High-precision cutting device for thin-wall pipe

Abstract

The invention discloses a high-precision cutting device for a thin-wall pipe, which belongs to the technical field of machining, and is characterized in that the high-precision cutting device comprises a workbench and a cutting module, the workbench is provided with an inclined plane for supporting and guiding the pipe, the workbench is provided with a blocking part for blocking the pipe, and the blocking part is located at the lowest position of the inclined plane; two limiting seats are arranged on the workbench in a sliding mode, two driving modules are arranged on the workbench, inner supporting pieces are arranged on the two limiting seats, the two driving modules are used for driving the corresponding limiting seats to slide so that the two limiting seats can abut against the ends of the corresponding ends of the pipes respectively, and the two inner supporting pieces are inserted into inner cavities of the pipes from the corresponding end openings of the pipes respectively. The two inner supporting pieces can expand in the radial direction to tightly support the inner cavity wall of the pipe or retract in the radial direction to be away from the inner cavity wall of the pipe, a cutting channel is formed between the two inner supporting pieces in a spaced mode, the cutting channel is used for avoiding the cutting end of the cutting module, and the cutting device can effectively guarantee the cutting precision of the thin-wall pipe.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, and specifically relates to a high-precision cutting device for thin-walled tubes. Background Technology

[0002] Pipes are an indispensable basic material in construction engineering. Their quality directly determines the performance and reliability of the final pipe fittings. Different pipe fittings require the selection of corresponding pipe materials. Among the many types, thin-walled pipes are often used in situations where weight and cost control are strict due to their thinner walls, lighter weight, and material savings. However, it is precisely because of their thin walls and relatively weaker structural strength that they face significant challenges in the cutting and processing process: First, the applied pressure can easily cause the pipe end to be flattened or deformed. Second, thin-walled pipes are prone to slight displacement when subjected to force, which increases the cutting error and makes it difficult to ensure the perpendicularity of the cut end face to the pipe axis. This directly affects the assembly accuracy of thin-walled pipe fittings, making it difficult for them to meet the requirements of high-precision engineering assembly. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a high-precision cutting device for thin-walled pipes. The technical problem to be solved by this invention is: how to ensure the cutting accuracy of thin-walled pipes.

[0004] The above-mentioned technical objective of the present invention can be achieved through the following technical solution: a high-precision cutting device for thin-walled pipes, comprising a worktable and a cutting module, wherein the worktable is provided with an inclined surface for supporting and guiding the pipe, and a blocking part for blocking the pipe is provided on the worktable, the blocking part being located at the lowest point of the inclined surface; two limiting seats are slidably arranged on the worktable, and two driving modules are provided on the worktable, each of the two limiting seats being provided with an inner support member, the two driving modules being respectively used to drive the corresponding limiting seats to slide so that they respectively abut against the end of the corresponding end of the pipe, and the two inner support members are respectively inserted into the inner cavity of the pipe from the corresponding port, both of the inner support members being able to expand radially to tighten the inner wall of the pipe or retract radially to move away from the inner wall of the pipe, and a cutting channel is formed between the two inner support members, the cutting channel being used to avoid the cutting end of the cutting module.

[0005] In the above-mentioned high-precision cutting device for thin-walled pipes, a truss manipulator is provided on the worktable. The truss manipulator has two unloading jaws, which are used to clamp the corresponding pipe segments respectively. Then, in conjunction with the limiting seat, the pipe segments are detached from the corresponding inner support and transported to the unloading station.

[0006] In the above-mentioned high-precision cutting device for thin-walled pipes, the inner support includes an inner core and an outer sleeve. The outer sleeve is disposed outside the inner core, and an annular oil cavity is formed between the inner core and the outer sleeve. The inner core is provided with an oil inlet channel and an oil return channel that connect to the annular oil cavity. The outer sleeve has a deformation part. The oil in the annular oil cavity can cause the deformation part to deform and thus press against the inner wall of the pipe.

[0007] In the aforementioned high-precision cutting device for thin-walled tubes, the deformation part is made of a material with thermal conductivity and elasticity.

[0008] In the above-mentioned high-precision cutting device for thin-walled pipes, an annular scraping blade one is provided at one end of the outer sleeve, and an annular scraping blade two is provided at the other end of the outer sleeve. The cutting edges of the annular scraping blade one and the annular scraping blade two are both arranged along the axial direction of the pipe, and the cutting edges of the annular scraping blade one and the annular scraping blade two are both in contact with the inner wall of the pipe.

[0009] In the above-mentioned high-precision cutting device for thin-walled pipes, the annular scraping blade is slidably disposed on the outer sleeve, the end of the inner core is threadedly connected to a limiting ring, a spring is disposed between the annular scraping blade and the limiting ring, and a limiting end face is disposed on the outer sleeve for limiting the annular scraping blade. The annular scraping blade can slide and cooperate with the limiting ring to compress the spring, thereby causing the annular scraping blade to extend from the cutting end of the pipe section.

[0010] In the aforementioned high-precision cutting device for thin-walled pipes, a sliding cavity is provided on the outer sleeve, and a linkage part is provided on the annular scraping blade. The linkage part is slidably disposed in the sliding cavity. A control flow channel is provided on the outer sleeve, and the control flow channel is connected to the sliding cavity. When oil enters the sliding cavity through the control flow channel, it can push the linkage part to slide, thereby causing the annular scraping blade to slide and cooperate with the limiting ring to squeeze the spring.

[0011] In the above-mentioned high-precision cutting device for thin-walled pipes, an air blowing nozzle is provided on the inner core. The air blowing nozzle is connected to the air supply structure through an air supply channel, and the air blowing hole of the air blowing nozzle is aligned with the bottom of the inner wall of the pipe section.

[0012] In the above-mentioned high-precision cutting device for thin-walled pipes, the air supply structure includes an air cylinder, a piston, a first one-way valve, and a second one-way valve. The piston is slidably disposed inside the air cylinder, and the outer end of the piston extends out of the air cylinder and is connected to the limiting seat. The first one-way valve is disposed at the air inlet of the air cylinder, and the second one-way valve is disposed at the air outlet of the air cylinder. The second one-way valve is connected to the air supply channel.

[0013] In the above-mentioned high-precision cutting device for thin-walled pipes, two grating rulers are provided on the worktable, and the two grating rulers correspond to the corresponding limit seats respectively.

[0014] In summary, the advantages of this invention compared to the prior art are as follows:

[0015] 1. Automatic rolling positioning can be achieved by using the guiding effect of the inclined surface and the blocking effect of the blocking part, and by utilizing the gravity of the pipe itself. That is, automatic positioning of the pipe to be cut can be achieved without a complex power transmission structure. The structure is simple and effectively reduces equipment cost and failure rate.

[0016] 2. The pipe is limited by its own weight, the inclined surface and the blocking part, which effectively absorbs the vibration generated during cutting. In addition, the two limiting seats axially press the two ends of the pipe for positioning, so that the pipe remains highly stable during the cutting process. This also effectively avoids the surface damage of the pipe that may be caused by traditional clamping, thus effectively ensuring the cutting accuracy and surface quality of the pipe.

[0017] 3. Two internal support members provide support on both sides of the pipe to be cut, thereby enhancing the local rigidity of the pipe near the cutting area. This effectively prevents the thin-walled pipe from radially deforming or collapsing due to stress during cutting. It also effectively absorbs and offsets the impact energy generated during cutting, suppressing vibration. This not only provides some protection for the cutting blade, but also effectively ensures the flatness and smoothness of the cut end face, significantly improving the cutting quality.

[0018] 4. The elastic deformation expansion of the deformation part tightly contacts the inner wall of the pipe to achieve positioning support. It can automatically compensate for the roundness and dimensional errors of the inner diameter of the pipe, achieve high self-centering accuracy, and avoid pipe damage caused by rigid clamping, effectively ensuring the surface quality of the pipe.

[0019] 5. When the pipe is axially positioned by the two limiting seats, the first annular scraping blade can scrape the inner wall of the pipe. After the pipe section is cut and detached from the inner support, the second annular scraping blade can scrape the inner wall of the pipe again, effectively removing the burrs generated by cutting and the impurities on the inner wall of the pipe. Furthermore, by moving the limiting seats in conjunction with the air supply structure, gas is generated and delivered to the air blowing nozzle to automatically blow the scraping debris away from the inner cavity of the pipe section, ensuring that the inner cavity of the pipe section is clean. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0021] Figure 2 This is a partial cross-sectional view of an embodiment;

[0022] Figure 3 This is another partial cross-sectional view of the embodiment.

[0023] Reference numerals: 1. Workbench; 2. Inclined surface; 3. Cutting module; 4. Blocking part; 5. Limiting seat; 6. Drive module; 7. Inner support; 71. Inner core; 72. Outer sleeve; 8. Truss robot; 9. Unloading gripper; 10. Annular oil chamber; 11. Oil inlet channel; 12. Oil return channel; 13. Annular scraping blade one; 14. Annular scraping blade two; 15. Spring; 16. Limiting end face; 17. Sliding cavity; 18. Linkage part; 19. Air nozzle; 20. Air supply channel; 21. Air supply structure; 212. Air cylinder; 213. Piston; 214. First one-way valve; 215. Second one-way valve; 22. Grating ruler; 23. Control flow channel; 24. Deformation part; 25. Pipe; 26. Limiting ring; 27. Cutting channel. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] A high-precision cutting device for thin-walled tubes, such as Figures 1 to 3 As shown, it includes a workbench 1 and a cutting module 3.

[0026] The workbench 1 is equipped with an inclined surface 2 for supporting and guiding the pipe 25. The workbench 1 is also equipped with a blocking part 4 for blocking the pipe 25. The blocking part 4 is located at the lowest point of the inclined surface 2. The pipe 25 to be cut is simply placed on the inclined surface 2 and, under the guidance of the inclined surface 2, it will naturally roll towards the lowest point of the inclined surface 2 until it comes into contact with the blocking part 4. This achieves automatic positioning of the pipe 25 to be cut without the need for a complex power transmission structure. The structure is simple and effectively reduces equipment costs and failure rates. It should be further noted that the weight of the pipe 25, together with the inclined surface 2 and the blocking part 4, forms a limit on the pipe 25, which can effectively absorb the vibration generated during cutting, keeping the pipe 25 highly stable during the cutting process. This also effectively avoids the surface damage of the pipe 25 that may be caused by traditional rigid clamping, thereby ensuring the cutting accuracy and surface quality of the pipe 25.

[0027] In this embodiment, the cutting module 3 includes a rotary drive source, a cutting blade, and a lifting drive source. The rotary drive source is preferably a motor, and its output end is connected to the cutting blade. The rotary drive source is used to drive the cutting blade to rotate. The lifting drive source is preferably a hydraulic cylinder, but a pneumatic cylinder can also be used. The rotary drive source is mounted on a mounting frame, and the mounting frame is slidably mounted on a support frame through a guide structure. The guide structure can be a slide rail and a slider. The output end of the lifting drive source is connected to the mounting frame, that is, by driving the mounting frame to lift and lower, the rotary drive source and the cutting blade are driven to lift and lower to complete the cutting action of the pipe 25 to be cut.

[0028] Two limit seats 5 are slidably arranged on the worktable 1, and two drive modules 6 are arranged on the worktable 1. The two drive modules 6 are used to drive the corresponding limit seats 5 to slide so that they are respectively pressed against the end of the corresponding end of the pipe 25, thereby realizing the axial positioning of the pipe 25, ensuring the stability of the pipe 25 during the cutting process, and further ensuring the cutting accuracy of the pipe 25 and ensuring the stability of quality.

[0029] In this embodiment, the drive module 6 adopts a lead screw linear module. The two lead screw linear modules drive the corresponding limit seats 5 to slide. The two limit seats 5 slide simultaneously in opposite directions, so that the two limit seats 5 approach the corresponding end of the pipe 25 until they abut against each other or move away from the corresponding end of the pipe 25.

[0030] Two grating rulers 22 are installed on the worktable 1. The two grating rulers 22 correspond to the corresponding limit seats 5 respectively, so as to accurately detect the position of the limit seats 5 and ensure the accuracy and safety of the sliding control of the limit seats 5.

[0031] Both limiting seats 5 are provided with inner support members 7. When the two limiting seats 5 slide toward the corresponding end of the tube 25, and the two inner support members 7 are inserted into the inner cavity of the tube 25 from the corresponding port, the two inner support members 7 can expand radially to tighten the inner cavity wall of the tube 25 or retract radially to move away from the inner cavity wall of the tube 25. A cutting channel 27 is formed between the two inner support members 7. The cutting channel 27 is used to avoid the cutting end (cutting blade) of the cutting module 3.

[0032] By supporting the pipe 25 on both sides of the cutting position with two internal support members 7, the local rigidity of the pipe 25 is effectively enhanced. This not only effectively prevents the pipe 25 from deforming during the cutting process, but also effectively absorbs and offsets the impact energy generated during cutting and suppresses vibration. It not only provides a certain degree of protection for the cutting blade, but also effectively ensures the flatness and smoothness of the cut end face, significantly improving the cutting quality.

[0033] A truss robot 8 is installed on the workbench 1. The truss robot 8 has two unloading claws 9. The two unloading claws 9 are used to clamp the corresponding pipe segments, and then cooperate with the limit seat 5 to slide so that the pipe segments are separated from the inner support 7 and transported to the unloading station.

[0034] Specifically, after the pipe 25 is cut, both inner support members 7 retract radially and move away from the inner wall of the pipe 25. At the same time, the two unloading jaws 9 clamp the cut pipe segments. Then, the two drive modules 6 drive the corresponding limit seats 5, causing the two limit seats 5 to move in opposite directions, that is, the two limit seats 5 move away from the corresponding ends of the pipe 25. During this process, the two inner support members 7 are disengaged from the pipe segments under the drive of the corresponding limit seats 5. Finally, the unloading jaws 9 transport the pipe segments to the unloading station to complete the unloading operation. During the process of the unloading jaws 9 transporting the pipe segments to the unloading station, the pipe 25 to be cut is normally loaded and cut, thereby ensuring the continuity of processing and production efficiency.

[0035] The inner support 7 includes an inner core 71 and an outer sleeve 72. The outer sleeve 72 is disposed outside the inner core 71. An annular oil cavity 10 is formed between the inner core 71 and the outer sleeve 72. The inner core 71 is provided with an oil inlet channel 11 and an oil return channel 12 that connect to the annular oil cavity 10. The outer sleeve 72 has a deformation part 24. The deformation part 24 is made of a material with thermal conductivity and elasticity. The oil in the annular oil cavity 10 can cause the deformation part 24 to deform and press against the inner wall of the pipe 25.

[0036] It should be noted that, due to the elastic deformation of the deformation part 24, after the deformation part 24 expands outward, it can make close contact with the inner wall of the tube 25. This flexible contact method can fit the imperfect inner wall of the tube 25, automatically compensate for the roundness and dimensional error of the inner diameter of the tube 25, and achieve high self-centering accuracy. Even if the tube axis and the inner support 7 axis are highly coincident, it also avoids damage to the tube 25 caused by rigid clamping, effectively improving the surface quality of the tube 25.

[0037] The external oil supply unit introduces oil into the annular oil cavity 10 through the oil inlet channel 11, causing the deformation part 24 to deform and press against the inner wall of the pipe 25. After cutting, the oil in the annular oil cavity 10 flows back to the external oil supply unit through the oil return channel 12. It should be noted that, since the deformation part 24 is in close contact with the inner wall of the pipe 25 during the cutting process, and the deformation part 24 is thermally conductive, the cutting heat on the pipe 25 can be quickly transferred to the oil in the annular oil cavity 10 through the deformation part 24 for absorption. After cutting, the heated oil flows back to the external oil supply unit through the oil return channel 12, thereby removing the heat and cooling it in the oil supply unit. This effectively prevents the thermal expansion and thermal deformation caused by the local accumulation of heat in the pipe 25, thus effectively ensuring the processing accuracy of the pipe 25 and making it more suitable for cutting high-precision pipes 25 that are sensitive to temperature.

[0038] One end of the outer sleeve 72 is provided with an annular scraping blade 13. In this embodiment, the annular scraping blade 13 is slidably disposed on the outer sleeve 72. The end of the inner core 71 is threadedly connected to a limiting ring 26. A spring 15 is disposed between the annular scraping blade 13 and the limiting ring 26. The cutting edge of the annular scraping blade 13 is disposed along the axial direction of the pipe 25. The cutting edge of the annular scraping blade 13 is attached to the inner wall of the pipe 25. The outer sleeve 72 is provided with a limiting end face 16 for limiting the annular scraping blade 13. The sliding of the annular scraping blade 13 can cooperate with the limiting ring 26 to compress the spring 15, thereby causing the annular scraping blade 13 to extend from the cut end of the pipe segment.

[0039] When the two limiting seats 5 slide toward their respective ends close to the pipe 25, and the two inner support members 7 are inserted into the inner cavity of the pipe 25 from their respective ports, the annular scraping blade 13 moves along the axial direction of the pipe 25 to scrape the inner wall of the pipe 25, thereby removing burrs, oxide layers and other impurities from the inner wall, thus improving the quality of the pipe 25. It should be noted that during this process, the limiting end face 16 limits the annular scraping blade 13, ensuring the scraping effect of the annular scraping blade 13 on the inner wall of the pipe 25.

[0040] It should be noted that the outer sleeve 72 is provided with a sliding cavity 17, and the annular scraping blade 13 has a linkage part 18. The linkage part 18 is slidably disposed in the sliding cavity 17. The inner core 71 is provided with a control flow channel 23, which is connected to the sliding cavity 17. When oil enters the sliding cavity 17 through the control flow channel 23, it can push the linkage part 18 to slide, thereby causing the annular scraping blade 13 to slide and cooperate with the limiting ring 26 to compress the spring 15. It should be noted that after the cutting is completed, the external oil supply unit injects pressurized oil into the sliding cavity 17 through the control flow channel 23. At this time, under the pushing action of the pressurized oil, the linkage part 18 slides along the sliding cavity 17, thereby causing the annular scraping blade 13 to slide and cooperate with the limiting ring 26 to compress the spring 15, and extend from the cut end of the pipe section to scrape the inner wall of the cut end of the pipe section, thereby removing the impurities generated on the inner wall of the end due to cutting.

[0041] The other end of the outer sleeve 72 is provided with an annular scraping blade 14. The cutting edge of the annular scraping blade 14 is arranged along the axial direction of the tube 25. The cutting edge of the annular scraping blade 14 is close to the inner wall of the tube 25. When the two limiting seats 5 slide away from the corresponding end of the tube 25, and the two inner support members 7 disengage from the corresponding port of the tube 25, the annular scraping blade 14 moves along the axial direction of the tube 25 to scrape the inner wall of the tube 25 and the inner wall of the other end of the tube 25, thereby removing burrs, oxide layers and other impurities from the inner wall, and further improving the product quality of the tube 25.

[0042] An air blowing nozzle 19 is provided on the inner core 71. The air blowing nozzle 19 is connected to the air supply structure 21 through the air supply channel 20. The air blowing hole on the air blowing nozzle 19 is aligned with the bottom of the inner wall of the pipe section. The air supply channel 20 extends from the side wall of the limiting seat 5 and passes through the inner core 71.

[0043] The air supply structure 21 corresponds one-to-one with the limiting seat 5. The air supply structure 21 includes an air cylinder 212, a piston 213, a first one-way valve 214, and a second one-way valve 215. The piston 213 includes a piston body and a connecting rod. The piston body is slidably disposed inside the air cylinder 212. The inner end of the connecting rod is connected to the piston body, and the outer end of the connecting rod extends out of the air cylinder 212 and connects to the limiting seat 5. The outer side wall of the piston body is in contact with the inner side wall of the air cylinder 212. The first one-way valve 214 is disposed at the air inlet of the air cylinder 212, and the second one-way valve 215 is disposed at the air outlet of the air cylinder 212. The second one-way valve 215 is connected to the air supply channel 20 via a hose. (Not shown in the figure) Connected, the length of the hose must meet the travel requirements of the limit seat 5. When the two limit seats 5 slide towards the corresponding end close to the pipe 25, the limit seat 5 drives the piston body to slide along the air cylinder 212 through the connecting rod, so that the external gas enters from the first one-way valve 214. When the two limit seats 5 slide towards the corresponding end away from the pipe 25, the limit seat 5 drives the piston body to slide along the air cylinder 212 through the connecting rod, so that the high pressure gas passes through the second one-way valve 215 and the air supply channel 20 in sequence and is sprayed out from the air nozzle 19, automatically blowing the waste generated by scraping away from the inner cavity of the pipe section, ensuring that the inner cavity of the pipe section is clean.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the invention; those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A high-precision cutting device for thin-walled tubes, characterized in that: The system includes a workbench (1) and a cutting module (3). The workbench (1) has an inclined surface (2) for supporting and guiding the pipe (25). The workbench (1) also has a blocking part (4) for blocking the pipe (25), which is located at the lowest point of the inclined surface (2). Two limiting seats (5) are slidably arranged on the workbench (1). Two driving modules (6) are also arranged on the workbench (1). Each of the two limiting seats (5) has an inner support (7). The drive module (6) is used to drive the corresponding limiting seat (5) to slide so that they are respectively pressed against the end of the corresponding end of the pipe (25), and the two inner support members (7) are respectively inserted into the inner cavity of the pipe (25) from the corresponding port. Both inner support members (7) can expand radially to tighten the inner wall of the pipe (25) or retract radially to move away from the inner wall of the pipe (25). A cutting channel is formed between the two inner support members (7), and the cutting channel is used to avoid the cutting end of the cutting module (3).

2. The high-precision cutting device for thin-walled tubes according to claim 1, characterized in that: The workbench (1) is equipped with a truss manipulator (8), which has two unloading claws (9). The two unloading claws (9) are used to clamp the corresponding pipe segments, and then cooperate with the limiting seat (5) to slide so that the pipe segments are separated from the corresponding inner support (7) and transported to the unloading station.

3. A high-precision cutting device for thin-walled tubes according to any one of claims 1 or 2, characterized in that: The inner support member (7) includes an inner core (71) and an outer sleeve (72). The outer sleeve (72) is disposed outside the inner core (71). An annular oil cavity (10) is formed between the inner core (71) and the outer sleeve (72). The inner core (71) is provided with an oil inlet channel (11) and an oil return channel (12) that connect the annular oil cavity (10). The outer sleeve (72) has a deformation part (24). The oil in the annular oil cavity (10) can cause the deformation part (24) to deform and press against the inner wall of the pipe (25).

4. The high-precision cutting device for thin-walled tubes according to claim 3, characterized in that: The deformable part (24) is made of a material that is thermally conductive and elastic.

5. The high-precision cutting device for thin-walled tubes according to claim 3, characterized in that: The end of the outer sleeve (72) is provided with an annular scraping blade one (13), and the other end of the outer sleeve (72) is provided with an annular scraping blade two (14). The cutting edges of the annular scraping blade one (13) and the annular scraping blade two (14) are both arranged along the axial direction of the pipe (25), and the cutting edges of the annular scraping blade one (13) and the annular scraping blade two (14) are both attached to the inner wall of the pipe (25).

6. The high-precision cutting device for thin-walled tubes according to claim 5, characterized in that: The annular scraping blade (13) is slidably disposed on the outer sleeve (72). The end of the inner core is threadedly connected to a limiting ring (26). A spring (15) is disposed between the annular scraping blade (13) and the limiting ring (26). A limiting end face (16) for limiting the annular scraping blade (13) is disposed on the outer sleeve (72). The annular scraping blade (13) can slide and cooperate with the limiting ring (26) to squeeze the spring (15), thereby causing the annular scraping blade (13) to extend from the cutting end of the pipe section.

7. A high-precision cutting device for thin-walled tubes according to claim 6, characterized in that: The outer sleeve (72) is provided with a sliding cavity (17), and the annular scraping blade (13) has a linkage part (18). The linkage part (18) is slidably disposed in the sliding cavity (17). The outer sleeve (72) is provided with a control flow channel (23), which is connected to the sliding cavity (17). When oil enters the sliding cavity (17) through the control flow channel (23), it can push the linkage part (18) to slide, thereby causing the annular scraping blade (13) to slide and cooperate with the limiting ring (26) to squeeze the spring (15).

8. The high-precision cutting device for thin-walled tubes according to claim 7, characterized in that: The inner core (71) is provided with an air blowing nozzle (19), which is connected to the air supply structure (21) through an air supply channel (20). The air blowing hole of the air blowing nozzle (19) is aligned with the bottom of the inner wall of the pipe section.

9. A high-precision cutting device for thin-walled tubes according to claim 8, characterized in that: The air supply structure (21) includes an air cylinder (212), a piston (213), a first one-way valve (214), and a first one-way valve (215). The piston (213) is slidably disposed inside the air cylinder (212), and the outer end of the piston (213) extends out of the air cylinder (212) and is connected to the limiting seat (5). The first one-way valve (214) is disposed at the air inlet of the air cylinder (212), and the second one-way valve (215) is disposed at the air outlet of the air cylinder (212). The second one-way valve (215) is connected to the air supply channel (20).

10. A high-precision cutting device for thin-walled tubes according to claim 1, characterized in that: Two grating rulers (22) are provided on the workbench (1), and the two grating rulers (22) correspond to the corresponding limit seats (5).

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