CN206065496U - A kind of single-blade microbit - Google Patents
A kind of single-blade microbit Download PDFInfo
- Publication number
- CN206065496U CN206065496U CN201621102143.4U CN201621102143U CN206065496U CN 206065496 U CN206065496 U CN 206065496U CN 201621102143 U CN201621102143 U CN 201621102143U CN 206065496 U CN206065496 U CN 206065496U
- Authority
- CN
- China
- Prior art keywords
- chip area
- microbit
- blade
- chip
- line
- Prior art date
- 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.)
- Withdrawn - After Issue
Links
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 6
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 241000218236 Cannabis Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000628997 Flos Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Drilling Tools (AREA)
Abstract
The utility model discloses a kind of single-blade microbit, offered from the front end face of the leading section of drill bit backward and be spiral helicine first chip area, the second chip area and the 3rd chip area, first chip area and second chip area are rotationally symmetrical in 180 ° centered on unbearable, the part edge of first chip area forms main cutting edge, on second chip area, corresponding edge rotationally symmetrical with the main cutting edge is removed and forms the 3rd chip area, does not form shear action.By adjusting the first chip area and the second chip area, can ensure that main cutting edge there are enough amount of support, ensure the rigidity of drill body, the first chip area and the second discharge launder can chip removal backward, improve chip removal performance, simultaneously, first chip area and the second chip area are rotationally symmetrical into 180 °, compared with asymmetric manner, reduce the skew of barycenter, beat during lead plug is reduced, borehole accuracy is improve.
Description
Technical field
This utility model is related to the technical field of drill bit, more particularly to a kind of single-blade microbit.
Background technology
Need to use drill bit in drilling, fluted drill is a kind of conventional drill bit, fluted drill is set in the shape of a spiral in outer peripheral face
Two chip areas are put, land portion is set between chip area, in rake face and front knife towards the bit direction of chip area
The intersection ridge line section of the rear knife face on rear side of face arranges two symmetrical cutting edges.Two chip areas of fluted drill are generally arranged
Relative to the symmetrical position of bit revenue centre, it is possible to use centrosymmetric blade is balanced good cutting,
And chip removal is functional, high-precision hole machined can be carried out, therefore using extensive.
As the highly integrated and precise treatment of electronic product develops, printed circuit board (PCB) is progressively to small-bore, narrow line
Direction away from, high density and many numbers of plies is developed, its requirement to machine drilling, such as hole position precision and breaking of rod rate, more and more higher.With
It is generally speaking all smaller in the brill footpath (diameter of drill bit outer rim) of the drill bit of pcb board, to adapt to the demand of small-bore.But,
For general fluted drill, if forming the drill bit in bradawl footpath, the wall thickness of drill bit reduces, and rigidity is reduced, and drill bit is being bored
During hole, it is easily bent, causes the reduction of bore position precision.Additionally, PCB is usually to be formed in braided glass fibre
In glass fabric, impregnating resin forms pre-soaked resin blank, is formed in the top layer lamination Copper Foil of the pre-soaked resin blank, right and wrong
Homogeneous composite material, and the bending of glass fibre has influence on hole site precision very sensitively, so being bored using Small-diameter drill
When cutting PCB, hole site precision is further reduced.Therefore, by the general of Small-diameter drill, particularly use in printed circuit board bradawl footpath
Logical Flos Cannabiss drill bit is difficult to obtain good hole site precision comparison.CN200510105356.2 proposes a kind of double chip removing grooves
Relative to the new construction drill bit of center of rotation non-centrosymmetry, wall thickness (rigidity) is guaranteed by forming first chip area
Structure, another chip area are arranged relative to first chip area non-centrosymmetry biasing, are not formed main cutting edge, are not played cutting
Effect, and its flute length is less than the first chip area flute length, increased certain wall thickness, thus increased the rigidity of drill bit, improves
The precision of drilling.But the apex point being asymmetrically designed causes centroid motion, beat during drilling, is susceptible to, reduces drilling essence
Degree.
Utility model content
The purpose of this utility model is to propose a kind of single-blade microbit, with preferable rigidity, and reduces barycenter
Skew, reduce lead plug when beat, improve borehole accuracy.
It is that, up to this purpose, this utility model is employed the following technical solutions：
A kind of single-blade microbit, offers from the front end face of the leading section of drill bit backward and is spiral helicine first chip removal
Groove, the second chip area and the 3rd chip area, first chip area and second chip area are revolved in 180 ° centered on unbearable
Turn symmetrical, the part edge of first chip area forms main cutting edge, revolves with the main cutting edge on second chip area
Turn symmetrical corresponding edge and be removed to form the 3rd chip area, do not form shear action.
Wherein, the 3rd chip area connects first chip area and second chip area.
Wherein, spiral extension backward side by side after the 3rd chip area is connected with first chip area.
Wherein, the 3rd chip area and second chip area are short blind slot and are not connected with first chip area
It is logical.
Wherein, chisel edge is provided with the top of the leading section, the part of the chisel edge is removed and forms the 4th chip area.
Wherein, first chip area and the line of two end points of close apex point on the intersection of the outer rim of drill bit are first
End points on line, the 3rd chip area and the intersection of the 4th chip area near apex point is the first intersection point, the described 3rd
Chip area is the second intersection point, first intersection point and second intersection point with the end points of close apex point on the intersection of the outer rim of drill bit
Line be 45 ° -90 ° for the angle of the second line, first line and second line.
Wherein, the 4th chip area and the end points of close apex point on the intersection of second chip area are the 3rd intersection point,
The line of first intersection point and the 3rd intersection point is the 3rd line, and the 3rd line with the angle of second line is
5°-75°。
Wherein, 2.5 times -4 times for bit diameter of the length of second chip area, the length of the 4th chip area
For 1 times -4 times of bit diameter.
Wherein, first chip area, second chip area and the 3rd chip area be respectively helical angle 38 °-
The helicla flute of constant or change in 42 °.
Wherein, groove depth of the second chip removal groove deep less than first chip area, and more than the 10% of drill bit radius.
Beneficial effect：This utility model provides a kind of single-blade microbit, from the front end face of the leading section of drill bit backward
Offer and be spiral helicine first chip area, the second chip area and the 3rd chip area, first chip area and described second
Chip area is rotationally symmetrical in 180 ° centered on unbearable, and the part edge of first chip area forms main cutting edge, and described the
On two chip areas, corresponding edge rotationally symmetrical with the main cutting edge is removed and forms the 3rd chip area, does not form cutting
Effect.By adjusting the first chip area and the second chip area, it is ensured that main cutting edge has enough amount of support, it is ensured that drill bit sheet
The rigidity of body, the first chip area and the second discharge launder can chip removal backward, improve chip removal performance, meanwhile, the first chip area
It is rotationally symmetrical into 180 ° with the second chip area, the skew of barycenter compared with asymmetric manner, is reduced, it is inclined during reduction lead plug
Pendulum, improves borehole accuracy.
Description of the drawings
Fig. 1 is the partial structural diagram of the horizontal positioned of the single-blade microbit that embodiment of the present utility model 1 is provided.
Fig. 2 is the structural representation of the single-blade microbit that embodiment of the present utility model 1 is provided.
Fig. 3 is the partial enlarged drawing at the A of Fig. 2.
Fig. 4 is the partial structural diagram one of the single-blade microbit that embodiment of the present utility model 1 is provided.
Fig. 5 is the partial structural diagram two of the single-blade microbit that embodiment of the present utility model 1 is provided.
Fig. 6 is the partial structural diagram three of the single-blade microbit that embodiment of the present utility model 1 is provided.
Fig. 7 is the view in the apex point direction of the single-blade microbit that embodiment of the present utility model 1 is provided.
Fig. 8 is the view in the apex point direction of the single-blade microbit that embodiment of the present utility model 2 is provided.
Fig. 9 is the structural representation of the single-blade microbit that embodiment of the present utility model 2 is provided.
Figure 10 is the partial enlarged drawing at the B of Fig. 9.
Figure 11 is the partial structural diagram one of the single-blade microbit that embodiment of the present utility model 2 is provided.
Figure 12 is the partial structural diagram two of the single-blade microbit that embodiment of the present utility model 2 is provided.
Wherein：
The first chip areas of 1-, the first lines of 11-, the second chip areas of 2-, the 3rd chip areas of 3-, the first intersection points of 31-, 32-
Two intersection points, the second lines of 33-, the 4th chip areas of 4-, the 3rd intersection points of 41-, the 3rd lines of 41-, 5- main cutting edges, 6- chisel edges, 7-
The angle of guide part, α-drift angle, β-helical angle, θ-the first chip areas and the 3rd chip area, four chip areas of γ-the and the 3rd chip removal
The angle of groove, length of the L- guide parts along drill bit axial direction.
Specific embodiment
Technique effect to make this utility model technical problem for solving, the technical scheme for adopting and reach is clearer,
The technical solution of the utility model is further illustrated below in conjunction with the accompanying drawings and by specific embodiment.
Embodiment 1
As shown in Fig. 1-Fig. 7, present embodiments provide a kind of single-blade microbit, from the front end of the leading section of drill bit towards
After offer and be spiral helicine first chip area 1, the second chip area 2 and the 3rd chip area 3, the first chip area 1 and second row
Bits groove 2 is rotationally symmetrical in 180 ° centered on unbearable, and the part edge of the first chip area 1 forms main cutting edge 5, the second chip area
On 2, corresponding edge rotationally symmetrical with main cutting edge 5 is removed and forms the 3rd chip area 3, does not form shear action.
Compared with double cutting edges, when only to have a cutting edge be main cutting edge 5, can only consideration main cutting edge 5 it is firm
Property, by adjusting the first chip area 1 and the second chip area 2, can preferentially meet the wall thickness at 5 rear of main cutting edge, with obtain compared with
Big amount of support, improves the rigidity of main cutting edge 5.First chip area 1 and the second discharge launder 2 can chip removal, improve chip removal
Performance, meanwhile, the first chip area and the second chip area are rotationally symmetrical into 180 °, compared with asymmetrical mode, barycenter closer to
The center of drill bit, reduces the skew of barycenter, reduces beat during lead plug, improves borehole accuracy.Second chip area, 2 groove depth can
To be set smaller than the groove depth of the first chip area 1, and more than the 10% of drill bit radius.Groove depth refers to the depth of groove, the row of spiral
The groove depth of bits groove refer to the edge of chip area to chip area bottom along the radial direction of drill bit distance, due to the second chip area
2 are only intended to discharge chip, therefore, in order to improve the rigidity of the main cutting edge 5 on the first chip area 1, it is possible to reduce second row
The groove depth of bits groove 2, increases the amount of support at 5 rear of main cutting edge.However, to ensure that holding bits performance and chip removal performance, the second chip removal
The groove depth of groove 2 should be more than the 10% of drill bit radius.
In the present embodiment, the 3rd chip area 3 and the second chip area 2 are short blind slot and are not connected with the first chip area 1.
Avoid with the connected region of the first chip area 1 at metallic matrix very little, drill bit rigidity reduction, affect drilling essence
Degree, and easily snap off.First chip area 1 can be the helicla flute that helixangleβ is constant in 35 ° -50 ° or changes.Helical angle mistake
When big, the pitch of the first chip area 1 is smaller, i.e., longer and more multi-turn the first chip area is had on the drill bit of equal length
1, the amount of the metallic matrix that drill bit is removed is relatively more, and the rigidity variation of drill bit, borehole accuracy decline and easily snap off.Helical angle
When too small, the first chip area 1 tails off, and holding bits performance and chip removal performance reduces.Helical angle can be further selected as 38 ° -42 °
It is advisable, reasonable chip removal performance can be taken into account, hold the rigidity of bits performance and drill bit.Second chip area 2 and the 3rd chip area 3
Also it is that helical angle is constant in 35 ° -50 ° or the helicla flute of change at 35 ° -50 ° to be respectively helical angle, the second chip area 2 and the
Three chip areas 3 are by adjusting helical angle, it is to avoid connect with the first chip area 1, to ensure that drill bit has preferably rigidity.
The single-blade microbit of this enforcement also includes the 4th chip area 4, and chisel edge 6, chisel edge 6 are provided with the top of leading section
Part be removed form the 4th chip area 4, the 4th chip area 4 is may be located between the second chip area 2 and the 3rd chip area 3,
Can also be on the second chip area 2 or the 3rd chip area 3, depending on practical situation.By arranging the 4th chip area
4, the length of chisel edge 6 is reduced, cutting temperature is reduced, and is reduced the chisel edge in the second chip area 2 and 3 region of the 3rd chip area
After 6, the chip in entering into the second chip area 2 and the 3rd chip area 3 is reduced, it is to avoid be deposited in the second chip area 2 and the 3rd row
In bits groove 3, cause chip removal obstruction in short blind slot.
The length of the second chip area 2 can be 2.5 times -4 times of bit diameter, and the length of the 4th chip area 4 is that drill bit is straight
1 times -4 times of footpath, within this range, it is possible to obtain reasonable chip removal performance, while avoiding connecting with the first chip area.
As shown in fig. 7, when the apex angle α of the apex point of drill bit is excessive, cutting ability declines, when apex angle α is too small, apex point it is wear-resisting
Degradation, apex angle α can be 100 ° -140 °, take into account the wearability and cutting ability of drill bit, general to adopt 130 °, to obtain
Reasonable wearability and cutting ability.
The single-blade microbit of this enforcement is that UC type drill bits, the i.e. outer wall in the leading section of drill bit are convexly equipped with for being oriented to
Guide part 7, it is however generally that, the external diameter of guide part 7 and equal diameters hole to be drilled, with the precision for ensureing to drill, 7 rear of guide part
The external diameter of drill bit be slightly less than the external diameter of guide part 7, reduce the friction of outer wall and the inwall in hole of the drill bit at rear.Guide part edge
Length L of drill bit axial direction could be arranged to 0.4mm-0.6mm, to take into account steering capability, obtain preferable borehole accuracy, and
The problem for avoiding the frictional force that too long of guide part 7 brings excessive.The brill footpath of this kind of single-blade microbit can be 0.15mm-
0.7mm, here to be bored and can obtain reasonable borehole accuracy using this structure under footpath.
Embodiment 2
As different from Example 1, as shown in Fig. 8-Figure 12, connection 1 He of the first chip area of the 3rd chip area 3 of this enforcement
Second chip area 2, and spiral extension backward side by side after the 3rd chip area 3 is connected with the first chip area 1.3rd chip area 3 is by
After one chip area 1 is connected with the second chip area 2,1 chip is discharged from the first chip area 1 and from the second chip area 2 and the 3rd row
The chip discharged in bits groove 3 can mutually collide broken in intersection, it is to avoid chip continues winding in the chip area at rear, affect
Chip removal.3rd chip area 3 connect with the first chip area 1 after spiral extension backward side by side, the appearance bits of the first chip area can be increased
Performance and chip removal performance.The flute length of the 3rd chip area 3 can be equal with the flute length of the first chip area 1, i.e., follow first row always
Bits groove 1 extends to the end in the length of cut direction of drill bit, improves the chip removal performance in whole length of cut direction.
As shown in figure 8, on first chip area 1 of the present embodiment and the intersection of the outer rim of drill bit near apex point two end points
Line for the first line 11, the 3rd chip area 3 and the 4th chip area 4 intersection near apex point end points be the first intersection point
31, the end points on the 3rd chip area 3 and the intersection of the outer rim of drill bit near apex point is the second intersection point 32, the first intersection point 31 and second
The line of intersection point 32 is the first chip area 1 and the 3rd chip removal for the angle of the second line 33, the first line 11 and the second line 33
The angle theta of groove 3.When θ is excessive, the outer rim of the first chip area 1 can be cut away, it is impossible to form preferable supporting construction, reduce brill
The rigidity of head, when θ is too small, the 3rd chip area 3 cannot be resected to the cutting edge on the second chip area 2.θ can be 45 ° -90 °, than
It is appropriate.
On the intersection of the 4th chip area 4 and the second chip area 2 near apex point end points be the 3rd intersection point 41, the first intersection point 31
It is threeth chip area 3 and for the angle of the 3rd line 42, the 3rd line 42 and the second line 33 with the line of the 3rd intersection point 41
Angle γ between four chip areas 4, the value of γ mainly affect the length of chisel edge 6, the excessive or too small length that can cause chisel edge 6 to spend
It is little or excessive, cause cutting temperature very high or have reasonable positioning precision when cannot drill in the early stage.γ is at 5 ° -75 °
It is proper.In embodiment 1, the value of θ and γ is also proper in the range of the present embodiment.
Above content is only preferred embodiment of the present utility model, for one of ordinary skill in the art, according to this reality
With new thought, will change in specific embodiments and applications, this specification content should not be construed as
To restriction of the present utility model.
Claims (10)
1. a kind of single-blade microbit, it is characterised in that offered from the front end face of the leading section of drill bit backward and be helical form
The first chip area (1), the second chip area (2) and the 3rd chip area (3), first chip area (1) and second chip removal
Groove (2) is rotationally symmetrical in 180 ° centered on unbearable, and the part edge of first chip area (1) forms main cutting edge (5), institute
State to be removed with the rotationally symmetrical corresponding edge of the main cutting edge (5) on the second chip area (2) and form the 3rd chip area
(3), shear action is not formed.
2. single-blade microbit as claimed in claim 1, it is characterised in that the 3rd chip area (3) connection described first
Chip area (1) and second chip area (2).
3. single-blade microbit as claimed in claim 2, it is characterised in that the 3rd chip area (3) and the first row
Spiral extension backward side by side after bits groove (1) connection.
4. single-blade microbit as claimed in claim 1, it is characterised in that the 3rd chip area (3) and the second row
Bits groove (2) are short blind slot and are not connected with first chip area (1).
5. the single-blade microbit as described in any one of claim 1-4, it is characterised in that be provided with the top of the leading section
Chisel edge (6), the part of the chisel edge (6) are removed and form the 4th chip area (4).
6. single-blade microbit as claimed in claim 5, it is characterised in that the outer rim of first chip area (1) and drill bit
Intersection near apex point two end points line be the first line (11), the 3rd chip area (3) and the 4th row
End points on the intersection of bits groove (4) near apex point is the friendship of the outer rim of the first intersection point (31), the 3rd chip area (3) and drill bit
End points on line near apex point is for the line of the second intersection point (32), first intersection point (31) and second intersection point (32)
The angle of two lines (33), first line (11) and second line (33) is 45 ° -90 °.
7. single-blade microbit as claimed in claim 6, it is characterised in that the 4th chip area (4) and the second row
End points on the intersection of bits groove (2) near apex point is the 3rd intersection point (41), first intersection point (31) and the 3rd intersection point
(41) line is the 3rd line (42), and the 3rd line (42) is 5 ° -75 ° with the angle of second line (33).
8. single-blade microbit as claimed in claim 5, it is characterised in that the length of second chip area (2) is drill bit
- 4 times of 2.5 times of diameter, the length of the 4th chip area (4) are 1 times -4 times of bit diameter.
9. the single-blade microbit as described in any one of claim 1-4, it is characterised in that first chip area (1), described
Second chip area (2) and the 3rd chip area (3) are respectively the helicla flute that helical angle is constant in 38 ° -42 ° or changes.
10. the single-blade microbit as described in any one of claim 1-4, it is characterised in that the second chip area (2) groove depth
Less than the groove depth of first chip area (1), and more than the 10% of drill bit radius.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621102143.4U CN206065496U (en) | 2016-09-30 | 2016-09-30 | A kind of single-blade microbit |
| TW105219965U TWM548042U (en) | 2016-09-30 | 2016-12-29 | Single cutting miniature drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621102143.4U CN206065496U (en) | 2016-09-30 | 2016-09-30 | A kind of single-blade microbit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206065496U true CN206065496U (en) | 2017-04-05 |
Family
ID=58441631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621102143.4U Withdrawn - After Issue CN206065496U (en) | 2016-09-30 | 2016-09-30 | A kind of single-blade microbit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206065496U (en) |
| TW (1) | TWM548042U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270666A (en) * | 2016-09-30 | 2017-01-04 | 深圳市金洲精工科技股份有限公司 | A kind of single-blade microbit |
| CN107262785A (en) * | 2017-06-14 | 2017-10-20 | 东莞艾瑞克精密工具有限公司 | Drill point and hole processing tool with drill point |
| CN111421169A (en) * | 2020-04-17 | 2020-07-17 | 贵州理工学院 | A chisel edge micro-grooved carbide drill for cutting aluminum alloys |
-
2016
- 2016-09-30 CN CN201621102143.4U patent/CN206065496U/en not_active Withdrawn - After Issue
- 2016-12-29 TW TW105219965U patent/TWM548042U/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270666A (en) * | 2016-09-30 | 2017-01-04 | 深圳市金洲精工科技股份有限公司 | A kind of single-blade microbit |
| WO2018058752A1 (en) * | 2016-09-30 | 2018-04-05 | 深圳市金洲精工科技股份有限公司 | Single-blade micro drill bit |
| CN107262785A (en) * | 2017-06-14 | 2017-10-20 | 东莞艾瑞克精密工具有限公司 | Drill point and hole processing tool with drill point |
| CN107262785B (en) * | 2017-06-14 | 2019-05-17 | 东莞艾瑞克精密工具有限公司 | Drill point and hole machining tool with same |
| CN111421169A (en) * | 2020-04-17 | 2020-07-17 | 贵州理工学院 | A chisel edge micro-grooved carbide drill for cutting aluminum alloys |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM548042U (en) | 2017-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106270666B (en) | A kind of single-blade microbit | |
| CN206065496U (en) | A kind of single-blade microbit | |
| US20120195704A1 (en) | Drill bit | |
| CN108012420A (en) | A kind of molding milling method of pcb board microflute | |
| CN110170686A (en) | A kind of microbit | |
| CN203484717U (en) | Micro drill for processing of halogen-free plates and thick copper plates | |
| CN204893047U (en) | Drill point chip breaking structure for circuit board | |
| JP2012148384A (en) | Drill bit structure | |
| CN204770837U (en) | Specific drill bit is used in processing of PCB slotted hole | |
| CN205733157U (en) | For holing in component carrier and making the smooth reamer drill in hole and component carrier | |
| CN101176930B (en) | Minisize drill bit for PCB plate drilling hole | |
| CN105562788B (en) | For the drill bit of pcb board drilling | |
| CN204504306U (en) | Ultra-small diameter PCB slotted eye processing and forming drill point | |
| JP2014104577A (en) | Reverse taper drill structure | |
| CN205464476U (en) | A drill bit for drilling of PCB board | |
| TWI222387B (en) | Drill bit | |
| CN210817596U (en) | Micro drill bit | |
| CN208961067U (en) | A kind of high intensity length groove cutter | |
| CN102218559A (en) | Microbit for machining printing circuit board | |
| CN203470990U (en) | Miniature drill bit | |
| US20060115338A1 (en) | Method for making miniature tri-blade drill and structure of the same | |
| CN202490958U (en) | Improved structure of drill point | |
| CN203109307U (en) | Drill bit structure | |
| CN204504303U (en) | Communication board secondary operations drill point | |
| TW201347880A (en) | Drill structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170405 Effective date of abandoning: 20181102 |
|
| AV01 | Patent right actively abandoned |