A drill tool having a plurality of clamping units

Abstract

The application discloses a drilling tool with multiple clamping units, comprising a cutting part, a clamping part and a fastener, the bottom of the cutting part is provided with a bottom positioning surface, at least two sides are respectively provided with side positioning surfaces, one end of the clamping part is provided with a clamping groove part, the other end is provided with a handle part, the bottom surface of the clamping groove part is a bottom clamping surface, at least two sides are respectively provided with side clamping surfaces, the cutting part is clamped in the clamping groove part and is fixed through the fastener, at least one side positioning surface is provided with a peripheral side positioning part and a center positioning part which are respectively located at the periphery and the middle of the side positioning surface, the side clamping surface corresponding to the side positioning surface is provided with a peripheral side clamping part and a center side clamping part which are respectively located at the periphery and the middle of the side clamping surface, the peripheral side positioning part and the peripheral side clamping part and the center positioning part and the center side clamping part are in concave-convex cooperation. The drilling tool with multiple clamping units has the advantages of improving positioning accuracy, structural rigidity and assembly certainty.

Description

Technical Field

[0001] This invention relates to the field of metal cutting tool technology, and more specifically to a drilling tool having multiple clamping units. Background Technology

[0002] In the field of metal cutting, especially in high-precision, high-efficiency mass production, drilling tools often adopt a modular, split-structure design. This involves detachably mounting high-hardness, high-wear-resistant cutting components (such as carbide inserts) onto a flexible clamping component (such as an alloy steel tool holder). This design allows for the replacement of only the cutting components after the cutting edge wears, significantly reducing operating costs and improving resource utilization.

[0003] However, existing modular drilling tools generally rely on planar contact and screw fastening for assembly. While this structure is simple, it has significant limitations in practical applications: First, positioning depends entirely on the planar contact between the bottom and side surfaces, lacking an effective geometric interlocking mechanism. Under conditions of screw preload fluctuations, thermal deformation, or vibration impact, slight relative displacement can easily occur, leading to a decrease in repeatability accuracy. Second, the cutting force generated during the cutting process is mainly transmitted through friction. When the cutting load is large or the cutting condition is intermittent, the friction interface is prone to slippage, causing vibration, chipping, or even tool breakage. Third, due to the lack of a unique assembly constraint, ensuring the accuracy of both positive and negative assembly is extremely difficult to achieve in production, making it hard to guarantee assembly accuracy.

[0004] To improve connection reliability, the industry has tried various improvement schemes. For example, Chinese patent application CN202610498411.0 discloses a drilling tool with a concave-convex fit on the side. The cutting component includes an end cutting area, a bottom positioning surface, and a cutting side surface located between the end cutting area and the bottom positioning surface. The cutting side surface has multiple side cutting areas and multiple side positioning surfaces. The end cutting area and the side cutting area form the cutting area of ​​the cutting component. An internal mounting hole is opened on the side positioning surface. The clamping component includes a clamping groove and a shank. The clamping groove has a bottom clamping surface and a side clamping surface corresponding to the bottom positioning surface and the side positioning surface, respectively. At least one side positioning surface has a side positioning protrusion, and the side clamping surface corresponding to the side positioning surface has a side clamping recess. The side positioning protrusion and the side clamping recess form a concave-convex fit to determine the installation direction of the cutting component and realize the circumferential clamping and positioning of the cutting component, thereby transmitting the cutting torque and cutting force between the cutting component and the clamping component during the cutting process. The side positioning protrusion and side clamping recess of the drilling tool with the concave-convex fit on the side are general, undivided concave-convex fit structures, and usually adopt a single angle, which cannot effectively suppress vibration and chatter during high-speed cutting, so the surface quality of the machined part needs to be improved and the service life needs to be extended.

[0005] Therefore, there is an urgent need to develop a new type of drilling tool to fundamentally solve the technical bottlenecks of large vibrations and chatter, poor surface quality and service life during traditional high-speed cutting. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a drilling tool with multiple clamping units that effectively suppresses vibration and chatter during high-speed cutting, significantly improves the surface quality of the machined part and extends the tool's service life.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A drilling tool with multiple clamping units includes a cutting component, a clamping component, and fasteners. The cutting component has a bottom positioning surface and at least two side positioning surfaces. One end of the clamping component has a clamping groove and the other end has a shank. The bottom surface of the clamping groove is a bottom clamping surface, and at least two side clamping surfaces are provided. The cutting component is clamped in the clamping groove and fixed by fasteners. The bottom positioning surface and the bottom clamping surface are arranged opposite to each other, and the side positioning surface and the side clamping surface are arranged opposite to each other. At least one side positioning surface has a peripheral side positioning part and a center positioning part located at the periphery and center of the side positioning surface, respectively. The side clamping surface corresponding to the side positioning surface has a peripheral side clamping part and a center side clamping part located at the periphery and center of the side clamping surface, respectively. The peripheral side positioning part and the peripheral side clamping part... Both the central positioning part and the central side clamping part have a concave-convex fit, which is used to determine the unique installation direction of the cutting part, realize the circumferential positioning of the cutting part, and transmit the cutting torque and cutting force between the cutting part and the clamping part during the cutting process. The peripheral side positioning part includes a plurality of mutually parallel peripheral strip-shaped protrusions, the central positioning part includes a plurality of mutually parallel central strip-shaped protrusions, the peripheral side clamping part includes a plurality of mutually parallel peripheral strip-shaped recesses, and the central side clamping part includes a plurality of mutually parallel central strip-shaped recesses. Each peripheral strip-shaped protrusion and each peripheral strip-shaped recess has a one-to-one concave-convex fit, and each central strip-shaped protrusion and each central strip-shaped recess has a one-to-one concave-convex fit. The two sides of the peripheral strip-shaped protrusion form an included angle α, and the two sides of the central strip-shaped protrusion form an included angle β, satisfying: 5°≤α-β≤20°.

[0008] As a further improvement to the above technical solution: The angle between the insertion direction of the cutting component and the clamping groove and the rotation center axis of the clamping component is θ, which satisfies: 0°≤θ≤25°.

[0009] The two sides of the peripheral strip-shaped indentation form an included angle α', and the two sides of the central strip-shaped indentation form an included angle β', satisfying: 5°≤α'-β'≤20°.

[0010] The gap between the peripheral strip-shaped protrusion and the peripheral strip-shaped recess on one opposite side is λ1, and the gap between the central strip-shaped protrusion and the central strip-shaped recess on one opposite side is λ2, satisfying: 0≤λ1≤0.3mm, 0≤λ2≤0.3mm.

[0011] The gap between the peripheral strip-shaped protrusion and the peripheral strip-shaped indentation on the opposite side is λ3, and the gap between the central strip-shaped protrusion and the central strip-shaped indentation on the opposite side is λ4, satisfying: λ3=λ4=0.

[0012] The bottom positioning surface is provided with a bottom positioning part, and the bottom clamping surface is provided with a bottom clamping part. The bottom positioning part and the bottom clamping part are in concave-convex cooperation to transmit the torque and cutting force between the cutting part and the clamping part during the cutting process.

[0013] The bottom positioning part includes multiple positioning protrusions, and the bottom clamping part includes multiple clamping concave strips. Each positioning protrusion and each clamping concave strip are in one-to-one correspondence and fit together. The gap between one opposite side of the positioning protrusion and the clamping concave strip is λ5, and the gap between the other opposite side is λ6, satisfying: λ5=λ6=0.

[0014] The number of positioning protrusions is N3, and the number of clamping concave strips is M3, satisfying: 2≤N3≤8, 2≤M3≤8.

[0015] The peripheral strip-shaped protrusions on the side positioning surface are symmetrical about the positioning center line of the side positioning surface, and the peripheral strip-shaped recesses on the side clamping surface are symmetrical about the clamping center line of the side clamping surface; when the cutting component is separated from the clamping component, the angle between the clamping center line and the rotation center axis of the clamping component is γ2, and when the cutting component and the clamping component are assembled in place, the angle between the clamping center line and the rotation center axis of the clamping component is γ1, satisfying: 30'≤γ2-γ1≤2°.

[0016] Two side positioning surfaces are provided, located on opposite sides of the cutting component; two side clamping surfaces are provided, located on opposite sides of the clamping groove; each side positioning surface is provided with a peripheral side positioning part and a central positioning part; each side clamping surface is provided with a peripheral side clamping part and a central side clamping part.

[0017] The two side positioning surfaces and the two side clamping surfaces are symmetrically arranged relative to the rotation center axis of the clamping component; the peripheral side positioning part, the center positioning part, the peripheral side clamping part and the center side clamping part are all symmetrically distributed relative to the rotation center axis of the clamping component.

[0018] The cutting component has an inner mounting hole that extends to the side positioning surface. The clamping groove has an outer mounting hole that extends to the side clamping surface. The fastener passes through the inner mounting hole and the outer mounting hole. The inner mounting hole has a hole center line, and the outer mounting hole has a machining center line. The machining center line forms an eccentric distance τ relative to the hole center line in the direction of the shank, satisfying: 0.05mm≤τ≤0.3mm.

[0019] The cutting component has an end cutting area at one end relative to the bottom positioning surface and a side cutting area on the side adjacent to the side positioning surface.

[0020] The peripheral positioning part includes multiple parallel side strip-shaped recesses, the central positioning part includes multiple parallel middle strip-shaped recesses, the peripheral clamping part includes multiple parallel side strip-shaped protrusions, and the central clamping part includes multiple parallel middle strip-shaped protrusions. Each side strip-shaped recess corresponds to and engages with each side strip-shaped protrusion, and each middle strip-shaped recess corresponds to and engages with each middle strip-shaped protrusion.

[0021] Compared with the prior art, the advantages of the present invention are as follows: The drilling tool of the present invention, having multiple clamping units, has a peripheral side positioning part and a central positioning part located at the periphery and center of the side positioning surface, respectively, on at least one side positioning surface. A peripheral side clamping part and a central side clamping part located at the periphery and center of the side clamping surface, respectively, are also provided on the side clamping surface corresponding to the side positioning surface. The peripheral side positioning part and the peripheral side clamping part, and the central positioning part and the central side clamping part, are in concave-convex fit, forming a peripheral and central concave-convex fit structure, thereby forming multiple peripheral and central clamping units. Through the central concave-convex fit and the peripheral concave-convex fit structure, the unique installation direction of the cutting component is determined, and the circumferential clamping and positioning of the cutting component is achieved. This transmits the cutting torque and cutting force between the cutting component and the clamping component during the cutting process. Furthermore, it achieves geometric forced positioning and circumferential locking between the cutting component and the clamping component. Combined with the fasteners mounted on the side, it effectively restricts the radial and axial degrees of freedom of the cutting component, eliminates the micro-motion error that may be caused by planar positioning in the prior art, improves the repeatability of the tool's positioning, and ensures the consistency of batch-processed holes. The peripheral and central concave-convex mating structure directly transmits the torque and cutting force generated during cutting through the convex-concave contact surfaces, rather than relying solely on the friction of fasteners. This "shape-lock" connection significantly improves the overall rigidity of the drilling tool, effectively balancing positioning accuracy, structural rigidity, and assembly certainty. Multiple peripheral strip-shaped protrusions and recesses, as well as multiple central strip-shaped protrusions and recesses, ensure that the cutting load is evenly distributed across multiple contact points, preventing premature wear or breakage due to stress concentration. The peripheral strip-shaped protrusions employ a large included angle to enhance structural strength, efficiently distributing cutting force and torque while maintaining positioning strength and rigidity, thus improving vibration and impact resistance. The central strip-shaped protrusions employ a small included angle to enhance centering, ensuring central positioning accuracy and improving dimensional accuracy at the borehole entry point. This synergistic effect of central and peripheral partitioning effectively suppresses vibration and chatter during high-speed cutting while ensuring assembly feasibility, significantly improving surface finish and extending tool life.

[0022] The drilling tool of the present invention, which has multiple clamping units, adopts a differentiated angle design: the peripheral side positioning protrusions use a large included angle to enhance structural strength and efficiently distribute cutting forces and torque; the central positioning protrusion uses a small included angle to improve centering effect. This synergistic effect of the center and periphery effectively suppresses vibration and chatter during high-speed cutting while ensuring assembly feasibility, significantly improving the surface quality of the machined part and extending the tool's service life. Attached Figure Description

[0023] Figure 1 This is a perspective structural diagram of a first embodiment of the drilling tool having multiple clamping units according to the present invention.

[0024] Figure 2This is an exploded view of a first embodiment of the drilling tool having multiple clamping units of the present invention.

[0025] Figure 3 This is a diagram of the end face structure of a drilling tool with multiple clamping units according to the first embodiment of the present invention.

[0026] Figure 4 yes Figure 3 A sectional view of AA.

[0027] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0028] Figure 6 yes Figure 3 A magnified view of point C in the middle.

[0029] Figure 7 yes Figure 3 Enlarged view of point D in the middle.

[0030] Figure 8 This is a schematic diagram of the end structure of a drilling tool with multiple clamping units according to the first embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the clamping groove of a first embodiment of the drilling tool having multiple clamping units of the present invention.

[0032] Figure 10 This is a schematic diagram of the cutting component of a second embodiment of the drilling tool with multiple clamping units of the present invention.

[0033] Figure 11 This is a schematic diagram of the cutting component of a third embodiment of the drilling tool with multiple clamping units of the present invention.

[0034] The labels in the diagram represent: 1. Cutting component; 11. End cutting area; 12. Bottom positioning surface; 13. Side cutting area; 14. Side positioning surface; 15. Inner mounting hole; 151. Hole center line; 16. Peripheral side positioning part; 161. Peripheral strip-shaped protrusion; 1611. Inner straight positioning surface of peripheral strip-shaped protrusion; 1612. Outer straight positioning surface of peripheral strip-shaped protrusion; 162. Positioning center line; 163. Side strip-shaped recess; 17. Center positioning part; 171. Center strip-shaped protrusion; 1711. Inner straight positioning surface of center strip-shaped protrusion; 1712. Outer straight positioning surface of center strip-shaped protrusion; 172. Middle strip-shaped recess; 18. Bottom positioning part; 181. Positioning protrusion; 1811. Bottom outer straight positioning surface; 1812. Bottom inner straight positioning surface; 2. Clamping component ; 21. Clamping groove; 22. Handle; 23. Bottom clamping surface; 24. Side clamping surface; 25. External mounting hole; 251. Machining center line; 26. Peripheral side clamping part; 261. Peripheral strip-shaped recess; 2611. Peripheral strip-shaped recessed inner straight positioning surface; 2612. Peripheral strip-shaped recessed outer straight positioning surface; 262. Clamping center line; 263. Side strip-shaped protrusion; 27. Central side clamping part; 271. Central strip-shaped recess; 2711. Central strip-shaped recessed inner straight positioning surface; 2712. Central strip-shaped recessed outer straight positioning surface; 272. Middle strip-shaped protrusion; 28. Bottom clamping part; 281. Clamping recess; 2811. Bottom outer straight clamping surface; 2812. Bottom inner straight clamping surface; 3. Fastener; 4. Rotation center shaft. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Example 1: Figures 1 to 9 This invention illustrates a first embodiment of a drilling tool with multiple clamping units. The drilling tool of this embodiment includes a cutting component 1, a clamping component 2, and a fastener 3. The cutting component 1 has a bottom positioning surface 12 and at least two side positioning surfaces 14. The clamping component 2 has a clamping groove 21 at one end and a shank 22 at the other end. The bottom surface of the clamping groove 21 is a bottom clamping surface 23, and at least two side clamping surfaces 24 are provided. The cutting component 1 is clamped in the clamping groove 21 and fixed by the fastener 3. The bottom positioning surface 12 and the bottom clamping surface 23 are arranged opposite to each other, and the side positioning surfaces 14 and the side clamping surfaces 24 are arranged opposite to each other. The clamping surfaces 24 are arranged opposite to each other. At least one side positioning surface 14 is provided with a peripheral side positioning part 16 and a center positioning part 17 located at the periphery and center of the side positioning surface 14, respectively. The side clamping surface 24 corresponding to the side positioning surface 14 is provided with a peripheral side clamping part 26 and a center side clamping part 27 located at the periphery and center of the side clamping surface 24, respectively. The peripheral side positioning part 16 and the peripheral side clamping part 26, and the center positioning part 17 and the center side clamping part 27 are in concave-convex fit, which are used to determine the unique installation direction of the cutting component 1, realize the circumferential positioning of the cutting component 1, and transmit the cutting torque and cutting force between the cutting component 1 and the clamping component 2 during the cutting process.

[0040] This drilling tool, which has multiple clamping units, has a peripheral side positioning part 16 and a central positioning part 17 located at the periphery and center of the side positioning surface 14, respectively, on at least one side positioning surface 14. A peripheral side clamping part 26 and a central side clamping part 27 located at the periphery and center of the side clamping surface 24, respectively, are provided on the side clamping surface 24 corresponding to the side positioning surface 14. The peripheral side positioning part 16 and the peripheral side clamping part 26, and the central positioning part 17 and the central side clamping part 27, are in concave-convex fit, forming a peripheral and central concave-convex fit structure, thereby forming multiple clamping units at the periphery and center. The concave-convex fit and peripheral concave-convex fit structure determine the unique installation direction of the cutting component 1 and achieve circumferential clamping and positioning of the cutting component 1. This transmits the cutting torque and cutting force between the cutting component 1 and the clamping component 2 during the cutting process. It also achieves geometric forced positioning and circumferential locking between the cutting component 1 and the clamping component 2. Combined with the fasteners 3 mounted on the side, it effectively restricts the radial and axial degrees of freedom of the cutting component 1, eliminates the micro-motion errors that may be caused by planar positioning in the prior art, improves the repeatability of tool positioning, and ensures the consistency of batch-processed holes. The peripheral and central concave-convex fit structure transmits the torque and cutting force generated during the cutting process directly through the convex-concave contact surface, rather than simply relying on the friction of the fasteners. This "shape-locking" connection method greatly improves the overall rigidity of the drilling tool and effectively balances positioning accuracy, structural rigidity, and assembly certainty.

[0041] Furthermore, such as Figure 1 As shown, in this embodiment, the angle between the insertion direction of the cutting component 1 and the clamping groove 21 and the rotation center axis 4 of the clamping component 2 is θ, satisfying: 0°≤θ≤25°. To maximize assembly efficiency, it is preferable that θ=0°, that is, the cutting component 1 is inserted into the clamping groove 21 in a manner parallel to the rotation center axis 4 of the clamping component 2.

[0042] Furthermore, in this embodiment, the peripheral positioning part 16 includes a plurality of mutually parallel peripheral strip-shaped protrusions 161, the central positioning part 17 includes a plurality of mutually parallel central strip-shaped protrusions 171, the peripheral clamping part 26 includes a plurality of mutually parallel peripheral strip-shaped recesses 261, and the central clamping part 27 includes a plurality of mutually parallel central strip-shaped recesses 271. Each peripheral strip-shaped protrusion 161 and each peripheral strip-shaped recess 261 corresponds to and engages with the other peripheral strip-shaped recess 261. Each central strip-shaped protrusion 171 and each central strip-shaped recess 271 corresponds to and engages with the other central strip-shaped recess 271. By providing a plurality of peripheral strip-shaped protrusions 161 and a plurality of peripheral strip-shaped recesses 261, as well as a plurality of central strip-shaped protrusions 171 and a plurality of central strip-shaped recesses 271, the cutting load can be evenly distributed to multiple contact points, avoiding premature local wear or cracking caused by stress concentration.

[0043] Furthermore, such as Figure 6 and Figure 7As shown, in this embodiment, the two sides of the peripheral strip-shaped protrusion 161 form an included angle α, and the two sides of the central strip-shaped protrusion 171 form an included angle β, satisfying: α ≠ β. Specifically, the two side surfaces of the peripheral strip-shaped protrusion 161 are respectively set as the inner straight positioning surface 1611 and the outer straight positioning surface 1612 of the peripheral strip-shaped protrusion, forming an included angle α between them. The two side surfaces of the central strip-shaped protrusion 171 are respectively set as the inner straight positioning surface 1711 and the outer straight positioning surface 1712 of the central strip-shaped protrusion, forming an included angle β between them.

[0044] Furthermore, in this embodiment, 5°≤α-β≤20°. The peripheral strip-shaped protrusions 161 employ a large included angle to enhance structural strength, efficiently distribute cutting forces and torque, while ensuring positioning strength and rigidity, and improving vibration and impact resistance; the central strip-shaped protrusion 171 employs a small included angle to improve centering effect, ensure center positioning accuracy, and thus improve dimensional accuracy at the borehole entry point. This synergistic effect of center and periphery partitioning ensures assembly feasibility while effectively suppressing vibration and chatter during high-speed cutting, significantly improving the surface quality of the machined material and extending tool life.

[0045] Furthermore, in this embodiment, the two sides of the peripheral strip-shaped recess 261 form an included angle α', and the two sides of the central strip-shaped recess 271 form an included angle β', satisfying: 5°≤α'-β'≤20°.

[0046] Specifically, the two side surfaces of the peripheral strip-shaped recess 261 are respectively designated as the inner straight positioning surface 2611 and the outer straight positioning surface 2612 of the peripheral strip-shaped recess, with an included angle α' between them. Similarly, the two side surfaces of the central strip-shaped recess 271 are respectively designated as the inner straight positioning surface 2711 and the outer straight positioning surface 2712 of the central strip-shaped recess, with an included angle β' between them. The following conditions should be met: 5°≤α'-β'≤20°. Preferably, α=α'=60° and β=β'=45°.

[0047] Furthermore, such as Figure 6 and Figure 7 As shown, in this embodiment, the gap between the peripheral strip protrusion 161 and the peripheral strip recess 261 on one opposite side is λ1, and the gap between the central strip protrusion 171 and the central strip recess 271 on one opposite side is λ2, satisfying: 0≤λ1≤0.3mm, 0≤λ2≤0.3mm.

[0048] Furthermore, such as Figure 5 As shown, in this embodiment, the gap between the peripheral strip protrusion 161 and the peripheral strip recess 261 on the other opposite side is λ3, and the gap between the central strip protrusion 171 and the central strip recess 271 on the other opposite side is λ4, satisfying: λ3=λ4=0.

[0049] Specifically, when the cutting component 1 is installed on the clamping component 2, the gap between the peripheral strip-shaped protruding outer straight positioning surface 1612 and the peripheral strip-shaped recessed outer straight positioning surface 2612 is λ3, and the gap between the central strip-shaped protruding outer straight positioning surface 1712 and the central strip-shaped recessed outer straight positioning surface 2712 is λ4. The gap should satisfy: λ3=λ4=0, to establish a radial positioning reference and reduce radial runout. The gap between the peripheral strip-shaped protruding inner straight positioning surface 1611 and the peripheral strip-shaped recessed inner straight positioning surface 2611 is λ1, and the gap between the central strip-shaped protruding inner straight positioning surface 1711 and the central strip-shaped recessed inner straight positioning surface 2711 is λ2. To reduce manufacturing difficulty, the gap should satisfy: 0≤λ1, λ2≤0.3mm, preferably λ1=λ2=0.1mm.

[0050] Furthermore, in this embodiment, a bottom positioning part 18 is provided on the bottom positioning surface 12, and a bottom clamping part 28 is provided on the bottom clamping surface 23. The bottom positioning part 18 and the bottom clamping part 28 are in concave-convex cooperation to transmit the torque and cutting force between the cutting part 1 and the clamping part 2 during the cutting process.

[0051] Furthermore, in this embodiment, the bottom positioning part 18 includes a plurality of positioning protrusions 181, and the bottom clamping part 28 includes a plurality of clamping concave strips 281. Each positioning protrusion 181 and each clamping concave strip 281 are in one-to-one correspondence and fit together. The gap between one opposite side of the positioning protrusion 181 and the clamping concave strip 281 is λ5, and the gap between the other opposite side is λ6, satisfying: λ5=λ6=0.

[0052] Specifically, the two sides of the positioning protrusion 181 are respectively set as the bottom outer straight positioning surface 1811 and the bottom inner straight positioning surface 1812, and the two sides of the clamping concave strip 281 are respectively set as the bottom outer straight clamping surface 2811 and the bottom inner straight clamping surface 2812. When the cutting component 1 is installed on the clamping component 2, the gap between the bottom outer straight positioning surface 1811 and the corresponding bottom outer straight clamping surface 2811 is λ5, and the gap between the bottom inner straight positioning surface 1812 and the corresponding bottom inner straight clamping surface 2812 is λ6. It should satisfy: λ5=λ6=0, and the two sides are in a zero gap state, which maximizes the rigidity of the axial positioning of the bottom positioning part 18 and the bottom clamping part 28.

[0053] Furthermore, in this embodiment, the number of positioning protrusions 181 is N3, and the number of clamping concave strips 281 is M3, satisfying: 2≤N3≤8, 2≤M3≤8, thus achieving a balance between multi-point support stability and manufacturing convenience. Preferably, N3=M3=6.

[0054] Furthermore, in this embodiment, the peripheral strip-shaped protrusions 161 on the side positioning surface 14 are symmetrical about the positioning center line 162 of the side positioning surface 14, and the peripheral strip-shaped recesses 261 on the side clamping surface 24 are symmetrical about the clamping center line 262 of the side clamping surface 24.

[0055] Furthermore, such as Figure 8 and Figure 9 As shown, in this embodiment, when the cutting component 1 is separated from the clamping component 2, the angle between the clamping center line 262 and the rotation center axis 4 of the clamping component 2 is γ2. When the cutting component 1 and the clamping component 2 are assembled in place, the angle between the positioning center line 162 and the rotation center axis 4 of the clamping component 2 is γ1, satisfying: 30'≤γ2-γ1≤2°. When the cutting component 1 is not installed on the clamping component 2, the angle between the clamping center line 262 and the rotation center axis 4 is γ2. When the cutting component 1 is installed on the clamping component 2, the angle between the clamping center line 262 and the rotation center axis 4 is γ1. To achieve reliable elastic locking, the following condition should be met: 30'≤γ2-γ1≤2°. Preferably, γ2=1°, γ1=0°, that is, after tightening the fastener 3, radial clamping force is generated by the angle change of the peripheral strip-shaped protrusion 161 and the peripheral strip-shaped recess 261, automatically eliminating the fitting gap and achieving self-locking.

[0056] Furthermore, in this embodiment, there are two side positioning surfaces 14, which are located on opposite sides of the cutting component 1, and two side clamping surfaces 24, which are located on opposite sides of the clamping groove 21.

[0057] Furthermore, in this embodiment, each side positioning surface 14 is provided with a peripheral side positioning part 16 and a center positioning part 17; each side clamping surface 24 is provided with a peripheral side clamping part 26 and a center side clamping part 27.

[0058] Furthermore, in this embodiment, the two side positioning surfaces 14 and the two side clamping surfaces 24 are symmetrically arranged relative to the rotation center axis 4 of the clamping component 2; the peripheral side positioning part 16, the center positioning part 17, the peripheral side clamping part 26, and the center side clamping part 27 are all symmetrically distributed relative to the rotation center axis 4 of the clamping component 2. The cutting component 1 is provided with two identical side positioning surfaces 14, which are symmetrically arranged relative to the rotation center axis 4 of the drilling tool. The clamping groove part 21 is provided with two identical side clamping surfaces 24, which are symmetrically arranged relative to the rotation center axis 4 of the drilling tool. Each side positioning surface 14 is provided with a center positioning part 17 and a peripheral side positioning part 16, and the center positioning part 17 and the peripheral side positioning part 16 are symmetrically distributed relative to the rotation center axis 4. Each side clamping surface 24 is provided with a center side clamping part 27 and a peripheral side clamping part 26, and the center side clamping part 27 and the peripheral side clamping part 26 are symmetrically distributed relative to the rotation center axis 4. When the cutting component 1 is installed, the clamping component 2, through the action of the fastener 3, elastically presses the cutting component 1 between two identical side clamping surfaces 24, forming a stable double-sided clamping structure.

[0059] Furthermore, in this embodiment, the cutting component 1 has an inner mounting hole 15 that extends through to the side positioning surface 14, the clamping groove 21 has an outer mounting hole 25 that extends through to the side clamping surface 24, and the fastener 3 passes through the inner mounting hole 15 and the outer mounting hole 25.

[0060] Furthermore, such as Figure 4 As shown, in this embodiment, the inner mounting hole 15 has a hole center line 151, and the outer mounting hole 25 has a machining center line 251. The machining center line 251 forms an eccentric distance τ relative to the hole center line 151 towards the shank 22, satisfying: 0.05mm ≤ τ ≤ 0.3mm. The inner mounting hole 15 is symmetrical about the hole center line 151, and the fastener 3 in the outer mounting hole 25 is symmetrical about the machining center line 251. When the cutting component 1 is installed on the clamping component 2, the machining center line 251 forms an eccentric distance τ relative to the hole center line 151 towards the shank 22. This eccentric distance τ utilizes the inclined surface of the fastener 3, i.e., the screw head, to convert the rotational torque into a huge radial clamping force, ensuring that the tool remains securely fastened and reliable under the high-frequency vibration environment generated by high-speed cutting, avoiding loosening and failure. It should satisfy: 0.05mm ≤ τ ≤ 0.3mm. Preferably, τ = 0.1mm.

[0061] Furthermore, in this embodiment, the cutting component 1 has an end cutting area 11 at one end relative to the bottom positioning surface 12 and a side cutting area 13 on the side adjacent to the side positioning surface 14. Preferably, the front and rear sides of the clamping groove 21 extend through to both sides of the clamping component 2 in the length direction, the end cutting area 11 is located on the outer side of the clamping groove 21 in the depth direction, and the side cutting area 13 is located on the outer side of the clamping groove 21 in the length direction.

[0062] Example 2: Figure 10 This paper illustrates a second embodiment of the drilling tool with multiple clamping units according to the present invention. The technical solution of this embodiment is basically the same as that of the first embodiment, with the main difference being: In this embodiment, the included angle between the two sides of the central positioning part 17 on one side positioning surface 14 is set as α1, and the included angle between the two sides of the peripheral side positioning part 16 is set as β1; on the other side positioning surface 14, the included angle between the two sides of the central positioning part 17 is set as α2, and the included angle between the two sides of the peripheral side positioning part 16 is set as β2, satisfying: 5°≤α1-β1≤20° and α1≠α2. In this embodiment, preferably α2=60°, α1=55°, and β1=40°. The asymmetrical design of the central positioning part 17 on the two side positioning surfaces 14 allows the tool to be assembled in only one direction, which greatly reduces the manufacturing difficulty of the tool and improves the assembly accuracy of the tool.

[0063] Example 3: Figure 11This invention illustrates a third embodiment of a drilling tool with multiple clamping units. The technical solution of this embodiment is basically the same as that of the first embodiment, with the main difference being: the peripheral positioning part 16 includes multiple parallel side strip-shaped recesses 163, the central positioning part 17 includes multiple parallel middle strip-shaped recesses 172, the peripheral clamping part 26 includes multiple parallel side strip-shaped protrusions 263, and the central clamping part 27 includes multiple parallel middle strip-shaped protrusions 272. Each side strip-shaped recess 163 and each side strip-shaped protrusion 263 are in a one-to-one correspondence and convex-concave fit, and each middle strip-shaped recess 172 and each middle strip-shaped protrusion 272 are in a one-to-one correspondence and convex-concave fit. The side strip-shaped recess 163 and the side strip-shaped protrusion 263 form a peripheral concave-convex fit, and the middle strip-shaped recess 172 and the middle strip-shaped protrusion 272 form a central concave-convex fit. The installation direction of the cutting component 1 is determined by the central concave-convex fit and the peripheral concave-convex fit, and the circumferential clamping and positioning of the cutting component 1 is realized. This allows the cutting torque and cutting force between the cutting component 1 and the clamping component 2 to be transmitted during the cutting process. This reverse design provides more options for the manufacturing process.

[0064] In summary, the embodiments of the present invention construct a "form-lock" connection by setting a peripheral and central double concave-convex fit structure on the side positioning surface 14 and the side clamping surface 24 of the cutting component 1 and the clamping component 2. This achieves circumferential forced positioning in a single direction and direct transmission of cutting load, significantly improving the repeatability of the drilling tool, system rigidity, and vibration resistance. Simultaneously, through optimization measures such as the bottom concave-convex fit, the design of the eccentric fastener 3, and the elastic self-locking angle, the stability and reliability of the connection are further enhanced, giving it significant advantages in high-precision, high-efficiency batch drilling operations.

[0065] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A drilling tool having multiple clamping units, comprising a cutting component (1), a clamping component (2), and a fastener (3), wherein the cutting component (1) has a bottom positioning surface (12) and at least two side positioning surfaces (14) respectively, one end of the clamping component (2) has a clamping groove (21) and the other end has a shank (22), the bottom surface of the clamping groove (21) is a bottom clamping surface (23), and at least two side clamping surfaces (24) are respectively provided on both sides, the cutting component (1) is clamped in the clamping groove (21) and fixed by the fastener (3), the bottom positioning surface (12) and the bottom clamping surface (23) are arranged opposite to each other, and the side positioning surface (14) and the side clamping surface (24) are arranged opposite to each other, characterized in that: At least one of the side positioning surfaces (14) is provided with a peripheral side positioning part (16) and a center positioning part (17) located at the periphery and center of the side positioning surface (14), respectively. The side clamping surface (24) corresponding to the side positioning surface (14) is provided with a peripheral side clamping part (26) and a center side clamping part (27) located at the periphery and center of the side clamping surface (24), respectively. The peripheral side positioning part (16) and the peripheral side clamping part (26), and the center positioning part (17) and the center side clamping part (27) are all in concave-convex fit, used to determine the unique installation direction of the cutting component (1), realize the circumferential positioning of the cutting component (1), and transmit the cutting torque and cutting force between the cutting component (1) and the clamping component (2) during the cutting process; the peripheral side positioning part (16) includes multiple parallel peripheral strip protrusions (161), the central positioning part (17) includes multiple parallel central strip protrusions (171), the peripheral side clamping part (26) includes multiple parallel peripheral strip recesses (261), the central side clamping part (27) includes multiple parallel central strip recesses (271), each peripheral strip protrusion (161) and each peripheral strip recess (261) are in a one-to-one concave-convex fit, each central strip protrusion (171) and each central strip recess (271) are in a one-to-one concave-convex fit; the two sides of the peripheral strip protrusions (161) form an included angle α, the two sides of the central strip protrusions (171) form an included angle β, satisfying: 5°≤α-β≤20°.

2. The drilling tool with multiple clamping units according to claim 1, characterized in that: The angle between the insertion direction of the cutting component (1) and the clamping groove (21) and the rotation center axis (4) of the clamping component (2) is θ, which satisfies: 0°≤θ≤25°.

3. The drilling tool with multiple clamping units according to claim 1, characterized in that: The two sides of the peripheral strip-shaped recess (261) form an included angle α', and the two sides of the central strip-shaped recess (271) form an included angle β', satisfying: 5°≤α'-β'≤20°.

4. The drilling tool with multiple clamping units according to claim 1, characterized in that: The gap between the peripheral strip protrusion (161) and the peripheral strip recess (261) on one opposite side is λ1, and the gap between the central strip protrusion (171) and the central strip recess (271) on one opposite side is λ2, satisfying: 0≤λ1≤0.3mm, 0≤λ2≤0.3mm.

5. The drilling tool with multiple clamping units according to claim 4, characterized in that: The gap between the peripheral strip protrusion (161) and the peripheral strip recess (261) on the other side is λ3, and the gap between the central strip protrusion (171) and the central strip recess (271) on the other side is λ4, satisfying: λ3=λ4=0.

6. The drilling tool having multiple clamping units according to claim 1, characterized in that: The bottom positioning surface (12) is provided with a bottom positioning part (18), and the bottom clamping surface (23) is provided with a bottom clamping part (28). The bottom positioning part (18) and the bottom clamping part (28) are in concave-convex cooperation to transmit the torque and cutting force between the cutting part (1) and the clamping part (2) during the cutting process.

7. The drilling tool having multiple clamping units according to claim 6, characterized in that: The bottom positioning part (18) includes a plurality of positioning protrusions (181), and the bottom clamping part (28) includes a plurality of clamping concave strips (281). Each positioning protrusion (181) and each clamping concave strip (281) are in one-to-one correspondence and fit together. The gap between one opposite side of the positioning protrusion (181) and the clamping concave strip (281) is λ5 and the gap between the other opposite side is λ6, satisfying: λ5=λ6=0.

8. The drilling tool having multiple clamping units according to claim 7, characterized in that: The number of positioning protrusions (181) is N3, and the number of clamping concave strips (281) is M3, satisfying: 2≤N3≤8, 2≤M3≤8.

9. The drilling tool having multiple clamping units according to claim 1, characterized in that: The peripheral strip protrusion (161) on the side positioning surface (14) is symmetrical about the positioning center line (162) of the side positioning surface (14), and the peripheral strip recess (261) on the side clamping surface (24) is symmetrical about the clamping center line (262) of the side clamping surface (24); when the cutting component (1) is separated from the clamping component (2), the angle between the clamping center line (262) and the rotation center axis (4) of the clamping component (2) is γ2; when the cutting component (1) and the clamping component (2) are assembled in place, the angle between the clamping center line (262) and the rotation center axis (4) of the clamping component (2) is γ1, satisfying: 30'≤γ2-γ1≤2°.

10. The drilling tool having multiple clamping units according to claim 1, characterized in that: Two side positioning surfaces (14) are provided, located on opposite sides of the cutting component (1), and two side clamping surfaces (24) are provided, located on opposite sides of the clamping groove (21); each side positioning surface (14) is provided with a peripheral side positioning part (16) and a central positioning part (17); each side clamping surface (24) is provided with a peripheral side clamping part (26) and a central side clamping part (27).

11. The drilling tool having multiple clamping units according to claim 10, characterized in that: The two side positioning surfaces (14) and the two side clamping surfaces (24) are symmetrically arranged relative to the rotation center axis (4) of the clamping component (2); the peripheral side positioning part (16), the center positioning part (17), the peripheral side clamping part (26) and the center side clamping part (27) are symmetrically distributed relative to the rotation center axis (4) of the clamping component (2).

12. A drilling tool having a plurality of clamping units according to any one of claims 1 to 11, characterized in that: The cutting component (1) has an inner mounting hole (15) that extends through to the side positioning surface (14). The clamping groove (21) has an outer mounting hole (25) that extends through to the side clamping surface (24). The fastener (3) passes through the inner mounting hole (15) and the outer mounting hole (25). The inner mounting hole (15) has a hole center line (151), and the outer mounting hole (25) has a machining center line (251). The machining center line (251) forms an eccentric distance τ relative to the hole center line (151) towards the shank (22), satisfying: 0.05mm≤τ≤0.3mm.

13. The drilling tool having a plurality of clamping units according to any one of claims 1 to 11, characterized in that: The cutting component (1) has an end cutting area (11) at one end relative to the bottom positioning surface (12) and a side cutting area (13) on the side adjacent to the side positioning surface (14).

14. A drilling tool having a plurality of clamping units according to any one of claims 1 to 11, characterized in that: The peripheral positioning part (16) includes a plurality of parallel side strip-shaped recesses (163), the central positioning part (17) includes a plurality of parallel middle strip-shaped recesses (172), the peripheral clamping part (26) includes a plurality of parallel side strip-shaped protrusions (263), and the central clamping part (27) includes a plurality of parallel middle strip-shaped protrusions (272). Each side strip-shaped recess (163) and each side strip-shaped protrusion (263) are in a one-to-one correspondence and fit together. Each middle strip-shaped recess (172) and each middle strip-shaped protrusion (272) are in a one-to-one correspondence and fit together.

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