A cutting tool assembly with high positioning capability and an indexable drill bit

Abstract

This invention discloses a cutting tool assembly with high positioning capability and an indexable drill bit. The cutting tool assembly with high positioning capability includes an inner indexable cutting tool and an outer indexable cutting tool. The inner indexable cutting tool includes an inner cutter body, and a plurality of first cutting edges, a plurality of first cusp areas, and a plurality of long arc edges are all disposed at one end of the inner cutter body, wherein the first cutting edges are concave towards the center of the inner cutter body. The outer indexable cutting tool includes an outer cutter body, and a plurality of second cutting edges and a plurality of third cutting edges, a plurality of second cusp areas and a plurality of third cusp areas, and a plurality of first diagonal arc edges and a plurality of second diagonal arc edges are respectively disposed at both ends of the outer cutter body, wherein the second and third cutting edges are concave towards the center of the outer cutter body; wherein the first cusp areas and the second or third cusp areas are located in the same plane. The technical advantage of this invention is that it not only has high positioning capability but also good force balance.

Description

Technical Field

[0001] This invention relates to the field of drill bit technology, and more specifically to a cutting tool assembly with high positioning capability and an indexable drill bit. Background Technology

[0002] Indexable drill bits are a type of drill bit with indexable cutting tools. They have the advantage of high cutting tool utilization and are widely used in automated equipment such as CNC machine tools, machining centers, and turret lathes.

[0003] During the cutting process, the inner and outer cutting edges of indexable drills contact the workpiece sequentially, which can easily lead to two centers of rotation. This results in poor force balance and low positioning capability. Furthermore, indexable drills typically distribute the cutting amount of the inner and outer cutting edges by moving them radially or axially along the drill body. This can lead to a small adjustment range for the cutting amount of the inner and outer cutting edges, making it difficult to meet the appropriate cutting amount ratio requirements, further contributing to poor force balance. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a cutting tool assembly and an indexable drill bit with high positioning capability, which not only has high positioning capability but also good force balance.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] A cutting tool assembly with high positioning capability includes an inner indexable cutting tool and an outer indexable cutting tool;

[0007] The internal indexable insert includes an inner cutter body, and a plurality of first cutting edges, a plurality of first cusp areas and a plurality of long arc edges are provided at one end of the inner cutter body. The first cusp areas are located between the first cutting edges and the long arc edges, and the first cutting edges are recessed toward the center of the inner cutter body.

[0008] The indexable insert includes an outer cutter body, each having a plurality of second cutting edges and a plurality of third cutting edges, a plurality of second cusp areas and a plurality of third cusp areas respectively disposed at both ends of the outer cutter body, as well as a plurality of first diagonal arc edges and a plurality of second diagonal arc edges, wherein the second cusp areas are located between the second cutting edges and the first diagonal arc edges, and the third cusp areas are located between the third cutting edges and the second diagonal arc edges, and both the second cutting edges and the third cutting edges are recessed toward the center of the outer cutter body;

[0009] The first cusp region and the second cusp region or the third cusp region are located in the same plane.

[0010] Optionally, the internally indexable insert further includes:

[0011] Several circular arc blades are provided at one end of the inner blade body;

[0012] A plurality of short circular arc blades are provided at one end of the inner blade body;

[0013] The short circular arc blade is located between the long circular arc blade and the edge circular arc blade.

[0014] Optionally, the long arc-shaped cutting edge protrudes away from the center of the inner blade body, the short arc-shaped cutting edge is recessed towards the center of the inner blade body, and the edge arc-shaped cutting edge protrudes away from the center of the inner blade body.

[0015] Optionally, the internal indexable insert further includes a first chip breaker groove located at one end of the internal insert body.

[0016] Optionally, the externally indexable insert further includes:

[0017] Several first transition arc edges and several second transition arc edges are respectively provided at both ends of the outer blade body;

[0018] Several first corner rounded edges and several second corner rounded edges are respectively provided at both ends of the outer blade body;

[0019] The first transition arc blade is located between the first diagonal arc blade and the first side arc blade, and the second transition arc blade is located between the second diagonal arc blade and the second side arc blade.

[0020] Optionally, both the first diagonal arc-shaped cutting edge and the second diagonal arc-shaped cutting edge protrude in a direction away from the center of the outer blade body, both the first transition arc-shaped cutting edge and the second transition arc-shaped cutting edge are recessed in a direction closer to the center of the outer blade body, and both the first corner arc-shaped cutting edge and the second corner arc-shaped cutting edge protrude in a direction away from the center of the outer blade body.

[0021] Optionally, the indexable insert further includes a second chip breaker groove and a third chip breaker groove respectively disposed at both ends of the outer insert body.

[0022] An indexable drill bit includes an assembly of cutting tools with high positioning capability, and further includes:

[0023] Drill bit body;

[0024] A shank connected to one end of the drill bit body;

[0025] Chip removal grooves provided on the drill bit body;

[0026] The inner indexable insert is detachably connected to one side of the other end of the drill bit body, and the outer indexable insert is detachably connected to the other side of the other end of the drill bit body. The area of ​​one end of the inner indexable insert is larger than the area of ​​the other end of the inner indexable insert. The axis of the inner indexable insert is parallel to the axis of the drill bit body. The axis of the outer indexable insert is at a first angle to the axis of the drill bit body. The distance between the axis of the inner indexable insert and the axis of the drill bit body is smaller than the distance between the axis of the outer indexable insert and the axis of the drill bit body.

[0027] Optionally, the first angle is in the range of 5-15°.

[0028] Optionally, the chip removal groove is spiral in shape.

[0029] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0030] 1) Because the first cutting edge is recessed towards the center of the inner tool body, the degree of recess of the inner indexable insert can be adjusted during manufacturing to reasonably avoid the material being cut, thereby adjusting the cutting amount of the inner indexable insert. This results in a large adjustment range for the cutting amount of the inner indexable insert, making it easier to meet the appropriate requirements for the cutting amount ratio of the inner and outer indexable inserts. When this insert is used in an indexable drill bit, it gives the indexable drill bit good force balance.

[0031] 2) Since both the second and third cutting edges are recessed towards the center of the outer tool body, the degree of recess of the outer indexable insert can be adjusted during manufacturing to reasonably avoid the material being cut, thereby adjusting the cutting amount of the outer indexable insert. This results in a large adjustment range for the cutting amount of the outer indexable insert, making it easier to meet the appropriate requirements for the cutting amount ratio of the inner and outer indexable inserts, thus giving the indexable drill bit good force balance.

[0032] 3) Since the first and second or third cusp areas are located in the same plane, when this cutting tool combination is used in an indexable drill bit, it facilitates the indexable drill bit to have high positioning capability. Moreover, during the cutting process, the inner and outer indexable cutting tools of the indexable drill bit contact the material being cut simultaneously, preventing the indexable drill bit from having two centers of rotation, and further enabling the indexable drill bit to have good force balance. Attached Figure Description

[0033] Figure 1 This is one of the structural schematic diagrams of an indexable drill bit proposed in an embodiment of the present invention;

[0034] Figure 2This is a second schematic diagram of the structure of an indexable drill bit proposed in an embodiment of the present invention;

[0035] Figure 3 This is one of the partial structural schematic diagrams of an indexable drill bit proposed in an embodiment of the present invention;

[0036] Figure 4 This is a second partial structural schematic diagram of an indexable drill bit proposed in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the internally indexable cutting tool proposed in an embodiment of the present invention;

[0038] Figure 6 This is the third partial structural schematic diagram of an indexable drill bit proposed in an embodiment of the present invention;

[0039] Figure 7 This is the fourth partial structural schematic diagram of an indexable drill bit proposed in an embodiment of the present invention;

[0040] Figure 8 This is a schematic diagram of the structure of the externally indexable cutting tool proposed in an embodiment of the present invention;

[0041] In the diagram: 1. Inner indexable insert; 11. Inner cutter body; 12. First cutting edge; 13. Long arc cutting edge; 14. First cusp area; 15. Edge arc cutting edge; 16. Short arc cutting edge; 17. First chip breaker groove; 2. Outer indexable insert; 21. Outer cutter body; 221. Second cutting edge; 222. Third cutting edge; 231. First diagonal arc cutting edge; 232. Second diagonal arc cutting edge; 241. Second cusp area; 242. Third cusp area; 251. First transition arc cutting edge; 252. Second transition arc cutting edge; 261. First corner arc cutting edge; 262. Second corner arc cutting edge; 271. Second chip breaker groove; 272. Third chip breaker groove; 3. Drill body; 4. Shank; 5. Chip breaker groove; 6. First angle; 7. First clearance angle; 8. Second clearance angle; 9. Axis. Detailed Implementation

[0042] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0043] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 invention and simplifying the description, not to 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 invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections 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 invention based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0044] Example 1

[0045] Combined with appendix Figure 1-8 This embodiment provides a blade assembly with high positioning capability, including an inner indexable blade 1 and an outer indexable blade 2;

[0046] like Figure 5 The inner indexable insert 1 includes an inner cutter body 11, and a plurality of first cutting edges 12, a plurality of first tip areas 14 and a plurality of long arc edges 13 are provided at one end of the inner cutter body 11. The first tip areas 14 are located between the first cutting edges 12 and the long arc edges 13, and the first cutting edges 12 are recessed towards the center of the inner cutter body 11.

[0047] like Figure 8The indexable insert 2 includes an outer cutter body 21, and several second cutting edges 221 and several third cutting edges 222, several second cusp areas 241 and several third cusp areas 242, and several first diagonal arc edges 231 and several second diagonal arc edges 232 are respectively provided at both ends of the outer cutter body 21. The second cusp area 241 is located between the second cutting edge 221 and the first diagonal arc edge 231, and the third cusp area 242 is located between the third cutting edge 222 and the second diagonal arc edge 232. The second cutting edge 221 and the third cutting edge 222 are both recessed towards the center of the outer cutter body 21.

[0048] The first cusp region 14 and the second cusp region 241 or the third cusp region 242 are located in the same plane.

[0049] Specifically, the inner cutter body 11 is used to support a plurality of first cutting edges 12 and a plurality of first tip areas 14, etc.; the plurality of first cutting edges 12 are used for cutting. Since the plurality of first cutting edges 12 are located at one end of the inner cutter body 11, it is convenient for the inner indexable insert 1 to achieve single-sided indexability, thereby increasing the utilization rate of the inner indexable insert 1. The number of first cutting edges 12 is not limited, preferably four. Since the first cutting edges 12 are recessed towards the center of the inner cutter body 11, it is convenient to adjust the degree of recess of the inner indexable insert 1 during manufacturing according to the requirements, so as to reasonably avoid the material being cut, thereby adjusting the cutting amount of the inner indexable insert 1. This makes the adjustment range of the cutting amount of the inner indexable insert 1 large, which is convenient to meet the appropriate requirements of the cutting amount ratio of the inner indexable insert 1 and the outer indexable insert 2. When this insert combination is used in an indexable drill bit, it makes the indexable drill bit have good force balance; the plurality of first tip areas 14 are used for positioning; the plurality of long arc edges 13 are used for transition.

[0050] The outer tool body 21 is used to support a plurality of second cutting edges 221, a plurality of third cutting edges 222, a plurality of second tip areas 241, and a plurality of third tip areas 242, etc.; the plurality of second cutting edges 221 and the plurality of third cutting edges 222 are used for cutting. Since the plurality of second cutting edges 221 and the plurality of third cutting edges 222 are respectively provided at both ends of the outer tool body 21, it is convenient for the outer indexable insert 2 to achieve double-sided indexability, thereby increasing the utilization rate of the outer indexable insert 2. The specific number of second cutting edges 221 and third cutting edges 222 is not limited, but preferably three. All cutting edges 222 are recessed towards the center of the outer cutter body 21, which allows for adjustment of the degree of recess during manufacturing to reasonably avoid the material being cut, thereby adjusting the cutting amount of the outer indexable insert 2. This results in a large adjustment range for the cutting amount of the outer indexable insert 2, making it easier to meet the appropriate requirements for the cutting amount ratio of the inner indexable insert 1 and the outer indexable insert 2, thus giving the indexable drill bit good force balance. Several second cusp areas 241 and several third cusp areas 242 are used for positioning; several first diagonal arc cutting edges 231 and several second diagonal arc cutting edges 232 are used for transition.

[0051] Since the first cusp area 14 and the second cusp area 241 or the third cusp area 242 are located in the same plane, when this insert combination is used in an indexable drill bit, it facilitates the indexable drill bit to have a high positioning capability. Moreover, during the cutting process, the inner indexable insert 1 and the outer indexable insert 2 of the indexable drill bit simultaneously contact the material being cut, preventing the indexable drill bit from generating two centers of rotation, and further enabling the indexable drill bit to have good force balance.

[0052] Furthermore, such as Figure 5 The internal indexable insert 1 also includes:

[0053] Several edge arc blades 15 are provided at one end of the inner blade body 11;

[0054] Several short circular arc blades 16 are provided at one end of the inner blade body 11;

[0055] Among them, the short circular arc blade 16 is located between the long circular arc blade 13 and the edge circular arc blade 15.

[0056] Specifically, several edge arc-shaped cutting edges 15 are used to remove the sharp edges of the inner indexable insert 1, effectively preventing stress concentration in the inner indexable insert 1; several short arc-shaped cutting edges 16 are used for transition.

[0057] Furthermore, the long arc blade 13 protrudes away from the center of the inner blade body 11, the short arc blade 16 is recessed towards the center of the inner blade body 11, and the edge arc blade 15 protrudes away from the center of the inner blade body 11.

[0058] Specifically, this allows the edge of the inner indexable insert 1 to have an alternating concave and convex shape, thus giving the inner indexable insert 1 a wavy edge. This facilitates the smooth transition of the edge of the inner indexable insert 1 and effectively prevents stress concentration in the inner indexable insert 1.

[0059] Furthermore, the internal indexable insert 1 also includes a first chip breaker groove 17 located at one end of the internal cutter body 11.

[0060] Specifically, the first chip breaker groove 17 is used to break chips, thereby reducing the size of the waste chips. When the blade assembly is used in an indexable drill bit, it facilitates increased chip removal smoothness of the indexable drill bit.

[0061] Furthermore, such as Figure 8 The externally indexable insert 2 also includes:

[0062] Several first transition arc blades 251 and several second transition arc blades 252 are respectively provided at both ends of the outer blade body 21;

[0063] Several first corner rounded blades 261 and several second corner rounded blades 262 are respectively provided at both ends of the outer blade body 21;

[0064] The first transition arc blade 251 is located between the first diagonal arc blade 231 and the first side arc blade 261, and the second transition arc blade 252 is located between the second diagonal arc blade 232 and the second side arc blade 262.

[0065] Specifically, a number of first transition arc blades 251 and a number of second transition arc blades 252 are used for transition; a number of first corner arc blades 261 and a number of second corner arc blades 262 are used to remove the sharp edges of the outer indexable insert 2, effectively preventing stress concentration in the outer indexable insert 2.

[0066] Furthermore, the first diagonal arc blade 231 and the second diagonal arc blade 232 both protrude in a direction away from the center of the outer blade body 21, the first transition arc blade 251 and the second transition arc blade 252 both indent in a direction closer to the center of the outer blade body 21, and the first corner arc blade 261 and the second corner arc blade 262 both protrude in a direction away from the center of the outer blade body 21.

[0067] Specifically, this allows the edge of the indexable insert 2 to have an alternating concave and convex shape, thus giving the indexable insert 2 a wavy edge. This increases the smoothness of the edge transition and effectively prevents stress concentration in the indexable insert 2.

[0068] Furthermore, the indexable insert 2 also includes a second chip breaker groove 271 and a third chip breaker groove 272 respectively located at both ends of the outer cutter body 21.

[0069] Specifically, the second chip breaker groove 271 and the third chip breaker groove 272 are used to break chips, thereby reducing the size of the waste chips. When the cutting tool assembly is used in an indexable drill bit, it facilitates increased chip removal smoothness of the indexable drill bit.

[0070] Example 2

[0071] Combined with appendix Figure 1-8 This embodiment provides an indexable drill bit, including a cutting tool assembly with high positioning capability as described in Embodiment 1, such as... Figure 1-4 And 6-7, also includes:

[0072] Drill bit body 3;

[0073] The shank 4 is connected to one end of the drill bit body 3;

[0074] Chip removal groove 5 is provided on the drill bit body 3;

[0075] The inner indexable insert 1 is detachably connected to one side of the other end of the drill bit body 3, and the outer indexable insert 2 is detachably connected to the other side of the other end of the drill bit body 3. The area of ​​one end of the inner indexable insert 1 is larger than the area of ​​the other end of the inner indexable insert 1. The axis 9 of the inner indexable insert 1 and the drill bit body 3 are parallel. The axis 9 of the outer indexable insert 2 and the drill bit body 3 have a first angle 6. The distance between the axis 9 of the inner indexable insert 1 and the drill bit body 3 is smaller than the distance between the axis 9 of the outer indexable insert 2 and the drill bit body 3.

[0076] Specifically, the drill body 3 supports the shank 4, chip flute 5, inner indexable insert 1, and outer indexable insert 2, etc.; the shank 4 is used to cooperate with relevant drilling equipment, thereby facilitating the cooperation between the indexable drill bit and relevant drilling equipment. The shank 4 can be a general-purpose shank, a right-angle shank, or a tone shank, etc.; the chip flute 5 is used for chip removal; since the area of ​​one end of the inner indexable insert 1 is larger than the area of ​​the other end of the inner indexable insert 1, it is convenient for the inner indexable insert 1 to have a first cutting clearance angle 7, thereby ensuring that the inner indexable insert 1 can cut smoothly. Therefore, when installing the inner indexable insert 1, it is only necessary to make the inner indexable insert 1 and the axis 9 of the drill body 3 parallel; The outer indexable insert 2 has several second cutting edges 221 and several third cutting edges 222 at both ends, which means that the outer indexable insert 2 itself cannot have a second cutting rake angle 8. Therefore, by setting a first angle 6 between the outer indexable insert 2 and the axis 9 of the drill body 3, the outer indexable insert 2 can generate a second cutting rake angle 8 through a specific installation method, thereby ensuring that the outer indexable insert 2 can perform cutting smoothly. Since the distance between the inner indexable insert 1 and the axis 9 of the drill body 3 is smaller than the distance between the outer indexable insert 2 and the axis 9 of the drill body 3, it is convenient to make the inner indexable insert 1 as the inner insert and the outer indexable insert 2 as the outer insert.

[0077] Furthermore, the first angle 6 ranges from 5 to 15°.

[0078] Specifically, the first angle 6 can be 5°, 10°, or 15°, etc.

[0079] Furthermore, the chip removal groove 5 is spiral in shape.

[0080] Specifically, the spiral shape facilitates increased chip-holding capacity of the chip removal groove 5.

[0081] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A blade assembly having high positioning capability, characterized by The inner indexable insert and the outer indexable insert are provided. The inner indexable insert comprises an inner insert body, a plurality of first cutting edges, a plurality of first sharp point regions and a plurality of long circular-arc edges, which are all arranged at one end of the inner insert body, wherein the first sharp point regions are located between the first cutting edges and the long circular-arc edges, and the first cutting edges are recessed towards the center of the inner insert body. The outer indexable insert comprises an outer insert body, a plurality of second cutting edges and a plurality of third cutting edges, a plurality of second sharp point regions and a plurality of third sharp point regions, and a plurality of first diagonal circular-arc edges and a plurality of second diagonal circular-arc edges, which are all arranged at two ends of the outer insert body respectively, wherein the second sharp point regions are located between the second cutting edges and the first diagonal circular-arc edges, the third sharp point regions are located between the third cutting edges and the second diagonal circular-arc edges, and the second cutting edges and the third cutting edges are recessed towards the center of the outer insert body. The first sharp point regions and the second sharp point regions or the third sharp point regions are located in the same plane. The outer indexable insert further comprises: a plurality of first transition circular-arc edges and a plurality of second transition circular-arc edges, which are arranged at two ends of the outer insert body respectively; a plurality of first edge corner circular-arc edges and a plurality of second edge corner circular-arc edges, which are arranged at two ends of the outer insert body respectively; The first transition circular-arc edges are located between the first diagonal circular-arc edges and the first edge corner circular-arc edges, and the second transition circular-arc edges are located between the second diagonal circular-arc edges and the second edge corner circular-arc edges. The first diagonal circular-arc edges and the second diagonal circular-arc edges are convex towards the center of the outer insert body, the first transition circular-arc edges and the second transition circular-arc edges are recessed towards the center of the outer insert body, and the first edge corner circular-arc edges and the second edge corner circular-arc edges are convex towards the center of the outer insert body. The inner indexable insert further comprises: a plurality of edge circular-arc edges arranged at one end of the inner insert body; a plurality of short circular-arc edges arranged at one end of the inner insert body; The short circular-arc edges are located between the long circular-arc edges and the edge circular-arc edges. The long circular-arc edges are convex towards the center of the inner insert body, the short circular-arc edges are recessed towards the center of the inner insert body, and the edge circular-arc edges are convex towards the center of the inner insert body.

2. The blade assembly with high positioning capability according to claim 1, characterized in that, The inner indexable insert further comprises a first chip-breaker groove arranged at one end of the inner insert body.

3. The blade assembly with high positioning capability according to claim 1, wherein, The outer indexable insert further comprises a second chip-breaker groove and a third chip-breaker groove arranged at two ends of the outer insert body respectively.

4. An indexable drill bit, characterized by The drill bit further comprises: a drill bit body; a shank connected to one end of the drill bit body; a chip flute arranged on the drill bit body; The inner indexable insert is detachably connected to one side of the other end of the drill bit body, the outer indexable insert is detachably connected to the other side of the other end of the drill bit body, one end of the inner indexable insert has a larger area than the other end of the inner indexable insert, the axis of the inner indexable insert is parallel to the axis of the drill bit body, the outer indexable insert has a first angle with the axis of the drill bit body, and the distance between the axis of the inner indexable insert and the axis of the drill bit body is smaller than the distance between the axis of the outer indexable insert and the axis of the drill bit body.

5. The indexable drill according to claim 4, characterized in that The first angle ranges from 5 to 15 degrees.

6. The indexable drill according to claim 4, characterized in that The shape of the chip flute is spiral.

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