CN205362790U - Drill bit structure - Google Patents

Abstract

The utility model provides a drill structure, comprising: a shank section and a blade section, the blade section is arranged at one end of the shank section, a blade face center is arranged at the front end of the blade section, two symmetrical cutting blade faces are formed obliquely backward on both sides of the blade face center, and each cutting blade face comprises: a main blade face, the main blade face comprises a cutting edge, a first connecting edge and a first cutting edge; a secondary blade face, the secondary blade face comprises a blade back edge, a second connecting edge, a second cutting edge and a secondary blade face outer edge, the second connecting edge is connected to the first connecting edge and the first cutting edge and the second cutting edge intersect; an auxiliary blade face is extended from the first cutting edge of the main blade face and the second cutting edge of the auxiliary blade face, and is inclined toward the shank section. This drill structure has the advantage of improving the quality of the hole wall.

Description

Bit structure

technical field

The utility model relates to a drill bit structure, in particular to a drill bit structure suitable for a printed circuit board (PCB).

Background technique

With the current trend of electronic products being thinner and smaller, the manufacturing and processing of various electronic components inside electronic products will become more and more refined, and the volume of printed circuit boards that can be used to set the position of electronic components must also be adjusted accordingly. zoom out. At present, the industry has higher and higher requirements for the precision, strength, feed rate, and even the processing conditions of the microdrill used in the drilling process of printed circuit boards, and even the quality of the hole wall. Moreover, in practice, the industry usually performs the same drilling process on stacked multi-piece printed circuit boards to improve processing efficiency and reduce manufacturing costs. It has sufficient strength and chip removal ability.

The traditional micro-drill mainly includes a shank section and a blade section connecting one end of the shank section, and a cutting surface structure 10 is arranged at the front end of the blade section, as shown in Figure 1, which includes two main cutting surfaces 12, 12' and two The auxiliary knife faces 14 and 14 ′ are symmetrically arranged at a static point 16 of the knife tip, and are used for chiseling the surface of the plate by using the knife face structure 10 . In such a design of the cutter face structure 10, the main cutter face 12, 12' and the auxiliary cutter face 14, 14' will have a large contact area with the plate, so that the cutter face is prone to chipping, which not only causes poor quality of the hole wall, but also Will reduce the life of the drill bit.

Utility model content

In order to solve the above problems, the purpose of this utility model is to propose a drill bit structure, through the chamfering of the cutter face to form the design of the auxiliary cutter face, which can greatly reduce the contact area between the cutter face and the plate, so that the cutter face is not easy to collapse, and Can greatly increase the quality of the hole wall.

In order to achieve the above object, the drill bit structure of an embodiment of the present invention includes a shank section; Two symmetrical cutting facets are obliquely formed on both sides of the center of the face toward the shank section, and the outer peripheries of the two cutting facets respectively extend backward along the outer peripheral surface of the blade section to form two helical side edges and two chip removal surfaces. groove, two cutting blade faces have an intersecting edge, the intersecting edge is located at the center of the blade face, each cutting blade face includes: a main blade face, the main blade face has a cutting edge, a first connecting edge and a first cutting edge, The cutting edge and the first connecting edge are respectively extended from opposite ends of the intersecting edge, and the ends of the cutting edge and the first connecting edge far away from the intersecting edge are connected to the first cutting edge; A knife back edge, a second connecting edge, a second cutting edge and an outer edge of a secondary knife surface, the second connecting edge is connected with the first connecting edge, and one end of the second cutting edge is connected with the second connecting edge and the first connecting edge of the main knife surface The other end of the cutting edge, the second cutting edge is connected to the outer edge of the auxiliary knife surface; an auxiliary knife surface, the auxiliary knife surface is extended from the first cutting edge of the main knife surface and the second cutting edge of the auxiliary knife surface, and goes to the handle The direction of the segment is inclined.

Among them, the two auxiliary cutter faces are formed by chamfering the opposite corners of the two cutting cutter faces; Between 10 degrees and 85 degrees; and each auxiliary cutter face includes an auxiliary cutting edge and a peripheral edge, and the auxiliary cutting edge is continuous with the cutting edge of the main cutter face.

Wherein, there is a first distance between the two first cutting edges of the two main blade faces, and a second distance between the two peripheral edges of the two auxiliary blade faces, the first distance is smaller than the second distance, and the first distance is the same as the second distance. The ratio of the two intervals is between 30% and 95%.

In one embodiment, the two knife backs of the two auxiliary knife faces are respectively extended from the opposite ends of the intersecting edges, and the end of the knife back edge away from the center of the knife face is connected to the outer edge of the auxiliary knife face; and each main knife face The area gradually widens from the center of the knife face to the outer periphery.

In one embodiment, a part of the cutting edge of the main face of each cutting face adjacent to the center of the face and a part of the back edge of the secondary face of the other cutting face adjacent to the center of the face jointly form a main groove. The groove extends to the wall surface of each chip removal groove, and the middle section of each cutting edge forms a primary groove.

In one embodiment, the intersecting edges of the two cutting facets are formed by a first edge of the main facet of one cutting facet and a second edge of the secondary facet of the other cutting facet.

In one embodiment, the two main cutter faces are located on both sides of the center of the cutter face, and a drill point angle is constructed, and the drill point angle is between 120 degrees and 185 degrees.

In one embodiment, the outer diameter of the shank segment is between 3.17 mm and 3.18 mm, and the outer diameter of the blade segment is between 0.075 mm and 3.175 mm, or between 3.175 mm and 6.5 mm.

The advantage of the drill bit structure of the present utility model is that the design of forming the auxiliary cutter surface by chamfering the cutter face can greatly reduce the contact area between the cutter face and the plate, so that the cutter face is not easy to collapse, and the quality of the hole wall can be greatly increased; Or, through the continuation of the auxiliary cutting edge of the auxiliary cutter face and the cutting edge of the main cutter face, the cutting line of the main cutter face can be increased, so that the cutting ability during drilling is enhanced, and the quality of the hole wall can be improved.

In the following, detailed explanations will be made through specific embodiments in conjunction with the accompanying drawings, so that it will be easier to understand the purpose, technical content, characteristics and effects of the present utility model.

Description of drawings

The following drawings are only intended to illustrate and explain the utility model schematically, and do not limit the scope of the utility model. in:

FIG. 1 is a schematic diagram of a cutter face structure of a traditional drill bit structure.

Fig. 2 is a structural schematic diagram of a drill bit structure according to an embodiment of the present invention.

Fig. 3 is a top view of the end surface of the drill bit structure of the first embodiment of the utility model.

Fig. 4 is a top view of the end surface of the drill bit structure of the second embodiment of the utility model.

Fig. 5 is a top view of the end face of the drill bit structure of the third embodiment of the present invention.

Fig. 6 is a top view of the end surface of the drill bit structure of the fourth embodiment of the utility model.

Explanation of main component labels:

10 blade structure

12, 12' main cutter face

14, 14' side blade

16 knife tip static point

20 bit structure

22 handle section

24 blade section

26 facet centers

28, 28' cutting face

30, 30' spiral side edge

32, 32' chip groove

34, 34' main cutter face

341, 341' cutting edge

342 first connecting side

343, 343' the first trimming edge

344, 344' first edge

36, 36' side blade

361, 361' knife back edge

362 second connecting edge

363 second trimming

364 side blade outer edge

365, 365' second edge

38, 38' auxiliary knife surface

381 auxiliary cutting edge

382, 382' peripheral edge

tthickness

40, 40' main groove

42, 42' sub-groove

w1 first pitch

w2 second spacing

θ1 drill tip angle

θ2 included angle

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings.

Figure 2 is a structural schematic diagram of a drill bit structure according to an embodiment of the present invention. As shown in Figure 2, a drill bit structure 20 includes a shank section 22 and a blade section 24, and the blade section 24 is arranged on the shank section 22 One end of the blade section 24 is provided with a knife face center 26 at the front end of the blade section 24, and two corresponding cutting knife faces 28, 28' are formed obliquely on both sides of the knife face center 26 toward the handle section 22 (or backward). The outer peripheries of the knife faces 28, 28' respectively extend backward along the outer peripheral surface of the blade section 24 to form two helical side edges 30, 30' and two chip removal grooves 32, 32', please refer to Fig. 3 for this practical The top view of the end face of the drill bit structure of the first embodiment of the new model, the two cutting facets 28, 28' have an intersecting edge located at the center 26 of the cutting facets, as shown in Figure 3, each cutting facet 28, 28' includes a main cutting facet 34, 34', a secondary blade surface 36, 36' and an auxiliary blade surface 38, 38'.

Below, mainly take the main cutter face 34, the auxiliary cutter face 36 and the auxiliary cutter face 38 of the cutting cutter face 28 as an example to illustrate the features of the present utility model. The knife surface 38' also has corresponding features. The main cutter face 34 includes a cutting edge 341, a first connecting edge 342 and a first cutting edge 343, and the cutting edge 341 and the first connecting edge 342 are formed by the center of the cutter face 26 (that is, the two cutting edges 28, 28' respectively). The opposite ends of the intersecting edge) are extended, and the other end of the cutting edge 341 and the first connecting edge 342 away from the center 26 of the blade face is connected to the first cutting edge 343. In one embodiment, the cutting edge 341 and the first connecting edge 342 The connecting sides 342 are opposite and parallel. The auxiliary blade surface 36 comprises a knife back edge 361, a second connecting edge 362, a second trimming edge 363 and a secondary knife surface outer edge 364, the second connecting edge 362 is parallel to the first connecting edge 342, and the two auxiliary blades The two knife backs 361, 361' of the surfaces 36, 36' are respectively extended from the opposite ends of the center 26 of the knife face, and one end of the second trimming edge 363 is connected to the second connecting edge 362 and connected to the first trimming edge 343 of the main knife face 34. The other end of the second trimming edge 363 is connected to one end of the outer edge 364 of the secondary blade face, and the other end of the outer edge 364 of the minor blade face is connected to the end of the back edge 361 away from the center 26 of the blade face. The auxiliary cutter surface 38 extends from the first cutting edge 343 of the main cutter surface 34 and the second cutting edge 363 of the auxiliary cutter surface 36, and is inclined toward the handle section 22 (shown in FIG. 2 ). The cutter face 38 includes an auxiliary cutting edge 381 and a peripheral edge 382 , wherein the auxiliary cutting edge 381 is continuous with the cutting edge 341 of the main cutter face 34 .

Fig. 4 shows the top view of the end surface of the drill bit structure of the second embodiment of the utility model. As shown in Fig. 4, two corresponding holes are formed obliquely toward the handle section 22 (shown in Fig. 2) on both sides of the center of the cutter face 26. Cutting blade surfaces 28, 28', each cutting blade surface 28, 28' includes a main blade surface 34, 34', a secondary blade surface 36, 36' and an auxiliary blade surface 38, 38', the second embodiment and the first The main difference of the first embodiment is that in the second embodiment, the area of each main blade face 34, 34' gradually widens from the center 26 of the blade face to the outer peripheral direction, so as to have a slightly fan-shaped design, that is, compared with the first embodiment For the cutting face 28, 28' shown, the cutting face 28, 28' shown in the second embodiment has a small thickness t of the center 26 of the cutting face, so that the drill-down resistance can be reduced when drilling, and the cutting edge can be increased. The service life of section 24 (shown in FIG. 2 ).

Fig. 5 shows the top view of the end surface of the drill bit structure according to the third embodiment of the utility model. As shown in Fig. 5, two corresponding holes are obliquely formed on both sides of the cutter face center 26 toward the handle section 22 (shown in Fig. 2). Cutting facets 28, 28, each cutting facet 28, 28 includes a main facet 34, 34', a secondary facet 36, 36' and an auxiliary facet 38, 38', wherein the adjacent facets of the main facet 34 Part of the cutting edge 341 of the center 26 and a part of the back edge 361' of the secondary cutter face 36' adjacent to the center 26 of the cutter face jointly form a main groove 40 extending to the wall surface of the chip removal groove 32. Correspondingly, the adjacent cutter face 34' Part of the cutting edge 341' at the center of the cutter face 26 and a part of the back edge 361 of the adjacent cutter face center 26 of the minor cutter face 36 jointly form a main groove 40' extending to the wall surface of the chip removal groove 32'; The middle sections of 341, 341' form primary grooves 42, 42' respectively. This design of forming main grooves 40, 40' and secondary grooves 42, 42' on the cutting blade surface can cut through discontinuous straight lines. The wire breaks down the chips in order to prevent the chips from rolling up in lumps on the end of the blade segment, thereby improving the drilling quality of this drill bit structure.

Fig. 6 shows the top view of the end surface of the drill bit structure of the fourth embodiment of the utility model. As shown in Fig. 6, two corresponding holes are formed obliquely toward the handle section 22 (shown in Fig. 2) on both sides of the center of the cutter face 26. Cutting face 28, 28', each cutting face 28, 28' includes a main face 34, 34', a secondary face 36, 36' and an auxiliary face 38, 38', the fourth embodiment and the first The main difference of one embodiment is that in the fourth embodiment, the center 26 of the blade face is formed by a first edge 344, 344' of each main blade face 34, 34' and a first edge 344, 344' of each secondary blade face 36, 36'. The two edges 365, 365' are connected to each other.

In the above-mentioned first, second, third and fourth embodiments, the two auxiliary cutter faces 38, 38' are formed by chamfering at opposite corners of the two cutting cutter faces 28, 28', so that the main cutter face The intersections of 34, 34' and the auxiliary cutter surfaces 36, 36' form auxiliary cutter surfaces 38, 38'. Taking the cutting blade faces 28, 28' of the first embodiment shown in Fig. 3 as an example, there is a first distance w1 between the two first cutting edges 343, 343' of the two main blade faces 34, 34', and the two auxiliary blades There is a second distance w2 between the two peripheral edges 382, 382' of the surfaces 38, 38', the first distance w1 is smaller than the second distance w2, and the ratio of the first distance w1 to the second distance w2 is between 30% and 95%, wherein the ratio of the first distance w1 to the second distance w2 is preferably 90%.

Please refer to Fig. 2 again, the two cutting facets 28, 28' are located on both sides of the center of the facet 26, and a drill point angle θ1 is constructed between 120 degrees and 185 degrees, and the auxiliary cutting facets 38, 38' are in the cutting The blade surfaces 28, 28' are formed by chamfering. The auxiliary blade surfaces 38, 38' are inclined toward the shank section 22 and have an included angle θ2 with a central axis of the blade section 24. The included angle θ2 is between Between 10 degrees and 85 degrees. Wherein, the outer diameter of the shank section 22 is between 3.17 mm and 3.18 mm, and the outer diameter of the blade section 24 is between 0.075 mm and 3.175 mm, or between 3.175 mm and 6.5 mm.

In the utility model, the chamfering of the cutting blade surface to form the auxiliary blade surface can greatly reduce the contact area between the cutting blade surface and the plate, so that the blade surface is not easy to be damaged, and the quality of the hole wall can be greatly increased; moreover, through the auxiliary The connection between the auxiliary cutting edge of the cutter face and the cutting edge of the main cutter face can increase the cutting line of the main cutter face, enhance the cutting ability during drilling, and improve the quality of the hole wall.

The above descriptions are only illustrative specific implementations of the present utility model, and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present utility model shall fall within the protection scope of the present utility model. And it should be noted that each component of the utility model is not limited to the above-mentioned overall application, and each technical feature described in the specification of the utility model can be selected to be used alone or in combination according to actual needs. Therefore, The utility model naturally covers other combinations and specific applications related to the invention point of the case.

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.