CN102794485B - Flat head drill and processing method thereof - Google Patents
Flat head drill and processing method thereof Download PDFInfo
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- CN102794485B CN102794485B CN201210303124.8A CN201210303124A CN102794485B CN 102794485 B CN102794485 B CN 102794485B CN 201210303124 A CN201210303124 A CN 201210303124A CN 102794485 B CN102794485 B CN 102794485B
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- homalocephalus
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Abstract
The invention discloses a flat head drill and a processing method thereof. The flat head drill comprises a main cutting edge, a chisel edge, a main chip groove corresponding to the main cutting edge, and multiple back tool faces, wherein a flat head face, which extends to a base end from a drill tip end of the flat head drill, is arranged on one side opposite to the main cutting edge, and the flat head face is intersected with the back tool faces on a drill tip at the drill tip place so as to form an additional cutting edge opposite to the main cutting edge. According to the invention, the flat head face is arranged on the drill tip of the drill with one main chip groove, and the flat head surface forms the additional cutting edge opposite to the main cutting edge at the drill tip, so that when the drill is used for drilling, the main cutting edge on the drill tip and the additional cutting edge are respectively stressed, thus the stress balance at the drill tip is improved, the overlarge radial force due to only one cutting edge is avoided, and the hole position precision is improved; meanwhile, through setting the flat head face, a contact area of a big head end of the flat head drill and the hole wall is reduced, thus frictional heating is reduced.
Description
Technical field
The present invention relates to PCB manufacture field, in particular, relate to a kind of homalocephalus and bore.
Background technology
Along with the development of printed circuit board (pcb) technology and product, carbide drill demand increases year by year, and novel hard alloy drill bit constantly occurs, also more and more higher to the requirement of carbide drill.Carbide drill for PCB (being called for short the micro-brill of PCB) is a kind of complex-shaped band spiral fluted capillary processing instrument, derivative by traditional fluted drill.The micro-brill size of PCB is small, and its apex point structure will just can be observed by light microscope.Current most of PCB producer carrys out processing PCB plate with numerical control drilling machine, and digital control hole drilling is the important step of printed board processing procedure, and carbide drill is the key factor that determines drilling quality and efficiency.
Properties of product, the quality requirements of client to PCB drill bit is more and more higher, and conventional products can not be met customer need.As shown in Figure 1-Figure 3, at present conventional PCB drill bit is all the chip area 10 that has two symmetrical main cutting edges 11, two symmetric helixes, symmetrical two groups of major first flanks 12 and the second rear knife face 13 conventionally.
Along with the brill footpath requirement of microbit is more and more less, the bradawl easy breaking of rod on first watch, and conventional bit two helicla flute forms have weakened drill bit rigidity, and better in the urgent need to a kind of rigidity intensity, the especially better microbit of rigidity intensity under the condition of bradawl footpath.In China's application that the applicant was once 201110194374.8 at application number, mention a kind of hog nose, its objective is as strengthening and bore body intensity, reduce the possibility of the breaking of rod.Be as Figure 4-Figure 6, hog nose only has a main cutting edge 21,, the main chip area corresponding with main cutting edge 21 20, a chisel edge 30,3 above rear knife faces are (as knife face after being five in figure, be respectively: major first flank 22, the second rear knife face 23, the 3rd rear knife face 24, the 4th rear knife face 25, the 5th rear knife face 26), all rear knife faces meet at an apex point.As shown in Figure 5, described hog nose only has one to run through the main chip area 20 that drill body part divides.The object of only establishing a main chip area 20 is that the core of raising brill body is thick, thereby improve the intensity of drill bit, but, because the cutting edge of hog nose is independent one, under apex point, bore stressedly and uneven, can derive radial load, affect position, hole precision, therefore, hog nose is unfavorable for the further raising of position, hole precision.
Summary of the invention
It is high that technical problem to be solved by this invention is to provide a kind of body intensity of boring, and the homalocephalus that machining hole position precision is high bores.
The object of the invention is to be achieved through the following technical solutions: a kind of homalocephalus bores, and comprising: a main cutting edge, a chisel edge, a spiral helicine main chip area corresponding with described main cutting edge and multiple rear knife face; A side relative with described main cutting edge, is provided with the homalocephalus face that an apex point end being bored by homalocephalus extends to cardinal extremity, and described homalocephalus face is attached cutting sword relative with described main cutting edge of formation crossing with rear knife face on apex point at apex point place; Described homalocephalus face ends in and bores body surface.
Preferably, described homalocephalus face is concave surface, and the shape of described attached cutting sword and described main cutting edge are with respect to apex point summit symmetry.The apex point that homalocephalus is bored is identical with the structure of double cutting drill, and then makes homalocephalus drilling tool have higher machining hole position precision.
Preferably, described homalocephalus face bores body central shaft with respect to described homalocephalus is extended to boring body cardinal extremity by apex point by fixing taper angle, and finally ends in brill body surface.By having the extension of fixing taper angle and finally ending in the surface of boring body, thereby the most core of brill body that homalocephalus is bored is thick thicker with respect to two-groove drill, has ensured to bore the intensity of body.
Preferably, described fixing taper angle preferable range is 0.8 °～4 °.Avoid homalocephalus long and have influence on the intensity of boring body towards boring distance that body cardinal extremity extends.
Preferably, described homalocephalus face bores body central shaft with respect to described homalocephalus is extended to boring body cardinal extremity by apex point by gradual change taper angle, and finally ends in brill body surface.The homalocephalus face extending by gradual change tapering angular drill body cardinal extremity can be in beginning, apex point place with less taper angle to downward-extension, improve the cutting power of attached cutting sword, and then continue to extend and finally end in the surface of boring body to become gradually large taper angle, thereby the thick intensity that has ensured to bore body of core that has so also ensured to bore body.
Preferably, described main chip area comprises: leading portion chip area and back segment chip area, the width of described back segment chip area is greater than the width of described leading portion chip area.Improve the locomotivity of drilling cuttings on back segment chip area, and then improve the chip removal ability that homalocephalus bores.
Preferably, the width of described back segment chip area is the twice of the width of described leading portion chip area.Can obtain more excellent chip removal ability and bore body intensity.
Preferably, 0.2～0.8 times of the length that described leading portion chip area is described main chip area.So that the drilling cuttings in leading portion chip area can enter back segment chip area in time, discharge drilling cuttings pressure.
Preferably, described homalocephalus face is concave surface, and described homalocephalus face formed attached cutting sword crossing with described rear knife face and described main cutting edge are asymmetric setting with respect to described apex point summit.The core that improves brill body stub end is thick.
The processing method that above-mentioned homalocephalus bores, comprises step:
On bar, grind the step of main chip area with slot grinding emery wheel;
On bar, grind the step of major first flank, the second rear knife face, the 3rd rear knife face and the 4th rear knife face with sharpening emery wheel;
On bar, grind the step of homalocephalus face with slot grinding emery wheel.
The present invention is because the apex point place of the drill bit only having a main chip area has offered a homalocephalus face, this homalocephalus face forms an attached cutting sword relative with main cutting edge at apex point place, in the time that drill bit is holed, main cutting edge on apex point and attached cutting sword are stressed respectively, and then the stress balance at raising apex point place, avoid, owing to only having a cutting edge to produce excessive radial load, having improved position, hole precision; Meanwhile, homalocephalus face is set the contact area of homalocephalus brill stub end and hole wall is reduced, thereby reduce frictional heating.
Brief description of the 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 a kind of structural representation of apex point of hog nose;
Fig. 5 be a kind of hog nose drill bit profile;
Fig. 6 is a kind of overall structure schematic diagram of hog nose;
Fig. 7 is the drill bit structure schematic diagram of the embodiment of the present invention one;
Fig. 8 is the head schematic diagram that the homalocephalus of the embodiment of the present invention one bores;
Fig. 9 be the homalocephalus face that bores of the homalocephalus of the embodiment of the present invention one with brill body central axis between relative position schematic diagram;
Figure 10 is that the homalocephalus face of the invention process one and embodiment bis-is with respect to the angle schematic diagram of brill body central axis;
Figure 11 is that the brill core of the embodiment of the present invention one changes schematic diagram;
Figure 12 is that the groove width of the embodiment of the present invention one changes schematic diagram;
Figure 13 is that the homalocephalus of the embodiment of the present invention three bores structural representation;
Figure 14 is the apex point structural representation that the homalocephalus of the embodiment of the present invention three bores;
Figure 15 is the brill cored structure schematic diagram that the homalocephalus of the embodiment of the present invention three bores.
The Reference numeral of Fig. 1-Fig. 6:
10, chip area; 11, main cutting edge, 12, major first flank, 13, the second rear knife face, 20, chip area, 21, main cutting edge, 22, major first flank, 23, the second rear knife face, 24, the 3rd rear knife face; 25, the 4th rear knife face, 26, the 5th rear knife face, 27, the 6th rear knife face, 28, the 7th rear knife face, 30, chisel edge, 31, back-off, 32, wall limit, 33, front cutting edge,
The Reference numeral of Fig. 7-Figure 15:
7, chisel edge, 30, main chip area, 31, main cutting edge, 32, major first flank, 33, the second rear knife face, 40, homalocephalus face, 41, attached cutting sword, 42, the 3rd rear knife face 43, the 4th rear knife face, 44, L shaped side edge, 101, central axis, 301, back segment chip area, 302, leading portion chip area.
Detailed description of the invention
The invention provides a kind of homalocephalus and bore, it is mainly applicable to PCB manufacture field, and this homalocephalus bores and comprises: a main cutting edge, a chisel edge and a main chip area corresponding with described main cutting edge; A side relative with described main cutting edge, is provided with the homalocephalus face that an apex point end being bored by homalocephalus extends to cardinal extremity, and described homalocephalus face is attached cutting sword relative with described main cutting edge of formation crossing with rear knife face on apex point at apex point place.
Below in conjunction with accompanying drawing and preferred embodiment, the invention will be further described.
As shown in Figure 1-Figure 3, at present conventional PCB drill bit is all the chip area 10 that has two symmetrical 11, two symmetric helixes of main cutting edge, symmetrical two groups of major first flanks 12 and the second rear knife face 13 conventionally; The apex point of such drill bit is stress equalization in the time of lower brill, thereby lower brill is stable, can obtain good position, hole precision.Be illustrated in figure 6 a kind of hog nose scheme proposing before applicant, hog nose has advantages of that the body of boring intensity is high, but, because the cutting edge of hog nose is independent one, under apex point, bore stressedly and uneven, can derive radial load, affect position, hole precision, therefore, hog nose is unfavorable for the further raising of position, hole precision.Be illustrated in figure 7 homalocephalus of the present invention and bore, it mainly improves on the basis based on hog nose, and object is to make drill bit to have hog nose and bores body intensity, has again the machining accuracy performance that multiple-cutting-edge bores.
Embodiment mono-
Be illustrated in figure 7 first embodiment of the present invention, homalocephalus shown in figure bore only have main chip area that 31, one of main cutting edges are corresponding with main cutting edge 31 30, a chisel edge 7; On apex point, be provided with major first flank 32, the second rear knife face 33, the 3rd rear knife face 42 and the 4th rear knife face 43; Described main chip area 30 and major first flank 32 and the crossing formation of the 3rd rear knife face 42 main cutting edge 31, in a side relative with main cutting edge 31, be provided with the homalocephalus face 40 that an apex point end (stub end) being bored by homalocephalus extends to cardinal extremity, this homalocephalus face 40 is at apex point place and the second rear knife face 33 on apex point and the 3rd rear knife face 42 is crossing and then one article of attached cutting sword 41 relative with described main cutting edge 31 of formation.Like this, just form an attached cutting sword 41 relative with main cutting edge 31 in brill body head end, thereby in the time that drill bit is holed, make main cutting edge 31 and attached cutting sword 41 on apex point stressed respectively, and then the stress balance at raising apex point place, avoid producing excessive radial load, improved position, hole precision; Meanwhile, homalocephalus face 40 is set the contact area of homalocephalus brill stub end and hole wall is reduced, thereby reduce frictional heating.
As shown in Figure 8, additional homalocephalus face 40 is a concave surface, and the homalocephalus face 40 of concavity can shorten the length of apex point chisel edge 7, thereby reduces the lateral stressed of apex point.Simultaneously, use another object of concave surface to be to make the shape of rear knife face on apex point and the attached cutting sword 41 of the crossing formation of described homalocephalus face 40 and the main cutting edge 31 summit symmetry with respect to apex point, that is to say, the shape of attached cutting sword 41 and size are identical with main cutting edge 31 and with respect to the summit symmetry of apex point, thereby in the formation of apex point place and the apex point structure with two main cutting edges 11 as described in Figure 1, further improved the stress balance at apex point place, the borehole accuracy that homalocephalus is bored further improves.
As shown in Figure 9, the apex point end that homalocephalus face 40 is bored by homalocephalus extends to cardinal extremity, and final termination and brill body surface, Figure 10 shows homalocephalus face 40 with respect to the situation of change of boring body central axis 101, wherein, Figure 10 a be the homalocephalus face 40 of the present embodiment with respect to the situation of change of boring body central axis 101, homalocephalus face 40 bores body central axis 101 with respect to homalocephalus is extended to boring body cardinal extremity by apex point by fixing taper angle, and finally ends on brill body surface.Wherein, the scope of fixing taper angle can be chosen within the scope of 0.5 °～10 °, preferably 0.8 °～4 ° of the present embodiment, have influence on the intensity of brill body so that the distance that the distance that homalocephalus face 40 extends to brill body cardinal extremity, in comparatively rational scope, avoids homalocephalus face 40 to extend to brill body cardinal extremity is long.Certainly, also can select larger taper angle, and then the attached cutting sword obtaining can better provide shear action and share certain cutting stressed.By such setting, making homalocephalus face 40 can only have influence on homalocephalus, to bore the core of body part thick, and all the other parts that are not subject to homalocephalus face 40 and affect are still possessed compared with thick brill core and had higher intensity; Meanwhile, the homalocephalus face 40 being extended by fixing taper angle to cardinal extremity by apex point end bores body surface owing to finally ending in, thereby with it boring, thick to the core of the direction of cardinal extremity by apex point end is to become gradually large.Figure 11 shows brill and has the thick schematic diagram of core of homalocephalus face with it, and as can be seen from Figure, the thickness that bores core is to become gradually large.
As shown in Figure 7, homalocephalus face 40 extends in apex point and bores to the cardinal extremity that bores body and forms a L shaped side edge 44 with it, and this L shaped side edge 44 is formed by a section of attached cutting sword 41 and the intersection on homalocephalus face 40 and brill body surface.This L shaped side edge 44 mainly plays smear metal guide effect and auxiliary smear metal effect, and reduce drill bit tip and hole wall contact area in working angles, reduces frictional heating.
As shown in figure 12, the chip removal ability boring in order to improve homalocephalus, is divided into two sections by main chip area 30, respectively: leading portion chip area 302 and back segment chip area 301, wherein, the width S 2 of back segment chip area 301 is greater than the width S 1 of leading portion chip area 302.Like this, under high-speed cutting because back segment chip area 301 width are larger, the width of leading portion chip area 302 is less, the apex point end that drilling cuttings is bored at homalocephalus is that the suffered extruding force of stub end is larger, and pressure is discharged in the time of back segment chip area 301, extrusion friction between drilling cuttings and back segment chip area 301 also diminishes, thereby improves the locomotivity of drilling cuttings on back segment chip area 301, and then improves the chip removal ability that homalocephalus bores.In the present embodiment, the width S 2 of back segment chip area 301 is 1.1 to 2 times of width S 1 of leading portion chip area 302; The present embodiment provides the concrete numerical value of three kinds of back segment chip areas 301 with respect to leading portion chip area 302 width, is respectively: 1.5 times, 2 times and 2.5 times.In the time that the width of back segment chip area 301 is 1.5 times of leading portion chip area 302, can avoid excessive back segment chip area 301 to have influence on the intensity of boring body; When the width of back segment chip area 301 is that 2 times of leading portion chip area 302 can obtain more excellent chip removal ability; In the time that the width of back segment chip area 301 is 2.5 times of leading portion chip area 302, although chip removal ability is improved, can have influence on the intensity of boring body.In the present embodiment, the length of leading portion chip area 302 is 0.2～0.8 times of length (being the overall length of leading portion chip area 302 and back segment chip area 301) of main chip area 30, so that the drilling cuttings in leading portion chip area 302 can enter back segment chip area 301 in time, discharge drilling cuttings pressure.
Embodiment bis-
As Figure 10 b is depicted as the second embodiment of the present invention, different from embodiment mono-, homalocephalus face 40 bores body central axis 101 with respect to described homalocephalus is extended to boring body cardinal extremity by apex point by gradual change taper angle, and finally ends in the surface of boring body.The homalocephalus face 40 extending by gradual change tapering angular drill body cardinal extremity can be in beginning, apex point place with less taper angle to downward-extension, the second rear knife face and the 3rd rear knife face are strengthened with the crossing angle of homalocephalus face 40, thereby improve the cutting power of attached cutting sword, and then continue to extend and finally end in the surface of boring body to become gradually large taper angle, thereby the thick intensity that has ensured to bore body of core that has so also ensured to bore body.
Embodiment tri-
Be embodiments of the invention three as shown in FIG. 13 and 14, different from embodiment mono-and embodiment bis-is, homalocephalus face 40 is symmetrically arranged with respect to apex point summit right and wrong with shape and the described main cutting edge 31 of described the second rear knife face 33 and crossing the formed attached cutting sword of the 3rd rear knife face 42, be homalocephalus face 40 with respect to main cutting edge 31 deflection certain angle settings so that homalocephalus face 40 with respect to thick being improved of core between main chip area 30, avoid causing between main chip area 30 to produce compared with thin core is thick and having influence on the brill body intensity that homalocephalus bores due to homalocephalus face 40 being set.As shown in figure 15, section B-B shows the thickness of the brill core after homalocephalus deflecting facet, the thin location that it avoids Liao Zuanshen center, and making to bore body thickness can be larger.In the present embodiment, homalocephalus face 40 with respect to the optional scope of angle of main cutting edge 31 polarizations is: 120 °～160 °; And other some outbalances, St value as shown in figure 10 can not be zero, to guarantee that main cutting edge 31 has the enough thick knife back, guarantees that main cutting edge 31 can bear enough large pressure in cutting.
The processing method that the present invention provides described homalocephalus to bore simultaneously, comprises step:
On bar, grind the step of main chip area with slot grinding emery wheel;
On bar, grind the step of major first flank, the second rear knife face, the 3rd rear knife face and the 4th rear knife face with sharpening emery wheel;
On bar, grind the step of homalocephalus face with slot grinding emery wheel.
The step of wherein, grinding main chip area comprises respectively the step of mill leading portion chip area and back segment chip area.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For 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 (10)
1. a homalocephalus bores, and it is characterized in that, comprising: a main cutting edge, a chisel edge, a spiral helicine main chip area corresponding with described main cutting edge and multiple rear knife face; A side relative with described main cutting edge, is provided with the homalocephalus face that an apex point end being bored by homalocephalus extends to cardinal extremity, and described homalocephalus face is attached cutting sword relative with described main cutting edge of formation crossing with rear knife face on apex point at apex point place; Described homalocephalus face ends in and bores body surface.
2. a kind of homalocephalus as claimed in claim 1 bores, and it is characterized in that, described homalocephalus face is concave surface, and the shape of described attached cutting sword and described main cutting edge are with respect to apex point summit symmetry.
3. a kind of homalocephalus as claimed in claim 2 bores, and it is characterized in that, described homalocephalus face bores body central axis with respect to described homalocephalus is extended to boring body cardinal extremity by apex point by fixing taper angle.
4. a kind of homalocephalus as claimed in claim 3 bores, and it is characterized in that, described fixing taper angle preferable range is 0.8 °～4 °.
5. a kind of homalocephalus as claimed in claim 2 bores, and it is characterized in that, described homalocephalus face bores body central axis with respect to described homalocephalus is extended to boring body cardinal extremity by apex point by gradual change taper angle.
6. a kind of homalocephalus as claimed in claim 1 bores, and it is characterized in that, described main chip area comprises: leading portion chip area and back segment chip area, the width of described back segment chip area is greater than the width of described leading portion chip area.
7. a kind of homalocephalus as claimed in claim 6 bores, and it is characterized in that, the width of described back segment chip area is the twice of the width of described leading portion chip area.
8. a kind of homalocephalus as claimed in claim 6 bores, and it is characterized in that 0.2～0.8 times of the length that described leading portion chip area is described main chip area.
9. a kind of homalocephalus as claimed in claim 1 bores, and it is characterized in that, described homalocephalus face is concave surface, and described homalocephalus face is asymmetric setting with shape and the described main cutting edge of crossing the formed attached cutting sword of described rear knife face with respect to described apex point summit.
10. the processing method that as described in as arbitrary in claim 1-9, homalocephalus bores, comprises step:
On bar, grind the step of main chip area with slot grinding emery wheel;
On bar, grind the step of major first flank, the second rear knife face, the 3rd rear knife face and the 4th rear knife face with sharpening emery wheel;
On bar, grind the step of homalocephalus face with slot grinding emery wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210303124.8A CN102794485B (en) | 2012-08-24 | 2012-08-24 | Flat head drill and processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210303124.8A CN102794485B (en) | 2012-08-24 | 2012-08-24 | Flat head drill and processing method thereof |
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| CN102794485A CN102794485A (en) | 2012-11-28 |
| CN102794485B true CN102794485B (en) | 2014-08-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108466019A (en) * | 2018-03-13 | 2018-08-31 | 上海绿幽环保设备有限公司 | A kind of processing method of buttferfly-type carpenter's auger hole making drill |
| CN112404527A (en) * | 2020-12-18 | 2021-02-26 | 江苏博安工具有限公司 | Can dismantle and add and connect handle twist drill |
| CN113560635A (en) * | 2021-08-20 | 2021-10-29 | 厦门厦芝科技工具有限公司 | Double-edge single-groove drill bit |
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