CN203679362U - Minitype drill bit - Google Patents
Minitype drill bit Download PDFInfo
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- CN203679362U CN203679362U CN201320893390.0U CN201320893390U CN203679362U CN 203679362 U CN203679362 U CN 203679362U CN 201320893390 U CN201320893390 U CN 201320893390U CN 203679362 U CN203679362 U CN 203679362U
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- helicla flute
- cutting edge
- groove
- biasing groove
- tool face
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Abstract
The utility model discloses a minitype drill bit and a machining method of the minitype drill bit. The minitype drill bit comprises a first front tool face, a first rear tool face, a second front tool face, a second rear tool face, a first spiral groove, a second spiral groove and an eccentric groove, wherein the first front tool face, the first rear tool face, the second front tool face, and the second rear tool face are arranged at the position of a drill point, the first spiral groove extends towards a drill tail from the drill point, the first spiral groove and the second spiral groove are arranged symmetrically, the first spiral groove and the first front tool face intersect to form a first cutting edge, the second spiral groove and the second front tool face intersect to form a second cutting edge, the eccentric groove is formed in a big end area of the drill bit, the eccentric groove and the second front tool face intersect, so that the second cutting edge is shorter than the first cutting edge, and the eccentric groove and the second spiral groove intersect. According to the minitype drill bit, due to the fact that the eccentric groove is formed in a well drilling area of the drill bit, air in an area where the drill point is located of the second spiral groove can be sucked away by a dust collection device in an accelerating mode, and the cooing efficiency is improved; meanwhile, another cooling surface is formed by the eccentric groove, and efficiency of heat exchange between the drill point and the air is improved.
Description
Technical field
The utility model relates to min-cutter field, in particular, relates to a kind of microbit.
Background technology
Micropore is one of important component part of PCB, and the micropore after electroplating plays the supporting role of electric interconnection and element in PCB, and micropore can be divided into two large classes: through hole and blind hole (buried via hole can be regarded the one of through hole as).Blind hole is mainly present in HDI plate, and through hole is mainly present in list/dual platen, multi-layer sheet, soft board and base plate for packaging.In recent years, base plate for packaging relies on can realize many pinizations, dwindle encapsulating products area, improve electrical property and thermal diffusivity, realize the outstanding advantages such as densification, taking FC base plate for packaging high speed development as distinguishing feature, high-caliber MCM (multi-chip package) and SIP (system in package) obtain large development and expand rapidly with CSP base plate for packaging, widely popular, smart mobile phone, the panel computer particularly produced taking apple, Samsung are applied as the base plate for packaging of representative, have obtained brilliant sales achievement in consumption electronic products field.In IC encapsulation, fully use high-density multi-layered substrate technical elements, and (base plate for packaging cost accounts for 40%-50% as an example of BGA example to reduce the manufacturing cost aspect of base plate for packaging, aspect FC substrate manufacturing costs, accounting for 70%-80%), man of major country of production, area have formed the situation of keen competition.Base plate for packaging has become one of a country, area important " weapon " in development microelectronic industry.
The more common sheet material machine drilling processing of base plate for packaging aperture is finer, drill hole density is higher, the required precision of position, hole is higher, lamination number is more, and this major effect that boring is brought is:
1) because dust discharge is bad, apex point excessive heating, cause breaking.2) position, hole precision is bad.
Chinese patent application: ZL200510105356 proposes a kind of drill bit structure, it comprises: the first helicla flute and the second helicla flute, this first helicla flute is arranged on respect to non-centrosymmetry position, bit center (the relative pivot angle of two helicla flutes is set as being greater than 40 ° and is less than 180 °) with the second helicla flute, the first helicla flute land minister degree is greater than the second helicla flute, and the second helicla flute is blind slot, and the second helicla flute does not extend to brill tail.
Above-mentioned design brings two problems: 1) helicla flute is with respect to pivot non-centrosymmetry, apex point part barycenter off-axis is excessive, drill jig easily causes excessive swing while being held on lathe High Rotation Speed, thereby affecting position, hole precision further improves, 2) the second helicla flute flute length is shorter than the first helicla flute, and be blind slot, smear metal is easily gathered in blind slot, cause with hole wall dry friction and generate heat, when the first helicla flute is born too much chip removal, the space that dust catcher on drilling machine siphons away air in groove further reduces, thereby affects apex point heat radiation.
Utility model content
Technical problem to be solved in the utility model is to provide one, dust discharge is good, the high microbit of position, hole precision.
The purpose of this utility model is achieved through the following technical solutions: a kind of microbit, comprising:
Be arranged on major first face, major first flank, the second rake face, the second rear knife face of apex point position;
By apex point to bore the first helicla flute that tail direction extends and with symmetrically arranged the second helicla flute of described the first helicla flute, described the first helicla flute formation first cutting edge crossing with described major first face, described the second helicla flute and crossing formation the second cutting edge of described the second rake face;
And a biasing groove that is arranged on the front end area of drill bit, this biasing groove is crossing with described the second rake face, makes the length of described the second cutting edge be less than the length of described the first cutting edge, and this biasing groove is crossing with described the second helicla flute.
Preferably, described biasing groove is also crossing with described the second rear knife face, makes described the second rear knife face and the length of the intersection of brill body be less than the fabric width of cutter.Further strengthen area and the space of biasing groove, thereby further improve radiating efficiency, and dust exhaust apparatus is drawn the efficiency of air.
Preferably, described the second rear knife face is more than or equal to zero with the length of the intersection of boring body.In the time that intersection is zero, setover groove and the first helicla flute produced crossingly, and like this, dust exhaust apparatus is drawn the Capacity extension of air to the first helicla flute region, thereby hot-air can be gone out as soon as possible by absorption, improve radiating efficiency, certainly, according to the concrete model of drill bit, as diameter, in the situation that guaranteeing apex point intensity, the length of this intersection of adjustment that can be corresponding, avoids apex point strength decreased.
Preferably, the length of described the second cutting edge is more than or equal to zero.In the time that the length of the second cutting edge equals zero, the second cutting edge completely loses cutting function, thus the second spiral fluted draw the efficiency of air and reach high state, radiating efficiency is better.
Preferably, described biasing groove extends to this second spiral fluted inside by described the second spiral fluted outside, and biasing groove and the second spiral fluted intersecting area are less than this second spiral fluted width, and the degree of depth of biasing groove is greater than the second spiral fluted degree of depth.Can make like this dust exhaust apparatus accelerate to siphon away the air in apex point region, improve radiating efficiency.
Preferably, the width of described biasing groove is greater than described the second spiral fluted width, and covers the second helicla flute region.Further raising dust exhaust apparatus siphons away the air in apex point region, improves radiating efficiency.
Preferably, the angle α at the edge of described biasing groove and described the second spiral fluted edge is: 90 ° of 180 ° >=α >.
Preferably, the helical angle of described biasing groove is identical with described the second spiral fluted helical angle.According to boring the structural strength demand of body, it is relatively consistent that this kind of structure can guarantee that the thickness of core is bored in apex point region.
Preferably, the helical angle of described biasing groove is different from described the second spiral fluted helical angle.Different process requirements, in the situation that proof strength reaches, in situations as different in the required precision of position, hole, can adopt this kind of structure, to meet the requirement of cutting precision.
As the above the processing method of microbit of claim, comprise step:
S1, grinding apex point structure, the first helicla flute and the second helicla flute;
S2, grinding biasing groove.
The utility model is owing to being provided with biasing groove in the front end area of drill bit, and this biasing groove is crossing with described the second rake face, makes the length of described the second cutting edge be less than the length of described the first cutting edge, and this biasing groove is crossing with described the second helicla flute.The length of the second cutting edge is less than after the length of the first cutting edge, the smear metal ability of the second cutting edge reduces even to be lost, and the second spiral fluted smear metal is reduced even not to be had, like this, what dust exhaust apparatus can accelerate siphons away the air in the second helicla flute apex point region, thereby improves radiating efficiency.Meanwhile, biasing groove has also formed a larger radiating surface, improves the heat exchange efficiency of apex point and air, accelerates to draw under the effect of air at dust exhaust apparatus, makes radiating efficiency be able to further raising.
Brief description of the drawings
Fig. 1 is the apex point structural representation of the utility model embodiment mono-,
Fig. 2 is the brill body front-end architecture schematic diagram of the utility model embodiment mono-,
Fig. 3 is the brill body front-end architecture schematic diagram of the utility model embodiment mono-,
Fig. 4 is the brill body front-end architecture schematic diagram of the utility model embodiment mono-,
Fig. 5 is the brill body front-end architecture schematic diagram of the utility model embodiment mono-,
Fig. 6 is the apex point structural representation of the utility model embodiment bis-,
Fig. 7 is the brill body front-end architecture schematic diagram of the utility model embodiment bis-,
Fig. 8 is the apex point structural representation of the utility model embodiment tri-,
Fig. 9 is the brill body front-end architecture schematic diagram of the utility model embodiment tri-,
Figure 10 is the apex point structural representation of the utility model embodiment tetra-,
Figure 11 is the brill body front-end architecture schematic diagram of the utility model embodiment tetra-.
Detailed description of the invention
The several embodiment that provide for the utility model as described in Fig. 1-10, microbit comprises: the major first face 111, major first flank 112, the second rake face 121, the second rear knife face 122 that are arranged on apex point position; By apex point to bore the first helicla flute 10 that tail direction extends and with symmetrically arranged the second helicla flute 20 of described the first helicla flute, described the first helicla flute 10 formation first cutting edge 110 crossing with described major first face 111, described the second helicla flute 20 and crossing formation the second cutting edge 120 of described the second rake face 121; An and biasing groove 30 that is arranged on the front end area position of drill bit, this biasing groove 30 is crossing with described the second rake face 121, make the length of described the second cutting edge 120 be less than the length of described the first cutting edge 110, this biasing groove 30 is crossing with described the second helicla flute 20.The length of the second cutting edge 120 is less than after the length of the first cutting edge 110, the smear metal ability of the second cutting edge 120 reduces even to be lost, the smear metal minimizing of the second helicla flute 20 is not even had, like this, what dust exhaust apparatus can accelerate siphons away the air in the second helicla flute apex point region, thereby improves radiating efficiency.Meanwhile, biasing groove 30 has also formed a larger radiating surface, improves the heat exchange efficiency of apex point and air, accelerates to draw under the effect of air at dust exhaust apparatus, makes radiating efficiency be able to further raising.
The utility model provides the processing method of above-mentioned drill bit simultaneously, concrete, comprise step: S1, according to the structure of existing drill bit, grind structure (comprising major first face 111, major first flank 112, the second rake face 121, the second rear knife face 122) and the first helicla flute and second helicla flute of apex point; S2, on S1 basis, grinds biasing groove.
Below in conjunction with accompanying drawing and preferred embodiment, the utility model is described in further detail.
Embodiment mono-
As shown in Figure 1 to Figure 3, microbit comprises: the major first face 111, major first flank 112, the second rake face 121, the second rear knife face 122 that are arranged on apex point position; By apex point to bore the first helicla flute 10 that tail direction extends and with symmetrically arranged the second helicla flute 20 of described the first helicla flute, described the first helicla flute 10 formation first cutting edge 110 crossing with described major first face 111, described the second helicla flute 20 and crossing formation the second cutting edge 120 of described the second rake face 121; An and biasing groove 30 that is arranged on the front end area position of drill bit, as shown in Figure 5, this biasing groove 30 is crossing with described the second rake face 121, makes the length L 1 of described the second cutting edge 120 be less than the length L 2 of described the first cutting edge 110, and this biasing groove 30 is crossing with described the second helicla flute 20.The degree of depth of biasing groove 30 is the degree of depth that are greater than the second chip area 20, can expand like this biasing slot space in drill bit region, makes dust collection efficiency faster, and the air in apex point region can be swapped out faster.
In the present embodiment, biasing groove 30 is also crossing with the second rear knife face 122, as shown in Figure 3, make like this second rear knife face 122 and the length L 3 of the intersection of brill body be less than the fabric width L4 of cutter, thereby further strengthen area and the space of biasing groove, further improve the efficiency of radiating efficiency and dust exhaust apparatus absorption air.The value of the present embodiment intersection is greater than zero, and specifically the value of intersection, according to the concrete model setting of drill bit, as diameter, is being guaranteed under the prerequisite of apex point intensity, and the size of adjustment intersection that can be corresponding, avoids apex point strength decreased.
Very little of the length of described the second cutting edge 120 in the present embodiment, to such an extent as to its substantial loss cutting power, like this, the resistance that dust exhaust apparatus is drawn air reduces, the efficiency of drawing air is improved, corresponding, radiating efficiency is also improved.
In the present embodiment, as shown in Figure 4, the angle α at the edge of the edge of described biasing groove 30 and the second helicla flute 20 is: 90 ° of 180 ° >=α >.
In the present embodiment, the length of described the second cutting edge 120 is more than or equal to zero, and in the time that the length of the second cutting edge 120 equals zero, the second cutting edge 120 completely loses cutting function, thereby the second spiral fluted is drawn the efficiency of air and is reached high state, and radiating efficiency is better.
Embodiment bis-
As shown in Figure 6 to 7, be with the difference of embodiment mono-, the second rear knife face 122 in embodiment mono-is less than zero with the length of the intersection of boring body; Such result has caused biasing groove 30 crossing with the first chip area 10, and like this, dust exhaust apparatus is drawn the Capacity extension of air to the first helicla flute 10 regions, thereby hot-air can be gone out by absorption as soon as possible, improves radiating efficiency.
As a kind of project organization of the present embodiment, the helical angle of described biasing groove 30 is different from the second spiral fluted helical angle.This is because different process requirements, for the requirement difference of drill bit intensity, position, hole precision, therefore, the helical angle of the groove 30 of can selecting as required to setover.
Embodiment tri-
As shown in Figure 8-9, be with the difference of embodiment bis-, in the present embodiment, the first helicla flute 10 and the second helicla flute 20 are symmetrical arranged, biasing groove 30 is extended to the inside of this second helicla flute 20 by the second spiral fluted outside, the intersecting area of biasing groove 30 and the second helicla flute 20 is less than the width of this second helicla flute 20, and the degree of depth of biasing groove 30 is greater than the degree of depth of the second helicla flute 20; The air that can make dust exhaust apparatus accelerate to siphon away apex point region is set like this, further improves radiating efficiency.And the helical angle of biasing groove 30 is identical with the helical angle of the second helicla flute 20, according to the strength demand of structure that bores body, the thickness that this kind of structure can be guaranteed apex point region brill core is relatively consistent, thus its intensity of relative increase.
Embodiment tetra-
As shown in Figure 10 to 11, in the present embodiment, described the second rear knife face 122 and very little of length of intersection of boring body, close to zero, under this structure, the area space of biasing groove 30 reaches maximization, and area of dissipation and gettering efficiency can be higher.In the present embodiment, the width of described biasing groove 30 is greater than the width of described the second helicla flute 20, and covers the second helicla flute 20 regions.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (9)
1. a microbit, is characterized in that, comprising:
Be arranged on major first face, major first flank, the second rake face, the second rear knife face of apex point position;
By apex point to bore the first helicla flute that tail direction extends and with symmetrically arranged the second helicla flute of described the first helicla flute, described the first helicla flute formation first cutting edge crossing with described major first face, described the second helicla flute and crossing formation the second cutting edge of described the second rake face;
And a biasing groove that is arranged on the front end area of drill bit, this biasing groove is crossing with described the second rake face, makes the length of described the second cutting edge be less than the length of described the first cutting edge, and this biasing groove is crossing with described the second helicla flute.
2. microbit as claimed in claim 1, is characterized in that, described biasing groove is also crossing with described the second rear knife face, makes described the second rear knife face and the length of the intersection of brill body be less than the fabric width of cutter.
3. microbit as claimed in claim 2, is characterized in that, described the second rear knife face is more than or equal to zero with the length of the intersection of boring body.
4. microbit as claimed in claim 1, is characterized in that, the length of described the second cutting edge is more than or equal to zero.
5. microbit as claimed in claim 1, it is characterized in that, described biasing groove extends to this second spiral fluted inside by described the second spiral fluted outside, biasing groove and the second spiral fluted intersecting area are less than this second spiral fluted width, and the degree of depth of biasing groove is greater than the second spiral fluted degree of depth.
6. microbit as claimed in claim 1, is characterized in that, the width of described biasing groove is greater than described the second spiral fluted width, and covers the second helicla flute region.
7. microbit as claimed in claim 1, is characterized in that, the angle α at the edge of described biasing groove and described the second spiral fluted edge is: 90 ° of 180 ° >=α >.
8. microbit as claimed in claim 1, is characterized in that, the helical angle of described biasing groove is identical with described the second spiral fluted helical angle.
9. microbit as claimed in claim 1, is characterized in that, the helical angle of described biasing groove is different from described the second spiral fluted helical angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320893390.0U CN203679362U (en) | 2013-12-31 | 2013-12-31 | Minitype drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320893390.0U CN203679362U (en) | 2013-12-31 | 2013-12-31 | Minitype drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203679362U true CN203679362U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320893390.0U Withdrawn - After Issue CN203679362U (en) | 2013-12-31 | 2013-12-31 | Minitype drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203679362U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752911A (en) * | 2013-12-31 | 2014-04-30 | 深圳市金洲精工科技股份有限公司 | Miniature drill bit and machining method thereof |
-
2013
- 2013-12-31 CN CN201320893390.0U patent/CN203679362U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752911A (en) * | 2013-12-31 | 2014-04-30 | 深圳市金洲精工科技股份有限公司 | Miniature drill bit and machining method thereof |
| CN103752911B (en) * | 2013-12-31 | 2017-08-25 | 深圳市金洲精工科技股份有限公司 | A kind of microbit and its processing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140702 Effective date of abandoning: 20170825 |