Tool, clamping assembly and method for machining a ring groove

Abstract

The present application belongs to the technical field of machining, and particularly relates to a cutter, a clamping assembly and a machining method of a ring groove. The cutter comprises a middle body, a cutting body extending in a Y direction is arranged at an X direction end of the middle body, a space is formed through in a Z direction between the cutting body and the middle body, and a main cutting edge parallel to the X direction is arranged at a Y direction end of the cutting body.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a cutting tool, a clamping assembly, and a method for machining an annular groove. Background Technology

[0002] To address the requirements of cost reduction, efficiency improvement, and saving scavenging time, a [technology / system] was developed. The 140mm drill-free staged cement injector, through research on large-gap sealing technology and composite shear pin smooth shearing technology, reduces the risk of jamming and improves the success rate of slippage. To meet the large-gap sealing design requirements, the drill-free staged cement injector adopts a Y-shaped sealing ring, in which the core components, the closing sleeve and the opening sleeve, are designed with L-shaped sealing grooves (annular grooves) that match the Y-shaped sealing ring.

[0003] Currently, there are no turning tools available for machining the aforementioned L-shaped sealing grooves, and those skilled in the art cannot machine L-shaped sealing grooves that meet the usage requirements by turning. Therefore, there is an urgent need to develop a tool and machining method capable of machining L-shaped annular grooves. Summary of the Invention

[0004] In view of the technical problems mentioned above, the present invention aims to provide a cutting tool, a clamping assembly, and a method for machining annular grooves.

[0005] According to the present invention, a cutting tool is provided, comprising an intermediate body, a cutting body extending in the Y direction is provided at the X-direction end of the intermediate body, a gap is formed between the cutting body and the intermediate body in the Z direction, and a main cutting edge parallel to the X direction is provided at the Y-direction end of the cutting body.

[0006] In one specific embodiment, the Z-direction end face of the cutting body is constructed as a rake face, the main cutting edge is located at the Y-direction end of the rake face, and the tool rake angle is 2° to 10°.

[0007] In one specific embodiment, a chip breaker groove parallel to the X direction is provided at the X-reverse end of the rake face.

[0008] In one specific embodiment, the Y-direction end face of the cutting body is constructed as a rake face, the main cutting edge is located at the Z-direction end of the rake face, and the tool clearance angle is -2° to -10°.

[0009] In one specific embodiment, a second cutting body extending in the Y direction is provided at the X-opposite end of the intermediate body, and the second cutting body is rotationally symmetrical with the first cutting body.

[0010] According to the present invention, a clamping assembly is also provided, including a tool holder, a pressure plate, and a clamping screw. The tool holder is provided with a mounting groove for mounting a tool. The pressure plate is mounted on the tool holder by the clamping screw parallel to the Y direction, thereby clamping the tool mounted in the mounting groove. The tool holder is provided with a fixing groove. The pressure plate is provided with an insert plate that can be adapted to the fixing groove. After the insert plate is adapted to the fixing groove, it can restrict the movement of the pressure plate relative to the tool holder in the XY plane.

[0011] In one specific embodiment, the depth of the fixing groove is parallel to the Z direction, and the pressure plate is configured to be able to be inserted into the fixing groove along the axial direction of the clamping screw.

[0012] In one specific embodiment, a positioning element is provided below the pressure plate, and a positioning groove for fitting the positioning element is provided on the cutting tool.

[0013] In one specific embodiment, a second positioning surface is provided in the mounting groove of the tool holder, and a first positioning surface is provided on the tool for adapting to the second positioning surface.

[0014] In one specific embodiment, a cooling port is provided on the tool holder, and the cooling port is aligned with the main cutting edge of the tool.

[0015] According to the present invention, a method for machining an inner annular groove is also provided, comprising the following steps: Step 1: Use a grooving tool to machine a square groove inside the hole by turning. Step two: Using the cutting tool provided according to the present invention, an annular groove with an inner diameter larger than the square groove is machined at the end of the square groove by turning.

[0016] In one specific embodiment, in step one, a grooving tool is first used to rough machine a square groove in the hole, and then the square groove is precision machined. In step two, an annular groove is first formed at the end of the square groove using the cutting tool provided according to the present invention, and then the annular groove is finished. Attached Figure Description

[0017] The present invention will now be described with reference to the accompanying drawings.

[0018] Figure 1 A three-dimensional structural schematic diagram of an embodiment of a cutting tool according to the present invention is shown; Figure 2 Showing Figure 1 A top view of the cutting tool in the diagram; Figure 3 Showing Figure 1 A right-side view of the cutting tool in the diagram; Figure 4 A schematic diagram showing the machining of an annular groove using a tool according to the present invention is shown; Figures 5-7 A schematic diagram showing the use of the clamping assembly according to the invention is shown; Figure 8 A schematic diagram of a tool holder using the clamping assembly according to the invention is shown; Figure 9 and Figure 10 A schematic diagram of the machining of square grooves is shown; Figures 11-13 A schematic diagram of machining an annular groove is shown, with only the cutting body of the tool visible in the diagram.

[0019] The reference numerals in the figure are as follows: 1. Tool; 10. First locating surface; 11. Intermediate body; 12. Cutting body; 121. Second cutting body; 13. Empty space; 14. Main cutting edge; 15. Rake face; 16. Flank face; 17. Chip breaker groove; 18. Locating groove; 19. Tip of main cutting edge; 2. Tool holder; 21. Mounting slot; 22. Fixing slot; 23. Second positioning surface; 24. Cooling port; 25. Threaded hole; 3. Pressure plate; 31. Insert plate; 32. Positioning component; 4. Clamping screw; 50. Annular groove; 51. Square groove; 52. Annular groove; 53. Structural ring; 6. Grooving knife; 100. Clamping assembly.

[0020] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0021] It should be noted that "direction X" in this application refers to Figure 1 or Figure 5 The direction indicated by the X-axis in the diagram, "X-opposite direction" refers to the direction relative to... Figure 1 or Figure 5 The X-axis points in the opposite direction; the "Y direction" in this application refers to... Figure 1 or Figure 5 The direction indicated by the Y-axis in the diagram, "opposite direction of Y" refers to the direction relative to the x-axis. Figure 1 or Figure 5 The Y-axis points in the opposite direction; the "Z-direction" in this application refers to... Figure 1 or Figure 5 The direction indicated by the Z-axis in the diagram, "Z-opposite direction" refers to the direction relative to the Z-axis. Figure 1 or Figure 5The Z-axis points in the opposite direction. They are only used to define the relative positions of the components involved, not their absolute positions, and can be varied depending on the specific circumstances.

[0022] The directional terms or qualifiers used in this application, such as "up," "down," "front," "back," "left," and "right," refer to the accompanying drawings. They are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0023] In this embodiment, the cutting tool 1 is used to machine the L-shaped annular groove 50. The structure of the annular groove 50 is as follows: Figure 4 As shown, the annular groove 50 is an inner annular groove, including a square groove 51 and an annular groove 52 disposed at the axial end of the square groove 51. The square groove 51 is an annular groove with a square cross-section. The outer diameter of the annular groove 52 is the same as the outer diameter of the square groove 51, and the inner diameter of the annular groove 52 is larger than the inner diameter of the square groove 51. The radial inner side of the annular groove 52 is a structural ring 53.

[0024] Figure 1 The structure of the tool 1 according to the present invention is shown. For example... Figure 1 As shown, the tool 1 includes an intermediate body 11 and a cutting body 12.

[0025] In this embodiment, the cutting body 12 is fixedly disposed at the X-direction end of the intermediate body 11, and the cutting body 12 extends relative to the intermediate body 11 along the Y-direction. In this configuration, the intermediate body 11 is located in the opposite Y-direction of the cutting body 12, and the empty space 13 is located in the opposite X-direction of the cutting body 12. The empty space 13 is a space extending along the Z-direction without any components. A main cutting edge 14 parallel to the X-direction is provided at the Y-direction end of the cutting body 12.

[0026] The thickness of the cutting body 12 of the tool 1 in the X direction is less than the radial depth of the square groove 51. When the tool 1 is used to machine the annular groove 50, the main cutting edge 14 on the cutting body 12 of the tool 1 cuts the axial end face of the square groove 51 to form an annular groove 52. The empty space 13 of the tool 1 corresponds to the structural ring 53 of the annular groove 50.

[0027] In this embodiment, as Figures 1-3 As shown, the Z-direction end face of the cutting body 12 is constructed as a rake face 15, and the main cutting edge 14 is located at the Y-direction end of the rake face 15. The tool rake angle is 2° to 10°, that is, the angle α between the plane containing the X-axis and Y-axis and the rake face 15 is 2° to 10°, as shown. Figure 3 As shown. This tool rake angle setting reduces cutting force, produces regular chips, and results in a more uniform surface texture.

[0028] Preferably, the tool rake angle is designed to be 3°. In actual production, compared with other tool rake angles, designing the tool rake angle to be 3° can effectively increase the service life of tool 1.

[0029] In this embodiment, a chip breaker groove 17 parallel to the X direction is provided at the X-direction end of the rake face 15. The chip breaker groove 17 can effectively reduce the resistance generated by chip breaking, and has good chip breaking and chip removal effects. Furthermore, the chip breaker groove 17 adopts a straight-arc groove type, that is, the length direction of the chip breaker groove 17 is a straight line, and the cross-sectional shape of the chip breaker groove 17 is an arc shape.

[0030] In this embodiment, the Y-direction end face of the cutting body 12 is constructed as a flank face 16, and the main cutting edge 14 is located at the Z-direction end of the rake face 15. The tool clearance angle is -2° to -10°, that is, the angle β between the plane containing the X and Z axes and the flank face 16 is -2° to -10°. Figure 3 As shown. This setting of the tool rake angle can reduce the friction between the rake face 16 and the machined surface and transition surface of the workpiece.

[0031] Preferably, the tool clearance angle is designed to be -5°. In actual production, compared with other tool clearance angles, designing the tool rake angle to be -5° can effectively improve the stability of cutting load.

[0032] In one embodiment, a second cutting body 121 extending in the Y direction is provided at the X-direction opposite end of the intermediate body 11. The structure of the second cutting body 121 is the same as that of the first cutting body 12, and the second cutting body 121 and the first cutting body 12 form a 180° rotationally symmetrical structure, with the axis of rotational symmetry of the second cutting body 121 and the first cutting body 12 parallel to the Y-axis. When the first cutting body 12 wears out, the second cutting body 121 can be used to continue working.

[0033] In one embodiment of the invention, a clamping assembly 100 is also provided. For example... Figures 5-8 As shown, the clamping assembly 100 includes a tool holder 2, a pressure plate 3, and a clamping screw 4.

[0034] A mounting groove 21 for mounting the tool 1 is provided at the Y-direction end of the tool holder 2. The mounting groove 21 is constructed to be open in the X, Y, and Z directions of the tool holder 2. The shape of the mounting groove 21 is adapted to the shape of the tool 1, thereby allowing the tool 1 to be initially positioned on the tool holder 2. A threaded hole 25 is provided on the tool holder 2. The central axis of the threaded hole 25 is parallel to the Z-direction. The clamping screw 4 can be coaxially installed into the threaded hole 25 from top to bottom through the thread, that is, the central axis of the clamping screw 4 is parallel to the Z-direction. The clamping plate 3 is provided above the tool holder 2 by the clamping screw 4. The clamping screw 4 can apply a downward force to the clamping plate 3, causing the clamping plate 3 to press tightly against the tool holder 2. At least a portion of the clamping plate 3 extends above the mounting groove 21, so that the clamping plate 3 can apply a downward force to the tool 1 in the mounting groove 21, thereby fixing the tool 1 in the mounting groove 21 of the tool holder 2.

[0035] In one embodiment, a positioning groove 18 is provided on the Z-direction end face of the intermediate body 11 of the tool 1. A positioning element 32 with a shape adapted to the positioning groove 18 is provided at the lower end of the pressure plate 3. When the tool 1 is installed into the mounting groove 21, the length direction of the positioning groove 18 intersects the X-axis and Y-axis, and the positioning element 32 of the pressure plate 3 can be inserted into the positioning groove 18 from top to bottom, thereby strengthening the fixation of the tool 1. Figure 5 As shown, during the cutting process of the tool 1, the tool 1 is subjected to a force in the opposite direction of the Y direction from the workpiece. The length direction of the positioning groove 18 intersects the X-axis and Y-axis, so that the positioning groove 18 can cooperate with the positioning member 32 to counteract the force in the opposite direction of the Y direction from the workpiece.

[0036] In a specific embodiment, the cross-sectional shapes of the positioning groove 18 and the positioning member 32 are V-shaped or arc-shaped and mutually adapted to each other. During the process of the positioning member 32 being inserted into the positioning groove 18, it can play a role in correcting the deviation and positioning, and can enhance the contact pressure between the pressure plate 3 and the tool 1, with downward pressure and pulling force to prevent the tool body from moving outward.

[0037] Preferably, the cross-sectional shape of the positioning groove 18 and the positioning element 32 is a V-shaped conical surface that fits each other, the angle of the V-shaped conical surface is set to 60°, and the parallelism tolerance of the upper and lower surfaces is 0.012mm. This arrangement can enhance the contact pressure between the pressure plate 3 and the tool 1, providing downward pressure and pulling force to prevent the tool body from moving outward.

[0038] In an embodiment where a positioning groove 18 is provided on the Z-direction end face of the intermediate body 11, such as... Figure 5 As shown, the main cutting edge 14 of the tool 1 faces the Y direction. In another embodiment, a positioning groove 18 is provided on the Z-opposite end face of the intermediate body 11 of the tool 1. In this case, the main cutting edge 14 of the tool 1 can face the Y-opposite direction, and the clamping direction of the tool 1 is more flexible.

[0039] In one embodiment, a second positioning surface 23 is provided at the X-direction end of the mounting groove 21, and the second positioning surface 23 is inclined to the plane containing the Y-axis and Z-axis. In an embodiment where the cutting body 12 is provided in the X-direction of the intermediate body 11 of the tool 1, a first positioning surface 10 is provided in the X-direction of the tool 1 to adapt to the second positioning surface 23. When the tool 1 is placed in the mounting groove 21, the first positioning surface 10 of the tool 1 fits against the second positioning surface 23 of the mounting groove 21, thereby achieving the positioning of the tool 1 in the mounting groove 21. In an embodiment where the second cutting body 12 is provided in the X-direction of the intermediate body 11 of the tool 1, a first positioning surface 10 is provided in the X-direction of the tool 1 to adapt to the second positioning surface 23. It is easy to understand that the first positioning surface 10 avoids the position of the main cutting edge 14.

[0040] In one embodiment, a fixing groove 22 is provided on the tool holder 2, and an insert plate 31 that can be adapted to the fixing groove 22 is provided on the pressure plate 3. After the insert plate 31 is adapted to the fixing groove 22, it can restrict the rotation of the pressure plate 3 around the clamping screw 4. In this configuration, the insert plate 31 of the pressure plate 3 is inserted into the fixing groove 22, and after the pressure plate 3 is clamped by the clamping screw 4, the pressure plate 3 cannot move relative to the tool holder 2. In this configuration, the insert plate 31, the fixing groove 22, and the clamping screw 4 cooperate with each other to fix the pressure plate 3 on the tool holder 2. At the same time, the pressure plate 3 cooperates with the positioning groove 18 of the tool 1 through the positioning member 32 to position and fix the tool 1 on the tool holder 2.

[0041] In one specific embodiment, the depth of the fixing groove 22 is parallel to the Z direction, and the insert plate 31 of the pressure plate 3 is configured to be able to be inserted into the fixing groove 22 along the axial direction of the clamping screw 4.

[0042] In one embodiment, a cooling port 24 is provided on the tool holder 2, and the cooling port 24 is aligned with the main cutting edge 14 of the tool 1. The cooling port 24 can output cooling fluid, which serves to cool the main cutting edge 14 of the tool 1 and to clean it.

[0043] In one embodiment, a hose is provided at the cooling port 24, and the spray angle of the hose can be adjusted by manually bending the hose to aim at the cutting area of ​​the tool tip, so as to ensure the cooling effect of the cutting fluid.

[0044] In one embodiment of the present invention, a method for processing an annular groove 50 is also provided, comprising the following steps.

[0045] Step 1: Use a grooving tool to machine a square groove 51 inside the hole by turning. First, use a grooving tool to rough machine the square groove 51 inside the hole, and then finish machine the square groove 51.

[0046] Step 2: Using tool 1, machine an annular groove 52 with an inner diameter larger than the square groove at the end of the square groove by turning. First, use tool 1 to rough machine the annular groove 52 at the end of the square groove, and then finish machine the annular groove 52.

[0047] In the initial stage of processing and trial production, the inventors of this application manually sharpened the cutting tool according to the groove shape and parameters of the L-shaped inner annular groove 50, using a YG-type cemented carbide welded tool body. This approach severely limited the selection of tool structure and cutting parameters, consuming a significant amount of time for manual sharpening. The tool exhibited poor adaptability, rapid wear, and ineffective control over the machined surface quality, failing to meet machining accuracy requirements. Furthermore, the cutting efficiency was extremely low, with a product qualification rate of only 25%. To improve machining efficiency, this invention provides a tool 1 capable of machining the annular groove 50, the structure of which is detailed above.

[0048] In one embodiment provided by the present invention, tool 1 is used to process such as Figure 4 The L-shaped inner annular groove 50 is shown.

[0049] The annular groove 50 is an inner annular groove, including a square groove 51 and an annular groove 52 disposed at the axial end of the square groove 51. The square groove 51 is an annular groove with a square cross-section. The outer diameter of the annular groove 52 is the same as the outer diameter of the square groove 51, and the inner diameter of the annular groove 52 is larger than the inner diameter of the square groove 51. The radial inner side of the annular groove 52 is a structural ring 53.

[0050] In this embodiment, the square groove 51 has an axial width of 9.5 mm and a radial depth of 5.75 mm. The annular groove 52 has an axial width of 2.5 mm and a radial depth of 3 mm, and the radial inner wall of the annular groove 52 is a 10° cone.

[0051] In this embodiment, an ultrafine-grained cemented carbide YG8 PVD TiAlN coating is applied to the surface of the tool 1 to enhance the coating strength of the cutting edge. The surface accuracy Ra of the coated tooth surface is 0.3μm, making it suitable for high-speed, high-hardness alloy cutting. The ultrafine-grained cemented carbide YG8 PVD TiAlN coating is well known to those skilled in the art and will not be described in detail here.

[0052] The width of the tool body (the distance from the main cutting edge 14 to the Y-direction end face of the tool 1) is designed to be less than the axial width of the square groove 51, allowing the cutting body 12 to enter the square groove 51. In this embodiment, it is specifically designed to be 9.2 mm. The length of the main cutting edge 14 is designed to be less than the radial depth of the annular groove 52. In this embodiment, it is specifically designed to be 2.7 mm. The depth of the tool body (the distance from the main cutting edge 14 to the Y-direction end face of the empty space 13) is set to be greater than the axial width of the annular groove 52. In this embodiment, the depth is designed to be 3.5 mm, which can effectively avoid machining interference. The chip breaker groove 17 adopts a straight arc groove shape with an arc radius of 1 mm, which can effectively reduce the resistance generated by chip breaking and achieve good chip breaking and chip removal effects. The arc radius of the main cutting edge tip 19 is R0.2 mm, which is consistent with the groove shape of the annular groove 50 to be machined.

[0053] Tool holder 2 uses a VR40 universal interface, with a width and length of 40mm. When tool 1 is clamped onto tool holder 2, the distance between the tip 19 of the main cutting edge of tool 1 and the central axis of tool holder 2 is 29mm.

[0054] In Taking the machining of L-shaped annular groove 50 on the 140mm closing sleeve and opening sleeve as an example, the machining of annular groove 50 is divided into two processes. The first process uses a 4mm ordinary grooving tool to machine a square groove 51. The square groove is machined in two roughing steps. Finally, a finishing cut is made to achieve a machining accuracy of R1.6mm, and the bottom and top of the groove are rounded with R0.2 fillets. The tool path is as follows. Figure 9 and Figure 10 As shown. The second process involves turning the annular groove 52, which is done in two passes: the first pass machine the annular groove 52, exiting at a 10° angle to create a 10° conical surface; then a finish pass is made to remove all machining allowances and ensure a surface finish of R1.6mm, followed by a R0.5 chamfer. The toolpath is as follows. Figure 11 , Figure 12 and Figure 13 As shown.

[0055] During the machining process, the DMG MORI NTX3000GE20 machining center with good rigidity was selected. The roughing linear speed was 106m / min and the feed rate was 0.08mm / r. The finishing linear speed was 130m / min and the feed rate was 0.05mm / r. The optimal machining accuracy and the longest tool life were obtained in both cases.

[0056] Using the cutting tool 1 provided by the present invention to process the annular groove 50, the processing accuracy of the annular groove 50 is comprehensively improved, the product processing qualification rate is increased from the original 25% to 100%, the processing time per piece is shortened from the original 30 minutes to 5 minutes, and the processing efficiency is increased by 6 times.

[0057] It should be noted that although the annular groove 50 in this embodiment is an inner hole annular groove, this is not intended to limit the scope of protection of the present invention. The annular groove 50 can also be an outer wall annular groove provided on the outer wall of the cylinder. In this case, the inner diameter of the annular groove 52 is the same as the inner diameter of the square groove 51, the outer diameter of the annular groove 52 is smaller than the outer diameter of the square groove 51, and the radial outer side of the annular groove 52 is a structural ring 53. The method of machining the outer wall annular groove using the tool 1 is similar to the method of machining the inner hole annular groove, and will not be described again here.

[0058] In the description of this invention, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] 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 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cutting tool, comprising an intermediate body (11), wherein a cutting body (12) extending in the Y direction is provided at the X-direction end of the intermediate body (11), a gap (13) is formed between the cutting body (12) and the intermediate body (11) through the Z direction, and a main cutting edge (14) parallel to the X direction is provided at the Y-direction end of the cutting body (12).

2. The cutting tool according to claim 1, characterized in that, The Z-direction end face of the cutting body (12) is constructed as a rake face (15), and the main cutting edge (14) is located at the Y-direction end of the rake face (15), with a tool rake angle of 2° to 10°.

3. The cutting tool according to claim 2, characterized in that, A chip breaker groove (17) parallel to the X direction is provided at the X-direction end of the rake face (15).

4. The cutting tool according to claim 1, characterized in that, The Y-direction end face of the cutting body (12) is constructed as a back face (16), the main cutting edge (14) is located at the Z-direction end of the front face (15), and the tool clearance angle is -2° to -10°.

5. The cutting tool according to any one of claims 1 to 4, characterized in that, A second cutting body (121) extending in the Y direction is provided at the X-direction end of the intermediate body (11), and the second cutting body (121) is rotationally symmetrical with the first cutting body (12).

6. A clamping assembly comprising a tool holder (2), a pressure plate (3), and a clamping screw (4), wherein the tool holder (2) is provided with a mounting groove (21) for mounting a tool (1), and the pressure plate (3) is disposed on the tool holder (2) by the clamping screw (4) parallel to the Y direction, thereby clamping the tool (1) mounted in the mounting groove (21), characterized in that, A fixing groove (22) is provided on the tool holder (2), and an insert plate (31) that can be adapted to the fixing groove (22) is provided on the pressure plate (3). After the insert plate (31) is adapted to the fixing groove (22), it can restrict the pressure plate (3) from moving relative to the tool holder (2) in the XY plane.

7. The clamping assembly according to claim 6, characterized in that, The pressure plate (3) is configured to be able to be inserted into the fixing groove (22) along the axial direction of the clamping screw (4).

8. The clamping assembly according to claim 6 or 7, characterized in that, A positioning element (32) is provided below the pressure plate (3), and a positioning groove (18) is provided on the cutting tool (1) for adapting to the positioning element (32).

9. The clamping assembly according to claim 6 or 7, characterized in that, A second positioning surface (23) is provided in the mounting groove (21) of the tool holder (2), and a first positioning surface (10) is provided on the tool (1) for adapting to the second positioning surface (23).

10. The clamping assembly according to claim 6 or 7, characterized in that, A cooling port (24) is provided on the tool holder (2), and the cooling port (24) is aligned with the main cutting edge of the tool (1).

11. A method for processing an annular groove, characterized in that, Includes the following steps: Step 1: Use a grooving tool to machine a square groove (51) in the hole by turning. Step 2: Using the cutting tool (1) according to any one of claims 1 to 5, machine an annular groove (52) with an inner diameter larger than that of the square groove at the end of the square groove by turning.

12. The processing method according to claim 11, characterized in that, In step one, a square groove (51) is first formed in the hole by rough machining with a grooving tool, and then the square groove (51) is finished by precision machining. In step two, the annular groove (52) is first formed by rough machining at the end of the square groove using the cutting tool (1) according to any one of claims 1 to 5, and then the annular groove (52) is finished machined.

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