CN103357925A - Micro single-blade drill for machining printed circuit board (PCB) - Google Patents

Micro single-blade drill for machining printed circuit board (PCB) Download PDF

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Publication number
CN103357925A
CN103357925A CN2012100887976A CN201210088797A CN103357925A CN 103357925 A CN103357925 A CN 103357925A CN 2012100887976 A CN2012100887976 A CN 2012100887976A CN 201210088797 A CN201210088797 A CN 201210088797A CN 103357925 A CN103357925 A CN 103357925A
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CN
China
Prior art keywords
chip area
short
long
towel
drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012100887976A
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Chinese (zh)
Inventor
王俊锋
王雪峰
陈明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XINYE DINGTAI ELECTRONIC FINE TECHNOLOGY CO LTD
Original Assignee
XINYE DINGTAI ELECTRONIC FINE TECHNOLOGY CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XINYE DINGTAI ELECTRONIC FINE TECHNOLOGY CO LTD filed Critical XINYE DINGTAI ELECTRONIC FINE TECHNOLOGY CO LTD
Priority to CN2012100887976A priority Critical patent/CN103357925A/en
Publication of CN103357925A publication Critical patent/CN103357925A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a micro single-blade drill for machining a printing substrate of a PCB. The micro single-blade drill comprises a drill body, three spiral chip grooves are formed in the drill body, the long chip groove extends to the tail end of the drill body from the position of the drill tip in a spiral mode, the short chip groove is formed in the front section of the drill body, the short chip groove and the long chip groove are unparallel due to different spiral angles and intersected finally, the back chip groove is arranged on the back after the long chip groove and the short chip groove intersect, finally, the short chip groove and the back chip groove which are in a separated state intersect with the long chip groove, and a single main cutting blade is arranged at the drill tip. The chip grooves of different widths and spiral angles can assist the drill to perform the cutting operation stably and discharge waste chip rapidly, the drilling quality can be improved, the hole wall roughness can be guaranteed. The micro single-blade drill has the advantages that the rigidity is good, the hole site accuracy is high, the hole wall roughness can meet requirements, and the drill is not prone to needle breakage.

Description

The miniature single cutting bit of processing printed circuit board
Technical field
The invention belongs to PCB microbit technical field, relate to a kind of miniature single cutting bit of the processing printed circuit board for PCB printed board processing.
Background technology
In known technology, the finished product of PCB microbit mainly is divided into two kinds at present, a kind of be conventional bit as shown in Figure 1-Figure 3, conventional bit forms by boring body Fig. 1 and apex point Fig. 2 respectively, it bores body as shown in Figure 1, being processed into twisted shape (helical form) by the cylinder Hardmetal materials forms, article two, the helical flute of symmetry forms, apex point 3a as shown in Figure 2, main cutting edge 1b by two symmetries, chisel edge between two main cutting edges and two helical front cutting edges that are positioned at the rear side of main cutting edge form, formed respectively the first operator face 2b and the second secondary knife face 3b as shown in the figure between described main cutting edge and front cutting edge and the chisel edge, be formed with center line 4b between the first operator face 2b and the second secondary knife face 3b, the length of center line is roughly consistent with the length of boring the body diameter, spiral front cutting edge extends to boring the Shenzhu face, form the spiralling chip area 1a of two symmetries, 2a, chip area 1a as shown in Figure 3, the degree of depth of 2a is increasing evenly distribution on the brill Shenzhu face, when carrying out grinding, front cutting edge contacts with the hole wall that grinding goes out, and forms the strong point.
Present development along with market, bit diameter has the trend that day by day reduces, diameter diminishes, the processing printed board under equal conditions is difficult to guarantee the rigidity of drill bit, rigidity can not guarantee, printed board will occur processing bores to departing from, can not the satisfying the market requirement, diameter mainly is the following drill bit of bradawl ¢ 0.50mm, there is at present company of the same trade to research and develop again and improves above problem, release the second single cutting bit, brill body Fig. 4 mainly is the helical flute structure by two former symmetries, become a long helical flute 2c and a short chip area 1c composition, the withdrawing section of apex point Fig. 5 consists of by being linked to be a plurality of withdrawing faces, two withdrawing faces intersect the first crest line 5c that forms and are positioned at drill bit foremost, the axle center O of the relative drill bit of this first crest line 5c is in the rotating center section of drill bit with meeting at right angles, the end of this first crest line 5c intersects the second crest line 7c that forms with two withdrawing faces and links to each other, and the outer end of this second crest line 7c links to each other with main cutting edge 1c section, the other end of the first crest line 5c is towards the opposition side that is connected side with the second crest line 7c, the apex point of this structure is not to be made of point, but formed by the first crest line with certain-length, therefore the intensity of blade tip increases, but establishment is damaged or damaged when being attached to the chisel edge section that easily produces when being cut on the material, can keep high machining hole position precision, and can prevent owing to the unstable broken drill that produces of the attaching that is cut material, and the processing printed board is bored to not departing from, so just can improve the indeterminable problem of conventional bit, and the basis at the equal processing conditions of conventional bit promotes working (machining) efficiency, but being hard up for money of this single cutting bit mainly is that the contact area of towel back of the body 6c and hole wall is too large, because penetration rate is too fast, shown in Figure 6, article one, long helical flute 8c and a short chip area 9c waste discharge bits space are too little, so that the speed of waste discharge bits is too slow, higher at ask for something, find in the use of the printed board that difficulty is higher that Hole Wall Roughness is very large, still can not satisfy user demand.3c is that the limit cutter is wide among the figure, and 4c is time chip discharging grooves, and O is the drill bit axle center.
Summary of the invention
The defective that exists in order to solve prior art, the invention provides a kind of rigidity better, precision higher, empty wall roughness in position, hole can satisfy the demands, and be difficult for the miniature single cutting bit of the processing printed circuit board of broken needle.
The object of the present invention is achieved like this: comprise and handle bodily form all-in-one-piece bit drills body, it is characterized in that: have three spiralling chip areas with it in bit drills, wherein article one is long chip area, long chip area extends spirally the end that bores body from the position of apex point, second is short chip area, short chip area is arranged on and bores on the body leading portion, short chip area is not parallel with long chip area owing to spiral angle is different but final intersecting arranges, article three, be towel back of the body chip area, towel back after towel back of the body chip area is arranged on long chip area and short chip area and intersects, also boring on the body leading portion, final short chip area and towel back of the body chip area are crossed with long chip area by released state, and apex point is set to single main cutting edge; And the chip area different in width, different spiral angles, reaching auxiliary drill bit stablely carries out cutting operation, discharges the purpose of scrap fast, promotes the boring quality, guarantees empty wall roughness.
Described short chip area setting is positioned at bit drills body leading portion, is a short chip area of spending with long chip area symmetrical 180, and the angle of helical angle is identical with long chip area, and short chip area is crossed with long chip area by released state; The length of short chip area accounts for the 15%-25% of the length of long chip area, short chip area is dissolved into and is guaranteed drilling hole position precision in the long chip area, and the helical angle augmenting portion shoals groove depth gradually, so that the groove width of the long chip area of intersection and short chip area is wider, be beneficial to chip removal, shoal to remedy the rigidity loss that groove width is brought with the degree of depth, can apply in a flexible way.
The described towel back that is arranged on after long chip area and the second short chip area intersect, also at the leading portion that bores body, be arranged on the towel back after long chip area and the second short chip area intersect, also at the leading portion that bores body, towel back of the body chip area and short chip area are crossed with long chip area by released state, and two towel hem width degree equates, the length of towel back of the body chip area accounts for the 35%-55% of long chip removal flute length, guaranteeing has increased the chip removal space on the basis of the good rigidly of short chip area, practical sheet material of slightly being had relatively high expectations in the hole in boring, and because the time of boring is shorter, solid capacity itself is just smaller, thus towel back of the body chip area can remedy before good rigidly but empty wall roughness does not reach the defective of requirement.
Described apex point comprises a main cutting edge, an operator face, a secondary knife face, two towel limits, a limit cutter, operator face intersects formation the first crest line with secondary knife face, the axle center O of the relative drill bit of the first crest line is in the rotating center section of drill bit with meeting at right angles, and an end of the first crest line and two withdrawing faces intersect the second crest line that forms; Take axle center O as initial point, article two, towel limit and a limit cutter form a triangle point, in when boring location of holing exactly, and cooperate main cutting edge to cut, so that position, the hole precision that gets out is higher, rapidly scrap is discharged by long chip area, the second short chip area, the 3rd towel back of the body chip area, two towel limits are sharp to the borehole wall cutting, can guarantee good Hole Wall Roughness.
The finished product of the miniature single cutting bit of PCB of making according to above-mentioned technique and processing method, can realize because diameter diminishes, the drill bit rigidity can not guarantee, the processing printed board under equal conditions occurring bores to the phenomenon that departs from, and the life-span can promote on the former basis, all has relatively high expectations, the Hole Wall Roughness of the printed board that difficulty is higher can reach, and the processing conditions and the environment that do not need client end alteration, client does not need to buy other new equipment yet and uses this single cutting bit, in technique, equipment, thereby can not increase the cost that cost reduces processing in the staff training yet, enhance productivity.With the contrast of prior art single cutting bit, there has been approximately 3 times raising in the life-span of single cutting bit of the present invention.Along with the increase of hole limit, to compare with the prior art single cutting bit, single cutting bit has had significantly improvement than the retentivity of hole position.
Description of drawings
Fig. 1 is the brill body structure schematic plan view of conventional bit.
Fig. 2 is conventional bit apex point structural representation plane.
Fig. 3 is that conventional bit bores the body cross sectional representation.
Fig. 4 is that the single cutting bit in the known technology bores the body structure schematic diagram.
Fig. 5 is the single cutting bit apex point structural representation in the known technology.
Fig. 6 is that the single cutting bit in the known technology bores the body cross sectional representation.
Fig. 7 is that single cutting bit of the present invention bores the body structure schematic diagram.
Fig. 8 is single cutting bit the second short chip area of the present invention and the 3rd towel back of the body chip area schematic diagram that crosses.
Fig. 9 is single cutting bit apex point cross sectional representation of the present invention.
Figure 10 is along the profile in A-A cross section among Fig. 8.
Figure 11 is along the profile in B-B cross section among Fig. 8.
Figure 12 is along the profile in C-C cross section among Fig. 8.
Figure 13 is single cutting bit of the present invention and prior art single cutting bit contrast lifetime change figure.
Figure 14 is that single cutting bit of the present invention and prior art single cutting bit hole position CPK are with position, hole changing trend diagram.
Figure 15 is single cutting bit of the present invention and prior art single cutting bit Hole Wall Roughness contrast test datagram.
Single cutting bit accompanying drawing mark explanation of the present invention: 1: towel back of the body chip area; 2: long chip area; 3: bore the body leading portion; 4: short chip area; A: helical angle; 5: operator face; 6: secondary knife face; 7: the second crest lines; 8: main cutting edge; 9: the limit cutter; 10: the first crest lines; 11: the towel limit; O: drill bit axle center.
The specific embodiment
Referring to Fig. 1-Fig. 3, this conventional bit forms by boring body Fig. 1 and apex point Fig. 2 respectively, it bores body as shown in Figure 1, being processed into twisted shape (helical form) by the cylinder Hardmetal materials forms, article two, the helical flute of symmetry forms, apex point 3a as shown in Figure 2, by the main cutting edge 1b of two symmetries, the chisel edge between two main cutting edges and two helical front cutting edges that are positioned at the rear side of main cutting edge form.Formed respectively the first operator face 2b and the second secondary knife face 3b as shown in the figure between described main cutting edge and front cutting edge and the chisel edge, be formed with center line 4b between the first operator face 2b and the second secondary knife face 3b, the length of center line is roughly consistent with the length of boring the body diameter, spiral front cutting edge extends to boring the Shenzhu face, form spiralling chip area 1a, the 2a of two symmetries, the degree of depth of chip area 1a, 2a is increasing evenly distribution on the brill Shenzhu face as shown in Figure 3, when carrying out grinding, front cutting edge contacts with the hole wall that grinding goes out, and forms the strong point.
Referring to Fig. 4-Fig. 6, the prior art single cutting bit, brill body Fig. 4 mainly is the helical flute structure by two former symmetries, become a long helical flute 2c and a short chip area 1c composition, the withdrawing section of apex point Fig. 5 consists of by being linked to be a plurality of withdrawing faces, two withdrawing faces intersect the first crest line 5c that forms and are positioned at drill bit foremost, the axle center O of the relative drill bit of this first crest line 5c is in the rotating center section of drill bit with meeting at right angles, the end of this first crest line 5c intersects the second crest line 7c that forms with two withdrawing faces and links to each other, and the outer end of this second crest line 7c links to each other with main cutting edge 1c section, the other end of the first crest line 5c is towards the opposition side that is connected side with the second crest line 7c, the apex point of this structure is not to be made of point, but formed by the first crest line with certain-length, therefore the intensity of blade tip increases, but establishment is damaged or damaged when being attached to the chisel edge section that easily produces when being cut on the material, can keep high machining hole position precision, and can prevent owing to the unstable broken drill that produces of the attaching that is cut material, and the processing printed board is bored to not departing from, so just can improve the indeterminable problem of conventional bit, and the basis at the equal processing conditions of conventional bit promotes working (machining) efficiency, but being hard up for money of this single cutting bit mainly is that the contact area of towel back of the body 6c and hole wall is too large, because penetration rate is too fast, shown in Figure 6, article one, long helical flute 8c and a short chip area 9c waste discharge bits space are too little, so that the speed of waste discharge bits is too slow, higher at ask for something, find in the use of the printed board that difficulty is higher that Hole Wall Roughness is very large, still can not satisfy user demand.3c is that the limit cutter is wide among the figure, and 4c is time chip discharging grooves, and O is the drill bit axle center.
Referring to Fig. 7-Figure 12, a kind of miniature single cutting bit of processing printed circuit board, comprise and handle bodily form all-in-one-piece bit drills body, it is characterized in that: have three spiralling chip areas with it in bit drills, wherein article one is long chip area 2, long chip area 2 extends spirally the end that bores body from the position of apex point, second is short chip area 4, short chip area 4 is arranged on and bores on the body leading portion 3, short chip area 4 is not parallel with long chip area 2 owing to spiral angle is different but final intersecting arranges, article three, be towel back of the body chip area 1, towel back after towel back of the body chip area 1 is arranged on long chip area 2 and short chip area 4 and intersects, also boring on the body leading portion 3, both are crossed final short chip area 4 and towel back of the body chip area 1 with long chip area 2 by released state, and apex point is set to single main cutting edge 8.
Described short chip area 4 arranges and is positioned at bit drills body leading portion, is a short chip area of spending with long chip area 2 symmetrical 180, and the angle of helical angle a is identical with long chip area, and short chip area is crossed with long chip area by released state; The length of short chip area 4 accounts for the 15%-25% of the length of long chip area 2, short chip area 4 is dissolved into and is guaranteed drilling hole position precision in the long chip area 2, and helical angle a augmenting portion shoals groove depth gradually, so that the groove width of the long chip area of intersection and short chip area 4 is wider, be beneficial to chip removal, shoal to remedy the rigidity loss that groove width is brought with the degree of depth.
Described towel back of the body chip area 1 and short chip area 4 both follow two towel hem width degree after long chip area crosses to equate by released state, the length of towel back of the body chip area 1 accounts for the 35%-55% of long chip removal flute length, and guaranteeing has increased the chip removal space on the basis of the good rigidly of short chip area 4.
Described apex point comprises a main cutting edge 8, an operator face 5, a secondary knife face 6, two towel limits 11, a limit cutter 9, operator face 5 intersects formation the first crest line 10 with secondary knife face 6, the axle center O of the first crest line 10 relative drill bits is in the rotating center section of drill bit with meeting at right angles, and an end of the first crest line 10 and two withdrawing faces intersect the second crest line 7 that forms; Take axle center O as initial point, article two, towel limit 11 and a limit cutter 9 form a triangle point, in when boring location of holing exactly, and cooperate main cutting edge to cut, so that position, the hole precision that gets out is higher, rapidly scrap is discharged by long chip area, the second short chip area, the 3rd towel back of the body chip area, two towel limits are sharp to the borehole wall cutting, can guarantee good Hole Wall Roughness.
The structure of this invention single cutting bit is seen the chip area structure-improved among Fig. 7-Figure 12, bore body and be provided with three spiralling chip areas, wherein long chip area extends spirally the end that bores body from the position of apex point, the second short chip area is arranged on the leading portion that bores body, short chip area is not parallel but final setting of intersecting with long chip area owing to spiral angle is different, towel back after the 3rd towel back of the body chip area is arranged on long chip area and the second short chip area and intersects, also at the leading portion that bores body, the short groove of final the second chip removal and towel back of the body chip area are crossed with long chip area by released state, apex point is set to single main cutting edge, and the chip area different in width, different spiral angles, reach the stable cutting operation that carries out of auxiliary drill bit, discharge fast the purpose of scrap, promote the boring quality, guarantee empty wall roughness.
Referring to Figure 13,14,15, the single cutting bit that can find out this invention all satisfies customer requirement at diameter less than position, hole precision, life-span, the Hole Wall Roughness of the microbit of 0.50mm, and significant lifting is arranged.

Claims (4)

1. the miniature single cutting bit of a processing printed circuit board, comprise and handle bodily form all-in-one-piece bit drills body, it is characterized in that: have three spiralling chip areas with it in bit drills, wherein article one is long chip area (2), long chip area (2) extends spirally the end that bores body from the position of apex point, second is short chip area (4), short chip area (4) is arranged on and bores on the body leading portion (3), short chip area (4) is not parallel with long chip area (2) owing to spiral angle is different but final intersecting arranges, article three, be towel back of the body chip area (1), towel back of the body chip area (1) is arranged on long chip area (2) and short chip area (4) the towel back after crossing, also boring on the body leading portion (3), both are crossed final short chip area (4) and towel back of the body chip area (1) with long chip area (2) by released state, and apex point is set to single main cutting edge (8).
2. the miniature single cutting bit of processing printed circuit board according to claim 1, it is characterized in that: described short chip area (4) setting is positioned at bit drills body leading portion, it is a short chip area of spending with long chip area (2) symmetrical 180, the angle of helical angle (a) is identical with long chip area, and short chip area is crossed with long chip area by released state; The length of short chip area (4) accounts for the 15%-25% of the length of long chip area (2), short chip area (4) is dissolved into and is guaranteed drilling hole position precision in the long chip area (2), and helical angle (a) augmenting portion shoals groove depth gradually, so that the groove width of the long chip area of intersection and short chip area (4) is wider, be beneficial to chip removal, shoal to remedy the rigidity loss that groove width is brought with the degree of depth.
3. the miniature single cutting bit of processing printed circuit board according to claim 1, it is characterized in that: described towel back of the body chip area (1) and short chip area (4) both follow two towel hem width degree after long chip area crosses to equate by released state, the length of towel back of the body chip area (1) accounts for the 35%-55% of long chip removal flute length, and guaranteeing has increased the chip removal space on the basis of the good rigidly of short chip area (4).
4. the miniature single cutting bit of processing printed circuit board according to claim 1, it is characterized in that: described apex point comprises a main cutting edge (8), an operator face (14), a secondary knife face (12), two towel limits (11), a limit cutter (9), operator face (14) intersects formation the first crest line (10) with secondary knife face (12), the axle center O of the relative drill bit of the first crest line (10) is in the rotating center section of drill bit with meeting at right angles, and an end of the first crest line (10) and two withdrawing faces intersect the second crest lines (13) that form; (O) is initial point take the axle center, article two, towel limit (11) and a limit cutter (9) form a triangle point, in when boring location of holing exactly, and cooperate main cutting edge to cut, so that position, the hole precision that gets out is higher, rapidly scrap is discharged by long chip area, the second short chip area, the 3rd towel back of the body chip area, two towel limits are sharp to the borehole wall cutting, can guarantee good Hole Wall Roughness.
CN2012100887976A 2012-03-30 2012-03-30 Micro single-blade drill for machining printed circuit board (PCB) Pending CN103357925A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012100887976A CN103357925A (en) 2012-03-30 2012-03-30 Micro single-blade drill for machining printed circuit board (PCB)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012100887976A CN103357925A (en) 2012-03-30 2012-03-30 Micro single-blade drill for machining printed circuit board (PCB)

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Publication Number Publication Date
CN103357925A true CN103357925A (en) 2013-10-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103752910A (en) * 2013-12-31 2014-04-30 深圳市金洲精工科技股份有限公司 Miniature cutter
WO2017076092A1 (en) * 2015-11-04 2017-05-11 深圳市金洲精工科技股份有限公司 Drill bit for drilling pcb
WO2018058752A1 (en) * 2016-09-30 2018-04-05 深圳市金洲精工科技股份有限公司 Single-blade micro drill bit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001121332A (en) * 1999-10-25 2001-05-08 Nachi Fujikoshi Corp Twist drill
US20050135887A1 (en) * 2003-12-17 2005-06-23 Borschert Bernhard W. Twist drill
CN101767217A (en) * 2009-12-25 2010-07-07 深圳市金洲精工科技股份有限公司 Micro-bit and processing apparatus using the micro-bit
CN101791717A (en) * 2010-03-22 2010-08-04 深圳市金洲精工科技股份有限公司 Minitype drill bit and processing method thereof
CN202741802U (en) * 2012-03-30 2013-02-20 新野鼎泰电子精工科技有限公司 Miniature single-edge drill bit for processing printed circuit board

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001121332A (en) * 1999-10-25 2001-05-08 Nachi Fujikoshi Corp Twist drill
US20050135887A1 (en) * 2003-12-17 2005-06-23 Borschert Bernhard W. Twist drill
CN101767217A (en) * 2009-12-25 2010-07-07 深圳市金洲精工科技股份有限公司 Micro-bit and processing apparatus using the micro-bit
CN101791717A (en) * 2010-03-22 2010-08-04 深圳市金洲精工科技股份有限公司 Minitype drill bit and processing method thereof
CN202741802U (en) * 2012-03-30 2013-02-20 新野鼎泰电子精工科技有限公司 Miniature single-edge drill bit for processing printed circuit board

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103752910A (en) * 2013-12-31 2014-04-30 深圳市金洲精工科技股份有限公司 Miniature cutter
WO2017076092A1 (en) * 2015-11-04 2017-05-11 深圳市金洲精工科技股份有限公司 Drill bit for drilling pcb
WO2018058752A1 (en) * 2016-09-30 2018-04-05 深圳市金洲精工科技股份有限公司 Single-blade micro drill bit

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Application publication date: 20131023