A deburring tool and method for catheter tips

Abstract

This invention provides a deburring tool and method for deburring the end of a conduit, comprising a tail shank, a housing, a first spring, a second spring, an outer cutting head, an inner cutting head, and a pin. One end of the tail shank is connected to the clamping end of an adjustable-speed electric drill, and the other end is located within the cavity of the housing and fixedly connected to one end of the housing. The outer cutting head is installed in the cavity of the other end of the housing, and the inner cutting head is located inside the outer cutting head. The first spring and the second spring are stacked on the body of the other end of the tail shank and limited between the middle end face of the tail shank and the end face of the outer cutting head. The housing, the outer cutting head, and the inner cutting head are radially fixed by the pin, which can slide along the elongated holes on the side walls of the housing and the outer cutting head. The ends of the outer and inner cutting heads away from the springs are respectively provided with inner and outer conical cutting teeth. Driven by an external adjustable-speed drill, it can simultaneously remove burrs from the outer and inner circumferences of the conduit end face, with high quality consistency, simple operation, and high efficiency.

Description

Technical Field

[0001] This invention belongs to the field of aircraft duct manufacturing technology, specifically relating to a deburring tool and deburring method for duct ends. Background Technology

[0002] Conduits are an important component in aircraft mechanical connections. During installation, conduits are connected together using nuts and nozzles to streamline the aircraft's piping and enable its functions. Conduit manufacturing is an essential step during aircraft overhauls. This process involves flaring the conduits to ensure good contact between the connected end faces and guarantee stable performance.

[0003] To ensure the quality of the flaring of the catheter tip, it is essential to ensure that burrs are thoroughly removed without damaging the rest of the catheter substrate. Therefore, proper and efficient burr removal is a crucial step in ensuring catheter quality. Currently, the method for removing burrs from the catheter tip involves first using a triangular scraper and trimmer to remove burrs from the inner diameter, followed by using a flat file to remove burrs from the outer diameter. This method involves multiple steps, requires frequent tool changes, and is time-consuming, inefficient, and demands high individual skill. Different operators produce inconsistent burr removal quality, resulting in unsatisfactory work outcomes. This is especially problematic during mass production and replacement processes, where it is time-consuming, labor-intensive, and leads to inconsistent quality. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of complex and cumbersome process, low efficiency and inconsistent quality of existing catheter tip deburring methods, and to provide a catheter tip deburring tool and deburring method.

[0005] To achieve the above objectives, the technical solution provided by this invention is:

[0006] A deburring tool for the end of a conduit, characterized in that it comprises a tail shank, a housing, a first spring, a second spring, an outer cutting head, an inner cutting head, and a pin;

[0007] The tail shank is coaxially fixedly installed at one end of the housing, and one end of the tail shank is used to connect to an external adjustable speed electric drill, while the other end of the tail shank is located in the cavity at one end of the housing.

[0008] The inner and outer cutting heads are sequentially fitted into the cavity at the other end of the outer shell from the inside out. The outer cutting head can slide along the axial direction of the cavity of the outer shell, and the inner cutting head can slide along the axial direction of the inner cavity of the outer cutting head.

[0009] The outer casing and the outer cutter head sidewall are respectively provided with a first elongated hole and a second elongated hole along the axial direction. The inner cutter head sidewall is provided with a pin mounting hole. The pin passes through the first elongated hole, the second elongated hole and the pin mounting hole in sequence, connecting the outer casing, the outer cutter head and the inner cutter head radially, so that the outer casing, the outer cutter head and the inner cutter head can rotate synchronously under the drive of an external adjustable speed electric drill, and the pin can slide along the first elongated hole and the second elongated hole.

[0010] The outer and inner cutting heads, at their ends furthest from the first and second springs, are respectively provided with a coaxially expanding tapered hole and a tapered body. The tapered body is located inside the tapered hole, and an outer cutting tooth and an inner cutting tooth are respectively machined on the inner circumferential surface of the tapered hole and the outer circumferential surface of the tapered body. The outer cutting tooth and the inner cutting tooth are respectively used to contact the outer and inner burrs of the guide tube end.

[0011] The first spring and the second spring are stacked from the inside to the outside on the other end of the tail shank. In the initial state, the first spring and the second spring are in a stretched state, which is used to provide pre-pressure to the inner cutter head and the outer cutter head respectively during non-working periods, so that the inner cutter head and the outer cutter head are fixed in the corresponding positions of the housing. The first spring and the second spring are also used to simultaneously provide thrust to the inner cutter head and the outer cutter head respectively during working periods, so that the outer cutter teeth and the inner cutter teeth can simultaneously remove the outer circle burrs and the inner circle burrs of the guide tube end, and the outer circle and the inner circle have the same size after the burrs are removed.

[0012] Furthermore, the outer and inner burrs on the end of the catheter are perpendicular to the outer and inner surfaces of the catheter, respectively.

[0013] The taper of the conical hole on the outer cutter head and the taper of the conical body on the inner cutter head are both 60°.

[0014] Furthermore, the angle between the inner cutting tooth and the generatrix of the conical hole is 30°; the angle between the outer cutting tooth and the generatrix of the conical body is 30°.

[0015] Furthermore, when the outer cutter head and the inner cutter head are flush at both ends, the large end of the cone is located inside the cone hole, and the distance from the large end of the cone to the small end of the cone hole is 0-5mm.

[0016] Furthermore, the outer shell is rotary, and its cavity is a central through hole opened along the axis. One end of the central through hole has an internal thread on its inner wall, and the other end of the central through hole is a stepped hole for installing the outer cutter head.

[0017] The first elongated hole is formed on the side wall of the housing near the mounting positions of the outer and inner cutting heads.

[0018] Furthermore, the tailstock includes a first cylinder, an end cap, a stud, and a second cylinder that are coaxially fixed together in sequence; the first cylinder is used to connect to the clamping end of the adjustable speed electric drill.

[0019] The stud and the second cylinder are located at one end of the central through hole of the outer shell, and the stud is connected to the internal thread of the inner wall of the outer shell, and the end cap is in contact with one end face of the outer shell;

[0020] The first spring and the second spring are stacked on the second cylinder. The two ends of the first spring are limited between the end face of the stud and the large end face of the inner cutter head, and the two ends of the second spring are limited between the end face of the stud and the large end face of the outer cutter head.

[0021] Furthermore, the inner cavity of the outer cutter head includes a second cylindrical hole and a first cylindrical hole that are coaxially connected to the tapered hole in sequence, wherein the inner diameter of the first cylindrical hole is larger than the inner diameter of the second inner hole;

[0022] The second elongated hole is formed on the side wall of the outer cutter head near the first post hole.

[0023] Furthermore, the inner cutter head includes a second column and a first column that are coaxially connected to the cone in sequence, wherein the outer diameter of the first column is larger than the outer diameter of the second column;

[0024] The first column body matches the first column hole of the outer cutter head;

[0025] A blind hole is formed on the inner cutter head along the axis starting from the end face of the first column. The depth of the blind hole is determined according to the set spring compression amount. The blind hole is used to make way for the second cylinder of the tail shank when the inner cutter head moves axially.

[0026] The pin mounting hole is formed on the side wall of the second column and includes a coaxially connected cylindrical hole and a screw hole.

[0027] Furthermore, the inner and outer cutting heads are made of DC53.

[0028] The deburring method using the above-mentioned deburring tool for the end of a conduit includes the following steps:

[0029] Step 1: Fix the guide tube to the bench vise and place the end to be deburred facing the deburring tool.

[0030] Step 2: Install the tailstock onto the clamping end of the adjustable speed drill and set the speed of the adjustable speed drill.

[0031] Step 3: Hold the adjustable speed electric drill and push the end of the deburring tool with the outer and inner cutting heads along the axial direction of the guide tube until the outer and inner circles of the guide tube end face abut against the outer and inner cutting heads respectively.

[0032] Step 4: Start the adjustable speed electric drill. The tail shank and housing rotate, which drives the inner and outer cutting heads to rotate synchronously, and at the same time removes the inner and outer burrs on the end of the guide tube.

[0033] Step 5: Visually inspect the catheter multiple times until the inner and outer burrs at the catheter tip are completely removed.

[0034] The advantages of this invention are:

[0035] 1. In this invention, an inner cutter head and an outer cutter head are designed. The inner cutter head is coaxially installed in the inner hole of the outer cutter head. During use, the end of the guide tube is placed at the cutting edge position of the inner and outer cutter heads, so that the outer end face of the guide tube contacts the cutting edge of the outer cutter head and the inner end face of the guide tube contacts the cutting edge of the inner cutter head. The deburring tool is used in conjunction with an external adjustable speed electric drill to achieve a one-time thorough removal of burrs on the inner and outer surfaces of the guide tube end. After burr removal, the cross-sections of the guide tube end are uniform and the quality is highly consistent.

[0036] 2. The deburring tool of this invention is suitable for conduits of the same model but different diameters. The process is simple and the work efficiency is increased many times compared with the traditional method. It is especially suitable for batch removal of burrs from the ends of conduits.

[0037] 3. When using the tool of this invention to remove burrs from the end of the catheter, the operation is simple and does not require consideration of the operator's personal skill level. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall shape of the aircraft duct end deburring tool of the present invention.

[0039] Figure 2 This is a cross-sectional view of a deburring tool for aircraft duct ends according to the present invention.

[0040] Figure 3 This is a schematic diagram of the tailstock structure in this invention;

[0041] Figure 4 This is a perspective view of the three-dimensional structure of the outer shell in this invention;

[0042] Figure 5 This is a schematic diagram of the first spring structure in this invention;

[0043] Figure 6 This is a perspective view of the three-dimensional structure of the outer cutting head in this invention;

[0044] Figure 7 This is a schematic diagram of the internal cutting head structure in this invention;

[0045] Figure 8 This is a schematic diagram of the pin structure in this invention;

[0046] Figure 9This is a schematic diagram of the deburring tool at the end of the conduit and its interaction with the aircraft conduit in an embodiment of the present invention.

[0047] Explanation of reference numerals in the attached drawings: 1-tail shank, 101-first cylinder, 102-end cap, 103-stud, 104-second cylinder; 2-outer shell, 3-first spring, 4-second spring, 5-outer cutter head, 6-inner cutter head, 601-first column, 602-second column, 603-cone, 7-pin, 8-aircraft guide tube. Detailed Implementation

[0048] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0049] Reference Figures 1-2 To ensure the consistency of the inner and outer diameters after removing burrs from the inner and outer diameters of the conduit end, this invention provides a deburring tool for the conduit end, comprising a tail shank 1, a housing 2, a first spring 3, a second spring 4, an outer cutter head 5, an inner cutter head 6, and a pin 7. The tail shank 1 is fixedly installed at one end of the housing 2, and one end of the tail shank is used to connect to an adjustable speed electric drill. The other end of the tail shank is located in the cavity at one end of the housing 2. The first spring 3 and the second spring 4 are stacked from the inside to the outside on the rod at the other end of the tail shank, respectively providing preload to the inner cutter head 6 and the outer cutter head 5 during non-working periods, fixing the inner and outer cutter heads in corresponding positions within the housing, and respectively providing thrust to the inner and outer cutter heads during working periods, so that the inner and outer cutter heads contact the inner and outer diameter burrs of the aircraft conduit end 8, respectively, and forming a consistent chamfer after burr removal. The inner cutter head 6 and the outer cutter head 5 are sequentially fitted into the cavity at the other end of the outer shell 2 from the inside out. The outer cutter head can slide along the axial direction of the outer shell cavity. The outer shell 2, the outer cutter head 5, and the inner cutter head 6 are radially connected by a pin 7, so that the outer shell 2, the outer cutter head 5, and the inner cutter head 6 can rotate synchronously under the drive of the tail shank. The outer shell 2 and the outer cutter head 5 have elongated holes on their side walls, so that while the pin 7 fixes the outer shell and the outer cutter head, it can drive the inner cutter head to slide along the axial direction of the inner cavity of the outer cutter head. The outer cutter head 5 and the inner cutter head 6, away from the first spring and the second spring, are respectively provided with a tapered hole that gradually expands outward in the same direction and a tapered body 603 that gradually narrows. The tapered body 603 is located in the tapered hole. The inner circumferential surface of the tapered hole and the outer circumferential surface of the tapered body are respectively machined with a ring of outer cutting teeth and inner cutting teeth, which are used to remove burrs on the outer and inner circumferential surfaces of the guide tube ends, respectively. During use, the inner and outer cutting heads contact the inner and outer burrs of the guide tube end under the thrust of the first and second springs, respectively, and simultaneously remove the burrs of the guide tube end under the torque of the adjustable-speed electric drill, forming a uniform chamfer after burr removal.

[0050] Reference Figure 3The tailstock 1 is designed and manufactured according to the clamping end size of the adjustable speed drill used, and is used to connect to the clamping end of the adjustable speed drill during use. The adjustable speed drill provides driving force for the deburring tool at the end of the guide tube. In actual use, the speed and torque of the adjustable speed drill can be adjusted according to the influence of the guide tube material and diameter on the deburring effect to improve the deburring effect. For ease of operation, a handheld adjustable speed drill is used in this invention.

[0051] The tailstock 1 has a multi-stage columnar structure, including a first cylinder 101, an end cap 102, a stud 103, and a second cylinder 104 connected coaxially in sequence. The first cylinder 101 is used to connect with the clamping end of an adjustable speed electric drill. The end face of the end cap 102 fits against the end face of the outer shell 2. The stud 103 and the second cylinder 104 are located inside the cavity of the outer shell 2, and the external thread of the stud 103 engages with the internal thread of the outer shell 2; the second cylinder 104 is used to mount the first spring 3.

[0052] Reference Figure 4 The outer casing 2 is a rotating body with a stepped central through hole along its axis, providing installation space for the tail shank 1, spring 3, outer cutter head 5, and inner cutter head. One end of the stepped central through hole in the outer casing 2 has an internal thread for engagement with the stud thread of the tail shank 1. The other end of the stepped central through hole is used to install the outer cutter head 5. The outer stepped surface of the outer cutter head 5 can fit against the inner stepped surface of the outer casing 2, and the outer cutter head can slide axially within the outer casing 2. A first strip-shaped hole is formed on the side wall of the outer casing 2 near the installation positions of the outer and inner cutter heads for the pin 7 to pass through. The outer casing 2, outer cutter head 5, and inner cutter head 6 are connected radially via the pin 7, transmitting the torque of the tail shank to the outer and inner cutter heads, causing them to rotate synchronously with the outer casing. The length of the first strip-shaped hole is determined according to the set spring compression, and the width of the first strip-shaped hole is slightly larger than the outer diameter of the pin 7 to ensure that the pin rod can pass smoothly through the first strip-shaped hole.

[0053] Reference Figure 5The outer cutter head 5 is installed at the other end of the central through hole in the outer shell 2, and is used to remove burrs from the outer circumference of the guide tube end. The outer cutter head 5 is a rotary structure, with multiple through holes along its central axis, including a first cylindrical hole, a second cylindrical hole, and a tapered hole that are coaxially connected in sequence. The inner diameter of the first cylindrical hole is larger than the inner diameter of the second cylindrical hole, and the inner diameter of the second cylindrical hole is 0.02-0.05 mm larger than the middle diameter of the guide tube. The first cylindrical hole is used to install the inner cutter head 6 and mate with the large end of the inner cutter head. Several first cutting teeth are evenly distributed circumferentially on the inner wall of the tapered hole, and the angle between the first cutting teeth and the generatrix of the tapered hole is 30°. Since the direction of burrs formed after the end face of the aircraft guide tube is flattened is basically perpendicular to the inner and outer surfaces of the guide tube, the cutting surface of the outer cutter head 5 should also be as perpendicular as possible to the burr direction in order to directly act on the burr. Based on the above analysis, in this embodiment, the taper of the conical hole is 60°. Combined with the pressure provided by the spring, after deburring, only a small chamfer is formed on the guide tube body, which has no impact on the subsequent flaring. This angle design is derived from experimental data. At this angle, the deburring efficiency is high and the damage to the tube body is minimal. A second strip-shaped hole is provided on the side wall of the outer cutter head 5 near the first column hole for the pin 7 to pass through. The length of the second strip-shaped hole is determined according to the set spring compression amount (the limit stroke of the inner cutter head). The width of the second strip-shaped hole is slightly larger than the outer diameter of the pin body, so that the pin rod section can pass smoothly through the second strip-shaped hole. The width of the first strip-shaped hole on the outer shell 2 is equal to the width of the second strip-shaped hole.

[0054] Reference Figure 6 The first spring 3 is fitted onto the second cylinder 104 of the tail shank 1, and both ends of the first spring 3 are limited between the stud end face of the tail shank 1 and the large end face of the inner cutter head 6; the diameter of the first spring 3 is larger than the diameter of the blind hole on the inner cutter head 6 and smaller than the large end diameter of the inner cutter head. The second spring 4 is coaxially stacked on the second cylinder 104 of the tail shank 1, and both ends of the second spring 4 are limited between the stud end face of the tail shank 1 and the large end face of the outer cutter head 5; the diameter of the second spring 4 is larger than the large end diameter of the inner cutter head 6 and smaller than the inner diameter of the outer shell 2.

[0055] The first spring 3 and the second spring 4 are initially in a stretched state, which can provide pre-pressure to the inner cutter head 6 and the outer cutter head 5 respectively during non-working periods, so that the inner cutter head 6 and the outer cutter head 5 are held in corresponding positions within the housing, that is, the outer step surface of the large end of the outer cutter head is in contact with the inner step surface of the housing 2, and the outer step surface of the large end of the inner cutter head is in contact with the inner step surface of the outer cutter head 5; and can provide the same elastic force to the inner cutter head 6 and the outer cutter head 5 respectively during working periods, so that the contact force between the inner cutter head and the outer cutter head and the inner and outer circles of the aircraft guide tube 8 end is the same, and a consistent chamfer can be formed after deburring.

[0056] Reference Figure 7The inner cutter head 6 is embedded in the multi-stage through hole of the outer cutter head 5 with clearance fit. The inner cutter head 6 is used to remove burrs from the inner circle of the guide tube end face. The inner cutter head 6 is multi-stage and includes a first column 601, a second column 602 and a tapered cone 603 connected coaxially in sequence. The diameter of the first column 601 is larger than the diameter of the second column. The taper of the cone 603 is 60 degrees. Several second cutting teeth are evenly distributed circumferentially on the outer wall of the cone. The angle between the second cutting teeth and the generatrix of the cone is 30°. The first column 601 mates with the first column hole of the outer cutter head 5, and the outer stepped surface of the inner cutter head 6 can fit against the inner stepped surface of the outer cutter head 5, thus playing a limiting role. The cone is located in the cone hole of the outer cutter head, and when the two ends of the inner cutter head 6 and the outer cutter head 5 are flush, the cone of the inner cutter head is located in the cone hole of the outer cutter head, and the distance between the large end of the cone of the inner cutter head and the small end of the cone hole of the outer cutter head is not greater than 0.5 mm. In this embodiment, it is designed to be 0.5 mm. This design is used for the centering and alignment of the deburring tool, that is, when the tool is working, the inner cutter head first contacts the inner end face of the guide tube, and after fitting, the inner cutter head slides 0.5 mm axially towards the spring end under the action of external thrust, and then the outer cutter head contacts the outer end face of the guide tube.

[0057] A blind hole is formed along the axis on the end face of the first column 601 on the inner cutter head 6, for engaging with the second cylinder 104 of the tail shank 1. The depth of the blind hole is determined according to the set spring compression amount, and the blind hole is used to allow space for the second cylinder of the tail shank when the inner cutter head 6 moves axially. The nominal diameters of the inner and outer cutter heads are the same and equal to the mean diameter of the aircraft guide tube, and the two cutter heads are fitted with a clearance of 0.02 mm to 0.05 mm, that is, the outer diameter of the inner cutter head 6 is 0.02 mm to 0.05 mm smaller than the mean diameter of the guide tube. A pin mounting hole is provided radially on the second column 602 of the inner cutter head 6. The pin mounting hole includes a coaxially connected post hole and a screw hole for fixing and installing the pin 7.

[0058] Due to manufacturing errors in the cutting tools and the presence of errors in the raw materials of the pipe, burrs on the inner and outer circles of the guide tube end face are not removed simultaneously during deburring. This results in inconsistent chamfer sizes on the inner and outer circles of the guide tube end face after deburring, or even one chamfer being too large, exceeding the process requirements. To avoid the above problems, the inner and outer cutting heads in this invention adopt a design that allows them to slide relative to each other. The inner and outer cutting heads contact the inner and outer edges of the guide tube end face under the pushing force of the first and second springs, respectively, to simultaneously perform the deburring work. After deburring, the inner and outer circles form a uniform chamfer.

[0059] Reference Figure 8The pin 7 includes a threaded section and a cylindrical end that are coaxially connected. The threaded section of the pin passes through the first elongated hole on the outer shell 2, the second elongated hole on the outer cutter head 5, and the pin mounting hole on the inner cutter head 6 in sequence. The threaded section of the pin is threadedly connected to the threaded hole of the pin mounting hole on the inner cutter head. The pin 7 can slide axially along the first elongated hole on the outer shell 2 and the second elongated hole on the outer cutter head 5, while transmitting the torque of the adjustable speed electric drill through the tailstock 1 and the outer shell 2 to the outer cutter head and the inner cutter head, so that the outer cutter head 5 and the inner cutter head 6 rotate together with the outer shell and the tailstock.

[0060] Based on the frequency of use of the deburring tool and the material of the guide tube, and considering the strength and toughness of the deburring cutter, DC53 is selected as the material for the inner and outer cutter heads in this embodiment.

[0061] Reference Figure 9 This diagram illustrates the interaction between the aircraft guide tube 8 and the cutting tool of this invention. The process of removing burrs using the cutting tool of this invention is as follows:

[0062] 1. Secure the aircraft guide tube 8 to the bench vise using a clamp.

[0063] 2. Install the tailstock 1 onto the adjustable speed drill and set the speed of the adjustable speed drill.

[0064] 3. Driven by an adjustable-speed electric drill, the tip of the cutting tool of this invention is pushed axially into the end of the aircraft guide tube 8 to be deburred. The inner cutting head first contacts the inner circle of the guide tube end face, and a pushing force is continuously applied. After the inner cutting head moves axially towards the adjustable-speed electric drill by about 0.5 mm, the outer cutting head contacts the outer circle of the aircraft guide tube end face. The 0.5 mm free sliding amount between the inner and outer cutting heads allows them to fit evenly on the inner and outer circles of the guide tube end face, ensuring the quality of the guide tube end face after deburring.

[0065] 4. Start the adjustable speed electric drill. The tail shank and housing 2 rotate, which in turn drives the inner and outer cutting heads to rotate synchronously, while removing the inner and outer round burrs on the end face of the guide tube.

[0066] 5. Perform multiple visual inspections until all inner and outer burrs are completely removed, at which point the work is complete.

[0067] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. A deburring tool for the end of a conduit, characterized in that, It includes a tailstock, outer shell, first spring, second spring, outer cutter head, inner cutter head, and pin; The tail shank is coaxially fixedly installed at one end of the housing, and one end of the tail shank is used to connect to an external adjustable speed electric drill, while the other end of the tail shank is located in the cavity at one end of the housing. The inner and outer cutting heads are sequentially fitted into the cavity at the other end of the outer shell from the inside out. The outer cutting head can slide along the axial direction of the cavity of the outer shell, and the inner cutting head can slide along the axial direction of the inner cavity of the outer cutting head. The outer casing and the outer cutter head sidewall are respectively provided with a first elongated hole and a second elongated hole along the axial direction. The inner cutter head sidewall is provided with a pin mounting hole. The pin passes through the first elongated hole, the second elongated hole and the pin mounting hole in sequence, connecting the outer casing, the outer cutter head and the inner cutter head radially, so that the outer casing, the outer cutter head and the inner cutter head can rotate synchronously under the drive of an external adjustable speed electric drill, and the pin can slide along the first elongated hole and the second elongated hole. The outer and inner cutting heads, at their ends furthest from the first and second springs, are respectively provided with a coaxially expanding tapered hole and a tapered body. The tapered body is located inside the tapered hole, and an outer cutting tooth and an inner cutting tooth are respectively machined on the inner circumferential surface of the tapered hole and the outer circumferential surface of the tapered body. The outer cutting tooth and the inner cutting tooth are respectively used to contact the outer and inner burrs of the guide tube end. The first spring and the second spring are stacked from the inside to the outside on the other end of the tail shank. In the initial state, the first spring and the second spring are in a stretched state, which is used to provide pre-pressure to the inner cutter head and the outer cutter head respectively during non-working periods, so that the inner cutter head and the outer cutter head are fixed in the corresponding positions of the housing. The first spring and the second spring are also used to simultaneously provide thrust to the inner cutter head and the outer cutter head respectively during working periods, so that the outer cutter teeth and the inner cutter teeth can simultaneously remove the outer circle burrs and the inner circle burrs of the guide tube end, and the outer circle and the inner circle have the same size after the burrs are removed.

2. The deburring tool for the end of a conduit according to claim 1, characterized in that, The outer and inner burrs on the end of the catheter are perpendicular to the outer and inner surfaces of the catheter, respectively. The taper of the conical hole on the outer cutter head and the taper of the conical body on the inner cutter head are both 60°.

3. The deburring tool for the end of a conduit according to claim 2, characterized in that, The angle between the inner cutting tooth and the generatrix of the conical hole is 30°; the angle between the outer cutting tooth and the generatrix of the cone is 30°.

4. The deburring tool for the end of a conduit according to claim 3, characterized in that, When the outer cutter head and the inner cutter head are flush at both ends, the large end of the cone is located inside the cone hole, and the distance from the large end of the cone to the small end of the cone hole is 0-5mm.

5. The deburring tool for the end of a conduit according to claim 1, characterized in that, The outer shell is rotary, and its cavity is a central through hole opened along the axis. One end of the central through hole has an internal thread on its inner wall, and the other end of the central through hole is a stepped hole for installing the outer cutter head. The first elongated hole is formed on the side wall of the housing near the mounting positions of the outer and inner cutting heads.

6. The deburring tool for the end of a conduit according to claim 5, characterized in that, The tailstock includes a first cylinder, an end cap, a stud, and a second cylinder that are coaxially and fixed together in sequence; the first cylinder is used to connect to the clamping end of an adjustable speed electric drill. The stud and the second cylinder are located at one end of the central through hole of the outer shell, and the stud is connected to the internal thread of the inner wall of the outer shell, and the end cap is in contact with one end face of the outer shell; The first spring and the second spring are stacked on the second cylinder. The two ends of the first spring are limited between the end face of the stud and the large end face of the inner cutter head, and the two ends of the second spring are limited between the end face of the stud and the large end face of the outer cutter head.

7. The deburring tool for the end of a conduit according to claim 6, characterized in that, The inner cavity of the outer cutter head includes a second cylindrical hole and a first cylindrical hole that are coaxially connected to the tapered hole in sequence, wherein the inner diameter of the first cylindrical hole is larger than the inner diameter of the second cylindrical hole; The second elongated hole is formed on the side wall of the outer cutter head near the first post hole.

8. The deburring tool for the end of a conduit according to claim 7, characterized in that, The inner cutter head includes a second column and a first column that are coaxially connected to the cone in sequence, wherein the outer diameter of the first column is larger than the outer diameter of the second column; The first column body matches the first column hole of the outer cutter head; A blind hole is formed on the inner cutter head along the axis starting from the end face of the first column. The depth of the blind hole is determined according to the set spring compression amount. The blind hole is used to make way for the second cylinder of the tail shank when the inner cutter head moves axially. The pin mounting hole is formed on the side wall of the second column and includes a coaxially connected cylindrical hole and a screw hole.

9. The deburring tool for the end of a conduit according to claim 1, characterized in that, The inner and outer cutting heads are made of DC53.

10. A deburring method using a deburring tool for catheter ends according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Fix the guide tube to the bench vise and place the end to be deburred facing the deburring tool. Step 2: Install the tailstock onto the clamping end of the adjustable speed drill and set the speed of the adjustable speed drill. Step 3: Under the drive of the adjustable speed electric drill, push the end of the deburring tool with the outer and inner cutting heads along the axial direction of the guide tube until the outer and inner circles of the guide tube end face abut against the outer and inner cutting heads respectively. Step 4: Start the adjustable speed electric drill. The tail shank and housing rotate, which drives the inner and outer cutting heads to rotate synchronously, and at the same time removes the inner and outer burrs on the end of the guide tube. Step 5: Visually inspect the catheter multiple times until the inner and outer burrs at the catheter tip are completely removed.

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