A ring slotting cutter and machine tool

Abstract

The application discloses a ring-shaped slotting cutter and a machine tool, and belongs to the technical field of cutting processing, which solves the problem of easy wear of the connecting part of the existing slotting cutter. The cutter comprises a blade, the blade comprises a cutter body and a cutter head, six cutter heads are arranged at equal intervals around the cutter body and are integrally connected with the cutter body, and an arc transition part is arranged between the cutter head and the cutter body; a flower-shaped positioning hole body is arranged in the middle part of the cutter body; a cutter rod is arranged, the end part of the cutter rod is provided with a flower-shaped positioning groove; a core sleeve is arranged, the core sleeve is matched with the positioning hole body and the positioning groove, both ends of the core sleeve are respectively inserted into the positioning hole body and the positioning groove, and a locking screw is rotatably connected with the cutter rod through the core sleeve, so as to fix the blade, the core sleeve and the cutter rod. The middle part of the cutter body is provided with the flower-shaped positioning hole body, the end part of the cutter rod is provided with the flower-shaped positioning groove, the core sleeve is matched with the positioning hole body and the positioning groove, the flower-shaped mounting and matching structure can effectively disperse the radial load, reduce the load of the locking screw, and reduce the wear between the locking screw and the cutter body and the cutter rod.

Description

Technical Field

[0001] This invention relates to the field of cutting technology, and more particularly to a ring-shaped grooving tool and a machine tool. Background Technology

[0002] With the rapid development of the small parts industry and general industries, automated and efficient processing has become an inevitable trend. The market has placed higher demands on the radial grooving of slender 316L stainless steel shaft parts with small diameter (less than 8mm), requiring both dimensional accuracy of continuous and equally spaced grooving on the workpiece and surface quality of the machined surface.

[0003] Currently, mainstream manufacturers primarily use a grooving cutter (500mm) to perform radial grooving on small-diameter (less than 8mm) 316L stainless steel slender shaft components, as mentioned above. Please refer to... Figures 13 to 16 The existing grooving insert 500 relies on the cooperation of surfaces A and B with surfaces E and F on a conventional tool holder, combined with the use of screws and threaded holes, to achieve the positioning of the double-edged single-sided cutter 510. The screws and threaded holes also bear a considerable portion of the lateral load, so the bending and torsional deformation of the double-edged single-sided cutter 510 under load will transmit additional load to the screws and threaded holes, which will accelerate the wear of the threaded holes. Summary of the Invention

[0004] In view of this, it is necessary to provide a ring grooving cutter and machine tool to solve the problem of easy wear at the connection of existing grooving cutters.

[0005] On one hand, the present invention provides an annular groove cutter, comprising:

[0006] The blade includes a blade body and a blade tip. The blade tip is equidistantly arranged around the blade body and integrally connected to the blade body. An arc transition portion is provided between the blade tip and the blade body. A flower-shaped positioning hole is provided in the middle of the blade body.

[0007] A tool holder, the end of which is provided with a flower-shaped positioning groove;

[0008] The core sleeve is adapted to the positioning hole and the positioning groove. The two ends of the core sleeve are respectively inserted into the positioning hole and the positioning groove. The locking screw is screwed to the tool bar through the core sleeve to fix the blade, the core sleeve and the tool bar.

[0009] In some embodiments, the back face of the cutter head is connected to the cutter body through the arc transition portion, and the arc radius of the arc transition portion is R1.

[0010] In some embodiments, the positioning hole includes a protrusion and a groove arranged axially around the blade body, with at least two protrusions equidistantly spaced and the groove disposed between two adjacent protrusions.

[0011] In some embodiments, the bottom surface of the groove is inclined relative to the axial direction of the tool body, and the bottom surface of the groove is inclined relative to the tool bar from the side away from the tool bar.

[0012] In some embodiments, the shape of the inner contour of the positioning hole cross section is consistent with the shape of the inner contour of the positioning groove cross section and the shape of the outer contour of the core sleeve cross section.

[0013] In some embodiments, the core sleeve is tapered from the middle to both ends, and the two ends of the core sleeve can be respectively engaged with the positioning hole and the positioning groove.

[0014] In some embodiments, the core sleeve is provided with at least two symmetrically arranged slots, which are opened on the outside of the core sleeve and arranged around the axis of the core sleeve.

[0015] In some embodiments, the core sleeve has a connecting hole in the middle, which is adapted to a locking screw.

[0016] In some embodiments, the center of the positioning groove is provided with a screw hole that is embedded inside the tool bar, and the locking screw passes through the connecting hole and is screwed into the screw hole.

[0017] On one hand, the present invention provides a machine tool including the aforementioned annular grooving cutter, the annular grooving cutter being mounted on the machine tool.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) The present invention provides an annular grooved cutter and a machine tool, wherein the middle part of the cutter body is provided with a flower-shaped positioning hole, the end of the cutter bar is provided with a flower-shaped positioning groove, the core sleeve is adapted to the positioning hole and the positioning groove, and the flower-shaped mounting and fitting structure can effectively disperse the radial load, reduce all the load of the locking screw, and reduce the wear between the locking screw and the cutter body and the cutter bar.

[0020] (2) The present invention provides a ring-shaped grooving tool and a machine tool. The tool includes a tool body and six cutting heads, which are integrally connected to the tool body. The six cutting heads are equidistantly arranged around the tool body. The tool adopts a ring-shaped, evenly distributed six-cutting-head structure, making the overall structure of the tool exhibit a centrally symmetrical structure. The tool has good stability during use. When the cutting head is subjected to load and impact, the degree of lateral torsional deformation of the cutting head is reduced, making the stress deformation of the cutting head more balanced, effectively improving the load-bearing and impact resistance of the cutting head. Moreover, the damage of a single cutting head has little impact on the overall structural strength of the tool, improving the economy and practicality of the tool.

[0021] (3) The present invention provides an annular grooved cutter and a machine tool, wherein an arc transition portion is provided between the cutter head and the cutter body. The arc transition portion makes the cross-sectional area of ​​the cutter head larger than that of the traditional β-angle inclined surface structure, which can effectively improve the load-bearing and impact resistance of the cutter head and make the structural strength of the cutter head higher. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is an exploded structural diagram of the entire invention;

[0024] Figure 2 This is a schematic diagram of the overall assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the tool holder structure in this invention;

[0026] Figure 4 This is a three-dimensional structural diagram of the blade in this invention;

[0027] Figure 5 This is a cross-sectional view of the blade in this invention;

[0028] Figure 6 yes Figure 5 A magnified structural diagram of point A;

[0029] Figure 7 This is a top view of the blade structure in this invention;

[0030] Figure 8 yes Figure 7 A magnified structural diagram of point B;

[0031] Figure 9 This is a three-dimensional structural diagram of the core sleeve in this invention;

[0032] Figure 10 This is a cross-sectional view of the core sleeve in this invention;

[0033] Figure 11 yes Figure 10 A magnified structural diagram of point C;

[0034] Figure 12 This is a schematic diagram of the disassembly of the caliper to the core sleeve in this invention;

[0035] Figure 13 This is a schematic diagram of the exploded structure of a grooving tool in the prior art;

[0036] Figure 14This is a schematic diagram of the structure of a double-edged single-sided blade in the prior art;

[0037] Figure 15 This is a schematic diagram of a partial structure of the tip of a double-edged, single-sided blade in the prior art;

[0038] Figure 16 This is a schematic diagram of a partial structure of the shank of a grooving tool in the prior art.

[0039] In the figure, there are blade 100, blade body 110, positioning hole body 111, protrusion 111a, groove 111b, cutting head 120, arc transition part 130, cutting bar 200, positioning groove 210, screw hole 220, core sleeve 300, connecting hole 310, slot 320, locking screw 400, grooving knife 500, double-edged single-sided knife 510, caliper 600, threaded rod 610, chuck 620, and threaded sleeve 630. Detailed Implementation

[0040] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0041] This embodiment presents an annular grooving cutter, applicable to the field of cutting technology. Mounted on a corresponding machine tool, it performs grooving operations on slender stainless steel shaft components. The symmetrical structure of the six cutting heads 120 reduces the lateral torsional deformation of the cutting heads 120 under load and impact, resulting in more balanced stress deformation and effectively improving the load-bearing and impact resistance of the cutting heads 120. The beveled rear face of the cutting head 120 combined with a large arc transition structure further enhances its structural strength. The flower-shaped mounting structure effectively disperses radial loads, reducing all loads on the locking screw 400 and minimizing wear between the locking screw 400 and the cutter body 110 and cutter shank 200.

[0042] It should be noted that the annular groove cutter of the present invention can be applied not only to the machining process of slender stainless steel shaft parts, but also to other mechanical cutting processes.

[0043] An annular groove cutter in one embodiment includes:

[0044] The blade 100 includes a blade body 110 and a blade head 120. Six blade heads 120 are equidistantly arranged around the blade body 110 and are integrally connected to the blade body 110. An arc transition portion 130 is provided between the blade head 120 and the blade body 110. A flower-shaped positioning hole 111 is provided in the middle of the blade body 110.

[0045] The tool holder 200 has a flower-shaped positioning groove 210 at its end;

[0046] The core sleeve 300 is adapted to the positioning hole 111 and the positioning groove 210. The two ends of the core sleeve 300 are respectively inserted into the positioning hole 111 and the positioning groove 210. The locking screw 400 is screwed to the tool bar 200 through the core sleeve 300 to fix the blade 100, the core sleeve 300 and the tool bar 200.

[0047] In this embodiment, please refer to Figures 1 to 3 The annular groove cutter mainly consists of three parts connected in sequence: a blade 100, a core sleeve 300, and a cutter bar 200. The two ends of the core sleeve 300 are respectively inserted into the blade 100 and the cutter bar 200. The locking screw 400 passes through the core sleeve 300 and is screwed to the cutter bar 200, thus fixing the blade 100, the core sleeve 300, and the cutter bar 200 together.

[0048] Please see Figures 4 to 8 The blade 100 includes a blade body 110 and six blade heads 120, which are integrally connected to the blade body 110. These six blade heads 120 are equidistantly arranged around the blade body 110. The blade 100 employs a ring-shaped, evenly distributed six-blade head 120 structure, resulting in a centrally symmetrical overall structure. This improves the stability of the blade 100 during use. When subjected to loads and impacts, the blade heads 120 exhibit reduced lateral torsional deformation, resulting in more balanced stress deformation and effectively enhancing their load-bearing and impact resistance. Furthermore, damage to a single blade head 120 has minimal impact on the overall structural strength of the blade 100, thus improving its economy and practicality.

[0049] Meanwhile, in some embodiments, after a single cutting head 120 is damaged, the cutting head 100 can be rotated and other intact cutting heads 120 can be selected for processing, thereby further improving the utilization rate of the cutting head 100 and extending its service life.

[0050] An arc transition portion 130 is provided between the cutter head 120 and the cutter body 110. The arc transition portion 130 replaces the β-angle bevel structure of the existing grooving cutter 500. The arc transition portion 130 makes the cross-sectional area of ​​the cutter head 120 larger than that of the traditional β-angle bevel structure, which can effectively improve the load-bearing and impact resistance of the cutter head 120 and make the structural strength of the cutter head 120 higher.

[0051] When machining parts with a ring-shaped grooving cutter, the six-headed, evenly distributed, symmetrical structure of the insert 100 reduces the lateral torsional deformation of the head 120 under load and impact, resulting in more balanced stress deformation and effectively improving its load-bearing and impact resistance. Under periodic impacts, the portion of the head 120 closer to the tip experiences more severe bending moment deformation, with the bending moment increasing exponentially. The cross-sectional area of ​​the arc transition section 130 is larger than that of the traditional β-angle inclined surface structure, effectively enhancing the load-bearing and impact resistance of the head 120 and increasing its structural strength.

[0052] It should be noted that compared with the traditional 500-blade 100-blade double-edged single-sided four-corner bevel grooving cutter, the six-blade structure of the annular grooving cutter significantly improves the utilization rate of the tool material. The volume of the 100-blade is twice that of the 500-blade 100-blade double-edged single-sided four-corner bevel grooving cutter, and the number of blades of the annular grooving cutter is three times that of the 500-blade 100-blade double-edged single-sided four-corner bevel grooving cutter. The material utilization rate of the annular grooving cutter is directly increased by 50% compared with existing tools.

[0053] In some embodiments, please refer to Figure 5 and Figure 6 The flank face of the cutter head 120 is connected to the cutter body 110 via an arc transition portion 130, the radius of which is R1. The radial span between the tip of the cutter head 120 and the cutter body 110 is H1, where R1:H1 = 0.3-0.6. When the ratio of the arc radius to the radial span of the arc transition portion 130 is within the above range, the cross-sectional area of ​​the arc transition portion 130 is much larger than that of the conventional β-angle inclined plane structure, significantly enhancing the load-bearing and impact resistance of the cutter head 120 and resulting in higher structural strength.

[0054] In some embodiments, please refer to Figure 7 and Figure 8 The side slip angle of the cutting head 120 is σ, the transition fillet size connecting the cutting head 120 and the cutting body 110 is R2, the flank face of the cutting head 120 is connected to the cutting body 110 via an arc transition portion 130 with an arc size of R1, and the first clearance angle of the cutting head 120 is γ. (See also...) Figures 13 to 16 The avoidance angles α, β, and θ are all the avoidance angles of the existing double-edged single-sided cutting tools, which meet the design specifications and national standards.

[0055] Where σ = θ / 2, angles α and θ are standard parameters of existing grooving tools, angle γ is equal to angle α, and the side slip angle σ and the first clearance angle γ are both clearance angles, which can provide machining clearance space during grooving. The transition fillet R2 can avoid stress concentration at the tool tip 120 and prevent stress damage at the root of the tool tip 120.

[0056] In some embodiments, please continue reading Figures 4 to 7 The cutter body 110 has a flower-shaped positioning hole 111 in the middle and a flower-shaped positioning groove 210 at the end of the cutter bar 200. The core sleeve 300 is adapted to the positioning hole 111 and the positioning groove 210. The flower-shaped mounting and mating structure can effectively distribute the radial load, reduce all the load on the locking screw 400, and reduce the wear between the locking screw 400 and the cutter body 110 and the cutter bar 200.

[0057] Please see Figure 7 In a further embodiment, the positioning hole 111 includes a protrusion 111a and a groove 111b arranged axially around the cutter body 110, with at least two protrusions 111a arranged at equal intervals and the groove 111b disposed between two adjacent protrusions 111a.

[0058] The protrusion 111a and the groove 111b can be inserted into the end of the core sleeve 300. Part of the core sleeve 300 is inserted into the groove 111b and the protrusion 111a is inserted into the core sleeve 300, thereby preventing the blade body 110 from rotating relative to the core sleeve 300 and completing the self-locking of the blade body 110 relative to the core sleeve 300.

[0059] Optionally, there are two protrusions 111a and two grooves 111b. The two grooves 111b are respectively set between the two protrusions 111a. The grooves 111b and the protrusions 111a form a flower-shaped positioning hole 111. The positioning hole 111 can prevent the core sleeve 300 from rotating relative to the blade 100, so as to realize the self-locking of the blade body 110 relative to the core sleeve 300.

[0060] Optionally, there are three protrusions 111a and three grooves 111b. The three grooves 111b are respectively set between two adjacent protrusions 111a. The grooves 111b and the protrusions 111a form a flower-shaped positioning hole 111. The positioning hole 111 can prevent the core sleeve 300 from rotating relative to the blade 100, so as to realize the self-locking of the blade body 110 relative to the core sleeve 300.

[0061] Optionally, there are four protrusions 111a and four grooves 111b. The four grooves 111b are respectively set between two adjacent protrusions 111a. The grooves 111b and the protrusions 111a form a flower-shaped positioning hole 111. The positioning hole 111 can prevent the core sleeve 300 from rotating relative to the blade 100, so as to realize the self-locking of the blade body 110 relative to the core sleeve 300.

[0062] Optionally, there are five protrusions 111a and five grooves 111b. The five grooves 111b are respectively set between two adjacent protrusions 111a. The grooves 111b and the protrusions 111a form a flower-shaped positioning hole 111. The positioning hole 111 can prevent the core sleeve 300 from rotating relative to the blade 100, so as to realize the self-locking of the blade body 110 relative to the core sleeve 300.

[0063] Optionally, there are six protrusions 111a and six grooves 111b. The six grooves 111b are respectively set between two adjacent protrusions 111a. The grooves 111b and the protrusions 111a form a flower-shaped positioning hole 111. The positioning hole 111 can prevent the core sleeve 300 from rotating relative to the blade 100, so as to realize the self-locking of the blade body 110 relative to the core sleeve 300.

[0064] Please see Figure 4 , Figure 9 as well as Figure 3 To match the different embodiments described above, the shape of the inner contour of the positioning hole 111 is consistent with the shape of the inner contour of the positioning groove 210 and the shape of the outer contour of the core sleeve 300. The two ends of the core sleeve 300 are connected to the positioning hole 111 and the positioning groove 210, which have the same flower-shaped contour, to achieve axial locking of the three and prevent the blade 100 from rotating axially.

[0065] In fact, the core sleeve 300 is provided with a recessed part that matches the protrusion 111a and a protruding part that matches the groove 111b. The outer part of the core sleeve 300 fits into the inner cavity of the positioning hole 111 and the inner cavity of the positioning groove 210.

[0066] The root of the groove 111b of the positioning hole body 111, the protrusion 111a of the positioning hole body 111, the root of the recess and protrusion of the core sleeve 300, and the root of the positioning groove 210 are all rounded transition structures, which can avoid stress concentration problems in these parts when bearing load, thereby improving the overall service life of the tool.

[0067] In some embodiments, please refer to Figure 5 The bottom surface of the groove 111b is inclined relative to the axis of the tool body 110, and the bottom surface of the groove 111b is inclined relative to the tool shank 200 from the side away from the tool shank 200. The inclination angle of the bottom surface of the groove 111b relative to the axis of the tool body 110 is η, where η = 1° to 8°. This inclination angle η, combined with the flower-shaped structure, gives the insert 100 a certain self-locking function during cutting. The weight of the insert 100 itself, plus the cutting force acting on the insert 100 during cutting, will press the annular groove insert 100 tightly against the core sleeve 300. The pressure increases with the increase of the cutting force.

[0068] In some embodiments, the core sleeve 300 is tapered from the middle to both ends, and the two ends of the core sleeve 300 can be respectively engaged with the positioning hole body 111 and the positioning groove 210.

[0069] Please see Figures 9 to 11As one implementation, the main structure of the core sleeve 300 is a tapered columnar structure. The structure of the core sleeve 300 is based on the base plane N. Above the base plane N, there is a columnar body with an inclination angle of η and a height of h1. Below the base plane N, there is a columnar body with an inclination angle of η and a height of h2. The overall height of the core sleeve 300 is h3, where h3 = h1 + h2. The core sleeve 300 has 6 protrusions and 6 positioning recesses around its perimeter. Both the protrusions and recesses present an inclination angle of η based on the base plane N. The included angle between the two sides of the protrusion is 30°, and the included angle between the two walls of the recess is also 30°. Six recesses are alternately distributed around the core sleeve 300, giving the core sleeve 300 a flower-like cross-section. This flower-like cross-section, divided into upper and lower cylindrical sections with an inclination angle of η based on the base plane N, allows the core sleeve 300 to both mate with the positioning hole 111 and accurately position and self-lock the blade 100. Simultaneously, when the core sleeve 300 mates with the positioning groove 210 of the tool holder 200, it also achieves accurate positioning and self-locking. Both sides of the protrusion and recess have rounded transition structures, which prevent stress concentration under load and effectively improve the structural strength of the protrusion and recess of the core sleeve 300.

[0070] In some embodiments, the core sleeve 300 is provided with at least two symmetrically arranged slots 320, which are opened on the outside of the core sleeve 300 and arranged around the axis of the core sleeve 300.

[0071] The slot 320 is provided on the protrusion 111a of the core sleeve 300. There are at least two slots 320, and there can be two, three or four slots 320. The slots 320 are respectively provided on the protrusions 111a that are equidistant from each other. The slots 320 are perpendicular to the axial direction of the core sleeve 300. The slots 320, in conjunction with the caliper 600, can facilitate the removal of the core sleeve 300 from the tool holder 200.

[0072] Please see Figure 12 For example, the caliper 600 is generally a disassembly and assembly tool used by assembly fitters. By clamping the two symmetrical slots 320, the core sleeve 300 can be clamped, making it convenient for workers to remove the core sleeve 300 from the tool holder 200. In this invention, a multi-jaw caliper 600 is disclosed. The multi-jaw caliper 600 includes a threaded rod 610, multiple jaws 620, and a threaded sleeve 630. One end of the jaw 620 is connected to the end of the threaded rod 610 and opens outward. The threaded sleeve 630 is screwed onto the threaded rod 610. The threaded sleeve 630 can expand and retract the end of the jaw 620 by squeezing the jaw 620. The end of the jaw 620 away from the threaded rod 610 is provided with a mating part that cooperates with the slot 320. When clamping and retracting, the mating part can be embedded into the slot 320, thereby making it convenient for workers to remove the core sleeve 300 from the tool holder 200.

[0073] In some embodiments, please refer to Figure 10 and Figure 11 The core sleeve 300 has a connecting hole 310 in its middle, which is adapted to the locking screw 400. A chamfer is provided at one end of the connecting hole 310 opposite the nut of the locking screw 400. The angle between the chamfer and the end face of the core sleeve 300 is R3, which ranges from 45° to 75°. In some specific embodiments, R3 is selected as 55 degrees.

[0074] In addition, a circular arc transition structure is provided between the connecting hole 310 and the chamfer. The angle of the circular arc transition structure is R4, which allows the connecting hole 310 and the chamfer to be smoothly connected.

[0075] The chamfer and the arc transition structure with an angle of R4 can help the locking screw 400 to be inserted into the connecting hole 310 and provide a guiding effect for the locking screw 400; at the same time, it can also reduce the contact and wear between the locking screw 400 and the connecting hole 310.

[0076] The diameter of the connecting hole 310 is larger than that of the locking screw 400. When the locking screw 400 is turned, the connecting hole 310 will not interfere with the locking screw 400, thus preventing wear on the locking screw 400. The center of the positioning groove 210 is provided with a screw hole 220 that is embedded inside the tool shank 200. The locking screw 400 passes through the connecting hole 310 and screws into the screw hole 220. The nut of the locking screw 400 abuts against both the tool body 110 and the core sleeve 300. The stud of the locking screw 400 is screwed into the screw hole 220. The nut of the locking screw 400 has a cross-shaped opening for easy turning.

[0077] In a further embodiment, when the blade 100, the core sleeve 300, and the tool holder 200 are assembled together, the height of the core sleeve 300 is smaller than the sum of the depth of the positioning groove 210 and the depth of the positioning hole 111. After both ends of the core sleeve 300 are inserted into the blade 100 and the tool holder 200, one end of the core sleeve 300 relative to the blade 100 is lower than the end of the positioning hole 111. The core sleeve 300 retracts into the positioning hole 111. The core sleeve 300 and the nut of the locking screw 400 are spaced apart to ensure that the nut presses the blade 100 tightly.

[0078] A machine tool includes an annular grooving cutter, which is mounted on the machine tool. The annular grooving cutter has six cutting edges 120. When the machine tool performs radial grooving on slender stainless steel shaft parts, the commonly used cutting edges 120 may wear or be damaged due to use. The insert 100 can be removed from the core sleeve 300, and then the insert 100 can be rotated to make full use of the other intact cutting edges 120, thereby extending the service life of the annular grooving cutter.

[0079] In summary, the annular grooving cutter and machine tool provided by this invention can be applied to the field of cutting technology. Installed on a corresponding machine tool, it can be used for grooving slender stainless steel shaft components. The symmetrical structure of the six cutter heads 120 reduces the degree of lateral torsional deformation of the cutter heads 120 under load and impact, resulting in more balanced stress deformation and effectively improving the load-bearing and impact resistance of the cutter heads 120. The beveled surface of the flank face of the cutter head 120 combined with the large arc transition structure further enhances the structural strength of the cutter head 120. The flower-shaped mounting and fitting structure effectively disperses radial loads, reduces all loads on the locking screw 400, and minimizes wear between the locking screw 400 and the cutter body 110 and cutter shank 200.

[0080] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of the present invention.

Claims

1. A ring-shaped grooved cutter, characterized in that, include: The blade includes a blade body and a blade tip. The blade tip is equidistantly arranged around the blade body and integrally connected to the blade body. An arc transition portion is provided between the blade tip and the blade body. A flower-shaped positioning hole is provided in the middle of the blade body. A tool holder, the end of which is provided with a flower-shaped positioning groove; The core sleeve is adapted to the positioning hole and the positioning groove. The two ends of the core sleeve are respectively inserted into the positioning hole and the positioning groove. The locking screw is screwed to the tool bar through the core sleeve to fix the blade, the core sleeve and the tool bar. The positioning hole includes a protrusion and a groove arranged axially around the blade body, with at least two protrusions equidistantly spaced and the groove disposed between two adjacent protrusions; The shape of the inner contour of the positioning hole cross section is consistent with the shape of the inner contour of the positioning groove cross section and the shape of the outer contour of the core sleeve cross section. The core sleeve is tapered from the middle to both ends, and the two ends of the core sleeve can be respectively engaged with the positioning hole and the positioning groove. The core sleeve is provided with at least two symmetrically arranged slots, which are opened on the outside of the core sleeve and arranged around the axis of the core sleeve; The bottom surface of the groove is inclined relative to the axis of the tool body, and the bottom surface of the groove is inclined relative to the tool bar from the side away from the tool bar.

2. The annular grooved cutter according to claim 1, characterized in that, The back face of the cutter head is connected to the cutter body through the arc transition portion, and the arc radius of the arc transition portion is R1.

3. The annular grooved cutter according to claim 1, characterized in that, The core sleeve has a connecting hole in the middle, which is adapted to the locking screw.

4. The annular grooved cutter according to claim 3, characterized in that, The positioning groove has a screw hole in the middle that is embedded inside the tool bar, and the locking screw passes through the connecting hole and is screwed into the screw hole.

5. A machine tool, characterized in that, Includes the annular grooving cutter as described in any one of claims 1-4, wherein the annular grooving cutter is mounted on a machine tool.

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