CN207288981U - A kind of fluted drill with special trench structure and web thinning structure - Google Patents
A kind of fluted drill with special trench structure and web thinning structure Download PDFInfo
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- CN207288981U CN207288981U CN201721098765.9U CN201721098765U CN207288981U CN 207288981 U CN207288981 U CN 207288981U CN 201721098765 U CN201721098765 U CN 201721098765U CN 207288981 U CN207288981 U CN 207288981U
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- 238000007599 discharging Methods 0.000 claims abstract 2
- 238000012545 processing Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 description 17
- 238000005553 drilling Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 3
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a kind of fluted drill with special trench structure and web thinning structure, including shank and the cutting portion rotated about the axis, the parallel lines of two main cutting edges are located within drill core inscribed circle, the cutting portion is equipped with two grooves extended spirally from the front end of the cutting portion to the shank for discharging chip, the land for connecting two slot perimeter edges respectively is additionally provided with the cutting portion, it is characterized in that line forms small angle between line and groove minimum point between the two outer rim turning point of groove, it arises from one section of profile convergence straight line at outer rim turning point, using drill core center as origin, parallel to profile and the straight line of origin excessively is in the view of reference axis, profile is on reference axis.The utility model is that a kind of fluted drill with special trench structure and web thinning structure of design is intended to improve cutting blade structure and groove profile to improve the processing efficiency of fluted drill and service life.
Description
Technical field
Bit technique field under core is the utility model is related to, specifically there is special trench structure and reconditioning horizontal stroke to be a kind of
The fluted drill of sword structure.
Background technology
Fluted drill structure still suffers from some problems at present, and main cutting edge is longer, and the chip that drilling is formed is wide, due to each point
The chip rate of outflow is different, and Chip Morphology is usually wider helical form, and volume is excessive, causes chip discharge to have some setbacks and cool down
Not enough；Chisel edge is grown, this causes to load in fluted drill drilling process very greatly, produces excessive axial force, causes under drilling efficiency
Drop, fluted drill service life reduce；Anterior angle is big at outer rim turning point, cutting output is maximum, causes that its load is big, quick abrasion；Groove is cut
The design of type is perfect not enough, this causes the cutting edge of some shapes to be difficult to repair, and chip is molded in chip space and does not advise
Then, discharge has some setbacks.
In the preferable material of drilling some such as stainless steel toughness, often occur that chip curling is imperfect and not chip breaking etc.
Phenomenon, causes chip strikes hole wall, groove chip removal be not smooth frictional force and temperature is increased this use for leveraging drill bit
Service life, processing efficiency and hole wall quality.
Existing groove coordinates existing web thinning mode that fluted drill chisel edge and center sword can be allowed to be produced in drilling process
Raw great cutting force, this can not only influence processing efficiency, be even more that can greatly shorten fluted drill in face of some difficult-to-machine materials
Service life.
The utility model is that a kind of a kind of rational web thinning mode of new groove profile collocation of design is intended to improve cutting edge
Structure and groove profile improve the processing efficiency of fluted drill and service life.
Utility model content
The utility model develops a kind of fluted drill with special trench structure and web thinning structure, solves
State the technical problem of proposition.
The technological means that the utility model uses is as follows：A kind of fiber crops with special trench structure and web thinning structure
Flower bores, including shank and the cutting portion that rotates about the axis, the first sword line of the main cutting edge being parallel to each other and the second sword line all positions
Within drill core inscribed circle, the cutting portion is extended spirally equipped with two from the front end of the cutting portion to the shank to be used for
The groove of chip is discharged, is additionally provided with the land for connecting two slot perimeter edges respectively on the cutting portion, outside fluted drill
Circular diameter is D, and the groove has the drill core thickness K and 84 °~92 ° groove central angle θ of 16%~22%D；
Line and first groove minimum point and second groove between the first outer rim turning point and the second outer rim turning point of the groove
Line forms angle α between minimum point.
Preferably, line and first groove minimum point and second between groove the first outer rim turning point and the second outer rim turning point
The angle α that line is formed between groove minimum point is 27 °~37 °；
One section of profile curvature that the groove is arised from outer rim turning point is less than 0.05, and reference axis X is using drill core center O as original
Put and the straight line of origin O is crossed parallel to profile, on reference axis X, the vertical range L1 between profile and reference axis X is profile
8%~11%D；
The groove and that section of profile radius r of the minimum point contact of groove are 17%-22%D.
Preferably, apex point reconditioning is carried out to the groove, forms blunt apex angle η, the first sword of the main cutting edge being parallel to each other
Line and the second sword line are located within drill core inscribed circle.
Preferably, the main cutting edge straightway of the fluted drill using drill core center O as origin, parallel to main cutting edge and
Cross origin O straight line be reference axis X plane in, main cutting edge straightway on reference axis X and main cutting edge straightway with
Vertical range L2 is 2%-4%D between axis X.
Preferably, the central cutting sword (16) that is obtained after the fluted drill web thinning and main cutting edge straightway (13) it
Between there is negative included angle X, it is no more than 5 ° to bear included angle X size.
Preferably, the central cutting sword length L4 measured after the fluted drill web thinning in radial section is 9%-
13%D.
Preferably, the fluted drill main cutting edge is made of main cutting edge straightway and arch sword line, and in radial section
The length L3 of the main cutting edge straightway of middle measurement is 24%-29%D.
Preferably, the fluted drill web thinning rear end length L6 is 6%D, the chisel edge length measured in radial section
For 3%D.
Preferably, the counter drain groove formed after the fluted drill web thinning, the radius size R1 of the counter drain groove are
17%-21%D.
Fluted drill described in the utility model with special trench structure and web thinning structure, this groove is radially
Projection in section is a kind of structure different from existing profile, and axle center, groove profile are crossed in the exterior lateral area position of the profile
Shift to an earlier date with the intersection point of the thick circle of core.For the main cutting edge that this groove profile is formed apart from close, the cutting portion of fluted drill is horizontal in reconditioning
More preferably cutting structure can be obtained during sword.
Apex point reconditioning is carried out to the groove fluted drill, blunt apex angle can be formed, the parallel lines of two main cutting edges are positioned at brill
Vertical range within core inscribed circle and between two main cutting edges is smaller, arises from one section of cutting edge convergence straight line at outer rim turning point,
Using drill core center as origin, parallel to the cutting edge and cross the straight line of origin as in the view of reference axis, the cutting edge
On reference axis.
The utility model groove can obtain the effective of bigger compared with prior art groove under the conditions of identical core thickness
Chip shaping and chip space.The groove minimum point of the groove shifts to an earlier date, and chip shifts to an earlier date in the curling point of groove energy, makes chip
Curling is abundant, discharge is smooth.
Further, since the particularity of the utility model groove, can make what is obtained when the groove fluted drill repairing abrasive drilling is sharp
Two main cutting edges arise from the cutting edge of one section of convergence straight line at outer rim turning point, using drill core center as origin, parallel to cutting
Sword and the excessively straight line of origin is in the view of reference axis, the cutting edge are on reference axis.Apart from very little between two main cutting edges,
Small chisel edge can be readily obtained after web thinning, can effectively reduce load and axial direction that fluted drill produces in cutting
Power, can improve processing efficiency.
Web thinning mode in the utility model forms a counter drain groove, and the counter drain groove can improve near drill core
Machining condition, drill core is gone out chip larger shaping chip space, optimizes machining state.
The beneficial effects of the utility model are：
(1) fluted drill with special trench structure and web thinning structure of the utility model, chip are being arranged
Consider to be worth doing and rule is molded in groove；
(2) fluted drill with special trench structure and web thinning structure of the utility model, groove chip removal
Smoothness, frictional force is small, reduces the temperature produced in drilling process；
(3) fluted drill with special trench structure and web thinning structure of the utility model, special ditch
Groove profile uses special web thinning mode, forms special cutting blade structure, reduces negative in fluted drill drilling process
Load and axial force, improve the processing efficiency and service life of fluted drill.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the utility model front view；
Fig. 2 is fluted drill cutting portion partial enlarged view；
Fig. 3 is that Fig. 2 rotates clockwise 90 ° of views；
Fig. 4 is sectional view along A-A in Fig. 1；
Fig. 5 is B-B direction sectional view in Fig. 1；
Fig. 6 is the axial force testing result axial force F z test curves of embodiment 2；
Fig. 7 is the axial force testing result of existing product B.
In figure：1st, axis, 2, drill bit part, 3, land, 4, groove, 5, shank, 6, ditch front of the slot, 22, cutting portion, 13,
Main cutting edge straightway, 17, main cutting edge arcuate segment, 16, central cutting sword, 19, chisel edge, 40, counter drain groove, 42, land, 50,
Knife face afterwards.
Embodiment
Clear, complete description is carried out to the technical solution of the utility model with reference to the accompanying drawings and examples, in this reality
With in new description, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ", " level ",
The orientation or position relationship of the instructions such as " interior ", " outer " are based on orientation shown in the drawings or position relationship, are for only for ease of and retouch
State the utility model and simplify and describe, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.
A kind of fluted drill with special trench structure and web thinning structure, including shank 5 with it is rotating around axis 1
Cutting portion 22, the cutting portion 22 are extended spirally from the front end of the cutting portion to the shank equipped with two and cut for discharge
The groove 4 of bits, the land 3 for connecting two 4 neighboring edges of groove respectively, the groove 4 are additionally provided with the cutting portion 22
A helical angle for prolonging the extension of axis 1 be ω, groove central angle θ is 84 ° -92 °, groove that core thickness K is 16%-22%D is (as schemed
Shown in 4), between described 4 liang of outer rim turning points of groove, 11,12 lines and groove minimum point 9,10 line formed angle α for 27 °-
37 °, it arises from one section of profile, the 6 convergence straight line at the second outer rim turning point 11, using drill core center O as origin, parallel to profile 6
And the straight line for crossing origin O is in the view of reference axis X, profile 6 on reference axis X, between profile 6 and reference axis X it is vertical away from
It is 8%-11%D from L1, that section of profile radius r that the groove 4 is contacted with groove minimum point 10 is 17%-22%D.To described
4 fluted drill of groove carries out 2 reconditioning of apex point, can form blunt apex angle η, the parallel lines 14,15 of two main cutting edges are inscribed positioned at drill core
Circle 30 within, the fluted drill main cutting edge straightway 13 using drill core center O as origin, parallel to main cutting edge straightway 13
And the straight line for crossing origin O is on reference axis X and main for (as shown in Figure 5) in the view of reference axis X, main cutting edge straightway 13
Vertical range L2 is 2%-4%D between cutting edge straightway 13 and axis X；It is anxious in being obtained after the fluted drill web thinning
Cutting between sword 16 and main cutting edge straightway 13 has negative included angle X, and included angle X size is no more than 5 °；Central cutting sword length L4
(measured for 9%-13%D in radial section)；Fluted drill main cutting edge is by 17 structure of main cutting edge straightway 13 and arch sword line
Into, and straight length (L3) is 24%-29%D (being measured in radial section)；The fluted drill web thinning rear end length L6
For 6%D, chisel edge length 19 is 3%D (being measured in radial section)；The counter drain groove 40 formed after web thinning, its radius size
R1 is 17%-21%D.
Embodiment 1
1 design parameter of embodiment and experimental data for the utility model illustrated below：
| Embodiment 1 | |
| Diameter (mm) | 6.0 |
| Groove straightway and X-axis distance L1 (mm) | 0.54 |
| Core thickness K (mm) | 1.12 |
| Groove central angle θ (°) | 86 |
| Angle α (°) | 32 |
| Groove minimum point section radius r (mm) | 1.14 |
| Main cutting edge straightway and X-axis distance L2 (mm) | 0.18 |
| Main cutting edge length of straigh line L3 (mm) | 1.56 |
| Central cutting sword length L4 (mm) | 0.61 |
| Rear end length L6 (mm) | 0.37 |
| Apex angle η (°) | 135 |
| Main sword straightway and center sword included angle X (°) | 2 |
| Counter drain groove radius R1 (mm) | 1.14 |
Test one：Velocity test：
Test tool：High speed steel twist drill, material M2.
Test condition：
| Tool specification： | D6.0mm |
| Experiment examination base： | Try blank material matter：sus304；Hardness：≤187HB |
| Cutting fluid： | Nothing |
| Cutting linear velocity： | 22.62m/min |
| Load： | 18.5Kg |
| Drilling depth： | 6mm through holes |
| Test equipment： | Electric hand drill velocity test machine |
Test result：
Embodiment 1 contrasts 1 speed of existing product lifting 26.94%, 2 speed of contrast existing product lifting 46.99%, contrast
3 speed of existing product lifting 26.82%.
Embodiment 2
2 design parameter of embodiment and experimental data for the utility model illustrated below：
| Example 2 | |
| Diameter (mm) | 15.8 |
| Groove straightway and X-axis distance L1 (mm) | 1.56 |
| Core thickness K (mm) | 2.98 |
| Groove central angle θ (°) | 88 |
| Angle α (°) | 30 |
| Groove minimum point section radius r (mm) | 3.08 |
| Main cutting edge straightway and X-axis distance L2 (mm) | 0.40 |
| Main cutting edge length of straigh line L3 (mm) | 3.95 |
| Central cutting sword length L4 (mm) | 1.57 |
| Rear end length L6 (mm) | 0.93 |
| Apex angle η (°) | 135 |
| Main sword straightway and center sword included angle X (°) | 2 |
| Counter drain groove radius R1 (mm) | 3 |
Test two：Axial force testing：
As shown in Figure 6 and Figure 7, Fig. 6 is the axial force testing of embodiment 2 as a result, the axial force that Fig. 7 is existing product B is surveyed
Test result.
Test tool：High speed steel twist drill, material M2.
Test condition：
Test result：
Axial force reduction that embodiment 2 is subject to 22.76%.
Embodiment 3
A kind of fluted drill with special trench structure and web thinning structure, including shank 5 with it is rotating around axis 1
Cutting portion 22, the cutting portion 22 are extended spirally from the front end of the cutting portion to the shank equipped with two and cut for discharge
The groove 4 of bits, the land 3 for connecting two 4 neighboring edges of groove respectively, the groove 4 are additionally provided with the cutting portion 22
A helical angle for prolonging the extension of axis 1 be ω, the groove that groove central angle θ is 84 °, core thickness K is 16%D, 4 liang of the groove is outer
The angle α that line is formed between 11,12 lines of edge turning point and groove minimum point 9,10 is 27 °, it arises from the second outer rim turning point 11
One section of profile, the 6 convergence straight line at place, using drill core center O as origin, parallel to profile 6 and to cross the straight line of origin O be reference axis X
View in, for profile 6 on reference axis X, the vertical range L1 between profile 6 and reference axis X is 8%D, the groove 4 and ditch
That section of profile radius r that groove minimum point 10 contacts is 17%D.2 reconditioning of apex point is carried out to 4 fluted drill of groove, can be formed blunt
Apex angle η, the parallel lines 14,15 of two main cutting edges are located within drill core inscribed circle 30, the fluted drill main cutting edge straightway
13 using drill core center O as origin, parallel to main cutting edge straightway 13 and cross the straight line of origin O and be the view of reference axis X
(as shown in Figure 5), main cutting edge straightway 13 is on reference axis X and vertical range between main cutting edge straightway 13 and axis X
L2 is 2%D；There is negative folder between the central cutting sword 16 and main cutting edge straightway 13 that are obtained after the fluted drill web thinning
Angle λ, included angle X size are no more than 5 °；Central cutting sword length L4 is 9%D (being measured in radial section)；Fluted drill main cutting
Sword is made of main cutting edge straightway 13 and arch sword line 17, and straight length (L3) is 24%D (being measured in radial section)；
The fluted drill web thinning rear end length L6 is 6%D, and chisel edge length 19 is 3%D (being measured in radial section)；Reconditioning is horizontal
The counter drain groove 40 formed after sword, its radius size R1 are 17%D.
Embodiment 4
A kind of fluted drill with special trench structure and web thinning structure, including shank 5 with it is rotating around axis 1
Cutting portion 22, the cutting portion 22 are extended spirally from the front end of the cutting portion to the shank equipped with two and cut for discharge
The groove 4 of bits, the land 3 for connecting two 4 neighboring edges of groove respectively, the groove 4 are additionally provided with the cutting portion 22
One prolong axis 1 extension helical angle be ω, the groove (as shown in Figure 4) that groove central angle θ is 92 °, core thickness K is 22%D, institute
It is 37 ° to state the angle α that line is formed between 4 liang of outer rim turning points of groove, 11,12 lines and groove minimum point 9,10, it arises from second
One section of profile, 6 convergence straight line at outer rim turning point 11, using drill core center O as origin, parallel to profile 6 and cross the straight of origin O
Line is in the view of reference axis X, and profile 6 is on reference axis X, and the vertical range L1 between profile 6 and reference axis X is 11%D, institute
It is 22%D to state that section of profile radius r that groove 4 is contacted with groove minimum point 10.Apex point 2 is carried out to 4 fluted drill of groove to repair
Mill, can form blunt apex angle η, the parallel lines 14,15 of two main cutting edges are located within drill core inscribed circle 30, and the fluted drill master cuts
Sword straightway 13 is cut using drill core center O as origin, parallel to main cutting edge straightway 13 and cross the straight line of origin O as reference axis
In the view of X (as shown in Figure 5), main cutting edge straightway 13 is on reference axis X and between main cutting edge straightway 13 and axis X
Vertical range L2 is 4%D；Between the central cutting sword 16 and main cutting edge straightway 13 that are obtained after the fluted drill web thinning
With negative included angle X, included angle X size is no more than 5 °；Central cutting sword length L4 is 13%D (being measured in radial section)；Fiber crops
Flower bores main cutting edge and is made of main cutting edge straightway 13 and arch sword line 17, and straight length (L3) (cuts for 29%D in radial direction
Measured in face)；The fluted drill web thinning rear end length L6 is 6%D, and chisel edge length 19 (is surveyed for 3%D in radial section
Amount)；The counter drain groove 40 formed after web thinning, its radius size R1 are 21%D.
The fluted drill with special trench structure and web thinning structure of the utility model, chip is in chip space
Middle shaping rule, groove chip removal is smooth, and frictional force is small, reduces the temperature produced in drilling process, and special groove profile uses
Special web thinning mode, forms special cutting blade structure, reduces the load in fluted drill drilling process and axial direction
Power, improves the processing efficiency and service life of fluted drill.The utility model is suitable for bit technique field under core, has wide
Use prospect.
The above, is only the preferable embodiment of the utility model, but the scope of protection of the utility model and not
This is confined to, any one skilled in the art is in the technical scope that the utility model discloses, according to this practicality
New technical solution and its utility model design are subject to equivalent substitution or change, all cover in the scope of protection of the utility model
Within.
Claims (9)
- A kind of 1. fluted drill with special trench structure and web thinning structure, it is characterised in that：Including shank (5) with around Axis (1) rotating cutting portion (22), the first sword line (14) and the second sword line (15) of the main cutting edge being parallel to each other all are located at Within drill core inscribed circle (30), the cutting portion (22) is equipped with two from the front end of the cutting portion (22) to the shank (5) groove (4) for discharging chip is extended spirally, two grooves of connection respectively are additionally provided with the cutting portion (22) (4) land (3) on neighboring edge, fluted drill outside diameter are D, and the groove (4) has the drill core thickness K of 16%~22%D And 84 °~92 ° groove central angle θ；Line and first groove minimum point (9) between the first outer rim turning point (12) and the second outer rim turning point (11) of the groove (4) Line forms angle α between second groove minimum point (10).
- 2. according to the fluted drill with special trench structure and web thinning structure described in claim 1, its feature exists In：Line and first groove minimum point (9) and the between (4) the first outer rim turning point (12) of groove and the second outer rim turning point (11) The angle α that line is formed between two groove minimum points (10) is 27 °~37 °；One section of profile (6) curvature that the groove (4) arises from second outer rim turning point (11) place is less than 0.05, and reference axis X is to bore Core center O is origin and the straight line of origin O is crossed parallel to profile (6), and profile (6) is on reference axis X, profile (6) and coordinate Vertical range L1 between axis X is 8%~11%D；The groove and that section of profile radius r of the minimum point contact of groove are 17%-22%D.
- 3. according to the fluted drill with special trench structure and web thinning structure described in claim 2, its feature exists In：Apex point reconditioning is carried out to the groove (4), forms blunt apex angle η, the first sword line (14) of the main cutting edge being parallel to each other and the Two sword lines (15) are located within drill core inscribed circle (30).
- 4. according to the fluted drill with special trench structure and web thinning structure described in claim 3, its feature exists In：The main cutting edge straightway (13) of the fluted drill using drill core center O as origin, parallel to main cutting edge straightway (13) And the straight line for crossing origin O is that main cutting edge straightway (13) is on reference axis X and main cutting edge is straight in the plane of reference axis X Line segment (13) vertical range L2 between axis X is 2%-4%D.
- 5. according to the fluted drill with special trench structure and web thinning structure described in claim 3, its feature exists In：There is negative angle between the central cutting sword (16) and main cutting edge straightway (13) that are obtained after the fluted drill web thinning λ, it is no more than 5 ° to bear included angle X size.
- 6. according to the fluted drill with special trench structure and web thinning structure described in claim 3, its feature exists In：The central cutting sword length L4 measured after the fluted drill web thinning in radial section is 9%-13%D.
- 7. according to the fluted drill with special trench structure and web thinning structure described in claim 3, its feature exists In：The fluted drill main cutting edge is made of main cutting edge straightway (13) and arch sword line (17), and is surveyed in radial section The length L3 of the main cutting edge straightway (13) of amount is 24%-29%D.
- 8. according to the fluted drill with special trench structure and web thinning structure described in claim 3, its feature exists In：The fluted drill web thinning rear end length L6 is 6%D, and the chisel edge length measured in radial section (19) is 3%D.
- 9. according to the fluted drill with special trench structure and web thinning structure described in claim 3, its feature exists In：The counter drain groove (40) formed after the fluted drill web thinning, the radius size R1 of the counter drain groove (40) is 17%-21% D。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721098765.9U CN207288981U (en) | 2017-08-30 | 2017-08-30 | A kind of fluted drill with special trench structure and web thinning structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721098765.9U CN207288981U (en) | 2017-08-30 | 2017-08-30 | A kind of fluted drill with special trench structure and web thinning structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207288981U true CN207288981U (en) | 2018-05-01 |
Family
ID=62438291
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721098765.9U Active CN207288981U (en) | 2017-08-30 | 2017-08-30 | A kind of fluted drill with special trench structure and web thinning structure |
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| Country | Link |
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| CN (1) | CN207288981U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108608040A (en) * | 2018-05-10 | 2018-10-02 | 大连理工大学 | For composite material and its micro- serrated knife tool of the double ladders of the perpendicular sword of laminated construction high quality drilling |
| CN111250762A (en) * | 2020-03-20 | 2020-06-09 | 常州机电职业技术学院 | Drill bit convenient for detecting turning point of chisel edge during grinding and manufacturing method thereof |
-
2017
- 2017-08-30 CN CN201721098765.9U patent/CN207288981U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108608040A (en) * | 2018-05-10 | 2018-10-02 | 大连理工大学 | For composite material and its micro- serrated knife tool of the double ladders of the perpendicular sword of laminated construction high quality drilling |
| CN108608040B (en) * | 2018-05-10 | 2020-04-07 | 大连理工大学 | Vertical-edge double-step micro-tooth cutter for high-quality hole making of composite material and laminated structure of composite material |
| CN111250762A (en) * | 2020-03-20 | 2020-06-09 | 常州机电职业技术学院 | Drill bit convenient for detecting turning point of chisel edge during grinding and manufacturing method thereof |
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