A machining tool and machining method for a small hole of a workpiece

Abstract

The application discloses a machining tool and machining method for a small hole of a workpiece, and belongs to the technical field of tools.The machining tool comprises a transmission assembly and a machining assembly.The transmission assembly comprises a telescopic shaft and a connecting sleeve, the telescopic shaft is slidably inserted into the connecting sleeve, one end of the telescopic shaft is provided with a roller, a sliding block is arranged on the outer wall of the telescopic shaft, the inner part of one end of the connecting sleeve is provided with a first elastic member, the other end of the connecting sleeve is provided with a protrusion, the connecting sleeve is provided with a strip-shaped hole, the strip-shaped hole extends along the axial direction of the connecting sleeve, and the sliding block is slidably inserted into the strip-shaped hole.The machining assembly comprises a blade and a second elastic member, the blade is hinged to the protrusion, the side of the blade away from the rotation axis is provided with a cutting edge, the other side of the blade is in sliding connection with the roller, and the blade and the protrusion are connected through the second elastic member.The machining tool for the small hole of the workpiece can realize chamfering of the inner side of the small hole of the workpiece.

Description

Technical Field

[0001] This invention belongs to the field of cutting tool technology, and more specifically, relates to a cutting tool and a machining method for machining small holes in workpieces. Background Technology

[0002] With the development of technology, people are increasingly pursuing miniaturized, integrated structural designs and packaging, resulting in various workpieces. Some of these workpieces have small holes that connect to the inner cavity of the workpiece. The intersections of these small holes and the inner wall of the workpiece require chamfering to prevent scratching related components, such as wires, on the inner wall of the hole.

[0003] Currently, due to the large size of the machine tool (which cannot be directly placed inside the workpiece), its cutting tool is fixedly installed through the transmission mechanism, making it impossible for the cutting tool to be directly inserted through the small hole, thus ultimately preventing chamfering. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a cutting tool and a machining method for machining small holes in workpieces. Its purpose is to ensure that the cutting tool can easily pass through and exit the small hole of the workpiece under the drive of the machine tool, and to achieve chamfering of the inner side of the small hole.

[0005] In a first aspect, the present invention provides a machining tool for machining small holes in a workpiece, the machining tool comprising a transmission assembly and a machining assembly;

[0006] The transmission assembly includes a telescopic shaft and a connecting sleeve. The telescopic shaft is slidably inserted into the connecting sleeve. One end of the telescopic shaft has a roller, and the outer wall of the telescopic shaft has a slider. One end of the connecting sleeve has a first elastic element inside to drive the other end of the telescopic shaft to slide. The other end of the connecting sleeve has a protrusion, and the connecting sleeve has a strip-shaped hole that extends axially along the connecting sleeve. The slider is slidably inserted into the strip-shaped hole.

[0007] The processing assembly includes a blade and a second elastic element. The blade is hinged to the protrusion. The rotation axis of the blade is perpendicular to the axis of the telescopic shaft. The side of the blade facing away from the rotation axis is the cutting edge. The other side of the blade is slidably engaged with the roller. The blade and the protrusion are connected through the second elastic element to drive the other side of the blade to abut against the roller.

[0008] Optionally, one side of the protrusion has a first limiting block to limit the rotation of the blade, and the blade is located between the first limiting block and the roller.

[0009] Optionally, a second limiting block is provided on the other side of the protrusion to limit the rotation of the blade, and the rotation axis of the blade is located between the first limiting block and the second limiting block.

[0010] Optionally, a plug is inserted into the inner hole of the connecting sleeve, and the first elastic element is clamped between the other end of the telescopic shaft and the plug.

[0011] Optionally, the outer peripheral wall of the plug has an external thread, and the inner hole of the connecting sleeve has an internal thread, with the external thread and the internal thread engaging.

[0012] Optionally, the cap has a groove on the side facing away from the roller, and the groove has a hexagonal structure.

[0013] Optionally, the telescopic shaft includes a first shaft and a second shaft coaxially connected, the outer diameter of the first shaft is smaller than the outer diameter of the second shaft, and the roller is located on the first shaft.

[0014] Optionally, the connecting sleeve includes a first sleeve and a second sleeve coaxially connected, the outer diameter of the first sleeve is smaller than the outer diameter of the second sleeve, the protrusion is located on the first sleeve, and the first elastic element is located inside the second sleeve.

[0015] Optionally, the protrusion and the connecting sleeve are integrally formed, and the outer diameter of the protrusion is not greater than the outer diameter of the connecting sleeve.

[0016] In a second aspect, the present invention provides a machining method for a machining tool for machining small holes in a workpiece, the machining method being based on the machining tool described in the first aspect, the machining method comprising:

[0017] S1. Fix the workpiece in place and fix the connecting sleeve on the output end of the machine tool;

[0018] S2. Based on the external force overcoming the elastic force of the first elastic element, the slider is pulled to move away from the blade, so that the blade rotates clockwise under the elastic force of the second elastic element, thereby causing the blade to rotate and retract to the standby position;

[0019] S3. Move the machining tool using the machine tool so that the blade passes through the small hole in the workpiece;

[0020] S4. Remove the external force. Under the elastic force of the first elastic element, the telescopic shaft moves toward the blade, and the roller presses the other side of the blade so that the blade rotates counterclockwise, thereby causing the cutting edge to rotate to the processing position.

[0021] S5. The machine tool drives the machining tool to rotate, thereby performing chamfering.

[0022] S6. Repeat step S2;

[0023] S7. Move the machining tool using the machine tool so that the cutting blade exits the small hole of the workpiece.

[0024] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0025] For a machining tool for a small hole in a workpiece provided in this embodiment of the invention, when chamfering the inner side of the small hole in the workpiece, firstly, the workpiece is fixedly installed, and the connecting sleeve is fixedly installed on the output end of the machine tool. Based on external force overcoming the elastic force of the first elastic element, the slider is pulled away from the blade, causing the blade to rotate clockwise under the elastic force of the second elastic element, thereby retracting the cutting edge to the standby position. At this time, during the rotation of the cutting edge, the protruding cutting edge moves towards the protrusion (reducing the outer diameter of the protrusion and the blade as a whole, allowing it to pass through the small hole), ensuring that subsequent cutting edges can smoothly pass through the small hole.

[0026] Next, the machine tool moves the cutting tool so that the insert passes through the small hole in the workpiece. The external force is removed, and under the elastic force of the first elastic element, the telescopic shaft moves towards the cutting tool. The roller presses against the other side of the cutting tool, causing it to rotate counterclockwise, thus rotating the cutting edge to the machining position. At this point, the cutting edge rotates outward (the protrusion and the outer diameter of the cutting tool increase), allowing the cutting edge to chamfer the inner side of the small hole in the workpiece. The machine tool drives the cutting tool to rotate, thereby performing the chamfering process.

[0027] Finally, based on the external force overcoming the elastic force of the first elastic element, the slider is pulled away from the blade, causing the blade to rotate clockwise under the elastic force of the second elastic element. This allows the cutting edge to rotate and retract to the standby position. Similarly, the protruding cutting edge can be moved towards the protrusion (reducing the outer diameter of the protrusion and the blade as a whole, allowing it to pass through the small hole), ensuring that subsequent cutting edges can smoothly exit the small hole. By moving the machining tool on the machine tool, the cutting edge exits the small hole of the workpiece.

[0028] In other words, the machining tool for small holes in workpieces provided in this embodiment of the invention can ensure that the cutting tool can easily pass through and exit the small hole of the workpiece under the drive of the machine tool, and achieve chamfering of the inner side of the small hole. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a cutting tool for machining small holes in a workpiece, provided in an embodiment of the present invention;

[0030] Figure 2This is a cross-sectional view of the transmission assembly provided in an embodiment of the present invention;

[0031] Figure 3 This is an enlarged view of the processing component provided in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram illustrating the use of a cutting tool for machining small holes in a workpiece, provided in an embodiment of the present invention.

[0033] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0034] Figure 6 This is a flowchart of a machining method for a tool used to machine small holes in a workpiece, provided by an embodiment of the present invention.

[0035] The symbols in the diagram represent the following meanings:

[0036] 1. Transmission assembly; 11. Telescopic shaft; 111. Roller; 112. Slider; 113. First shaft; 114. Second shaft; 12. Connecting sleeve; 121. First elastic element; 122. Protrusion; 1221. First limiting block; 1222. Second limiting block; 123. Strip hole; 124. Plug; 1241. Groove; 125. First sleeve; 126. Second sleeve; 2. Machining assembly; 21. Blade; 211. Cutting edge; 212. Rotating shaft; 22. Second elastic element; 100. Workpiece; 110. Small hole; 120. Chamfer. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] Figure 1 This is a schematic diagram of the structure of a machining tool for small holes in a workpiece provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the machining tool includes a transmission assembly 1 and a machining assembly 2.

[0043] Figure 2 This is a cross-sectional view of the transmission assembly provided in an embodiment of the present invention, such as... Figure 2 As shown, the transmission assembly 1 includes a telescopic shaft 11 and a connecting sleeve 12. The telescopic shaft 11 is slidably inserted into the connecting sleeve 12. One end of the telescopic shaft 11 has a roller 111, and the outer wall of the telescopic shaft 11 has a slider 112. One end of the connecting sleeve 12 has a first elastic element 121 inside to drive the other end of the telescopic shaft 11 to slide. The other end of the connecting sleeve 12 has a protrusion 122, and the connecting sleeve 12 has a strip hole 123 that extends along the axial direction of the connecting sleeve 12. The slider 112 is slidably inserted into the strip hole 123.

[0044] Figure 3 This is an enlarged view of the processing component provided in an embodiment of the present invention, such as... Figure 3 As shown, the processing assembly 2 includes a blade 21 and a second elastic element 22. The blade 21 is hinged to the protrusion 122. The rotation axis of the blade 21 is perpendicular to the axis of the telescopic shaft 11. The side of the blade 21 facing away from the rotation axis is the cutting edge 211. The other side of the blade 21 is slidably engaged with the roller 111. The blade 21 and the protrusion 122 are connected by the second elastic element 22 to drive the other side of the blade 21 to abut against the roller 111.

[0045] For a machining tool for a small hole in a workpiece provided in this embodiment of the invention, when chamfering 120 on the inner side of the small hole 110 of the workpiece 100, firstly, the workpiece 100 is fixedly installed, and the connecting sleeve 12 is fixedly installed on the output end of the machine tool. Based on external force overcoming the elastic force of the first elastic element 121, the slider 112 is pulled away from the blade 21, causing the blade 21 to rotate clockwise under the elastic force of the second elastic element 22, thereby causing the cutting edge 211 to rotate and retract to the standby position. At this time, during the rotation of the cutting edge 211, the blade 211 protruding from the protrusion 122 moves towards the protrusion 122 (reducing the outer diameter of the protrusion 122 and the blade 21 as a whole, so that it can pass through the small hole 110), ensuring that subsequent blades 21 can smoothly pass through the small hole 110 (see...). Figure 4 and Figure 5 ).

[0046] Next, the machining tool is moved by the machine tool, causing the insert 21 to pass through the small hole 110 of the workpiece 100. The external force is removed, and under the elastic force of the first elastic element 121, the telescopic shaft 11 moves towards the insert 21. The roller 111 presses against the other side of the insert 21, causing the insert 21 to rotate counterclockwise, thus rotating the cutting edge 211 to the machining position. At this time, the cutting edge 211 rotates outward (the outer diameter of the protrusion 122 and the insert 21 increases), and the cutting edge 211 can perform chamfering 120 on the inner side of the small hole 110 of the workpiece 100. The machining tool is driven to rotate by the machine tool, thereby performing the chamfering 120.

[0047] Finally, based on the external force overcoming the elastic force of the first elastic element 121, the slider 112 is pulled away from the blade 21, causing the blade 21 to rotate clockwise under the elastic force of the second elastic element 22. This causes the cutting edge 211 to rotate and retract to the standby position. Similarly, the cutting edge 211 protruding from the protrusion 122 can be moved towards the protrusion 122 (reducing the outer diameter of the protrusion 122 and the blade 21 as a whole, so that it can pass through the small hole 110), ensuring that the subsequent blade 21 can smoothly exit the small hole 110. By moving the machining tool on the machine tool, the blade 21 exits the small hole 110 of the workpiece 100.

[0048] In other words, the machining tool for small holes in workpieces provided in this embodiment of the invention can ensure that the cutting tool 21 can easily pass through and exit the small hole 110 of the workpiece 100 under the drive of the machine tool, and can perform chamfering 120 machining on the inner side of the small hole 110.

[0049] For example, the first elastic element 121 and the second elastic element 22 can be springs.

[0050] It is easy to understand that the slider 112 not only enables the telescopic shaft 11 to slide relative to the connecting sleeve 12, but also enables the telescopic shaft 11 and the connecting sleeve 12 to rotate synchronously, ensuring the consistency of the state of the blade 21 and the roller 111 during the machining process. In addition, the outer diameter of the chamfer 120 is larger than the diameter of the small hole 110. By rotating and retracting the cutting edge 211, it can be ensured that the blade 21 can not only pass smoothly through the small hole 110, but also exit from the small hole 110.

[0051] For example, the slider 112 is arranged to protrude from the strip hole 123, thereby facilitating the sliding of the slider 112.

[0052] See also Figure 3 The protrusion 122 has a first limiting block 1221 on one side to limit the rotation of the blade 21, and the blade 21 is located between the first limiting block 1221 and the roller 111.

[0053] In the above embodiment, the first limiting block 1221 can limit the blade 21 above the blade 21 to prevent the blade 21 from being driven to rotate counterclockwise by too large an angle when the external force is removed, causing the cutting edge 211 to rotate beyond the processing position (at this time, chamfering 120 processing cannot be performed).

[0054] For example, the first limiting block 1221 has a square structure.

[0055] Furthermore, on the other side of the protrusion 122, there is a second limiting block 1222 that limits the rotation of the blade 21, and the rotation axis of the blade 21 is located between the first limiting block 1221 and the second limiting block 1222.

[0056] In the above embodiment, the second limiting block 1222 can limit the blade 21 from below, preventing the blade 21 from rotating too much clockwise under the elastic force of the first elastic element 121 when the sliding slider 112 moves backward, causing the blade 211 to contact the roller 111 (at this time, the blade 21 and the roller 111 are stuck).

[0057] For example, the second limiting block 1222 has a square structure.

[0058] In this embodiment, the protrusion 122 has a rotating shaft 212 (equivalent to the rotation shaft of the blade 21), and the blade 21 is rotatably sleeved on the rotating shaft 212. In addition, the left end of the telescopic shaft 11 is also provided with a protrusion, and a rotating shaft is also arranged on the protrusion, and the roller 111 is rotatably arranged on the rotating shaft.

[0059] For example, the protrusion 122 and the connecting sleeve 12 are integrally formed, and the outer diameter of the protrusion 122 is not greater than the outer diameter of the connecting sleeve 12, thereby increasing the structural strength of the protrusion 122 and ensuring that the overall outer diameter of the machining tool is small, so that it can easily pass through the small hole 110.

[0060] See you again Figure 2 In one implementation of the present invention, a plug 124 is inserted into the inner hole of the connecting sleeve 12, and a first elastic member 121 is clamped between the other end of the telescopic shaft 11 and the plug 124.

[0061] In the above embodiments, the first elastic element 121 can be conveniently arranged by the plug cap 124.

[0062] Furthermore, the outer peripheral wall of the plug cap 124 has external threads, and the inner hole of the connecting sleeve 12 has internal threads. The external threads and internal threads mate to ensure a firm connection between the plug cap 124 and the connecting sleeve 12.

[0063] For example, the cap 124 has a groove 1241 on the side facing away from the roller 111. The groove 1241 has a hexagonal structure, so that it can be used with an external hex wrench to realize the convenient rotation of the cap 124.

[0064] In this embodiment, the telescopic shaft 11 includes a first shaft body 113 and a second shaft body 114 coaxially connected. The outer diameter of the first shaft body 113 is smaller than the outer diameter of the second shaft body 114, and the roller 111 is located on the first shaft body 113.

[0065] In the above embodiment, the outer diameter of the first shaft 113 is smaller, which makes it easier for it to pass through the small hole 110, while the outer diameter of the second shaft 114 is larger, which makes it easier to increase its structure and rotate in cooperation with the connecting sleeve 12.

[0066] Similarly, the connecting sleeve 12 includes a first sleeve 125 and a second sleeve 126 coaxially connected. The outer diameter of the first sleeve 125 is smaller than the outer diameter of the second sleeve 126. The protrusion 122 is located on the first sleeve 125, and the first elastic element 121 is located inside the second sleeve 126.

[0067] In the above embodiment, the outer diameter of the first sleeve 125 is smaller, which makes it easier for it to pass through the small hole 110, while the outer diameter of the second sleeve 126 is larger, which makes it easier to increase its structure and facilitates connection and transmission with the machine tool.

[0068] In one embodiment of the present invention, a pin (not shown) is movably inserted into the connecting sleeve 12. The pin can pass through the telescopic shaft 11, thereby limiting the telescopic shaft 11 in the axial direction. This ensures that when the blade 211 rotates and retracts to the standby position, the blade 211 is kept in the standby position, avoiding the continuous use of external force.

[0069] Figure 6 This is a flowchart of a machining method for a tool used to machine small holes in a workpiece, as provided in an embodiment of the present invention. Figure 6 As shown, this machining method is based on the aforementioned machining tool and includes:

[0070] S1. Fix the workpiece 100 in place and fix the connecting sleeve 12 on the output end of the machine tool.

[0071] S2. Based on the external force overcoming the elastic force of the first elastic element 121, the slider 112 is pulled to move away from the blade 21, so that the blade 21 rotates clockwise under the elastic force of the second elastic element 22, thereby causing the blade 211 to rotate and retract to the standby position.

[0072] S3. Move the machining tool by the machine tool so that the blade 21 passes through the small hole 110 of the workpiece 100.

[0073] S4. Remove the external force. Under the elastic force of the first elastic element 121, the telescopic shaft 11 moves toward the blade 21. The roller 111 presses the other side of the blade 21 so that the blade 21 rotates counterclockwise, thereby causing the cutting edge 211 to rotate to the processing position.

[0074] S5. The machining tool is driven to rotate by the machine tool to perform a chamfer of 120°.

[0075] S6. Repeat step S2.

[0076] S7. Move the machining tool by the machine tool so that the blade 21 exits the small hole 110 of the workpiece 100.

[0077] The present invention provides a machining method for a tool for machining small holes in a workpiece. With the drive of a machine tool, the tool 21 can easily pass through and exit the small hole 110 of the workpiece 100, and achieve the chamfering 120 machining on the inner side of the small hole 110.

[0078] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cutting tool for machining small holes in workpieces, characterized in that, The machining tool includes a transmission assembly (1) and a machining assembly (2); The transmission assembly (1) includes a telescopic shaft (11) and a connecting sleeve (12). The telescopic shaft (11) is slidably inserted into the connecting sleeve (12). One end of the telescopic shaft (11) has a roller (111), and the outer wall of the telescopic shaft (11) has a slider (112). One end of the connecting sleeve (12) has a first elastic element (121) to drive the other end of the telescopic shaft (11) to slide. The other end of the connecting sleeve (12) has a protrusion (122), and the connecting sleeve (12) has a strip hole (123) that extends along the axial direction of the connecting sleeve (12). The slider (112) is slidably inserted into the strip hole (123). The processing component (2) includes a blade (21) and a second elastic element (22). The blade (21) is hinged to the protrusion (122). The rotation axis of the blade (21) is perpendicular to the axis of the telescopic shaft (11). The side of the blade (21) facing away from the rotation axis is the cutting edge (211). The other side of the blade (21) is slidably engaged with the roller (111). The blade (21) and the protrusion (122) are connected through the second elastic element (22) to drive the other side of the blade (21) to abut against the roller (111). When the blade (21) passes through and exits the small hole (110) of the workpiece (100), the slider (112) is pulled away from the blade (21) by the external force overcoming the elastic force of the first elastic element (121), so that the blade (21) rotates clockwise under the elastic force of the second elastic element (22), thereby causing the blade (211) to rotate and retract to the standby position.

2. The cutting tool for machining small holes in a workpiece according to claim 1, characterized in that, The protrusion (122) has a first limiting block (1221) on one side to limit the rotation of the blade (21), and the blade (21) is located between the first limiting block (1221) and the roller (111).

3. A machining tool for small holes in a workpiece according to claim 2, characterized in that, On the other side of the protrusion (122), there is a second limiting block (1222) that limits the rotation of the blade (21), and the rotation axis of the blade (21) is located between the first limiting block (1221) and the second limiting block (1222).

4. A cutting tool for machining small holes in a workpiece according to claim 1, characterized in that, A plug (124) is inserted into the inner hole of the connecting sleeve (12), and the first elastic element (121) is clamped between the other end of the telescopic shaft (11) and the plug (124).

5. A machining tool for small holes in a workpiece according to claim 4, characterized in that, The outer peripheral wall of the plug (124) has an external thread, and the inner hole of the connecting sleeve (12) has an internal thread, and the external thread and the internal thread are engaged.

6. A cutting tool for machining small holes in a workpiece according to claim 5, characterized in that, The cap (124) has a groove (1241) on the side facing away from the roller (111), and the groove (1241) has a hexagonal structure.

7. A cutting tool for machining small holes in a workpiece according to any one of claims 1-6, characterized in that, The telescopic shaft (11) includes a first shaft body (113) and a second shaft body (114) coaxially connected. The outer diameter of the first shaft body (113) is smaller than the outer diameter of the second shaft body (114). The roller (111) is located on the first shaft body (113).

8. A cutting tool for machining small holes in a workpiece according to any one of claims 1-6, characterized in that, The connecting sleeve (12) includes a first sleeve (125) and a second sleeve (126) coaxially connected. The outer diameter of the first sleeve (125) is smaller than the outer diameter of the second sleeve (126). The protrusion (122) is located on the first sleeve (125), and the first elastic element (121) is located inside the second sleeve (126).

9. A cutting tool for machining small holes in a workpiece according to any one of claims 1-6, characterized in that, The protrusion (122) and the connecting sleeve (12) are integrally formed, and the outer diameter of the protrusion (122) is not greater than the outer diameter of the connecting sleeve (12).

10. A machining method for a cutting tool used to machine small holes in a workpiece, characterized in that, The machining method is based on the machining tool according to any one of claims 1-9, and the machining method includes: S1. Fix the workpiece (100) in place and fix the connecting sleeve (12) on the output end of the machine tool; S2. Based on the external force overcoming the elastic force of the first elastic element (121), the slider (112) is pulled to move away from the blade (21), so that the blade (21) rotates clockwise under the elastic force of the second elastic element (22), thereby causing the blade (211) to rotate and retract to the standby position. S3. Move the machining tool through the machine tool so that the blade (21) passes through the small hole (110) of the workpiece (100). S4. Remove the external force. Under the elastic force of the first elastic element (121), the telescopic shaft (11) moves toward the blade (21), and the roller (111) squeezes the other side of the blade (21) so that the blade (21) rotates counterclockwise, thereby causing the cutting edge (211) to rotate to the processing position. S5. The machine tool drives the machining tool to rotate, thereby performing chamfering (120). S6. Repeat step S2; S7. Move the machining tool by the machine tool so that the blade (21) exits the small hole (110) of the workpiece (100).

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