A method for preparing titanium alloy strip

Abstract

The present application discloses a method for preparing a titanium alloy strip, which relates to the field of harmonica processing and can, to a certain extent, improve the service life of the harmonica reeds produced. The method comprises: obtaining a titanium alloy coil with a thickness of 0.5mm to 0.7mm and an elongation of 30% or greater, the titanium alloy coil having a tensile strength of 500MPa or greater and a yield strength of 450MPa to 550MPa; subjecting the titanium alloy coil to 15 to 20 cold rolling steps to obtain a semi-finished titanium strip with a periodically variable thickness of 0.1mm to 0.4mm; the titanium alloy coil is a titanium-iron-copper alloy with an iron content of 1% to 1.1% and a copper content of 1% to 1.1%; cleaning the surface of the semi-finished titanium strip of grease remaining after rolling; annealing the semi-finished titanium strip in a titanium coil high vacuum furnace with a vacuum of 5Pa or less; and cleaning the furnace dust from the surface of the annealed semi-finished titanium strip.

Description

Technical Field

[0001] This application relates to the field of harmonica manufacturing, and more particularly to a method for preparing titanium alloy strip. Background Technology

[0002] The harmonica produces sound through the vibration of its internal reeds, making the reeds the most important component. The sound is produced by the player inhaling and exhaling, causing the reeds to vibrate, which in turn vibrates the air column. Traditional harmonica reeds are typically made of brass. Brass reeds are relatively easy to manufacture, and their high ductility and flexibility produce a deep, resonant tone.

[0003] In existing technologies, harmonica reeds made of brass are prone to breakage after prolonged vibration. These broken reeds can easily be inhaled into the trachea by the player, potentially causing life-threatening situations. Furthermore, brass reeds have poor corrosion resistance, while the human oral cavity is a weakly acidic environment with a pH of 6.6–7.1. After prolonged use, the reeds will corrode and develop verdigris, leading to inaccurate pitch during playing. Summary of the Invention

[0004] This application provides a method for preparing titanium alloy strip, which solves the problem of pitch inaccuracy caused by the formation of verdigris during long-term use of brass harmonica reeds in the prior art. At the same time, it reduces the probability of breakage due to the poor yield strength of brass harmonica reeds, thereby improving the service life of harmonica reeds.

[0005] This application provides a method for preparing titanium alloy strip for harmonica reeds, the method comprising:

[0006] A titanium alloy coil with a thickness of 0.5 mm to 0.7 mm and an elongation of ≥30% is obtained. The titanium alloy coil has a tensile strength of ≥500 MPa and a yield strength of 450 MPa to 550 MPa. The titanium alloy coil is then subjected to 15 to 20 cold rolling passes to obtain a semi-finished titanium strip with a periodically varying thickness of 0.1 mm to 0.4 mm. The titanium alloy coil is a titanium-iron-copper alloy, wherein the iron content is 1% to 1.1% and the copper content is 1% to 1.1%.

[0007] Clean the surface of the semi-finished titanium strip to remove residual grease after rolling;

[0008] The semi-finished titanium strip is placed in a high-vacuum furnace with a vacuum degree ≤5Pa for annealing.

[0009] Clean the furnace ash from the surface of the semi-finished titanium strip after annealing.

[0010] In one possible implementation, the step of cold rolling the titanium alloy coil through 15 to 20 passes includes:

[0011] The titanium alloy coil is rolled through a 20-roll precision rolling mill to produce a semi-finished titanium strip with a surface roughness ≤0.2μm and a thickness of 0.1mm to 0.4mm with periodic varying thickness. The thickness error of the semi-finished titanium strip is ±0.001mm.

[0012] In one possible implementation, the step of cold rolling the titanium alloy coil through 15 to 20 passes includes:

[0013] The deformation of titanium alloy coils after the first cold rolling is ≤8%, and the deformation of titanium alloy coils after the last cold rolling is ≤6%.

[0014] In one possible implementation, rolling the titanium alloy coil using a 20-roll precision mill includes:

[0015] The rolling tension of the 20-roll precision rolling mill is 60 N / mm. 2 ~100N / mm 2 The rolling speed is ≤40m / min; the titanium alloy coil is dynamically rolled with varying thickness by coordinating the horizontal rolling speed and the vertical rolling speed towards the titanium alloy coil using a 20-roll precision rolling mill.

[0016] In one possible implementation, the rolling of the titanium alloy coil using a 20-roll precision rolling mill further includes:

[0017] The thickness of the rolled titanium alloy coil is measured in real time using a thickness gauge. The error between the measured thickness and the preset thickness is calculated. Based on the calculated error, the rolling speed of the 20-roll precision mill in the horizontal direction or the rolling speed in the vertical direction toward the titanium alloy coil is adjusted.

[0018] In one possible implementation, the periodically varying thickness semi-finished titanium strip includes thick and thin regions arranged alternately; wherein the thickness of the thick region is 0.3 mm to 0.4 mm, the thickness of the thin region is 0.1 mm to 0.2 mm, and the transition length between the thick and thin regions is 50 mm to 100 mm.

[0019] In one possible implementation, the method further includes:

[0020] After cleaning the surface of the semi-finished titanium strip to remove residual grease from the rolling process, the cleaned semi-finished titanium alloy strip is loosely coiled using a slitting machine, with an applied coiling tension ≤25N / mm. 2 .

[0021] In one possible implementation, the step of annealing the semi-finished titanium strip in a high-vacuum furnace with a vacuum degree ≤ 5 Pa includes:

[0022] The annealing temperature of the titanium coil high vacuum furnace is 640℃~680℃.

[0023] In one possible implementation, the cleaning of residual grease on the surface of the semi-finished titanium strip after rolling includes:

[0024] The semi-finished titanium strip moves horizontally at a speed of 5m / min to 10m / min and passes through a degreasing and cleaning unit. The surface of the semi-finished titanium strip is cleaned of residual grease after rolling by a first cleaning solution, which is also an alkaline solution.

[0025] In one possible implementation, the furnace ash on the surface of the semi-finished titanium strip after cleaning and annealing includes:

[0026] The annealed semi-finished titanium strip moves horizontally at a speed of 10m / min to 15m / min and passes through a degreasing and cleaning unit. The furnace ash on the surface of the annealed semi-finished titanium strip is cleaned by a second cleaning liquid, which is also an alkaline solution.

[0027] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0028] This application embodiment uses titanium-iron-copper alloy coils as the base component. The titanium-iron-copper alloy coils are cold-rolled 15-20 times to produce semi-finished titanium strips with periodically varying thicknesses of 0.1mm-0.4mm. After cleaning the rolled semi-finished titanium strips, residual grease from the rolling process is removed. The semi-finished titanium strips are then annealed to reduce the surface hardness, thereby increasing the yield strength of the harmonica reeds formed from the titanium alloy. Furthermore, because titanium alloys possess excellent corrosion resistance, the service life of the harmonica reeds made from titanium alloys is also improved. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A flowchart illustrating the preparation method of the titanium alloy strip provided in the embodiments of this application;

[0031] Figure 2A flowchart illustrating a method for preparing titanium alloy strip according to another embodiment of this application;

[0032] Figure 3 Metallographic image of titanium alloy strip prepared by the method for preparing titanium alloy strip provided in this application embodiment. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for 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 limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0035] Reference Figure 1 , Figure 1 A flowchart illustrating the preparation method of titanium alloy strip provided in this application embodiment.

[0036] This application provides a method for preparing titanium alloy strip for use as a harmonica reed. The method provided in this application includes steps 101, 102, 103 and 104.

[0037] Step 101: Obtain a titanium alloy coil with a thickness of 0.5 mm to 0.7 mm and an elongation of ≥30%. The titanium alloy coil has a tensile strength of ≥500 MPa and a yield strength of 450 MPa to 550 MPa. By cold rolling the titanium alloy coil 15 to 20 times, a semi-finished titanium strip with a periodically varying thickness of 0.1 mm to 0.4 mm is obtained. The titanium alloy coil is a titanium-iron-copper alloy, wherein the iron content is 1% to 1.1% and the copper content is 1% to 1.1%.

[0038] Step 102: Clean the surface of the semi-finished titanium strip to remove any residual grease after rolling.

[0039] Step 103: Place the semi-finished titanium strip into a high-vacuum furnace with a vacuum degree ≤5Pa for annealing.

[0040] Step 104: Clean the furnace ash from the surface of the annealed semi-finished titanium strip.

[0041] By using titanium-iron-copper alloy coils as the base material, and cold rolling the titanium-iron-copper alloy coils 15 to 20 times, a semi-finished titanium strip with a periodically varying thickness of 0.1 mm to 0.4 mm is produced. After cleaning the rolled semi-finished titanium strip, the residual grease on the surface of the semi-finished titanium strip is removed. Then, the semi-finished titanium strip is annealed to reduce the surface hardness of the rolled semi-finished titanium strip, thereby increasing the yield strength of the harmonica reeds made from the titanium alloy. At the same time, since titanium alloy has good corrosion resistance, the service life of the harmonica reeds made from titanium alloy is also improved.

[0042] In one possible implementation, when performing 15 to 20 cold rolling passes on the titanium alloy coil, the method provided in this application includes: rolling the titanium alloy coil through a 20-roll precision rolling mill, wherein the titanium alloy coil is rolled into a semi-finished titanium strip with a surface roughness ≤0.2μm and a thickness of 0.1mm to 0.4mm with periodic varying thickness, and the thickness error of the semi-finished titanium strip is ±0.001mm.

[0043] The 20-roll precision rolling mill uses M2 material for each work roll, and the surface roughness of each work roll is ≤0.2μm. The deformation of the titanium alloy coil after the first cold rolling is ≤8%, and the deformation of the titanium alloy coil after the last cold rolling is ≤6%. The deformation of the titanium alloy coil in the remaining cold rolling passes is 10% to 15%.

[0044] Due to the poor thermal conductivity of titanium alloy coils, machining them is costly and makes it difficult to obtain titanium alloy strips suitable for harmonica reed production. Furthermore, machining titanium alloy coils increases the probability of surface oxidation. Rolling titanium alloy coils using a 20-roll compact rolling mill improves the efficiency of obtaining titanium alloy strips suitable for harmonica reed production while reducing the need for processing titanium alloy sheets suitable for harmonica reeds. By controlling the deformation amount during the first rolling pass to ≤8%, the final rolling pass to ≤6%, and subsequent cold rolling deformations distributed between 10% and 15% according to design requirements, the probability of uneven stress distribution due to elastic rebound after 15-20 cold rolling passes is reduced, thereby extending the service life of the rolled semi-finished titanium sheets.

[0045] In one possible implementation, to further achieve the goal of rolling titanium alloy coils into titanium alloy strips to be processed, the method provided in this application includes, when performing rolling of the titanium alloy coils through a 20-roll precision rolling mill, setting the rolling tension of the 20-roll precision rolling mill to 60 N / mm. 2 ~100N / mm 2 The rolling speed is ≤40m / min; the diameter of the rolling work roll is 40mm; the diameter of the support roll is 210mm; the roll surface width is 300mm; the maximum rolling force is 4000kN; the titanium alloy coil is dynamically rolled with varying thickness by coordinating the horizontal rolling speed and the vertical rolling speed towards the titanium alloy strip of the 20-roll precision rolling mill.

[0046] By controlling the coordination between the horizontal rolling speed and the vertical rolling speed of the 20-roll precision rolling mill towards the titanium alloy coil, dynamic variable thickness rolling of the titanium alloy coil can be achieved. Dynamic variable thickness rolling can form the titanium alloy coil into a semi-finished titanium strip that is convenient for preparing harmonica reeds, thereby improving the efficiency of preparing semi-finished titanium strip.

[0047] In one possible implementation, the method provided in this application for rolling titanium alloy coils using a 20-roll precision mill includes: dynamically varying the thickness of the titanium alloy coils by coordinating the horizontal rolling speed and the vertical rolling speed towards the titanium alloy strip using the 20-roll precision mill; measuring the thickness of the rolled semi-finished titanium strip in real time using a thickness gauge; calculating the error between the measured thickness and a preset value; and adjusting the horizontal rolling speed or the vertical rolling speed towards the titanium alloy strip using the 20-roll precision mill based on the calculated error.

[0048] A 20-roll precision rolling mill is used to roll titanium alloy coils into semi-finished titanium strips. At the same time, a thickness gauge is used to measure the thickness of the semi-finished titanium strips rolled by the 20-roll precision rolling mill in real time. The error between the measured thickness value and the preset value is calculated. Based on the calculated error, the rolling speed of the 20-roll precision rolling mill in the horizontal direction or the rolling speed in the vertical direction toward the titanium alloy strip is adjusted, thereby achieving the purpose of controlling the length and thickness of the semi-finished titanium strips with periodic changes in thickness.

[0049] In one possible implementation, the present application uses a semi-finished titanium strip with periodically varying thickness, comprising thick and thin regions arranged alternately at intervals; wherein the thickness of the thick region is 0.3 mm to 0.4 mm, the thickness of the thin region is 0.1 mm to 0.2 mm, and the transition length between the thick and thin regions is 50 mm to 100 mm.

[0050] Reference Figure 2 , Figure 2 A flowchart illustrating a method for preparing titanium alloy strip according to another embodiment of this application.

[0051] In one possible implementation, the method for preparing titanium alloy strip provided in this application includes steps 201, 202, 203, 204, and 205.

[0052] Step 201: Obtain a titanium alloy coil with a thickness of 0.5 mm to 0.7 mm and an elongation of ≥30%. The titanium alloy coil has a tensile strength of ≥500 MPa and a yield strength of 450 MPa to 550 MPa. By cold rolling the titanium alloy coil 15 to 20 times, a semi-finished titanium strip with a periodically varying thickness of 0.1 mm to 0.4 mm is obtained. The titanium alloy coil is a titanium-iron-copper alloy, wherein the iron content is 1% to 1.1% and the copper content is 1% to 1.1%.

[0053] Step 202: Clean the surface of the semi-finished titanium strip to remove any residual grease after rolling.

[0054] Step 203: After cleaning the surface of the semi-finished titanium strip to remove residual grease after rolling, the cleaned semi-finished titanium alloy strip is loosely coiled using a slitting machine, with an applied coiling tension ≤25N / mm. 2 .

[0055] Step 204: Place the semi-finished titanium strip into a high-vacuum furnace with a vacuum degree ≤5Pa for annealing.

[0056] Step 205: Clean the furnace ash from the surface of the annealed semi-finished titanium strip.

[0057] In one possible implementation, when annealing the semi-finished titanium strip in a high-vacuum furnace with a vacuum degree ≤5Pa, the method provided in this application includes: the annealing temperature of the high-vacuum furnace is 640℃~680℃.

[0058] By setting the annealing temperature of the titanium coil high vacuum furnace to 640℃~680℃ and the vacuum degree of the titanium coil high vacuum furnace to ≤5Pa, the probability of oxidation during the preparation of semi-finished titanium plates can be reduced, and the yield strength of the semi-finished titanium plates after annealing can be increased, thereby improving the service life of the semi-finished plates.

[0059] In one possible implementation, when cleaning the surface of the semi-finished titanium strip after rolling to remove residual grease, the method provided in this application includes: the semi-finished titanium strip moves horizontally at a speed of 5m / min to 10m / min through a degreasing and cleaning unit, and the surface of the semi-finished titanium strip after rolling is cleaned with a first cleaning solution, which is also an alkaline solution.

[0060] In one possible implementation, when cleaning the furnace ash on the surface of the annealed semi-finished titanium strip, the method provided in this application includes: the annealed semi-finished titanium strip moving horizontally at a speed of 10m / min to 15m / min through a degreasing and cleaning unit, and cleaning the furnace ash on the surface of the annealed semi-finished titanium strip with a second cleaning liquid, wherein the second cleaning liquid is also an alkaline solution, and the concentration of the first cleaning liquid is greater than the concentration of the second cleaning liquid.

[0061] Reference Figure 3 , Figure 3 Metallographic image of titanium alloy strip prepared by the method for preparing titanium alloy strip provided in this application embodiment.

[0062] Example 1

[0063] Titanium-iron-copper coils with 1% Fe and 1% Cu were selected. The titanium-iron-copper coils have good surface quality, yield strength of 450 MPa, tensile strength of 510 MPa, elongation of 32%, and thickness of 0.5 mm.

[0064] Using a 20-roll precision rolling mill, at 80 N / mm 2 Under rolling tension and rolling speed below 50 m / min, after 14 rolling passes, the deformation amount of the first rolling pass is 6%, and the deformation amount of the last rolling pass is 5%, the above-mentioned titanium-iron-copper coil is rolled into a semi-finished titanium sheet with a thickness of 0.1 to 0.32 mm. The thickness error of the semi-finished titanium sheet is ±0.001 mm, and the surface roughness is 0.15 μm. During the rolling process, it is necessary to prevent strip breakage caused by the change in the thickness of the semi-finished titanium strip, and at the same time control the sheet shape.

[0065] The semi-finished titanium strip is passed through a degreasing and cleaning unit at a speed of 6 m / min to remove the rolling oil remaining on the surface of the semi-finished titanium strip during rolling.

[0066] The semi-finished titanium alloy strip after unwinding was annealed in a high vacuum furnace at 680℃ with an annealing vacuum of 4Pa. The surface of the titanium alloy strip was not oxidized after annealing.

[0067] The semi-finished titanium strip was passed through a degreasing and cleaning unit at a speed of 12 m / min to remove furnace ash and other impurities remaining on the surface of the semi-finished titanium strip during the annealing process. The metallographic structure of the annealed semi-finished titanium strip at a 50 μm state was observed by an electron microscope, and the surface of the titanium strip was smooth.

[0068] Example 2

[0069] Titanium-iron-copper coils with 1% Fe and 1% Cu were selected. The titanium-iron-copper coils have good surface quality, yield strength of 550 MPa, tensile strength of 580 MPa, elongation of 35%, and thickness of 0.5 mm.

[0070] Using a 20-roll precision rolling mill, at 100 N / mm 2 Under rolling tension and rolling speed below 40 m / min, after 14 rolling passes, the deformation amount of the first rolling pass is 6%, and the deformation amount of the last rolling pass is 5%, the above-mentioned titanium-iron-copper coil is rolled into a semi-finished titanium sheet with a thickness of 0.1 to 0.32 mm. The thickness error of the semi-finished titanium sheet is ±0.001 mm, and the surface roughness is 0.16 μm. During the rolling process, it is necessary to prevent strip breakage caused by the change in the thickness of the semi-finished titanium strip, and at the same time control the sheet shape.

[0071] The semi-finished titanium strip is passed through a degreasing and cleaning unit at a speed of 8 m / min to remove the rolling oil remaining on the surface of the semi-finished titanium strip during rolling.

[0072] The semi-finished titanium alloy strip after unwinding was annealed in a high-vacuum furnace at a temperature of 660℃ with an annealing vacuum of 5Pa. The surface of the titanium alloy strip was not oxidized after annealing.

[0073] The semi-finished titanium strip was passed through a degreasing and cleaning unit again at a speed of 14 m / min to remove furnace ash and other impurities remaining on the surface of the semi-finished titanium strip during the annealing process, resulting in a smooth titanium strip surface. The results are shown in Table 1.

[0074] Table 1. Room Temperature Mechanical Properties of Titanium Iron Copper Strips

[0075]

[0076] This application embodiment uses titanium-iron-copper alloy coils as the base component. The titanium-iron-copper alloy coils are cold-rolled 15-20 times to produce semi-finished titanium strips with periodically varying thicknesses of 0.1mm-0.4mm. After cleaning the rolled semi-finished titanium strips, residual grease from the rolling process is removed. The semi-finished titanium strips are then annealed to reduce the surface hardness, thereby increasing the yield strength of the harmonica reeds formed from the titanium alloy. Furthermore, because titanium alloys possess excellent corrosion resistance, the service life of the harmonica reeds made from titanium alloys is also improved.

[0077] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0078] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A method for preparing titanium alloy strip, characterized in that, The method includes: A titanium alloy coil with a thickness of 0.5 mm to 0.7 mm and an elongation of ≥30% is obtained. The titanium alloy coil has a tensile strength of ≥500 MPa and a yield strength of 450 MPa to 550 MPa. The titanium alloy coil is then subjected to 15 to 20 cold rolling passes to obtain a semi-finished titanium strip with a periodically varying thickness of 0.1 mm to 0.4 mm. The titanium alloy coil is a titanium-iron-copper alloy, wherein the iron content is 1% to 1.1% and the copper content is 1% to 1.1%. Clean the surface of the semi-finished titanium strip to remove residual grease after rolling; The semi-finished titanium strip is placed in a high-vacuum furnace with a vacuum degree ≤5Pa for annealing. Clean the furnace ash from the surface of the annealed semi-finished titanium strip; The process of cold rolling titanium alloy coils through 15-20 passes includes: The titanium alloy coil is rolled through a 20-roll precision rolling mill to produce a semi-finished titanium strip with a surface roughness ≤0.2μm and a thickness of 0.1mm~0.4mm with periodic varying thickness. The thickness error of the semi-finished titanium strip is ±0.001mm. The process of rolling the titanium alloy coil using a 20-roll precision rolling mill includes: The rolling tension of the 20-roll precision rolling mill is 60 N / mm. 2 ~100N / mm 2 The rolling speed is ≤40m / min; the titanium alloy coil is dynamically rolled with varying thickness by combining the horizontal rolling speed of the twenty-roll precision rolling mill with the vertical rolling speed towards the titanium alloy coil. The rolling of the titanium alloy coil through a 20-roll precision rolling mill also includes: The thickness of the pressed titanium alloy coil is measured in real time by a thickness gauge. The error between the measured thickness and the preset value is calculated. Based on the calculated error, the rolling speed of the 20-roll precision mill in the horizontal direction or the pressing speed in the vertical direction toward the titanium alloy coil is adjusted. The periodically varying thickness semi-finished titanium strip includes thick and thin regions arranged alternately; wherein the thickness of the thick region is 0.3mm~0.4mm, the thickness of the thin region is 0.1mm~0.2mm, and the transition length between the thick and thin regions is 50mm~100mm.

2. The method for preparing titanium alloy strip according to claim 1, characterized in that, The process of cold rolling titanium alloy coils through 15-20 passes includes: The deformation of titanium alloy coils after the first cold rolling is ≤8%, and the deformation of titanium alloy coils after the last cold rolling is ≤6%.

3. The method for preparing titanium alloy strip according to claim 1, characterized in that, The method further includes: After cleaning the surface of the semi-finished titanium strip to remove residual grease from the rolling process, the cleaned semi-finished titanium alloy strip is loosely coiled using a slitting machine, with an applied coiling tension ≤25N / mm. 2 .

4. The method for preparing titanium alloy strip according to claim 1, characterized in that, The step of annealing the semi-finished titanium strip in a high-vacuum furnace with a vacuum degree ≤5Pa includes: The annealing temperature of the titanium coil high vacuum furnace is 640℃~680℃.

5. The method for preparing titanium alloy strip according to claim 1, characterized in that, The grease remaining on the surface of the semi-finished titanium strip after rolling includes: The semi-finished titanium strip moves horizontally at a speed of 5m / min to 10m / min and passes through a degreasing and cleaning unit. The surface of the semi-finished titanium strip is cleaned with a first cleaning solution, which is an alkaline solution, to remove residual grease after rolling.

6. The method for preparing titanium alloy strip according to claim 1, characterized in that, The furnace ash on the surface of the semi-finished titanium strip after cleaning and annealing includes: The annealed semi-finished titanium strip moves horizontally at a speed of 10m / min to 15m / min and passes through a degreasing and cleaning unit. The furnace ash on the surface of the annealed semi-finished titanium strip is cleaned by a second cleaning liquid, which is also an alkaline solution.

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