CN205362790U - Drill structure - Google Patents

Abstract

The utility model provides a drill structure contains: a stalk portion section and a cutting part section, cutting part section set up in the one end of stalk portion section, and the knife face center of setting up foremost of cutting part section, knife face center both sides slant backward are formed with the cutting knife face of bisymmetry, and each cutting knife face contains: an operator face, operator bread contains all edgings, a first connection limit and a first side cut, a pair knife face, vice knife face contain a back of a knife blade limit, limit, second side cut and a pair knife face outer fringe are connected to a second, and the second is connected the limit and is connected the limit and connects and first side cut and second side cut handing -over with first, an assistance knife face prolongs the second side cut that the first side cut of locating the operator face reached vice knife face, and inclines toward stalk portion section direction. This drill structure has the advantage that promotes the pore wall quality.

Description

Drill bit structure

Technical field

This utility model relates to a kind of drill bit structure, is applicable to the drill bit structure of printed circuit board (PCB) (printedcircuitboard, PCB) in particular to one.

Background technology

Being under compact designer trends at electronic product now, the manufacture of the various electronic components within electronic product processing will become to get over fine, and the volume for being available for the printed circuit board (PCB) of electric component group setting position also must reduce therewith.The precision of microbit (microdrill), intensity and the feed rate that current industry uses for printed circuit board drilling procedure for processing, or even the requirement of the processing conditions such as hole wall quality is also more and more higher.And; in practice, stacked multi-disc printed circuit board (PCB) would generally be carried out identical Drilling operation technique by industry in the lump, to promote working (machining) efficiency and to reduce manufacturing cost; therefore the length of the bit used is longer, it is also necessary to have enough intensity and chip removal ability.

Tradition microbit mainly comprises a shank section and one end of a blade section connection handle section, blade section a knife face structure 10 is set foremost, as shown in Figure 1, it comprises the secondary knife face 14,14 ' in two operator faces 12,12 ' and two and is symmetricly set in a point of a knife dead point 16, cuts in order to utilize knife face structure 10 that the surface of sheet material is carried out cutter.In the knife face structure 10 of this kind of design, operator face 12,12 ' and secondary knife face 14,14 ' can because of bigger with web contact area so that knife face easily collapses scarce, not only causes wall quality not good, also can reduce drilling life of bit.

Utility model content

In order to solve the problems referred to above, the purpose of this utility model is to propose a kind of drill bit structure, by cutting edge surface chamfer to constitute the design of auxiliary knife face, the contact area of cutting knife face and sheet material can be greatly reduced so that knife face not easily collapses scarce, and wall quality can be significantly increased.

In order to achieve the above object, the drill bit structure of this utility model one embodiment comprises a shank section；And a blade section, this blade section is arranged at one end of shank section, blade section a knife face center is set foremost, both sides, knife face center are towards the oblique cutting knife face being formed with two symmetries in this shank section direction, the neighboring of two cutting knife faces extends back respectively along the outer peripheral face of blade section and curls up to form two spiral side edges and two chip removal flutes, two cutting edge masks have one to intersect seamed edge, crossing seamed edge is positioned at knife face center, each cutting edge bread containing: one operator face, operator mask has a cutting edge, one first connects limit and one first trimming, it is extended that cutting edge and first connects limit opposite end by crossing seamed edge respectively, and cutting edge and first one end away from crossing seamed edge connecting limit are connected with the first trimming；One secondary knife face, secondary knife face comprises a knife back limit, one second connection limit, one second trimming and a secondary knife face outer rim, second connects limit is connected limit connection with first, and one end of the second trimming connects the second connection limit and first trimming in operator face, the other end auxiliary connection knife face outer rim of the second trimming；One auxiliary knife face, auxiliary knife face is located at first trimming in operator face and the second trimming of secondary knife face, and tilts toward shank section direction.

Wherein, two auxiliary knife faces are to carry out chamfering in two relative two corners cutting knife face to be constituted；Auxiliary knife face is toward the inclination of shank section direction and has an angle between a central shaft of blade section, and angle is between 10 degree and 85 degree；Each auxiliary knife face comprises an assisted machining limit and a peripheral edge again, and continues the cutting edge in operator face in assisted machining limit.

Wherein, having one first spacing, have one second spacing between two peripheral edge of two auxiliary knife faces between two first trimmings in two operator faces, first is smaller than the second spacing, and the ratio of the first spacing and the second spacing is between 30% and 95%.

In an embodiment, two knife back limits of two secondary knife faces opposite end by crossing seamed edge respectively is extended, and the one end away from knife face center on knife back limit is connected with pair knife face outer rim；The region in each operator face is widened gradually by knife face center peripheral direction outward again.

In an embodiment, the part at contiguous knife face center is collectively forming a main groove to the part at the contiguous knife face center of cutting edge in the operator face of each cutting knife face with the knife back limit of the secondary knife face of another cutting knife face, main groove extends to the wall of each chip removal flute, and the center section part of each cutting edge forms a groove.

In an embodiment, the crossing seamed edges of two cutting knife faces are to be continued by one second seamed edge of operator one first seamed edge in face cutting knife face and the secondary knife face of another cutting knife face to be constituted.

In an embodiment, two operator faces are positioned at both sides, knife face center and construction one bit tip angle, and bit tip angle is between 120 degree and 185 degree.

In an embodiment, the external diameter of shank section is between 3.17 millimeters and 3.18 millimeters, and the external diameter of blade section is between 0.075 millimeter and 3.175 millimeters, or between 3.175 millimeters and 6.5 millimeters.

The advantage of drill bit structure of the present utility model is, the contact area of cutting knife face and sheet material can be greatly reduced with the design constituting auxiliary knife face by cutting edge surface chamfer so that knife face not easily collapses scarce, and hole wall quality can be significantly increased；Furthermore, by continuing of the cutting edge in the assisted machining limit of auxiliary knife face and operator face, the line of cut in operator face can be increased so that during boring, cutting power strengthens, and can promote hole wall quality.

Appended accompanying drawing elaborate is coordinated, when being easier to understand the purpose of this utility model, technology contents, feature and the effect reached thereof below by way of specific embodiment.

Accompanying drawing explanation

The following drawings is only intended to, in this utility model being schematically illustrated and explaining, not limit scope of the present utility model.Wherein:

Fig. 1 show the knife face structural representation of traditional a kind of drill bit structure.

Fig. 2 show the structural representation of this utility model one embodiment drill bit structure.

Fig. 3 show the end face top view of this utility model one first embodiment drill bit structure.

Fig. 4 show the end face top view of this utility model one second embodiment drill bit structure.

Fig. 5 show the end face top view of this utility model 1 the 3rd embodiment drill bit structure.

Fig. 6 show the end face top view of this utility model 1 the 4th embodiment drill bit structure.

Main element label declaration:

10 knife face structures

12,12 ' operator face

14,14 ' secondary knife face

16 point of a knife dead points

20 drill bit structures

22 shank sections

24 blade sections

26 knife face centers

28,28 ' cutting knife face

30,30 ' spiral side edge

32,32 ' chip removal flute

34,34 ' operator face

341,341 ' cutting edge

342 first connect limit

343,343 ' first trimming

344,344 ' first seamed edge

36,36 ' secondary knife face

361,361 ' knife back limit

362 second connect limit

363 second trimmings

364 secondary knife face outer rims

365,365 ' second seamed edge

38,38 ' auxiliary knife face

381 assisted machining limits

382,382 ' peripheral edge

T thickness

40,40 ' main groove

42,42 ' secondary groove

W1 the first spacing

W2 the second spacing

θ 1 bit tip angle

θ 2 angle

Detailed description of the invention

In order to technical characteristic of the present utility model, purpose and effect are more clearly understood from, now comparison accompanying drawing illustrates detailed description of the invention of the present utility model.

nullFig. 2 show the structural representation of this utility model one embodiment drill bit structure，As shown in Figure 2，One drill bit structure 20 comprises shank section 22 and a blade section 24，Blade section 24 is arranged at one end of shank section 22，Blade section 24 a knife face center 26 is set foremost，Both sides, knife face center 26 are towards shank section 22 direction (or backward) the oblique cutting knife face 28 being formed with two correspondences、28’，Two cutting knife faces 28、The neighboring of 28 ' extends back respectively along the outer peripheral face of blade section 24 and curls up to form two spiral side edges 30、30 ' and two chip removal flutes 32、32’，Please refer to the end face top view that Fig. 3 is this utility model one first embodiment drill bit structure，Two cutting knife faces 28、28 ' have a crossing seamed edge is positioned at knife face center 26，As shown in Figure 3，Each cutting knife face 28、28 ' comprise an operator face 34、34’、One secondary knife face 36、36 ' and an auxiliary knife face 38、38’.

Under main for the operator face 34 cut knife face 28, secondary knife face 36 and auxiliary knife face 38 feature of the present utility model is described, another cuts the operator face 34 ' of knife face 28 ', pair knife face 36 ' and auxiliary knife face 38 ' and also has corresponding feature.Operator face 34 comprises a cutting edge 341,1 first and connects limit 342 and one first trimming 343, it is extended that cutting edge 341 and first connects limit 342 opposite end by knife face center 26 (that is crossing seamed edge of two cutting knife faces 28,28 ') respectively, and the other end away from knife face center 26 and first trimming 343 on cutting edge 341 and the first connection limit 342 connect, in an embodiment, cutting edge 341 and the first connection limit 342 are relative and parallel.Secondary knife face 36 comprises a knife back limit 361,1 second and connects limit 362,1 second trimming 363 and a secondary knife face outer rim 364, second connects limit 362 is connected limit 342 with first and connects, and two two knife back limits 361, the 361 ' opposite end by knife face center 26 respectively of secondary knife face 36,36 ' extended, one end of second trimming 363 connects the second connection limit 362 and the first trimming 343 with operator face 34 is intersected, one end of the other end auxiliary connection knife face outer rim 364 of the second trimming 363, and the other end of secondary knife face outer rim 364 connects the one end away from knife face center 26 on knife back limit 361.Auxiliary knife face 38 is located at first trimming 343 in operator face 34 and the second trimming 363 of secondary knife face 36, and tilt toward shank section 22 (being shown in Fig. 2) direction, in an embodiment, auxiliary knife face 38 comprises assisted machining limit 381 and a peripheral edge 382, and wherein continue the cutting edge 341 in operator face 34 on assisted machining limit 381.

nullFig. 4 show the end face top view of this utility model one second embodiment drill bit structure，As shown in Figure 4，Both sides, knife face center 26 are the oblique cutting knife face 28 being formed with two correspondences towards shank section 22 (being shown in Fig. 2) direction、28’，Each cutting knife face 28、28 ' comprise an operator face 34、34’、One secondary knife face 36、36 ' and an auxiliary knife face 38、38’，The Main Differences of the second embodiment and first embodiment is in that in the second embodiment，Each operator face 34、The region of 34 ' is widened gradually by knife face center 26 peripheral direction outward，With slightly in sector design，That is compared to the cutting knife face 28 shown in first embodiment、28 '，Cutting knife face 28 shown in second embodiment、28 ' is little due to the thickness t at knife face center 26，Make to bore resistance under reducing when holing，And increase the service life of blade section 24 (being shown in Fig. 2).

nullFig. 5 show the end face top view of this utility model 1 the 3rd embodiment drill bit structure，As shown in Figure 5，Both sides, knife face center 26 are the oblique cutting knife face 28 being formed with two correspondences towards shank section 22 (being shown in Fig. 2) direction、28，Each cutting knife face 28、28 comprise an operator face 34、34’、One secondary knife face 36、36 ' and an auxiliary knife face 38、38’，The part cutting edge 341 at contiguous knife face center 26 in face 34 of wherein operating is collectively forming a main groove 40 with the part knife back limit 361 ' at the contiguous knife face center 26 of pair knife face 36 ' and extends to the wall of chip removal flute 32，Accordingly，The part knife back limit 361 at the part cutting edge 341 ' at the contiguous knife face center 26 in operator face 34 ' and the contiguous knife face center 26 of secondary knife face 36 is collectively forming a main groove 40 ' and extends to the wall of chip removal flute 32 '；A groove 42,42 ' is formed respectively again at the center section part of each cutting edge 341,341 ', this kind forms main groove 40,40 ' and the design of secondary groove 42,42 ' on cutting knife face, can be comminuted by chip by the line of cut of discontinuous straight line, to avoid chip to become bulk to roll up on the end of blade section, and then improve the boring quality of this drill bit structure.

Fig. 6 show the end face top view of this utility model 1 the 4th embodiment drill bit structure, as shown in Figure 6, both sides, knife face center 26 are the oblique cutting knife face 28 being formed with two correspondences towards shank section 22 (being shown in Fig. 2) direction, 28 ', each cutting knife face 28, 28 ' comprise an operator face 34, 34 ', one secondary knife face 36, 36 ' and an auxiliary knife face 38, 38 ', the Main Differences of the 4th embodiment and first embodiment is in that in the 4th embodiment, knife face center 26 is by each operator face 34, one first seamed edge 344 of 34 ', 344 ' and each secondary knife face 36, one second seamed edge 365 of 36 ', 365 ' continue is constituted.

In above-mentioned first, second, third and the 4th in embodiment, two auxiliary knife faces 38,38 ' are to carry out chamfer angle technique in two relative two corners cutting knife face 28,28 ' to be constituted, and form auxiliary knife face 38,38 ' with the junction in operator face 34,34 ' and secondary knife face 36,36 '.Cutting knife face 28,28 ' for the first embodiment shown in Fig. 3, between two first trimmings 343,343 ' in two operator faces 34,34 ', there is one first spacing w1, between two peripheral edge 382,382 ' of two auxiliary knife faces 38,38 ', there is one second spacing w2, first spacing w1 is less than the second spacing w2, and first the ratio of spacing w1 and the second spacing w2 between 30% and 95%, wherein the ratio of the first spacing w1 and the second spacing w2 is preferably 90%.

Referring to Fig. 2, two cutting knife faces 28,28 ' are positioned at both sides, knife face center 26, and construction one bit tip angle θ 1 is between 120 degree and 185 degree, auxiliary knife face 38,38 ' is to carry out chamfering in cutting knife face 28,28 ' to be constituted again, auxiliary knife face 38,38 ' toward shank section 22 direction tilt and and a central shaft of this blade section 24 between there is an angle theta 2, angle theta 2 is between 10 degree and 85 degree.Wherein, the external diameter of shank section 22 is between 3.17 millimeters and 3.18 millimeters, and the external diameter of blade section 24 is between 0.075 millimeter and 3.175 millimeters, or between 3.175 millimeters and 6.5 millimeters.

In this utility model, the contact area of cutting knife face and sheet material can be greatly reduced with the design constituting auxiliary knife face by cutting edge surface chamfer so that knife face not easily collapses scarce, and wall quality can be significantly increased；Furthermore, by continuing of the cutting edge in the assisted machining limit of auxiliary knife face and operator face, the line of cut in operator face can be increased so that during boring, cutting power strengthens, and can promote wall quality.

The foregoing is only the schematic detailed description of the invention of this utility model, be not limited to scope of the present utility model.Any those skilled in the art, the equivalent variations made under the premise without departing from design of the present utility model and principle and amendment, all should belong to the scope of this utility model protection.And it should be noted that, each ingredient of the present utility model is not limited in above-mentioned overall applicability, each technical characteristic described in description of the present utility model can select an independent employing according to actual needs or select the multinomial use that combines, therefore, this utility model covers other combination relevant with this case inventive point in the nature of things and specifically applies.

Claims (10)

1. a drill bit structure, it is characterised in that described drill bit structure comprises:

One shank section；And

One blade section, it is arranged at one end of this shank section, this blade section a knife face center is set foremost, these both sides, knife face center are towards the oblique cutting knife face being formed with two symmetries in this shank section direction, the neighboring of two these cutting knife faces extends back respectively along the outer peripheral face of this blade section and curls up to form two spiral side edges and two chip removal flutes, two these cutting edge masks have one intersect seamed edge, this crossing seamed edge is positioned at this knife face center, this cutting edge bread each containing:

One operator face, comprise a cutting edge, one first connection limit and one first trimming, this cutting edge and this first to connect limit opposite end by this crossing seamed edge respectively extended, and this cutting edge and this first one end away from this crossing seamed edge connecting limit are connected with this first trimming；

One secondary knife face, comprise a knife back limit, one second connection limit, one second trimming and a secondary knife face outer rim, this second connect limit with this first be connected limit connection, one end of this second trimming connects this first trimming in this second connection limit and this operator face, and the other end of this second trimming connects this pair knife face outer rim；And

One auxiliary knife face, is located at this first trimming in this operator face and this second trimming of this pair knife face, and tilts toward this shank section direction.

2. drill bit structure as claimed in claim 1, it is characterised in that this auxiliary knife face comprises an assisted machining limit and a peripheral edge, continue this cutting edge in this operator face on this assisted machining limit.

3. drill bit structure as claimed in claim 2, it is characterized in that, between this first trimming of the two of two these operator faces, there is one first spacing, between two these peripheral edge of two these auxiliary knife faces, there is one second spacing, this first is smaller than this second spacing, and the ratio of this first spacing and this second spacing is between 30% and 95%.

4. drill bit structure as claimed in claim 1, it is characterised in that this knife back limit of the two of two these pair knife faces opposite end by this knife face center respectively is extended, and the one end away from this knife face center on this knife back limit is connected with this pair knife face outer rim.

5. drill bit structure as claimed in claim 4, it is characterised in that the region in this operator face each is widened from this knife face center gradually toward this direction, neighboring.

6. drill bit structure as claimed in claim 4, it is characterized in that, the part at this knife face center contiguous is collectively forming a main groove to the part at this cutting edge of this cutting knife face each this knife face center contiguous with this knife back limit of another this cutting knife face, this main groove extends to the wall of this chip removal flute each, and the center section part of this cutting edge each forms a groove.

7. drill bit structure as claimed in claim 1, it is characterised in that this crossing seamed edge is that one second seamed edge of this pair knife face of one first seamed edge in this operator face by this cutting knife face and another this cutting knife face continues and constituted.

8. drill bit structure as claimed in claim 1, it is characterized in that, between this auxiliary knife face and central shaft for this blade section that this shank section direction tilts, there is an angle, and this angle is between 10 degree and 85 degree, two these operator faces are positioned at this both sides, knife face center, and construction one bit tip angle, this bit tip angle is between 120 degree and 185 degree.

9. drill bit structure as claimed in claim 1, it is characterised in that two these auxiliary knife faces are to carry out chamfering in relative two corners of two these cutting knife faces to be constituted.

10. drill bit structure as claimed in claim 1, it is characterised in that the external diameter of this shank section is between 3.17 millimeters and 3.18 millimeters, and the external diameter of this blade section is between 0.075 millimeter and 3.175 millimeters, or between 3.175 millimeters and 6.5 millimeters.