CN205218135U - Micro -drill bit - Google Patents
Micro -drill bit Download PDFInfo
- Publication number
- CN205218135U CN205218135U CN201520981257.XU CN201520981257U CN205218135U CN 205218135 U CN205218135 U CN 205218135U CN 201520981257 U CN201520981257 U CN 201520981257U CN 205218135 U CN205218135 U CN 205218135U
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- China
- Prior art keywords
- angle
- plane
- transition
- handle
- microbit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a micro -drill bit, including main handle, vice handle, brill body and drill tip, it passes through to bore the one end of body vice handle is connected main handle, the other end is formed with the drill tip, the drill tip symmetry is provided with two rake faces and two back knife faces, rake face and the crossing main cutting edge that forms of back knife face, first inclined plane, second inclined plane and third inclined plane that back knife face is increased by inclination in proper order constitute, and the first inclined plane of every back knife face all intersects a formation chisel edge with the third inclined plane of another back knife face, bore and be equipped with spiral helicine chip groove on one's body, the chip groove is including invariable section and transition, invariable section is close to toper portion, its helical angle is invariable, the transition is close to drill tip portion, its helical angle is from drill tip portion to invariable section grow gradually, the helical angle of invariable section is greater than the helical angle of transition. The utility model discloses centering is accurate, and the axial atress is little, has also guaranteed the fastness and the axiality of drill point simultaneously.
Description
Technical field
The utility model relates to drilling manufacture field, in particular, relates to a kind of microbit.
Background technology
Drill bit generally includes drillstock, bores body and apex point, and apex point place has two symmetrical main cutting edges and two symmetrical chisel edges, bores and is provided with two the spiral helicine chip areas corresponding with main cutting edge with it.
During bit operation, first chisel edge touches workpiece, plays the effect of centering, and directly has influence on shaped position and the dimensional accuracy of boring, and the axial force that chisel edge produces accounts for more than 50% of drilling axial force, and therefore chisel edge directly has influence on the life-span of drill bit.Be arrangeding in parallel of two chisel edges of existing drill bit, is unfavorable for that drill bit pierces workpiece like this, is easy to produce slippage at surface of the work.In addition, the chisel edge of existing drill bit is longer, and axially loaded is large, thus reduces drilling efficiency and bit life.
In addition, for cost and consideration easy to process, the drill body part of drill point divides and usually adopts unlike material with drillstock part, then drill body part to be divided and the end face of drillstock part carries out plane butt welding, its subject matter existed is, drill body part divides and divides the weld seam of joint easily to rupture with drill shank, and it is poor that drill body part divides with the axiality of drillstock part.
Utility model content
The purpose of this utility model is to provide a kind of microbit, and accurately, axially loaded is little, and stock-removing efficiency is high, and durability is good, also ensure that fastness and the axiality of drill point simultaneously in its centering.
For achieving the above object, the utility model is by the following technical solutions:
A kind of microbit, comprise main handle, secondary handle, bore body and apex point, one end of described brill body connects described main handle by described secondary handle, the other end is formed with described apex point, described apex point is symmetrically arranged with knife face after two rake faces and two, described rake face and rear knife face intersect formation main cutting edge, the first inclined-plane that described rear knife face is increased successively by angle of inclination, second inclined-plane and the 3rd inclined-plane are formed, the 3rd crossing formation one in inclined-plane chisel edge of all rear with another knife face in the first inclined-plane of each rear knife face, described brill is provided with spiral helicine chip area with it, described chip area comprises constant section and transition, described constant section of close described secondary handle, its helical angle is invariable, described transition is near described apex point, its helical angle becomes large from apex point gradually to constant section, the helical angle of described constant section is greater than the helical angle of described transition.
Preferably, described second inclined-plane is the first relief angle relative to the angle that the first inclined-plane tilts, and described 3rd inclined-plane is the second relief angle relative to the angle that the second inclined-plane tilts, and the angle of described second relief angle is greater than the angle of described first relief angle.
Preferably, the helical angle excursion of described transition is 30 ° ~ 50 °, and the helical angle of described constant section is 45 °.
Preferably, the length of described transition is 0.3 ~ 0.5 with the ratio of brill body total length.
Preferably, the gash depth of the described transition gash depth that is greater than described constant section.
Preferably, one end of described main handle is provided with fixing hole, and the inwall of described fixing hole is provided with one group of locating slot; Described secondary handle comprises weld part and tapered portion, described weld part is inserted in described fixing hole and is also connected in one by welding and described main handle, the outer surface of described weld part is provided with one group of convex tendon matched with described locating slot, one end of described tapered portion connects described weld part, and the other end connects described brill body.
Preferably, the fixing hole of described main handle is circular hole, and the weld part of described secondary handle is cylindric.
Preferably, the ora terminalis that described main handle is provided with one end of fixing hole is provided with chamfering, and the tapered portion of described chamfering and described secondary handle adapts.
After adopting technique scheme, the utility model is compared with background technology, and tool has the following advantages:
1, the rear knife face of the utility model apex point is designed to the inclined-plane that three angles of inclination increase successively, reduces the angle between two chisel edges, is conducive to drill bit and pierces workpiece, and centering accurately; Reduce the length of chisel edge, axially loaded is little simultaneously, and stock-removing efficiency is high, and durability is good, extends the service life of drill bit.
2, the utility model is by welding in the fixing hole that the weld part of secondary handle inserted main handle, and make secondary handle and bore body to be fixed on main handle, fixation, the overall axiality of drill point is good.
3, chip area of the present utility model adopts two-piece design, i.e. constant section and transition, and the helical angle of constant section is comparatively large, and can strengthen chip removal ability, the helical angle of transition is less, can reduce the loss of drill point; In addition, the groove of constant section is more shallow, can ensure rigidity and the bulk strength of drill point, and the groove of transition is comparatively dark, and can ensure that transition has enough chip spaces, chip can not be trapped in the hole of printed circuit board (PCB).
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the perspective view of the main handle of the utility model.
Fig. 3 is the perspective view of the secondary handle of the utility model.
Fig. 4 is the structural representation of the utility model apex point.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment
Refer to Fig. 1, the utility model discloses a kind of microbit, comprise main handle 1, secondary handle 2, bore body 3 and apex point 4, wherein:
Shown in figure 2, one end of main handle 1 is provided with fixing hole 11, and fixing hole 11 is circular hole, and the inwall of fixing hole 11 is provided with one group of locating slot 111.
Shown in figure 3, secondary handle 2 is made up of weld part 21 and tapered portion 22, weld part 21 is inserted in fixing hole 11 and is also connected in one by welding and main handle 1, the outer surface of weld part 21 is provided with one group of convex tendon 211 matched with locating slot 111, such one side can realize positioning main handle 1 and secondary handle 2, also enhances the fastness that main handle 1 is combined with secondary handle 2 on the other hand.
In the present embodiment, the ora terminalis that main handle 1 is provided with one end of fixing hole 11 is provided with chamfering 12, chamfering 12 adapts with the tapered portion 22 of secondary handle 2, namely chamfering 12 is identical relative to the angle of inclination of drill point axis with tapered portion 22 relative to the angle of inclination of drill point axis, the end face of chamfering 12 correspondence is consistent with the rear end face of tapered portion 22, like this in drill point manufacturing process, easily identify main handle 1 and secondary handle 2 whether accurate contraposition.
Shown in figure 1, bore body 3 one-body molded with secondary handle 2, its one end is connected with tapered portion 22, and the other end is formed with apex point 4, bores body 3 and is provided with spiral helicine chip area 31, wherein:
Chip area 31 comprises constant section and transition, constant section of close tapered portion 22, and its helical angle is invariable, and transition is near apex point 4, and its helical angle becomes large from apex point 4 gradually to constant section, and the helical angle of constant section is greater than the helical angle of transition.The gash depth that the gash depth of transition is greater than constant section.In the present embodiment, the helical angle excursion of transition is 30 ° ~ 50 °, and the helical angle of constant section is 45 °, and the length of transition is 0.3 ~ 0.5 with the ratio of the total length boring body 3.
Shown in figure 4, apex point 4 is symmetrically arranged with knife face 41 after two rake face (not shown)s and two, rake face and rear knife face 41 intersect formation main cutting edge 42, and the first inclined-plane 412, inclined-plane 411, second that rear knife face 41 is increased successively by angle of inclination and the 3rd inclined-plane 413 are formed.The 3rd crossing formation one in inclined-plane 413 chisel edge 43 of all rear with another knife face 41 in the first inclined-plane 411 of each rear knife face 41, such chisel edge 43 can relative to drill bit axis inclination certain angle, reduce the angle between two chisel edges 43, be conducive to drill bit and pierce workpiece, avoid apex point 4 in surface of the work slippage, centering accurately, also reduce the length of chisel edge 43, axially loaded is little simultaneously, and stock-removing efficiency is high, durability is good, extends the service life of drill bit.
Second inclined-plane 412 is the first relief angle relative to the angle that the first inclined-plane 411 tilts, 3rd inclined-plane 413 is the second relief angle relative to the angle that the second inclined-plane 412 tilts, the angle of the second relief angle is greater than the angle of the first relief angle, the frictional force of hole wall to apex point 4 can be reduced like this, cut sharper, the structure of apex point 4 is also more stable simultaneously, can provide enough holding powers for main cutting edge 42, enhance the anti-adaptability to changes of apex point 4, thus ensure that the life-span of drill bit.In the present embodiment, the angle of the first relief angle is 10-15 °, and the angle of the second relief angle is 20-30 °.
The above; be only the utility model preferably detailed description of the invention; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (8)
1. a microbit, it is characterized in that: comprise main handle, secondary handle, bore body and apex point, one end of described brill body connects described main handle by described secondary handle, the other end is formed with described apex point, described apex point is symmetrically arranged with knife face after two rake faces and two, described rake face and rear knife face intersect formation main cutting edge, the first inclined-plane that described rear knife face is increased successively by angle of inclination, second inclined-plane and the 3rd inclined-plane are formed, the 3rd crossing formation one in inclined-plane chisel edge of all rear with another knife face in the first inclined-plane of each rear knife face, described brill is provided with spiral helicine chip area with it, described chip area comprises constant section and transition, described constant section of close described secondary handle, its helical angle is invariable, described transition is near described apex point, its helical angle becomes large from apex point gradually to constant section, the helical angle of described constant section is greater than the helical angle of described transition.
2. a kind of microbit as claimed in claim 1, it is characterized in that: described second inclined-plane is the first relief angle relative to the angle that the first inclined-plane tilts, described 3rd inclined-plane is the second relief angle relative to the angle that the second inclined-plane tilts, and the angle of described second relief angle is greater than the angle of described first relief angle.
3. a kind of microbit as claimed in claim 1 or 2, is characterized in that: the helical angle excursion of described transition is 30 ° ~ 50 °, and the helical angle of described constant section is 45 °.
4. a kind of microbit as claimed in claim 3, is characterized in that: the length of described transition is 0.3 ~ 0.5 with the ratio of brill body total length.
5. a kind of microbit as claimed in claim 3, is characterized in that: the gash depth that the gash depth of described transition is greater than described constant section.
6. a kind of microbit as claimed in claim 1, is characterized in that: one end of described main handle is provided with fixing hole, and the inwall of described fixing hole is provided with one group of locating slot; Described secondary handle comprises weld part and tapered portion, described weld part is inserted in described fixing hole and is also connected in one by welding and described main handle, the outer surface of described weld part is provided with one group of convex tendon matched with described locating slot, one end of described tapered portion connects described weld part, and the other end connects described brill body.
7. a kind of microbit as claimed in claim 6, is characterized in that: the fixing hole of described main handle is circular hole, and the weld part of described secondary handle is cylindric.
8. a kind of microbit as claimed in claim 6, is characterized in that: the ora terminalis that described main handle is provided with one end of fixing hole is provided with chamfering, and the tapered portion of described chamfering and described secondary handle adapts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520981257.XU CN205218135U (en) | 2015-12-01 | 2015-12-01 | Micro -drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520981257.XU CN205218135U (en) | 2015-12-01 | 2015-12-01 | Micro -drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205218135U true CN205218135U (en) | 2016-05-11 |
Family
ID=55893230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520981257.XU Expired - Fee Related CN205218135U (en) | 2015-12-01 | 2015-12-01 | Micro -drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205218135U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107262785A (en) * | 2017-06-14 | 2017-10-20 | 东莞艾瑞克精密工具有限公司 | A kind of apex point and the aperture knife tool with apex point |
| CN110521532A (en) * | 2019-09-30 | 2019-12-03 | 中南林业科技大学 | A kind of integrated rotating drill bit and Portable rotating drilling machine and butt breaking method |
| CN111975046A (en) * | 2019-05-24 | 2020-11-24 | 江苏叁陆零工具有限公司 | Composite structure of micro drill bit |
| CN113042787A (en) * | 2021-03-24 | 2021-06-29 | 武汉理工大学 | Twist drill and manufacturing method thereof |
-
2015
- 2015-12-01 CN CN201520981257.XU patent/CN205218135U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107262785A (en) * | 2017-06-14 | 2017-10-20 | 东莞艾瑞克精密工具有限公司 | A kind of apex point and the aperture knife tool with apex point |
| CN107262785B (en) * | 2017-06-14 | 2019-05-17 | 东莞艾瑞克精密工具有限公司 | A kind of apex point and the aperture knife tool with apex point |
| CN111975046A (en) * | 2019-05-24 | 2020-11-24 | 江苏叁陆零工具有限公司 | Composite structure of micro drill bit |
| CN110521532A (en) * | 2019-09-30 | 2019-12-03 | 中南林业科技大学 | A kind of integrated rotating drill bit and Portable rotating drilling machine and butt breaking method |
| CN113042787A (en) * | 2021-03-24 | 2021-06-29 | 武汉理工大学 | Twist drill and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181201 |