CN102357665A - Microbit and processing method thereof - Google Patents
Microbit and processing method thereof Download PDFInfo
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- CN102357665A CN102357665A CN2011102966234A CN201110296623A CN102357665A CN 102357665 A CN102357665 A CN 102357665A CN 2011102966234 A CN2011102966234 A CN 2011102966234A CN 201110296623 A CN201110296623 A CN 201110296623A CN 102357665 A CN102357665 A CN 102357665A
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Abstract
The invention discloses a microbit and a processing method thereof. The microbit comprises a drill body and a drill tip, wherein the drill tip comprises a chisel edge and at least one cutting edge; the microbit also comprises a main chip discharge groove corresponding to the cutting edge and spirally extending from the drill tip to the drill body; the microbit is characterized in that sub-grooves are also arranged at the part of a rear tool face of the cutting edge, corresponding to the chisel edge; and the sub-grooves are intersected in the main chip discharge groove. According to the invention, as the sub-grooves intersected in the main chip discharge groove are also arranged at the part of a rear tool face of the cutting edge, corresponding to the chisel edge, the length of the chisel edge is reduced, better centering is realized, the tool sliding degree in drilling is lower, the axial stress is smaller, the tool is not easily broken, and the microbit performance is improved. In addition, as the sub-grooves arranged at the chisel edge are intersected in the main chip discharge groove, the length of the chisel edge keeps unchanged before and after re-grinding even through re-grinding is performed many times, and the performances such as relatively small axial force, relatively good centering degree of drilling and the like can still be kept.
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 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 increasingly high 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 little brill of PCB), is derived by traditional fluted drill.The little brill size of PCB 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 of decision drilling quality and efficient.
The client is increasingly high to properties of product, the quality requirements of PCB drill bit, and conventional products can not be met customer need.
Like Fig. 1-shown in Figure 3, PCB drill bit commonly used at present comprises and bores body and apex point that there are the cutting edge 1 of two symmetries and the back knife faces 11,12 of two groups of symmetries in its apex point place, bores the main chip area 2 corresponding to cutting edge 1 that then is provided with two symmetrical spirals on one's body.Along with the brill of microbit directly requires more and more forr a short time, its requirement to rigidity is also increasingly high, more be prone to the breaking of rod and bore the more little microbit in footpath, and conventional bit two helicla flute forms has weakened the drill bit rigidity, is prone to breaking.Be head it off, Fig. 4 is the thicker a kind of microbit of a kind of core thickness rate, and it only is provided with a cutting edge; Also be provided with a corresponding main chip area of main cutting edge therewith; The position of the opposite side that it is corresponding is provided with a secondary chip area, but does not establish cutting edge, so thick can do thicker of core.But the chisel edge of this microbit is longer, and it is poor to feel relieved, and following brill is prone to sliding cutter; Axially loaded is also bigger; Be prone to breaking, it is less therefore to press for a kind of axial force, better performances such as the centering degree of following brill; Especially axial force is less under the condition of bradawl footpath, the microbit of better performances such as the centering degree of following brill.
Summary of the invention
It is less that technical problem to be solved by this invention provides a kind of axial force, a kind of microbit and the processing method thereof of better performances such as the centering degree of following brill.
The objective of the invention is to realize: a kind of microbit through following technical scheme; Comprise and bore body and apex point; Said apex point comprises chisel edge and at least one cutting edge, said microbit also comprise corresponding with cutting edge from apex point always in the shape of a spiral shape extend to the main chip area that bores body; Said microbit also offers pilot trench at the back knife face of cutting edge corresponding to the position of chisel edge, and described pilot trench crosses in main chip area.
Preferably, described pilot trench is the helical form identical with main chip area and extends to boring the body direction from apex point in the apex point position.
Preferably, the flute length of described pilot trench is consistent with the length of the major part of apex point part, and its end crosses in chip area.This is the design of boring to major part, only at the enlarged head branch pilot trench is set, and has not only reduced the length of chisel edge, and it is still shorter to be enough to guarantee repeatedly to turn over its chisel edge of mill back; And the end after enlarged head is divided crosses in chip area, avoids reducing the core diameter that drill body part divides, and the rigidity intensity of microbit is better.
Preferably, described pilot trench in the shape of a spiral shape extend to the brill body of microbit always.Improve the chip removal ability of microbit.
Preferably, described pilot trench is two, is separately positioned on the two ends of chisel edge.Such design can further reduce the length of chisel edge, and its centering is better, and the sliding cutter degree of following brill is lower, and axially loaded is littler, is difficult for breaking.
Preferably, the position non-flat transition of described pilot trench and cutting edge forms the broken line sword in intersection.The position that pilot trench and cutting edge intersect is non-seamlessly transitting; Form angular broken line sword; Chip breaking can be assisted in the position that forms the broken line sword; Can smear metal in time be cut off so that smear metal can in time be discharged through chip area, avoid smear metal to form the generation that long long section causes twining silk, make the chip breaking better effects if of microbit.
Preferably; Only be provided with a cutting edge on the apex point of said microbit; Microbit also comprises a main chip area corresponding with cutting edge, and a secondary chip area, and said two pilot trench that are arranged on the chisel edge two ends cross respectively in main chip area and secondary chip area.Pilot trench crosses to main chip area and secondary chip area, and chip removal is more unimpeded.
Preferably, described microbit also is provided with back-off in the position corresponding to secondary chip area.Being provided with of back-off can reduce microbit in drilling process with the friction of hole wall.
Preferably, the apex point of described microbit part also is being provided with back-off corresponding to the position between main chip area and the secondary chip area, and after described back-off crossed in the secondary chip area, described secondary chip area crossed in main chip area again.Being provided with of back-off can reduce microbit in drilling process with the friction of hole wall, and such apex point part that is arranged so that described microbit has contact at 3 with hole wall in drilling process, can form triangle (3 points) support.Common microbit all belongs to 2 supports, and the microbit in the present embodiment belongs to triangular support, and triangular support is more stable, has not only reduced the friction of hole wall, and the boring ailhead of its formation is little, and can improve the hole site precision.And after crossing back-off in the secondary chip area, described secondary chip area crosses in main chip area again, and dust discharge is more unimpeded, and core is thick better.
Preferably, described back-off partly is arranged on the cutting edge direction of main chip area at apex point, and the thickness between said main chip area and the back-off is greater than the thickness between main chip area and the secondary chip area.The back-off that groove depth is more shallow is arranged on the cutting edge direction of main chip area; And the darker secondary chip area of groove depth is arranged on opposite side; Make thickness (being the thickness of main cutting edge one side) between said main chip area and the back-off greater than the thickness between main chip area and the secondary chip area, can better support force, good rigidly be provided for main cutting edge; Drill bit torque resistant ability is strong, is difficult for breaking.
Microbit described in the present invention can be realized through following processing method: a kind of processing method of above-mentioned microbit may further comprise the steps:
A: carry out normal process according to the normal miniature drill bit;
B: at the back knife face of the cutting edge pilot trench in the main chip area that crosses corresponding to the position processing of chisel edge.
The present invention has reduced the length of chisel edge owing to also offer the pilot trench that crosses in the main chip area corresponding to the position of chisel edge at the back knife face of cutting edge, and its centering is better; The sliding cutter degree of following brill is lower; Axially loaded is littler, is difficult for breaking, has improved the performance of microbit.And, be the pilot trench of crossing because the chisel edge place offers to main chip area, even therefore repeatedly return mill, chisel edge length can keep returning the uniformity before and after the mill, still can keep axial force less, better performance such as the centering degree of following brill.
Description of drawings
Fig. 1 is the apex point structural representation of conventional bit in the prior art;
Fig. 2 is the profile that the drill body part of conventional bit in the prior art divides;
Fig. 3 is the overall structure sketch map of conventional bit in the prior art;
Fig. 4 is the apex point structural representation of the thicker microbit of a kind of core thickness rate;
Fig. 5 is the apex point structural representation of an embodiment of the present invention;
Fig. 6 is the profile that the drill body part of an embodiment of the present invention divides;
Fig. 7 is the overall structure sketch map of an embodiment of the present invention;
Fig. 8 is the pilot trench of an embodiment of the present invention and the structural representation of chip area intersection;
Fig. 9 is the apex point structural representation of the another kind of embodiment of the present invention;
Figure 10 is the structural representation that each groove of the microbit shown in Fig. 9 crosses;
Figure 11 is the apex point structural representation of another embodiment of the present invention;
Figure 12 is the apex point structural representation of another embodiment of the present invention;
Figure 13 is the apex point structural representation of another embodiment of the present invention.
Wherein: 1, main cutting edge; 2, main chip area; 3, chisel edge; 4, secondary chip area; 6, back-off; 7, broken line sword; 11, major first flank; 12, the second back knife face; 13, the 3rd back knife face; 14, the 4th back knife face; 21, pilot trench; 30, cutting plane; 41, secondary pilot trench.
The specific embodiment
The present invention discloses a kind of microbit, comprises boring body and apex point, and wherein, said apex point comprises chisel edge and at least one cutting edge, said microbit also comprise corresponding with cutting edge from apex point always in the shape of a spiral shape extend to the main chip area of brill body; Said microbit also offers pilot trench at the back knife face of cutting edge corresponding to the position of chisel edge, and described pilot trench crosses in main chip area.The chisel edge length on the apex point that is arranged so that of pilot trench shortens, and then makes that the centering of drill bit is better, and the sliding cutter degree of following brill is lower, and axial force is littler, is difficult for breaking, has improved the performance of microbit; And, because described pilot trench crosses in main chip area, and by the hand of spiral spiral of main chip area; Make the sword core of drill bit all be consistent from interior at a very long end distance; Therefore even after having carried out repeatedly returning mill, the length of chisel edge will remain with return mill before consistent, and then guaranteed that the axial force of drill bit can not produce bigger variation; Promptly still keep less axial force, also kept its centering stability etc.
In order to reduce chisel edge, the applicant also once want to set up a step surface at the apex point of microbit corresponding to the position of chisel edge, was used for chisel edge is beaten weak point, and its axial force is reduced; Also can be so that the centering of brill is well down, the position, hole is also better, is difficult for the breaking of rod, but for the PCB microbit; Can repeatedly utilize as the one of which, after the wearing and tearing of apex point blade, also need repeatedly return mill; To utilize once more, above-mentioned microbit will increase through once returning its chisel edge of mill back, even the back knife face that causes the chisel edge place to set up disappears; Performance reduces, and shorten service life, still is not enough to use.Therefore, the application talent has designed the above-mentioned microbit that has pilot trench.
Below in conjunction with accompanying drawing and preferred embodiment the present invention is described further.
Embodiment one:
Shown in Fig. 5-8; The apex point of this microbit only comprises a main cutting edge 1, and major first flank 11, the second back knife face 12, the 3rd back knife face 13 and the 4th back knife face cross each other and form chisel edge 3, and main cutting edge 1 position correspondence is provided with a main chip area 2; This main chip area 2 crosses with main cutting edge 1 and the 3rd back knife face 13; And carry out spiral along boring body by certain helical angle, corresponding, one with at the second secondary knife face 12; The 3rd back knife face 13 and the 4th back secondary chip area 4 that cross of knife face 14 be also by carrying out spiral with the same helical angles of main chip area 2 on one's body boring, or behind apex point, promptly import main chip area.Intersection's (being chisel edge 3 one end places) at the major first flank of main cutting edge 1 and the 3rd back knife face is provided with pilot trench 21, and this pilot trench 21 is in the apex point position is set directly at main chip area 2 and by the hand of spiral spiral of main chip area 2; At the other end of chisel edge 3, be positioned at the second back knife face 12 and the 4th back knife face 14 place intersections, be provided with secondary pilot trench 41, this pair pilot trench 41 directly is set in the secondary chip area 4 and crosses in secondary chip area 4.Because pilot trench 21 and secondary pilot trench 41 originate in chisel edge 3 places; So the two ends of chisel edge 3 end distance of being pruned leaves, and then makes chisel edge shorten; It is easier that yet short chisel edge makes when drill bit goes into to bore; Reduce the suffered axial force of apex point and be difficult for the breaking of rod, and the centering performance of apex point also is improved, position, hole precision is better.
In addition; Owing to increased pilot trench 21 and secondary pilot trench 41; Make the chip removal ability of drill bit be improved; Pilot trench 21 forms broken line sword 7 with the intersection of major first flank 11 and the 3rd back knife face 14, and this broken line sword 7 can in time cut off smear metal so that smear metal can in time be discharged through chip area, avoids smear metal to form the generation that long long section causes twining silk.
The sword core of microbit is the axe shape, is illustrated in figure 6 as the sectional view of microbit, and the brill core of drill bit is thicker, and its lateral support position one wide one is narrow; Whole supporting construction triangular in shape has three strong points, and its Stability Analysis of Structures is solid, and; Because its rigidity is higher, the torque resistant ability is strong, is difficult for breaking, and drill bit also is difficult for shake when going into to bore; Thereby can obtain position, hole preferably, see from its cross section, the brill core of drill bit is as an axe.Compare with common microbit, the microbit among the present invention belongs to triangular support, and its lateral support one wide one is narrow, and triangular support is more stable, has not only reduced the friction of hole wall, and the boring ailhead of its formation is little, and can improve the hole site precision.
In the present embodiment, can see that the area of major first flank 11 is bigger from accompanying drawing 5; And shown in figure 10, major first flank 11 is greater than the second back knife face 12 with respect to the angle of cutting plane 30, in addition; Major first flank 11 with respect to the angle of cutting plane 30 also greater than the 3rd back knife face 13 and the 4th back knife face 14 (not showing among the figure); Therefore this drill bit mainly relies on main cutting edge 1 to cut, and the area of the major first flank 11 of main cutting edge 1 is comparatively roomy, thereby; Its wearability is better comparatively speaking, so service life is also just longer.
As shown in Figure 7; Being positioned at the edge of boring body at the second back knife face 12 is that the behind of main cutting edge 1 is provided with back-off 6; Back-off 6 is the same and length that length back-off is less than main chip area 2 is a lot of in the helical angle of apex point place and main chip area 2; Back-off 6 can carry out the transition to brill gradually and go on one's body in the process of spiral, back-off 6 the friction that mainly is to reduce drill bit and hole wall is set, thereby reduce the suffered distorting stress of drill bit.In addition; Back-off 6 is arranged on that the second back knife face 12 is positioned at the edge of boring body rather than in the corresponding position of secondary chip area 4; Can be so that the thickness between main chip area and the back-off greater than the thickness between main chip area and the secondary chip area, and then can provide better holding power, good rigidly for main cutting edge 1; Make that the drill bit anti-twisting property is strong, be difficult for breaking.
In addition, pilot trench 21 is with another effect of secondary pilot trench 41, when drill bit need return mill; Because a very long segment distance near apex point; Pilot trench 21 all is constant with the degree of depth of secondary pilot trench 41, thereby in this segment distance, the brill core shape of drill bit and thickness also are constant; So return the drill bit of mill, the length of its chisel edge 3 can not change.
For pilot trench 21 and secondary pilot trench 41, need the helix length the same with main chip area 2 and secondary chip area 4 yet, after carrying out certain spiral, pilot trench 21 can cross with secondary pilot trench 41 and be fused in main chip area 2 and the secondary chip area 4, and is as shown in Figure 8.That is to say, after one section bore the existence that will not have pilot trench 21 and secondary pilot trench 41 in the body, and this section bores the brill core thickness of body and will be increased, and like this, just improved and bored the intensity of body, thereby can effectively reduce the generation of the breaking of rod.
The processing method of above-mentioned microbit is following:
A: carry out normal process according to the normal miniature drill bit;
B: at the back knife face of the cutting edge pilot trench in the main chip area that crosses corresponding to the position processing of chisel edge.
Embodiment two:
Be illustrated in figure 9 as another kind of embodiment of the present invention, different with embodiment one is that the microbit of present embodiment is not provided with back-off; Described secondary pilot trench 41 can further cross in secondary chip area, and described secondary chip area crosses in main chip area again, converges into a groove chip removal; Shown in figure 10; Like this, can increase further that to bore the core be in thick, strengthen the rigidity of microbit.
If being major part, bores microbit; (said major part partly is the external big part of the front end external diameter of apex point part than the posterior part that bores body to have the major part part; About 0.5mm is to 1mm); It has only the bigger part of external diameter to contact the then more unnecessary back-off that is provided with workpiece to be processed and alleviates the friction of boring body and hole wall when drilling.And for pilot trench 21 and secondary pilot trench 41; Preferably also the length with the major part part is consistent; In this segment distance, crossing is fused in main chip area 2 and the secondary chip area 4, and like this, the brill core thickness of major part part is unlikely to excessive with the brill core thickness difference of boring body posterior segment part; Good maintenance bore the structural strength of core, make the bulk strength of drill bit be improved.
Embodiment three:
Shown in figure 11 is the third embodiment of the present invention, and in the present embodiment, different with embodiment one is; Back-off 6 is arranged on the position corresponding to secondary chip area 4 in the apex point position; Like this, can better avoid boring body and hole wall friction, thereby reduce the distorting stress of drill bit.After described back-off crossed in the secondary chip area, described secondary chip area crossed in main chip area again, converges into a groove chip removal.Like this, can increase further that to bore the core be in thick, strengthen the rigidity of microbit.Secondary chip area or main chip area are to become spiral, increase the ditch amplitude ratio, have improved the chip area space.
Embodiment four:
Shown in figure 12 is the 4th kind of embodiment of the present invention, and in the present embodiment, different with embodiment one is; Only on main chip area 2, be provided with pilot trench 21, and secondary chip area 4 is not provided with secondary pilot trench, like this; Both shortened the length of chisel edge 3, and guaranteed to make that the thickness that bores core is thick than the brill core of embodiment one said drill bit under axial force is little, centering is good and the position, hole the is good situation; And then improve the structural strength of boring core, and make drill bit when cutting, be not easy shake, it is more accurate to feel relieved; The position, hole also will be better, and simultaneously, the possibility of the breaking of rod also further reduces.
Embodiment five:
Shown in figure 13 is the 5th kind of embodiment of the present invention, and present embodiment is with reference to embodiment three and embodiment four, and different with embodiment three is, drill bit only comprises a pilot trench in the present embodiment, and different with embodiment four is that present embodiment four also is provided with back-off 6.With respect to embodiment three, the brill core of the drill bit of present embodiment is thick, thereby drill bit intensity will be higher than embodiment three described drill bits; And with respect to embodiment four, the drill bit of present embodiment is owing to be provided with back-off 6, when making its drilling and the friction of hole wall reduce as much as possible.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (11)
1. microbit comprises and bores body and apex point that said apex point comprises chisel edge and at least one cutting edge, said microbit also comprise corresponding with cutting edge from apex point always in the shape of a spiral shape extend to the main chip area of brill body; It is characterized in that said microbit also offers pilot trench at the back knife face of cutting edge corresponding to the position of chisel edge, described pilot trench crosses in main chip area.
2. a kind of microbit as claimed in claim 1 is characterized in that, described pilot trench is the helical form identical with main chip area and extends to boring the body direction from apex point in the apex point position.
3. a kind of microbit as claimed in claim 2 is characterized in that, the flute length of described pilot trench is consistent with the length of the major part of apex point part, and its end crosses in chip area.
4. a kind of microbit as claimed in claim 2 is characterized in that, described pilot trench shape in the shape of a spiral extends to the brill body of microbit always.
5. a kind of microbit as claimed in claim 1 is characterized in that described pilot trench is two, is separately positioned on the two ends of chisel edge.
6. a kind of microbit as claimed in claim 1 is characterized in that, the position non-flat transition of described pilot trench and cutting edge forms the broken line sword in intersection.
7. like claim 1 or 5 arbitrary described a kind of microbits; It is characterized in that; Only be provided with a cutting edge on the apex point of said microbit; Microbit also comprises a main chip area corresponding with cutting edge, and a secondary chip area, and said two pilot trench that are arranged on the chisel edge two ends cross respectively in main chip area and secondary chip area.
8. a kind of microbit as claimed in claim 7 is characterized in that, described microbit also is provided with back-off in the position corresponding to secondary chip area.
9. a kind of microbit as claimed in claim 8; It is characterized in that; The apex point of described microbit part also is being provided with back-off corresponding to the position between main chip area and the secondary chip area, and after described back-off crossed in the secondary chip area, described secondary chip area crossed in main chip area again.
10. a kind of microbit as claimed in claim 9 is characterized in that, described back-off partly is arranged on the cutting edge direction of main chip area at apex point, and the thickness between said main chip area and the back-off is greater than the thickness between main chip area and the secondary chip area.
11. the processing method like the arbitrary described microbit of claim 1-10 is characterized in that, may further comprise the steps:
A: carry out normal process according to the normal miniature drill bit;
B: at the back knife face of the cutting edge pilot trench in the main chip area that crosses corresponding to the position processing of chisel edge.
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| CN2011102966234A CN102357665A (en) | 2011-10-08 | 2011-10-08 | Microbit and processing method thereof |
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| CN2011102966234A CN102357665A (en) | 2011-10-08 | 2011-10-08 | Microbit and processing method thereof |
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| CN102837033A (en) * | 2011-06-20 | 2012-12-26 | 华伟纳精密工具（昆山）有限公司 | UC-shaped micro drill with asymmetric groove length and indexing angle |
| CN108080679A (en) * | 2017-12-26 | 2018-05-29 | 深圳市金洲精工科技股份有限公司 | A kind of drill bit |
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| CN110605425A (en) * | 2018-06-15 | 2019-12-24 | 上海惠而顺精密工具股份有限公司 | Hard alloy printed circuit board candle drill |
| CN113523366A (en) * | 2021-06-22 | 2021-10-22 | 北京理工大学 | Small deep hole drilling tool without cross-edge radial broken line edge |
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| CN102837033A (en) * | 2011-06-20 | 2012-12-26 | 华伟纳精密工具（昆山）有限公司 | UC-shaped micro drill with asymmetric groove length and indexing angle |
| CN108080679A (en) * | 2017-12-26 | 2018-05-29 | 深圳市金洲精工科技股份有限公司 | A kind of drill bit |
| CN110605425A (en) * | 2018-06-15 | 2019-12-24 | 上海惠而顺精密工具股份有限公司 | Hard alloy printed circuit board candle drill |
| 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 |
| CN113523366A (en) * | 2021-06-22 | 2021-10-22 | 北京理工大学 | Small deep hole drilling tool without cross-edge radial broken line edge |
| CN114393454A (en) * | 2022-01-25 | 2022-04-26 | 厦门厦芝科技工具有限公司 | Groove micro-diameter drill bit processing method and groove micro-diameter drill bit |
| WO2024083136A1 (en) * | 2022-10-17 | 2024-04-25 | 嘉兴沃尔德金刚石工具有限公司 | Micro drill bit |
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Application publication date: 20120222 |