A multifunctional modular cutter

Abstract

The present invention discloses a multifunctional modular cutting tool, which includes a clamping component, a core cutting component, a peripheral cutting component and a fastener. The clamping component includes a cutting portion and a clamping portion. A positioning groove is provided on the cutting portion, and a plurality of chip flutes penetrating the cutting portion are provided on the peripheral surface of the clamping component. The clamping portion is symmetrical about the rotation center axis. The core cutting component includes a core upper cutting portion, a core boss and a core lower cutting portion arranged in sequence. A core clamping hole is provided on the core boss. The peripheral cutting component includes a peripheral left cutting portion, a peripheral recess and a peripheral right cutting portion arranged in sequence. Both the core upper cutting portion and the core lower cutting portion can be independently combined with the peripheral cutting component for drilling. A peripheral clamping hole is provided on the peripheral recess. During assembly, the core boss and the peripheral recess form an axial concave-convex fit, and the fastener forms a threaded fit with the core clamping hole and the peripheral clamping hole to mount the core cutting component and the peripheral cutting component in the positioning groove. The present invention has the advantages of convenient loading and unloading, high positioning strength and accuracy, and good interchangeability, etc.

Description

Technical Field

[0001] The present invention mainly relates to the field of metal cutting, and in particular to a multi-functional modular tool. Background Art

[0002] In drilling, in order to extend the service life of the cutting part, relatively expensive cemented carbide or similar materials are usually used as the tool material. Since such materials have the characteristics of high hardness and good wear resistance, the processing is extremely difficult, which makes the material cost and processing cost of the drilling tool relatively high.

[0003] To solve the above technical problems, the commonly used drilling tools are generally assembled by a cutting part and a clamping part. Among them, the cutting part is made of cemented carbide or similar materials with high hardness and strong wear resistance, while the clamping part is made of materials with large elasticity. When the cutting part is worn, the cutting part can be replaced separately, thereby reducing the cost of drilling. However, such tools generally have low positioning accuracy, are prone to falling off, and have a short service life.

[0004] For example, Chinese Patent Document CN201511011147.4 discloses a drilling tool that uses interference clamping of threads. Although interference clamping of threads can be achieved, it is difficult to accurately control the interference size of the thread pitch diameter. At the same time, the interference position of the thread occurs on both sides of the thread profile, with a small contact area, poor circumferential centering ability of the tool tip, and complete contact of the axial positioning surface. When installed in batches, it is difficult to ensure the axial and circumferential runout accuracy of the tool tip. Secondly, the thread and torque surface of the tool tip form an over-positioning structure during use, and the contact stability of the torque surface is poor during batch interchange. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-functional modular tool that is convenient for loading and unloading, has high positioning strength and accuracy, and good versatility.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A multifunctional modular cutting tool includes a clamping component, a core cutting component, a peripheral cutting component, and a fastener. The clamping component includes a cutting part and a clamping part. A positioning groove is provided on the cutting part. A plurality of chip flutes penetrating the cutting part are provided on the circumferential surface of the clamping component. The clamping part is axisymmetric about the rotation center. The core cutting component includes a core upper cutting part, a core boss, and a core lower cutting part arranged in sequence. The core boss is located between the core upper positioning surface of the core upper cutting part and the core lower positioning surface of the core lower cutting part. A core clamping hole is provided on the core boss. The peripheral cutting component includes a peripheral left cutting part, a peripheral recess, and a peripheral right cutting part arranged in sequence. Both the core upper cutting part and the core lower cutting part can be independently combined with the peripheral cutting component for drilling. A peripheral clamping hole is provided on the peripheral recess. During assembly, the core boss and the peripheral recess form an axial concave-convex fit, and the fastener forms a threaded fit with the core clamping hole and the peripheral clamping hole to mount the core cutting component and the peripheral cutting component in the positioning groove.

[0008] As a further improvement of the above technical solution:

[0009] The positioning groove includes a groove top positioning surface, a groove bottom positioning surface, two groove side clamping surfaces, and a groove bottom recess provided on the groove bottom positioning surface. Mounting holes are provided on the groove side clamping surfaces. After the core cutting component and the peripheral cutting component are mounted in place in the positioning groove, the core upper cutting part or the core lower cutting part is located in the groove bottom recess, and the fastener is mounted in the mounting holes.

[0010] Both the core upper cutting part and the core lower cutting part include two core front cutting surfaces, two core rear cutting surfaces, two core side surfaces, and one core back surface. Any one of the core front cutting surfaces intersects with the adjacent core rear cutting surface and core side surface to form a core end cutting edge and a core side cutting edge respectively.

[0011] The core boss is provided with a core support surface and two core clamping surfaces respectively located on both sides of the core support surface. The core clamping surfaces include a core upper clamping surface, a core lower clamping surface, and a core middle clamping surface located between the core upper clamping surface and the core lower clamping surface. The core upper clamping surface and the core lower clamping surface form a V-shaped positioning structure, and the core clamping hole is provided on the core support surface.

[0012] Both the peripheral left cutting part and the peripheral right cutting part include a peripheral front cutting surface, a peripheral rear cutting surface, a peripheral side surface, a peripheral upper positioning surface, a peripheral lower positioning surface, and a peripheral side positioning surface. The peripheral front cutting surface intersects with the adjacent peripheral rear cutting surface and peripheral side surface to form a peripheral end cutting edge and a peripheral side cutting edge respectively.

[0013] The circumferential recess includes a circumferential recess support surface and two circumferential recess clamping surfaces respectively located on both sides of the circumferential recess support surface. The circumferential clamping hole is opened on the circumferential recess support surface. The circumferential recess clamping surface includes a circumferential upper clamping surface, a circumferential lower clamping surface and a circumferential middle clamping surface located between the circumferential upper clamping surface and the circumferential lower clamping surface. The circumferential upper clamping surface and the circumferential lower clamping surface are respectively matched and positioned with the core upper clamping surface and the core lower clamping surface. The circumferential upper positioning surface and the circumferential lower positioning surface are respectively matched and positioned with the core upper positioning surface and the core lower positioning surface. The circumferential recess support surface is matched and positioned with the core support surface.

[0014] The mounting hole includes a tapered hole and a threaded hole. The tapered hole is symmetric about the center of the tapered hole. The fastener includes a tapered head, a clamping column and a threaded portion. The threaded portion sequentially passes through the tapered hole, the core clamping hole and the circumferential clamping hole and is matched with the threaded hole. The tapered head is matched with the tapered hole.

[0015] During the process of screwing the fastener into the threaded hole, the gaps between the two groove-side clamping surfaces and the clamping and positioning surfaces and the circumferential-side positioning surfaces of the core cutting member gradually decrease to complete contact, and the gap between the core support surface and the circumferential recess support surface gradually decreases to complete contact.

[0016] The cutting diameter of the core upper cutting portion is D1, the cutting diameter of the core lower cutting portion is D3, and the cutting diameter of the circumferential cutting member is D2. The thickness of the core upper cutting portion and the core lower cutting portion in the cutting direction is W, and it should satisfy: 0.3D2 ≤ D1 ≤ 0.6D2, 0.7D1 ≤ D3 ≤ 1.3D1, 0.4D1 ≤ W ≤ 0.8D1.

[0017] The included angle between the core upper clamping surfaces of the two core clamping surfaces is α1, and the included angle between the circumferential upper clamping surfaces of the two circumferential recess clamping surfaces is α1'. It should satisfy: 20° ≤ α1 ≤ 50°, 20° ≤ α1' ≤ 50°, 0° ≤ α1 - α1' ≤ 0.5°.

[0018] The cutting tip angle of the core end cutting edge of the core upper cutting portion is α2, the cutting tip angle of the core end cutting edge of the core lower cutting portion is α3, and the cutting tip angle of the circumferential end cutting edge is α4. It should satisfy: 120° ≤ α2 ≤ 150°, 10° ≤ α2 - α3 ≤ 40°, 120° ≤ α4 ≤ 150°.

[0019] The maximum distance between the core end cutting edge of the core upper cutting portion and the core upper positioning surface is H1, and the maximum distance between the core end cutting edge of the core lower cutting portion and the core lower positioning surface is H2. It should satisfy: 0.8H2 ≤ H1 ≤ 1.2H2.

[0020] The included angle between the circumferential lower positioning surfaces of the circumferential left cutting part and the circumferential right cutting part is β'. The groove bottom positioning surface includes a groove bottom left positioning surface and a groove bottom right positioning surface corresponding to the circumferential lower positioning surfaces of the circumferential left cutting part and the circumferential right cutting part respectively. The included angle between the groove bottom left positioning surface and the groove bottom right positioning surface is β, and it should satisfy: 120° ≤ β ≤ 160°, 120° ≤ β' ≤ 160°, 0° ≤ β - β' ≤ 0.5°.

[0021] There is an included angle γ between the clamping and positioning surface of the core cutting component and the center line of the core clamping hole. The included angle between the circumferential side positioning surface and the center line of the circumferential clamping hole is γ', and it should satisfy: 65° ≤ γ ≤ 85°, 65° ≤ γ' ≤ 85°.

[0022] The gap between the core upper positioning surface and the groove top positioning surface is τ1, and it should satisfy: 0 ≤ τ1 ≤ 0.2 mm.

[0023] The gap between any core lower clamping surface and the corresponding circumferential lower clamping surface is τ2, and it should satisfy: 0 ≤ τ2 ≤ 0.05 mm.

[0024] During the process of loading the fastener into the core cutting component, the center line of the fastener completely coincides with the center line of the core clamping hole. There is an offset d between the center line of the tapered hole and the core clamping hole in the direction pointing to the core upper cutting part, and it should satisfy: 0.05 mm ≤ d ≤ 0.2 mm.

[0025] The groove bottom recess is provided with a groove bottom side surface, a groove bottom clamping surface and a groove bottom back surface. The core side surface is provided with a core side clearance surface. When the core upper cutting part cuts, the core side clearance surface and the core back surface of the core lower cutting part respectively cooperate with the groove bottom side surface and the groove bottom back surface. When the core lower cutting part cuts, the core side clearance surface and the core back surface of the core upper cutting part respectively correspond to the groove bottom side surface and the groove bottom back surface. The gap between the core side clearance surface and the groove bottom side surface is τ3, and the gap between the core back surface and the groove bottom back surface is τ4, and it should satisfy: 0.02 mm ≤ τ3 ≤ 0.15 mm, 0.02 mm ≤ τ4 ≤ 0.15 mm.

[0026] Compared with the prior art, the advantages of the present invention are as follows:

[0027] The multi-functional modular cutter of the present invention, the core cutting component includes a core upper cutting part, a core boss and a core lower cutting part arranged in sequence. The core boss is located between the core upper positioning surface of the core upper cutting part and the core lower positioning surface of the core lower cutting part. A core clamping hole is provided on the core boss. The peripheral cutting component includes a peripheral left cutting part, a peripheral recess and a peripheral right cutting part arranged in sequence. Both the core upper cutting part and the core lower cutting part can be independently combined with the peripheral cutting component for drilling. A peripheral clamping hole is provided on the peripheral recess. During assembly, the core boss and the peripheral recess form an axial concave-convex fit, and the fastener forms a threaded fit with the core clamping hole and the peripheral clamping hole to mount the core cutting component and the peripheral cutting component in the positioning groove. By using a structurally independent core upper cutting part, core lower cutting part and peripheral cutting component, the core upper cutting part and the core lower cutting part can adopt a geometric structure with strong centering ability and the same cemented carbide substrate and coating structure with good toughness, or can be designed into a specific and independent cemented carbide substrate and coating structure according to different cutting conditions. The peripheral cutting component can adopt a geometric structure with good strength and a cemented carbide substrate and coating structure with high wear resistance. When used in combination, it takes into account the impact resistance of the core upper cutting part and the core lower cutting part and the wear resistance of the peripheral cutting component, solves the technical problem that it is difficult to balance the hardness and toughness of the drilling tool, meets the processing requirements of various different working conditions, further reduces the use cost of the drilling tool. Both the core upper cutting part and the core lower cutting part can be independently combined with the peripheral cutting component for drilling, and the core upper cutting part and the core lower cutting part can be designed into other groove structure parameters such as specific cutting diameter, drilling depth and tip angle, etc., thus greatly improving the versatility of the modular drilling tool. The core boss and the peripheral recess form an axial concave-convex fit, and then the fastener forms a threaded fit with the core clamping hole and the peripheral clamping hole to mount the core cutting component and the peripheral cutting component in the positioning groove, realizing the axial clamping of the core cutting component and the peripheral cutting component, which is not only convenient for loading and unloading, but also has high positioning strength and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the three-dimensional exploded view of the multi-functional modular cutter of the present invention.

[0029] Figure 2 is the front view of the multi-functional modular cutter of the present invention.

[0030] Figure 3 is the left view of the multi-functional modular cutter of the present invention.

[0031] Figure 4 is Figure 2 the A-A view of

[0032] Figure 5 is the assembly schematic diagram of the cutting component and the fastener of the multi-functional modular cutter of the present invention.

[0033] Figure 6It is a three-dimensional structure diagram of the core cutting component of the multi-functional modular tool of the present invention.

[0034] Figure 7 It is the front view of the core cutting component of the multi-functional modular tool of the present invention.

[0035] Figure 8 It is Figure 7 the B-B view of

[0036] Figure 9 It is a three-dimensional structure diagram of the peripheral cutting component of the multi-functional modular tool of the present invention.

[0037] Figure 10 It is the front view of the peripheral cutting component of the multi-functional modular tool of the present invention.

[0038] Figure 11 It is the top view of the peripheral cutting component of the multi-functional modular tool of the present invention.

[0039] Figure 12 It is a three-dimensional structure diagram of the fastener of the multi-functional modular tool of the present invention.

[0040] Each reference numeral in the figure represents:

[0041] 1. Clamping component; 11. Cutting part; 12. Clamping part; 13. Positioning groove; 131. Groove top positioning surface; 132. Groove bottom positioning surface; 1321. Groove bottom left positioning surface; 1322. Groove bottom right positioning surface; 133. Groove side clamping surface; 134. Groove bottom recess; 1341. Groove bottom side surface; 1342. Groove bottom clamping surface; 1343. Groove bottom back surface; 135. Mounting hole; 1351. Taper hole; 1352. Threaded hole; 1353. Taper hole center; 14. Rotation center axis; 15. Chip flutes; 2. Core cutting component; 21. Upper core cutting part; 211. Upper core positioning surface; 22. Lower core cutting part; 221. Lower core positioning surface; 201. Core front cutting surface; 202. Core rear cutting surface; 203. Core side surface; 2031. Core side clearance surface; 204. Core back surface; 205. Core end cutting edge; 206. Core side cutting edge; 23. Core boss; 231. Core clamping surface; 2311. Upper core clamping surface; 2312. Lower core clamping surface; 2313. Middle core clamping surface; 232. Core support surface; 24. Core clamping hole; 25. Clamping positioning surface; 3. Peripheral cutting component; 31. Left peripheral cutting part; 32. Right peripheral cutting part; 33. Peripheral recess; 331. Peripheral recess clamping surface; 3311. Upper peripheral clamping surface; 3312. Lower peripheral clamping surface; 3313. Middle peripheral clamping surface; 332. Peripheral recess support surface; 34. Peripheral clamping hole; 301. Peripheral front cutting surface; 302. Peripheral rear cutting surface; 303. Peripheral side surface; 304. Upper peripheral positioning surface; 35. Lower peripheral positioning surface; 36. Peripheral side positioning surface; 37. Peripheral end cutting edge; 38. Peripheral side cutting edge; 4. Fastener; 41. Tapered head; 42. Clamping post; 43. Threaded part. Detailed implementation manners

[0042] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0044] Figures 1 to 12An embodiment of the multi-functional modular tool of the present invention is shown. The multi-functional modular tool includes a clamping component 1, a core cutting component 2, a peripheral cutting component 3, and a fastener 4. The clamping component 1 includes a cutting portion 11 and a clamping portion 12. A positioning groove 13 is provided on the cutting portion 11. A plurality of chip flutes 15 penetrating through the cutting portion 11 are provided on the peripheral surface of the clamping component 1. The clamping portion 12 is symmetric about the rotation center axis 14. The core cutting component 2 includes a core upper cutting portion 21, a core boss 23, and a core lower cutting portion 22 arranged in sequence. The core boss 23 is located between the core upper positioning surface 211 of the core upper cutting portion 21 and the core lower positioning surface 221 of the core lower cutting portion 22. A core clamping hole 24 is provided on the core boss 23. The peripheral cutting component 3 includes a peripheral left cutting portion 31, a peripheral recess 33, and a peripheral right cutting portion 32 arranged in sequence. Both the core upper cutting portion 21 and the core lower cutting portion 22 can be independently combined with the peripheral cutting component 3 for drilling. A peripheral clamping hole 34 is provided on the peripheral recess 33. During assembly, the core boss 23 and the peripheral recess 33 form an axial concave-convex fit. The fastener 4 forms a threaded fit with the core clamping hole 24 and the peripheral clamping hole 34 to mount the core cutting component 2 and the peripheral cutting component 3 in the positioning groove 13. By adopting the structurally independent core upper cutting portion 21, core lower cutting portion 22, and peripheral cutting component 3, the core upper cutting portion 21 and the core lower cutting portion 22 can either adopt a geometric structure with strong centering ability and the same carbide substrate and coating structure with good toughness, or can be designed into specific and independent carbide substrates and coating structures according to different cutting conditions. The peripheral cutting component 3 can adopt a geometric structure with good strength and a carbide substrate and coating structure with high wear resistance. When used in combination, the impact resistance of the core upper cutting portion 21 and the core lower cutting portion 22 and the wear resistance of the peripheral cutting component 3 are taken into account, solving the technical problem that it is difficult to balance the hardness and toughness of the drilling tool, meeting the processing requirements of various different working conditions, further reducing the use cost of the drilling tool. Both the core upper cutting portion 21 and the core lower cutting portion 22 can be independently combined with the peripheral cutting component 3 for drilling, and the core upper cutting portion 21 and the core lower cutting portion 22 can be designed into other groove structure parameters such as specific cutting diameters, drilling depths, and tip angles, thus greatly improving the versatility of the modular drilling tool. The core boss 23 and the peripheral recess 33 form an axial concave-convex fit, and then the fastener 4 forms a threaded fit with the core clamping hole 24 and the peripheral clamping hole 34 to mount the core cutting component 2 and the peripheral cutting component 3 in the positioning groove 13, realizing the axial clamping of the core cutting component 2 and the peripheral cutting component 3, which is not only convenient for loading and unloading, but also has high positioning strength and accuracy.

[0045] In this embodiment, the positioning groove 13 includes a groove top positioning surface 131, a groove bottom positioning surface 132, two groove side clamping surfaces 133, and a groove bottom recess 134 provided on the groove bottom positioning surface 132. An installation hole 135 is formed on the groove side clamping surface 133. After the core cutting component 2 and the peripheral cutting component 3 are installed in place in the positioning groove 13, the upper core cutting portion 21 or the lower core cutting portion 22 is located in the groove bottom recess 134, and the fastener 4 is installed in the installation hole 135.

[0046] In this embodiment, both the upper core cutting portion 21 and the lower core cutting portion 22 include two core front cutting surfaces 201, two core rear cutting surfaces 202, two core side surfaces 203, and one core back surface 204. Any core front cutting surface 201 intersects with the adjacent core rear cutting surface 202 and core side surface 203 to form a core end cutting edge 205 and a core side cutting edge 206 respectively. Both the upper core cutting portion 21 and the lower core cutting portion 22 have two core end cutting edges 205 and two core side cutting edges 206, and both can cooperate with the peripheral cutting component 3 to complete drilling processing, with strong versatility.

[0047] In this embodiment, a core support surface 232 and two core clamping surfaces 231 located on both sides of the core support surface 232 are provided on the core boss 23. The core clamping surface 231 includes an upper core clamping surface 2311, a lower core clamping surface 2312, and a middle core clamping surface 2313 located between the upper core clamping surface 2311 and the lower core clamping surface 2312. The upper core clamping surface 2311 and the lower core clamping surface 2312 form a V-shaped positioning structure. The core clamping hole 24 is formed on the core support surface 232. Both the left peripheral cutting portion 31 and the right peripheral cutting portion 32 include a peripheral front cutting surface 301, a peripheral rear cutting surface 302, a peripheral side surface 303, an upper peripheral positioning surface 304, a lower peripheral positioning surface 35, and a peripheral side positioning surface 36. The peripheral front cutting surface 301 intersects with the adjacent peripheral rear cutting surface 302 and peripheral side surface 303 to form a peripheral end cutting edge 37 and a peripheral side cutting edge 38 respectively. The peripheral recess 33 includes a peripheral recess support surface 332 and two peripheral recess clamping surfaces 331 located on both sides of the peripheral recess support surface 332. The peripheral clamping hole 34 is formed on the peripheral recess support surface 332. The peripheral recess clamping surface 331 includes an upper peripheral clamping surface 3311, a lower peripheral clamping surface 3312, and a middle peripheral clamping surface 3313 located between the upper peripheral clamping surface 3311 and the lower peripheral clamping surface 3312. The upper peripheral clamping surface 3311 and the lower peripheral clamping surface 3312 are respectively matched and positioned with the upper core clamping surface 2311 and the lower core clamping surface 2312. The upper peripheral positioning surface 304 and the lower peripheral positioning surface 35 are respectively matched and positioned with the upper core positioning surface 211 and the lower core positioning surface 221. The peripheral recess support surface 332 is matched and positioned with the core support surface 232. The core boss 23 and the peripheral recess 33 form a V-shaped positioning and clamping, effectively improving the installation dimension accuracy and positioning stability of the core cutting component 2 and the peripheral cutting component 3, and enabling the core cutting component 2 and the peripheral cutting component 3 to have the advantages of good interchangeability and consistency, high cutting efficiency, and long service life.

[0048] In this embodiment, the mounting hole 135 includes a tapered hole 1351 and a threaded hole 1352. The tapered hole 1351 is symmetric about the tapered hole center 1353. The fastener 4 includes a tapered head 41, a clamping column 42, and a threaded portion 43. The threaded portion 43 sequentially passes through the tapered hole 1351, the core clamping hole 24, and the circumferential clamping hole 34 and cooperates with the threaded hole 1352. The tapered head 41 cooperates with the tapered hole 1351. During the process of screwing the fastener 4 into the threaded hole 1352, the gaps between the two groove side clamping surfaces 133 and the clamping and positioning surface 25 of the core cutting member 2 and the circumferential side positioning surface 36 gradually decrease until they are in full contact, and the gap between the core support surface 232 and the circumferential recessed support surface 332 gradually decreases until they are in full contact. During the process of tightening the fastener 4, the positioning groove 13 realizes the elastic positioning and clamping of the core cutting member 2 and the circumferential cutting member 3, improving the positioning strength and stability.

[0049] In this embodiment, the cutting diameter of the upper core cutting portion 21 is D1, the cutting diameter of the lower core cutting portion 22 is D3, and the cutting diameter of the circumferential cutting member 3 is D2. The thickness of the upper core cutting portion 21 and the lower core cutting portion 22 in the cutting direction is W. To ensure the strength and cutting stability of the core cutting member 2 and the circumferential cutting member 3, it should satisfy: 0.3D2 ≤ D1 ≤ 0.6D2, 0.7D1 ≤ D3 ≤ 1.3D1, 0.4D1 ≤ W ≤ 0.8D1. In this embodiment, D1 = 45D2 and W = 0.6D1.

[0050] In this embodiment, the angle between the upper core clamping surfaces 2311 of the two core clamping surfaces 231 is α1, and the angle between the upper circumferential clamping surfaces 3311 of the two circumferential recessed clamping surfaces 331 is α1'. To ensure the positioning stability of the core cutting member 2 and the circumferential cutting member 3 and improve the drilling processing dimension accuracy and surface quality, it should satisfy: 20° ≤ α1 ≤ 50°, 20° ≤ α1' ≤ 50°, 0° ≤ α1 - α1' ≤ 0.5°. In this embodiment, α1 = 35° and α1' = 34.7°.

[0051] In this embodiment, the cutting vertex angle of the core end cutting edge 205 of the upper core cutting portion 21 is α2, the cutting vertex angle of the core end cutting edge 205 of the lower core cutting portion 22 is α3, and the cutting vertex angle of the circumferential end cutting edge 37 is α4. To ensure that when the upper core cutting portion 21 and the lower core cutting portion 22 of the core cutting member 2 are combined with the circumferential cutting member 3, different materials and cutting parameters can be applied, it should satisfy: 120° ≤ α2 ≤ 150°, 10° ≤ α2 - α3 ≤ 40°, 120° ≤ α4 ≤ 150°. In this embodiment, α2 = 140°, α3 = 120°, and α4 = 142°.

[0052] In this embodiment, the maximum distance between the core end cutting edge 205 of the core upper cutting part 21 and the core upper positioning surface 211 is H1, and the maximum distance between the core end cutting edge 205 of the core lower cutting part 22 and the core lower positioning surface 221 is H2. To ensure that the drilling tool formed by the combination of the same core cutting component 2 and the peripheral cutting component 3 can form stepped holes with different depths on the workpiece to meet the requirements of different cutting conditions, it should satisfy: 0.8H2 ≤ H1 ≤ 1.2H2. In this embodiment, H1 = 0.95H2.

[0053] In this embodiment, the included angle between the lower peripheral positioning surfaces 35 of the left peripheral cutting part 31 and the right peripheral cutting part 32 is β'. The groove bottom positioning surface 132 includes a groove bottom left positioning surface 1321 and a groove bottom right positioning surface 1322 corresponding to the lower peripheral positioning surfaces 35 of the left peripheral cutting part 31 and the right peripheral cutting part 32 respectively. The included angle between the groove bottom left positioning surface 1321 and the groove bottom right positioning surface 1322 is β. To ensure the positioning stability and strength of the core peripheral cutting component 3 and improve the dimensional accuracy and surface quality of the drilling process, it should satisfy: 120° ≤ β ≤ 160°, 120° ≤ β' ≤ 160°, 0° ≤ β - β' ≤ 0.5°. In this embodiment, β = 142°, β' = 141.85°.

[0054] In this embodiment, there is an included angle γ between the clamping and positioning surface 25 of the core cutting component 2 and the center line of the core clamping hole 24, and an included angle γ' between the peripheral side positioning surface 36 and the center line of the peripheral clamping hole 34. To ensure the clamping and positioning stability of the clamping component 1 for the core cutting component 2 and the peripheral cutting component 3 and ensure the strength of the core cutting component 2, it should satisfy: 65° ≤ γ ≤ 85°, 65° ≤ γ' ≤ 85°. In this embodiment, γ = γ' = 73°.

[0055] In this embodiment, the gap between the core upper positioning surface 211 and the groove top positioning surface 131 is τ1. To ensure the stability and impact resistance of the cutting edge of the core upper cutting part 21 of the core cutting component 2, it should satisfy: 0 ≤ τ1 ≤ 0.2 mm. In this embodiment, τ1 = 0.02 mm.

[0056] In this embodiment, the gap between any core lower clamping surface 2312 and the corresponding peripheral lower clamping surface 3312 is τ2. To improve the positioning stability of the core cutting component 2, reduce the load on the fastener 4 and avoid axial loosening of the core cutting component 2, it should satisfy: 0 ≤ τ2 ≤ 0.05 mm. In this embodiment, τ2 = 0.03 mm.

[0057] In this embodiment, during the process of installing the fastener 4 into the core cutting component 2, the center line of the fastener 4 completely coincides with the center line of the core clamping hole 24. There is an offset d between the center line of the tapered hole 1351 and the core clamping hole 24 in the direction pointing to the upper core cutting part 21. To ensure that all positioning surfaces can be in complete contact when the assembly is in place and improve the positioning stability of the core cutting component 2 and the peripheral cutting component 3, it should satisfy: 0.05 mm ≤ d ≤ 0.2 mm. In this embodiment, d = 0.12 mm.

[0058] In this embodiment, the bottom of the groove 134 is provided with a bottom groove side surface 1341, a bottom groove clamping surface 1342, and a bottom groove back surface 1343. The core side surface 203 is provided with a core side clearance surface 2031. When the upper core cutting part 21 is cutting, the core side clearance surface 2031 and the core back surface 204 of the lower core cutting part 22 respectively cooperate with the bottom groove side surface 1341 and the bottom groove back surface 1343. When the lower core cutting part 22 is cutting, the core side clearance surface 2031 and the core back surface 204 of the upper core cutting part 21 respectively correspond to the bottom groove side surface 1341 and the bottom groove back surface 1343. The clearance between the core side clearance surface 2031 and the bottom groove side surface 1341 is τ3, and the clearance between the core back surface 204 and the bottom groove back surface 1343 is τ4. To ensure that the core cutting component 2 can be accurately and quickly installed when the upper core cutting part 21 and the lower core cutting part 22 are cutting, it should satisfy: 0.02 mm ≤ τ3 ≤ 0.15 mm, 0.02 mm ≤ τ4 ≤ 0.15 mm. In this embodiment, τ3 = τ4 = 0.05 mm.

[0059] In the above embodiments, it is the application of the present invention application to the drilling tool. The present invention is not limited thereto. According to different cutting application working conditions, the present invention application can also be applied to other machining tools such as milling cutters.

[0060] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-functional modular tool, comprising a clamping component (1), a core cutting component (2), a peripheral cutting component (3) and a fastener (4), wherein the clamping component (1) includes a cutting part (11) and a clamping part (12), a positioning groove (13) is provided on the cutting part (11), a plurality of chip flutes (15) penetrating through the cutting part (11) are provided on the circumferential surface of the clamping component (1), the clamping part (12) is symmetric about the rotation central axis (14), and it is characterized in that: The core cutting component (2) includes a core upper cutting part (21), a core boss (23), and a core lower cutting part (22) arranged in sequence. The core boss (23) is located between the core upper positioning surface (211) of the core upper cutting part (21) and the core lower positioning surface (221) of the core lower cutting part (22). A core clamping hole (24) is formed on the core boss (23). The peripheral cutting component (3) includes a peripheral left cutting part (31), a peripheral recess (33), and a peripheral right cutting part (32) arranged in sequence. Both the core upper cutting part (21) and the core lower cutting part (22) can be independently combined with the peripheral cutting component (3) for drilling. A peripheral clamping hole (34) is formed on the peripheral recess (33). During assembly, the core boss (23) and the peripheral recess (33) form an axial concave-convex fit, and the fastener (4) forms a threaded fit with the core clamping hole (24) and the peripheral clamping hole (34) to mount the core cutting component (2) and the peripheral cutting component (3) in the positioning groove (13).

2. The multi-functional modular tool according to claim 1, wherein: The positioning groove (13) includes a groove top positioning surface (131), a groove bottom positioning surface (132), two groove side clamping surfaces (133), and a groove bottom recess (134) formed on the groove bottom positioning surface (132). Mounting holes (135) are formed on the groove side clamping surfaces (133). After the core cutting component (2) and the peripheral cutting component (3) are mounted in place in the positioning groove (13), the core upper cutting part (21) or the core lower cutting part (22) is located in the groove bottom recess (134), and the fastener (4) is mounted in the mounting hole (135).

3. The multi-functional modular cutting tool according to claim 2, wherein: Both the core upper cutting part (21) and the core lower cutting part (22) include two core front cutting surfaces (201), two core rear cutting surfaces (202), two core side surfaces (203), and one core back surface (204). Any one of the core front cutting surfaces (201) intersects with the adjacent core rear cutting surface (202) and core side surface (203) to form a core end cutting edge (205) and a core side cutting edge (206) respectively.

4. The multi-functional modular cutter according to claim 3, wherein: The core boss (23) is provided with a core support surface (232) and two core clamping surfaces (231) respectively located on both sides of the core support surface (232). The core clamping surface (231) includes a core upper clamping surface (2311), a core lower clamping surface (2312), and a core middle clamping surface (2313) located between the core upper clamping surface (2311) and the core lower clamping surface (2312). The core upper clamping surface (2311) and the core lower clamping surface (2312) form a V-shaped positioning structure, and the core clamping hole (24) is formed on the core support surface (232).

5. The multi-functional modular cutting tool according to claim 4, wherein: Both the peripheral left cutting part (31) and the peripheral right cutting part (32) include a peripheral front cutting surface (301), a peripheral rear cutting surface (302), a peripheral side surface (303), a peripheral upper positioning surface (304), a peripheral lower positioning surface (35), and a peripheral side positioning surface (36). The peripheral front cutting surface (301) intersects with the adjacent peripheral rear cutting surface (302) and peripheral side surface (303) to form a peripheral end cutting edge (37) and a peripheral side cutting edge (38) respectively.

6. The multifunctional modular cutter according to claim 5, characterized in that: The circumferential recess (33) includes a circumferential recess support surface (332) and two circumferential recess clamping surfaces (331) respectively located on both sides of the circumferential recess support surface (332). The circumferential clamping hole (34) is formed on the circumferential recess support surface (332). The circumferential recess clamping surface (331) includes a circumferential upper clamping surface (3311), a circumferential lower clamping surface (3312), and a circumferential middle clamping surface (3313) located between the circumferential upper clamping surface (3311) and the circumferential lower clamping surface (3312). The circumferential upper clamping surface (3311) and the circumferential lower clamping surface (3312) are respectively matched and positioned with the core upper clamping surface (2311) and the core lower clamping surface (2312). The circumferential upper positioning surface (304) and the circumferential lower positioning surface (35) are respectively matched and positioned with the core upper positioning surface (211) and the core lower positioning surface (221). The circumferential recess support surface (332) is matched and positioned with the core support surface (232).

7. The multi-functional modular cutter according to claim 5 or 6, characterized in that: The mounting hole (135) includes a tapered hole (1351) and a threaded hole (1352). The tapered hole (1351) is symmetric about the tapered hole center (1353). The fastener (4) includes a tapered head (41), a clamping column (42), and a threaded portion (43). The threaded portion (43) sequentially passes through the tapered hole (1351), the core clamping hole (24), and the circumferential clamping hole (34) and is matched with the threaded hole (1352). The tapered head (41) is matched with the tapered hole (1351).

8. The multi-functional modular tool according to claim 7, characterized in that: During the process of screwing the fastener (4) into the threaded hole (1352), the gaps between the two groove-side clamping surfaces (133) and the clamping and positioning surface (25) and the circumferential-side positioning surface (36) of the core cutting member (2) gradually decrease until they are in full contact, and the gap between the core support surface (232) and the circumferential recess support surface (332) gradually decreases until they are in full contact.

9. The multi-functional modular cutter according to claim 5 or 6, characterized in that: The cutting diameter of the core upper cutting portion (21) is D1, the cutting diameter of the core lower cutting portion (22) is D3, and the cutting diameter of the circumferential cutting member (3) is D2. The thickness of the core upper cutting portion (21) and the core lower cutting portion (22) in the cutting direction is W, and it should satisfy: 0.3D2 ≤ D1 ≤ 0.6D2, 0.7D1 ≤ D3 ≤ 1.3D1, 0.4D1 ≤ W ≤ 0.8D1.

10. The multifunctional modular cutting tool according to claim 6, wherein: The included angle between the core upper clamping surfaces (2311) of the two core clamping surfaces (231) is α1, and the included angle between the circumferential upper clamping surfaces (3311) of the two circumferential recess clamping surfaces (331) is α1'. It should satisfy: 20° ≤ α1 ≤ 50°, 20° ≤ α1' ≤ 50°, 0° ≤ α1 - α1' ≤ 0.5°.

11. The multi-functional modular cutter according to claim 5 or 6, characterized in that: The cutting vertex angle of the core end cutting edge (205) of the core upper cutting portion (21) is α2, the cutting vertex angle of the core end cutting edge (205) of the core lower cutting portion (22) is α3, and the cutting vertex angle of the circumferential end cutting edge (37) is α4. It should satisfy: 120° ≤ α2 ≤ 150°, 10° ≤ α2 - α3 ≤ 40°, 120° ≤ α4 ≤ 150°.

12. The multi-functional modular cutter according to claim 5 or 6, characterized in that: The maximum distance between the core-end cutting edge (205) of the upper-core cutting part (21) and the upper-core positioning surface (211) is H1, and the maximum distance between the core-end cutting edge (205) of the lower-core cutting part (22) and the lower-core positioning surface (221) is H2, and it should satisfy: 0.8H2 ≤ H1 ≤ 1.2H2.

13. The multi-functional modular cutter according to claim 5 or 6, characterized in that: The included angle between the lower-peripheral positioning surfaces (35) of the left-peripheral cutting part (31) and the right-peripheral cutting part (32) is β'. The groove-bottom positioning surface (132) includes a groove-bottom left positioning surface (1321) and a groove-bottom right positioning surface (1322) corresponding to the lower-peripheral positioning surfaces (35) of the left-peripheral cutting part (31) and the right-peripheral cutting part (32) respectively. The included angle between the groove-bottom left positioning surface (1321) and the groove-bottom right positioning surface (1322) is β, and it should satisfy: 120° ≤ β ≤ 160°, 120° ≤ β' ≤ 160°, 0° ≤ β - β' ≤ 0.5°.

14. The multi-functional modular cutter according to claim 7, characterized in that: There is an included angle γ between the clamping and positioning surface (25) of the core cutting component (2) and the center line of the core clamping hole (24), and the included angle between the peripheral positioning surface (36) and the center line of the peripheral clamping hole (34) is γ', and it should satisfy: 65° ≤ γ ≤ 85°, 65° ≤ γ' ≤ 85°.

15. The multi-functional modular cutter according to claim 14, wherein: The gap between the upper-core positioning surface (211) and the groove-top positioning surface (131) is τ1, and it should satisfy: 0 ≤ τ1 ≤ 0.2 mm.

16. The multi-functional modular cutter according to claim 14, characterized in that: The gap between any lower-core clamping surface (2312) and the corresponding lower-peripheral clamping surface (3312) is τ2, and it should satisfy: 0 ≤ τ2 ≤ 0.05 mm.

17. The multifunctional modular cutter according to claim 14, characterized in that: During the process of loading the fastener (4) into the core cutting component (2), the center line of the fastener (4) completely coincides with the center line of the core clamping hole (24). There is an offset d between the center line of the tapered hole (1351) and the core clamping hole (24) in the direction pointing to the upper-core cutting part (21), and it should satisfy: 0.05 mm ≤ d ≤ 0.2 mm.

18. The multi-functional modular cutter according to claim 14, wherein: The groove-bottom recess (134) is provided with a groove-bottom side surface (1341), a groove-bottom clamping surface (1342) and a groove-bottom back surface (1343). The core side surface (203) is provided with a core-side clearance surface (2031). When the upper-core cutting part (21) cuts, the core-side clearance surface (2031) and the core back surface (204) of the lower-core cutting part (22) respectively cooperate with the groove-bottom side surface (1341) and the groove-bottom back surface (1343). When the lower-core cutting part (22) cuts, the core-side clearance surface (2031) and the core back surface (204) of the upper-core cutting part (21) respectively correspond to the groove-bottom side surface (1341) and the groove-bottom back surface (1343). The gap between the core-side clearance surface (2031) and the groove-bottom side surface (1341) is τ3, and the gap between the core back surface (204) and the groove-bottom back surface (1343) is τ4, and it should satisfy: 0.02 mm ≤ τ3 ≤ 0.15 mm, 0.02 mm ≤ τ4 ≤ 0.15 mm.

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