A drill tool having a concave-convex fitting on the side surface

Abstract

The application discloses a drilling tool with concave-convex matching on the side, which comprises a cutting part and a clamping part. The cutting part comprises an end cutting area, a bottom locating surface and a cutting side surface between the end cutting area and the bottom locating surface. The cutting side surface is provided with a plurality of side cutting areas and a plurality of side locating surfaces. The end cutting area and the side cutting area form a cutting area of the cutting part. The side locating surface is provided with an inner mounting hole. The clamping part comprises a clamping groove part and a handle part. The clamping groove part is provided with a bottom clamping surface and a side clamping surface corresponding to the bottom locating surface and the side locating surface respectively. At least one side locating surface is provided with a side locating convex part. The side clamping surface corresponding to the side locating surface is provided with a side clamping concave part. The side locating convex part and the side clamping concave part form a concave-convex matching to determine the mounting direction of the cutting part and realize the circumferential clamping and positioning of the cutting part, so as to transmit the cutting torque and the cutting force between the cutting part and the clamping part in the cutting process. The cutting tool has high rigidity, excellent anti-vibration performance, high positioning accuracy and long service life.

Description

Technical Field

[0001] This invention relates primarily to metal cutting tools, and more particularly to a drilling tool with a concave-convex fit on its side. Background Technology

[0002] In the field of metal cutting, to balance cutting performance and manufacturing costs, drilling tools generally adopt a split-type structure design, which is composed of a high-hardness, high-wear-resistant cutting component (such as a carbide insert) and a highly flexible clamping component (such as an alloy steel tool body). This design allows only the cutting component, i.e., the tool tip, to be replaced after the cutting component wears out, thus significantly reducing machining costs.

[0003] In existing technologies, cutting components are typically assembled onto clamping components using planar positioning and screw fastening. Since the contact surfaces are simply flat and lack an effective mechanical interlocking structure, problems such as positioning accuracy being easily affected by bolt preload fluctuations, poor vibration resistance, and a single cutting force transmission path occur during the cutting process. Especially under heavy-load or intermittent cutting conditions, cutting components are prone to fretting wear, circumferential slippage, and even chipping, which seriously affect machining accuracy and tool life.

[0004] To address the aforementioned issues, Chinese patent document CN104185526B discloses a drilling tool that uses a bolt step and the undercut groove of the cutting insert to form an axial interlock. While this prevents the cutting insert from falling off under axial tension, the solution relies solely on a single axial mechanical barrier to resist cutting forces. When faced with complex radial forces and impact loads generated by heavy cutting, the cutting insert will still experience fretting wear in the circumferential direction. Furthermore, the internal cavity designed to achieve the undercut structure weakens the strength of the cutting insert body, and the narrow fit clearance easily accumulates chips, increasing the difficulty of disassembly. In addition, this solution requires extremely high machining accuracy for the undercut shape and the bolt step, resulting in a significant increase in manufacturing costs.

[0005] Chinese patent document CN108687385B proposes a modular drill bit that achieves radial locking of the cutting tool by driving a wedge block with a lateral screw. Although this solves the space limitation problem of the traditional top clamping method, the solution relies on a multi-stage transmission chain of "screw-wedge block-cutting tool" for locking. The cumulative tolerance between the mating surfaces can cause the wedge block to loosen slightly under heavy load vibration, reducing the clamping rigidity. At the same time, the receiving cavity and sliding track on the side of the tool body weaken the structural strength of the key stress parts and limit the bending resistance of the tool in deep hole machining. In addition, the side opening is prone to becoming a dead angle for chip accumulation, affecting the smoothness of chip removal and accelerating internal wear.

[0006] In summary, existing split-type drilling tools struggle to achieve an effective balance between positioning reliability, structural strength, and vibration resistance. In particular, they lack a multi-directional mechanical interlocking structure capable of simultaneously resisting complex axial, radial, and circumferential loads, which has become a technical challenge that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0007] 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 a concave-convex fit on the side, which has high rigidity, excellent vibration resistance, high positioning accuracy and long service life.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A drilling tool with a concave-convex fit on its side includes a cutting component, a clamping component, and a fastener. 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 areas form the cutting area of ​​the cutting component. An inner mounting hole is formed 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. An outer mounting hole is formed on the side clamping surface. The fastener can pass through the outer mounting hole and the inner mounting hole to install the cutting component onto the clamping component. At least one side positioning surface has a side positioning protrusion, and a side clamping recess is formed on the side clamping surface corresponding to the side positioning surface. 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.

[0009] As a further improvement to the above technical solution: The bottom positioning surface is provided with a bottom positioning protrusion, and the bottom clamping surface is provided with a bottom clamping recess, and the bottom positioning protrusion and the bottom clamping recess form a concave-convex fit.

[0010] The side positioning protrusion includes multiple parallel strip-shaped protrusions, and the side clamping recess includes multiple parallel strip-shaped recesses corresponding to the strip-shaped protrusions. The angle between the straight insertion of the cutting component in the mounting direction of the clamping component and the rotation center axis of the drilling tool is α, which should satisfy: 0°≤α≤25°.

[0011] The number of strip-shaped protrusions is N1, and the number of strip-shaped indentations is N2, which should satisfy: 2≤N1, N2≤10.

[0012] Each of the strip-shaped protrusions is symmetrical about its positioning center line, and each of the strip-shaped recesses is symmetrical about its clamping center line. When the cutting component is not installed on the clamping component, the angle between the clamping center line and the rotation center axis is γ2. When the cutting component is installed on the clamping component, the angle between the clamping center line and the rotation center axis is γ1. The following condition should be met: 30'≤γ2-γ1≤2°.

[0013] The two sides of the strip-shaped protrusion are the outer straight positioning surface and the inner straight positioning surface, respectively. The two sides of the strip-shaped concave part are the outer straight clamping surface and the inner straight clamping surface, respectively. When the cutting part is installed on the clamping part, the gap between the outer straight positioning surface and the corresponding outer straight clamping surface is λ1, which should satisfy: λ1=0.

[0014] The gap between the inner straight positioning surface and the corresponding inner straight clamping surface is λ2, which should satisfy: 0≤λ2≤0.3mm.

[0015] The included angle between the outer straight positioning surface and the inner straight positioning surface is β1, which should satisfy: 25°≤β1≤65°.

[0016] The bottom positioning protrusion includes multiple positioning protrusions, the two sides of which are bottom outer straight positioning surfaces and bottom inner straight positioning surfaces. The bottom clamping recess includes multiple clamping recesses, the two sides of which are bottom outer straight clamping surfaces and bottom inner straight clamping surfaces. When the cutting component is installed in place on the clamping component, the gap between the bottom outer straight positioning surface and the corresponding bottom outer straight clamping surface is λ3, and the gap between the bottom inner straight positioning surface and the corresponding bottom inner straight clamping surface is λ4, which should satisfy: λ3=λ4=0.

[0017] The included angle between the outer bottom straight positioning surface and the inner bottom straight positioning surface is β2, which should satisfy: 25°≤β2≤65°.

[0018] The number of positioning protrusions is M1, and the number of clamping concave strips is M2, which should satisfy: 2≤M1, M2≤8.

[0019] The cutting side has two identical side positioning surfaces, which are symmetrically arranged with respect to the rotation center axis of the drilling tool. The clamping groove has two identical side clamping surfaces, which are symmetrically arranged with respect to the rotation center axis of the drilling tool.

[0020] The side positioning protrusion includes multiple strip-shaped protrusions arranged on a concentric circumference, with a minimum circumferential radius of R. The cutting diameter of the cutting component is D, which should satisfy: 30mm≤R≤10D.

[0021] The inner mounting hole is symmetrical about the hole centerline, and the fastener in the outer mounting hole is symmetrical about its fastening centerline. When the cutting component is installed in place on the clamping component, the fastening centerline relative to the hole centerline forms an eccentric distance τ in the direction of the shank, which should satisfy: 0.05mm≤τ≤0.3mm.

[0022] A drilling tool with a concave-convex fit on its side includes a cutting component, a clamping component, and a fastener. 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 areas form the cutting area of ​​the cutting component. An inner mounting hole is formed 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. An outer mounting hole is formed on the side clamping surface. The fastener can pass through the outer mounting hole and the inner mounting hole to install the cutting component onto the clamping component. At least one side positioning surface has a side positioning recess, and a side clamping surface corresponding to the side positioning surface has a side clamping protrusion. The side positioning recess and the side clamping protrusion 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.

[0023] Compared with the prior art, the advantages of the present invention are as follows: The present invention provides a drilling tool with a concave-convex fit on its side. At least one side positioning surface has a side positioning protrusion, and a 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 achieve 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 concave-convex fit between the side positioning protrusion and the side clamping recess achieves geometrically forced positioning between the cutting component and the clamping component. Combined with the side-mounted fasteners, this effectively restricts the radial and axial degrees of freedom of the cutting component, eliminating the limitations of existing... The micro-motion error that may be generated by planar positioning in the technology improves the repeatability of tool positioning and ensures the consistency of batch-processed holes. The concave-convex mating structure directly transmits the huge torque and radial cutting force generated during the cutting process through the convex-concave contact surface, rather than simply relying on the friction of fasteners. This "shape-lock" connection method greatly improves the overall rigidity of drilling tools. The small gap reserved between the side positioning convex part and the side clamping concave part can ensure the feasibility of assembly and form a tight fit after being subjected to force, effectively suppressing vibration during high-speed cutting, reducing chatter, thereby improving the surface quality of the machined part and extending the tool life. Attached Figure Description

[0024] Figure 1 This is a perspective structural diagram of the first embodiment of the drilling tool with concave-convex mating on the side of the present invention; Figure 2 This is an exploded perspective view of the first embodiment of the drilling tool with concave-convex fitting on the side of the present invention. Figure 3 This is a top view of the first embodiment of the drilling tool with a concave-convex fit on the side of the present invention; Figure 4 yes Figure 3 AA view; Figure 5 yes Figure 3 Enlarged view at point B in the middle; Figure 6 yes Figure 4 Enlarged view at point C; Figure 7 This is a left view of the first embodiment of the drilling tool with a concave-convex fit on the side of the present invention; Figure 8 This is a left view of the clamping component of the first embodiment of the drilling tool with a concave-convex fit on the side of the present invention; Figure 9 This is an exploded perspective view of a second embodiment of the drilling tool with a concave-convex fit on the side of the present invention. Figure 10 This is an exploded perspective view of a third embodiment of the drilling tool with a concave-convex fit on the side of the present invention; Figure 11 This is a front view of the cutting component of a third embodiment of a drilling tool with a concave-convex fit on its side, according to the present invention; Figure 12 This is an exploded perspective view of a third embodiment of the drilling tool with a concave-convex fit on the side of the present invention; Figure 13 This is a front view of the cutting component of a third embodiment of a drilling tool with a concave-convex fit on its side, according to the present invention.

[0025] 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. Side positioning protrusion; 161. Strip-shaped protrusion; 1611. Outer straight positioning surface; 1612. Inner straight positioning surface; 162. Positioning center line; 16'. Side positioning recess; 17. Bottom positioning protrusion; 171. Positioning protrusion; 1711. Bottom outer straight positioning surface; 1712. Bottom inner straight positioning surface; 2. Clamping part Components; 21. Clamping groove; 22. Handle; 23. Bottom clamping surface; 24. Side clamping surface; 25. External mounting hole; 26. Side clamping recess; 261. Strip-shaped recess; 2611. Outer straight clamping surface; 2612. Inner straight clamping surface; 262. Clamping center line; 26'. Side clamping protrusion; 27. Bottom clamping recess; 271. Clamping recess; 2711. Bottom outer straight clamping surface; 2712. Bottom inner straight clamping surface; 3. Fastener; 31. Fastening center line; 9. Rotation center shaft. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc., which indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended 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 this invention.

[0028] Figures 1 to 8This invention illustrates a first embodiment of a drilling tool with a concave-convex mating side surface. The drilling tool includes a cutting component 1, a clamping component 2, and a fastener 3. The cutting component 1 includes an end cutting region 11, a bottom positioning surface 12, and a cutting side surface located between the end cutting region 11 and the bottom positioning surface 12. The cutting side surface has multiple side cutting regions 13 and multiple side positioning surfaces 14. The end cutting region 11 and the side cutting regions 13 form the cutting area of ​​the cutting component. The side positioning surfaces 14 have internal mounting holes 15. The clamping component 2 includes a clamping... The clamping groove 21 and the handle 22 are respectively provided with a bottom clamping surface 23 and a side clamping surface 24 corresponding to the bottom positioning surface 12 and the side positioning surface 14. The side clamping surface 24 has an outer mounting hole 25. The fastener 3 can pass through the outer mounting hole 25 and the inner mounting hole 15 to install the cutting part 1 onto the clamping part 2. The two side positioning surfaces 14 are provided with side positioning protrusions 16. The side clamping surface 24 corresponding to the side positioning surface 14 is provided with a side clamping recess 26. The side positioning protrusions 16 and the side clamping recesses 26 form a concave-convex fit to determine the cutting part. The mounting direction of component 1 enables circumferential clamping and positioning of the cutting component 1, thereby transmitting the cutting torque and cutting force between the cutting component 1 and the clamping component 2 during the cutting process. The side positioning protrusion 16 and the side clamping recess 26 form a concave-convex fit, realizing the geometric forced positioning between the cutting component 1 and the clamping component 2. Combined with the fastener 3 mounted on the side, the radial and axial degrees of freedom of the cutting component 1 are effectively restricted, eliminating the micro-motion error that may be caused by planar positioning in the prior art, improving the repeatability of tool positioning accuracy, and ensuring the consistency of batch-processed holes. The concave-convex fit structure transmits the huge torque and radial cutting force generated during the cutting process directly through the convex-concave contact surface, rather than simply relying on the friction of the fastener. This "shape-lock" connection method greatly improves the overall rigidity of the drilling tool. The small gap reserved between the side positioning protrusion 16 and the side clamping recess 26 can ensure the feasibility of assembly and form a tight fit after being subjected to force, effectively suppressing vibration during high-speed cutting, reducing chatter, thereby improving the surface quality of the machined part and extending the tool life.

[0029] In this embodiment, a bottom positioning protrusion 17 is provided on the bottom positioning surface 12, and a bottom clamping recess 27 is provided on the bottom clamping surface 23. The bottom positioning protrusion 17 and the bottom clamping recess 27 form a convex-concave fit. The convex-concave fit formed by the bottom positioning protrusion 17 and the bottom clamping recess 27 can effectively share the radial cutting force, prevent the drilling tool from shifting under heavy load, and further improve the positioning accuracy and the overall rigidity of the drilling tool.

[0030] In this embodiment, the side positioning protrusion 16 includes multiple parallel strip-shaped protrusions 161, and the side clamping recess 26 includes multiple parallel strip-shaped recesses 261 corresponding to the strip-shaped protrusions 161. By providing multiple strip-shaped protrusions 161 and multiple strip-shaped recesses 261, the cutting load is evenly distributed across multiple contact points, avoiding premature wear or breakage caused by stress concentration. The angle between the straight insertion of the cutting component 1 into the mounting direction of the clamping component 2 and the rotation center axis 9 of the drilling tool is α, which should satisfy: 0°≤α≤25°. The multiple strip-shaped protrusions 161 and multiple strip-shaped recesses 261 are arranged in parallel, facilitating processing while ensuring linear assembly. In this embodiment, to maximize assembly efficiency, α=0° is preferred, that is, the cutting component is inserted into the clamping component in a manner parallel to the axis.

[0031] There are N1 strip-shaped protrusions 161 and N2 strip-shaped recesses 261. To balance the stability of multi-point support with manufacturing convenience, the following conditions should be met: 2≤N1, N2≤10. In this embodiment, N1=N2=7.

[0032] Each strip-shaped protrusion 161 is symmetrical about its positioning center line 162, and each strip-shaped recess 261 is symmetrical about its clamping center line 262. When the cutting component 1 is not installed to the clamping component 2, the angle between the clamping center line 262 and the rotation center axis 9 is γ2 (e.g., Figure 8 When the cutting component 1 is installed in place on the clamping component 2, the angle between the clamping center line 262 and the rotation center axis 9 is γ1 (e.g., Figure 7 To achieve reliable elastic locking, the following condition must be met: 30'≤γ2-γ1≤2°. In this embodiment, γ2=1° and γ1=0°. That is, after tightening the fastener 3, the radial clamping force is generated by the angle change of the strip-shaped protrusion 161 and the strip-shaped recess 261, which automatically eliminates the mating gap and achieves self-locking.

[0033] In this embodiment, as Figure 5 The two sides of the strip-shaped protrusion 161 are the outer straight positioning surface 1611 and the inner straight positioning surface 1612, respectively. The two sides of the strip-shaped recess 261 are the outer straight clamping surface 2611 and the inner straight clamping surface 2612, respectively. When the cutting component 1 is installed on the clamping component 2, the gap between the outer straight positioning surface 1611 and the corresponding outer straight clamping surface 2611 is λ1, which should satisfy: λ1=0, in order to establish a radial positioning reference and reduce radial runout; the gap between the inner straight positioning surface 1612 and the corresponding inner straight clamping surface 2612 is λ2. In order to facilitate assembly and accommodate minor manufacturing tolerances, it should satisfy: 0≤λ2≤0.3mm. In this embodiment, λ2=0.1mm.

[0034] The included angle between the outer straight positioning surface 1611 and the inner straight positioning surface 1612 is β1. To ensure the strength of the strip protrusion 161 and facilitate manufacturing, it should satisfy: 25°≤β1≤65°. In this embodiment, β1=60°.

[0035] In this embodiment, as Figure 6 The bottom positioning protrusion 17 includes multiple positioning protrusions 171, and the two sides of the positioning protrusions 171 are the bottom outer straight positioning surface 1711 and the bottom inner straight positioning surface 1712. The bottom clamping recess 27 includes multiple clamping recesses 271, and the two sides of the clamping recesses 271 are the bottom outer straight clamping surface 2711 and the bottom inner straight clamping surface 2712. When the cutting component 1 is installed on the clamping component 2, the gap between the bottom outer straight positioning surface 1711 and the corresponding bottom outer straight clamping surface 2711 is λ3, and the gap between the bottom inner straight positioning surface 1712 and the corresponding bottom inner straight clamping surface 2712 is λ4. It should satisfy: λ3=λ4=0. The two sides of the positioning protrusions 171 and the two sides of the clamping recesses 271 are in a zero-gap state, which maximizes the rigidity of the bottom positioning protrusion 17 and the bottom clamping recess 27 in axial positioning.

[0036] The included angle between the outer bottom straight positioning surface 1711 and the inner bottom straight positioning surface 1712 is β2, which should satisfy: 25°≤β2≤65°. In this embodiment, β2=60°.

[0037] The number of positioning protrusions 171 is M1, and the number of clamping concave strips 271 is M2. In order to optimize the uniform support of the bottom surface and optimize the stress distribution, the following conditions should be met: 2≤M1, M2≤8. In this embodiment, M1=M2=6.

[0038] In this embodiment, two identical side positioning surfaces 14 are provided on the cutting side. The two side positioning surfaces 14 are symmetrically arranged with respect to the rotation center axis 9 of the drilling tool. The clamping groove 21 is provided with two identical side clamping surfaces 24. The two side clamping surfaces 24 are symmetrically arranged with respect to the rotation center axis 9 of the drilling tool. When the cutting component 1 is installed, the clamping component 2 uses the fastener 3 to elastically press the cutting component 1 between the two identical side clamping surfaces 24 to form a stable double-sided clamping structure.

[0039] In this embodiment, the inner mounting hole 15 is symmetrical about the hole centerline 151, and the fastener 3 in the outer mounting hole 25 is symmetrical about its fastening centerline 31. When the cutting component 1 is installed on the clamping component 2, the fastening centerline 31 forms an eccentric distance τ relative to the hole centerline 151 in the direction of the shank 22. This eccentric distance τ uses the inclined surface of the fastener 3, i.e., the screw head, to convert the rotational torque into a huge radial clamping force, so as to ensure that the tool remains secure and reliable under the high-frequency vibration environment generated by high-speed cutting, and avoid loosening and failure. It should meet the following condition: 0.05mm≤τ≤0.3mm. In this embodiment, τ=0.1mm.

[0040] Figure 9 This invention illustrates a second embodiment of a drilling tool with a concave-convex fit on its side. The technical solution of this embodiment is basically the same as that of the first embodiment, except that: in this embodiment, a side positioning recess 16' is provided on the side positioning surface 14, and a side clamping protrusion 26' is provided on the side clamping surface 24 corresponding to the side positioning surface 14. The side positioning recess 16' and the side clamping protrusion 26' form a concave-convex fit to determine the installation direction of the cutting component 1 and to achieve circumferential clamping and positioning of the cutting component 1, thereby transmitting the cutting torque and cutting force between the cutting component 1 and the clamping component 2 during the cutting process. The concave-convex structure on the bottom positioning surface 12 and the bottom clamping surface 23 is also the opposite of that in the first embodiment. This reverse design provides more options for the manufacturing process.

[0041] Figure 10 and Figure 11 The present invention illustrates a third embodiment of a drilling tool with a concave-convex mating side. The technical solution of this embodiment is basically the same as that of the first embodiment, with the main difference being the arrangement of the strip-shaped protrusions 161: In this embodiment, only one side positioning surface 14 is provided with a side positioning protrusion 16, which includes multiple strip-shaped protrusions 161. The multiple strip-shaped protrusions 161 are arranged on the same concentric circle, and the minimum circumferential radius is R. The cutting diameter of the cutting component 1 is D. To meet the requirements of structural strength and spatial layout, the following should be satisfied: 30mm≤R≤10D. Specifically, R=40mm and D=13mm.

[0042] Figure 12 and Figure 13 The present invention provides a fourth embodiment of a drilling tool with a concave-convex fit on the side. This embodiment is basically the same as the third embodiment, except that: in this embodiment, the two side positioning surfaces 14 are provided with side positioning protrusions 16, and the strip-shaped protrusions 161 on the two side positioning surfaces 14 are arranged on the same concentric circle, wherein the minimum circumferential radius is R, R=32mm, and the cutting part diameter D=13mm.

[0043] 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 with a concave-convex fit on its side, comprising a cutting component (1), a clamping component (2), and a fastener (3), wherein the cutting component (1) comprises an end cutting area (11), a bottom positioning surface (12), and a cutting side surface located between the end cutting area (11) and the bottom positioning surface (12), wherein the cutting side surface is provided with a plurality of side cutting areas (13) and a plurality of side positioning surfaces (14), the end cutting area (11) and the side cutting areas (13) forming the cutting area of ​​the cutting component, and the side positioning surfaces (14) being provided with a plurality of side cutting areas (13) and a plurality of side positioning surfaces (14). 4) An inner mounting hole (15) is provided on the clamping component (2). The clamping component (2) includes a clamping groove (21) and a handle (22). The clamping groove (21) is provided with a bottom clamping surface (23) and a side clamping surface (24) corresponding to the bottom positioning surface (12) and the side positioning surface (14) respectively. An outer mounting hole (25) is provided on the side clamping surface (24). The fastener (3) can pass through the outer mounting hole (25) and the inner mounting hole (15) to install the cutting component (1) onto the clamping component (2). The characteristic is that: At least one of the side positioning surfaces (14) is provided with a side positioning protrusion (16), and a side clamping surface (24) corresponding to the side positioning surface (14) is provided with a side clamping recess (26). The side positioning protrusion (16) and the side clamping recess (26) form a concave-convex fit to determine the installation direction of the cutting component (1) and realize the circumferential clamping and positioning of the cutting component (1), thereby transmitting the cutting torque and cutting force between the cutting component (1) and the clamping component (2) during the cutting process.

2. The drilling tool with a concave-convex fit on its side as described in claim 1, characterized in that: The bottom positioning surface (12) is provided with a bottom positioning protrusion (17), and the bottom clamping surface (23) is provided with a bottom clamping recess (27). The bottom positioning protrusion (17) and the bottom clamping recess (27) form a concave-convex fit.

3. The drilling tool with a concave-convex fit on its side as described in claim 1 or 2, characterized in that: The side positioning protrusion (16) includes a plurality of parallel strip-shaped protrusions (161), and the side clamping recess (26) includes a plurality of parallel strip-shaped recesses (261) corresponding to the strip-shaped protrusions (161). The cutting component (1) is inserted in a straight line at an angle α between the mounting direction of the clamping component (2) and the rotation center axis (9) of the drilling tool, which should satisfy: 0°≤α≤25°.

4. The drilling tool with a concave-convex fit on its side as described in claim 3, characterized in that: The number of strip-shaped protrusions (161) is N1, and the number of strip-shaped recesses (261) is N2, which should satisfy: 2≤N1, N2≤10.

5. The drilling tool with a concave-convex fit on its side as described in claim 3, characterized in that: Each of the strip-shaped protrusions (161) is symmetrical about its positioning center line (162), and each of the strip-shaped recesses (261) is symmetrical about its clamping center line (262). 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 (9) 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 (9) is γ1. The following condition should be met: 30'≤γ2-γ1≤2°.

6. The drilling tool with a concave-convex fit on its side as described in claim 3, characterized in that: The two sides of the strip-shaped protrusion (161) are the outer straight positioning surface (1611) and the inner straight positioning surface (1612), respectively. The two sides of the strip-shaped recess (261) are the outer straight clamping surface (2611) and the inner straight clamping surface (2612), respectively. When the cutting component (1) is installed on the clamping component (2), the gap between the outer straight positioning surface (1611) and the corresponding outer straight clamping surface (2611) is λ1, which should satisfy: λ1=0.

7. The drilling tool with a concave-convex fit on its side as described in claim 6, characterized in that: The gap between the inner straight positioning surface (1612) and the corresponding inner straight clamping surface (2612) is λ2, which should satisfy: 0≤λ2≤0.3mm.

8. The drilling tool with a concave-convex fit on its side as described in claim 6, characterized in that: The included angle between the outer straight positioning surface (1611) and the inner straight positioning surface (1612) is β1, which should satisfy: 25°≤β1≤65°.

9. The drilling tool with a concave-convex fit on its side according to claim 2, characterized in that: The bottom positioning protrusion (17) includes multiple positioning protrusions (171), the two sides of which are bottom outer straight positioning surface (1711) and bottom inner straight positioning surface (1712). The bottom clamping recess (27) includes multiple clamping recesses (271), the two sides of which are bottom outer straight clamping surface (2711) and bottom inner straight clamping surface (2712). When the cutting component (1) is installed on the clamping component (2), the gap between the bottom outer straight positioning surface (1711) and the corresponding bottom outer straight clamping surface (2711) is λ3, and the gap between the bottom inner straight positioning surface (1712) and the corresponding bottom inner straight clamping surface (2712) is λ4. The following conditions should be met: λ3=λ4=0.

10. The drilling tool with a concave-convex fit on its side according to claim 9, characterized in that: The included angle between the outer bottom straight positioning surface (1711) and the inner bottom straight positioning surface (1712) is β2, which should satisfy: 25°≤β2≤65°.

11. The drilling tool with a concave-convex fit on its side according to claim 9, characterized in that: The number of positioning protrusions (171) is M1, and the number of clamping concave strips (271) is M2, which should satisfy: 2≤M1, M2≤8.

12. The drilling tool with a concave-convex fit on its side according to claim 1 or 2, characterized in that: The cutting side is provided with two identical side positioning surfaces (14), which are symmetrically arranged with respect to the rotation center axis (9) of the drilling tool. The clamping groove (21) is provided with two identical side clamping surfaces (24), which are symmetrically arranged with respect to the rotation center axis (9) of the drilling tool.

13. The drilling tool with a concave-convex fit on its side according to claim 1 or 2, characterized in that: The side positioning protrusion (16) includes multiple strip protrusions (161), which are arranged on a concentric circle with a minimum circumference of R. The cutting diameter of the cutting component (1) is D, which should satisfy: 30mm≤R≤10D.

14. The drilling tool with a concave-convex fit on its side according to claim 1 or 2, characterized in that: 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 its fastening center line (31). When the cutting component (1) is installed on the clamping component (2), the fastening center line (31) forms an eccentric distance τ relative to the hole center line (151) towards the shank (22), which should satisfy: 0.05mm≤τ≤0.3mm.

15. A drilling tool with a concave-convex fit on its side, comprising a cutting component (1), a clamping component (2), and a fastener (3), wherein the cutting component (1) includes an end cutting area (11), a bottom positioning surface (12), and a cutting side surface located between the end cutting area (11) and the bottom positioning surface (12), wherein the cutting side surface is provided with a plurality of side cutting areas (13) and a plurality of side positioning surfaces (14), the end cutting area (11) and the side cutting areas (13) forming the cutting area of ​​the cutting component, and the side positioning surfaces (14) 14) An inner mounting hole (15) is provided on the clamping component (2). The clamping component (2) includes a clamping groove (21) and a handle (22). The clamping groove (21) is provided with a bottom clamping surface (23) and a side clamping surface (24) corresponding to the bottom positioning surface (12) and the side positioning surface (14) respectively. An outer mounting hole (25) is provided on the side clamping surface (24). The fastener (3) can pass through the outer mounting hole (25) and the inner mounting hole (15) to install the cutting component (1) onto the clamping component (2). The characteristic is that: At least one of the side positioning surfaces (14) is provided with a side positioning recess (16'), and a side clamping surface (24) corresponding to the side positioning surface (14) is provided with a side clamping protrusion (26'). The side positioning recess (16') and the side clamping protrusion (26') form a concave-convex fit to determine the installation direction of the cutting component (1) and realize the circumferential clamping and positioning of the cutting component (1), thereby transmitting the cutting torque and cutting force between the cutting component (1) and the clamping component (2) during the cutting process.

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