CN106994526B

CN106994526B - Drill bit structure

Info

Publication number: CN106994526B
Application number: CN201610044250.4A
Authority: CN
Inventors: 简松豪; 赵莉怡; 林凤钰; 赵铭元; 陈俊佑
Original assignee: TCT GLOBAL Ltd
Current assignee: TCT GLOBAL Ltd
Priority date: 2016-01-22
Filing date: 2016-01-22
Publication date: 2020-05-01
Anticipated expiration: 2036-01-22
Also published as: CN106994526A

Abstract

The present invention provides a drill bit structure, comprising: a stalk portion section and a cutting part section, the cutting part section sets up in the one end of stalk portion section, and the foremost end of cutting part section sets up a knife face center, and knife face center both sides slant backward is formed with the cutting knife face of bisymmetry, and each cutting knife face contains: a main knife face, wherein the main knife face comprises a cutting edge, a first connecting edge and a first cutting edge; the auxiliary tool face comprises a tool back edge, a second connecting edge, a second cutting edge and an auxiliary tool face outer edge, and the second connecting edge is connected with the first connecting edge in parallel and the first cutting edge is connected with the second cutting edge in an intersecting mode; an auxiliary tool face extends to the first cutting edge of the main tool face and the second cutting edge of the auxiliary tool face and inclines towards the handle section. The drill structure has the advantage of improving the quality of the hole wall.

Description

Drill bit structure

Technical Field

The present invention relates to a drill structure, and more particularly, to a drill structure suitable for a Printed Circuit Board (PCB).

Background

Under the trend of light, thin and small electronic products, the manufacturing process of various electronic components inside the electronic products becomes more and more delicate, and the volume of the printed circuit board for assembling and positioning the electronic components must be reduced. At present, the industry has increasingly high requirements on the precision, strength and feed rate of micro drills (micro drill) used in the drilling process of printed circuit boards, and even on the processing conditions such as hole wall quality. In addition, in practice, the same drilling process is usually performed on a plurality of stacked printed circuit boards to improve the processing efficiency and reduce the manufacturing cost, so that the drill used has a long length and must have sufficient strength and chip removal capability.

The conventional micro drill mainly comprises a shank section and a blade section connected to one end of the shank section, wherein a cutting face structure 10 is disposed at the most front end of the blade section, as shown in fig. 1, and comprises two major tool faces 12, 12 'and two minor tool faces 14, 14' symmetrically disposed at a tool tip dead point 16 for chiseling the surface of a plate by using the cutting face structure 10. In the designed tool face structure 10, the major tool faces 12 and 12 'and the minor tool faces 14 and 14' have a large contact area with the plate, so that the tool faces are easily broken, the quality of the hole wall is poor, and the service life of the drill bit is also reduced.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a drill structure, in which the design of forming an auxiliary cutting surface by chamfering a cutting tool surface can greatly reduce the contact area between the cutting tool surface and a plate, so that the tool surface is not easily broken, and the quality of a hole wall can be greatly increased.

To achieve the above objects, a drill structure according to an embodiment of the present invention comprises a shank section; and a blade section, this blade section sets up in the one end of stalk section, and the foremost end of blade section sets up a blade center, and the cutting knife face of bisymmetry is formed with to this stalk section direction slant in the central both sides of knife face, and the external periphery of two cutting knife faces extends the spiral respectively along the outer peripheral face of blade section backward in order to form two spiral side blades and two rows of bits ditches, and two cutting knife faces have an intersection edge, and the intersection edge is located the knife face center, and each cutting knife face contains: the main cutter face is provided with a cutting edge, a first connecting edge and a first trimming edge, the cutting edge and the first connecting edge are respectively extended from two opposite ends of the crossed edge, and one ends of the cutting edge and the first connecting edge, which are far away from the crossed edge, are connected with the first trimming edge; the auxiliary cutter face comprises a cutter back edge, a second connecting edge, a second cutting edge and an auxiliary cutter face outer edge, the second connecting edge is connected with the first connecting edge, one end of the second cutting edge is connected with the second connecting edge and the first cutting edge of the main cutter face, and the other end of the second cutting edge is connected with the auxiliary cutter face outer edge; and the auxiliary knife face extends to the first cutting edge of the main knife face and the second cutting edge of the auxiliary knife face and inclines towards the handle section.

Wherein, the two auxiliary tool faces are formed by chamfering two opposite corners of the two cutting tool faces; the auxiliary cutter face inclines towards the handle section and forms an included angle with a central axis of the blade section, and the included angle is between 10 degrees and 85 degrees; each auxiliary cutting face comprises an auxiliary cutting edge and a peripheral edge, and the auxiliary cutting edge is connected with the cutting edge of the main cutting face.

The first distance is formed between the two first cut edges of the two main cutter surfaces, the second distance is formed between the two peripheral edges of the two auxiliary cutter surfaces, the first distance is smaller than the second distance, and the ratio of the first distance to the second distance is between 30% and 95%.

In one embodiment, the two knife back edges of the two secondary knife surfaces are respectively extended from two opposite ends of the intersecting edge, and one end of the knife back edge far away from the intersecting edge is connected with the outer edge of the secondary knife surface; the area of each main knife surface is gradually widened from the center of the knife surface to the outer peripheral direction.

In one embodiment, a portion of the cutting edge of each major blade surface adjacent to the center of the blade surface and a portion of the back edge of each minor blade surface adjacent to the center of the blade surface form a major groove, the major groove extends to the wall surface of each chip removal groove, and the middle section of each cutting edge forms a minor groove.

In one embodiment, the intersecting edges of the two cutting tool faces are formed by a continuation of a first edge of each major tool face and a second edge of each minor tool face.

In one embodiment, the two major rake faces are located on either side of the center of the rake face and establish a tip angle between 120 and 185 degrees.

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

The drill bit structure has the advantages that the design of forming the auxiliary cutter face by chamfering the cutting cutter face can greatly reduce the contact area between the cutting cutter face and a plate, so that the cutter face is not easy to break, and the quality of a hole wall can be greatly improved; moreover, through the connection of the auxiliary cutting edge of the auxiliary tool face and the cutting edge of the main tool face, the cutting line of the main tool face can be increased, so that the cutting capability during drilling is enhanced, and the quality of the hole wall can be improved.

The purpose, technical content, features and effects of the present invention will be more readily understood by the following detailed description of the specific embodiments in conjunction with the accompanying drawings.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

fig. 1 is a schematic view showing a blade structure of a conventional drill.

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

FIG. 3 is a top view of the face of a first embodiment of the drill bit configuration of the present invention.

FIG. 4 is a top view of the end face of a second embodiment of the drill bit configuration of the present invention.

FIG. 5 is a top view of the face of a third embodiment of the drill bit configuration of the present invention.

FIG. 6 is a top view of the end face of a fourth embodiment of the drill bit configuration of the present invention.

Main element number description:

10 knife face structure

12. 12' main knife surface

14. 14' subsidiary cutting surface

16 nose quiescent point

20 drill bit structure

22 shank segment

24 blade section

26 center of blade face

28. 28' cutting blade face

30. 30' spiral side edge

32. 32' chip removal ditch

34. 34' main blade surface

341. 341' cutting edge

342 first connecting edge

343. 343' first cut edge

344. 344' first edge

36. 36' auxiliary knife surface

361. 361' knife back edge

362 second connecting edge

363 second cut edge

364 minor blade outer edge

365. 365' second edge

38. 38' subsidiary knife surface

381 auxiliary cutting edge

382. 382' peripheral edge

t thickness

40. 40' main groove

42. 42' minor groove

w1 first pitch

w2 second pitch

Angle of theta 1 point

Angle theta 2

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a drill structure according to an embodiment of the present invention, and as shown in fig. 2, a drill structure 20 includes a shank section 22 and a blade section 24, the blade section 24 is disposed at one end of the shank section 22, a cutting face center 26 is disposed at the foremost end of the blade section 24, two corresponding cutting faces 28, 28 ' are obliquely formed on two sides of the cutting face center 26 toward the shank section 22 (or rearward), outer peripheries of the two cutting faces 28, 28 ' respectively extend rearward along an outer peripheral surface of the blade section 24 to form two spiral side edges 30, 30 ' and two chip removal grooves 32, 32 ', please refer to fig. 3 which is a top view of an end face of a drill structure according to a first embodiment of the present invention, the two cutting faces 28, 28 ' have an intersecting edge located at the cutting face center 26, as shown in fig. 3, each cutting face 28, 28 ' includes a main face 34, 34 ', a sub-face 36, 36 'and a

rake surface

38, 38'.

The features of the present invention will be mainly described below by taking the main rake face 34, the sub rake face 36 and the sub rake face 38 of the cutting rake face 28 as an example, and the main rake face 34 ', the sub rake face 36' and the sub rake face 38 'of the other cutting rake face 28' also have corresponding features. The major cutting surface 34 includes a cutting edge 341, a first connecting edge 342 and a first cutting edge 343, the cutting edge 341 and the first connecting edge 342 extend from two opposite ends of the center 26 (i.e. the intersecting edge of the two cutting surfaces 28, 28'), respectively, and the other ends of the cutting edge 341 and the first connecting edge 342 away from the center 26 are connected to the first cutting edge 343, in one embodiment, the cutting edge 341 and the first connecting edge 342 are opposite and parallel. The minor face 36 includes a back side 361, a second connecting side 362, a second cutting edge 363 and a minor face outer edge 364, the second connecting side 362 is connected in parallel with the first connecting side 342, the two back sides 361 and 361 'of the two minor face 36 and 36' are respectively extended from the two opposite ends of the face center 26, one end of the second cutting edge 363 is connected to the second connecting side 362 and intersects with the first cutting edge 343 of the major face 34, the other end of the second cutting edge 363 is connected to one end of the minor face outer edge 364, and the other end of the minor face outer edge 364 is connected to one end of the back side 361 far from the face center 26. The minor cutting surface 38 extends from the first cutting edge 343 of the major cutting surface 34 and the second cutting edge 363 of the minor cutting surface 36 and is inclined toward the shank section 22 (shown in fig. 2), and in one embodiment, the minor cutting surface 38 includes a minor cutting edge 381 and a peripheral edge 382, wherein the minor cutting edge 381 continues to the cutting edge 341 of the major cutting surface 34.

Fig. 4 is a top view of the end face of a drill structure according to a second embodiment of the present invention, as shown in fig. 4, two cutting faces 28, 28 'are formed on two sides of a face center 26 obliquely toward a shank section 22 (shown in fig. 2), each cutting face 28, 28' includes a main face 34, 34 ', a minor face 36, 36' and a

minor face

38, 38 ', and the main difference between the second embodiment and the first embodiment is that the area of each main face 34, 34' gradually widens from the face center 26 toward the outer periphery to be a slightly fan-shaped design, that is, the thickness t of the cutting face 28, 28 'shown in the second embodiment is smaller than that of the cutting face 28, 28' shown in the first embodiment, so that the drilling resistance can be reduced and the service life of the edge section 24 (shown in fig. 2) can be increased.

Fig. 5 is a top view of the end face of a drill structure according to a third embodiment of the present invention, as shown in fig. 5, two corresponding cutting faces 28, 28 are formed on two sides of the center 26 of the cutting face obliquely toward the shank section 22 (shown in fig. 2), each cutting face 28, 28 includes a main cutting face 34, 34 ', a minor cutting face 36, 36 ' and a minor cutting face 38, 38 ', wherein a partial cutting edge 341 of the main cutting face 34 adjacent to the center 26 of the cutting face and a partial back edge 361 ' of the minor cutting face 36 ' adjacent to the center 26 of the cutting face jointly form a main groove 40 extending to the wall of the chip groove 32, and correspondingly, a partial cutting edge 341 ' of the main cutting face 34 ' adjacent to the center 26 of the cutting face and a partial back edge 361 of the minor cutting face 36 adjacent to the center 26 of the cutting face jointly form a main groove 40 ' extending to the wall of the chip groove 32 '; in addition, the primary grooves 42 and 42 'are formed in the middle section of each cutting edge 341 and 341', and the design of forming the primary grooves 40 and 40 'and the secondary grooves 42 and 42' on the cutting tool surface can reduce the chips by the discontinuous linear cutting lines, so as to prevent the chips from being rolled on the tail end of the blade section in a lump shape, and further improve the drilling quality of the drill bit structure.

Fig. 6 is a top view of the drill structure according to a fourth embodiment of the present invention, as shown in fig. 6, two cutting tool surfaces 28, 28 ' are formed on two sides of the center 26 of the cutting tool surface obliquely toward the shank section 22 (shown in fig. 2), each cutting tool surface 28, 28 ' includes a main tool surface 34, 34 ', a minor tool surface 36, 36 ' and a

minor tool surface

38, 38 ', and the main difference between the fourth embodiment and the first embodiment is that the center 26 of the cutting tool surface is formed by a first edge 344, 344 ' of each main tool surface 34, 34 ' and a second edge 365, 365 ' of each minor tool surface 36, 36 '.

In the first, second, third and fourth embodiments, the two minor cutting surfaces 38, 38 ' are formed by chamfering the opposite corners of the two cutting surfaces 28, 28 ' to form the minor cutting surfaces 38, 38 ' at the intersections of the major cutting surfaces 34, 34 ' and the minor cutting surfaces 36, 36 '. Taking the cutting blade surfaces 28, 28 ' of the first embodiment shown in fig. 3 as an example, a first distance w1 is provided between the first cutting edges 343, 343 ' of the two major blade surfaces 34, 34 ', a second distance w2 is provided between the peripheral edges 382, 382 ' of the two minor blade 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%.

Referring to fig. 2 again, two cutting tool faces 28, 28 'are located on both sides of the tool face center 26, and a tip angle θ 1 is between 120 degrees and 185 degrees, and the auxiliary tool faces 38, 38' are formed by chamfering the cutting tool faces 28, 28 ', the auxiliary tool faces 38, 38' are inclined toward the shank section 22 and form an angle θ 2 with a central axis of the edge section 24, and the angle θ 2 is 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 invention, the design of forming the auxiliary tool face by chamfering the cutting tool face can greatly reduce the contact area between the cutting tool face and a plate, so that the tool face is not easy to break and the quality of a hole wall can be greatly improved; moreover, through the connection of the auxiliary cutting edge of the auxiliary tool face and the cutting edge of the main tool face, the cutting line of the main tool face can be increased, so that the cutting capability during drilling is enhanced, and the quality of the hole wall can be improved.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.

Claims

1. A drill bit structure, comprising:

a shank section; and

a blade section sets up in the one end of this stalk section, and the foremost end of this blade section sets up a blade center, and this knife face center both sides are formed with the cutting knife face of bisymmetry towards this stalk section direction slant, and the periphery of two this cutting knife faces is respectively along the outer peripheral face of this blade section backward extension spiral winding in order to form two spiral side blades and two rows of bits ditches, and two this cutting knife faces have an intersection edge, and this intersection edge is located this knife face center, and each this cutting knife face contains:

the cutting edge and the first connecting edge are respectively extended from two opposite ends of the intersected edge, and one ends of the cutting edge and the first connecting edge, which are far away from the intersected edge, are connected with the first cutting edge;

the auxiliary knife face comprises a knife back edge, a second connecting edge, a second cutting edge and an auxiliary knife face outer edge, the second connecting edge is connected with the first connecting edge, one end of the second cutting edge is connected with the second connecting edge and the first cutting edge of the main knife face, and the other end of the second cutting edge is connected with the auxiliary knife face outer edge; and

and the auxiliary knife face is arranged on the first cutting edge of the main knife face and the second cutting edge of the auxiliary knife face in an extending way and inclines towards the handle section.

2. The drill bit structure of claim 1, wherein the auxiliary cutting edge comprises an auxiliary cutting edge and a peripheral edge, the auxiliary cutting edge continuous with the cutting edge of the primary cutting face.

3. The drill bit structure of claim 2, wherein a first distance is provided between the first cutting edges of the two primary cutting surfaces, a second distance is provided between the peripheral edges of the two secondary cutting surfaces, the first distance is smaller than the second distance, and a ratio of the first distance to the second distance is between 30% and 95%.

4. The drill bit structure as claimed in claim 1, wherein the two back edges of the two auxiliary cutting surfaces extend from two opposite ends of the center of the cutting surface, and one end of the back edge far from the center of the cutting surface is connected with the outer edge of the auxiliary cutting surface.

5. The drill structure of claim 4, wherein the area of each of the rake faces gradually widens from the center of the rake face toward the outer peripheral direction.

6. The drill bit structure of claim 4, wherein a portion of the cutting edge of each cutting blade face adjacent to the center of the blade face and a portion of the land edge of the other cutting blade face adjacent to the center of the blade face together form a primary groove, the primary groove extends to the wall of each chip removal groove, and a middle section of each cutting edge forms a primary groove.

7. The drill bit structure of claim 1, wherein the intersecting edge is formed by a continuation of a first edge of the major face of one of the cutting faces and a second edge of the minor face of the other of the cutting faces.

8. The drill structure of claim 1 wherein the minor flank inclined toward the shank section has an angle between 10 degrees and 85 degrees with a central axis of the blade section, and the major flanks flank on either side of the center of the flank face define a tip angle between 120 degrees and 185 degrees.

9. The drill bit structure as claimed in claim 1, wherein the two auxiliary cutting surfaces are formed by chamfering the opposite corners of the two cutting surfaces.

10. The drill bit structure of claim 1, wherein the shank section has an outer diameter between 3.17 mm and 3.18 mm, and the blade section has an outer diameter between 0.075 mm and 3.175 mm, or between 3.175 mm and 6.5 mm.