CN114789272A - Drilling tool - Google Patents
Drilling tool Download PDFInfo
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- CN114789272A CN114789272A CN202210637847.5A CN202210637847A CN114789272A CN 114789272 A CN114789272 A CN 114789272A CN 202210637847 A CN202210637847 A CN 202210637847A CN 114789272 A CN114789272 A CN 114789272A
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- 238000005553 drilling Methods 0.000 title claims abstract description 54
- 230000002093 peripheral effect Effects 0.000 claims abstract description 90
- 238000002161 passivation Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
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Abstract
The invention discloses a drilling tool, which comprises a tool body and a cutting blade, wherein the tool body comprises a clamping handle part, a cutting end part and a tool body peripheral surface positioned between the clamping handle part and the cutting end part, the clamping handle part and the tool body peripheral surface are symmetrical about a rotating central shaft of the cutting tool body, a chip containing groove is formed in the tool body peripheral surface, a tool groove communicated with the chip containing groove is formed in the cutting end part, the cutting blade is fixedly arranged in the tool groove, the chip containing groove comprises a concave surface, and the bottom surface of the concave surface is outwards in an arch-shaped structure.
Description
Technical Field
The invention mainly relates to the field of metal cutting machining, in particular to a drilling tool.
Background
Due to the fact that hard alloy materials are scarce, expensive and difficult to process, the use cost of the whole hard alloy drilling tool is high, the application of the whole hard alloy drilling tool is limited, and with the improvement of assembly technology, a split type drilling tool appears, namely a cutting part of the drilling tool is made of hard alloy, a clamping part is made of a low-hardness steel material, and the cutting part can be independently replaced after being worn.
However, in the drilling process of the drilling tool with the clamping component made of the steel material, as the cutting part of the tool completely penetrates into the workpiece and forms a closed area with the workpiece, the chips are difficult to curl and are difficult to discharge, and in order to ensure the cutting performance of the drilling tool, the drilling tool is generally provided with a large-area chip groove.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a drilling tool with good rigidity, large drilling depth and smooth chip removal.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a drilling tool, includes cutter body and cutting blade, the cutter body includes centre gripping stalk portion, cutting end and is located cutter body between centre gripping stalk portion, the cutting end is global all about the rotation center axis symmetry of cutting cutter body, the chip container has been seted up on the cutter body is global, be equipped with on the cutting end with the communicating sword groove of chip container, the cutting blade is fixed to be installed in the sword inslot, the chip container includes the concave recess face, the bottom surface of concave recess face outwards is the arch form structure.
As a further improvement of the above technical solution:
the cutting blade comprises a core cutting blade positioned on a rotating central shaft, the concave surface of a chip pocket corresponding to the core cutting blade is a core concave surface, the core concave surface comprises a core upper straight rotating surface, a core lower straight rotating surface and a core concave bottom surface, and the core concave bottom surface is arranged between the core upper straight rotating surface and the core lower straight rotating surface.
The core concave bottom surface comprises two core bottom straight side surfaces and a core bottom straight top surface positioned between the two core bottom straight side surfaces, and in a plane which is orthogonal to the rotation central shaft and intersected with the core concave bottom surface, the included angle of the two core bottom straight side surfaces is alpha, and the core concave bottom surface can meet the following requirements: alpha is more than or equal to 120 degrees and less than or equal to 160 degrees.
The diameter of the drilling tool is D, and the width of the straight top surface of the core bottom in a plane which is orthogonal to the rotation central axis and intersects with the concave surface of the core is W, so that the following conditions are met: w is more than or equal to 0.1D and less than or equal to 0.2D.
The minimum distance between the center of the straight top surface at the bottom of the core and the periphery of the cutter body is L, and the minimum distance satisfies the following conditions: l is more than or equal to 0.05D and less than or equal to 0.1D.
The straight top surface middle part at the bottom of the core is equipped with concave core arc surface, concave core arc surface radius is R, should satisfy: r is more than or equal to 0.07D and less than or equal to 0.15D.
In a plane which is orthogonal to the rotation central shaft and is intersected with the concave surface of the core, an included angle between the upper straight rotating surface of the core and the lower straight rotating surface of the core is beta, and the following conditions are met: beta is more than or equal to 10 degrees and less than or equal to 40 degrees.
The core angle arc surface is arranged between the core bottom straight side surface and the corresponding core upper straight rotary surface or the core lower straight rotary surface, the tangent distance between the core angle arc surface and the core bottom straight top surface is H in a plane which is orthogonal to the rotation central shaft and intersected with the core concave surface, and the requirements are met: h is more than or equal to 0.02D and less than or equal to 0.1D.
Passivation surfaces are arranged between the upper straight rotating surface of the core, the lower straight rotating surface of the core and the circumferential surface of the cutter body.
The cutting blade is including being located the core cutting blade on the rotation center axle and being located the peripheral cutting blade on the cutter body peripherical, the concave surface of the chip pocket that the core cutting blade corresponds is core concave surface, core concave surface is including straight spiral surface on the core, straight spiral surface under the core and core concave bottom surface, core concave bottom surface is located between straight spiral surface and the straight spiral surface under the core on the core, the concave surface of the chip pocket that the peripheral cutting blade corresponds is week concave surface, week concave surface is including straight spiral surface on week, straight spiral surface under week and week concave bottom surface, week concave bottom surface is located between straight spiral surface on week and the straight spiral surface under week.
The peripheral concave bottom surface comprises two peripheral straight side surfaces and a peripheral straight top surface positioned between the two peripheral straight side surfaces, and in a plane which is orthogonal to the rotation central axis and intersected with the peripheral concave surface, the included angle of the two peripheral straight side surfaces is alpha', and the following conditions are met: alpha' is more than or equal to 100 degrees and less than or equal to 140 degrees.
The diameter of the drilling tool is D, and the width of the peripheral straight top surface in a plane which is orthogonal to the rotation central axis and intersects with the peripheral concave surface is W', and the following conditions are met: w' is more than or equal to 0.01D and less than or equal to 0.15D.
The minimum distance between the center of the peripheral straight top surface and the peripheral surface of the cutter body is L', and the minimum distance satisfies the following conditions: l' is more than or equal to 0.1D and less than or equal to 0.2D.
The circumference concave bottom surface is provided with a circumference concave arc surface in the middle, the circumference concave arc surface is R', and the following requirements are met: r' is more than or equal to 0.07D and less than or equal to 0.15D.
In a plane which is orthogonal to the rotation central axis and intersected with the core concave surface, an included angle between the core upper straight rotating surface and the core lower straight rotating surface is beta, and in a plane which is orthogonal to the rotation central axis and intersected with the peripheral concave surface, an included angle between the peripheral upper straight rotating surface and the peripheral lower straight rotating surface is beta', and the following requirements are met: beta is more than or equal to 10 degrees and less than or equal to 40 degrees, and beta' -beta is more than or equal to 10 degrees and less than or equal to 40 degrees.
The core bottom straight side face and the corresponding core upper straight rotary face or the core lower straight rotary face are provided with a core angle arc face, the tangent distance between the core angle arc face and the core top straight side face is H in a plane which is orthogonal to the rotation central shaft and is intersected with the core concave face, the tangent distance between the circumference straight side face and the corresponding circumference upper straight rotary face or circumference lower straight rotary face is provided with a circumference angle arc face, the tangent distance between the circumference angle arc face and the circumference straight top face is H 'in a plane which is orthogonal to the rotation central shaft and is intersected with the circumference concave face, and the tangent distance between the circumference angle arc face and the circumference straight top face is H' and meets the following requirements: h is more than or equal to 0.02D and less than or equal to 0.1D, and H' -H is more than or equal to 0.02D and less than or equal to 0.1D.
Compared with the prior art, the invention has the advantages that:
the drilling tool of the invention comprises a tool body and a cutting blade, wherein the tool body comprises a clamping handle part, a cutting end part and a tool body peripheral surface positioned between the clamping handle part and the cutting end part, the clamping handle part and the tool body peripheral surface are symmetrical about a rotating central shaft of the cutting tool body, the tool body peripheral surface is provided with a chip containing groove, the cutting end part is provided with a tool groove communicated with the chip containing groove, the cutting blade is fixedly arranged in the tool groove, the chip containing groove comprises a concave surface, the bottom surface of the concave surface outwards presents an arch structure, the bottom surface of the concave surface is outwardly presented with the arch structure, the rigidity of the drilling tool can be greatly improved, the drilling size precision, the drilling surface quality and the maximum allowable drilling depth of the tool are improved, the tool can still stably cut even if the diameter of the tool is over 7 times, and the chip discharge capacity of the chip containing groove does not completely depend on the chip containing groove structure with the size of the concave sectional area, the chip evacuation capability of the drilling tool can be greatly improved.
Drawings
Fig. 1 is a perspective view of a first embodiment of a drilling tool of the present invention.
Fig. 2 is a front view of a first embodiment of the drilling tool of the present invention.
Fig. 3 is a view a-a of fig. 2.
Fig. 4 is a perspective view of a second embodiment of the drilling tool of the present invention.
Fig. 5 is a front view of a second embodiment of the drilling tool of the present invention.
Fig. 6 is a view B-B of fig. 5.
The reference numerals in the figures denote:
1. a cutter body; 2. a cutting insert; 21. a core cutting blade; 22. a peripheral cutting blade; 3. cutting the end portion; 4. clamping the handle; 5. a knife slot; 6. the peripheral surface of the cutter body; 7. a chip pocket; 8. a recessed face; 81. a core recessed face; 811. a straight rotary surface is arranged on the core; 812. a straight rotary surface below the core; 813. the core is recessed into the bottom surface; 8131. a core bottom straight side; 8132. a core bottom straight top surface; 814. a concave core arc surface; 815. a core angle arc surface; 82. a peripheral concave surface; 821. a straight rotary surface is arranged on the periphery; 822. a lower straight rotary surface is formed; 823. the circumference is concave to the bottom surface; 8231. a peripheral straight side; 8232. a peripheral straight top surface; 824. a circumferentially concave arc surface; 825. a circumferential angle arc surface; 9. passivating the surface; 10. a fastener; 11. the central shaft is rotated.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
Fig. 1 to 3 show a first embodiment of a split drilling tool according to the present invention, which includes a tool body 1 and a cutting insert 2, wherein the tool body 1 includes a clamping shank portion 4, a cutting end portion 3, and a tool body peripheral surface 6 located between the clamping shank portion 4 and the cutting end portion 3, the clamping shank portion 4 and the tool body peripheral surface 6 are symmetrical with respect to a rotation center axis 11 of the cutting tool body 2, a chip pocket 7 is formed on the tool body peripheral surface 6, a tool pocket 5 communicating with the chip pocket 7 is formed on the cutting end portion 3, the cutting insert 2 is fixedly mounted in the tool pocket 5, the chip pocket 7 includes a recessed surface 8, a bottom surface of the recessed surface 8 is outwardly arched, chips of a specific shape formed by the cutting insert 2 are not pressed by the bottom surface of the recessed surface 8 in a large area, smoothness of chip removal is improved, and rigidity of the drilling tool is greatly improved, therefore, the drilling size precision, the drilling surface quality and the maximum allowable drilling depth of the cutter are improved, the cutter can still stably cut even when the diameter of the cutter is over 7 times, the chip discharge capacity of the chip groove 7 does not completely depend on the chip groove structure with the size of the recessed cross section area, and the chip discharge capacity of the drilling cutter can be greatly improved.
In the present embodiment, the cutting insert 2 includes a core cutting insert 21 located on the rotation center axis 11, the recess surface 8 of the chip pocket 7 corresponding to the core cutting insert 21 is a core recess surface 81, the core recess surface 81 includes a core upper straight-rotation surface 811, a core lower straight-rotation surface 812, and a core recess bottom surface 813, and the core recess bottom surface 813 is provided between the core upper straight-rotation surface 811 and the core lower straight-rotation surface 812.
In this embodiment, the core recessed bottom surface 813 includes two core bottom straight side surfaces 8131 and a core bottom straight top surface 8132 located between the two core bottom straight side surfaces 8131, in order to avoid the chip contact between the core upper straight spiral surface 811 or the core lower straight spiral surface 812 and the core bottom straight side surface 8131, the chip removal effect of the core recessed surface 81 is improved, in the plane orthogonal to the rotation center axis 11 and intersecting with the core recessed surface 81, the included angle between the two core bottom straight side surfaces 8131 is α, and it should be satisfied: α is 120 ° or more and 160 ° or less, and in the present embodiment, α is 140 °.
In this embodiment, the diameter of the drilling tool is D, the width of the core bottom straight top surface 8132 is W in a plane orthogonal to the rotation center axis 11 and intersecting the core recessed surface 81, and in order to control the size of the chip contact area between the core top straight surface 811 or the core bottom straight top surface 812 and the core bottom straight top surface 8231, the following requirements should be satisfied: 0.1D ≦ W ≦ 0.2D, and in this example, W ≦ 0.15D.
In this embodiment, the minimum distance between the center of the straight top surface 8132 of the core bottom and the peripheral surface 6 of the cutter body is L, and in order to ensure the discharge capability of chips with specific shapes in the recessed core surface 81, the following requirements should be satisfied: 0.05D ≦ L ≦ 0.1D, and in this example, L ═ 0.15D.
In this embodiment, the straight top surface 8132 middle part at the bottom of the core is equipped with concave core arc surface 814, concave core arc surface 814 radius is R, for the flow direction of accurate control smear metal in the straight top surface 8132 at the bottom of the core, should satisfy: 0.07D ≦ R ≦ 0.15D, and in this example, R ≦ 0.1D.
In the present embodiment, in the plane orthogonal to the rotation center axis 11 and intersecting the core recess surface 81, the angle between the core upper straight-rotation surface 811 and the core lower straight-rotation surface 812 is β, and in order to ensure the bending rigidity of the cutter body 1 and to improve the chip discharge capability of the specific shape in the core recess surface 81, it is necessary to satisfy: β is not less than 10 ° and not more than 40 °, and in the present embodiment, β is not less than 20 °.
In this embodiment, a core angle arc surface 815 is provided between the core bottom straight side surface 8131 and the corresponding core upper straight rotation surface 811 or the core lower straight rotation surface 812, and in a plane orthogonal to the rotation central axis 11 and intersecting with the core concave surface 81, a tangential distance between the core angle arc surface 815 and the core bottom straight top surface 8132 is H, so as to optimize a stress distribution at an intersection of the core upper straight rotation surface 811, the core lower straight rotation surface 812 and the core bottom straight side surface 8131, and avoid fatigue fracture of the cutter body 1, which should be satisfied: h is not less than 0.02D and not more than 0.1D, and in the embodiment, H is 0.25D.
In this embodiment, the passivation surfaces 9 are disposed between the straight upper surface 811, the straight lower surface 812 and the circumferential surface 6 of the cutter body, so as to prevent the circumferential surface 6 of the cutter body from collapsing.
Fig. 4 to 6 show a second embodiment of the split drilling tool of the invention, which differs from the first embodiment in that: the cutting insert 2 includes a core cutting insert 21 located on the rotation center axis 11 and a peripheral cutting insert 22 located on the cutter body peripheral surface 6, the recess surface 8 of the chip pocket 7 corresponding to the core cutting insert 21 is a core recess surface 81, the core recess surface 81 includes a core upper straight-rotation surface 811, a core lower straight-rotation surface 812 and a core recess bottom surface 813, the core recess bottom surface 813 is provided between the core upper straight-rotation surface 811 and the core lower straight-rotation surface 812, the recess surface 8 of the chip pocket 7 corresponding to the peripheral cutting insert 22 is a peripheral recess surface 82, the peripheral recess surface 82 includes a peripheral upper straight-rotation surface 821, a peripheral lower straight-rotation surface 822 and a peripheral recess bottom surface 823, and the peripheral recess bottom surface is provided between the peripheral upper straight-rotation surface 821 and the peripheral lower straight-rotation surface 822.
In this embodiment, the circular recessed bottom surface 823 includes two circular straight side surfaces 8231 and a circular straight top surface 8232 located between the two circular straight side surfaces 8231, and in a plane orthogonal to the rotation central axis 11 and intersecting with the circular recessed surface 82, an included angle between the two circular straight side surfaces 8231 is α', in order to avoid chip contact between the circular upper straight rotation surface 821, the circular lower straight rotation surface 822 and the circular straight side surface 8231, and improve the chip removal effect of the circular recessed surface 82, it should be satisfied: 100 ° ≦ α '≦ 140 °, in this embodiment, α' ≦ 120 °.
In this embodiment, the diameter of the drilling tool is D, and the width of the peripheral straight top surface 8232 is W' in a plane orthogonal to the rotation center axis 11 and intersecting the peripheral recessed surface 82, so as to control the size of the chip contact area between the peripheral upper straight surface 821, the peripheral lower straight surface 822, and the peripheral straight side surface 8231, and satisfy: 0.01D ≦ W' 0.15D, in this example W ═ 0.12D.
In this embodiment, the minimum distance between the center of the peripheral straight top surface 8232 and the peripheral surface 6 of the cutter body is L', in order to ensure the discharge capability of the chips with specific shapes in the peripheral concave surface 82, the following requirements should be satisfied: l' is more than or equal to 0.1D and less than or equal to 0.2D.
In this embodiment, the middle of the circumferential concave bottom surface 823 is provided with a circumferential concave arc surface 824, and the circumferential concave arc surface 824 is R' and should satisfy: r' is more than or equal to 0.07D and less than or equal to 0.15D.
In the present embodiment, in the plane orthogonal to the rotation center axis 11 and intersecting the core recessed surface 81, the angle between the core upper straight-rotation surface 811 and the core lower straight-rotation surface 812 is β, and in the plane orthogonal to the rotation center axis 11 and intersecting the circumferential recessed surface 82, the angle between the circumferential upper straight-rotation surface 821 and the circumferential lower straight-rotation surface 822 is β', and in order to ensure the bending rigidity of the cutter body 1 and improve the chip discharge ability of the specific shape in the core recessed surface 81 and the circumferential recessed surface 82, it is necessary to satisfy: β is 10 ° to 40 °, β' - β is 10 ° to 40 °, β is 20 ° to 60 ° in this embodiment.
In this embodiment, a core angle arc surface 815 is disposed between the core bottom straight side surface 8131 and the corresponding core upper straight rotation surface 811 or the core lower straight rotation surface 812, a tangent distance between the core angle arc surface 815 and the core top straight side surface 8132 is H in a plane orthogonal to the rotation central axis 11 and intersecting the core concave surface 81, a peripheral angle arc surface 825 is disposed between the peripheral straight side surface 8231 and the corresponding peripheral upper straight rotation surface 821 or the peripheral lower straight rotation surface 822, and a tangent distance between the peripheral angle arc surface 825 and the peripheral straight top surface 8232 is H' in a plane orthogonal to the rotation central axis 11 and intersecting the peripheral concave surface 82, so as to optimize a stress distribution at an intersection of the core upper straight rotation surface 811, the core lower straight rotation surface 812 and the core bottom straight side surface 8131 and an intersection of the peripheral upper straight rotation surface 821, the peripheral lower straight rotation surface 822 and the peripheral bottom straight side surface 8231, and avoid fatigue fracture of the cutter body 1, and satisfy: 0.02 D.ltoreq.H.ltoreq.0.1D, 0.02 D.ltoreq.H '-H.ltoreq.0.1D, in this example, H.ltoreq.0.25D, and H' is 0.3D.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention, unless the technical essence of the present invention departs from the content of the technical solution of the present invention.
Claims (16)
1. The utility model provides a drilling tool, includes cutter body (1) and cutting blade (2), cutter body (1) includes clamping handle portion (4), cutting end portion (3) and is located the global (6) of cutter body between clamping handle portion (4), cutting end portion (3), clamping handle portion (4), the global (6) of cutter body all about the rotation center axis (11) symmetry of cutting cutter body (2), chip container groove (7) have been seted up on the global (6) of cutter body, be equipped with on cutting end portion (3) with communicating sword groove (5) of chip container groove (7), cutting blade (2) are fixed install in sword groove (5), its characterized in that: the chip flutes (7) comprise concave surfaces (8), and the bottom surfaces of the concave surfaces (8) are outwards in an arch structure.
2. Drilling tool according to claim 1, characterized in that: the cutting insert (2) comprises a core cutting insert (21) located on a rotation center shaft (11), wherein a recess surface (8) of a chip pocket (7) corresponding to the core cutting insert (21) is a core recess surface (81), the core recess surface (81) comprises a core upper straight-rotation surface (811), a core lower straight-rotation surface (812) and a core recess bottom surface (813), and the core recess bottom surface (813) is arranged between the core upper straight-rotation surface (811) and the core lower straight-rotation surface (812).
3. Drilling tool according to claim 2, characterized in that: the core recessed bottom surface (813) comprises two core bottom straight side surfaces (8131) and a core bottom straight top surface (8132) located between the two core bottom straight side surfaces (8131), and the included angle of the two core bottom straight side surfaces (8131) in a plane which is orthogonal to the rotation central axis (11) and intersects with the core recessed surface (81) is alpha, and the following conditions are met: alpha is more than or equal to 120 degrees and less than or equal to 160 degrees.
4. Drilling tool according to claim 3, characterized in that: the drilling tool has a diameter D and a core bottom straight top surface (8132) having a width W in a plane orthogonal to the central axis of rotation (11) and intersecting the core recessed surface (81) such that: w is more than or equal to 0.1D and less than or equal to 0.2D.
5. Drilling tool according to claim 4, characterized in that: the minimum distance between the center of the straight top surface (8132) at the bottom of the core and the circumferential surface (6) of the cutter body is L and meets the following requirements: l is more than or equal to 0.05D and less than or equal to 0.1D.
6. Drilling tool according to claim 4, characterized in that: the straight top surface (8132) middle part at the bottom of the core is equipped with concave core arc surface (814), concave core arc surface (814) radius is R, should satisfy: r is more than or equal to 0.07D and less than or equal to 0.15D.
7. Drilling tool according to claim 4, characterized in that: in a plane orthogonal to the rotation center axis (11) and intersecting the core concave surface (81), an included angle between the core upper straight-rotation surface (811) and the core lower straight-rotation surface (812) is beta, and the following conditions are satisfied: beta is more than or equal to 10 degrees and less than or equal to 40 degrees.
8. Drilling tool according to claim 4, characterized in that: a core angle arc surface (815) is arranged between the core bottom straight side surface (8131) and the corresponding core upper straight rotary surface (811) or the core lower straight rotary surface (812), and in a plane which is orthogonal to the rotation central axis (11) and is intersected with the core concave surface (81), the tangent distance between the core angle arc surface (815) and the core bottom straight top surface (8132) is H, and the following requirements are met: h is more than or equal to 0.02D and less than or equal to 0.1D.
9. Drilling tool according to any one of claims 2 to 8, wherein: a passivation surface (9) is arranged between the upper straight rotating surface (811) of the core, the lower straight rotating surface (812) of the core and the circumferential surface (6) of the cutter body.
10. Drilling tool according to claim 1, characterized in that: the cutting blade (2) comprises a core cutting blade (21) positioned on the rotating central shaft (11) and a peripheral cutting blade (22) positioned on the peripheral surface (6) of the cutter body, the recess surface (8) of the chip pocket (7) corresponding to the core cutting insert (21) is a core recess surface (81), the core recessed surface (81) comprises a core upper straight-turning surface (811), a core lower straight-turning surface (812) and a core recessed bottom surface (813), the core recessed bottom surface (813) is disposed between the core upper straight-turn surface (811) and the core lower straight-turn surface (812), the recess surface (8) of the chip pocket (7) corresponding to the peripheral cutting insert (22) is a peripheral recess surface (82), the peripheral concave surface (82) comprises a peripheral upper straight rotating surface (821), a peripheral lower straight rotating surface (822) and a peripheral concave bottom surface (823), the peripheral concave bottom surface (823) is arranged between the peripheral upper straight-rotating surface (821) and the peripheral lower straight-rotating surface (822).
11. Drilling tool according to claim 10, characterized in that: the peripheral concave bottom surface (823) comprises two peripheral straight side surfaces (8231) and a peripheral straight top surface (8232) positioned between the two peripheral straight side surfaces (8231), and in a plane which is orthogonal to the central rotation axis (11) and intersects with the peripheral concave surface (82), the included angle of the two peripheral straight side surfaces (8231) is alpha', and the following conditions are met: alpha' is more than or equal to 100 degrees and less than or equal to 140 degrees.
12. The drilling tool as set forth in claim 10, wherein: the drilling tool has a diameter D, and the peripheral straight top surface (8232) has a width W' in a plane orthogonal to the central axis of rotation (11) and intersecting the peripheral recessed surface (82) such that: w' is more than or equal to 0.01D and less than or equal to 0.15D.
13. Drilling tool according to claim 12, characterized in that: the minimum distance between the center of the peripheral straight top surface (8232) and the peripheral surface (6) of the cutter body is L', and the minimum distance satisfies the following conditions: l' is more than or equal to 0.1D and less than or equal to 0.2D.
14. Drilling tool according to claim 12 or 13, characterized in that: the middle of the circumference concave bottom surface (823) is provided with a circumference concave arc surface (824), and the circumference concave arc surface (824) is R', and the following requirements are met: r' is more than or equal to 0.07D and less than or equal to 0.15D.
15. Drilling tool according to claim 10 or 11, characterized in that: an angle between the core upper straight-rotation surface (811) and the core lower straight-rotation surface (812) is β in a plane orthogonal to the rotation center axis (11) and intersecting the core concave surface (81), and an angle between the peripheral upper straight-rotation surface (821) and the peripheral lower straight-rotation surface (822) is β' in a plane orthogonal to the rotation center axis (11) and intersecting the peripheral concave surface (82), and the angles are satisfied: beta is more than or equal to 10 degrees and less than or equal to 40 degrees, and beta' -beta is more than or equal to 10 degrees and less than or equal to 40 degrees.
16. Drilling tool according to claim 12 or 13, characterized in that: a core angle arc surface (815) is arranged between the core bottom straight side surface (8131) and the corresponding core upper straight rotating surface (811) or the core lower straight rotating surface (812), the tangent distance between the core angle arc surface (815) and the core top straight side surface (8132) is H in a plane which is orthogonal to the rotation central axis (11) and intersects with the core concave surface (81), a peripheral angle arc surface (825) is arranged between the peripheral straight side surface (8231) and the corresponding peripheral upper straight rotating surface (821) or the peripheral lower straight rotating surface (822), and the tangent distance between the peripheral angle arc surface (825) and the peripheral straight top surface (8232) is H' in a plane which is orthogonal to the rotation central axis (11) and intersects with the peripheral concave surface (82), so that: h is more than or equal to 0.02D and less than or equal to 0.1D, and H' -H is more than or equal to 0.02D and less than or equal to 0.1D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210637847.5A CN114789272B (en) | 2022-06-07 | 2022-06-07 | Drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210637847.5A CN114789272B (en) | 2022-06-07 | 2022-06-07 | Drilling tool |
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| CN114789272A true CN114789272A (en) | 2022-07-26 |
| CN114789272B CN114789272B (en) | 2023-12-22 |
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| CN202210637847.5A Active CN114789272B (en) | 2022-06-07 | 2022-06-07 | Drilling tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Publication date |
|---|---|
| CN114789272B (en) | 2023-12-22 |
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