Thin-walled nickel-titanium alloy tube and method for making the same

Abstract

The present application discloses a thin-walled nickel-titanium alloy tube and a manufacturing method thereof, which relates to the technical field of tube processing, including: pre-processing a nickel-titanium alloy tube blank as a spinning part, sleeve-fitting and fixing the spinning part on a core mold component; controlling the temperature T of the spinning part to rise by a heating component, so that a ball gradually contacts and squeezes the spinning part until the ball is pressed into the spinning part by a corresponding thinning amount ΔT, and at the same time setting the ratio of the number of ball rotations to the axial feed distance, that is, the feed ratio f n Spinning is performed, which is process one; adjusting the spinning temperature T, thinning amount ΔT, feed ratio f n Spinning is performed, which is process 2; multiple processes are performed through process 1, and then the process 2 is continued, wherein process 1 and process 2 have different spinning temperatures T, thinning amounts ΔT and feed ratios f n , together complete the spinning process of the spun parts, which is used to provide thin-walled nickel-titanium alloy tubes with more uniform wall thickness, better surface quality and higher performance.

Description

Technical Field

[0001] The present application relates to the technical field of tube processing, and in particular to a thin-walled nickel-titanium alloy tube and a manufacturing method thereof. Background Art

[0002] Currently, thin-walled nickel-titanium alloy tubes are processed by drawing, extrusion and other means, which are very prone to problems such as texture, work hardening, and uneven deformation. Based on the ball spinning method in the high-power spinning process, the point contact between the ball and the workpiece, and the continuous local plastic deformation of the material, the shape and wall thickness of the blank are changed by rotating the ball in conjunction with the axial movement of the blank, which can effectively prepare thin-walled tubes with more uniform wall thickness.

[0003] However, the selection of feed ratio, thinning amount and initial temperature during the processing has a great influence on the spinning forming performance of nickel-titanium alloy tubes, especially nickel-titanium alloy has high resistance to low-temperature deformation and poor plasticity; medium-temperature forming strain hardening and elastic recovery are difficult to control in precision; high temperature is prone to oxidation, so how to control the preparation of high-quality thin-walled nickel-titanium alloy tubes needs to be solved.

[0004] Therefore, it is necessary to provide a thin-walled nickel-titanium alloy tube and a manufacturing method thereof to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a thin-walled nickel-titanium alloy tube processing device, comprising: a machine tool, a spinning head, a core mold assembly and a heating assembly, wherein the machine tool is provided with a top shaft, the top shaft fixes the core mold assembly, and the spinning head is arranged on the main shaft of the machine tool, and a ball is arranged inside the spinning head;

[0006] The core mold assembly includes a core shaft fixedly connected to the top shaft, and the core shaft is hollow and has a heat preservation tube movably installed inside. The spinning part is sleeved on the core shaft, and the spinning part and the core shaft are fixed by a fixed sleeve.

[0007] The heating assembly includes a fixed seat arranged on the machine tool through a movable frame, an integrated shaft is fixedly arranged at the lower end of the fixed seat, and the end face of the integrated shaft is movably connected to the pressure plate through a pull rod, and a spiral heating wire is arranged between the pressure plate and the integrated shaft, and a control block for controlling the temperature and the pull rod position is fixedly arranged on the side of the integrated shaft.

[0008] The method for manufacturing a thin-walled nickel-titanium alloy tube in the present application comprises:

[0009] Pre-processing a nickel-titanium alloy tube blank as a spinning part, sleeve-fitting and fixing the spinning part on the core mold assembly, and then entering the spinning process;

[0010] First, the temperature T of the spun part is controlled to rise by the heating component, and then the spun part is processed by the spinning head, so that the ball gradually contacts and squeezes the spun part until the ball is pressed into the spun part by a corresponding thinning amount ΔT, and at the same time, the ratio of the number of turns of the ball to the axial feed distance is set, that is, the feed ratio f n Perform spinning, which is process one;

[0011] After completing step 1, the spinning temperature T is adjusted by the heating component to continue to squeeze the ball into the spun part, and the corresponding thinning amount ΔT of the ball being pressed into the spun part is changed. In addition, the ratio of the number of turns of the ball to the axial feed distance f is changed. n Perform spinning, which is process two;

[0012] After multiple processing passes through process one, the process continues to be processed through process two, where process one and process two have different spinning temperatures T, thinning amount ΔT and feed ratio f n , together completing the spinning process of the spun part.

[0013] Further, preferably, the spun parts are processed under reverse spinning conditions.

[0014] Further, as a preference, the rotation speed n of the spinning head driven by the machine tool spindle is set to 380 r / min.

[0015] Further, as a preference, the spinning temperatures T of the step 1 and the step 2 are set at 700°C and 780°C respectively, that is, the temperature is controlled by the heating component, and before the initial step 1 processing, the spun part passes through the heating wire for heating, and at this time, the heating wire is in an uncompressed state, and the spun part is heated uniformly over a large range, so that the spinning temperature T reaches 700°C to meet the processing requirements;

[0016] In addition, during the processing of step one and step two, the heating wire can be kept in the socketed state, and the compression and stretching adjustment can be performed by matching the processing progress through the edge holding plate. On the one hand, the processing temperature of the spun part is maintained, and on the other hand, the processing temperature adjustment requirements of the spun part in step two are met.

[0017] Furthermore, preferably, in each process, the position of the ball in the spinning head is adjusted to control the thinning amount ΔT of the spun part, wherein the thinning amount ΔT in process one is controlled at 0.3 mm, and the thinning amount ΔT in process two is controlled at 0.2 mm, and the axial bite angle is not greater than 25°.

[0018] Furthermore, as a preference, the balls are made of high carbon chromium bearing steel GCr15, HRC61-65, and the ball diameter d0 is selected to be 10 mm.

[0019] Furthermore, as a preferred embodiment, the feed rate f of the spun part during the processing under the spinning head is controlled by controlling the feed speed of the top shaft. n , the feed ratio f between process one and process two n The values ​​are 1.0mm / r and 0.5mm / r respectively.

[0020] Furthermore, preferably, the core shaft is made of hot working die steel 5Cr4Mo3SiMnVAl with high thermal strength and wear resistance, which can meet the working temperature of 700°C.

[0021] The present application adopts the aforementioned device and method to prepare a thin-walled nickel-titanium alloy tube.

[0022] Compared with the prior art, the present application provides a thin-walled nickel-titanium alloy tube and a method for making the same, which has the following beneficial effects:

[0023] 1. First, the spinning parts are processed through process one. The specific process parameters are spinning temperature T = 700 ° C, thinning amount ΔT = 0.3mm, feed ratio f n =1.0mm / r, under the condition of satisfying recrystallization, it provides better plastic deformation conditions, and at the same time controls the nickel-titanium alloy tube blank to have a higher nucleation rate, that is, more crystal nuclei, and at the same time controls and reduces the crystal nucleus growth time, so as to ensure that the subsequent formed nickel-titanium alloy tube has better mechanical properties;

[0024] 2. In this application, after multiple processes are completed in process one, process two is adopted for further processing. The specific process parameters are spinning temperature T = 780 ° C, thinning amount ΔT = 0.2 mm, feed ratio f n =0.5mm / r. After the first step of processing, the number of nuclei is initially determined, and the corresponding grain length can be determined with room for improvement to provide a relatively long nucleus growth time in exchange for better surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 It is a schematic diagram of processing equipment for thin-walled nickel-titanium alloy tubes;

[0027] Figure 2 Schematic diagram of the processing process of thin-walled nickel-titanium alloy tube;

[0028] Figure 3 This is a schematic diagram of the processing and installation of thin-walled nickel-titanium alloy tubes;

[0029] Figure 4 This is a schematic diagram of the processing and installation of thin-walled nickel-titanium alloy tubes;

[0030] Figure 5 This is a schematic diagram of the processing and installation of thin-walled nickel-titanium alloy tubes;

[0031] In the figure: 1, machine tool; 11, top shaft; 2, spinning head; 21, ball; 3, core mold assembly; 31, core shaft; 32, fixed sleeve; 33, insulation pipe; 4, spinning part; 5, heating assembly; 51, fixed seat; 52, integrated shaft; 53, heating wire; 54, edge plate; 55, pull rod; 56, control block. DETAILED DESCRIPTION

[0032] See also Figure 1-5 In the embodiment of the present application, the thin-walled nickel-titanium alloy tube processing device includes: a machine tool 1, a spinning head 2, a core mold assembly 3 and a heating assembly 5, wherein the machine tool 1 is provided with a top shaft 11, the top shaft 11 fixes the core mold assembly 3, and the spinning head 2 is arranged on the main shaft of the machine tool 1, and a ball 21 is arranged inside the spinning head 2, and the spinning is specifically performed by the ball 21;

[0033] The core mold assembly 3 includes a core shaft 31 fixedly connected to the top shaft 11, and the core shaft 31 is hollow and has a heat preservation tube 33 movably installed inside. The spinning part 4 is sleeved on the core shaft 31, and the spinning part 4 and the core shaft 31 are fixed by a fixing sleeve 32;

[0034] The heating assembly 5 includes a fixed seat 51 set on the machine tool 1 through a movable frame, an integrated shaft 52 is fixedly set at the lower end of the fixed seat 51, and the end face of the integrated shaft 52 is movably connected to a pressure plate 54 through a pull rod 55, and a spiral heating wire 53 is set between the pressure plate 54 and the integrated shaft 52, and a control block 56 for controlling the temperature and the position of the pull rod 55 is fixedly set on the side of the integrated shaft 52.

[0035] It needs to be explained that the heating wire 53 can be extruded through the pressure plate 54 to control the pitch. When the corresponding spun part 4 extends into the interior of the heating wire 53 for heating, a smaller pitch corresponds to faster heating, and a larger pitch corresponds to more uniform heating. The surface of the spun part 4 corresponds to the concentrated position of the heat source, presents an arc-shaped trajectory, fits the subsequent spinning path, ensures the temperature of the pressure-bearing position, flexibly adjusts the pitch, performs uniform heating before processing, and maintains temperature during the processing, which can effectively ensure the control of the spinning temperature.

[0036] It should be explained that the nickel-titanium alloy tube blank is processed by the ball spinning process, during which the ball 21 squeezes the surface of the spinning part 4 in a manner of a small contact area such as a point approximation, which can provide a higher unit pressure value to meet the forming requirements of the nickel-titanium alloy tube blank with high deformation resistance and work hardening rate;

[0037] In addition, when the nickel-titanium alloy tube billet is processed below the recrystallization temperature, dislocation entanglement, grain crushing and fiberization will occur, and the strength and hardness will increase, that is, work hardening will lead to processing difficulties. The nickel-titanium alloy tube is difficult to form, and the machine tool 1 is difficult to provide sufficient load. Therefore, hot spinning processing is adopted to use recrystallization to change the flexibility of dislocation movement and provide softening conditions for processing.

[0038] In this embodiment, the method for manufacturing a thin-walled nickel-titanium alloy tube includes:

[0039] A nickel-titanium alloy tube blank is pre-processed as a spinning part 4, and after the spinning part 4 is sleeved and fixed on the core mold assembly 3, a spinning process is entered. Specifically, a nickel-titanium alloy material with a composition of Ni50.9Ti49.1 can be selected, and a nickel-titanium alloy rod with a diameter of 12 mm is obtained by vacuum induction melting, rolling at 800°C and drawing at 400°C. The nickel-titanium alloy rod is solution treated at 850°C for 2 hours and then processed into a tube blank with an inner diameter of 10 mm and a wall thickness of 1 mm;

[0040] First, the temperature T of the spun part 4 is controlled to rise by the heating assembly 5, and then the spun part 4 is processed by the spinning head 2, so that the ball 21 gradually contacts and squeezes the spun part 4 until the ball 21 is pressed into the spun part 4 by a corresponding thinning amount ΔT, and at the same time, the ratio of the number of rotations of the ball 21 to the axial feed distance is set, that is, the feed ratio f n Perform spinning, which is process one;

[0041] After completing step 1, the spinning temperature T is adjusted by the heating assembly 5, the ball 21 continues to squeeze the spun part 4, the corresponding thinning amount ΔT of the ball 21 pressing into the spun part 4 is changed, and the ratio f of the number of rotations of the ball 21 to the axial feed distance is changed. n Perform spinning, which is process two;

[0042] After multiple processing passes through process one, the process continues to be processed through process two, where process one and process two have different spinning temperatures T, thinning amount ΔT and feed ratio f n , together complete the spinning process of the spun part 4.

[0043] As a preferred embodiment, the spun part 4 is processed under reverse spinning conditions, specifically, it is processed in a reverse spinning manner, and the deformation zone of the nickel-titanium alloy tube blank is subjected to three-dimensional compressive stress, providing better deformation conditions for the processing of the nickel-titanium alloy tube blank.

[0044] It should be explained that the relationship between the metal deformation flow direction and the movement direction of the core mold assembly 3 is used to distinguish. The opposite movement directions are the ball forward rotation and the same ball reverse rotation. When the nickel-titanium alloy tube billet is rotated forward, the metal in the main deformation zone of the nickel-titanium alloy tube billet is subjected to compressive stress in the tangential and radial directions and tensile stress in the axial direction. When the nickel-titanium alloy tube billet is rotated reversely, the tangential, radial and axial directions of the main deformation zone are all compressive stress.

[0045] According to the principles of plastic mechanics, the greater the compressive stress, the higher the plasticity of the material when deformed. For materials such as nickel-titanium alloy with poor plasticity and high degree of deformation hardening, reverse ball spinning is used to improve the plasticity of the material and achieve greater plastic deformation.

[0046] As a preferred embodiment, the rotation speed n of the main shaft of the machine tool 1 driving the spinning head 2 is set to 380r / min.

[0047] Because nickel-titanium alloy is a metal material that is difficult to form and suffers from severe work hardening at room temperature, the present application adopts hot spinning for processing to provide temperature conditions for the nickel-titanium alloy, which is convenient for dynamic recrystallization during thermoplastic deformation, and provides softening conditions through re-nucleation and nucleus growth inside the nickel-titanium alloy, thereby facilitating processing.

[0048] As a preferred embodiment, the spinning temperatures T of the process one and the process two are set to 700°C and 780°C respectively, that is, the temperature is controlled by the heating assembly 5. Before the initial process one, the spinning part 4 passes through the heating wire 53 for heating. At this time, the heating wire 53 is in an uncompressed state, and the spinning part 4 is heated uniformly over a large area, so that the spinning temperature T reaches 700°C to meet the processing requirements.

[0049] In addition, during the processing of step one and step two, the heating wire 53 can be kept in the sleeved state, and the compression and stretching adjustment can be performed by matching the processing progress through the edge holding plate 54, so as to maintain the processing temperature of the spun part 4 on the one hand, and meet the processing temperature adjustment requirements of the spun part 4 in step two on the other hand.

[0050] It needs to be explained that different deformation temperatures have different effects on nickel-titanium alloys. Under conditions below 700°C, nickel-titanium alloys undergo dynamic recovery and dynamic recrystallization at the same time, and the grains are elongated into fibers; under conditions of 700°C, dynamic recrystallization is the main process; when the temperature is above 700°C, as the temperature increases, the grains will grow significantly, but too high a temperature will cause the grains to be too coarse;

[0051] Therefore, 700°C and 780°C were selected as the spinning temperatures to ensure that the requirements of dynamic recrystallization during the processing process were met. At the same time, the time required for dynamic recrystallization was controlled by different temperatures, thereby controlling the grain size and facilitating the control of the physical properties of the final formed nickel-titanium alloy tube.

[0052] It should be explained that, because the thinning amount ΔT of the wall thickness of the nickel-titanium alloy tube blank is too small, the deformation zone of the spinning part 4 cannot penetrate the entire cross section, so that the metal inside the nickel-titanium alloy tube blank only undergoes elastic deformation instead of plastic deformation, and the number of spinning passes will also be increased, affecting production efficiency;

[0053] Too large a reduction in the wall thickness of the titanium alloy tube blank, ΔT, will lead to serious accumulation and bulge, bulge, expansion or annular fracture and other quality defects in front of the ball 21;

[0054] Moreover, during the hot spinning process, if the degree of deformation is too small, the energy generated may be insufficient to support dynamic recrystallization; if the degree of deformation is large and sufficient energy is generated, it will promote dynamic recrystallization, increase the dislocation density of the nickel-titanium alloy structure, intensify the lattice distortion, and increase the number of nucleations per unit volume to form fine grains.

[0055] As a preferred embodiment, the position of the ball 21 in the spinning head 2 is adjusted in each process to control the thinning amount ΔT of the spun part 4, wherein the thinning amount ΔT in process one is controlled at 0.3 mm, and the thinning amount ΔT in process two is controlled at 0.2 mm, and the axial bite angle is no more than 25°.

[0056] It should be explained that the spun part 4 is first processed through step 1, and the corresponding spun part 4 has a larger wall thickness value, and a correspondingly larger thinning amount ΔT=0.3 mm is adopted to ensure that the inside of the spun part 4 is thermoplastically deformed. At the same time, the number of nuclei inside the nickel-titanium alloy tube billet is increased during the processing, which is conducive to a more uniform crystal structure and more relative area of ​​grain boundaries inside the nickel-titanium alloy tube formed in the final form, and correspondingly improves the internal dislocation resistance of the nickel-titanium alloy tube formed in the final form, thereby improving the strength and plasticity;

[0057] After completing multiple processing steps in process one, process two is used for less processing. After processing in process one, the wall thickness of the nickel-titanium alloy tube blank is thinned, that is, the wall thickness value of the spun part 4 corresponding to process two is lower, and a relatively small thinning amount ΔT=0.2mm is adopted. At the same time, the internal thermoplastic deformation of the spun part 4 is guaranteed, and the spinning temperature corresponding to process two is higher than that of process one, which is sufficient to meet the dynamic recrystallization during the processing of the nickel-titanium alloy tube blank, and at the same time, the surface quality of the spun part 4 can be relatively improved.

[0058] As a preferred embodiment, the ball 21 is made of high carbon chromium bearing steel GCr15, HRC61-65, and the ball diameter d0 is selected to be 10 mm. The specific diameter of the ball 21 is determined and selected based on past experience, the thinning amount ΔT and the bite angle, mainly to avoid defects such as ripples on the surface of the nickel-titanium alloy tube due to inappropriate ball diameter.

[0059] It needs to be explained that different structures are suitable for feed ratio f nDifferent, that is, the ratio of the axial feed speed of the ball 21 to the rotation speed of the ball 21 is different, because the nickel-titanium alloy matrix is ​​a body-centered cubic structure and the impurity is a face-centered cubic structure, and according to the previous experience of spinning processing, the best range of the spinning feed ratio of most metal materials with a body-centered cubic structure is between 0.1mm / r and 1.5mm / r, and the spinning feed ratio range of metal materials with a face-centered cubic structure is between 0.3mm / r and 3mm / r;

[0060] Too large feed ratio f n There will be defects such as rough surface of the spinning part 4, but the feed ratio f n The larger the ball, the greater the spinning force component, which is more conducive to the plastic deformation of the spinning part 4.

[0061] As a preferred embodiment, the feed rate f of the spin part 4 during the processing under the spin head 2 is controlled by controlling the feed rate of the top shaft 11. n , the feed ratio f between process one and process two n The values ​​are 1.0mm / r and 0.5mm / r respectively. Based on the previous experience and the premise of ensuring quality, this application determines that the process 1 has a relatively large feed ratio f n =1.0mm / r, giving priority to ensuring good plastic deformation conditions of the spun part 4, and using a relatively small feed ratio f in process 2 n =0.5mm / r ensures better surface quality.

[0062] As a preferred embodiment, the core shaft 31 is made of hot working die steel 5Cr4Mo3SiMnVAl with high thermal strength and wear resistance, which can meet the working temperature above 700°C. Specifically, the core shaft 31 provides support for the spun part 4, and cooperates with the ball 21 to make the material yield and deform. The surface accuracy is required to reach level 2. In order to facilitate demolding, the diameter of the core shaft 31 should be slightly smaller than the inner diameter of the spun part 4 to achieve a clearance fit with the spun part 4.

[0063] The following is a complete comparison of process parameters between process one and process two:

[0064]

[0065] Spinning process parameter table

[0066] In this embodiment, the aforementioned device and method are used to prepare a thin-walled nickel-titanium alloy tube.

[0067] In the specific implementation, the spinning part is first processed by process one, and the specific process parameters are spinning temperature T = 700 ° C, thinning amount ΔT = 0.3mm, feed ratio f n=1.0mm / r, under the condition of satisfying recrystallization, it provides better plastic deformation conditions, and at the same time controls the nickel-titanium alloy tube blank to have a higher nucleation rate, that is, more crystal nuclei, and at the same time controls and reduces the crystal nucleus growth time, so as to ensure that the subsequent formed nickel-titanium alloy tube has better mechanical properties;

[0068] After completing multiple processing steps in process one, process two is adopted for further processing. The specific process parameters are spinning temperature T = 780 ° C, thinning amount ΔT = 0.2 mm, feed ratio f n =0.5mm / r. After the first step of processing, the number of nuclei is initially determined, and the corresponding grain length can be determined with room for improvement to provide a relatively long nucleus growth time in exchange for better surface quality.

[0069] What has been described above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A method for manufacturing a thin-walled nickel-titanium alloy tube, characterized in that: include: Pre-processing a nickel-titanium alloy tube blank as a spinning part (4), sleeve-fitting and fixing the spinning part (4) on the core mold assembly (3), and then entering a spinning process; First, the temperature of the spun part (4) is raised by controlling the heating component (5), and then the spun part (4) is processed by the spinning head (2), so that the ball (21) arranged inside the spinning head (2) gradually contacts and squeezes the spun part (4), until the ball (21) is pressed into the spun part (4) by a corresponding thinning amount ΔT, and at the same time, the ratio of the number of rotations of the ball (21) to the axial feed distance, i.e., the feed ratio fn, is set for spinning, and this process is process one; After completing step one, the heating component (5) is continued to adjust the spinning temperature T, and the ball (21) continues to extrude the spun part (4), and the ball (21) is changed to be pressed into the spun part (4) again by a corresponding thinning amount ΔT, and the ratio fn of the number of rotations of the ball (21) and the axial feed distance is changed to perform spinning, which is step two; Performing multiple processing steps through step one, and then continuing processing through step two, wherein step one and step two have different spinning temperatures T, thinning amounts ΔT, and feed ratios fn, and jointly complete the spinning process of the spun part (4); The spinning temperatures T of the step one and the step two are set at 700° C. and 780° C. respectively, that is, the temperature is controlled by the heating component (5). Before the initial step one processing, the spun part (4) passes through the heating wire (53) of the heating component (5) for heating. At this time, the heating wire (53) is in an uncompressed state, and the spun part (4) is heated evenly over a large area, so that the spinning temperature T reaches 700° C. to meet the processing requirements; Furthermore, during the processing of step one and step two, the heating wire (53) can be kept in the sleeved state, and the edge plate (54) of the heating component (5) can be used to match the processing progress to perform compression and extension adjustment, thereby maintaining the processing temperature of the spun part (4) on the one hand, and satisfying the processing temperature adjustment requirements of the spun part (4) in step two on the other hand; In each process, the position of the ball (21) in the spinning head (2) is adjusted to thereby control the thinning amount ΔT of the spun part (4), wherein the thinning amount ΔT in process one is controlled at 0.3 mm, and the thinning amount ΔT in process two is controlled at 0.2 mm, and the axial bite angle is not greater than 25°; By controlling the feed speed of the top shaft (11) on the machine tool (1), the feed ratio fn of the spun part (4) during processing under the spinning head (2) is controlled, and the feed ratio fn of the process one and process two are 1.0 mm / r and 0.5 mm / r respectively.

2. The method for manufacturing a thin-walled nickel-titanium alloy tube according to claim 1, characterized in that: The spun part (4) is processed under reverse spinning conditions.

3. The method for manufacturing a thin-walled nickel-titanium alloy tube according to claim 1, characterized in that: The rotation speed n of the main shaft of the machine tool (1) driving the spinning head (2) is set to 380 r / min.

4. The method for manufacturing a thin-walled nickel-titanium alloy tube according to claim 1, characterized in that: The ball (21) is made of high carbon chromium bearing steel GCr15, HRC61-65, and the ball diameter d0 is 10 mm.

5. The method for manufacturing a thin-walled nickel-titanium alloy tube according to claim 1, characterized in that: The core shaft (31) is made of hot working die steel 5Cr4Mo3SiMnVAl with high thermal strength and wear resistance, which can meet the working temperature of 700°C.

6. A thin-walled nickel-titanium alloy tube, characterized in that: The method is prepared according to any one of claims 1 to 5.

7. A thin-walled nickel-titanium alloy tube processing device, used in the thin-walled nickel-titanium alloy tube manufacturing method according to any one of claims 1 to 5, characterized in that: include: A machine tool (1), a spinning head (2), a core mold assembly (3) and a heating assembly (5), wherein the machine tool (1) is provided with a top shaft (11), the top shaft (11) fixes the core mold assembly (3), and the spinning head (2) is arranged on the main shaft of the machine tool (1), and a ball (21) is arranged inside the spinning head (2); The core mold assembly (3) comprises a core shaft (31) fixedly connected to the top shaft (11), and the core shaft (31) is hollow and has a heat preservation tube (33) movably installed inside. The spinning part (4) is sleeved on the core shaft (31), and the spinning part (4) and the core shaft (31) are fixed by a fixing sleeve (32); The heating assembly (5) comprises a fixed seat (51) arranged on the machine tool (1) via a movable frame, an integrated shaft (52) is fixedly arranged at the lower end of the fixed seat (51), and the end surface of the integrated shaft (52) is movably connected to a pressure plate (54) via a pull rod (55), a spiral heating wire (53) is arranged between the pressure plate (54) and the integrated shaft (52), and a control block (56) for controlling the temperature and the position of the pull rod (55) is fixedly arranged on the side of the integrated shaft (52).

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