A method for preparing a TA4 titanium alloy foil for an OLED flexible screen metal mask plate

Abstract

This invention discloses a method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask plates, comprising the following steps: S1, initial cold rolling; S2, initial cleaning; S3, initial annealing; S4, initial wire drawing: wire drawing is performed on the upper surface of the cold-rolled coil after the first intermediate annealing, and a first straight line pattern is formed on one side of the cold-rolled coil after the first intermediate annealing; S5, secondary cold rolling; S6, secondary cleaning; S7, secondary annealing; S8, secondary wire drawing: wire drawing is performed on the upper surface of the cold-rolled coil after the second intermediate annealing, and a first wave pattern is formed on one side of the cold-rolled coil after the second intermediate annealing, resulting in a second-drawn cold-rolled coil; S9, finish rolling; S10, third cleaning; S11, third annealing; S12, tension leveling. Compared with the prior art, the foil coil material prepared by this invention has uniform internal stress and a surface roughness of Ra0.1um.

Description

Technical Field

[0001] This invention relates to the field of fine metal mask technology, and in particular to a method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask. Background Technology

[0002] Fine Metal Mask (FMM) is a consumable core component in the OLED evaporation process. It is mainly used to deposit RGB organic materials and form pixels during OLED production. It accurately and precisely deposits organic materials where needed, thereby improving the resolution and yield of the product.

[0003] There are many materials used for metal photomasks, and TA4 is one of them. TA4 is pure titanium, which has higher mechanical strength compared to TA1 / TA2, etc. Therefore, the production and processing of TA4 titanium alloy foil is particularly difficult. Considering its application in metal photomasks, high requirements are placed on the material's shape, surface roughness, and internal stress. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask, wherein the prepared foil roll material has uniform internal stress and a surface roughness of Ra0.1um.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask, comprising the following steps:

[0006] S1. First cold rolling: The titanium alloy strip raw material is rolled in the first rolling pass. The thickness of the titanium alloy strip is 3.0-3.5mm, the deformation per pass is 20-30%, and the final rolling thickness is 1.0-1.5mm to obtain the first cold-rolled coil.

[0007] S2. Initial cleaning: Clean the surface of the first cold-rolled strip;

[0008] S3. First annealing: The first cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 700-750℃ and the holding time is 6-8h to obtain the first intermediate annealed cold-rolled coil.

[0009] S4. Initial drawing process: The upper surface of the cold-rolled coil after the first intermediate annealing is drawn, and the first straight line pattern is formed on one side of the cold-rolled coil after the first intermediate annealing, thus obtaining the first-drawn cold-rolled coil.

[0010] S5. Secondary cold rolling: The first-drawn cold-rolled coil is rolled in a second pass with a deformation of 12-18% per pass and a final thickness of 0.3-0.5 mm to obtain the second cold-rolled coil.

[0011] S6. Secondary cleaning: Clean the surface of the second cold-rolled strip;

[0012] S7. Secondary annealing: The second cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 650-680℃ and the holding time is 5-6h to obtain the second intermediate annealed cold-rolled coil.

[0013] S8. Secondary wire drawing treatment: Wire drawing treatment is performed on the upper surface of the cold-rolled coil after the second intermediate annealing treatment. The first wave pattern is formed by brushing one side of the cold-rolled coil after the second intermediate annealing treatment to obtain the secondary wire drawing cold-rolled coil.

[0014] S9. Finishing: The second-drawn cold-rolled strip is fed into a 20-roll mill for finishing, with a final rolling thickness of 0.08-0.12mm, to obtain the third cold-rolled strip;

[0015] S10, Third cleaning: Surface cleaning of the third cold-rolled strip;

[0016] S11, Third Annealing: The third cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 700-750℃ and the holding time is 7-9h to obtain the third intermediate annealed cold-rolled coil.

[0017] S12. Stretch straightening: The cold-rolled coil that has undergone the third intermediate annealing process is fed into a multi-roll straightener for stretch straightening to obtain foil coil.

[0018] As a further description of the above technical solution:

[0019] In step S4, after forming a first straight line pattern on one side of the cold-rolled coil after the first intermediate annealing treatment, a wire drawing process is performed on the other side of the cold-rolled coil after the first intermediate annealing treatment to form a second straight line pattern.

[0020] As a further description of the above technical solution:

[0021] The first and second straight lines are arranged in a staggered manner.

[0022] As a further description of the above technical solution:

[0023] In step S8, after the first wave pattern is formed by brushing one side of the cold-rolled coil after the second intermediate annealing treatment, the other side of the cold-rolled coil after the second intermediate annealing treatment is drawn to form the second wave pattern.

[0024] As a further description of the above technical solution:

[0025] In step S9, the surface roughness of the rolls of the 20-roll mill is Ra0.05um.

[0026] As a further description of the above technical solution:

[0027] In step S9, before each finishing milling operation, the surface roughness of the rolls is inspected and the roll surface is polished until the surface roughness of the rolls reaches Ra0.05um.

[0028] As a further description of the above technical solution:

[0029] In step S12, the multi-roll straightener includes 29 straightening rolls.

[0030] As a further description of the above technical solution:

[0031] In step S4, after the first intermediate annealing cold-rolled coil is drawn, inert gas is sprayed through a jet pipe to remove residual metal shavings from the surface.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] 1. In this invention, during the processing of foil strip coils, a first wire drawing process is performed between the first and second cold rolling, and a second wire drawing process is performed between the second cold rolling and the finishing rolling. The wire drawing process removes the surface material of the coil. Unlike ordinary cold rolling, which simply deforms the coil by squeezing and stretching the surface, the wire-drawn coil not only improves rolling deformation efficiency but also effectively squeezes and stretches the original inner layer material, effectively improving the surface quality of the coil and ensuring uniform internal stress.

[0034] 2. In this invention, the two drawing processes create different textures. During the first drawing process, the strip is thicker, and by processing straight lines, the amount of surface material removed from the strip is effectively controlled, facilitating subsequent cold rolling deformation and ensuring uniform internal stress. During the second drawing process, the strip is thinner, and a brush is used to create a wavy texture, reducing the amount of surface material removed. Furthermore, the wavy texture is non-directional compared to straight lines, improving the surface quality of the strip. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1This is a schematic diagram of the structure of the cold-rolled coil after the first intermediate annealing treatment in step S4 of a method for preparing TA4 titanium alloy foil for a flexible OLED screen metal mask.

[0037] Figure 2 This is a schematic diagram of the structure of the cold-rolled coil after the second intermediate annealing treatment in step S8 of a method for preparing TA4 titanium alloy foil for a flexible OLED screen metal mask.

[0038] Legend:

[0039] 1. First straight line pattern; 2. First wavy pattern; 3. Second straight line pattern. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0044] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Please see Figure 1-2 This invention provides a technical solution: a method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask, comprising the following steps:

[0046] S1. First cold rolling: The titanium alloy strip raw material is rolled in the first rolling pass. The thickness of the titanium alloy strip is 3.0-3.5mm, the deformation per pass is 20-30%, and the final rolling thickness is 1.0-1.5mm to obtain the first cold-rolled coil.

[0047] S2. Initial cleaning: Clean the surface of the first cold-rolled strip;

[0048] S3. First annealing: The first cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 700-750℃ and the holding time is 6-8h to obtain the first intermediate annealed cold-rolled coil.

[0049] S4. Initial drawing process: The upper surface of the cold-rolled coil after the first intermediate annealing is drawn, and the first straight line pattern 1 is formed on one side of the cold-rolled coil after the first intermediate annealing, thus obtaining the first-drawn cold-rolled coil.

[0050] S5. Secondary cold rolling: The first-drawn cold-rolled coil is rolled in a second pass with a deformation of 12-18% per pass and a final thickness of 0.3-0.5 mm to obtain the second cold-rolled coil.

[0051] S6. Secondary cleaning: Clean the surface of the second cold-rolled strip;

[0052] S7. Secondary annealing: The second cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 650-680℃ and the holding time is 5-6h to obtain the second intermediate annealed cold-rolled coil.

[0053] S8. Secondary wire drawing treatment: Wire drawing treatment is performed on the upper surface of the cold-rolled coil after the second intermediate annealing treatment. The first wave pattern 2 is formed by brushing one side of the cold-rolled coil after the second intermediate annealing treatment to obtain the secondary wire drawing cold-rolled coil.

[0054] S9. Finishing: The second-drawn cold-rolled strip is fed into a 20-roll mill for finishing, with a final rolling thickness of 0.08-0.12mm, to obtain the third cold-rolled strip;

[0055] S10, Third cleaning: Surface cleaning of the third cold-rolled strip;

[0056] S11, Third Annealing: The third cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 700-750℃ and the holding time is 7-9h to obtain the third intermediate annealed cold-rolled coil.

[0057] S12. Stretch straightening: The cold-rolled coil that has undergone the third intermediate annealing process is fed into a multi-roll straightener for stretch straightening to obtain foil coil.

[0058] In step S4, after forming the first straight line pattern 1 on one side of the cold-rolled strip after the first intermediate annealing treatment, a wire drawing process is performed on the other side of the cold-rolled strip after the first intermediate annealing treatment to form the second straight line pattern 3. Both the upper and lower surfaces of the strip are wire drawn, which further facilitates improved rolling deformation efficiency and ensures uniform internal stress in the cold-rolled strip. Furthermore, the first straight line pattern 1 and the second straight line pattern 3 are staggered to ensure uniform strip thickness and internal stress during rolling.

[0059] In step S8, after the first wavy texture 2 is formed by brushing one side of the cold-rolled coil after the second intermediate annealing, the other side of the cold-rolled coil after the second intermediate annealing is subjected to a wire drawing process to form a second wavy texture. Both the upper and lower surfaces of the coil are subjected to wire drawing to improve the surface quality of the coil.

[0060] In step S9, the surface roughness of the rolls in the 20-roll mill is Ra0.05um. To control the surface roughness, during the 20-roll finishing mill, the rolls used need to be ground to a bright surface with a roughness of approximately Ra0.05um, ensuring that the surface roughness of the foil strip is approximately Ra0.1um.

[0061] In step S9, before each finishing rolling operation, the surface roughness of the rolls is inspected and the roll surface is polished until the surface roughness reaches Ra0.05um, which fully ensures the surface roughness of the foil roll and guarantees the processing quality.

[0062] In step S12, the multi-roll straightener includes 29 straightening rolls. To ensure the straightening quality of the foil roll, a multi-roll straightener with up to 29 straightening rolls is used for straightening to ensure uniform internal stress in the material.

[0063] In step S4, after the cold-rolled strip undergoes the first intermediate annealing process and is drawn, inert gas is sprayed through a jet pipe to remove residual metal shavings from the surface. Argon gas can be used as the inert gas for effective surface cleaning.

[0064] Working principle: The production process of TA4 titanium alloy foil is as follows: cold rolling - cleaning - annealing - wire drawing - cold rolling - cleaning - annealing - wire drawing - 20-roll precision rolling - cleaning - annealing - tension leveling.

[0065] In the processing of foil strip coils, a first drawing process is performed between the first and second cold rolling, and a second drawing process is performed between the second cold rolling and the finishing rolling. The drawing process removes the surface material of the coil. Unlike ordinary cold rolling, which simply deforms the coil by squeezing and stretching the surface, the drawing process not only improves rolling deformation efficiency but also effectively squeezes and stretches the original inner layer material, effectively improving the surface quality of the coil and ensuring uniform internal stress. The textures created by the two drawing processes are different. In the first drawing process, the coil is thicker, and a straight-line texture effectively controls the amount of surface material removed, facilitating subsequent cold rolling deformation and ensuring uniform internal stress. In the second drawing process, the coil is thinner, and a brush is used to create a wavy texture, reducing the amount of surface material removed. Furthermore, the wavy texture is non-directional compared to a straight-line texture, further improving the surface quality of the coil.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing TA4 titanium alloy foil for a metal mask plate of an OLED flexible screen, characterized in that, Includes the following steps: S1. First cold rolling: The titanium alloy strip raw material is rolled in the first rolling pass. The thickness of the titanium alloy strip is 3.0-3.5mm, the deformation per pass is 20-30%, and the final rolling thickness is 1.0-1.5mm to obtain the first cold-rolled coil. S2. Initial cleaning: Clean the surface of the first cold-rolled strip; S3. First annealing: The first cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 700-750℃ and the holding time is 6-8h to obtain the first intermediate annealed cold-rolled coil. S4. Initial drawing process: The upper surface of the cold-rolled coil after the first intermediate annealing is drawn, and the first straight line pattern (1) is formed on one side surface of the cold-rolled coil after the first intermediate annealing, thus obtaining the cold-rolled coil after the first drawing process. S5. Secondary cold rolling: The first-drawn cold-rolled coil is rolled in a second pass with a deformation of 12-18% per pass and a final thickness of 0.3-0.5 mm to obtain the second cold-rolled coil. S6. Secondary cleaning: Clean the surface of the second cold-rolled strip; S7. Secondary annealing: The second cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 650-680℃ and the holding time is 5-6h to obtain the second intermediate annealed cold-rolled coil. S8. Secondary wire drawing treatment: Wire drawing treatment is performed on the upper surface of the cold rolled coil after the second intermediate annealing treatment. The first wave pattern (2) is formed by brushing one side of the cold rolled coil after the second intermediate annealing treatment to obtain the secondary wire drawing cold rolled coil. S9. Finishing: The second-drawn cold-rolled strip is fed into a 20-roll mill for finishing, with a final rolling thickness of 0.08-0.12mm, to obtain the third cold-rolled strip; S10, Third cleaning: Surface cleaning of the third cold-rolled strip; S11, Third Annealing: The third cold-rolled coil is fed into a continuous annealing furnace for online annealing treatment. The annealing temperature is 700-750℃ and the holding time is 7-9h to obtain the third intermediate annealed cold-rolled coil. S12. Stretch straightening: The cold-rolled coil that has undergone the third intermediate annealing process is fed into a multi-roll straightener for stretch straightening to obtain foil coil.

2. The method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask according to claim 1, characterized in that, In step S4, after forming a first straight line pattern (1) on one side of the cold-rolled coil after the first intermediate annealing treatment, a wire drawing process is performed on the other side of the cold-rolled coil after the first intermediate annealing treatment to form a second straight line pattern (3).

3. The method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask plate according to claim 2, wherein the first straight line pattern (1) and the second straight line pattern (3) are staggered.

4. According to claim 1, in step S8, after the first wave pattern (2) is formed by brushing one side of the cold-rolled coil after the second intermediate annealing treatment, the other side of the cold-rolled coil after the second intermediate annealing treatment is wire-drawn to form the second wave pattern.

5. In the method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask according to claim 1, in step S9, the surface roughness of the rolls of the twenty-roll mill is Ra0.05um.

6. In the method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask according to claim 5, in step S9, before each finishing rolling of the twenty-roll mill, the surface roughness of the rolls is detected and the roll surface is polished until the surface roughness of the rolls reaches Ra0.05um.

7. The method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask according to claim 1, wherein in step S12, the multi-roller straightener includes 29 straightening rollers.

8. The method for preparing TA4 titanium alloy foil for OLED flexible screen metal mask plate according to claim 1, in step S4, after the first intermediate annealing cold rolled strip is drawn, inert gas is sprayed out through a jet pipe to remove residual metal chips on the surface.

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