CN102294505B - Mother-and-son edge microbit and processing method thereof - Google Patents
Mother-and-son edge microbit and processing method thereof Download PDFInfo
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- CN102294505B CN102294505B CN 201110226121 CN201110226121A CN102294505B CN 102294505 B CN102294505 B CN 102294505B CN 201110226121 CN201110226121 CN 201110226121 CN 201110226121 A CN201110226121 A CN 201110226121A CN 102294505 B CN102294505 B CN 102294505B
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Abstract
The invention discloses a mother-and-son edge microbit and a processing method thereof. The mother-and-son edge microbit comprises a main cutting edge and an assistant cutting edge, wherein the main cutting edge and the assistant cutting edge of the mother-and-son edge microbit are respectively provided with at least one rear cutter face, and the included angle between the first rear cutter face of the main cutting edge and a processing plane is smaller than the included angle between the first rear cutter face of the assistant cutting edge and the processing plane. In order to enable the included angle between the first rear cutter face of the main cutting edge and the processing plane to be smaller than the included angle between the first rear cutter face of the assistant cutting edge and the processing plane, the first rear cutter face of the assistant cutting edge is lower than the first rear cutter face of the main cutting edge when the microbit rotates, interference to the main cutting edge can not be generated at the formed chisel edge part, axial force is reduced, the possibility of friction and loss is reduced, and the rigidity intensity of the microbit is improved.
Description
Technical field
The present invention relates to the printed circuit board (PCB) manufacturing field of (being called for short PCB), in particular, relate to a kind of primary and secondary sword microbit and processing method thereof.
Background technology
Along with the development of printed circuit board (pcb) technology and product, the carbide drill demand increases year by year, and the novel hard alloy drill bit constantly occurs, and is also more and more higher to the requirement of carbide drill.PCB is a kind of complex-shaped band spiral fluted capillary processing instrument with carbide drill (being called for short the PCB microbit), is derived by traditional fluted drill.PCB microbit size is small, and its apex point structure will just can be observed by light microscope.Present most of PCB producer uses numerical control drilling machine to come the processing PCB plate, and digital control hole drilling is the important step of printed board processing procedure, and carbide drill then is the key factor that determines drilling quality and efficient.
The client is more and more higher to properties of product, the quality requirements of PCB drill bit, and conventional products can not be met customer need.As shown in Figure 1-Figure 3, the PCB drill bit of using always at present all is chip area 10, two symmetrical groups major first flank 12 and the second back knife face 13 that 11, two symmetrical spirals of cutting edge of two symmetries are arranged usually.Along with the brill of microbit directly require more and more littler, the bradawl easy breaking of rod on first watch, and conventional bit two helicla flute forms have weakened the drill bit rigidity, it is better to press for a kind of rigidity intensity, especially the better microbit of rigidity intensity under the condition of bradawl footpath.
Summary of the invention
Technical problem to be solved by this invention provides a kind of rigidity intensity better primary and secondary sword microbit and processing method thereof.
The objective of the invention is to be achieved through the following technical solutions:
A kind of primary and secondary sword microbit comprises a main cutting edge and a front cutting edge; Wherein, the main cutting edge of described primary and secondary sword microbit and front cutting edge respectively have at least one back knife face, and the major first flank of described main cutting edge and the angle between the processing plane are less than the major first flank of front cutting edge and the angle between the processing plane; Described main cutting edge also is provided with one second back knife face and one the 3rd back knife face, described front cutting edge also is provided with one second back knife face, and the 3rd back knife face of described main cutting edge is arranged between the major first flank of second back knife face and front cutting edge of main cutting edge; Form secondary chisel edge between the 3rd back knife face of described main cutting edge and the major first flank of front cutting edge; Form main chisel edge between the second back knife face of front cutting edge and the major first flank of main cutting edge, the angle between described main chisel edge and the processing plane is less than the angle between secondary chisel edge and the processing plane.
Described main cutting edge and front cutting edge are positioned at along on the same surfaces of revolution of rotating shaft.The stability of such microbit is better, and can directly process on common existing fluted drill, and processing technology is changed littler.
Knife face after described main cutting edge has three, knife face after described front cutting edge has two.Such primary and secondary sword can directly be processed by existing fluted drill simply and easily, and is easy to process, and cutting effect is also fine.
Described primary and secondary sword microbit has a main chip area corresponding with main cutting edge and a secondary chip area corresponding with front cutting edge, and the length of described main chip area is longer than the length of secondary chip area.Such design is because the length of main cutting edge is longer than front cutting edge, though therefore front cutting edge also produces shear action, but the smear metal of its generation is less than the smear metal that main cutting edge produces, therefore, contraction in length with the secondary chip area of front cutting edge, can't influence the chip removal effect, but also it is thick suitably to thicken the core that the drill body part after secondary chip area stops divides, strengthens the intensity of microbit.
The afterbody of described secondary chip area crosses in main chip area.Such design can be optimized the chip removal effect of secondary chip area.
The thick core less than the front cutting edge part of the core of the main cutting edge of the apex point part of described primary and secondary sword microbit is thick.Such design makes that the core thickness rate is more solid, can improve the hole site precision.
Described main cutting edge has a plurality of backs knife face; Described front cutting edge also has a plurality of backs knife face, and the angle between described a plurality of back knife faces and the processing plane increases along direction of rotation successively from major first flank.A plurality of backs knife face reduces gradually, can avoid the interference in the drilling process better.
A kind of processing method of primary and secondary sword microbit may further comprise the steps:
Process main cutting edge and the front cutting edge of primary and secondary sword microbit, make the major first flank of main cutting edge and the angle between the processing plane less than the major first flank of front cutting edge and the angle between the processing plane.
A kind of processing method of primary and secondary sword microbit may further comprise the steps:
A: the apex point part that processes conventional fluted drill at bar;
B: bar is rotated to an angle, between the major first flank of second back knife face and opposite side of a side cutting edge, adopt the sharpening emery wheel to grind the 3rd back knife face; Part between the major first flank of the 3rd back knife face and opposite side cutting edge of a described side cutting edge forms secondary chisel edge and front cutting edge, makes the major first flank of described main cutting edge and the angle between the processing plane less than the major first flank of front cutting edge and the angle between the processing plane.
The present invention is because for making the major first flank of main cutting edge and the angle between the processing plane less than the major first flank of front cutting edge and the angle between the processing plane, namely make microbit when rotated, the major first flank of front cutting edge is lower than the major first flank of main cutting edge, can not produce main cutting edge in the chisel edge part that forms and interfere, reduced axial force, reduce the possibility of friction and loss, improved the rigidity intensity of microbit.
Description of drawings
Fig. 1 is the apex point schematic diagram of prior art;
Fig. 2 is the drill bit profile of prior art;
Fig. 3 is the overall structure schematic diagram of prior art;
Fig. 4 is the structural representation of the apex point of an embodiment of the present invention;
Fig. 5 is the drill bit profile of an embodiment of the present invention;
Fig. 6 is the overall structure schematic diagram of an embodiment of the present invention;
Fig. 7 is the knife edge included angle schematic diagram of an embodiment of the present invention;
Fig. 8 is the schematic diagram that the secondary chip area of an embodiment of the present invention incorporates main chip area;
Fig. 9 is another embodiment apex point schematic diagram of the present invention.
Wherein: 5, processing plane; 7, main chip area; 8, secondary chip area; 10, chip area;
11, main cutting edge; 12, front cutting edge; 13, main chisel edge; 14, secondary chisel edge, 21, the major first flank of main cutting edge; 22, second of the main cutting edge back knife face; 23, the 3rd of main cutting edge the back knife face; 24, the major first flank of front cutting edge; 25, second of the front cutting edge back knife face.
The specific embodiment
Primary and secondary sword microbit described in the embodiment of the invention mainly comprises a main cutting edge (female sword) and a front cutting edge (sub-sword); Wherein, the main cutting edge of described primary and secondary sword microbit and front cutting edge respectively have at least one back knife face, the major first flank of described main cutting edge and the angle between the processing plane are less than the major first flank of front cutting edge and the angle between the processing plane, namely make microbit when rotated, the major first flank of front cutting edge is lower than the major first flank of main cutting edge, can not produce main cutting edge in the chisel edge part that forms and interfere, reduced axial force, reduce the possibility of friction and loss, improved the rigidity intensity of microbit.Process above-mentioned primary and secondary sword microbit, only need process its main cutting edge and front cutting edge, and make the major first flank of main cutting edge and the angle between the processing plane get final product less than the major first flank of front cutting edge and the angle between the processing plane.
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
Embodiment one:
Shown in Fig. 4-7, the apex point of primary and secondary sword microbit has 11, one front cutting edges 12 of a main cutting edge, a main chisel edge 13 and a secondary chisel edge 14.Described main cutting edge and front cutting edge are positioned at along on the same surfaces of revolution of rotating shaft, and namely the curve at described main cutting edge and front cutting edge place is along unbearable symmetric design.Knife face after described main cutting edge 11 has 3 is respectively: the 3rd back knife face 23 of the second back knife face 22 of the major first flank 21 of main cutting edge, main cutting edge and main cutting edge.Knife face after front cutting edge 12 has two is respectively: the second back knife face 25 of the major first flank 24 of front cutting edge and front cutting edge.The second back knife face 25 of the major first flank 21 of the main cutting edge of main cutting edge 11 and the front cutting edge of front cutting edge 12 crosses and forms main chisel edge 13; The 3rd back knife face 23 of main cutting edge is arranged between the major first flank 24 of front cutting edge of second back knife face 22 and front cutting edge 12 of main cutting edge of main cutting edge, the 3rd back knife face 23 of main cutting edge and the major first flank 24 of the front cutting edge secondary chisel edge 13 of formation that crosses.The major first flank 21 of the main cutting edge of main cutting edge 11 and the angle between the processing plane 5 are less than the major first flank 24 of the front cutting edge of front cutting edge 12 and the angle between the processing plane 5, when drill bit carries out operation, the major first flank 24 of the front cutting edge of front cutting edge 12 is lower than the major first flank of the main cutting edge of main cutting edge, thereby 14 pairs of main cutting edges of main chisel edge 13 and secondary chisel edge are produced interferes, reduced axial force, reduce the possibility of friction and loss, improved the rigidity intensity of microbit.In addition, the major first flank 21 of main cutting edge and the angle of processing plane 5 are less than the second back knife face 22 of main cutting edge and the angle of processing plane 5, the second back knife face 22 of main cutting edge and the angle between the processing plane 5 are less than the 3rd back knife face 23 of main cutting edge and the angle between the processing plane 5, and namely the 3rd back knife face 23 of second of the major first flank 21 of the main cutting edge of main cutting edge 11, the main cutting edge back knife face 22 and main cutting edge and the angle between the processing plane 5 increase successively; The second back knife face 25 of the major first flank 24 of the front cutting edge of front cutting edge 12 and front cutting edge also increases successively with the angle of processing plane.And the angle between main chisel edge 13 and the processing plane is less than the angle between secondary chisel edge 14 and the processing plane, as shown in Figure 7, suppose that the angle between main chisel edge 13 and the processing plane 5 is the one jiao of degree 〥 1, secondary chisel edge 14 is the 2nd jiao of degree 〥 2 with the angle of processing plane 5, and the one jiao of degree 〥 1＜2nd jiao degree 〥 2 then arranged; Such its structure of primary and secondary sword microbit is except the 3rd back knife face 23 of main cutting edge, other parameter and existing fluted drill are similar, thereby can directly directly process from existing fluted drill, while is enhanced its cutting effect because of the setting of the 3rd back knife face 23 of its main cutting edge.
Knife face after described main cutting edge has two, even can have more backs knife face; A plurality of back knife faces of main cutting edge and the angle between the processing plane increase along direction of rotation successively from major first flank.Knife face after described front cutting edge has three also can have more backs knife face again, and a plurality of back knife faces of front cutting edge and the angle between the processing plane increase along direction of rotation successively from major first flank.A plurality of backs knife face reduces gradually, can avoid the interference in the drilling process better.As shown in FIGS. 6 to 8, the little drilling tool of primary and secondary sword have one with main cutting edge 11 to the corresponding secondary chip area 8 of corresponding main chip area 7 and and front cutting edge 12, the length of main chip area 7 is greater than the length of secondary chip area 8, and namely secondary chip area 8 incorporates main chip area 7 after boring body spiral certain distance.Because the sword of front cutting edge 12 is long shorter, the smear metal that produces during cutting is less, so with the contraction in length of secondary chip area 8 and incorporate the effect that main chip area 7 can't influence chip removal, because stopping the part of back brill body, secondary chip area cancelled secondary chip area 8 simultaneously, make that boring core thickness in this part obtains strengthening, and has improved the intensity of drill bit.Certainly, described secondary chip area 8 also can be behind a segment distance directly stops, and only this primary and secondary sword microbit is with respect to the contraction in length of secondary chip area 8 and incorporate the design of main chip area 7, and its chip removal effect is poor slightly.
Process above-mentioned primary and secondary sword microbit, only need to carry out following steps usually:
A: the apex point part that processes conventional fluted drill at bar;
B: bar is rotated to an angle, between the major first flank of second back knife face and opposite side of a side cutting edge, adopt the sharpening emery wheel to grind the 3rd back knife face; Part between the major first flank of the 3rd back knife face and opposite side cutting edge of a described side cutting edge forms secondary chisel edge and front cutting edge, makes the major first flank of described main cutting edge and the angle between the processing plane less than the major first flank of front cutting edge and the angle between the processing plane.
Embodiment two:
Be illustrated in figure 9 as another embodiment of the invention, with different among the embodiment one be, the thick core less than front cutting edge 12 parts of core of the main cutting edge 11 of the apex point part of the primary and secondary sword microbit of embodiment two is thick.The core that such design can be thickeied front cutting edge 12 parts is thick, makes that the core thickness rate of whole microbit is more solid, can improve the hole site precision.
Above content be in conjunction with concrete preferred embodiment to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a primary and secondary sword microbit comprises a main cutting edge and a front cutting edge; It is characterized in that, the main cutting edge of described primary and secondary sword microbit and front cutting edge respectively have at least one back knife face, and the major first flank of described main cutting edge and the angle between the processing plane are less than the major first flank of front cutting edge and the angle between the processing plane; Described main cutting edge also is provided with one second back knife face and one the 3rd back knife face, described front cutting edge also is provided with one second back knife face, and the 3rd back knife face of described main cutting edge is arranged between the major first flank of second back knife face and front cutting edge of main cutting edge; Form secondary chisel edge between the 3rd back knife face of described main cutting edge and the major first flank of front cutting edge; Form main chisel edge between the second back knife face of front cutting edge and the major first flank of main cutting edge, the angle between described main chisel edge and the processing plane is less than the angle between secondary chisel edge and the processing plane.
2. a kind of primary and secondary sword microbit as claimed in claim 1 is characterized in that, described main cutting edge and front cutting edge are positioned at along on the same surfaces of revolution of rotating shaft.
3. a kind of primary and secondary sword microbit as claimed in claim 1 or 2 is characterized in that, knife face after described main cutting edge has three, knife face after described front cutting edge has two.
4. a kind of primary and secondary sword microbit as claimed in claim 3, it is characterized in that, described primary and secondary sword microbit has a main chip area corresponding with main cutting edge and a secondary chip area corresponding with front cutting edge, and the length of described main chip area is longer than the length of secondary chip area.
5. a kind of primary and secondary sword microbit as claimed in claim 4 is characterized in that the afterbody of described secondary chip area crosses in main chip area.
6. a kind of primary and secondary sword microbit as claimed in claim 1 is characterized in that, the thick core less than the front cutting edge part of the core of the main cutting edge of the apex point part of described primary and secondary sword microbit is thick.
7. a kind of primary and secondary sword microbit as claimed in claim 1 is characterized in that, described main cutting edge has a plurality of backs knife face; Described front cutting edge also has a plurality of backs knife face, and the angle between described a plurality of back knife faces and the processing plane increases along direction of rotation successively from major first flank.
8. the processing method of a primary and secondary sword microbit may further comprise the steps:
A: the apex point part that processes conventional fluted drill at bar;
B: bar is rotated to an angle, between the major first flank of second back knife face and opposite side of a side cutting edge, adopt the sharpening emery wheel to grind the 3rd back knife face; Part between the major first flank of the 3rd back knife face and opposite side cutting edge of a described side cutting edge forms secondary chisel edge and front cutting edge, makes the major first flank of main cutting edge and the angle between the processing plane less than the major first flank of front cutting edge and the angle between the processing plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110226121 CN102294505B (en) | 2011-08-08 | 2011-08-08 | Mother-and-son edge microbit and processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110226121 CN102294505B (en) | 2011-08-08 | 2011-08-08 | Mother-and-son edge microbit and processing method thereof |
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| CN102294505A CN102294505A (en) | 2011-12-28 |
| CN102294505B true CN102294505B (en) | 2013-07-17 |
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| CN 201110226121 Active CN102294505B (en) | 2011-08-08 | 2011-08-08 | Mother-and-son edge microbit and processing method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101851528B1 (en) * | 2016-01-05 | 2018-04-24 | 한국야금 주식회사 | Flat drill |
| CN107138782A (en) * | 2017-06-08 | 2017-09-08 | 苏州科比特切削科技有限公司 | A kind of milling cutter of primary and secondary sword structure |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4759667A (en) * | 1985-11-08 | 1988-07-26 | American Telephone And Telegraph Company, At&T Technologies, Inc. | Twist drill for drilling printed circuit board laminates and having an drill point geometry |
| US5813804A (en) * | 1995-10-30 | 1998-09-29 | Mapal | Boring tool for composite laminate materials |
| JP4324211B2 (en) * | 2007-05-29 | 2009-09-02 | ユニオンツール株式会社 | Drilling tool |
| CN101780553B (en) * | 2009-01-15 | 2012-07-18 | 株式会社钨钛合金 | Drill and its grinding method |
| WO2011047865A1 (en) * | 2009-10-21 | 2011-04-28 | Gühring Ohg | Drilling tool |
| CN101767217B (en) * | 2009-12-25 | 2012-11-14 | 深圳市金洲精工科技股份有限公司 | Micro-bit and processing apparatus using the micro-bit |
| CN202207821U (en) * | 2011-08-08 | 2012-05-02 | 深圳市金洲精工科技股份有限公司 | Microbit having cluster blade |
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