A milling tool and a method of milling

Abstract

The present application relates to numerical control machining assembly technical field, especially to a kind of milling cutters, including tool holder, the tool holder includes negative pressure adsorption hollow rod, still including detachably arranged in the tool holder inside tool holder assembly, the tool holder assembly includes the split frame inserted in the outside of negative pressure adsorption hollow rod, the bottom of the split frame is threadedly installed with hub connecting rod, the side of the hub connecting rod away from split frame is installed with tool holder outer frame, the bottom of the tool holder outer frame is fixedly installed with bottom disc, the bevelled slot is opened between the bottom disc and tool holder outer frame, the bevelled slot is set as inclined state along the parallel direction cross section.This application controls the air pressure of piston type guide component by negative pressure adsorption hollow rod, so that arc-shaped tool holder slides in bevelled slot.During processing, insert is retracted and sealed, when stopping, insert is unfolded to form chip clearance, which is convenient for air gun to clean up accumulated chips.

Description

Technical Field

[0001] This invention relates to the field of CNC machining component technology, and in particular to a milling cutter and a milling method thereof. Background Technology

[0002] Milling cutters, as the core tools in metal cutting, are typically mounted on CNC machine tools for machining. They are mainly used to efficiently shape materials into complex geometries and ensure machining accuracy. Their role spans high-end manufacturing fields such as aerospace, automotive manufacturing, and energy equipment. Existing milling cutters have solved the problems of tool deformation, vibration, and tool wear during machining by optimizing geometric angles, coating technology, and chip removal structures. They are used for precision machining of key components such as engine blades and casings. In the automotive manufacturing field, the tools focus on lightweight components such as aluminum alloy cylinder blocks / cylinder heads and transmission systems, using PCD inserts and modular designs to achieve a balance between high-speed milling and low surface roughness.

[0003] Existing micro-diameter end mills have low cutting edge strength and small chip removal space, which makes it easy for chips to clog the chip removal groove. As more chips accumulate inside the chip removal groove, the end mill's position is prone to shift, and tool vibration is also likely to occur, resulting in unstable machining accuracy. In particular, complex curved surfaces in five-axis machining require tools with high rigidity and low vibration characteristics. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background art by proposing a milling tool and a milling method thereof.

[0005] On one hand, this application proposes a milling cutter, including a tool holder, the tool holder including a negative pressure suction hollow rod, and further comprising: A detachable tool holder assembly is provided inside the tool holder. The tool holder assembly includes a split frame that is inserted into the outside of the negative pressure adsorption hollow rod. A central connecting rod is threaded onto the bottom of the split frame. A tool holder outer frame is installed on the side of the central connecting rod away from the split frame. A base is fixedly installed on the bottom of the tool holder outer frame. A beveled slot is provided between the base and the tool holder outer frame. The beveled slot is set in an inclined state along the cross-section of the parallel direction. A plug-in tool post assembly installed inside a tool post assembly, the plug-in tool post assembly including an arc-shaped tool post slidably installed inside a beveled slot, the arc-shaped tool post having an inclined tool holder on the side away from the tool post outer frame; The piston-type guide assembly installed inside the tool holder assembly, the arc-shaped tool holder adjusts the position of the piston-type guide assembly by changing the air pressure inside the tool holder assembly through negative pressure adsorption of the hollow rod, and thus is set in a slidable state along the inclined groove. The blade assembly is mounted on the outer surface of the insert-type tool holder assembly. Optionally, the blade holder further includes an auxiliary blade disc fixedly installed on the top of the negative pressure adsorption hollow rod. A polygonal positioning rod is fixedly installed at the bottom of the auxiliary blade disc. The negative pressure adsorption hollow rod is inserted into the polygonal positioning rod, and an extension positioning hole is provided at the bottom of the polygonal positioning rod.

[0006] Optionally, the top of the split frame is provided with a polygonal positioning hole groove. The shape of the opening of the polygonal positioning hole groove is adapted to the shape of the polygonal positioning rod. The polygonal positioning rod and the negative pressure adsorption hollow rod are both inserted into the interior of the split frame through the polygonal positioning hole groove on the side away from the auxiliary cutter head.

[0007] Optionally, both the split frame and the outer frame of the tool holder are provided with handle grooves on their outer sides.

[0008] Optionally, the piston-type guide assembly includes a piston rod, the top diameter of which is consistent with the inner diameter of the split frame, and a hollow rod frame is fixedly installed inside the split frame, with the piston rod slidably installed inside the hollow rod frame.

[0009] Optionally, a hollow cylinder is fixedly installed inside the outer frame of the tool holder, and an extension rod is fixedly installed at one end of the piston rod extending to the outer frame of the tool holder, the extension rod being slidably installed inside the hollow cylinder.

[0010] Optionally, the piston-type guide assembly includes a piston rod, and multiple bidirectional hinge rods are hinged to the outer side of the extension rod. The side of the bidirectional hinge rod away from the extension rod is hinged to one end of the arc-shaped tool holder extending into the inner frame of the tool holder. The bottom of the inner cavity of the hollow cylinder is arc-shaped.

[0011] Optionally, a sealing ring is provided between the hollow rod frame and the piston rod, a spring is fixedly installed between the piston rod and the hollow rod frame, a lower arc-shaped guide block is fixedly installed at one end of the arc-shaped tool holder extending into the inner frame of the tool holder, and multiple arc-shaped pressure blocks are fixedly installed on the outer side of the extension rod.

[0012] Optionally, the blade assembly includes an annular blade bolted to the outside of a tilted shank, the annular blade having a tilted cutting edge on its outer side.

[0013] On the other hand, this application provides a milling method using the milling tool described above, comprising the following steps: S1: First, insert the tool holder into the split frame by negative pressure suction of the hollow rod, and use the polygonal positioning rod to engage with the polygonal positioning hole slot to ensure a stable connection; S2: Initiate negative pressure adsorption, causing the piston rod to move upward, and push the arc-shaped knife holder to slide along the inclined groove to the sealing position through the bidirectional hinge rod; S3: The pressure sensor block detects whether the tool holder is in position, and the ring blade of the blade assembly can be rotated and replaced to even out wear; S4: After processing is completed, the negative pressure is released, the spring pushes the piston rod to move down, the tool holder unfolds to form a chip removal gap, and the chips are cleaned with an air gun; S5: Disassemble the split frame and tool holder frame through the handle groove for targeted repairs.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. The air pressure of the piston-type guide assembly is controlled by the negative pressure adsorption hollow rod, so that the arc-shaped tool holder slides in the inclined groove. During processing, the blade retracts and seals, and when stopped, the blade unfolds to form a chip removal gap, which is convenient for the air gun to clean the accumulated chips. 2. The tool holder is connected to the split frame by negative pressure adsorption of the hollow rod, and the polygonal positioning rod and the polygonal positioning hole groove are engaged to prevent the tool from rotating and deviating, thus ensuring the stability of the milling process. 3. When the arc-shaped tool holder comes into contact with the pressure sensing block, an electrical signal is generated and fed back to the control panel to confirm that the installation is in place. If there is no signal, an alarm is triggered to prevent the tool from being over-grinded or misoperated. 4. The tool holder is connected to the split frame by negative pressure adsorption of the hollow rod, and the polygonal positioning rod and the polygonal positioning hole groove are engaged to prevent the tool from rotating and deviating, thus ensuring the stability of the milling process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a milling cutter; Figure 2 This is a schematic diagram of the outer frame of the tool holder of the present invention; Figure 3 This is a schematic diagram of the piston rod of the present invention; Figure 4 This is a schematic diagram of the split frame structure of the present invention; Figure 5 This is a schematic diagram of the chassis structure of the present invention; Figure 6 This is a schematic diagram of the beveled slot structure of the present invention; Figure 7 This is a schematic diagram of the structure of the bidirectional hinge rod of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of region A in the middle; Figure 9 For the present invention Figure 7 Enlarged view of region B in the middle; Figure 10 For the present invention Figure 7 Enlarged view of the central C region; Figure 11 This is a schematic diagram of the blade assembly of the present invention.

[0016] Reference numerals: 1. Tool holder; 101. Auxiliary tool disc; 102. Polygonal positioning rod; 103. Extension positioning hole; 104. Negative pressure adsorption hollow rod; 2. Tool holder assembly; 201. Tool holder outer frame; 202. Split frame; 203. Handle groove; 204. Chassis; 205. Central connecting rod; 206. Polygonal positioning hole groove; 207. Beveled slot; 208. Pressure sensing block; 3. Plug-in tool holder assembly; 301. Arc-shaped tool holder; 302. Inclined tool handle; 303. Lower arc-shaped guide block; 4. Piston-type guide assembly; 401. Piston rod; 402. Hollow rod frame; 403. Hollow cylinder; 404. Extension rod; 405. Two-way hinged rod; 406. Spring; 407. Sealing ring; 408. Arc-shaped pressure block; 5. Blade assembly; 501. Annular blade; 502. Inclined blade edge. Detailed Implementation

[0017] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0019] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] like Figures 1 to 6 As shown, the present invention proposes a milling tool, including a tool holder 1, the tool holder 1 including a negative pressure adsorption hollow rod 104, the tool holder 1 also including an auxiliary tool disc 101 fixedly installed on the top of the negative pressure adsorption hollow rod 104, a polygonal positioning rod 102 fixedly installed on the bottom of the auxiliary tool disc 101, and the negative pressure adsorption hollow rod 104 inserted into the polygonal positioning rod 102.

[0023] The milling cutter also includes a tool holder assembly 2 detachably disposed inside the tool holder 1. The tool holder assembly 2 includes a split frame 202 inserted into the outside of the negative pressure adsorption hollow rod 104. A central connecting rod 205 is threaded onto the bottom of the split frame 202. A tool holder outer frame 201 is installed on the side of the central connecting rod 205 away from the split frame 202. A base 204 is fixedly installed at the bottom of the tool holder outer frame 201. A beveled slot 207 is provided between the base 204 and the tool holder outer frame 201. The beveled slot 207 is inclined along the parallel direction. A polygonal positioning hole slot 206 is provided on the top of the split frame 202. The shape of the polygonal positioning hole slot 206 is adapted to the shape of the polygonal positioning rod 102. The polygonal positioning rod 102 and the side of the negative pressure adsorption hollow rod 104 away from the auxiliary tool disc 101 are both inserted into the split frame 202 through the polygonal positioning hole slot 206. The multi-faceted positioning rod 102 has an extended positioning hole 103 at its bottom. Both the split frame 202 and the outer side of the tool holder frame 201 have handle grooves 203. A plug-in tool holder assembly 3 is installed inside the tool holder assembly 2. The plug-in tool holder assembly 3 includes an arc-shaped tool holder 301 slidably installed inside the inclined side slot 207. An inclined tool handle 302 is provided on the side of the arc-shaped tool holder 301 away from the tool holder frame 201. A piston-type guide assembly 4 is installed inside the tool holder assembly 2. An insert assembly 5 is installed on the outer surface of the plug-in tool holder assembly 3. In the prior art, CNC equipment uses negative pressure adsorption to adsorb the tool. Therefore, during the process of the negative pressure adsorption hollow rod 104 being inserted into the split frame 202 and generating negative pressure adsorption using the negative pressure adsorption hole connected to the negative pressure adsorption hollow rod 104 itself, the multi-faceted positioning rod 102 is inserted into the multi-faceted positioning hole slot 206 for adaptation. Figure 7In the middle, the extended positioning hole 103 abuts against the polygonal positioning hole groove 206 located at the edge of the split frame 202, which improves the sealing between the split frame 202 and the polygonal positioning rod 102. The negative pressure adsorption hollow rod 104 extends into the interior of the split frame 202 for negative pressure adsorption. At the same time, during the process of machining the workpiece with the milling cutter, since the outer contour of the cross-section of the polygonal positioning rod 102 is a polygonal structure and the inner contour of the cross-section of the polygonal positioning hole groove 206 is a polygonal structure, after the two are inserted, the polygonal positioning rod 102 and the polygonal positioning hole groove 206 are locked together, which creates a limit. This prevents the tool holder outer frame 201, which is relatively connected to the split frame 202, from rotating on its own. Therefore, the tool holder assembly 2 as a whole will not rotate relative to the tool holder 1, thereby improving the stability of the milling cutter in the material machining.

[0024] If a part of the milling cutter is damaged, such as a problem with the seal between the split frame 202 and the central connecting rod 205, the operator can press on the handle groove 203 on the surface of the split frame 202 and rotate the split frame 202, making the split frame 202 and the central connecting rod 205 detachable. Similarly, if the seal between the central connecting rod 205 and the tool holder outer frame 201 is compromised, the tool holder outer frame 201 and the central connecting rod 205 can be detached. Thus, if the milling cutter is damaged, it is not necessary to replace the entire milling cutter; only the damaged component needs to be replaced, thereby increasing the service life of the milling cutter and reducing manufacturing and processing costs. It should be noted that the polygonal positioning hole groove 206 and the extended positioning hole 103 are polygonal structures, and polygonal structures include shapes such as triangles, quadrilaterals, hexagons, and octagons. At the same time, each side of the polygonal positioning hole groove 206 is an arc structure, which reduces excessive friction and damage to the polygonal positioning rod 102 when installed inside the polygonal positioning hole groove 206.

[0025] As one implementation method, such as Figures 2 to 9As shown, the arc-shaped tool holder 301 adjusts the position of the piston-type guide assembly 4 by changing the internal air pressure of the tool holder assembly 2 through negative pressure adsorption of the hollow rod 104, thus allowing it to slide along the inclined groove 207. The piston-type guide assembly 4 includes a piston rod 401, the top diameter of which is the same as the inner diameter of the split frame 202. A hollow rod frame 402 is fixedly installed inside the split frame 202, and the piston rod 401 is slidably installed inside the hollow rod frame 402. A 408 is fixedly installed inside the tool holder outer frame 201, and an extension rod 404 is fixedly installed at one end of the piston rod 401 extending to the tool holder outer frame 201. The extension rod 404 is slidably installed inside the 408. The extension rod 404 has multiple bidirectional hinged rods 405 hinged to its outer side. The side of the bidirectional hinged rods 405 away from the extension rod 404 is hinged to one end of the arc-shaped tool holder 301 extending into the tool holder outer frame 201. The bottom of the inner cavity of the hollow cylinder 403 is arc-shaped. A sealing ring 407 is provided between the hollow rod holder 402 and the piston rod 401. A spring 406 is fixedly installed between the piston rod 401 and the hollow rod holder 402. A lower arc-shaped guide block 303 is fixedly installed at one end of the arc-shaped tool holder 301 extending into the tool holder outer frame 201. Multiple arc-shaped pressure blocks 408 are fixedly installed on the outer side of the extension rod 404. In the prior art, chips are prone to clogging when machining aluminum alloys. In the machining of 3C mid-frames, after continuously machining 500 pieces with a micro-diameter milling cutter, the accuracy deviation typically exceeds 0.005mm. When the negative pressure adsorption hollow rod 104 generates negative pressure adsorption on the interior of the split frame 202 and the tool holder outer frame 201, the space between the top of the piston rod 401 and the negative pressure adsorption hollow rod 104 forms a relatively sealed space because the top of the piston rod 401 is in contact with the inner cavity of the split frame 202. Since the piston rod 401 can slide along the hollow rod frame 402, the piston rod 401 will move upward a small distance. At this time, the piston rod 401 overcomes the elastic force of the spring 406 and is wrapped by the sealing ring 407, causing the piston to... The piston rod 401 and the negative pressure adsorption hollow rod 104 have good sealing performance. The piston rod 401 drives the extension rod 404 to move upward, and the extension rod 404 will bring the bidirectional hinge rod 405 to move upward. The edge of the bidirectional hinge rod 405 is guided by the arc-shaped edge of the bottom of the hollow cylinder 403. When the two come into contact, the contact end of the bidirectional hinge rod 405 is squeezed by the hollow cylinder 403 and deflects towards the outer surface of the piston rod 401. The other end of the bidirectional hinge rod 405 drives the arc-shaped tool holder 301 to retract along the inclined groove 207 until the outer surface of the arc-shaped tool holder 301 completely overlaps with the inclined groove 207 to form a seal, thereby ensuring the stability of the milling process.

[0026] It is worth noting that when the negative pressure adsorption hollow rod 104 separates from the split frame 202, the negative pressure adsorption hollow rod 104 no longer maintains a negative pressure state. The elasticity of the spring 406 and gravity drive the piston rod 401 to move downward a short distance. At this time, the bidirectional hinge rod 405 is released from the enclosure of the hollow cylinder 403, and the arc-shaped pressure block 408 uses its arc-shaped surface to squeeze the arc-shaped guide block 303 downward, preventing the arc-shaped tool holder 301 from being too tightly stuck in the inclined groove 207. This allows the arc-shaped tool holder 301 to disengage from the beveled slot 207. The beveled slot 207 is an inclined slot that widens from the piston rod 401 outwards. As a result, the arc-shaped tool holder 301 separates from the beveled slot 207, and a clear gap is formed between the arc-shaped tool holder 301 and the beveled slot 207 on both sides. The operator can use an air gun to clean the chips accumulated inside the tool holder frame 201, thereby ensuring the stability of the tool and reducing the impact on machining. At the same time, when the arc-shaped tool holder 301 is installed in the specified position inside the inclined slot 207, the arc-shaped tool holder 301 and the pressure sensing block 208 are squeezed together, and a pressure signal is generated between them. The pressure signal is transmitted to the control panel through an electrical signal. At this time, it means that the arc-shaped tool holder 301 is installed in the specified position. If there is no pressure signal, it reminds the operator to clean the milling tool.

[0027] As one implementation method, such as Figure 10 As shown, in this embodiment, the blade assembly 5 includes an annular blade 501 that is bolted to the outside of the inclined tool holder 302. An inclined cutting edge 502 is provided on the outside of the annular blade 501. Traditional tool monitoring relies on manual experience, such as judging tool wear by cutting sound. At the same time, it is easy to cause over-wearing of the blade due to failure to replace the blade in time.

[0028] Furthermore, the surface of the blade assembly 5 is circular, and the outer side of its cross-section contains blades of the same size. By rotating the blades, workers can change their positions, allowing damaged blades to be replaced on other surfaces. This facilitates the installation and continued use of the blades without delaying the processing progress. Meanwhile, a pressure sensor is installed between the tilting tool holder 302 and the arc-shaped tool holder 301. When measuring the tool base, it is necessary to ensure that each tool is on the same horizontal line. If multiple tools are pressing against the reference table of the CNC lathe, some tools may not be transmitted to the pressure sensor through the arc-shaped tool holder 301, so the operator can change the tool more quickly.

[0029] This application includes a milling method comprising the following steps: S1: First, insert the tool holder 1 into the split frame 202 by negative pressure adsorption of the hollow rod 104, and use the polygonal positioning rod 102 to engage with the polygonal positioning slot 206 to ensure a stable connection. S2: Initiate negative pressure adsorption, causing the piston rod 401 to move upward, and push the arc-shaped knife holder 301 to slide along the inclined groove 207 to the sealing position through the bidirectional hinge rod 405; S3: Pressure sensor block 208 detects whether the tool holder is in position; the ring blade 501 of the blade assembly 5 can be rotated and replaced to balance wear. S4: After processing is completed, the negative pressure is released, the spring 406 pushes the piston rod 401 to move down, the tool holder unfolds to form a chip removal gap, and the chips are cleaned with an air gun. S5: Disassemble the split frame 202 and the tool holder outer frame 201 through the handle groove 203 for targeted maintenance.

[0030] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A milling cutter, comprising a tool holder (1), said tool holder (1) including a negative pressure adsorption hollow rod (104), characterized in that, Also includes: A detachable tool holder assembly (2) is installed inside the tool holder (1). The tool holder assembly (2) includes a split frame (202) inserted into the outside of the negative pressure adsorption hollow rod (104). A central connecting rod (205) is threaded on the bottom of the split frame (202). A tool holder outer frame (201) is installed on the side of the central connecting rod (205) away from the split frame (202). A base plate (204) is fixedly installed on the bottom of the tool holder outer frame (201). A beveled slot (207) is provided between the base plate (204) and the tool holder outer frame (201). The beveled slot (207) is set in an inclined state along the cross section in the parallel direction. A plug-in tool post assembly (3) is installed inside the tool post assembly (2). The plug-in tool post assembly (3) includes an arc-shaped tool post (301) that is slidably installed inside the inclined side slot (207). An inclined tool handle (302) is provided on the side of the arc-shaped tool post (301) away from the tool post outer frame (201). The piston-type guide assembly (4) installed inside the tool holder assembly (2) is a curved tool holder (301) that changes the air pressure inside the tool holder assembly (2) by negative pressure adsorption of hollow rod (104) to adjust the position of the piston-type guide assembly (4) and thus is set in a sliding state along the inclined side slot (207). The blade assembly (5) is mounted on the outer surface of the insert-type tool holder assembly (3).

2. A milling tool according to claim 1, characterized in that, The blade holder (1) also includes an auxiliary blade disc (101) fixedly installed on the top of the negative pressure adsorption hollow rod (104). A polygonal positioning rod (102) is fixedly installed at the bottom of the auxiliary blade disc (101). The negative pressure adsorption hollow rod (104) is inserted into the polygonal positioning rod (102). An extension positioning hole (103) is opened at the bottom of the polygonal positioning rod (102).

3. A milling tool according to claim 2, characterized in that, The top of the split frame (202) is provided with a polygonal positioning slot (206). The shape of the slot (206) is adapted to the shape of the polygonal positioning rod (102). The polygonal positioning rod (102) and the negative pressure adsorption hollow rod (104) on the side away from the auxiliary cutter disc (101) are both inserted into the interior of the split frame (202) through the polygonal positioning slot (206).

4. A milling tool according to claim 3, characterized in that, Both the split frame (202) and the outer side of the tool holder frame (201) are provided with handle grooves (203).

5. A milling tool according to claim 4, characterized in that, The piston-type guide assembly (4) includes a piston rod (401), the top diameter of which is consistent with the inner diameter of the split frame (202), and a hollow rod frame (402) is fixedly installed inside the split frame (202), and the piston rod (401) is slidably installed inside the hollow rod frame (402).

6. A milling tool according to claim 5, characterized in that, A hollow cylinder (403) is fixedly installed inside the outer frame (201) of the tool holder. An extension rod (404) is fixedly installed at one end of the piston rod (401) extending to the outer frame (201) of the tool holder. The extension rod (404) is slidably installed inside the hollow cylinder (403).

7. A milling tool according to claim 6, characterized in that, The extension rod (404) is hinged to the outside of multiple bidirectional hinge rods (405). The side of the bidirectional hinge rod (405) away from the extension rod (404) is hinged to one end of the arc-shaped tool holder (301) extending into the inner frame (201) of the tool holder. The bottom of the inner cavity of the hollow cylinder (403) is arc-shaped.

8. A milling tool according to claim 7, characterized in that, A sealing ring (407) is provided between the hollow rod frame (402) and the piston rod (401). A spring (406) is fixedly installed between the piston rod (401) and the hollow rod frame (402). A lower arc-shaped guide block (303) is fixedly installed at one end of the arc-shaped tool holder (301) extending into the inner part of the tool holder outer frame (201). Multiple arc-shaped pressure blocks (408) are fixedly installed on the outer side of the extension rod (404).

9. A milling tool according to claim 8, characterized in that, The blade assembly (5) includes an annular blade (501) bolted to the outside of an inclined shank (302), the annular blade (501) having an inclined cutting edge (502) on its outer side.

10. A milling method, applied to a milling tool as described in claim 9, characterized in that, Includes the following steps: S1. Insert the tool holder (1) into the split frame (202) by negative pressure adsorption of the hollow rod (104), and use the polygonal positioning rod (102) to engage with the polygonal positioning hole groove (206) to ensure a stable connection; S2. Start the negative pressure adsorption, causing the piston rod (401) to move upward, and push the arc-shaped knife holder (301) to slide along the inclined groove (207) to the sealing position through the bidirectional hinge rod (405); S3, the pressure sensing block (208) detects whether the tool holder is in position, and the ring blade (501) of the blade assembly (5) can be rotated and replaced to balance wear; S4. After processing, release the negative pressure, and the spring (406) pushes the piston rod (401) down, the tool holder unfolds to form a chip removal gap, and the chips are cleaned with an air gun; S5. Disassemble the split frame (202) and the tool holder outer frame (201) through the handle groove (203) for targeted maintenance.

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