Precise polishing device and method for inner wall of ultra-slender pipe

Abstract

The invention discloses a precise polishing device and method for the inner wall of an ultra-slender pipe. The precise polishing device for the inner wall of the ultra-slender pipe comprises a base, a pipe axial moving unit, a supporting plate, a pipe clamping unit, a pipe bending prevention and vibration reduction unit, a polishing wheel and a polishing wheel fixing unit. The pipe axial moving unit is mounted in the middle of the base; the supporting plate is fastened on the pipe axial moving unit; the two pipe clamping units are symmetrically installed at the two ends of the supporting plate. The pipe bending prevention and vibration reduction unit is mounted in the middle of the supporting plate; the two polishing wheel fixing units are symmetrically installed at the two ends of the base. The defect layer on the inner wall of the pipe can be effectively removed by adopting a mechanical and chemical composite polishing method; the device is provided with the pipe bending prevention and vibration reduction unit, upward bending and vibration of the pipe in the machining process can be effectively restrained, the machining stress is reduced, and the uniformity of removal of materials on the inner wall of the pipe is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of mirror polishing, in particular to the inner wall polishing of ultra-slender pipes. Background Art

[0002] With the improvement of medical level, slender thin-walled tubes are widely used in needles, vascular stents and fluid transportation of high-precision medical devices. At present, slender tubes are mostly manufactured by drawing process, and the plastic deformation of the inner wall of the thin tube during the drawing process leads to a rough surface. The rough inner wall not only reduces its service life but also affects the stability of fluid transportation and greatly affects its performance. Different application fields have different performance requirements for slender thin-walled tubes, but they all expect their inner surface to be smooth enough. Due to the large aspect ratio, it is difficult to remove the inner wall material with traditional polishing process. Seeking new technology for high surface quality processing of the inner wall of slender thin-walled tubes is of great significance in improving the welfare of patients and reducing the medical burden.

[0003] Chinese patent CN2756647Y proposes an electrochemical polishing device for the inner wall of a slender tube. The tube is placed horizontally in an electrolyte tank and connected to a tube rotator. Cables are connected to both ends of the cathode. The left cable is connected to a DC power supply via a guide wheel and a driver. The cathode is placed in the tube, and the right cable is connected to the driver via a guide wheel. The anode is connected to a DC power supply and connected to the outer wall of the tube by friction contact. The power is turned on to start the tube rotator and the driver. The cathode moves back and forth at a uniform speed in the tube. The electrolyte undergoes an oxidation-reduction reaction with the surface layer of the inner wall of the tube. A polishing head is fixed in the middle of the cathode. The polishing of the inner wall of the tube is achieved under the combined action of the polishing head and the electrochemical reaction. The device can effectively remove the defective layer on the surface of the tube, but due to the limitation of the tube length, the electrolyte in the tube is difficult to circulate effectively, and the polishing efficiency is low.

[0004] Chinese patent CN102211295A proposes a magnetorheological polishing device and method for the inner wall of a capillary. The upper and lower ends of the base of the device are each provided with a magnetorheological fluid injection device. A magnetic field controller and a vibration device are fixed inside the base. The capillary is fixed by magnetorheological fluid injectors at both ends and passes through the magnetic field controller and the vibration device inside the base. Under the combined action of the electromagnetic field and the vibration device, the magnetorheological fluid generates a soft columnar polishing film on the inner wall of the capillary. The magnetic field controller is driven to make the columnar polishing mold rotate around the capillary and move axially to achieve polishing of the inner wall of the tube. The device drives the magnetic abrasive particles injected into the capillary by an electromagnet for grinding. The removal of the inner wall material of the tube is relatively uniform but the efficiency is very low, and the sealing performance and pressure supply system of the device are required to be high.

[0005] Chinese patent CN206632769U proposes a device for polishing the inner wall of a long and thin tube with a large aspect ratio, which belongs to the field of magnetic grinding. The chuck fastens the ultrasonic generator to rotate, one end of the thin tube is connected to the ultrasonic generator, and the other end is connected to the bearing opposite to the chuck. The ultrasonic generator makes the thin tube do radial runout, and the external grinding device is composed of two magnetic poles placed at 90 degrees to make axial reciprocating motion. The cylindrical magnetic pole is placed inside the thin tube and cooperates with the external magnetic pole. Magnetic abrasive is loaded between the cylindrical magnetic pole and the tube wall. The device introduces ultrasonic vibration on the basis of traditional magnetic grinding, so that the abrasive particles impact the inner wall of the thin tube, which increases the amount of material removal, but the cost is high, and the matching of the pressure and ultrasonic vibration is difficult.

[0006] Chinese patent CN116713889A proposes a cavitation polishing device and method for the inner wall of a slender tube. The device places a magnetic hollow tube inside the processed tube, so that the flow channel in the slender tube forms a typical Venturi tube structure. The two ends of the tube are connected to high-voltage generating units filled with polishing liquid. The polishing liquid passes back and forth through the magnetic hollow tube under the action of the high-voltage generating units at both ends, so that a section of the end area undergoes cavitation and generates high-temperature and high-pressure impact to remove the inner wall material of the tube. The outer part of the tube is surrounded by a movable magnetic pole device, which can control the movement of the magnetic hollow tube to change the processing area. The device has a high polishing efficiency and uniform removal of the inner wall material of the tube, but the sealing requirements of the device are very high. The burden borne by the high-voltage generating unit is proportional to the length of the tube, and it is difficult to achieve high surface quality processing of the inner wall of ultra-slender tubes.

[0007] The above patents and others have the defects of low efficiency, heavy burden, high cost and difficulty in control in the processing of ultra-slender tubes. Therefore, there is an urgent need for a device and method for high surface quality processing of the inner wall of ultra-slender tubes. Summary of the invention

[0008] In view of the problem of polishing the inner wall of ultra-slender tubes, the inventors have invented a device and method for precision polishing the inner wall of ultra-slender tubes to solve the problems of low efficiency, unevenness, and insufficiency in removing the inner wall material of ultra-slender tubes. The present invention adopts the following technical solutions:

[0009] A device for precisely polishing the inner wall of an ultra-slender tube, characterized in that it comprises a base (1), a tube axial moving unit (2), a support plate (3), a tube clamping unit (4), a tube anti-bending and vibration-damping unit (5), a polishing wheel (7), and a polishing wheel fixing unit (8); the base (1) is provided with a plurality of axially parallel grooves; the tube axially moving unit (2) is mounted in the middle of the base (1); the support plate (3) is fastened to the tube axially moving unit (2) and two axially parallel grooves are respectively arranged at both ends of the support plate (3); the tube clamping unit (4) has two axially parallel grooves symmetrically mounted on the two ends of the support plate (3); the tube anti-bending and vibration-damping unit (5) is mounted in the middle of the support plate (3); the polishing wheel fixing unit (8) has two axially parallel grooves symmetrically mounted on the base (1) and located at both ends; the polishing wheel (7) comprises units for the ultra-slender tube in the thinning and fine polishing stages, and both can be fixed to the polishing wheel fixing unit (8) by a thin steel wire rope.

[0010] The pipe axial moving unit (2) is composed of a synchronous belt guide rail (201), a synchronous belt (202), a slide (203), a motor flange seat (204), a coupling (205) and a stepper motor (206); the two ends of the synchronous belt guide rail (201) are fixed to the base (1) through a tripod; the synchronous belt (202) is installed on the synchronous belt guide rail (201) and connected to the pulley; the slide (203) is connected to the synchronous belt guide rail (201) and is fastened to the synchronous belt (202); the stepper motor (206) is fixed to the right end of the synchronous belt guide rail (201) through the motor flange seat (204) and is connected to the coupling (205), and the driving pulley drives the synchronous belt (202) to move; the synchronous belt (202) drives the slide (203) to make reciprocating axial motion on the synchronous belt guide rail (201).

[0011] The pipe clamping unit (4) comprises a hollow stepping motor (401), a motor base (402), and a precision chuck (403); the precision chuck (403) is fastened to the rotating shaft of the hollow stepping motor (401); the motor base (402) is mounted on an axially parallel groove at the end of a support plate (3); the hollow stepping motor (401) is fixedly mounted on the motor base (402); the pipe (6) is clamped by the precision chuck (403) and rotates synchronously with the stepping motor (401); the motor support plate (402) can move along the axially parallel groove at the end of the support plate (3) to achieve the tightening of the pipe (6) and the clamping of pipes of different lengths.

[0012] The pipe anti-bending vibration reduction unit (5) is composed of an arc baffle (501), an L-shaped frame (502) and a z-axis translation platform; wherein the z-axis translation platform is composed of a z-axis translation platform slide (503), a locking knob (504), a z-axis translation platform slide rail (505), a z-axis translation platform base (506), a knob (507), a threaded push rod (508) and a V-shaped connecting rod (509); the z-axis translation platform is installed in the middle of the support plate (3) The L-shaped frame (502) is fixed on the slide (503) of the z-axis translation stage; the arc baffle (501) is fastened on the L-shaped frame (502), and the axis of the rotating shaft of the hollow stepping motor (401) and the arc center of the arc baffle (501) are in the same vertical plane; after the pipe (6) is clamped and tightened, the knob (507) is turned to make the inner wall of the arc baffle (501) and the outer wall of the pipe (6) frictionally contact to suppress the subsequent processing and cause the pipe to bend and vibrate.

[0013] The polishing wheel fixing unit (8) is composed of a manual translation platform, a translation platform bracket (808), an L-shaped support plate (809), a motor base (810), a stepping motor (811) and a wire hook (812); wherein the manual translation platform comprises a rocker (801), a coupling (802), a manual translation platform base (803), a screw guide rail (804), a screw (805), a manual translation platform slide (806) and a slide guide rail (807); the translation platform bracket (808) is mounted on an axially parallel groove of the base (1) and is located at the end; the manual translation platform is fixed on the translation platform bracket (808) and is guided perpendicular to the upper surface of the base (1); the L-shaped support plate (809) ) is fixed on the manual translation stage slide (806); the motor base (810) is fixed on the L-shaped support plate (809); the stepping motor (811) is fixedly mounted on the motor base (810); the wire hook (812) is fastened to the rotating shaft of the stepping motor (811); the two ends of the polishing wheel (7) are fastened to the wire hook (812) by means of thin steel wire ropes and rotate synchronously with the stepping motor (811), so that the cutting edge of the polishing wheel (7) is continuously updated; the translation stage bracket (808) can translate along the axial parallel groove of the base (1) to achieve the tightening of the polishing wheel (7); the radial displacement of the polishing wheel (7) can be controlled by rotating the rocker (801) to change the pressing force between the polishing wheel (7) and the inner wall of the pipe (6).

[0014] The polishing wheel (7) comprises units for thinning and fine polishing of ultra-thin tubes; wherein the thinning unit is a diamond grinding wheel with a base diameter of 1 mm and a length of 400 mm, the diamond abrasive grains are fixed to the surface of the base by high-temperature plasma torch brazing, the abrasive grain fixing area is 300 mm long, the base is 304 hard straight steel wire, and micro holes and micro grooves are machined at both ends by electric sparks; the fine polishing unit is a wool felt wheel with a base diameter of 1 mm and a length of 400 mm, the wool felt is coated on the base by an adhesive, the coating area is 300 mm long, the base is 304 hard straight steel wire, and micro holes and micro grooves are machined at both ends by electric sparks; the diamond grinding wheel is first used to remove original defects such as convex peaks, pits and cracks on the inner wall of the tube, and then the wool felt wheel is used to remove scratches produced by the diamond grinding wheel processing, so as to achieve high surface quality processing of the inner wall of the tube.

[0015] Furthermore, the arc baffle (501) is made of rubber material, which can effectively alleviate the vibration of the pipe during the processing process. The inner wall of the arc baffle (501) is coated with rubber grease to reduce the wear on the outer wall of the pipe.

[0016] Furthermore, the polishing liquid can chemically corrode the inner wall of the capillary tube to form a passivation film that is conducive to cutting. Different types of polishing liquids can be selected according to different materials.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The pipe anti-bending and vibration reduction unit (5) is used to effectively suppress the bending and vibration of the pipe during processing, reduce processing stress, and ensure uniform removal of material from the inner wall of the pipe.

[0019] 2. The polishing wheel has sufficient pressing force on the inner wall of the pipe, which can ensure the sufficient removal of material from the inner wall of the pipe.

[0020] 3. The polishing wheel includes a unit for thinning and fine polishing of ultra-slender tubes. First, a diamond grinding wheel is used to remove the defective layer on the inner wall of the tube, and then a wool felt wheel is used to remove the scratches caused by rough grinding to achieve high surface quality processing of the inner wall of the tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention, wherein: 1-base, 2-tube axial moving unit, 3-support plate, 4-tube clamping unit, 5-tube anti-bending and vibration reduction unit, 6-tube, 7-polishing wheel, 8-polishing wheel fixing unit.

[0022] Figure 2 It is a structural schematic diagram of the pipe axial moving unit, wherein: 201-synchronous belt guide rail, 202-synchronous belt, 203-slide table, 204-motor flange seat, 205-coupling, 206-stepping motor.

[0023] Figure 3It is a structural schematic diagram of the pipe clamping unit, wherein: 401-hollow stepper motor, 402-motor support plate, 403-precision chuck.

[0024] Figure 4 It is the front view of the pipe anti-bending and vibration reduction unit, wherein: 501-arc baffle, 502-L-shaped bracket, 503-z-axis translation stage slide, 504-locking knob, 505-z-axis translation stage slide guide rail, 506-z-axis translation stage base, 507-knob, 508-threaded push rod, 509-V-shaped connecting rod.

[0025] Figure 5 Schematic diagram of the polishing wheel.

[0026] Figure 6 It is a structural schematic diagram of the polishing wheel fixing unit, wherein: 801-manual rocker, 802-coupling, 803-manual translation stage base, 804-screw guide rail, 805-screw, 806-manual translation stage slide, 807-slide guide rail, 808-translation stage bracket, 809-L-shaped support plate, 810-motor base, 811-stepping motor, 812-wire hook. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, the overall structure of the present invention comprises a base (1), a tube axial moving unit (2), a support plate (3), a tube clamping unit (4), a tube anti-bending and vibration-damping unit (5), a polishing wheel (7), and a polishing wheel fixing unit (8); the base (1) is provided with a plurality of axial parallel grooves; the tube axial moving unit (2) is mounted in the middle of the base (1); the support plate (3) is fastened to the tube axial moving unit (2) and two axial parallel grooves are respectively arranged at both ends of the support plate (3); the tube clamping unit (4) has two axial parallel grooves symmetrically mounted on the two ends of the support plate (3); the tube anti-bending and vibration-damping unit (5) is mounted in the middle of the support plate (3); the polishing wheel fixing unit (8) has two axial parallel grooves symmetrically mounted on the base (1) and located at both ends; the polishing wheel (7) comprises units for ultra-slender tubes used in thinning and fine polishing stages, and both can be fixed to the polishing wheel fixing unit (8) by fine steel wire ropes.

[0029] like Figure 2As shown, the pipe axial movement unit (2) is composed of a synchronous belt guide rail (201), a synchronous belt (202), a slide (203), a motor flange seat (204), a coupling (205) and a stepper motor (206); both ends of the synchronous belt guide rail (201) are fixed to the base (1) through a tripod; the synchronous belt (202) is installed on the synchronous belt guide rail (201) and connected to the pulley; the slide (203) is connected to the synchronous belt guide rail (201) and is fastened to the synchronous belt (202); the stepper motor (206) is fixed to the right end of the synchronous belt guide rail (201) through the motor flange seat (204) and is connected to the coupling (205), and the driving pulley drives the synchronous belt (202) to move; the synchronous belt (202) drives the slide (203) to make reciprocating axial motion on the synchronous belt guide rail (201).

[0030] like Figure 3 As shown, the pipe clamping unit (4) includes a hollow stepping motor (401), a motor base (402), and a precision chuck (403); the precision chuck (403) is fastened to the rotating shaft of the hollow stepping motor (401); the motor base (402) is mounted on the axial parallel groove at the end of the support plate (3); the hollow stepping motor (401) is fixedly mounted on the motor base (402); the pipe (6) is clamped by the precision chuck (403) and rotates synchronously with the stepping motor (401); the motor support plate (402) can move along the axial parallel groove at the end of the support plate (3) to achieve the tightening of the pipe (6) and the clamping of pipes of different lengths.

[0031] like Figure 4 As shown, the pipe anti-bending device (5) is composed of an arc baffle (501), an L-shaped frame (502) and a z-axis translation platform; wherein the z-axis translation platform is composed of a z-axis translation platform slide (503), a locking knob (504), a z-axis translation platform slide rail (505), a z-axis translation platform base (506), a knob (507), a threaded push rod (508) and a V-shaped connecting rod (509); the z-axis translation platform is installed in the middle of the support plate (3); The L-shaped frame (502) is fixed on the slide (503) of the z-axis translation stage; the arc baffle (501) is fastened on the L-shaped frame (502), and the axis of the rotating shaft of the hollow stepping motor (401) and the arc center of the arc baffle (501) are in the same vertical plane; after the pipe (6) is clamped and tightened, the knob (507) is rotated to make the inner wall of the arc baffle (501) and the outer wall of the pipe (6) contact with each other by friction, thereby suppressing the bending and vibration of the pipe caused by subsequent processing.

[0032] like Figure 5As shown, the polishing wheel fixing unit (8) is composed of a manual translation stage, a translation stage bracket (808), an L-shaped support plate (809), a motor base (810), a stepping motor (811) and a wire hook (812); wherein the manual translation stage comprises a rocker (801), a coupling (802), a manual translation stage base (803), a screw guide rail (804), a screw (805), a manual translation stage slide (806), and a slide guide rail (807); the translation stage bracket (808) is mounted on an axially parallel groove of the base (1) and is located at the end; the manual translation stage is fixed on the translation stage bracket (808) and is guided perpendicular to the upper surface of the base (1); the L-shaped support plate (80 9) is fixed on the manual translation stage slide (806); the motor base (810) is fixed on the L-shaped support plate (809); the stepping motor (811) is fixedly installed on the motor base (810); the wire hook (812) is fastened to the rotating shaft of the stepping motor (811); the two ends of the polishing wheel (7) are fastened to the wire hook (812) by thin steel wire ropes and rotate synchronously with the stepping motor (811), so that the cutting edge of the polishing wheel (7) is continuously updated; the translation stage bracket (808) can translate along the axial parallel groove of the base (1) to realize the tightening of the polishing wheel (7); the radial displacement of the polishing wheel (7) can be controlled by rotating the rocker (801) to change the pressing force between the polishing wheel (7) and the inner wall of the pipe (6).

[0033] The steps for polishing the inner wall of ultra-slender pipes are as follows:

[0034] Step 1: Turn the rocker (801) to adjust the rotating shaft of the stepper motor (811) to be concentric with the rotating shaft of the hollow stepper motor (401), and use a thin steel wire rope to wrap around the micro holes at both ends of the diamond grinding wheel and lead it out along the micro groove to prevent the thin steel wire rope from damaging the inner wall of the pipe during subsequent processing. The thin steel wire rope led out from the left end is fixed on the wire hook (812-1) and set aside after fixing.

[0035] Step 2: adjust the spacing between the precision chucks (403-1, 403-2) according to the needs of the processed pipe, pass the pipe (6) horizontally through the lower part of the arc baffle (501) from the right side of the center hole of the hollow stepper motor (401-2) so that it contacts the precision chuck (403-1), adjust the position of the pipe (6) and then adjust the precision chuck (403) to clamp the pipe, and move the motor support plate (402) to tighten the pipe (6).

[0036] Step 3: Turn the knob (507) to make the inner wall of the arc baffle (501) frictionally contact with the outer wall of the tube (6), and turn the locking knob (504) to lock the z-axis translation stage to suppress the bending and vibration of the tube caused by subsequent processing.

[0037] Step 4: Pull the thin steel wire rope at the right end of the diamond grinding wheel through the left side of the center hole of the hollow stepper motor (401-1) through the pipe (6) and fix it on the wire hook (812-2). The fixing method is consistent with the above-mentioned left end fixing method. After the diamond grinding wheel is fixed, move the translation stage bracket (808) to tighten the diamond grinding wheel, and turn the rocker (801) to adjust the contact strength between the diamond grinding wheel and the inner wall of the pipe (6).

[0038] Step 5: injecting polishing liquid into the interior of the pipe (6) to fully corrode the defective layer on the inner wall of the pipe.

[0039] Step 6: Start the control system, and the control system controls the hollow stepper motor (401) and the stepper motor (811) to drive the pipe (6) and the diamond grinding wheel to rotate, and at the same time controls the pipe axial movement unit (2) to drive the pipe (6) to reciprocate axial movement, so as to remove the defective layer on the inner wall of the pipe (6) and complete the thinning stage processing.

[0040] Step 7. Use a wool felt wheel to replace the diamond grinding wheel to perform fine polishing on the inner wall of the pipe to remove scratches caused by the diamond grinding wheel. The processing process is the same as that in the thinning stage.

[0041] It should be further explained in the description of the present invention that the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", "parallel", "vertical", "middle", "horizontal" and "vertical" are based on the positional relationships shown in the drawings and are only for the convenience of description, and do not indicate or imply that the original component or device referred to must have a specific direction, be constructed or operate in a specific direction.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "install", "fasten" and "fix" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A device for precision polishing the inner wall of an ultra-slender tube, characterized in that: The invention comprises a base (1), a tube axial moving unit (2), a support plate (3), a tube clamping unit (4), a tube anti-bending and vibration-damping unit (5), a polishing wheel (7), and a polishing wheel fixing unit (8); the base (1) is provided with a plurality of axial parallel grooves; the tube axial moving unit (2) is installed in the middle of the base (1); the support plate (3) is fastened to the tube axial moving unit (2) and two axial parallel grooves are respectively provided at both ends of the support plate (3); the tube clamping unit (4) has two axial parallel grooves symmetrically installed on the two ends of the support plate (3); the tube anti-bending and vibration-damping unit (5) is installed in the middle of the support plate (3); the polishing wheel fixing unit (8) has two axial parallel grooves symmetrically installed on the base (1) and located at both ends; the polishing wheel (7) comprises units for ultra-slender tubes used in thinning and fine polishing stages, and both can be fixed to the polishing wheel fixing unit (8) by thin steel wire ropes; The pipe axial moving unit (2) is composed of a synchronous belt guide rail (201), a synchronous belt (202), a slide (203), a motor flange seat (204), a coupling (205) and a stepper motor (206); both ends of the synchronous belt guide rail (201) are fixed to the base (1) through a tripod; the synchronous belt (202) is installed on the synchronous belt guide rail (201) and connected to the pulley; the slide (203) is connected to the synchronous belt guide rail (201) and is fastened to the synchronous belt (202); the stepper motor (206) is fixed to the right end of the synchronous belt guide rail (201) through the motor flange seat (204) and is connected to the coupling (205), and the driving pulley drives the synchronous belt (202) to move; the synchronous belt (202) drives the slide (203) to make reciprocating axial motion on the synchronous belt guide rail (201); The pipe clamping unit (4) comprises a hollow stepping motor (401), a motor base (402), and a precision chuck (403); the precision chuck (403) is fastened to the rotating shaft of the hollow stepping motor (401); the motor base (402) is mounted on the axial parallel groove at the end of the support plate (3); the hollow stepping motor (401) is fixedly mounted on the motor base (402); the pipe (6) is clamped by the precision chuck (403) and rotates synchronously with the stepping motor (401); the motor support plate (402) can move along the axial parallel groove at the end of the support plate (3) to achieve the tightening of the pipe (6) and the clamping of pipes of different lengths; The pipe anti-bending vibration reduction unit (5) is composed of an arc baffle (501), an L-shaped frame (502) and a z-axis translation platform; wherein the z-axis translation platform is composed of a z-axis translation platform slide (503), a locking knob (504), a z-axis translation platform slide rail (505), a z-axis translation platform base (506), a knob (507), a threaded push rod (508) and a V-shaped connecting rod (509); the z-axis translation platform is installed in the middle of the support plate (3) The L-shaped frame (502) is fixed on the slide (503) of the z-axis translation stage; the arc baffle (501) is fastened on the L-shaped frame (502), and the axis of the rotating shaft of the hollow stepping motor (401) and the arc center of the arc baffle (501) are in the same vertical plane; after the pipe (6) is clamped and tightened, the knob (507) is turned to make the inner wall of the arc baffle (501) and the outer wall of the pipe (6) contact with each other by friction, so as to suppress the bending and vibration of the pipe caused by subsequent processing; The polishing wheel fixing unit (8) is composed of a manual translation platform, a translation platform bracket (808), an L-shaped support plate (809), a motor base (810), a stepping motor (811) and a wire hook (812); wherein the manual translation platform comprises a rocker (801), a coupling (802), a manual translation platform base (803), a screw guide rail (804), a screw (805), a manual translation platform slide (806) and a slide guide rail (807); the translation platform bracket (808) is mounted on an axially parallel groove of the base (1) and is located at the end; the manual translation platform is fixed on the translation platform bracket (808) and is guided perpendicular to the upper surface of the base (1); the L-shaped support plate (809) ) is fixed on the manual translation stage slide (806); the motor base (810) is fixed on the L-shaped support plate (809); the stepping motor (811) is fixedly mounted on the motor base (810); the wire hook (812) is fastened to the rotating shaft of the stepping motor (811); the two ends of the polishing wheel (7) are fastened to the wire hook (812) by thin steel wire ropes and rotate synchronously with the stepping motor (811), so that the cutting edge of the polishing wheel (7) is continuously updated; the translation stage bracket (808) can translate along the axial parallel groove of the base (1) to achieve the tightening of the polishing wheel (7); the radial displacement of the polishing wheel (7) can be controlled by rotating the rocker (801) to change the pressing force between the polishing wheel (7) and the inner wall of the pipe (6); The polishing wheel (7) comprises a unit of ultra-slender tubular material for thinning and fine polishing stages; The thinning unit is a diamond grinding wheel with a base diameter of 1mm and a length of 400mm. The diamond abrasive is fixed to the base surface by high-temperature plasma torch brazing. The abrasive fixing area is 300mm long. The base is 304 hard straight steel wire. Micro holes and micro grooves are machined at both ends by electric sparks. The fine polishing unit is a wool felt wheel with a base diameter of 1mm and a length of 400mm. The wool felt is coated on the base by an adhesive. The coating area is 300mm long. The base is 304 hard straight steel wire. Micro holes and micro grooves are machined at both ends by electric sparks. The diamond grinding wheel is first used to remove the original defects such as peaks, pits and cracks on the inner wall of the pipe, and then the wool felt wheel is used to remove the scratches caused by the diamond grinding wheel processing to achieve high surface quality processing of the inner wall of the pipe.

2. The device for precise polishing of the inner wall of an ultra-slender tube according to claim 1, characterized in that: First, the rocker (801) is rotated to adjust the rotating shaft of the stepper motor (811) to be concentric with the rotating shaft of the hollow stepper motor (401). A thin steel wire rope is respectively wrapped around the micro holes at both ends of the diamond grinding wheel and led out along the micro groove to prevent the thin steel wire rope from damaging the inner wall of the pipe during the subsequent processing. The thin steel wire rope led out at the left end is fixed on the wire hook (812-1) and set aside after being fixed. The spacing between the precision chucks (403-1, 403-2) is adjusted according to the needs of the processed pipe. The pipe ( 6) From the right side of the center hole of the hollow stepper motor (401-2), the lower part of the arc baffle (501) is passed horizontally to make it contact with the precision chuck (403-1), and after adjusting the position of the pipe (6), the precision chuck (403) is adjusted to clamp the pipe, and the motor support plate (402) is moved to tighten the pipe (6), and the knob (507) is turned to make the inner wall of the arc baffle (501) and the outer wall of the pipe (6) frictionally contact, and the locking knob (504) is turned to lock the z-axis translation stage to suppress the bending of the pipe caused by subsequent processing. The diamond grinding wheel is then pulled to pass through the pipe (6) from the left side of the center hole of the hollow stepper motor (401-1) and fixed on the wire hook (812-2). The fixing method is the same as the above-mentioned left end fixing method. After the diamond grinding wheel is fixed, the translation stage bracket (808) is moved to tighten the diamond grinding wheel. The rocker (801) is rotated to adjust the contact strength between the diamond grinding wheel and the inner wall of the pipe (6). Polishing liquid is injected into the inside of the pipe (6). The polishing liquid fully corrodes the defects on the inner wall of the pipe. After the thinning stage is completed, the control system is started, and the control system controls the hollow stepper motor (401) and the stepper motor (811) to drive the pipe (6) and the diamond grinding wheel to rotate, and at the same time controls the pipe axial movement unit (2) to drive the pipe (6) to reciprocate axially, so as to remove the defective layer on the inner wall of the pipe (6). After the thinning stage is completed, the wool felt wheel is used to replace the diamond grinding wheel to perform fine polishing on the inner wall of the pipe to remove the scratches caused by the diamond grinding wheel. The processing process is consistent with the processing process in the thinning stage.

3. The device for precise polishing of the inner wall of an ultra-slender tube according to claim 1, characterized in that: The arc baffle (501) is made of rubber material, which can effectively alleviate the vibration of the pipe during the processing. The inner wall of the arc baffle (501) is coated with rubber grease to reduce the wear on the outer wall of the pipe.

4. The device for precise polishing of the inner wall of an ultra-slender tube according to claim 1, characterized in that: The polishing liquid can chemically corrode the inner wall of the capillary to form a passivation film that is conducive to cutting. Different types of polishing liquids can be selected according to different materials.

5. A method for precision polishing the inner wall of an ultra-slender tube, characterized in that: The process of processing the inner wall of an ultra-slender tube using the device for precise polishing of the inner wall of the ultra-slender tube according to claim 1 comprises the following steps: Step 1: Turn the rocker (801) to adjust the rotating shaft of the stepper motor (811) to be concentric with the rotating shaft of the hollow stepper motor (401), use a thin steel wire rope to wrap around the micro holes at both ends of the diamond grinding wheel and lead it out along the micro groove to prevent the thin steel wire rope from damaging the inner wall of the pipe during the subsequent processing, and fix the thin steel wire rope led out from the left end on the wire hook (812-1), and set it aside after fixing; Step 2: adjust the spacing between the precision chucks (403-1, 403-2) according to the needs of the processed pipe, pass the pipe (6) horizontally through the lower part of the arc baffle (501) from the right side of the center hole of the hollow stepper motor (401-2) to make it contact the precision chuck (403-1), adjust the position of the pipe (6) and then adjust the precision chuck (403) to clamp the pipe, and move the motor support plate (402) to tighten the pipe (6); Step 3: Turn the knob (507) to make the inner wall of the arc baffle (501) frictionally contact with the outer wall of the tube (6), and turn the locking knob (504) to lock the z-axis translation stage to suppress the bending and vibration of the tube caused by subsequent processing; Step 4: Pull the thin steel wire rope at the right end of the diamond grinding wheel through the left side of the center hole of the hollow stepping motor (401-1) through the pipe (6) and fix it on the wire hook (812-2). The fixing method is the same as the above-mentioned left end fixing method. After the diamond grinding wheel is fixed, move the translation stage bracket (808) to tighten the diamond grinding wheel, and turn the rocker (801) to adjust the contact strength between the diamond grinding wheel and the inner wall of the pipe (6); Step 5: injecting polishing liquid into the interior of the pipe (6) to fully corrode the defective layer on the inner wall of the pipe; Step 6: Start the control system, and the control system controls the hollow stepper motor (401) and the stepper motor (811) to drive the pipe (6) and the diamond grinding wheel to rotate, and at the same time controls the pipe axial movement unit (2) to drive the pipe (6) to reciprocate axial movement, so as to remove the defective layer on the inner wall of the pipe (6) and complete the thinning stage processing; Step 7. Use a wool felt wheel to replace the diamond grinding wheel to perform fine polishing on the inner wall of the pipe to remove scratches caused by the diamond grinding wheel. The processing process is the same as that in the thinning stage.

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