CN208495882U - A kind of PCB boring bar tool - Google Patents
A kind of PCB boring bar tool Download PDFInfo
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- CN208495882U CN208495882U CN201820796488.7U CN201820796488U CN208495882U CN 208495882 U CN208495882 U CN 208495882U CN 201820796488 U CN201820796488 U CN 201820796488U CN 208495882 U CN208495882 U CN 208495882U
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- tapered section
- boring bar
- drill lip
- bar tool
- angle
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Abstract
The utility model is suitable for PCB drill bit design field, provide a kind of PCB boring bar tool, including drill lip, there are two main cutting edges for drill lip tool, two main chip spaces and chisel edge, each main cutting edge is symmetrical arranged with respect to the axle center of drill lip, each main chip space respectively corresponds each main cutting edge and is arranged along the front end of drill lip to rear screw, each main cutting edge all has flank, the chisel edge is the cutting edge that two flanks are crossed to form, two main cutting edges are connected by chisel edge, two main cutting edges are provided with the both ends positioned at chisel edge and relative to the centrosymmetric pilot trench of chisel edge, each pilot trench, which is respectively communicated with, to be come together in each main chip space and ends at joint.A kind of PCB boring bar tool provided by the utility model, its sharpness that boring bar tool drill lip can be improved, solve the problems, such as occur burr, drill lip wrapping in process hole, the integral rigidity of drill lip also can be improved, enhance the bend resistance ability of drill bit, while boring bar tool can also be protected in the positioning accuracy for cutting process.
Description
Technical field
The utility model belongs to PCB drill bit design field more particularly to a kind of PCB boring bar tool.
Background technique
In Design of Digital System, with the continuous improvement of wiring density and clock frequency, signal integrity is simultaneous with electromagnetism
The problems such as appearance, is further prominent；Plated-through-hole in PCB manufacturing process is can be used as in fact from the point of view of being route, the ends of certain plated-through-holes without
Connection, the fold-back resonance that will lead to signal is mitigated, is likely to result in reflection, scattering, the delay etc. of signal transmission, gives signal by this
The problem of bringing " distortion ", to influence the integrality of signal transmission.As the speed of digital data transmission is getting faster, frequency
Higher and higher, back drill technology is with more and more extensive on high-frequency circuit board, but back drill technology will appear back in process
The various problems such as drilling inclined, hole inner burr, drill wrapping, the overproof, breaking of depth, influence processing quality, mesoporous inner burr goes out
Existing frequency head occupies first.
Utility model content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of PCB boring bar tool, can
The sharpness for improving boring bar tool drill lip, solves the problems, such as occur burr, drill lip wrapping in process hole, drill lip also can be improved
Integral rigidity, enhance the bend resistance ability of drill bit, while boring bar tool can also be protected in the positioning accuracy for cutting process.
The technical solution of the utility model is: a kind of PCB boring bar tool, including drill lip, and there are two masters to cut for the drill lip tool
Sword, two main chip spaces and chisel edge are cut, the axle center of each relatively described drill lip of the main cutting edge is symmetrical arranged, each main chip removal
Slot respectively corresponds each main cutting edge and is arranged along the front end of the drill lip to rear screw, after each main cutting edge all has
Knife face, the chisel edge are the cutting edge that two flanks are crossed to form, and two main cutting edges are connected by the chisel edge,
Two main cutting edges are provided with the both ends positioned at the chisel edge and relative to the centrosymmetric pilot trench of the chisel edge, each institutes
It states pilot trench and is respectively communicated with and come together in each main chip space and end at joint.
Specifically, the pilot trench is straight-line groove, and the pilot trench and the intersection of the flank are arc-shaped.
Specifically, the chisel edge has chisel edge anterior angle and the chisel edge anterior angle is 3 ° -20 °.
Specifically, it is provided with cutting tooth in the flank of each drill lip, the cutting tooth has the first face angle and the
Dihedral angle, first face angle is relative to second face angle close to the center of the drill lip front end.
Specifically, the angle of first face angle is 5 ° -20 °, and the angle of second face angle is 10 ° -40 °.
Specifically, the circumscribed circle diameter of the cutting tooth is the 60%-95% of the drill lip outside diameter.
Specifically, the sword valve between the adjacent main chip space is provided with land, and the land is located on the sword valve
Close to the rake face side of the main cutting edge.
Specifically, the axial height of each land is the 10%-20% of the drill lip outer circumference.
Specifically, the drill lip have along its axially extending drill core, the drill core be include the first tapered section and second
The two-part pyramidal structure of tapered section, the cone angle of first tapered section are greater than the cone angle of second tapered section, and described first
The rear end of tapered section is connected to the front end of second tapered section.
Specifically, taper Taper1=(K2-K1)/L1 of first tapered section, the taper of second tapered section
The taper of Taper2=(K3-K2)/L2, the taper of first tapered section and second tapered section is in 0.01-0.05 model
In enclosing, wherein K1 is the diameter of first tapered section front end, and K2 is the diameter of first tapered section rear end, and K3 is described
The diameter of second tapered section rear end, L1 are the length of first tapered section, and L2 is the length of the second tapered section.
A kind of PCB boring bar tool provided by the utility model is designed by the pilot trench of apex point, is improved in the middle part of apex point
The fluency of sharpness and chip removal solves the problems, such as that drill lip wrapping occurs in drilling process；Pass through counter blade mark little progress row
Optimization design guarantees the finish of hole wall, avoids the appearance of hole inner burr；It is set by the way that drill lip core diameter is made two-part core thickness taper
Meter improves the integral rigidity of drill bit, enhances the bend resistance ability of drill bit under the premise of guaranteeing cutting and chip removal ability, drops
Low disconnected sword risk extends the service life of drill bit, and may also be ensured that boring bar tool in the positioning accuracy for cutting process, it is ensured that produces
The processing quality of product.
Detailed description of the invention
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of main view of PCB boring bar tool provided by the embodiment of the utility model；
Fig. 2 is a kind of left view of PCB boring bar tool provided by the embodiment of the utility model；
Fig. 3 is the structure of the first face angle and the second face angle in a kind of PCB boring bar tool provided by the embodiment of the utility model
Schematic diagram；
Fig. 4 is drill core structural schematic diagram in a kind of PCB boring bar tool provided by the embodiment of the utility model；
Fig. 5 is the enlarged diagram that A goes out in Fig. 4.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or it may be simultaneously present centering elements.When an element is known as " being connected to " another element, it can
To be directly to another element or may be simultaneously present centering elements.
It is only each other relatively it should also be noted that, the positional terms such as left and right, upper and lower in the utility model embodiment
Concept or be reference with the normal operating condition of product, and should not be regarded as restrictive.
As depicted in figs. 1 and 2, a kind of PCB boring bar tool provided by the embodiment of the utility model, including drill lip 1, drill lip 1
It is used to carry out the part of drilling processing for boring bar tool, there are two main cutting edge 11, two main 12 and of chip space for the tool of drill lip 1
The axle center of chisel edge 13, each relatively described drill lip 1 of the main cutting edge 11 is symmetrical arranged, and each main chip space 12 respectively corresponds respectively
The main cutting edge 11 is simultaneously arranged along the front end of the drill lip 1 to rear screw, and two main chip spaces 12 are also with respect to the axis of drill lip 1
The heart is symmetrical, and each main cutting edge 11 all has flank 14, and flank 14 is face opposite with surface to be machined on drill lip 1,
The chisel edge 13 is the cutting edge that is crossed to form of two flanks 14, chisel edge 13 be located at the front end of drill lip 1 at first with added
Work plane contact plays certralizing ability, and the center of chisel edge 13 is overlapped with the axle center of drill lip 1, and two main cutting edges 11 pass through institute
It states chisel edge 13 to be connected, two main cutting edges 11 are provided with the both ends positioned at the chisel edge 13 and relative to the chisel edge 13
Centrosymmetric pilot trench 2, each pilot trench 2, which is respectively communicated with, to be come together in each main chip space 12 and ends at joint, i.e., often
The pilot trench 2 of a main cutting edge 11 extends toward the rear end of drill lip 1 and is intersected in main chip space 12 corresponding with the main cutting edge 11,
And each pilot trench 2 stops after crossing.By pilot trench 2 about 13 symmetric design of chisel edge, is guaranteeing 1 rigidity of drill lip and there is enough chip removals
Under the premise of space, effectively shorten the length of chisel edge 13, to improve the sharpness at 11 middle part of main cutting edge, becomes cutting
It is smooth, drill bit can be efficiently solved and the problem of 1 wrapping of drill lip occur in drilling.Resistance when drilling can also be reduced, bored
Hole tool is avoided that sliding knife when cutting positioning, to guarantee the positioning accuracy in boring procedure hole location, improves product quality, and
The design of pilot trench 2 also helps the discharge of chip when chisel edge 13 is cut.
Specifically, as shown in Figure 1, the pitch angle gamma of two main chip spaces 12 is identical, and two main chip spaces
12 are symmetrical arranged relative to 1 axle center of drill lip, and main chip space 12 is conducive to for drilling cuttings being discharged, and guarantee that drilling is smooth.Two institutes
The pitch angle gamma for stating main chip space 12 is 15 ° -45 °, is optimized to the pitch angle gamma of main chip space 12, can be effectively
Boring bar tool entirety chip removal performance is improved, while can also realize in drilling process and effectively radiate, avoids cutting process
1 temperature of drill lip is excessively high.
Specifically, the pitch angle gamma of two main chip spaces 12 is 20 ° -40 °, in the utility model embodiment, main row
The pitch angle gamma for considering slot 12 to be worth doing is 40 ° ± 2 °.
Specifically, as shown in Figure 1 and Figure 5, the pilot trench 2 is straight-line groove, avoids the metallic matrix cut off when grinding pilot trench 2
Excessively boring procedure is caused to deflect, and the pilot trench 2 and the intersection 15 of the flank are arc-shaped, by opening for pilot trench 2
Mouth design camber, increases the opening of pilot trench 2, guarantees that chip is smoothly discharged, while being also conducive to grinding and forming.
Specifically, the chisel edge 13 has chisel edge anterior angle (not shown) and the chisel edge anterior angle is 3 ° -20 °, to cross
Angle of cutting edge optimizes, and can be effectively reduced being squeezed in drilling of chisel edge 13 and cause very big axial force,
Ensure that drilling process centering is stablized.
Specifically, the chisel edge anterior angle is 5 ° -15 °, in the utility model embodiment, the angle of the chisel edge anterior angle is 8 ° ±
2°。
Specifically, as shown in figure 3, being provided with cutting tooth 16 in the flank 14 of each drill lip 1, the cutting tooth 16
With the first face angle a and the second face angle b, the first face angle a relative to the second face angle b close to 1 front end of drill lip
Center, the angle of the first face angle a are 5 ° -20 °, and the angle of the second face angle b is 10 ° -40 °.Two cutting tooths
16 is arranged symmetrically about 180 ° of 1 center of drill lip, further increases the cutting sharpness of drill lip 1, pcb board is avoided to produce in process
Setation thorn.
In practical application, the preferred scope of the first face angle a angle is in 10 ° -15 °, the preferred scope of the second face angle b angle
In 20 ° -30 °.
Specifically, as shown in Fig. 2, the circumscribed circle diameter d of the cutting tooth 16 is the 60%- of the 1 outside diameter D of drill lip
95%.
Specifically, as shown in Figure 1, the angle of 1 apex angle δ of the drill lip is 90 ° -180 °, apex angle δ refers to that two masters cut
Cut sword 11 projected in circumferential plane in parallel between angle, optimized, be conducive into one by vertical angles δ
Step improves the synthesis cutting ability of drill lip 1.
Specifically, the angle preferred scope of the 1 apex angle δ of drill lip is 110 ° -160 °, in the utility model embodiment, top
The machining angle of angle δ is 120 ° ± 5 °.
Specifically, as shown in Figure 1, the sword valve between the adjacent main chip space 12 is provided with land 3, land 3 is located at
On sword valve before the main cutting edge 11 side, sword valve refers to main chip space 12 is cut off in 1 outer rim of drill lip after remaining part.
Specifically, as shown in Figure 1, the rake face side of the separate main cutting edge 11 of the land 3 forms land through grinding
17, land 17 is lower than the outer fringe surface of land 3, and the design of land 17 makes drill lip 1 and hole wall form radial clearance, prevents from rubbing,
To improve machining accuracy, cutting force is reduced.
Specifically, the axial height of each land 3 is the 10%-20% of 1 outer circumference of drill lip, the axis of land 3
To the trajectory distance for highly referring to that land 3 extends in a circumference inside spin, 1 outer circumference of drill lip is the circumscribed circle of drill lip 1
Perimeter π D, D are external diameter of a circle, optimize to the size of land 3, are further ensured that hole wall is bright and clean, improve hole location
Quality.
Specifically, margin width L3 is the 1%-5% of 1 outer circumference of drill lip.
Specifically, it as shown in Fig. 2, defining the relief angle at the neighboring of drill lip 1 is outer relief angle α, i.e., is cut based on outer relief angle α
Cut the relief angle of 11 flank outermost edges of sword, the angle of outer relief angle α is 5 ° -40 °, and external relief angle α is optimized, can be with
Friction is effectively reduced, chip space is increased.
In the utility model embodiment, the preferred scope of outer relief angle α angle is in 10 ° -30 °.
In practical application, as shown in Fig. 2, the drill lip 1 also has preceding angle beta.
Specifically, as shown in figure 4, the drill lip 1 have along its axially extending drill core, the drill core be include first cone
The two-part pyramidal structure of section 41 and the second tapered section 42 is spent, drill core is along wimble structure, i.e. the diameter of drill core is past from apex point position
After be gradually increased, the cone angle of first tapered section 41 is greater than the cone angle of second tapered section 42, first tapered section 41
Rear end connect with the front end of second tapered section 42.Taper Taper1=(K2-K1)/L1 of first tapered section 41,
Taper Taper2=(K3-K2)/L2 of second tapered section 42, the taper of first tapered section 41 and second taper
The taper of section 42 is within the scope of 0.01-0.05, wherein K1 is the diameter of 41 front end of the first tapered section, and K2 is described the
The diameter (or K2 is the diameter of 42 front end of the second tapered section) of one tapered section, 41 rear end, K3 is 42 rear end of the second tapered section
Diameter, L1 be first tapered section 41 length, L2 be the second tapered section 42 length.It is set using two-part pyramidal structure
Meter, optimizes the structure of drill core, on the one hand cuts process with preferable rigidity in processing in guarantee drill lip 1 and determines
Position precision, improves the dimensional accuracy of drilling；On the other hand under the premise of guaranteeing cutting and chip removal ability, the cone of apex point can be made
Angle becomes much larger, to improve the integral rigidity of boring bar tool, enhances the bend resistance ability of boring bar tool, reduces disconnected sword risk,
It prolongs its service life.
A kind of PCB boring bar tool provided by the utility model embodiment is designed by the pilot trench 2 of apex point, improves brill
The sharpness at sharp middle part and the fluency of chip removal, solve the problems, such as that 1 wrapping of drill lip occurs in drilling process；By to land
3 size optimizes, and guarantees the finish of hole wall, avoids the appearance of hole inner burr；By the way that 1 core diameter of drill lip is made two sections
Formula core thickness taper design improves the integral rigidity of drill bit under the premise of guaranteeing cutting and chip removal ability, enhances the anti-of drill bit
Bending ability reduces disconnected sword risk, extends the service life of drill bit, and may also be ensured that boring bar tool in the positioning for cutting process
Precision, it is ensured that the processing quality of product.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modification, equivalent replacement or improvement etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of PCB boring bar tool, including drill lip, there are two main cutting edge, two main chip spaces and chisel edges for the drill lip tool, respectively
The axle center of the relatively described drill lip of the main cutting edge is symmetrical arranged, and each main chip space respectively corresponds each main cutting edge simultaneously
It is arranged along the front end of the drill lip to rear screw, each main cutting edge all has flank, after the chisel edge is two described
The cutting edge that knife face is crossed to form, two main cutting edges are connected by the chisel edge, which is characterized in that two main cuttings
Sword is provided with the both ends positioned at the chisel edge and relative to the centrosymmetric pilot trench of the chisel edge, and each pilot trench is respectively communicated with
It comes together in each main chip space and ends at joint.
2. a kind of PCB boring bar tool as described in claim 1, which is characterized in that the pilot trench is straight-line groove, and the pilot trench
It is arc-shaped with the intersection of the flank.
3. a kind of PCB boring bar tool as described in claim 1, which is characterized in that the chisel edge has chisel edge anterior angle and described
Chisel edge anterior angle is 3 ° -20 °.
4. a kind of PCB boring bar tool as described in claim 1, which is characterized in that be respectively provided in the flank of each drill lip
There is cutting tooth, the cutting tooth has the first face angle and the second face angle, and first face angle is close relative to second face angle
The center of the drill lip front end.
5. a kind of PCB boring bar tool as claimed in claim 4, which is characterized in that the angle of first face angle is 5 ° -20 °,
The angle of second face angle is 10 ° -40 °.
6. a kind of PCB boring bar tool as claimed in claim 5, which is characterized in that the circumscribed circle diameter of the cutting tooth is institute
State the 60%-95% of drill lip outside diameter.
7. a kind of PCB boring bar tool as described in claim 1, which is characterized in that the sword valve between the adjacent main chip space
It is provided with land, the land is located at the rake face side on the sword valve close to the main cutting edge.
8. a kind of PCB boring bar tool as claimed in claim 7, which is characterized in that the axial height of each land is described
The 10%-20% of drill lip outer circumference.
9. a kind of PCB boring bar tool as described in claim 1, which is characterized in that the drill lip has axially extending along its
Drill core, the drill core are the two-part pyramidal structure for including the first tapered section and the second tapered section, the cone of first tapered section
Angle is greater than the cone angle of second tapered section, and the rear end of first tapered section is connected to the front end of second tapered section.
10. a kind of PCB boring bar tool as claimed in claim 9, which is characterized in that the taper Taper1 of first tapered section
=(K2-K1)/L1, taper Taper2=(K3-K2)/L2 of second tapered section, the taper of first tapered section and institute
The taper of the second tapered section is stated within the scope of 0.01-0.05, wherein K1 is the diameter of first tapered section front end, and K2 is
The diameter of first tapered section rear end, K3 are the diameter of second tapered section rear end, and L1 is the length of first tapered section
Degree, L2 are the length of the second tapered section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820796488.7U CN208495882U (en) | 2018-05-28 | 2018-05-28 | A kind of PCB boring bar tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820796488.7U CN208495882U (en) | 2018-05-28 | 2018-05-28 | A kind of PCB boring bar tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208495882U true CN208495882U (en) | 2019-02-15 |
Family
ID=65294042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820796488.7U Active CN208495882U (en) | 2018-05-28 | 2018-05-28 | A kind of PCB boring bar tool |
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| Country | Link |
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| CN (1) | CN208495882U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170686A (en) * | 2019-05-07 | 2019-08-27 | 深圳市金洲精工科技股份有限公司 | A kind of microbit |
| CN114713884A (en) * | 2020-12-22 | 2022-07-08 | 上海飞机制造有限公司 | Ultrasonic vibration drilling tool |
-
2018
- 2018-05-28 CN CN201820796488.7U patent/CN208495882U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170686A (en) * | 2019-05-07 | 2019-08-27 | 深圳市金洲精工科技股份有限公司 | A kind of microbit |
| CN114713884A (en) * | 2020-12-22 | 2022-07-08 | 上海飞机制造有限公司 | Ultrasonic vibration drilling tool |
| CN114713884B (en) * | 2020-12-22 | 2023-05-26 | 上海飞机制造有限公司 | Ultrasonic vibration drilling tool |
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