corrosion resistance. Chromium is the main corrosion-resistant element in the alloy, which improves the alloy's high-temperature stability.

[0023] The first rolling process requires rolling the blank with an initial thickness of 2.5 mm. It takes twelve passes to roll the blank to 0.27 mm. The tension gradually decreases and the rolling speed gradually increases. The specific process parameters are as follows: Figure 3 .

[0024] The billet with a thickness of 0.27mm needs to select different numbers of passes and rolling forces according to the final rolling thickness, and the rolling speed should be adjusted at the same time. The coil with a final thickness of 0.1mm needs to be rolled from 0.27mm to 0.14mm during the second rolling, and then finish rolled. The coil with a final thickness of 0.13mm needs to be rolled from 0.27mm to 0.16mm during the second rolling, and then finish rolled. The thickness range of the secondary rolling and the final product does not exceed 0.3mm.

[0025] The initial thickness of the coil is 0.27mm. It takes four passes to roll to 0.14mm. The initial rolling force is 1400KN, which decreases by 100KN. The initial rolling speed is 150m / min, which increases by 40m / min. The specific process parameters are as follows: Figure 4 .

[0026] In the third rolling, the 0.14mm coil is rolled to 0.1mm in two passes, the rolling force is 700KN, the initial rolling speed is 160m / min, and the specific process parameters are as follows: Figure 5 .

[0027] The initial thickness of the coil is 0.27mm. It takes two passes to roll it to 0.16mm. The initial rolling force is 1400KN, which is reduced by 100KN. The rolling speed is maintained at 200m / min. The specific process parameters are as follows: Figure 6 .

[0028] In the third rolling, the 0.16mm coil is rolled to 0.13mm in two passes, with a rolling force of 800KN and a rolling speed of 150m / min. The specific process parameters are as follows: Figure 7 .

[0029] The rolling speed during the second and third rolling is relatively fast, and basically increases as the thickness of the coil decreases. The finished product is rolled according to the negative tolerance of +0 / -0.01mm. Thickness gauges are set before and after the rolling mill to measure the rolling thickness in real time. As the thickness of the coil decreases, the rolling force will also decrease accordingly. Properly increasing the rolling speed can improve the rolling efficiency and shorten the production cycle. By measuring the rolling thickness in real time, the thickness control during the rolling process can be ensured, quality problems caused by thickness fluctuations can be avoided, and scratches that may occur during the rolling process can be discovered and avoided in time. At the same time, rolling according to the negative tolerance of +0 / -0.01mm can ensure the dimensional accuracy of the product, effectively refine the grains, and improve the performance of the material.

[0030] In order to further better explain the above embodiment, the present invention also provides an implementation scheme, a titanium-copper alloy preform rolling process for preventing interlayer scratches, comprising the following steps: S1: Hot rolling: After hot rolling, the titanium-copper alloy ingot presents a state in which recrystallization and deformation structures coexist, forming a forged rectangular flat ingot; S2: Solid solution: After forging, the rectangular flat ingot is subjected to solid solution treatment to form a solid solution coil. After hot rolling and coiling, the strength and hardness of the billet are increased to a certain extent; S3: Milling: Milling of solid solution coils can remove the surface and edge oxide layer and segregation products; S4: Annealing: The coiled material after milling is annealed and softened; S5: Rolling: After annealing and softening, the thick material can be transferred to the four-roll mill for rolling. The rolling process is divided into three times; S6: Cleaning: After each rolling, the coil needs to be repeatedly pickled and degreased, trimmed and cracked, solution softened and brushed to form a thin finished product.

[0031] Rolling includes the following steps: S51: Preparation: Place the blank at the entrance of the four-high rolling mill to ensure that the blank is flat and has no scratches. At the same time, check whether all parts of the rolling mill are normal, such as rollers, bearings, transmission system, etc.; S52: adjusting parameters: feeding the blank into the four-roller rolling mill, and adjusting parameters such as the spacing of the rolls, the rolling speed and the rolling force according to the requirements of the rolling process; S53: Finished product inspection: Check the size and surface quality of the rolled material to ensure that it meets the product standards. If it does not meet the standards, the surface needs to be angle-grinded. S54: Roller cooling: coolant is delivered to wait for the rolls to cool before the next rolling.

[0032] The finished product after rolling may have interlayer scratches, which can be dealt with in the following ways: a: Before rolling, check to ensure that the surface of the billet is smooth without obvious scratches and stains; b: Appropriately reduce the rolling speed and adjust the rolling speed to less than 15m / min to reduce the heat generated by friction and reduce the possibility of scratches; c: Check the roller surface regularly. If scratches are found, replace the roller in time. d: Lubricate the rollers to reduce friction and the possibility of scratches; e: Reduce the first pass tension to below 29KN.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A titanium-copper alloy preform for preventing interlayer scratching, characterized in that: The titanium-copper alloy preform comprises the following components by mass percentage: Ti: 30%-40%, Cu: 30%-40%, Fe: 10%-20%, Cr: 0.5%-1.0%, and the total amount of impurities is less than 0.5%. The titanium-copper alloy ingot formed according to this ratio is processed as follows: S1: Hot rolling: After hot rolling, the titanium-copper alloy ingot presents a state in which recrystallization and deformation structures coexist, forming a forged rectangular flat ingot; S2: Solid solution: After forging, the rectangular flat ingot is subjected to solid solution treatment to form a solid solution coil; S3: Milling: Milling of solid solution coils can remove the surface and edge oxide layer and segregation products; S4: Annealing: The coiled material after milling is annealed and softened; S5: Rolling: After annealing and softening, the thick material can be transferred to the four-roll mill for rolling. The rolling process is divided into three times; S6: Cleaning: After each rolling, the coil needs to be repeatedly pickled and degreased, trimmed and cracked, solution softened and brushed to form a thin finished product.

2. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 1, characterized in that: The rolling process comprises the following steps: S51: Preparation: Place the blank at the entrance of the four-roll mill, ensure that the blank is flat and has no scratches, and at the same time, check whether all parts of the mill are normal; S52: adjusting parameters: feeding the blank into the four-roll rolling mill, and adjusting the roller spacing, rolling speed and rolling force parameters according to the requirements of the rolling process; S53: Finished product inspection: Check the size and surface quality of the rolled material to ensure that it meets the product standards. If it does not meet the standards, the surface needs to be angle-grinded. S54: Roller cooling: coolant is delivered to wait for the rolls to cool before the next rolling.

3. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 2, characterized in that: The finished product after rolling may have interlayer scratches, which can be treated in the following ways: a: Before rolling, check to ensure that the surface of the billet is smooth without obvious scratches and stains; b: Appropriately reduce the rolling speed and adjust the rolling speed to less than 15m / min to reduce the heat generated by friction and reduce the possibility of scratches; c: Check the roller surface regularly. If scratches are found, replace the roller in time. d: Lubricate the rollers to reduce friction and the possibility of scratches; e: Reduce the first pass tension to below 29KN.

4. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 3, characterized in that: The first rolling process requires rolling a billet having an initial thickness of 2.5 mm. Rolling to 0.27 mm requires twelve passes, with the tension gradually decreasing and the rolling speed gradually increasing.

5. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 4, characterized in that: The billet with a thickness of 0.27 mm needs to select different numbers of passes and rolling forces according to the final rolling thickness, and the rolling speed needs to be adjusted at the same time. The coil with a final required thickness of 0.1 mm needs to be rolled from 0.27 mm to 0.14 mm during the second rolling, and then finish rolled. The coil with a final required thickness of 0.13 mm needs to be rolled from 0.27 mm to 0.16 mm during the second rolling, and then finish rolled. The thickness range of the secondary rolling and the final product does not exceed 0.3 mm.

6. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 5, characterized in that: The coil material with an initial thickness of 0.27 mm is rolled, and four passes are required to roll it to 0.14 mm. The initial rolling force is 1400 KN, which decreases in steps of 100 KN, and the initial rolling speed is 150 m / min, which gradually increases in steps of 40 m / min.

7. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 6, characterized in that: In the third rolling, the 0.14 mm coil needs to be rolled to 0.1 mm in two passes, the rolling force is 700 KN, and the initial rolling speed is 160 m / min.

8. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 5, characterized in that: The coil material with an initial thickness of 0.27 mm is rolled, and two passes are required to roll it to 0.16 mm. The initial rolling force is 1400 KN, which is reduced by 100 KN, and the rolling speed is maintained at 200 m / min.

9. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 8, characterized in that: In the third rolling, the 0.16 mm coil is rolled to 0.13 mm in two passes, the rolling force is 800 KN, and the rolling speed is 150 m / min.

10. A rolling process for a titanium-copper alloy preform with anti-interlayer scratching as claimed in claim 9, characterized in that: The rolling speed is increased during the second and third rolling, and basically increases as the thickness of the coil decreases. The finished product is rolled according to the negative tolerance of +0 / -0.01mm. Thickness gauges are set before and after the rolling mill to measure the rolling thickness in real time.

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