CN202028809U

CN202028809U - Micro drill bit for processing printed circuit board

Info

Publication number: CN202028809U
Application number: CN2011200707480U
Authority: CN
Inventors: 王俊锋; 王雪峰; 陈明
Original assignee: XINYE DINGTAI ELECTRONIC FINE TECHNOLOGY CO LTD
Current assignee: XINYE DINGTAI ELECTRONIC FINE TECHNOLOGY CO LTD
Priority date: 2011-03-17
Filing date: 2011-03-17
Publication date: 2011-11-09
Anticipated expiration: 2021-03-17

Abstract

The utility model relates to a micro drill bit for processing a printed circuit board, which can be used for avoiding the phenomenon of drilling direction deviation of a processed printed circuit board when the printed circuit board is processed. The micro drill bit comprises a drill bit main body part which is integrated with a handle body, wherein the drill bit main body part is provided with a complete spiral main chip discharge groove; the pointed part of the drill bit is provided with two symmetrical main cutting blades; the head part of the drill bit is provided with a short groove; and the short groove is spirally formed on the back face of the spiral main chip discharge groove, starts from the pointed part of the drill bit and ends at a position cut through with the main cutting blades. By adopting the micro drill bit, the phenomenon of drilling direction deviation of a processed printed board under the same condition caused by the reduction in the diameter of the drill bit and unavailable assurance of the rigidity of the drill bit can be avoided, the service life can be prolonged by four times based on the original service life, and the pore wall roughness of all commercially-available printed boards with high requirements and high difficulty can met customer demand.

Description

The microbit of processing printed circuit board

Technical field

The utility model belongs to PCB microbit technical field, be specifically related to a kind of when processing printed circuit board, use can solve the microbit of processing printed circuit twist drill to the processing printed circuit board of off-set phenomenon.

Background technology

In processing printed circuit board (English name PCB) technique known, the finished product of PCB microbit mainly is to be processed into twisted shape (helical form) by the cylinder Hardmetal materials to form at present, processing the chip surface of two symmetries of two chip areas and tips forms, two chip surfaces and two chip areas constitute two cutting edges, chip surface and cutting edge are main chip-breaking processing PCB printed base plate, diameter is between 0.2mm-6.5mm, (at the following conventional bit that is referred to as), see Fig. 1, present continuous development along with market, bit diameter has the trend that reduces day by day, 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 satisfy market demands, diameter mainly is the following drill bit of bradawl ￠ 0.30mm, there is company of the same trade to research and develop again at present and improves above problem, release the single cutting bit (see figure 2), mainly be to change to a chip area by two former chip areas, the withdrawing portion of the front end of drill bit (tip just) constitutes by being linked to be a plurality of withdrawing faces, two withdrawing faces intersect first crest line that forms and are positioned at drill bit foremost, the axle center of the relative drill bit of this first crest line is in the rotating center section of drill bit with meeting at right angles, one end of this first crest line intersects second crest line that forms with two withdrawing faces and links to each other, and the outer end of this second crest line links to each other with major cutting edge portion, the other end of first crest line is towards the opposition side that is connected side with second crest line, by two little drill bits of chip area principal security rigidity in use, be not easy to occur the broken needle phenomenon, the tip mainly is the chip removal space that remedies a chip area by the improvement that two former main cutting edges become a cutting edge, and the processing printed board is bored to not departing from, so just can improve the indeterminable problem of conventional bit, and on the basis of the equal processing conditions of conventional bit, promote three work efficiency rates extraordinarily, but owing to have only a main cutting edge, wear and tear easily in the tip, the chip removal space is not enough, higher at ask for something, find hole slightly very big (Hole Wall Roughness) in the use of the printed board that difficulty is higher, rough, data are more than 40um, requirement is below the 25um, still can not meet customer need.

Summary of the invention

The purpose of this utility model be to overcome the deficiencies in the prior art and provide a kind of can solve since bit diameter diminish, 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 three times on the former basis, and allly on market have relatively high expectations, the microbit of processing printed circuit board that the Hole Wall Roughness phenomenon of printed board that difficulty is higher can both be met customer need.

The purpose of this utility model is achieved in that and comprises and handle bodily form all-in-one-piece drill main body portion, it is characterized in that: described drill main body portion has complete helical form master's chip area, there is the main cutting edge of two symmetries the tip of described drill bit, head at drill bit also has a short groove, this weak point groove helical form is opened in the back side of helical form master chip area, begins and end at the perforation with main cutting edge from the tip of drill bit.

Described short groove begins from the tip of drill bit that position in long 0.4-1.0mm scope is offered and is crossing with described helical form master's chip area.

Described short groove begins to offer in the position of long 0.8mm and intersect with described helical form master's chip area from the tip of drill bit.

Described short groove begins from the tip of drill bit to offer with interior position and intersect with described helical form master's chip area at long 0.4-1.0mm, and short simultaneously well width is in 0.2-0.5mm scope.

On the both sides of the described short groove in the tip of drill bit is the limit cutter of two symmetries.

The utlity model has following good effect: the utility model mainly is that two chip areas with former conventional bit make a complete chip area into, also have a short groove to intersect with interior position (optimum position) and this complete helical form master's chip area in the tip of drill bit at long 0.8mm, the tip of drill bit is still identical with the tip of conventional bit, the main cutting edge that two symmetries are still arranged, and have the limit cutter, such design has only a helical form master chip area, can significantly promote the rigidity of drill bit, the processing printed board under equal conditions occurring bores to the phenomenon that departs from, and the life-span can promote three times on the former basis, and just because of be a helical form master chip area, rigidity is improved significantly, when processing printed board, position, hole precision has surplus, can remedy the deficiency in chip removal space like this by the rigidity that reduces some drill bits a little, can also promote the flute length of drill bit like this, for example conventional bit is that 5.5mm is long, it is long that single cutting bit just can be 6.5mm, can promote the lamination number of printed board, promote client and get working (machining) efficiency, processing cost can reduce significantly, and the tip of drill bit is the same with conventional bit, the main cutting edge that two symmetries are arranged, aspect cutting, have only the single cutting bit of a main cutting edge sharp like this than above-described, make drill bit be not easy wearing and tearing, and the tip front end still has two chip areas of 0.8mm, the chip removal space is enough big, just can guarantee all having relatively high expectations, the hole of the printed board that difficulty is higher thick (Hole Wall Roughness) can reach in the 25um, can meet customer need, and the tip of the drill bit of this invention is the same with the tip of conventional bit, on the structure of tip, do not change, the client in use like this, 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 technology, equipment, can not increase cost in the staff training yet.There has been about 3 times raising in the life-span of drill bit of the present invention.

Description of drawings

Fig. 1 is the structural representation plane of conventional bit.

Fig. 2 is the tip configuration schematic plan view of conventional bit.

Fig. 3 is the single cutting bit structural representation in the known technology.

Fig. 4 is the single cutting bit tip configuration schematic diagram in the known technology.

Fig. 5 is the drill bit structure schematic diagram of the invention.

Fig. 6 is the tip configuration schematic diagram of the drill bit of the invention.

Fig. 7 is the invention and conventional bit contrast life-span variation schematic diagram.

The specific embodiment

Shown in Fig. 5,6, embodiment 1: a kind of microbit of processing printed circuit board, comprise and handle bodily form all-in-one-piece drill main body portion 1, in described drill main body portion 1, have complete helical form master's chip area 2, there is the main cutting edge 4 of two symmetries the tip of described drill bit, head at drill bit also has a short groove 3, and these weak point groove 3 helical forms are opened in the back side of helical form master chip area 2, begins and end at the perforation with main cutting edge 4 from the tip of drill bit.

Described short groove 3 begins from the tip of drill bit to offer with interior position and intersect with described helical form master's chip area 2 at long 0.4-1.0mm, and short simultaneously groove 3 width are in 0.2-0.5mm scope.On the both sides of the described short groove 3 in the tip of drill bit is the limit cutter 5 of two symmetries.

Embodiment 2: a kind of microbit of processing printed circuit board, comprise and handle bodily form all-in-one-piece drill main body portion 1, in described drill main body portion 1, have complete helical form master's chip area 2, there is the main cutting edge 4 of two symmetries the tip of described drill bit, head at drill bit also has a short groove 3, these weak point groove 3 helical forms are opened in the back side of helical form master chip area 2, begin and end at the perforation with main cutting edge 4 from the tip of drill bit.

Described short groove 3 begins from the tip of drill bit to offer in the position of long 0.8mm and intersect with described helical form master's chip area 2, and short simultaneously groove 3 width are 0.2,0.3,0.4 or 0.5mm.On the both sides of the described short groove 3 in the tip of drill bit is the limit cutter 5 of two symmetries.

Referring to Fig. 1,2, this conventional bit is to be processed into twisted shape (helical form) by the cylinder Hardmetal materials to form, processing the chip surface of two symmetries of two chip areas and tips forms, two chip surfaces and two chip areas constitute two cutting edges, and chip surface and cutting edge are main chip-breaking processing PCB printed base plate.

Referring to Fig. 3,4, two chip areas by conventional bit change to a chip area, the withdrawing portion of the front end of drill bit (tip just) constitutes by being linked to be a plurality of withdrawing faces, two withdrawing faces intersect first crest line that forms and are positioned at drill bit foremost, the axle center of the relative drill bit of this first crest line is in the rotating center section of drill bit with meeting at right angles, one end of this first crest line intersects second crest line that forms with two withdrawing faces and links to each other, and the outer end of this second crest line links to each other with major cutting edge portion, the other end of first crest line is towards the opposition side that is connected side with second crest line, by two little drill bits of chip area principal security bradawl head rigidity in use, be not easy to occur the broken needle phenomenon, the tip mainly is the chip removal space that remedies a chip area by the improvement that two former main cutting edges become a cutting edge.In the drawings 1 '-land, 2 '-main part 3 '-cutting blade 3A '-major cutting edge, 4 '-chip discharging grooves, 5 '-the first withdrawing faces, 6 '-the second withdrawing faces, 7 ' the-the 3rd withdrawing faces, 8 '-the first withdrawing face of tossing about, 9 '-the second withdrawing face of tossing about, 10 '-constitute first crest line of chisel edge, 11 '-constitute second crest line of chisel edge, 12 ', 13 '-to the crest line of drill bit periphery, the axle center of O-drill bit, Y-and the parallel line of crest line that passes through axle center O.

Referring to Fig. 5,6, make two chip areas of conventional bit into a complete chip area, also have a short groove to intersect with interior position and this complete chip area at long 0.8mm in the tip of drill bit, the tip of drill bit is still identical with the tip of conventional bit, main cutting edge and limit cutter that two symmetries are still arranged, the limit cutter can also play the chip removal effect under the condition that rigidity can satisfy, reduce Hole Wall Roughness.Single cutting bit of the present utility model as can be seen all satisfies customer requirement at diameter less than position, hole precision, life-span, the Hole Wall Roughness of the microbit of 0.30mm, and has significantly and promote.

Claims

1. the microbit of a processing printed circuit board, comprise and handle bodily form all-in-one-piece drill main body portion (1), it is characterized in that: described drill main body portion (1) has complete helical form master's chip area (2), there is the main cutting edge (4) of two symmetries the tip of described drill bit, head at drill bit also has a short groove (3), this weak point groove (3) helical form is opened in the back side of helical form master chip area (2), begins and ends at from the tip of drill bit and the perforation of main cutting edge (4).

2. the microbit of processing printed circuit board according to claim 1 is characterized in that: described short groove (3) begins from the tip of drill bit that position in long 0.4-1.0mm scope is offered and is crossing with described helical form master's chip area (2).

3. the microbit of processing printed circuit board according to claim 2 is characterized in that: described short groove (3) begins to offer in the position of long 0.8mm and intersect with described helical form master's chip area (2) from the tip of drill bit.

4. the microbit of processing printed circuit board according to claim 1, it is characterized in that: described short groove (3) begins from the tip of drill bit to offer with interior position and intersect with described helical form master's chip area (2) at long 0.4-1.0mm, and short simultaneously groove (3) width is in 0.2-0.5mm scope.

5. the microbit of processing printed circuit board according to claim 1, it is characterized in that: the both sides of described short groove (3) are the limit cutter (5) of two symmetries in the tip of drill bit.