PtNi alloy thin-walled tube forming method and device

Abstract

The invention discloses a PtNi alloy thin-walled tube forming method and device, and relates to the field of precious metal materials.The PtNi alloy thin-walled tube forming method comprises the steps that S1, a tube blank is prepared, specifically, a material needing to be drawn is preprocessed through a known method, and a cast ingot is made into the tube blank in a processing mode; s2, long core rod drawing is conducted, specifically, the prepared pipe blank is drawn through a NiTi alloy core rod, and the long core rod drawing technology is adopted; and S3, thermal shrinkage and coring are conducted, specifically, the pipe blank obtained in the S2 and the NiTi alloy core rod are placed in warm water together, and the NiTi alloy core rod is taken out. According to the PtNi alloy thin-walled tube forming method and device, the cold expansion and heat shrinkage characteristics generated by phase transformation of NiTi alloy austenite and martensite are ingeniously utilized, the NiTi alloy is used as a core rod for drawing, the novel core rod of a thin-walled tube can be easily taken out without tube stripping, and compared with conventional long core rod drawing, the surface quality of the tube is greatly improved; the inner diameter and the outer diameter are well guaranteed, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of precious metal material application, and in particular to a PtNi alloy thin-wall tube forming method and device. Background Art

[0002] Platinum-nickel alloy is an important elastic alloy with high elasticity, high strength, good corrosion resistance and oxidation resistance. Therefore, platinum-nickel alloy pipes are widely used in the fields of industry and medical equipment. Common drawing methods for pipes are air drawing, long mandrel drawing, fixed short mandrel drawing, and floating mandrel drawing. The characteristic of long mandrel drawing is a large pass processing rate, but because it is necessary to prepare many long mandrels of different diameters and increase the tube removal process, it is rarely used in normal production. However, long mandrel drawing is suitable for the drawing of thin-walled pipes and pipes with poor plasticity; In the prior art, long mandrel drawing is a method of drawing a tube blank freely on a mandrel with a polished surface, so that the mandrel and the tube blank are pulled through the die hole together to achieve a reduction in diameter and wall. This method has become a common method for drawing thin-walled tubes. After one drawing pass, the tube and the mandrel are locked together, and it is necessary to use a tube stripping method or a rolling method to slightly expand the outer diameter of the tube so as to remove the mandrel. In order to overcome the above shortcomings, the Chinese patent of the prior art (Announcement No. CN106964660B) discloses a long mandrel device for cold drawing and wall reduction of metal pipes. The left and right end caps with center holes are connected to the left and right ends of the mandrel outer sleeve through left and right screw groups respectively. The center holes of the left and right end caps are connected to the pressure hole and the oiling hole respectively, and are connected to the pressure device interface and the oiling device interface. The outer side of the left end cap is connected to the drawing head. The advantages are to reduce the damage to the end and the inner and outer surfaces of the metal pipe during the rod removal process; reduce the weight of the mandrel for wall reduction processing of large-diameter thin-walled metal pipes; reduce the wear on the mandrel surface and extend the service life of the mandrel; simplify the lubrication process of the inner surface of the metal pipe, reduce lubricant consumption and environmental pollution; In order to overcome the above-mentioned shortcomings, a Chinese patent of the prior art (Announcement No. CN108067514A) discloses a pipe core-removing device, in which a transmission assembly includes a transmission housing, a pulley, an input shaft, a high-speed gear, a transmission gear pair and an output shaft arranged in the transmission housing, wherein the transmission gear pair is arranged horizontally in the transmission housing, one end of the input shaft is key-connected to the pulley, the high-speed gear is arranged between two adjacent groups of transmission gear pairs and meshes with each other, a high-speed gear is mounted on the input shaft, and the output shaft is key-connected to the transmission gear pair; the core-removing assembly includes a frame and a core-removing roller group, the core-removing roller group includes an upper roller and a lower roller, and grooves are arranged on the upper roller and the lower roller; the driving device is connected to the pulley through a belt, and the output shaft is connected to the core-removing roller group. The beneficial effect is that the core-removing requirements of different pipes can be met to avoid damage to the pipe during the core-removing process; and it has the advantages of simple structure, convenient operation and strong practicality; Although the existing technology can overcome the above-mentioned shortcomings, there are still other problems in its operation. The surface quality of the tube will inevitably deteriorate due to roller rolling, which becomes the main disadvantage of long mandrel drawing. The mandrel material of long mandrel drawing is usually selected from spring steel, bearing steel, etc. After each drawing, the tube needs to be removed by rolling. The removal process causes the inner and outer diameters to increase and the surface quality to deteriorate. Summary of the invention

[0003] The purpose of the present invention is to provide a PtNi alloy thin-walled tube forming method and device to solve the problem mentioned in the above background technology that the surface quality of the tube will inevitably deteriorate due to roller rolling, which becomes the main disadvantage of long mandrel drawing. The material of the mandrel for long mandrel drawing is usually selected from spring steel, bearing steel, etc. After each drawing, the tube needs to be removed by rolling. The removal process causes the inner and outer diameters to increase and the surface quality to deteriorate.

[0004] To achieve the above object, the present invention provides the following technical solutions: a PtNi alloy thin-wall tube forming method and device, including S1, preparing a tube blank; S2, long mandrel drawing; S3, heat shrink coring; S4, repeated processing; S5, observing the material; The specific steps include: S1. Preparation of tube blank

[0005] Pre-processing the material to be drawn by a known method, so that the ingot is processed into a tube blank; S2, long mandrel drawing

[0006] The prepared tube blank is drawn through a NiTi alloy mandrel, using a long mandrel drawing technique; S3, heat shrink coring

[0007] The tube blank obtained in S2 is placed in warm water together with the NiTi alloy core rod, and the NiTi alloy core rod is taken out; S4, repeated processing; The tube blank is again drawn through the NiTi alloy mandrel and after the drawing is completed, it is again placed in warm water; S5. Observe the material; Observe the surface of the prepared pipe to check the quality of the pipe after forming; The long core rod drawing comprises a base and a drawing die fixedly installed on the upper right end of the base, and the drawing die is arranged corresponding to the tube blank, and a NiTi alloy core rod is arranged through the inside of the tube blank.

[0008] Furthermore, the processing method adopted in S1 can be a machining punching method, a deep drawing method and an extrusion punching method, so that the ingot is processed to obtain a tube blank.

[0009] Furthermore, in S2, a NiTi alloy mandrel 4 is used as a long mandrel drawing tube material. Preferably, the NiTi alloy mandrel 4 is drawn with a diameter tolerance of 0.002 mm, and the deformation of the tube is 10% to 20% per drawing pass. The composition ratio of the NiTi alloy mandrel 4 includes NiTi45 and NiTi50.

[0010] Furthermore, when the tube needs to be loosened after each drawing in S3, the tube and the mandrel obtained in S2 are fixed at both ends and placed in warm water at 70°C to 100°C, and the mandrel is made thinner by utilizing the "cold expansion and hot contraction" characteristics caused by the phase change of the NiTi alloy, so that the mandrel can be taken out without loosening the tube.

[0011] Furthermore, in S4, the processing of S2 and S3 is repeated until the PtNi alloy thin-walled tube with a size of 2.4×2.35 and a wall thickness of 0.025 mm is drawn.

[0012] Furthermore, in S5, the surface quality of the pipe is observed through a microscope, so that the quality of the pipe can be accurately checked.

[0013] Furthermore, a servo motor is fixedly installed at the lower end of the base, and a bidirectional threaded rod is fixedly installed at the output end of the servo motor, and the threads at the front and rear ends of the bidirectional threaded rod are opposite, and the bidirectional threaded rod is rotatably installed at the bottom of the base through a limit sleeve, and a stop block is fixedly installed at the middle end of the bidirectional threaded rod.

[0014] Furthermore, a positioning clamp is installed on the surface thread of the bidirectional threaded rod, and the upper end of the positioning clamp is arc-shaped, and the positioning clamp is arranged corresponding to the tube blank, and a limiting rod is installed through the middle end of the positioning clamp, and the front and rear ends of the limiting rod are fixedly installed on the inner wall of the base.

[0015] Furthermore, a fixed platform is fixedly installed on the upper left end of the base, and a positioning rod is provided on the upper end of the fixed platform, and a movable block is installed through the surface of the positioning rod, and a buffer rod is rotatably installed on the upper end of the movable block, and a kit is rotatably installed on the upper end of the buffer rod.

[0016] Furthermore, the kit is sleeved on the outside of the NiTi alloy core rod, and a cleaning scraper is provided inside the kit, and the cleaning scraper is arranged to fit the outer wall of the NiTi alloy core rod, a buffer spring is fixedly installed on the inner side of the movable block, and the inner side of the buffer spring is fixedly installed on the upper end of the fixed platform, and a damping rod is provided between the fixed platform and the inner center of the kit.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The "cold expansion and hot contraction" characteristics of NiTi alloy produced by the phase transformation of austenite and martensite are cleverly utilized. NiTi alloy is used as a mandrel for drawing. A new mandrel that can easily take out thin-walled pipes without removing the pipe is used. Compared with conventional long mandrel drawing, the surface quality of the pipe is greatly improved; the inner and outer diameters are better guaranteed, and the production efficiency is greatly improved; Furthermore, after the tube is drawn, there is no need to perform conventional multi-roller rolling to press the surface of the tube to remove the tube, and the surface quality of the obtained tube is better than that of the conventional long mandrel drawing; 2. When the bidirectional threaded rod rotates, it drives the positioning clamping plate connected by the thread on its surface to clamp the tube blank under the limit of the limit rod, so that the tube blank can be supported and lifted. The arc shape of the positioning clamping plate can limit the tube blank to prevent its vibration, and will not limit the movement of the tube blank during the drawing process; Furthermore, when the NiTi alloy mandrel rod arranged inside the tube blank moves, the movable block on the fixed platform can prevent the NiTi alloy mandrel rod from shaking during drawing, thereby preventing the inside of the tube blank from being offset. At the same time, a cleaning scraper fitting the NiTi alloy mandrel rod is provided inside the kit to clean the NiTi alloy mandrel rod and prevent impurities on the surface of the NiTi alloy mandrel rod from affecting the shape of the inside of the tube after drawing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the process of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the drawn tube blank of the present invention; Figure 3 This is a bottom-up three-dimensional structural schematic diagram of a drawn tube blank according to the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the positioning splint of the present invention in side section; Figure 5 This is a schematic diagram of the front sectional three-dimensional structure of the drawing die of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the fixed platform of the present invention from a side view; Figure 7 It is a schematic diagram of the three-dimensional structure of the kit of the present invention in side section; Figure 8 It is a schematic diagram of the three-dimensional structure of the movable block of the present invention.

[0019] In the figure: a base (1), a drawing die (2), a tube blank (3), a NiTi alloy mandrel (4), a servo motor (5), a bidirectional threaded rod (6), a limit sleeve (7), a positioning clamp (8), a stopper (9), a limit rod (10), a fixed platform (11), a positioning rod (12), a movable block (13), a buffer rod (14), a kit (15), a buffer spring (16), a damping rod (17), and a cleaning scraper (18). 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] Embodiment 1: like Figure 1 The technical solution shown, in order to solve the problem of NiTi45 alloy mandrel and 90°C warm water test results, discloses: S1, preparing tube blank; S2, long mandrel drawing; S3, heat shrink coring; S4, repeated processing; S5, observing material quality; The specific steps include: S1. Preparation of tube blank

[0022] Pre-processing the material to be drawn by a known method, so that the ingot is processed to obtain a tube blank 3; S2, long mandrel drawing

[0023] The prepared tube blank 3 is drawn through a NiTi alloy mandrel 4, using a long mandrel drawing technology; S3, heat shrink coring

[0024] The tube blank 3 obtained in S2 and the NiTi alloy core rod 4 are placed in warm water, and the NiTi alloy core rod 4 is taken out; S4, repeated processing; The tube blank 3 is again drawn through the NiTi alloy mandrel 4, and after the drawing is completed, it is again placed in warm water; S5. Observe the material; Observe the surface of the prepared pipe to check the quality of the pipe after forming; The processing method adopted in S1 can be a machining punching method, a deep drawing method and an extrusion punching method, so that the ingot is processed to obtain a tube blank 3.

[0025] S2 uses a NiTi alloy mandrel 4 long mandrel drawing tube material, preferably the NiTi alloy mandrel 4 is drawn with a diameter tolerance of 0.002 mm, the deformation of each tube drawing pass is 10% to 20%, and the composition ratio of the NiTi alloy mandrel 4 includes NiTi45 and NiTi50.

[0026] When the tube needs to be loosened after each drawing in S3, the tube and the mandrel obtained in S2 are fixed at both ends and placed in warm water at 70℃~100℃. The "cold expansion and hot contraction" characteristics caused by the phase change of NiTi alloy are used to make the mandrel thinner, and the mandrel can be taken out without loosening the tube.

[0027] In S4, the processing of S2 and S3 is repeated until a PtNi alloy thin-walled tube with a size of 2.4×2.35 and a wall thickness of 0.025 mm is drawn.

[0028] In S5, the surface quality of the pipe is observed through a microscope, which can accurately check the quality of the pipe; In the embodiment

[0029] Step 1: Prepare a tube blank 3 by machining and punching a PtNi alloy ingot; Step 2: Line the PtNi alloy tube blank on the NiTi45 alloy mandrel for drawing, and control the deformation amount of each pass to 10% to 20%; Step 3: Fix the two ends of the core rod obtained after step 2 and place it in 90°C warm water for 5 minutes, use the "cold expansion and hot contraction" characteristics of NiTi alloy to make the NiTi45 alloy core rod thinner, cut off the head end of the NiTi45 alloy core rod, take out the PtNi alloy tube and measure the diameter of the NiTi45 alloy core rod; Step 4: Repeat the processing of steps 2 and 3 until the PtNi alloy thin-walled tube with a size of 2.4×2.35 and a wall thickness of 0.025 mm is drawn; Step 5: Observe the surface quality of the tube under a microscope. The surface quality of the tube is excellent and has no defects. Embodiment 2:

[0030] like Figure 1 The technical solution shown, in order to solve the problem of NiTi50 alloy mandrel and 85°C test results, discloses: S1, preparing tube blank; S2, long mandrel drawing; S3, heat shrink coring; S4, repeated processing; S5, observing material quality; The specific steps include: S1. Preparation of tube blank

[0031] Pre-processing the material to be drawn by a known method, so that the ingot is processed to obtain a tube blank 3; S2, long mandrel drawing

[0032] The prepared tube blank 3 is drawn through a NiTi alloy mandrel 4, using a long mandrel drawing technology; S3, heat shrink coring

[0033] The tube blank 3 obtained in S2 and the NiTi alloy core rod 4 are placed in warm water, and the NiTi alloy core rod 4 is taken out; S4, repeated processing; The tube blank 3 is again drawn through the NiTi alloy mandrel 4, and after the drawing is completed, it is again placed in warm water; S5. Observe the material; Observe the surface of the prepared pipe to check the quality of the pipe after forming; The processing method adopted in S1 can be a machining punching method, a deep drawing method and an extrusion punching method, so that the ingot is processed to obtain a tube blank 3.

[0034] S2 uses a NiTi alloy mandrel 4 long mandrel drawing tube material, preferably the NiTi alloy mandrel 4 is drawn with a diameter tolerance of 0.002 mm, the deformation of each tube drawing pass is 10% to 20%, and the composition ratio of the NiTi alloy mandrel 4 includes NiTi45 and NiTi50.

[0035] When the tube needs to be loosened after each drawing in S3, the tube and the mandrel obtained in S2 are fixed at both ends and placed in warm water at 70℃~100℃. The "cold expansion and hot contraction" characteristics caused by the phase change of NiTi alloy are used to make the mandrel thinner, and the mandrel can be taken out without loosening the tube.

[0036] In S4, the processing of S2 and S3 is repeated until a PtNi alloy thin-walled tube with a size of 2.4×2.35 and a wall thickness of 0.025 mm is drawn.

[0037] In S5, the surface quality of the pipe is observed through a microscope, which can accurately check the quality of the pipe; In the embodiment

[0038] Step 1: Prepare a tube blank 3 by machining and punching a PtNi alloy ingot; Step 2: Line the PtNi alloy tube blank on the NiTi50 alloy mandrel for drawing, and control the deformation amount of each pass to 10% to 20%; Step 3: Fix the two ends of the core rod obtained after step 2 and place it in 85°C warm water for 5 minutes, use the "cold expansion and hot contraction" characteristics of NiTi alloy to make the NiTi50 alloy core rod thinner, cut off the head end of the NiTi50 alloy core rod, take out the PtNi alloy tube and measure the diameter of the NiTi50 alloy core rod; Step 4: Repeat the processing of steps 2 and 3 until the PtNi alloy thin-walled tube with a size of 2.4×2.35 and a wall thickness of 0.025 mm is drawn; Step 5: Observe the surface quality of the tube under a microscope. The surface quality of the tube is excellent and has no defects. Embodiment three:

[0039] like Figure 1-Figure 8 The technical scheme shown, in order to solve the problem that shaking affects the drawing quality, discloses: the long core rod drawing includes a base 1 and a drawing die 2 fixedly installed on the upper right end of the base 1, and the drawing die 2 is arranged corresponding to the tube blank 3, and a NiTi alloy core rod 4 is arranged through the inside of the tube blank 3, a servo motor 5 is fixedly installed on the lower end of the base 1, and a bidirectional threaded rod 6 is fixedly installed on the output end of the servo motor 5, and the front and rear ends of the bidirectional threaded rod 6 have opposite threads, and the bidirectional threaded rod 6 is rotatably installed under the base 1 through a limit sleeve 7, a stopper 9 is fixedly installed on the middle end of the bidirectional threaded rod 6, a positioning splint 8 is threadedly installed on the surface of the bidirectional threaded rod 6, and the upper end shape of the positioning splint 8 is arc-shaped, and the positioning splint 8 is arranged corresponding to the tube blank 3, and the middle end of the positioning splint 8 is arranged through the positioning splint 8. A limit rod 10 is provided, and the front and rear ends of the limit rod 10 are fixedly installed on the inner wall of the base 1, a fixed platform 11 is fixedly installed on the upper left end of the base 1, and a positioning rod 12 is provided on the upper end of the fixed platform 11, and a movable block 13 is installed through the surface of the positioning rod 12, and a buffer rod 14 is rotatably installed on the upper end of the movable block 13, and a set 15 is rotatably installed on the upper end of the buffer rod 14, and the set 15 is sleeved on the outer side of the NiTi alloy core rod 4, and a cleaning scraper 18 is provided inside the set 15, and the cleaning scraper 18 is arranged in contact with the outer wall of the NiTi alloy core rod 4, a buffer spring 16 is fixedly installed on the inner side of the movable block 13, and the inner side of the buffer spring 16 is fixedly installed on the upper end of the fixed platform 11, and a damping rod 17 is provided at the inner center of the fixed platform 11 and the set 15; In the embodiment, when in use, the NiTi alloy core rod 4 is embedded in the tube blank 3, and the tube blank is drawn on the base 1 through the drawing mold 2. At this time, the servo motor 5 is set to make the bidirectional threaded rod 6 rotate under the limit of the limit sleeve 7. When the bidirectional threaded rod 6 rotates, it drives the positioning clamping plate 8 threadedly connected on its surface to clamp the tube blank 3 under the limit of the limit rod 10. At the same time, a stopper 9 is provided at the middle end of the bidirectional threaded rod 6 to avoid collision between the front and rear positioning clamping plates 8, so that the tube blank 3 can be supported and lifted. The arc shape of the positioning clamping plate 8 can limit the tube blank 3 to prevent it from vibrating, and will not limit the movement of the tube blank 3 during the drawing process. At the same time, when the NiTi alloy core rod 4 set inside the tube blank 3 moves, the fixed plane The movable block 13 on the platform 11 applies pressure to the sleeve 15 when the NiTi alloy core rod 4 shakes. Due to the sleeve installation of the sleeve 15, the sleeve 15 applies pressure to the movable block 13 through the buffer rod 14. The movable block 13 moves along the positioning rod 12 and squeezes the buffer spring 16. The pressure is buffered by the setting of the buffer spring 16. At the same time, under the setting of the damping rod 17, the reciprocating vibration of the buffer spring 16 is avoided, and the shaking of the NiTi alloy core rod 4 during drawing causes the internal deviation of the tube blank 3. At the same time, a cleaning scraper 18 that fits the NiTi alloy core rod 4 is provided inside the sleeve 15, which can clean the NiTi alloy core rod 4 and prevent impurities on the surface of the NiTi alloy core rod 4 from affecting the shape of the inside of the tube after drawing.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PtNi alloy thin-wall tube forming method, comprising S1, preparing a tube blank; S2, drawing a long mandrel; S3, heat shrinking coring; S4, repeating processing; S5, observing the material; It is characterized in that The specific steps include: S1. Preparation of tube blank Pre-processing the material to be drawn by a known method, so that the ingot is processed into a tube blank (3); S2, long mandrel drawing Drawing the prepared tube blank (3) through a NiTi alloy core rod (4) using a long core rod drawing technology; S3, heat shrink coring The tube blank (3) obtained in S2 and the NiTi alloy core rod (4) are placed in warm water, and the NiTi alloy core rod (4) is taken out; S4, repeated processing; The tube blank (3) is again drawn through the NiTi alloy mandrel (4), and after the drawing is completed, it is again placed in warm water; S5. Observe the material; Observe the surface of the prepared pipe to check the quality of the pipe after forming; The long core rod drawing process comprises a base (1) and a drawing die (2) fixedly mounted on the upper right end of the base (1), wherein the drawing die (2) is arranged corresponding to a tube blank (3), and a NiTi alloy core rod (4) is arranged through the inside of the tube blank (3).

2. A PtNi alloy thin-wall tube forming method according to claim 1, characterized in that: The processing method used in S1 can be a machining punching method, a deep drawing method and an extrusion punching method, so that the ingot is processed to obtain a tube blank (3).

3. A PtNi alloy thin-wall tube forming method according to claim 1, characterized in that: In the S2, a NiTi alloy core rod (4) is used as a long core rod drawing tube material. The preferred NiTi alloy core rod (4) has a diameter tolerance of 0.002 mm for drawing, and the tube material is deformed by 10% to 20% in each drawing pass. The composition ratio of the NiTi alloy core rod (4) includes NiTi45 and NiTi50.

4. A PtNi alloy thin-wall tube forming method according to claim 1, characterized in that: When the tube needs to be loosened after each drawing in S3, the tube and the mandrel obtained in S2 are fixed at both ends and placed in warm water at 70°C to 100°C. The mandrel is made thinner by utilizing the "cold expansion and hot contraction" characteristics of the NiTi alloy phase change, and the mandrel can be taken out without loosening the tube.

5. A PtNi alloy thin-wall tube forming method according to claim 1, characterized in that: In S4, the processing of S2 and S3 is repeated until the PtNi alloy thin-walled tube with a size of 2.4×2.35 and a wall thickness of 0.025 mm is drawn.

6. A PtNi alloy thin-wall tube forming method according to claim 1, characterized in that: In the S5, the surface quality of the pipe is observed by a microscope, so that the quality of the pipe can be accurately checked.

7. A PtNi alloy thin-wall tube forming device for implementing claim 6, characterized in that: A servo motor (5) is fixedly mounted on the lower end of the base (1), and a bidirectional threaded rod (6) is fixedly mounted on the output end of the servo motor (5), wherein the threads at the front and rear ends of the bidirectional threaded rod (6) are opposite, and the bidirectional threaded rod (6) is rotatably mounted below the base (1) via a limiting sleeve (7), and a stopper (9) is fixedly mounted on the middle end of the bidirectional threaded rod (6).

8. A PtNi alloy thin-wall tube forming device according to claim 7, characterized in that: A positioning clamp (8) is threadedly mounted on the surface of the bidirectional threaded rod (6), and the upper end of the positioning clamp (8) is in an arc shape. The positioning clamp (8) is arranged corresponding to the tube blank (3), and a limiting rod (10) is installed through the middle end of the positioning clamp (8), and the front and rear ends of the limiting rod (10) are fixedly mounted on the inner wall of the base (1).

9. A PtNi alloy thin-wall tube forming device according to claim 8, characterized in that: A fixed platform (11) is fixedly mounted on the left upper end of the base (1), a positioning rod (12) is arranged on the upper end of the fixed platform (11), a movable block (13) is installed through the surface of the positioning rod (12), a buffer rod (14) is rotatably mounted on the upper end of the movable block (13), and a kit (15) is rotatably mounted on the upper end of the buffer rod (14).

10. A PtNi alloy thin-wall tube forming device according to claim 9, characterized in that: The kit (15) is sleeved on the outside of the NiTi alloy core rod (4), and a cleaning scraper (18) is arranged inside the kit (15), and the cleaning scraper (18) is arranged in contact with the outer wall of the NiTi alloy core rod (4). A buffer spring (16) is fixedly installed on the inner side of the movable block (13), and the inner side of the buffer spring (16) is fixedly installed on the upper end of the fixed platform (11), and a damping rod (17) is arranged at the inner center of the fixed platform (11) and the kit (15).

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