CN115673387A - Micro drill bit - Google Patents
Micro drill bit Download PDFInfo
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- CN115673387A CN115673387A CN202211264831.0A CN202211264831A CN115673387A CN 115673387 A CN115673387 A CN 115673387A CN 202211264831 A CN202211264831 A CN 202211264831A CN 115673387 A CN115673387 A CN 115673387A
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- edge
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- cutting edge
- edges
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- 230000000694 effects Effects 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The utility model provides a micro drill, includes the drill point portion, drill point portion includes two sections short chisel edges that centrosymmetric set up, is located the one end that short chisel edge kept away from each other sets up at least one section gradient and is different from the first cutting edge of short chisel edge is provided with the multistage first cutting edge, the multistage gradient between the first cutting edge is inequality. This micro drill changes the chisel edge of traditional drill bit into the different short chisel edge of gradient and at least one section first cutting edge to reduce the length of traditional chisel edge, improve drilling centering ability, increase little drill core thickness by first cutting edge simultaneously, strengthen the intensity of boring a little when promoting little centering effect.
Description
Technical Field
The invention relates to the field of drill bits, in particular to a micro drill bit.
Background
Drill bits with a diameter of less than 3.175mm are commonly referred to as micro-drills, micro-drills for short. In the development and design of the micro drill, the material, the front end structure, the drill tip, the core thickness and the like are parameters which can have great influence on the performance of the micro drill. For example, in the case of diamond micro-drilling, the diameter of the diamond micro-drilling is substantially less than 1mm, the core thickness is large, the centering effect is poor, the core thickness is small, the strength of the drill bit is reduced, and the drill bit is easily broken. In addition, although diamond has high hardness, it has poor toughness, and when the cutting force is large, the cutting edge is easily chipped. Therefore, there is a need for an improved structure of the drilling tip portion of the drill to reduce the problem of chipping.
Disclosure of Invention
The invention aims to provide a micro drill bit, which changes the chisel edge of a traditional drill bit into a short chisel edge with different gradients and at least one section of first cutting edge so as to reduce the length of the traditional chisel edge and improve the centering capability of a drill hole, and meanwhile, the first cutting edge increases the thickness of a micro drill core, so that the centering effect of the micro drill is improved and the strength of the micro drill is enhanced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a micro drill comprises a drill tip part, wherein the drill tip part comprises two short chisel edges which are arranged in a centrosymmetric manner, at least one first cutting edge with gradient different from that of the short chisel edge is arranged at one end, away from each other, of the short chisel edges, a plurality of sections of the first cutting edges are arranged, and the gradient among the plurality of sections of the first cutting edges is different; the short chisel edge has a smaller length than the traditional chisel edge, so that the centering effect of the drill hole is improved, and meanwhile, the core thickness is increased by means of the first cutting edge, and the strength of the micro drill is enhanced;
correspondingly, the included angle between the two short chisel edges is 140-170 degrees; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as port collapse and trace arrangement are easily caused;
correspondingly, the included angle between the two corresponding sections of the first cutting edges is 140-170 degrees, and the included angle between the two sections of the first cutting edges is smaller than or equal to the included angle between the two sections of the short chisel edges; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as port breakage, line mark and the like are easy to generate;
correspondingly, one or more sections of cutting surfaces corresponding to the first cutting edges are first edge surfaces, one section of the first cutting edge corresponds to one first edge surface, a plurality of sections of the first cutting edges correspond to a plurality of first edge surfaces which are positioned on different planes, and the intersection edges of the first edge surfaces and the spiral chip grooves form second cutting edges; the length of the edge line is increased through the second cutting edge, the local stress is reduced, and the problem of edge cracking is solved;
correspondingly, the included angle between the first blade surface and the spiral chip groove ranges from 50 degrees to 70 degrees; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as port collapse and trace arrangement are easily caused;
correspondingly, the space included angle between the two corresponding sections of the second cutting edges is 90-150 degrees, and the space included angle between the two sections of the second cutting edges is smaller than or equal to the included angle between the two sections of the first cutting edges; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as port breakage, line mark and the like are easy to generate;
correspondingly, at least one section of third cutting edge with gradient different from that of the second cutting edge is arranged at one end, far away from the second cutting edge, of the second cutting edge, and a plurality of sections of the third cutting edge are arranged, and the gradients among the plurality of sections of the third cutting edge are different; the multi-section cutting edge is adopted to replace the traditional integrated cutting edge, on one hand, the length of an edge line can be further increased, the local stress is reduced, and the problem of edge cracking is solved, on the other hand, the cutting amount and the cutting pressure of each section of cutting edge can be adjusted according to the length and the angle of each section of cutting edge, and the problem of edge cracking is further solved;
correspondingly, the space included angle of the two corresponding sections of the third cutting edges is 50-150 degrees, and the space included angle of the two sections of the third cutting edges is smaller than or equal to the space included angle between the two sections of the second cutting edges; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as port breakage, line mark and the like are easy to generate;
correspondingly, a third edge surface is formed by intersecting the spiral chip groove to form a third cutting edge, and the included angle between the third edge surface and the spiral chip groove is 30-60 degrees; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as port collapse and trace arrangement are easily caused;
correspondingly, a second edge surface is intersected with the first edge surface to form the first cutting edge, and the included angle between the first edge surface and the second edge surface is 90-130 degrees; the included angle is too large, so that the sharpness of the drill point is poor, and the included angle is too small, so that the strength of the drill point is low, and phenomena such as opening collapse, line marks and the like are easily caused.
The beneficial effects of the invention are as follows:
on one hand, the length of the traditional chisel edge is reduced, the centering capability of the drill hole is improved, meanwhile, the thickness of the micro drill core is increased by one or more sections of first cutting edges, the contradiction of large core thickness, poor centering, small core thickness and low strength of the traditional drill is coordinated, and the strength of the micro drill is enhanced while the centering effect of the micro drill is improved;
on the other hand, the multi-section cutting edge (comprising the first cutting edge, the second cutting edge and the third cutting edge) is adopted to replace the traditional integrated cutting edge, the length of an edge line is increased, the local stress is reduced, the problem of edge cracking is solved, the cutting amount and the cutting pressure of each section of cutting edge can be adjusted according to the design of the length and the angle of each section of cutting edge, and the problem of edge cracking is further solved.
Drawings
FIG. 1 is a perspective view of a drill tip of a micro drill according to an embodiment of the present invention;
FIG. 2 is a schematic representation of a cutting face on the end face of a drill bit according to an embodiment of the present invention;
FIG. 3 is a schematic representation of the cutting edge corresponding to the facet distribution of FIG. 2;
FIG. 4 shows an included angle θ between two short chisel edges according to an embodiment of the present invention 1 A schematic diagram of (a);
FIG. 5 shows an included angle θ between two first cutting edges according to an embodiment of the present invention 2 A schematic diagram of (a);
FIG. 6 shows an included angle θ between two second cutting edges according to an embodiment of the present invention 3 A schematic diagram of (a);
FIG. 7 shows the included angle θ between two third cutting edges according to an embodiment of the present invention 4 A schematic diagram of (a);
in the figure:
11. a first edge surface a; 12. a second blade face a; 13. a third edge surface a; 14. a fourth cutting edge surface a;
21. a first edge surface b; 22. a second edge surface b; 23. a third facet b; 24. a fourth cutting edge face b;
3. a short chisel edge; 4. a first cutting edge; 5. a second cutting edge; 6. a third cutting edge; 7. spiral chip grooves.
Detailed Description
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
In one embodiment of the present invention, as shown in fig. 1, the micro drill includes a drill tip portion and a helical flute provided on a circumferential side of the drill. The drill point comprises two short chisel edges 3 which are arranged in a central symmetry manner, at least one first cutting edge 4 with a gradient different from that of the short chisel edge 3 is arranged at one end, away from the short chisel edge 3, of the short chisel edge 3 (the gradient can be understood as a slope or a gradient and directly influences the size of an included angle, the lower end is the same), the multiple first cutting edges 4 are arranged, the gradients among the multiple first cutting edges 4 are different, the cutting face corresponding to one or more first cutting edges 4 is a first cutting face, one first cutting edge 4 corresponds to one first cutting face, the multiple first cutting edges 4 correspond to multiple first cutting faces on different planes (because the gradients of the multiple first cutting edges 4 are different, the first cutting faces corresponding to the multiple first cutting edges 4 are not on the same plane), the short cutting edge 3 is formed by intersecting with the first cutting faces and is a fourth cutting face, the first cutting edge 3 is formed by intersecting with the first cutting faces and is a second cutting face, the second cutting edge 5 is formed by intersecting with the first cutting face, the first cutting edge 6, the third cutting edge 6 is arranged at least one end, away from the first cutting edge 5, and the third cutting edge 6 are different from that the gradients of the first cutting edge 6.
In the present embodiment, for simplicity of description, the first cutting edge 4 and the third cutting edge 6 are only provided with one segment, and taking the diamond micro drill as an example, the drill tip includes two cutting groups which are centrosymmetric, and two spiral chip flutes 7 are formed corresponding to the two cutting groups.
As shown in fig. 2, each cutting group includes a first edge surface, a second edge surface, a third edge surface and a fourth edge surface, in order to distinguish the edge surfaces of the two cutting groups, the edge surfaces of one cutting group are respectively referred to as a first edge surface a11, a second edge surface a12, a third edge surface a13 and a fourth edge surface a14, and the edge surfaces of the other cutting group corresponding to the edge surfaces in one-to-one correspondence are respectively referred to as a first edge surface b21, a second edge surface b22, a third edge surface b23 and a fourth edge surface b24.
As shown in fig. 2 and 3, the intersection of the first edge surface of one group and the fourth edge surface of the other group is the intersection edge of the first edge surface a11 and the fourth edge surface b24 and the intersection edge of the first edge surface b21 and the fourth edge surface a14, which are the short chisel edges 3, and as shown in fig. 4, the included angle θ between the two short chisel edges 3 1 Is 140-170 degrees. Continuing with fig. 2 and 3, the intersection of the first facet in one set and the second facet in the other set, i.e. the intersection edge of the first facet a11 and the second facet b22 and the intersection edge of the first facet b21 and the second facet a12, which are the first cutting edge 4, has a different gradient from the first cutting edge 4 to the short chisel edge 3, as shown in fig. 5, the angle θ between the two first cutting edges 4 2 140 to 170 deg., the first edge surface and the second edge surface have an included angle of 90 to 130 deg., and more particularly, the included angle between the first edge surface a11 and the second edge surface b22 and the included angle between the first edge surface b21 and the second edge surface a12 are 90 to 130 deg.. As further shown in fig. 2 and 3, the intersection edge of the first edge surface a11 and the spiral flute 7 and the intersection edge of the first edge surface b21 and the spiral flute 7 are the second cutting edges 5, and as shown in fig. 6, the spatial included angle θ between the two second cutting edges 5 3 Is 90-150 degrees, the space included angle is the included angle formed by projecting the two cutting edges on the same plane, and the included angle between the first edge surface and the spiral chip groove is the same at the lower partIn the range of 50 to 70 deg., and more specifically, the included angle between the first edge surface a11 and the helical flute 7 and the included angle between the first edge surface b21 and the helical flute 7 are in the range of 50 to 70 deg.. As further shown in fig. 2 and 3, the intersection edge of the third land a13 and the spiral flute 7 and the intersection edge of the third land b23 and the spiral flute 7 are the third cutting edges 6, and as shown in fig. 7, the spatial included angle θ between the two third cutting edges 6 4 50-150 degrees, the included angle between the third edge surface and the spiral chip groove is 30-60 degrees, and more specifically, the included angle between the third edge surface a13 and the spiral chip groove 7 and the included angle between the third edge surface b23 and the spiral chip groove 7 are 30-60 degrees.
Through the length that reduces short chisel edge 3, improve drilling centering ability, the core that increases little brill through first cutting edge 4 is thick, can realize the intensity that strengthens little brill when promoting little brill centering effect, replace traditional integral type cutting edge with the multistage formula cutting edge simultaneously, increase sword line length on the one hand, reduce local atress, improve the blade and collapse the problem, on the other hand, can be according to the design to every section cutting edge length, angle and adjust the cutting output and the cutting pressure of every section cutting edge. For example, the chipping problem at the third cutting edge 6 is severe, the cutting amount of the third cutting edge 6 can be reduced by extending the length of the second cutting edge 5, or the cutting pressure of the third cutting edge 6 can be reduced by reducing the spatial included angle between two sections of the third cutting edge 6, and both adjustment manners can improve the chipping problem of the third cutting edge 6.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a micro drill, includes the drill tip portion, its characterized in that, the drill tip portion includes two sections short chisel edges that centrosymmetric set up, is located the one end that short chisel edge kept away from each other sets up one section at least gradient and is different from the first cutting edge of short chisel edge is provided with the multistage first cutting edge, the multistage gradient between the first cutting edge is inequality.
2. The micro-drill according to claim 1, wherein the angle between the two short chisel edges is 140-170 °.
3. The micro drill according to claim 1, wherein the included angle between the two corresponding first cutting edges is 140 to 170 °, and the included angle between the two first cutting edges is smaller than or equal to the included angle between the two short chisel edges.
4. The micro-drill of claim 1, wherein one or more of the first cutting edges corresponds to a first land, one of the first cutting edges corresponds to one of the first lands, and a plurality of the first cutting edges correspond to a plurality of the first lands lying in different planes, wherein the intersection of the first lands with the helical flutes forms a second cutting edge.
5. The micro-drill of claim 4, wherein the first land and the helical flutes are angled at an angle in the range of 50 ° to 70 °.
6. The micro drill according to claim 4, wherein the spatial angle between two corresponding segments of the second cutting edges is 90-150 °, and the spatial angle between two segments of the second cutting edges is smaller than or equal to the spatial angle between two segments of the first cutting edges.
7. The microbit according to claim 4, characterized in that at least one section of third cutting edge with a gradient different from that of the second cutting edge is disposed at the end of the second cutting edge away from each other, and a plurality of sections of the third cutting edge are disposed, wherein the gradients of the plurality of sections of the third cutting edge are different.
8. The micro drill bit as claimed in claim 7, wherein the spatial angle of the two corresponding segments of the third cutting edges is 50-150 °, and the spatial angle of the two segments of the third cutting edges is smaller than or equal to the spatial angle between the two segments of the second cutting edges.
9. The micro-drill of claim 7, wherein a third land intersecting said helical flutes to form said third cutting edges is at an angle of 30 ° to 60 °.
10. The microbit of claim 4, wherein the intersection with the first facet to form the first cutting edge is a second facet, the included angle between the first facet and the second facet being between 90 ° and 130 °.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211264831.0A CN115673387A (en) | 2022-10-17 | 2022-10-17 | Micro drill bit |
| PCT/CN2023/125080 WO2024083136A1 (en) | 2022-10-17 | 2023-10-17 | Micro drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211264831.0A CN115673387A (en) | 2022-10-17 | 2022-10-17 | Micro drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115673387A true CN115673387A (en) | 2023-02-03 |
Family
ID=85066372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211264831.0A Pending CN115673387A (en) | 2022-10-17 | 2022-10-17 | Micro drill bit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115673387A (en) |
| WO (1) | WO2024083136A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024083136A1 (en) * | 2022-10-17 | 2024-04-25 | 嘉兴沃尔德金刚石工具有限公司 | Micro drill bit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10204105A1 (en) * | 2002-02-01 | 2003-08-28 | Kennametal Inc | Rotary cutting tool |
| CN102357665A (en) * | 2011-10-08 | 2012-02-22 | 深圳市金洲精工科技股份有限公司 | Microbit and processing method thereof |
| CN106424832B (en) * | 2016-11-11 | 2019-02-26 | 成都锋宜精密工具制造有限公司 | A kind of band makes the drill bit apex point of heart function by oneself |
| CN108057918B (en) * | 2017-12-29 | 2024-05-24 | 广东工业大学 | PCB miniature drill bit |
| CN115673387A (en) * | 2022-10-17 | 2023-02-03 | 嘉兴沃尔德金刚石工具有限公司 | Micro drill bit |
-
2022
- 2022-10-17 CN CN202211264831.0A patent/CN115673387A/en active Pending
-
2023
- 2023-10-17 WO PCT/CN2023/125080 patent/WO2024083136A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024083136A1 (en) * | 2022-10-17 | 2024-04-25 | 嘉兴沃尔德金刚石工具有限公司 | Micro drill bit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024083136A1 (en) | 2024-04-25 |
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