CN208895249U - A kind of self-centering drill bit - Google Patents
A kind of self-centering drill bit Download PDFInfo
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- CN208895249U CN208895249U CN201821681049.8U CN201821681049U CN208895249U CN 208895249 U CN208895249 U CN 208895249U CN 201821681049 U CN201821681049 U CN 201821681049U CN 208895249 U CN208895249 U CN 208895249U
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Abstract
The utility model relates to a kind of self-centering drill bits, including along shank and being arranged in the head of shank lower end, the head includes at least two cutting portions being centrosymmetric relative to the rotation axis of shank, described cutting portion one end connects shank, the other end is the cutting edge for cutting material, plane on the inside of the cutting portion to extend along the rotation axis of shank, outside is Cylinder Surface, the guide curve surface for cutting clast to be discharged is equipped between the plane and Cylinder Surface, the cutting edge is downward opening curve-like, the cutting edge of each cutting portion mutually crosses to be formed for contacting the centering sword to centering with workpiece first in processing close to one end of center position, the other end is in the upside of the centering sword.The utility model centering effect in use is good, impulse- free robustness generates, accurate boring capacity with higher for thin-walled material, in numerically-controlled machine tool can a drilling via formations, it is high in machining efficiency.
Description
Technical field
The utility model relates to drill field more particularly to a kind of self-centering drill bits.
Background technique
In the processing of metalwork, it is often necessary to original metal material carry out different modes processing, such as milling,
In the processing of drilling etc., the tool generallyd use is numerically-controlled machine tool, specifically when drilling, the drilling processing especially on cambered surface material
When, the general center position first in hole bores a guide holes in advance, carries out bore operation, again then to ensure the accurate of hole location
Degree, because of running at high speed for drill bit, contacts in a flash if disposably carrying out drilling completion with product surface, because of centrifugal force or
Person's inertia stress drill bit can bore bias, and error is larger, and the hole precision drilled out can not reach requirement；Simultaneously because some materials are such as
The materials such as aluminium itself are softer, and boring procedure clast knife easy to stick or material extrusion cause hole burr larger, scrappage is higher.
Application publication number is that the Chinese patent of CN103157834A discloses a kind of low chisel edge drill bit, the low chisel edge drill bit packet
Shank and head are included, shank is cylindrical body, and head is the coaxial clyinder of one with shank coaxial line, and head includes two main cuttings
The chisel edge of 140 ° of the convexity being arranged between sword and two main cutting edges is lower than point of a knife 0.5-1mm in axis direction chisel edge cusp.It should
The blade tip at bit central position is slightly below the point of a knife of the main cutting edge of two sides, so that main cutting edge is initially cut material in drilling
Interior, chisel edge is then felt relieved, although centering ability is preferable, effectively reduces the problems such as burr, is felt relieved more when the drill bit drills
Delay, will cause a degree of centering error early period, is not suitable for the drill precise holes of thin-walled material, therefore, it is necessary to develop
Cope with the drill bit of relevant issues.
Utility model content
The utility model provides a kind of self-centering drill bit, to solve to be not suitable for the drill precise holes of thin-walled material in the prior art
The problem of.
A kind of self-centering drill bit of the utility model adopts the following technical scheme that
Including the shank vertically extended and the head of shank lower end is arranged in a kind of self-centering drill bit, described
Head includes at least two cutting portions being centrosymmetric relative to the rotation axis of shank, described cutting portion one end connection handle
Portion, the other end are the cutting edge for cutting material, are the plane extended along the rotation axis of shank on the inside of the cutting portion, outer
Side is Cylinder Surface, and the guide curve surface for cutting clast to be discharged, the cutting edge are equipped between the plane and Cylinder Surface
Cutting edge for downward opening curve-like, each cutting portion mutually crosses to be formed for adding close to one end of center position
Working hour contacts the upside for being in the centering sword to centering sword, the other end of centering with workpiece first.
The cutting edge is the curve-like being made of one section of straight line and one section of circular arc, wherein rotation of the straight line close to shank
Shaft axis simultaneously intersects with it.
The central axes of the straight line and shank have 22.5 ° -25 ° of an angle, and preferably 24.425 °.
The radius of the circular arc is 0.2-0.3 times, preferably 0.25 times of the diameter of the cutting portion Cylinder Surface.
The angle of the rotation axis of straight line and shank that the both ends endpoint of the cutting edge is constituted is 55 ° -70 °, preferably
59°。
There are two the cutting portions.
The beneficial effects of the utility model are:
During a kind of cutting portion of the head setting of self-centering drill bit of the utility model relative to the rotation axis of shank is in
The heart is symmetrical, and the cutting edge of each cutting portion is curve-like and mutually crosses to be formed for processing close to one end of center position
Shi Shouxian contacts the upside for being in the centering sword to centering sword, the other end of centering, therefore, cutting edge one end structure with workpiece
The cutting point for being mainly used for cutting material is constituted at centering point, the other end with centering ability, and is on the inside of cutting portion
Plane, outside are Cylinder Surface, and planar structure strengthens cutting edge, are equipped between plane and Cylinder Surface broken for cutting to be discharged
The guide curve surface of bits, scar caused by which prevents while meeting the requirement of smooth chip removal because of clast delay device to hole
Or burr, also there is booster action to cutting edge, specifically when drilling, centering sword is first advanced into material and feels relieved, and then cuts
The cutting point for cutting sword cuts material, and centering effect in use is good, impulse- free robustness generates, and has for thin-walled material higher
Accurate boring capacity, in numerically-controlled machine tool can a drilling via formations, it is high in machining efficiency.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the main view of the specific embodiment of the self-centering drill bit of the utility model；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is the bottom view of Fig. 1；
Fig. 4 is all angles schematic diagram on head in Fig. 2；
Fig. 5 is the stereoscopic schematic diagram of the self-centering drill bit of the utility model；
Fig. 6 is the structural schematic diagram of the self-centering drill bit another embodiment of the utility model；
In figure: 1, shank；2, head；21, cutting edge；22, technical face；23, guide curve surface；24, plane；25, cylinder is bent
Face；3, cylindrical handle.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
A kind of embodiment of the self-centering drill bit of the utility model, as shown in Figures 1 to 6, a kind of self-centering drill bit, including
The shank 1 that vertically extends and the head 2 that 1 lower end of shank is arranged in, shank 1 are that lower end has cone structure
Cylinder, the head 2 include two cutting portions being centrosymmetric relative to the rotation axis of shank 1, described cutting portion one end
Shank 1, the other end are connected as the cutting edge 21 for cutting material, is prolonged on the inside of the cutting portion for the rotation axis along shank 1
The plane 24 stretched, outside are Cylinder Surface 25, are equipped between the plane 24 and Cylinder Surface 25 and cut clast for be discharged
Guide curve surface 23, the cutting edge 21 are downward opening curve-like, and the cutting edge 21 of each cutting portion is close to center position
One end mutually cross to be formed for contact the centering sword to centering, the other end with workpiece first in processing in described fixed
The upside of heart sword.There is the technical face 22 for processing cutting edge 21, while the work between guide curve surface 23 and Cylinder Surface 25
Skill face 22 also has the ability of enhancing chip removal smooth degree.
In the present embodiment, cutting edge 21 is the curve-like being made of one section of straight line and one section of circular arc, wherein the straight line
The rotation axis of close shank 1 simultaneously intersects with it.
In the present embodiment, the angle of the central axes of the straight line and shank 1 is 24.425 °, i.e. two cutting edges 21
Included angle B between straight line is 48.85 °, and the radius D of the circular arc is 0.25 times of the diameter E of the cutting portion Cylinder Surface 25.
In the present embodiment, the angle of the straight line and the rotation axis of shank 1 of the both ends endpoint composition of cutting edge 21 is
59 °, i.e., the included angle A between straight line that the both ends endpoint of two cutting edges 21 is constituted is 118 °.
When specifically used, the apex point of cutting edge 21 is first advanced into material and feels relieved, and the cutting point of subsequent cutting edge 21 is right
Material is cut, and 21 one end of cutting edge constitutes the point of the centering with centering ability, other end composition is mainly used for cutting material
The cutting point of material, and be plane 24 on the inside of cutting portion, outside is Cylinder Surface 25,24 structural strengthening of plane cutting edge 21,
The guide curve surface 23 for cutting clast to be discharged is equipped between plane 24 and Cylinder Surface 25, which is meeting smooth chip removal
Requirement while prevent because clast be detained device to hole caused by scar or burr, to cutting edge 21 also have booster action,
Centering effect is good in use, impulse- free robustness generates, and accurate boring capacity with higher for thin-walled material can in numerically-controlled machine tool
Drilling via formations, it is high in machining efficiency.
In other embodiments, shank can be columned cylindrical handle 3, as shown in fig. 6,2 structure of head and above-mentioned head
2 structure of portion is identical.
In other embodiments, cutting portion is settable multiple.
In other embodiments, the central axes of straight line and shank have the angle of any one angle in 22.5 ° -25 °；Circle
The radius of arc is 0.2-0.3 times of the diameter of the cutting portion Cylinder Surface；The straight line and handle that the both ends endpoint of cutting edge is constituted
The angle of the rotation axis in portion is the angle of any one in 55 ° -70 °.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (9)
1. a kind of self-centering drill bit, including the shank vertically extended and the head of shank lower end, feature be set
Be: the head includes at least two cutting portions being centrosymmetric relative to the rotation axis of shank, the cutting portion one
End connects shank, the other end as the cutting edge for cutting material, extends on the inside of the cutting portion along the rotation axis of shank
Plane, outside be Cylinder Surface, between the plane and Cylinder Surface be equipped with for be discharged cut clast guide curve surface, institute
Stating cutting edge is downward opening curve-like, and the cutting edge of each cutting portion mutually crosses to be formed close to one end of center position
For contacting the upside for being in the centering sword to centering sword, the other end of centering with workpiece first in processing.
2. a kind of self-centering drill bit according to claim 1, it is characterised in that: the cutting edge is by one section of straight line and one
Section circular arc constitute curve-like, wherein the straight line close to shank rotation axis and intersect with it.
3. a kind of self-centering drill bit according to claim 2, it is characterised in that: the central axes of the straight line and shank have
22.5 ° -25 ° of angle.
4. a kind of self-centering drill bit according to claim 3, it is characterised in that: between the straight line and the central axes of shank
Angle be 24.425 °.
5. a kind of self-centering drill bit according to claim 2, it is characterised in that: the radius of the circular arc is the cutting portion
0.2-0.3 times of the diameter of Cylinder Surface.
6. a kind of self-centering drill bit according to claim 5, it is characterised in that: the radius of the circular arc is the cutting portion
0.25 times of the diameter of Cylinder Surface.
7. a kind of self-centering drill bit according to claim 1 or 2, it is characterised in that: the both ends endpoint structure of the cutting edge
At straight line and the angle of rotation axis of shank be 55 ° -70 °.
8. a kind of self-centering drill bit according to claim 7, it is characterised in that: what the both ends endpoint of the cutting edge was constituted
The angle of the rotation axis of straight line and shank is 59 °.
9. a kind of self-centering drill bit according to claim 1, it is characterised in that: there are two the cutting portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821681049.8U CN208895249U (en) | 2018-10-17 | 2018-10-17 | A kind of self-centering drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821681049.8U CN208895249U (en) | 2018-10-17 | 2018-10-17 | A kind of self-centering drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208895249U true CN208895249U (en) | 2019-05-24 |
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ID=66575993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821681049.8U Active CN208895249U (en) | 2018-10-17 | 2018-10-17 | A kind of self-centering drill bit |
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| Country | Link |
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| CN (1) | CN208895249U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111774587A (en) * | 2020-07-29 | 2020-10-16 | 厦门理工学院 | Self-suction trepanning drill and using method thereof |
-
2018
- 2018-10-17 CN CN201821681049.8U patent/CN208895249U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111774587A (en) * | 2020-07-29 | 2020-10-16 | 厦门理工学院 | Self-suction trepanning drill and using method thereof |
| CN111774587B (en) * | 2020-07-29 | 2021-07-23 | 厦门理工学院 | Self-suction trepanning drill and using method thereof |
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