Method for polishing inner wall of thick nickel-titanium alloy pipe

Abstract

The invention relates to a method for polishing the inner wall of a thick nickel-titanium alloy pipe, which comprises the following steps: firstly, carrying out ultrasonic decontamination cleaning and drying on the thick nickel-titanium alloy pipe to be polished, then putting the dried thick nickel-titanium alloy pipe to be polished into a rotary rigid grinding device, and filling a coarse-grained grinding medium and water into the thick nickel-titanium alloy pipe to be polished, the rotary rigid grinding device is started to roughly polish the thick nickel-titanium alloy pipe to be polished, then the thick nickel-titanium alloy pipe subjected to rough polishing is placed into the rotary flexible grinding device, and the rotary flexible grinding device is started to finely polish the thick nickel-titanium alloy pipe to be polished through the polishing solution; and finally, the nickel-titanium alloy thick pipe subjected to fine polishing is subjected to ultrasonic water cleaning and drying. The rough polishing mode of the rotary rigid grinding device and the fine polishing mode of the rotary flexible grinding device are combined to achieve automatic polishing, the inner wall defects of the nickel-titanium alloy thick pipe can be effectively removed, the surface roughness of the inner wall is reduced, and the smoothness and the polishing efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, in particular to a method for polishing the inner wall of a nickel-titanium alloy thick tube. Background Art

[0002] Nickel-titanium alloy is a shape memory alloy that can automatically restore its plastic deformation to its original shape at a certain temperature. It has excellent characteristics such as good plasticity, wear resistance, corrosion resistance, high damping and superelasticity, as well as excellent biocompatibility. It shows broad application prospects in many fields such as medical devices, aerospace, petrochemicals, etc.

[0003] The nickel-titanium alloy thick tube is a nickel-titanium alloy tube with an inner diameter of 9mm to 100mm and a wall thickness greater than or equal to 0.1mm. For nickel-titanium alloy thick tubes, which have special physical and chemical properties, the processing process is particularly complex and requires extremely high requirements. After the nickel-titanium alloy thick tube is processed to the final size, its inner wall surface usually leaves traces of machining, such as scratches, burrs, and roughness. These defects not only affect the overall aesthetics of the tube, but more importantly, they create resistance to the flow of fluid in the tube during use, increase friction and wear, and even cause unnecessary stimulation or damage to the contact position of the tube. Especially in the field of medical devices, these problems are particularly critical. Any tiny surface defects may have an adverse effect on the medical effect and even cause safety hazards. Traditional methods for processing the inner hole of nickel-titanium alloy thick tubes, including manual grinding and sandblasting, can improve the surface quality of the inner hole to a certain extent, but the traditional methods are inefficient, have poor precision, and the grinding and sandblasting processes are prone to damage the tube. Summary of the invention

[0004] Based on this, it is necessary to provide a method for polishing the inner wall of a nickel-titanium alloy thick tube in response to the above-mentioned technical problems, which has the characteristics of high efficiency, not easy to damage the tube, and can achieve uniform polishing of the inner wall of the nickel-titanium alloy thick tube and improve polishing accuracy.

[0005] The present invention provides a method for polishing the inner wall of a nickel-titanium alloy thick tube, comprising the following steps:

[0006] The nickel-titanium alloy thick tube to be polished is subjected to ultrasonic decontamination cleaning and drying;

[0007] The dried nickel-titanium alloy rough tube to be polished is placed in a rotary rigid grinding device, and a coarse-grained grinding medium and water are filled into the nickel-titanium alloy rough tube to be polished, and the rotary rigid grinding device is started to perform rough polishing on the nickel-titanium alloy rough tube to be polished;

[0008] Placing the roughly polished nickel-titanium alloy thick tube into a rotary flexible grinding device, starting the rotary flexible grinding device to perform fine polishing on the nickel-titanium alloy thick tube to be polished using a polishing liquid;

[0009] The finely polished nickel-titanium alloy thick tube is ultrasonically cleaned with water and dried.

[0010] In one embodiment, the coarse-grained grinding medium is quartz sand with a particle size of 400 to 1200 mesh, and the polishing liquid is prepared by mixing chromium oxide polishing powder, aluminum oxide polishing powder and water in a mass ratio of 1:1:5 to 10, and the particle size of the chromium oxide polishing powder and the aluminum oxide polishing powder are both 10 to 40 μm.

[0011] In one embodiment, the rotary rigid grinding device is provided with a cylindrical first liner that can be tightly sleeved on the outside of the nickel-titanium alloy thick tube to be polished, a first sleeve with a closed bottom, and an axis spiral blade assembly that can rotate around the axis of the first sleeve, the first sleeve is sleeved on the outside of the first liner, the axis of the axis spiral blade assembly is arranged inside the first liner, the axis of the axis spiral blade assembly coincides with the axis of the first sleeve, there is a gap in the horizontal direction between the axis spiral blade assembly and the inner wall of the nickel-titanium alloy thick tube to be polished, and the width of the gap is greater than the wall thickness of the nickel-titanium alloy thick tube to be polished;

[0012] In one embodiment, the rotary flexible grinding device is provided with a cylindrical second lining that can be tightly sleeved on the outside of the nickel-titanium alloy thick tube to be polished, a second sleeve with a closed bottom, and an axial cloth wheel rotating assembly that can rotate around the axis of the second sleeve. The second sleeve is sleeved on the outside of the second lining, and the axial cloth wheel rotating assembly is arranged inside the second sleeve. The axis of the axial cloth wheel rotating assembly coincides with the axis of the second sleeve, and the maximum rotation diameter of the axial cloth wheel rotating assembly is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished.

[0013] In one embodiment, both the rotary rigid grinding device and the rotary flexible grinding device are provided with a lifting mechanism, and the lifting mechanism is provided with an upper base plate, a plurality of supporting columns, a lower base plate, a guide rail, an upper lifting block and a lower lifting block;

[0014] The upper base plate and the lower base plate are parallel and aligned vertically and fixedly connected to the upper and lower ends of a plurality of supporting columns, and the guide rail is vertically fixed in the middle of the upper base plate and the lower base plate;

[0015] The upper lifting block and the lower lifting block are both sleeved on the guide rail and can slide up and down along the guide rail;

[0016] A circular groove is arranged on the top of the lower base plate, and two installation keys are arranged horizontally inside the circular groove.

[0017] In one embodiment, the heights of the first liner and the second liner are both equal to the length of the nickel-titanium alloy thick tube to be polished, the first liner and the second liner each include an upper liner and a lower liner, the upper liner is fixedly connected to the top of the lower liner, and the ratio of the height of the upper liner to the height of the lower liner is 1:16-19;

[0018] A plurality of first through holes are evenly arranged in the middle of the side wall of the lower inner liner along the axial direction, each of the first through holes vertically penetrates the side wall of the lower inner liner, a plurality of groups of second through holes are arranged in the radial direction on the side wall of the lower inner liner, the number of the groups being equal to the number of the first through holes, each group of the second through holes includes a plurality of second through holes evenly distributed in the vertical direction, each second through hole radially penetrates the side wall of the lower inner liner, and each first through hole is connected to all the second through holes in a group of the second through holes;

[0019] A groove ring is arranged in the middle of the lower part of the upper inner liner, and each first through hole is communicated with the groove ring;

[0020] The side wall of the upper liner is provided with a first air extraction hole, and the first air extraction hole is communicated with the groove ring;

[0021] The first sleeve and the second sleeve are both axially provided with a second air extraction hole, and the second air extraction hole is connected with the first air extraction hole;

[0022] The rotary rigid grinding device and the rotary flexible grinding device are both provided with an air pump, and the air pump is connected to the second air pumping hole;

[0023] The shaft spiral piece assembly and the shaft cloth wheel rotating assembly are both provided with an upper spiral shaft, a lower spiral shaft, a top sealing piece and a bottom sealing piece;

[0024] The upper spiral shaft is coaxial with the lower spiral shaft, and the top of the lower spiral shaft is threadedly connected with the bottom of the upper spiral shaft;

[0025] The top plugging piece and the bottom plugging piece are fixedly connected to the two ends of the lower spiral shaft respectively, the top plugging piece and the bottom plugging piece are perpendicular to the axis of the lower spiral shaft, and the distance between the top plugging piece and the bottom plugging piece is equal to the length of the nickel-titanium alloy thick tube to be polished;

[0026] The top blocking piece and the bottom blocking piece are both circular and have the same radius. The top blocking piece is composed of two semicircular plates, which can be detachably assembled on the lower spiral shaft.

[0027] The top end of the lower spiral shaft penetrates the top blocking piece and then extends out, and the bottom end of the lower spiral shaft penetrates the bottom blocking piece and then extends out.

[0028] In one embodiment, the shaft spiral sheet assembly is further provided with a spiral sheet sleeved on the lower spiral shaft and a plurality of fastening rods, the top of the spiral sheet is fixedly connected to the bottom of the top blocking sheet, and the bottom of the spiral sheet is fixedly connected to the top of the bottom blocking sheet;

[0029] The maximum axial radius of the spiral piece is smaller than the radius of the top plugging piece;

[0030] The middle of each fastening rod is fixedly connected to the lower spiral shaft, and both ends of each fastening rod are fixedly connected to the spiral sheet;

[0031] The rotary rigid grinding device is also provided with a first rotary motor component and a first grinding auxiliary component, the first rotary motor component is arranged above the first grinding auxiliary component, the first rotary motor component is fixedly connected to the upper lifting block, the first grinding auxiliary component is fixedly connected to the lower lifting block, the rotation axis of the rotary motor component coincides with the axis of the shaft spiral sheet assembly, and the upper spiral shaft of the shaft spiral sheet assembly is fixedly connected to the first rotary motor component;

[0032] The first grinding auxiliary component includes an auxiliary sleeve, an isolation tube, a first sealing ring and a second sealing ring, and the auxiliary sleeve abuts against the top of the first sleeve;

[0033] The auxiliary sleeve is sleeved on the outside of the isolation tube, the first sealing ring and the second sealing ring are respectively arranged at the upper and lower ends of the auxiliary sleeve, the first sealing ring and the second sealing ring are both fixedly connected to the inner wall of the auxiliary sleeve, and the upper and lower ends of the isolation tube are respectively abutted against the first sealing ring and the second sealing ring;

[0034] The top of the upper liner of the first liner abuts against the bottom of the second sealing ring.

[0035] In one embodiment, a first rotation hole is provided at the inner center of the bottom of the first sleeve, and the bottom end of the lower spiral shaft of the shaft spiral sheet assembly is inserted into the first rotation hole;

[0036] The axial radius of the circular groove of the rotary rigid grinding device is equal to the axial radius of the first sleeve. Two installation grooves that can be matched with two installation keys are set on the bottom outer side of the first sleeve. The installation keys are embedded in the installation grooves, and the first sleeve is inserted into the circular groove.

[0037] In one embodiment, the shaft cloth wheel rotating assembly is further provided with a cloth wheel sleeved on the lower spiral shaft, and the shaft radius of the cloth wheel is equal to the radius of the top blocking piece;

[0038] The top of the cloth wheel abuts against the bottom of the top blocking piece, and the bottom abuts against the top of the bottom blocking piece.

[0039] In one embodiment, the shaft cloth wheel rotating assembly is further provided with a second rotating motor component and a second grinding auxiliary component, the second rotating motor component is arranged above the second grinding auxiliary component, the second rotating motor component is fixedly connected to the upper lifting block, the second grinding auxiliary component is fixedly connected to the lower lifting block, the rotation axis of the rotating motor component coincides with the axis of the shaft cloth wheel rotating assembly, and the upper spiral shaft of the shaft cloth wheel rotating assembly is fixedly connected to the second rotating motor component;

[0040] The second grinding auxiliary member is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the second sleeve;

[0041] A circular protrusion is arranged at the bottom of the second rotating motor component, a columnar assembly cavity having a radius equal to that of the circular protrusion is arranged at the top of the second grinding auxiliary component, and the circular protrusion is assembled in the assembly cavity;

[0042] The bottom of the second grinding auxiliary member abuts against the top of the second sleeve;

[0043] A second rotating hole is provided at the inner center of the bottom of the second sleeve, and the bottom end of the lower spiral shaft of the shaft cloth wheel rotating assembly is inserted into the second rotating hole;

[0044] The axial radius of the circular groove of the rotary flexible grinding device is equal to the axial radius of the second sleeve. Two mounting grooves that can be matched with two mounting keys are arranged on the outer side of the bottom of the second sleeve. The second sleeve is inserted into the circular groove.

[0045] A support ring is provided inside the second sleeve, the outer wall of the support ring is fixedly connected to the inner wall of the second sleeve, the inner diameter of the support ring is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished, and the distance from the bottom of the support ring to the inner side of the bottom of the second sleeve is greater than the height of the second liner;

[0046] The top of the second liner abuts against the bottom of the second grinding aid member, and the bottom abuts against the top of the support ring.

[0047] The beneficial effects of the present invention are as follows: the present invention combines the coarse polishing method of the rotary rigid grinding device and the fine polishing method of the rotary flexible grinding device to realize automatic polishing, which can effectively remove the inner wall defects of the nickel-titanium alloy thick tube, reduce the inner wall surface roughness, and improve the finish and polishing efficiency. In addition, during the polishing process of the rotary rigid grinding device and the rotary flexible grinding device of the present invention, the nickel-titanium alloy thick tube can be closely attached to the first liner or the second liner, which can avoid damage to the outer wall of the tube during the polishing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic flow chart of the inner wall polishing method of a thick nickel-titanium alloy tube provided in an embodiment of the present invention;

[0049] Figure 2 It is a schematic diagram of the overall structure of the rotary rigid grinding device provided in an embodiment of the present invention;

[0050] Figure 3 This is one of the schematic cross-sectional views of the rotary rigid grinding device provided in an embodiment of the present invention along the axis of the first sleeve;

[0051] Figure 4 It is a schematic diagram of the overall structure of the rotary flexible grinding device provided in an embodiment of the present invention;

[0052] Figure 5This is one of the schematic cross-sectional views of the rotary flexible grinding device provided in an embodiment of the present invention along the axis of the first sleeve;

[0053] Figure 6 It is a structural schematic diagram of a lifting mechanism provided in an embodiment of the present invention;

[0054] Figure 7 A schematic diagram of the structure of a first liner or a second liner provided in an embodiment of the present invention;

[0055] Figure 8 One of the schematic cross-sectional structural diagrams of the first liner or the second liner provided in an embodiment of the present invention along the plane where the axis is located;

[0056] Fig. 9 It is a schematic diagram of the structure of the shaft spiral blade assembly provided in an embodiment of the present invention;

[0057] Fig.10 It is a schematic structural diagram of the shaft cloth wheel rotating assembly provided in an embodiment of the present invention;

[0058] Fig.11 This is one of the structural schematic diagrams of the first sleeve provided in an embodiment of the present invention;

[0059] Fig.12 This is a schematic diagram of the structure of the first sleeve from another angle provided in an embodiment of the present invention.

[0060] Description of reference numerals: 100, first liner; 110, first sleeve; 111, first rotating hole; 112, mounting groove; 120, shaft spiral sheet assembly; 130, first rotating motor component; 140, first grinding auxiliary component; 141, auxiliary sleeve; 142, isolation tube; 143, first sealing ring; 144, second sealing ring; 200, second liner; 210, second sleeve; 211, support ring; 220, shaft cloth wheel rotating assembly; 230, second rotating motor component; 240, second grinding auxiliary component; 300, lifting mechanism; 310, upper base plate; 320, supporting column; 330, lower base plate; 340, guide rail; 350, upper lifting block; 360, lower lifting block; 370, circular groove; 380, installation key; 400, upper lining; 410, lower lining; 420, first through hole; 430, second through hole; 440, groove ring; 450, first exhaust hole; 460, second exhaust hole; 500, upper spiral shaft; 510, lower spiral shaft; 520, top sealing piece; 530, bottom sealing piece; 540, spiral piece; 550, fastening rod; 560, cloth wheel. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0062] It should be noted that in the description of the present invention, “upper”, “lower”, “top”, “bottom”, orientation or position relationship is based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In one embodiment, Figure 1 As shown, a method for polishing the inner wall of a nickel-titanium alloy thick tube comprises the following steps:

[0064] S101, subjecting the nickel-titanium alloy thick tube to be polished to ultrasonic decontamination cleaning and drying.

[0065] Ultrasonic cleaning uses an aqueous solution of degreasing detergent as the cleaning medium, which can remove oil, impurities, etc. on the inner and outer surfaces of the pipe, making it easier for subsequent polishing.

[0066] Specifically, the degreasing detergent is a commercially available detergent, and the mixing ratio of the detergent and water is carried out according to the instructions for use of the detergent; the ultrasonic cleaning temperature is 50-80°C, and the cleaning time is 5-10 minutes; the drying temperature after cleaning is 70-85°C, and the drying time is 5-10 minutes, and the dryer is a commercially available box dryer.

[0067] S102, placing the dried nickel-titanium alloy rough tube to be polished into a rotary rigid grinding device, filling the interior of the nickel-titanium alloy rough tube to be polished with coarse-grained grinding media and water, and starting the rotary rigid grinding device to perform rough polishing on the nickel-titanium alloy rough tube to be polished.

[0068] Specifically, the coarse-grained grinding medium is quartz sand with a particle size of 400 to 1200 meshes. The rotary rigid grinding device is combined with the coarse-grained grinding medium, and during the rotational grinding, the coarse-grained grinding medium is driven to grind the inner wall of the nickel-titanium alloy thick tube to be polished, thereby removing obvious processing marks on the tube.

[0069] S103, placing the roughly polished nickel-titanium alloy thick tube into a rotary flexible grinding device, starting the rotary flexible grinding device to perform fine polishing on the nickel-titanium alloy thick tube to be polished using a polishing liquid.

[0070] The polishing liquid is prepared by mixing chromium oxide polishing powder, aluminum oxide polishing powder and water in a mass ratio of 1:1:5-10, and the particle sizes of the chromium oxide polishing powder and the aluminum oxide polishing powder are both 10-40 μm.

[0071] The chromium oxide polishing powder and aluminum oxide polishing powder in the polishing liquid are both fine abrasive particles. The rotary flexible grinding device will not cause damage to the pipe wall. The rotary flexible grinding device and the polishing liquid can achieve high-precision polishing of the inner hole surface of the pipe.

[0072] S104, the nickel-titanium alloy thick tube after fine polishing is subjected to ultrasonic water cleaning and drying. The function of ultrasonic water cleaning is to remove the polishing liquid, and after cleaning, the nickel-titanium alloy thick tube with a highly smooth inner wall surface is obtained.

[0073] like Figure 2 and Figure 3 As shown, the rotary rigid grinding device is provided with a cylindrical first liner 100 which can be tightly sleeved on the outside of the thick nickel-titanium alloy tube to be polished, a first sleeve 110 with a closed bottom, and an axial spiral blade assembly 120 which can rotate around the axis of the first sleeve 110. The first sleeve 110 is sleeved on the outside of the first liner 100, and the axial spiral blade assembly 120 is arranged inside the first liner 100. The axis of the axial spiral blade assembly 120 coincides with the axis of the first sleeve 110. There is a gap in the horizontal direction between the axial spiral blade assembly 120 and the inner wall of the thick nickel-titanium alloy tube to be polished, and the width of the gap is greater than the wall thickness of the thick nickel-titanium alloy tube to be polished.

[0074] The axis of the shaft spiral blade assembly 120 coincides with the axis of the first sleeve 110, and the first sleeve 110 is sleeved on the outside of the first liner 100, so the shaft spiral blade assembly 120 can rotate along the axis inside the first liner 100. The width of the gap is greater than the wall thickness of the nickel-titanium alloy thick tube to be polished, which can ensure that the shaft spiral blade assembly 120 will not scratch the nickel-titanium alloy thick tube during rotation.

[0075] like Figure 4 and Figure 5 As shown, the rotary flexible grinding device is provided with a cylindrical second liner 200 which can be tightly sleeved on the outside of the nickel-titanium alloy thick tube to be polished, a second sleeve 210 with a closed bottom, and an axial cloth wheel rotating assembly 220 which can rotate around the axis of the second sleeve 210. The second sleeve 210 is sleeved on the outside of the second liner 200, and the axial cloth wheel rotating assembly 220 is arranged inside the second sleeve 210. The axis of the axial cloth wheel rotating assembly 220 coincides with the axis of the second sleeve 210, and the maximum rotation diameter of the axial cloth wheel rotating assembly 220 is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished.

[0076] The shaft cloth wheel rotating assembly 220 can rotate in the second lining 200, and the polishing liquid contains polishing particles with smaller particle size. The shaft cloth wheel rotating assembly 220 plus the polishing liquid can further polish the inner wall of the nickel-titanium alloy thick tube to improve the surface finish of the inner wall.

[0077] In this embodiment, the automatic polishing is realized by combining the coarse polishing method of the rotary rigid grinding device and the fine polishing method of the rotary flexible grinding device, which can effectively remove the inner wall defects of the thick nickel-titanium alloy tube, reduce the surface roughness of the inner wall, and improve the finish and polishing efficiency. The first liner 100 and the second liner 200 can be tightly sleeved on the outside of the thick nickel-titanium alloy tube to be polished, which can avoid damage to the outer wall of the tube during the polishing process.

[0078] In one embodiment, if Figure 6 As shown, both the rotary rigid grinding device and the rotary flexible grinding device are provided with a lifting mechanism 300 , and the lifting mechanism 300 is provided with an upper base plate 310 , a plurality of supporting columns 320 , a lower base plate 330 , a guide rail 340 , an upper lifting block 350 and a lower lifting block 360 .

[0079] The upper base plate 310 and the lower base plate 330 are parallel and aligned with each other and fixedly connected to the upper and lower ends of the plurality of support columns 320, and the guide rail 340 is vertically fixed between the upper base plate 310 and the lower base plate 330. The upper lifting block 350 and the lower lifting block 360 are both sleeved on the guide rail 340 and can slide up and down along the guide rail 340. A circular groove 370 is provided on the top of the lower base plate 330, and two installation keys 380 are horizontally provided inside the circular groove 370. The depth of the circular groove 370 is half the thickness of the lower base plate 330.

[0080] Specifically, the upper base plate 310 and the lower base plate 330 of the lifting mechanism 300 of this embodiment are both rectangular metal plates, which are arranged horizontally; the lifting mechanism 300 has four supporting columns 320, which are respectively connected at the four corners of the upper base plate 310 and the lower base plate 330, and the four supporting columns 320 are perpendicular to the upper base plate 310 and the lower base plate 330. The guide rail 340 is two sliding columns, each of which is arranged between the two supporting columns 320, and the sliding column is perpendicular to the upper base plate 310 and the lower base plate 330. The upper lifting block 350 and the lower lifting block 360 both include a fixed ring and fixed ears located on both sides of the fixed ring and slidably connected to the two sliding columns. The upper lifting block 350 and the lower lifting block 360 can slide up and down along the guide rail 340.

[0081] In this embodiment, the lower lifting block 360 and the upper lifting block 350 can be moved up and down at a certain speed by motor control, and the specific motor type and structure are not limited.

[0082] In one embodiment, Figure 7 and Figure 8As shown, the heights of the first liner 100 and the second liner 200 are both equal to the length of the nickel-titanium alloy thick tube to be polished, and the first liner 100 and the second liner 200 both include an upper liner 400 and a lower liner 410, the upper liner 400 is fixedly connected to the top of the lower liner 410, and the height ratio of the upper liner 400 to the lower liner 410 is 1:16-19.

[0083] In this embodiment, the height ratio of the upper liner 400 to the lower liner 410 is specifically 1: 19. The first liner 100 and the second liner 200 are both made of acid-resistant polymer materials.

[0084] A plurality of first through holes 420 are evenly arranged along the axial direction in the middle portion of the side wall of the lower lining 410, and each first through hole 420 vertically penetrates the side wall of the lower lining 410. A plurality of groups of second through holes 430 equal in number to the first through holes 420 are arranged along the radial direction on the side wall of the lower lining 410, and each group of second through holes 430 includes a plurality of second through holes 430 evenly distributed along the vertical direction, and each second through hole 430 radially penetrates the side wall of the lower lining 410, and each first through hole 420 is connected to all the second through holes 430 in a group of second through holes 430.

[0085] Specifically, the diameters of the first through hole 420 and the second through hole 430 are both 0.5-5 mm.

[0086] A groove ring 440 is provided in the middle of the bottom of the upper liner 400, and each of the first through holes 420 is connected to the groove ring 440; a first air extraction hole 450 is provided on the side wall of the upper liner 400, and the first air extraction hole 450 is connected to the groove ring 440. The first sleeve 110 and the second sleeve 210 are both axially provided with a second air extraction hole 460, and the second air extraction hole 460 is connected to the first air extraction hole 450; the rotary rigid grinding device and the rotary flexible grinding device are both provided with an air extraction pump, and the air extraction pump is connected to the second air extraction hole 460.

[0087] In the present embodiment, the first through hole 420, the second through hole 430, the groove ring 440, the first air pumping hole 450, the second air pumping hole 460 and the air pump are all connected to form an air pumping passage. When the air pump is turned on, the nickel-titanium alloy thick tube can be tightly fitted to the inner wall surface of the first lining 100 or the second lining 200, thereby avoiding damage to the outer wall of the tube during the polishing process.

[0088] In one embodiment, if Fig. 9 and Fig.10 As shown, the shaft spiral sheet assembly 120 and the shaft cloth wheel rotating assembly 220 are both provided with an upper spiral shaft 500, a lower spiral shaft 510, a top blocking piece 520 and a bottom blocking piece 530. The upper spiral shaft 500 is coaxial with the lower spiral shaft 510, and the top of the lower spiral shaft 510 is threadedly connected to the bottom of the upper spiral shaft 500.

[0089] The top blocking piece 520 and the bottom blocking piece 530 are fixedly connected to the two ends of the lower spiral shaft 510 respectively, and the top blocking piece 520 and the bottom blocking piece 530 are perpendicular to the axis of the lower spiral shaft 510, and the distance between the top blocking piece 520 and the bottom blocking piece 530 is equal to the length of the nickel-titanium alloy thick tube to be polished;

[0090] The top blocking piece 520 and the bottom blocking piece 530 are both circular and have the same radius, so the top blocking piece 520 and the bottom blocking piece 530 can block the space between the first liner 100 or the second liner 200 during polishing to prevent the grinding medium or polishing liquid from spilling out. The top blocking piece 520 is composed of two semicircular plates, and the two semicircular plates can be detachably assembled on the lower spiral shaft 510. The top blocking piece 520 is composed of two semicircular plates, which facilitates the disassembly and assembly of the top blocking piece 520.

[0091] In this embodiment, the shaft spiral blade assembly 120 and the shaft cloth wheel rotating assembly 220 are also provided with fasteners for fixing the two semicircular plates, and the semicircular plates are fastened after the two semicircular plates are assembled to the lower spiral shaft 510.

[0092] The top end of the lower spiral shaft 510 extends out after penetrating the top blocking piece 520, and the bottom end of the lower spiral shaft 510 extends out after penetrating the bottom blocking piece 530. The top end extending part of the lower spiral shaft 510 is connected to the upper spiral shaft 500, and the bottom end extending part is connected to the lifting mechanism 300.

[0093] In one embodiment, the shaft spiral sheet assembly 120 is also provided with a spiral sheet 540 sleeved on the lower spiral shaft 510 and a plurality of fastening rods 550, the top of the spiral sheet 540 is fixedly connected to the bottom of the top sealing sheet 520, and the bottom of the spiral sheet 540 is fixedly connected to the top of the bottom sealing sheet 530; the maximum shaft radius of the spiral sheet 540 is smaller than the radius of the top sealing sheet 520; the middle of each fastening rod 550 is fixedly connected to the lower spiral shaft 510, and both ends of each fastening rod 550 are fixedly connected to the spiral sheet 540.

[0094] The function of the fastening rod 550 is to fix the spiral piece 540 and the lower spiral shaft 510 .

[0095] In one embodiment, the rotary rigid grinding device is further provided with a first rotary motor component 130 and a first grinding auxiliary component 140, the first rotary motor component 130 is arranged above the first grinding auxiliary component 140, the first rotary motor component 130 is fixedly connected to the upper lifting block 350, the first grinding auxiliary component 140 is fixedly connected to the lower lifting block 360, the rotation axis of the rotary motor component coincides with the axis of the shaft spiral sheet assembly 120, and the upper spiral shaft 500 of the shaft spiral sheet assembly 120 is fixedly connected to the first rotary motor component 130. The first rotary motor component 130 can drive the upper spiral shaft 500 of the rotary rigid grinding device to rotate.

[0096] The first grinding auxiliary component 140 includes an auxiliary sleeve 141, an isolation tube 142, a first sealing ring 143 and a second sealing ring 144. The auxiliary sleeve 141 abuts against the top of the first sleeve 110. The auxiliary sleeve 141 prevents the coarse-grained grinding medium from spilling out when the shaft spiral vane assembly 120 rotates.

[0097] The auxiliary sleeve 141 is sleeved on the outside of the isolation tube 142, and the first sealing ring 143 and the second sealing ring 144 are respectively arranged at the upper and lower ends of the auxiliary sleeve 141. The first sealing ring 143 and the second sealing ring 144 are both fixedly connected to the inner wall of the auxiliary sleeve 141, and the upper and lower ends of the isolation tube 142 are respectively abutted against the first sealing ring 143 and the second sealing ring 144; the top of the upper liner 400 of the first liner 100 is abutted against the bottom of the second sealing ring 144. The function of the first sealing ring 143 and the second sealing ring 144 is to install the isolation tube 142, and the material of the isolation tube 142 is wear-resistant material, and its function is to prevent the coarse-grained grinding medium from damaging the auxiliary sleeve 141.

[0098] The rotary motor may be disposed inside the first rotary motor component 130 to drive the upper screw shaft 500 to rotate.

[0099] In one embodiment, if Fig.11 and Fig.12 As shown, a first rotating hole 111 is provided at the inner center of the bottom of the first sleeve 110, and the bottom end of the lower spiral shaft 510 of the shaft spiral sheet assembly 120 is inserted into the first rotating hole 111;

[0100] The axial radius of the circular groove 370 of the rotary rigid grinding device is equal to the axial radius of the first sleeve 110. Two installation grooves 112 that can be matched with two installation keys 380 are set on the bottom outer side of the first sleeve 110. The installation keys 380 are embedded in the installation grooves 112, and the first sleeve 110 is inserted into the circular groove 370.

[0101] The function of the mounting key 380 and the mounting groove 112 is to prevent the first sleeve 110 from rotating relative to the lower base plate 330 .

[0102] In one embodiment, the shaft cloth wheel rotating assembly 220 is further provided with a cloth wheel 560 sleeved on the lower spiral shaft 510, and the shaft radius of the cloth wheel 560 is equal to the radius of the top blocking piece 520; the top of the cloth wheel 560 abuts against the bottom of the top blocking piece 520, and the bottom abuts against the top of the bottom blocking piece 530. The top blocking piece 520 of the shaft cloth wheel rotating assembly 220 is also provided with a fastening bolt sleeved on the lower spiral shaft 510.

[0103] The cloth wheel 560 is a cored sponge / cloth grinding wheel, the core of which is a through-hole metal structure. The cloth wheel 560 can absorb polishing liquid.

[0104] In one embodiment, the shaft cloth wheel rotating assembly 220 is further provided with a second rotating motor component 230 and a second grinding auxiliary component 240, the second rotating motor component 230 is arranged above the second grinding auxiliary component 240, the second rotating motor component 230 is fixedly connected to the upper lifting block 350, the second grinding auxiliary component 240 is fixedly connected to the lower lifting block 360, the rotation axis of the rotating motor component coincides with the axis of the shaft cloth wheel rotating assembly 220, and the upper spiral shaft 500 of the shaft cloth wheel rotating assembly 220 is fixedly connected to the second rotating motor component 230;

[0105] The second grinding auxiliary component 240 is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the second sleeve 210; a circular protrusion is provided at the bottom of the second rotating motor component 230, and a columnar assembly cavity with a radius equal to the radius of the circular protrusion is provided at the top of the second grinding auxiliary component 240, and the circular protrusion is assembled in the assembly cavity. The second grinding auxiliary component 240 and the second rotating motor component 230 are sealed and assembled through the circular protrusion and the assembly cavity to prevent the polishing liquid from spilling.

[0106] The bottom of the second grinding auxiliary component 240 is in contact with the top of the second sleeve 210; a second rotating hole is provided at the inner center of the bottom of the second sleeve 210, and the bottom end of the lower spiral shaft 510 of the shaft cloth wheel rotating assembly 220 is inserted into the second rotating hole; the axial radius of the circular groove 370 of the rotary flexible grinding device is equal to the axial radius of the second sleeve 210, and two mounting grooves 112 that can be matched with two mounting keys 380 are provided on the outer side of the bottom of the second sleeve 210, and the second sleeve 2 10 is inserted into the circular groove 370; a support ring 211 is arranged inside the second sleeve 210, the outer wall of the support ring 211 is fixedly connected to the inner wall of the second sleeve 210, the inner diameter of the support ring 211 is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished, and the distance from the bottom of the support ring 211 to the inner side of the bottom of the second sleeve 210 is greater than the height of the second liner 200; the top of the second liner 200 abuts against the bottom of the second grinding auxiliary component 240, and the bottom abuts against the top of the support ring 211.

[0107] The positional relationship between the second rotation hole and the two installation keys 380 at the bottom of the second sleeve 210 is the same as the positional relationship between the first rotation hole 111 and the two installation grooves 112 at the bottom of the first sleeve 110 .

[0108] Specifically, the space below the support ring 211 inside the second sleeve 210 is used to store the polishing liquid. The spiral piece 540 and the cloth wheel 560 can be controlled to rotate by the first rotating motor component 130 and the second rotating motor component 230 respectively.

[0109] In a specific embodiment, the inner wall polishing method of the nickel-titanium alloy thick tube to be polished is described by taking a nickel-titanium alloy thick tube with an inner diameter of 20 mm, an outer diameter of 21 mm, and a tube length of 1000 mm as an example. The inner wall polishing method of the nickel-titanium alloy thick tube in this embodiment includes the following steps:

[0110] (1) Place the nickel-titanium alloy thick tube to be polished in an ultrasonic cleaning tank, mix the degreasing detergent with water according to the instructions, raise the water temperature to 65°C, and clean for 8 minutes to remove oil, impurities, etc. on the inner and outer surfaces of the tube. The cleaned tube is placed in an 80°C oven and dried for 8 minutes.

[0111] (2) moving the upper lifting block 350 and the lower lifting block 360 of the rotary rigid grinding device, and lifting the first rotary motor component 130 and the first grinding auxiliary component 140 upward until the shaft spiral sheet assembly 120 is located in the middle of the first grinding auxiliary component 140, and the distance between the first grinding auxiliary component 140 and the first sleeve 110 is greater than 1000 mm;

[0112] Place the dried nickel-titanium alloy thick tube to be polished into the first inner liner 100, start the vacuum pump to ensure that the nickel-titanium alloy thick tube to be polished is adsorbed onto the inner wall of the first inner liner 100;

[0113] Move the lower lifting block 360 until the first grinding auxiliary member 140 is 150 mm away from the first sleeve 110;

[0114] Move the upper lifting block 350 until the bottom end of the lower spiral shaft 510 of the shaft spiral sheet assembly 120 is inserted into the first rotating hole 111;

[0115] Remove the top sealing plate of the shaft spiral blade assembly 120;

[0116] Start the first rotating motor component 130 and control the rotation speed of the spiral blade 540 to be 15 rpm;

[0117] Add water and quartz sand with a particle size of 800 meshes to the nickel-titanium alloy thick tube to be polished through the 150 mm gap between the first grinding auxiliary member 140 and the first sleeve 110 until the nickel-titanium alloy thick tube is completely filled;

[0118] Close the first rotating motor component 130 and install the top sealing piece 520 of the shaft spiral piece assembly 120;

[0119] Move the lower lifting block 360 until the first grinding auxiliary member 140 abuts against the first sleeve 110;

[0120] The first rotating motor component 130 is started to rotate at a speed of 150 rpm for 5 minutes;

[0121] Adjust the speed of the first rotating motor component 130 to 15 rpm, move the upper lifting block 350 until the shaft spiral sheet assembly 120 moves into the first grinding auxiliary component 140, and close the first rotating motor component 130;

[0122] Move the lower lifting block 360 until the first grinding auxiliary member 140 moves to a distance greater than 1000 mm from the top surface of the first sleeve 110;

[0123] Take out the nickel-titanium alloy thick tube to be polished.

[0124] (3) moving the upper lifting block 350 and the lower lifting block 360 of the rotary flexible grinding device, lifting the second rotary motor component 230 and the second grinding auxiliary component 240 upward until the cloth wheel 560 is flush with the second grinding auxiliary component 240, and the distance between the second grinding auxiliary component 240 and the second sleeve 210 is greater than 1000 mm;

[0125] The polishing liquid with a volume of V is filled in the second sleeve 210, V=π×(R1 2 -R2 2 )×(H1+H2), wherein R1 is the outer radius of the lower liner 410, R2 is the inner hole radius of the lower liner 410, H1 is the height of the lower liner 410, and H2 is the height of the upper liner 400.

[0126] Place the roughly polished nickel-titanium alloy thick tube in step (2) into the second inner liner 200, start the vacuum pump, and ensure that the nickel-titanium alloy thick tube to be polished is adsorbed onto the inner wall of the second inner liner 200;

[0127] Move the upper lifting block 350 and the lower lifting block 360 until the bottom end of the lower spiral shaft 510 of the shaft cloth wheel rotating assembly 220 is inserted into the second rotating hole, and the bottom of the second grinding auxiliary component contacts the top of the second sleeve 210. At this time, the cloth wheel 560 is completely immersed in the polishing liquid;

[0128] Start the second rotating motor component 230, control the speed of the spiral piece 540 to be 15 rpm, and continue to rotate for 3 minutes, so that the cloth wheel 560 completely absorbs the polishing liquid;

[0129] Move the upper lifting block 350 until the bottom end of the cloth wheel 560 is flush with the bottom end of the second lining 200;

[0130] Adjust the rotation speed of the second rotating motor component 230 to 150 rpm and continue rotating for 5 minutes; adjust the rotation speed of the second rotating motor component 130 to 15 rpm, move the upper lifting block 350, and after the lower end of the cloth wheel 560 is flush with the lower end of the second grinding auxiliary component 240, (the upper lifting block is not closed here) move the lower lifting block 360 until the distance between the cloth wheel 560 and the second grinding auxiliary component 240 is greater than 1000 mm away from the second sleeve 210;

[0131] Remove the thick Nitinol tube.

[0132] (4) Place the nickel-titanium alloy thick tube in an ultrasonic cleaning tank and clean it with clean water at 70°C for 8 minutes; after cleaning, dry it at 80°C for 8 minutes to remove the polishing agent attached to the inner surface of the tube, and finally obtain a nickel-titanium alloy tube with a highly polished inner wall surface.

[0133] The inner wall polishing method of the nickel-titanium alloy thick tube of this embodiment combines the rough polishing method of a rotary rigid grinding device and the fine polishing method of a rotary flexible grinding device to achieve automatic polishing, which can effectively remove inner wall defects of the nickel-titanium alloy thick tube, reduce the inner wall surface roughness, and improve the smoothness and polishing efficiency.

[0134] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A method for polishing the inner wall of a nickel-titanium alloy thick tube, characterized in that: The following steps are involved: The nickel-titanium alloy thick tube to be polished is subjected to ultrasonic decontamination cleaning and drying; Placing the dried nickel-titanium alloy rough tube to be polished into a rotary rigid grinding device, filling the interior of the nickel-titanium alloy rough tube to be polished with coarse-grained grinding media and water, and starting the rotary rigid grinding device to perform rough polishing on the nickel-titanium alloy rough tube to be polished; Placing the roughly polished nickel-titanium alloy thick tube into a rotary flexible grinding device, and starting the rotary flexible grinding device to perform fine polishing on the nickel-titanium alloy thick tube to be polished using a polishing liquid; The finely polished nickel-titanium alloy thick tube is ultrasonically cleaned with water and dried.

2. The inner wall polishing method of the nickel-titanium alloy thick tube according to claim 1, characterized in that: The coarse-grained grinding medium is quartz sand with a particle size of 400-1200 meshes. The polishing liquid is prepared by mixing chromium oxide polishing powder, aluminum oxide polishing powder and water in a mass ratio of 1:1:5-10. The particle sizes of the chromium oxide polishing powder and the aluminum oxide polishing powder are both 10-40 μm.

3. The inner wall polishing method of the nickel-titanium alloy thick tube according to claim 2, characterized in that: The rotary rigid grinding device is provided with a cylindrical first liner (100) which can be tightly sleeved on the outside of the thick nickel-titanium alloy tube to be polished, a first sleeve (110) with a closed bottom, and an axial spiral blade assembly (120) which can rotate around the axis of the first sleeve (110), wherein the first sleeve (110) is sleeved on the outside of the first liner (100), the axial spiral blade assembly (120) is arranged inside the first liner (100), the axis of the axial spiral blade assembly (120) coincides with the axis of the first sleeve (110), and there is a gap in the horizontal direction between the axial spiral blade assembly (120) and the inner wall of the thick nickel-titanium alloy tube to be polished, and the width of the gap is greater than the wall thickness of the thick nickel-titanium alloy tube to be polished.

4. The inner wall polishing method of the nickel-titanium alloy thick tube according to claim 2, characterized in that: The rotary flexible grinding device is provided with a cylindrical second liner (200) which can be tightly sleeved on the outside of the nickel-titanium alloy thick tube to be polished, a second sleeve (210) with a closed bottom, and an axial cloth wheel rotating assembly (220) which can rotate around the axis of the second sleeve (210), the second sleeve (210) is sleeved on the outside of the second liner (200), the axial cloth wheel rotating assembly (220) is arranged inside the second sleeve (210), the axis of the axial cloth wheel rotating assembly (220) coincides with the axis of the second sleeve (210), and the maximum rotation diameter of the axial cloth wheel rotating assembly (220) is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished.

5. The inner wall polishing method of a thick nickel-titanium alloy tube according to claim 4 or 3, characterized in that: The rotary rigid grinding device and the rotary flexible grinding device are both provided with a lifting mechanism (300), and the lifting mechanism (300) is provided with an upper base plate (310), a plurality of supporting columns (320), a lower base plate (330), a guide rail (340), an upper lifting block (350) and a lower lifting block (360); The upper base plate (310) and the lower base plate (330) are parallel and aligned vertically and fixedly connected to the upper and lower ends of the plurality of support columns (320), and the guide rail (340) is vertically fixed between the upper base plate (310) and the lower base plate (330); The upper lifting block (350) and the lower lifting block (360) are both sleeved on the guide rail (340) and can slide up and down along the guide rail (340); A circular groove (370) is arranged at the top of the lower base plate (330), and two installation keys (380) are arranged horizontally inside the circular groove (370).

6. The inner wall polishing method of a thick nickel-titanium alloy tube according to claim 5, characterized in that: The heights of the first liner (100) and the second liner (200) are both equal to the length of the nickel-titanium alloy thick tube to be polished, the first liner (100) and the second liner (200) both comprise an upper liner (400) and a lower liner (410), the upper liner (400) is fixedly connected to the top of the lower liner (410), and the height ratio of the upper liner (400) to the lower liner (410) is 1:16-19; A plurality of first through holes (420) are evenly arranged in the middle of the side wall of the lower liner (410) along the axial direction, each first through hole (420) vertically penetrates the side wall of the lower liner (410), and a plurality of groups of second through holes (430) are arranged in the radial direction on the side wall of the lower liner (410), the number of which is equal to the number of the first through holes (420), each group of second through holes (430) includes a plurality of second through holes (430) evenly distributed in the vertical direction, each second through hole (430) radially penetrates the side wall of the lower liner (410), and each first through hole (420) is connected to all the second through holes (430) in a group of second through holes (430); A groove ring (440) is provided in the middle of the bottom of the upper liner (400), and each first through hole (420) is connected to the groove ring (440); The side wall of the upper liner (400) is provided with a first air extraction hole (450), and the first air extraction hole (450) is communicated with the groove ring (440); The first sleeve (110) and the second sleeve (210) are both axially provided with a second air extraction hole (460), and the second air extraction hole (460) is communicated with the first air extraction hole (450); The rotary rigid grinding device and the rotary flexible grinding device are both provided with an air pump, and the air pump is connected to the second air pumping hole (460); The shaft spiral sheet assembly (120) and the shaft cloth wheel rotating assembly (220) are both provided with an upper spiral shaft (500), a lower spiral shaft (510), a top sealing sheet (520) and a bottom sealing sheet (530); The upper spiral shaft (500) and the lower spiral shaft (510) are coaxial, and the top of the lower spiral shaft (510) is threadedly connected to the bottom of the upper spiral shaft (500); The top blocking piece (520) and the bottom blocking piece (530) are respectively fixedly connected to the two ends of the lower spiral shaft (510), and the top blocking piece (520) and the bottom blocking piece (530) are both perpendicular to the axis of the lower spiral shaft (510), and the distance between the top blocking piece (520) and the bottom blocking piece (530) is equal to the length of the nickel-titanium alloy thick tube to be polished; The top blocking piece (520) and the bottom blocking piece (530) are both circular and have the same radius. The top blocking piece (520) is composed of two semicircular plates, and the two semicircular plates are detachably assembled on the lower spiral shaft (510); The top end of the lower spiral shaft (510) penetrates the top sealing piece (520) and then extends out, and the bottom end of the lower spiral shaft (510) penetrates the bottom sealing piece (530) and then extends out.

7. The inner wall polishing method of a nickel-titanium alloy thick tube according to claim 6, characterized in that: The shaft spiral sheet assembly (120) is further provided with a spiral sheet (540) sleeved on the lower spiral shaft (510) and a plurality of fastening rods (550), the top of the spiral sheet (540) being fixedly connected to the bottom of the top sealing sheet (520), and the bottom of the spiral sheet (540) being fixedly connected to the top of the bottom sealing sheet (530); The maximum axial radius of the spiral piece (540) is smaller than the radius of the top sealing piece (520); The middle of each fastening rod (550) is fixedly connected to the lower spiral shaft (510), and both ends of each fastening rod (550) are fixedly connected to the spiral sheet (540).

8. The inner wall polishing method of a thick nickel-titanium alloy tube according to claim 7, characterized in that: The rotary rigid grinding device is also provided with a first rotary motor component (130) and a first grinding auxiliary component (140), wherein the first rotary motor component (130) is arranged above the first grinding auxiliary component (140), the first rotary motor component (130) is fixedly connected to an upper lifting block (350), the first grinding auxiliary component (140) is fixedly connected to a lower lifting block (360), the rotation axis of the rotary motor component coincides with the axis of the shaft spiral sheet assembly (120), and the upper spiral shaft (500) of the shaft spiral sheet assembly (120) is fixedly connected to the first rotary motor component (130); The first grinding auxiliary component (140) comprises an auxiliary sleeve (141), an isolation tube (142), a first sealing ring (143) and a second sealing ring (144); the auxiliary sleeve (141) abuts against the top of the first sleeve (110); The auxiliary sleeve (141) is sleeved on the outside of the isolation tube (142); the first sealing ring (143) and the second sealing ring (144) are respectively arranged at the upper and lower ends of the auxiliary sleeve (141); the first sealing ring (143) and the second sealing ring (144) are both fixedly connected to the inner wall of the auxiliary sleeve (141); and the upper and lower ends of the isolation tube (142) are respectively abutted against the first sealing ring (143) and the second sealing ring (144); The top of the upper liner (400) of the first liner (100) abuts against the bottom of the second sealing ring (144); A first rotating hole (111) is provided at the inner center of the bottom of the first sleeve (110), and the bottom end of the lower spiral shaft (510) of the shaft spiral sheet assembly (120) is inserted into the first rotating hole (111); The axial radius of the circular groove (370) of the rotary rigid grinding device is equal to the axial radius of the first sleeve (110), and two installation grooves (112) that can be matched with two installation keys (380) are arranged on the outer side of the bottom of the first sleeve (110), and the installation keys (380) are embedded in the installation grooves (112), and the first sleeve (110) is inserted into the circular groove (370).

9. The inner wall polishing method of a nickel-titanium alloy thick tube according to claim 6, characterized in that: The shaft cloth wheel rotating assembly (220) is further provided with a cloth wheel (560) sleeved on the lower spiral shaft (510), and the shaft radius of the cloth wheel (560) is equal to the radius of the top blocking piece (520); The top of the cloth wheel (560) abuts against the bottom of the top sealing piece (520), and the bottom abuts against the top of the bottom sealing piece (530).

10. The inner wall polishing method of a thick nickel-titanium alloy tube according to claim 9, characterized in that: The shaft cloth wheel rotating assembly (220) is also provided with a second rotating motor component (230) and a second grinding auxiliary component (240); the second rotating motor component (230) is arranged above the second grinding auxiliary component (240); the second rotating motor component (230) is fixedly connected to the upper lifting block (350); the second grinding auxiliary component (240) is fixedly connected to the lower lifting block (360); the rotation axis of the rotating motor component coincides with the axis of the shaft cloth wheel rotating assembly (220); and the upper spiral shaft (500) of the shaft cloth wheel rotating assembly (220) is fixedly connected to the second rotating motor component (230); The second grinding auxiliary component (240) is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the second sleeve (210); The second rotating motor component (230) is provided with a circular protrusion at the bottom, and the second grinding auxiliary component (240) is provided with a columnar assembly cavity having a radius equal to the radius of the circular protrusion at the top, and the circular protrusion is assembled in the assembly cavity; The bottom of the second grinding auxiliary member (240) abuts against the top of the second sleeve (210); A second rotating hole is provided at the inner center of the bottom of the second sleeve (210), and the bottom end of the lower spiral shaft (510) of the shaft cloth wheel rotating assembly (220) is inserted into the second rotating hole; The axial radius of the circular groove (370) of the rotary flexible grinding device is equal to the axial radius of the second sleeve (210); two mounting grooves (112) are arranged on the outer side of the bottom of the second sleeve (210) and can be matched with two mounting keys (380) respectively; the second sleeve (210) is inserted into the circular groove (370); A support ring (211) is provided inside the second sleeve (210), the outer wall of the support ring (211) is fixedly connected to the inner wall of the second sleeve (210), the inner diameter of the support ring (211) is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished, and the distance from the bottom of the support ring (211) to the inner side of the bottom of the second sleeve (210) is greater than the height of the second liner (200); The top of the second liner (200) abuts against the bottom of the second grinding auxiliary member (240), and the bottom abuts against the top of the support ring (211).

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