TWM563931U - Drill structure - Google Patents

Abstract

A drill structure includes a shank part and a flute part. A chisel edge is formed on the front end of the flute part. Two drill blades with tilt directions toward the shank part are respectively formed on the two sides of the chisel edge. At least one helical groove is spirally formed on the periphery of the flute part. Each drill blade has a primary relief surface and a secondary relief surface. The width of the inner edge of at least one primary relief surface is smaller than the width of the outer side of the primary relief surface. At least one assist relief surface, connected with the cutting edge of the primary relief surface of one drill blade and portion of the knife-back edge of the secondary relief surface of another drill blade, is extended to the inner wall of the helical groove. This drill structure can decrease the resistance of the drilling and increase the life of the flute part.

Description

Drill structure

The present invention relates to a drill bit structure, and more particularly to a drill bit structure having a smaller drill tip thickness to reduce drilling resistance under the borehole.

With the development of technology, the wires on the printed circuit board are gradually becoming thinner toward high-density and high-precision lines. In order to respond to the market's high quality, high demand and fast supply of highly competitive printed circuit boards, the industry's precision, strength and feed rate for micro drills used in printed circuit board drilling processes, Even the quality of the hole wall, and the processing conditions are getting higher and higher. Moreover, in practice, the industry usually performs the same drilling process on a plurality of stacked printed circuit boards to improve processing efficiency and reduce manufacturing costs. Therefore, the length of the drill used is long and must be Has sufficient strength and chip removal capability.

The conventional micro-drill mainly comprises a handle section and a blade section connecting one end of the handle section, and a cutting edge structure 10 is disposed at the foremost end of the blade section, as shown in FIG. 1 , which comprises two main cutter faces 12 , 12 ′ and The secondary faces 14, 14' are symmetrically disposed at a tip end point 16 for cutting the surface of the workpiece using the blade structure 10. The center width W _c of the main cutting faces 12, 12' is equal to the outer width W _{o of the} main cutting faces 12, 12'. When the drilling is performed, the thickness of the drill tip portion 18 is large, so that the drilling resistance is large, and the life of the drill spindle is caused. The blade surface structure 10 only includes the design of the two main knives 12, 12' and the secondary knives 14, 14', which also easily leads to the collapse of the knives during drilling.

In order to solve the above problems, one of the objects of the present invention is to provide a drill bit structure in which the width of the drill edge on the inner side of the main cutter face is smaller than the outer width of the main cutter face, so that the drill tip has a small thickness, so that the drill is drilled while drilling. The resistance is small and the spindle life of the blade section can be increased.

One of the purposes of this creation is to propose a drill bit structure, which can greatly increase the resistance of the cutter surface to wear and increase the service life of the drill bit by the structure of the four-knife surface and the inclined design of the auxiliary cutter surface.

In order to achieve the above object, the drill structure of the present embodiment comprises: a shank section; and a blade section disposed at one end of the shank section, the blade section having a core core having a core located at the blade section, and a blade section A drill tip is disposed at one end of the segment away from the shank portion, and a first cutting face and a second cutting face are obliquely formed on both sides of the drill tip toward the shank portion, and the first cutting face is first A second outer periphery of the outer periphery and the second cutter face extends around the outer peripheral surface of the blade section toward the shank section to form a first chip discharge groove and a second chip discharge groove. The first cutting edge includes a first major cutting surface and a first minor cutting surface, the first main cutting edge having a first cutting edge, a first cutting edge, a first connecting edge and a first outer edge The shortest distance between the two end points of the first outer edge defines a width of the outer side of the first main blade face, the first connecting edge is connected to the first minor blade face, and the first minor blade face comprises a first blade back edge. The second cutting edge includes a second major cutting surface and a second secondary cutting surface, and the second primary cutting edge has a second cutting edge, a second cutting edge, a second connecting edge and a second outer edge The shortest distance between the two ends of the second outer edge defines a width of the outer side of the second main blade face, the second connecting edge is connected to the second minor blade face, and the second minor blade face comprises a second blade back edge, first The drill edge and the second drill edge form a drill tip, the first drill edge is connected to the second cutter edge, and the second drill edge is connected to the first cutter edge. The first cutting edge of the first major cutting surface is not parallel to the first connecting edge, so that the width of the first cutting edge is smaller than the outer width of the first major cutting surface, and the first cutting edge is adjacent to the second cutting edge. a part of the second blade back edge of the edge of the drill edge is extended to extend a first minor blade surface to the wall surface of the first chip discharge groove; the second cutting edge of the second main blade face is not parallel with the second connecting edge, so that the second The width of the edge of the drill tip is smaller than the width of the outer side of the second major cutting surface, and the second cutting edge extends to a portion of the second cutting edge adjacent to the second cutting edge of the first cutting edge. The second chip discharges the wall of the groove.

In one embodiment, the drill tip includes a sharp point which is the intersection of the first connecting edge, the second connecting edge, the first cutting edge and the second cutting edge; in an embodiment, the first The minor blade surface and the second minor blade surface are respectively inclined toward the cusp and have a groove-like contour, or in another embodiment, the first minor blade surface and the second minor blade surface are respectively away from the outer side of the cusp Tilted and grooved profile.

In an embodiment, the first blade back edge and the second blade back edge are in a double arc shape, and the first blade back edge includes a first inner arc edge and a first outer arc edge, and the first inner arc edge is connected. The end of the second cutting edge is away from the end of the sharp point, and the back side of the second blade includes a second inner arc edge and a second outer arc edge, and the second inner arc edge connects the end of the first drill edge away from the sharp point. The first minor blade surface extends from the first cutting edge and the second inner arc edge to the wall surface of the first chip discharge groove, and the second minor blade surface extends from the second cutting edge and the first inner arc edge to the first The second chip discharges the wall of the groove.

In one embodiment, the radius of a section of the core is defined as a core thickness, and the outer width of the first major surface and the outer width of the second major surface are greater than the core thickness. In an embodiment, the area of the first main cutting edge is gradually widened from the edge of the first cutting edge toward the first outer edge, and the area of the second main cutting surface is from the edge of the second cutting edge to the direction of the second outer edge. Gradually widen.

A further embodiment of the present invention has a drill bit structure comprising: a shank section; and a blade section disposed at one end of the shank section, the blade section having a core having a core located at the blade section, the blade section being remote from the blade section One end of the shank portion is provided with a drill tip portion, and the first side of the drill tip portion is obliquely formed toward the shank portion to form a first cutter surface and a second cutter surface, and a first outer periphery of the first cutter surface is along The outer peripheral surface of the blade section extends around the shank section to wind the core to form a first chip discharge groove. The first cutting face includes a first main cutting face and a first minor cutting face, and the first main cutting face has a first cutting edge, a first cutting edge edge, a first connecting edge and a first outer edge The shortest distance between the two end points of the first outer edge defines a width outside the first main blade face, the first connecting edge is connected to the first minor face, and the first minor face comprises a first blade back. The second cutting surface includes a second main cutting surface and a second minor cutting surface, wherein the second main cutting surface is triangular, and includes a second cutting edge, a second connecting edge and a second outer edge. The second connecting edge is connected to the second cutting edge, and the second cutting edge comprises a second cutting edge, a third outer edge and a fourth outer edge, the first cutting edge and the second cutting edge The first cutting edge is connected to the second cutting edge, and the second cutting edge is connected to the first cutting edge, wherein the first cutting edge of the first main cutting surface is not the first The connecting edges are parallel, such that the width of the first cutting edge is smaller than the width of the outer side of the first main cutting surface, and the first cutting edge and the second cutting edge are adjacent to a part of the second cutting edge of the first cutting edge edge. A minor blade extends to the wall of the first chip discharge groove.

In one embodiment, the drill tip includes a sharp point, which is the intersection of the first connecting edge, the second connecting edge, the first cutting edge and the second cutting edge edge, and the first minor blade surface is attached to The direction of the cusp is inclined and has a groove-like profile, or the first minor blade surface is inclined toward the outer side away from the cusp and has a groove-like profile. In one embodiment, the area of the first major flank is gradually widened from the edge of the first drill edge toward the direction of the first outer rim.

In an embodiment, the second blade back has a double arc shape, and the second knife back side includes a second inner arc edge and a second outer arc edge, and the second inner arc edge is connected to the first drill edge. An end away from the cusp, wherein the first minor blade surface extends from the first cutting edge and the second inner arc edge to the wall surface of the first chip discharge groove; wherein the second inner edge of the second cutting edge is A cutting edge is smooth and has no creases.

The detailed description is as follows, and the preferred embodiment is not intended to limit the present invention.

Please refer to FIG. 2 , which is a schematic view of a drill bit structure according to an embodiment of the present invention. As shown, the drill bit 20 includes a shank section 22 and a blade section 24 , and the blade section 24 is disposed at one end of the shank section 22 . The blade section 24 has a core 241 located at the cylindrical core of the blade section 24, as shown by the dashed line in the schematic view of FIG. 2, and the front end of the blade section 24 is provided with a knurling structure 26, wherein the foremost end is, for example, a blade section 24. Along the one end of the shank portion 24, the flank structure 26 includes a drill tip portion 28 disposed at the foremost end of the blade portion 24, and the two sides of the drill tip portion 28 are obliquely formed toward the shank portion 22 to form a first cutter face 30. And a second cutting face 32, a first outer periphery (not labeled) of the first cutting face 30 and a second outer periphery 321 of the second cutting face 32 respectively along the outer peripheral surface of the blade section 24 The shank section 22 extends in a direction of winding the core 241 to form a first chip discharge groove 34 and a second chip discharge groove 36, wherein a radius of a section of the core 241 is defined as a web thickness.

Following the above description, FIG. 3a and FIG. 3b are respectively a schematic view of the blade surface structure and a side view of the drill bit of the drill bit structure of the first embodiment. As shown in FIG. 3a, the first cutter blade 30 includes a first major blade surface 38 and a first minor blade surface 40. The second cutter blade surface 32 includes a second major blade surface 42 and a second minor blade surface 44. One apex of each of the first major flank 38, the first minor flank 40, the second major flank 42 and the second minor lobes 44 intersects at one of the cusps o of the drill tip; the first major flank 38 has a first The cutting edge 381, a first cutting edge 382, a first connecting edge 383 and a first outer edge 384; the second major cutting surface 42 has a second cutting edge 421, a second cutting edge 422, a second connecting edge 423 and a second outer edge 424, the first cutting edge 382 and the second cutting edge 422 constitute the drill point portion 28, and the pointed point o is the first connecting edge 383, the second The intersection of the connecting edge 423, the first drill edge 382 and the second drill edge 422.

Wherein, the first connecting edge 382 is connected to the first minor surface 40, and the first cutting edge 382 is connected to the second minor plane 44, the second connecting edge 423 is connected to the second minor plane 44, and the second The cutting edge 422 is connected to the first cutting edge 40; wherein the first outer edge 384 of the first main cutting surface 38 is connected to one end of the first cutting edge 381 and one end of the first connecting edge 383, and the first outer edge The shortest distance between the two ends of the 384 second defines a first major outer edge width W _o1 , and the second outer edge 424 of the second major cutting surface 42 connects one end of the second cutting edge 421 and one end of the second connecting edge 423, and The shortest distance between the two ends of the second outer edge 424 defines a second major face outer width W _o2 . As shown in FIG. 3a, the first cutting edge 381 of the first major cutting edge 38 is not parallel to the first connecting edge 383, and the width W _{c 1} of the first cutting edge 382 is smaller than the outer width W _{o1 of the} first major cutting edge. That is, the area of the first major flank 38 is gradually widened by the first apex edge 382 toward the first outer rim 384 direction 384; the second cutting edge 421 of the second major flank 42 is not parallel to the second connecting edge 423, and The width W _{c 2 of the} second cutting edge 422 is smaller than the outer width W _o2 of the second main cutting surface, that is, the area of the second main cutting surface 42 is gradually widened by the second cutting edge 423 toward the second outer edge 424. .

Referring to FIG. 3a, the first minor surface 40 includes a first blade back 401, and the second minor surface 44 includes a second blade back 441. The first cutting edge 381 and the second blade back edge 441 are smoothly connected without a chamfer, and the first cutting edge 381 and the second minor blade surface 44 are adjacent to a portion of the second blade back edge 441 of the first cutting edge 382. The first minor blade surface 46 extends to the wall surface of the first chip discharge groove 34; the second cutting edge 421 is smoothly and without a chamfered connection of the first blade back edge 401, and the second cutting edge 421 is adjacent to the first minor blade face 40 A portion of the first cutting edge 401 of the second cutting edge 422 extends a second minor blade surface extension 48 to the wall surface of the second chip discharge groove 36. As shown in FIG. 3a and FIG. 3b, the first minor blade surface 46 and the second minor blade surface 48 are inclined toward the direction of the sharp point o and have a groove-like contour 50, and only the first auxiliary is disclosed in FIG. 3b. The blade surface 46 and the second minor blade surface 48 are symmetrically disposed on the other side centering on the point o. The first minor blade surface 46 and the second minor blade surface 48 have an angle θ1 with a horizontal plane, and the angle θ1 is between 0 degrees and 90 degrees. The first minor blade surface 46 and the second minor blade surface 48 are defined. A positive tilt angle.

In one embodiment, as shown in FIG. 3a, the first blade back 401 and the second blade back 441 are double curved, and the first blade back 401 includes a first inner arc edge 402 and a first outer arc. The side 403, and the first inner arc edge 402 is connected to the end of the second cutting edge 422 away from the point o and is smoothly and without the angle of the second cutting edge 421, and the second minor surface 48 is cut by the second The edge 421 and the first inner arc edge 402 extend to the wall surface of the second chip discharge groove 36; the second blade back edge 441 includes a second inner arc edge 442 and a second outer arc edge 443, and the second inner arc edge 442 connects the first cutting edge 382 away from the end of the point o and is smoothly and without the angle of the first cutting edge 381, and the first minor edge 46 is the first cutting edge 381 and the second inner edge 442. It extends to the wall surface of the first chip discharge groove 34.

4a and 4b are respectively a schematic view of a blade surface structure of the bit structure of the second embodiment and a side view of the drill bit portion. As shown in FIG. 4a and FIG. 4b, the difference between the drill bit structure of the second embodiment and the drill bit structure of the first embodiment is that the first minor cutter surface 46 and the second minor relief surface 48 of the drill bit structure of the second embodiment are respectively away from each other. The outer direction of the point o is inclined and has a groove-like contour 50. Only the first minor face 46 is disclosed in FIG. 4b, and the second minor face 48 is symmetrically disposed on the other side with the pointed point o as the center. The blade surface 46 and the second minor blade surface 48 have an angle θ2 with a horizontal plane, and the angle θ2 is between 90 degrees and 180 degrees. The first minor blade surface 46 and the second minor blade surface 48 are defined to have a negative inclination. angle.

In the drill bit structure of the second embodiment, as shown in FIG. 4a, the first blade back edge 401 and the second blade back edge 441 are in a double arc shape, and the first blade back edge 401 includes a first inner arc edge 402 and a first connection. An outer arc edge 403, and the first inner arc edge 402 is connected to the end of the second drill edge 422 away from the sharp point and is smoothly and non-angularly connected with the second cutting edge 421, and the second minor blade surface 48 is The second cutting edge 421 and the first inner arc edge 402 extend to the wall surface of the second chip discharge groove 36; the second blade back edge 441 includes a second inner arc edge 442 and a second outer arc edge 443, and the second inner portion The arc edge 442 is connected to the end of the first cutting edge 382 away from the point o and is smoothly and without the angle of the first cutting edge 381, and the first minor edge 46 is composed of the first cutting edge 381 and the second inner arc. The side 442 extends to the wall surface of the first chip discharge groove 34.

In the bit structure of the first embodiment and the second embodiment, the area of the first major cutting face 38 is gradually widened by the first cutting edge 382 toward the first outer edge 384, and the area of the second major cutting face 42 is The second cutting edge 422 is gradually widened toward the second outer edge 424 such that the first major outer width W _o1 and the second outer outer width W _{o2 are both} greater than the core thickness (not shown).

In the drill structure of the first embodiment and the second embodiment, since the first cutting edge 381 / the second cutting edge 421 are obliquely and not parallel to the first connecting side 383 / the second connecting side 423, the design is compared with the conventional one. For the cutting edge, the cutting length of the first cutting edge 381 and the second cutting edge 421 is longer, so the cutting force is larger; and the widths of the first cutting edge 382 and the second cutting edge 422 are respectively smaller than the first width W _o1 surgeon outer surface and a second outer surface of the main blade width W _o2, so having a smaller thickness of the drill tip from the first edge 382 and second edge 422 of the drill tip of the drill tip configuration of the portion 28, in borehole The current drilling resistance is small, and the spindle life of the blade section can be increased. Moreover, the design of the auxiliary bit structure inclined by the biasing direction or away from the cusp direction can greatly increase the resistance of the blade surface to wear and increase the service life of the drill bit.

FIG. 5a and FIG. 5b are respectively a schematic view showing the structure of the cutter surface of the drill bit structure of the third embodiment and a side view of the drill portion. As shown, a first cutting face 30' and a second cutting face 32' are formed on both sides of the drill tip 28'. A first outer periphery of the first cutting face 30' is along the blade section 24. The outer peripheral surface extends in the direction of the shank portion 22 (shown in FIG. 2) and forms a first chip discharge groove 34. The drill bit structure shown in the third embodiment is different from the first embodiment and the second embodiment. It is a single groove and the first cutting face 30' and the second cutting face 32' are not symmetrically arranged.

In the third embodiment, as shown in FIG. 5a, the first cutting face 30' includes a first major cutting face 38' and a first minor cutting face 40'. The first major cutting face 38' has a first cutting edge. 381', a first drill edge 382', a first connecting edge 383' and a first outer edge 384', the shortest distance between the two ends of the first outer edge 384' defines a first main knife The outer side width W _o1 , the first connecting side 383 ′ is connected to the first minor cutting surface 40 ′, and the first minor cutting surface 40 ′ includes a first cutting edge 401 ′′; the second cutting flank 32 ′ includes a second The main cutting face 42' and the second minor cutting face 44', the second major cutting face 42' is triangular, comprising a second cutting edge 422', a second connecting edge 423' and a second outer edge 424 ', the second connecting side 423' is connected to the second cutting edge 44', and the second cutting surface 44' includes a second cutting edge 441', a third outer edge 444' and a fourth outer edge 445'. The first drill edge 382' and the second drill edge 422' form a drill tip 28', the first drill edge 382' is connected to the second minor edge 44', and the second drill edge 422' Cooperating with the first cutting edge 40', wherein the first cutting edge 381' of the first major cutting surface 38' is not parallel to the first connecting edge 383', so that the width of the first cutting edge 382' is smaller than the first primary cutting edge The outer side width W _o1 , and the first cutting edge 381 ′ and the second cutting edge 441 ′ of the second cutting edge 44 ′ adjacent to the first cutting edge 382 ′ extend together with a first minor blade surface 46 To the wall surface of the first chip discharge groove 34.

Following the above description, in the third embodiment, the drill tip portion 28' includes a sharp point o, which is a first connecting edge 383', a second connecting edge 423', a first cutting edge 382' and a second drill. The intersection of the sharp edge 422', and the first minor blade surface 46 is inclined toward the sharp point o and has a groove-like contour 50. As shown in FIG. 5b, the first minor blade surface 46 has an angle with a horizontal plane. Θ1, the angle θ1 is between 0 degrees and 90 degrees, and the first minor surface 46 is defined to have a positive tilt angle. In one embodiment, the second blade back edge 441' of the second minor blade surface 44' has a double arc shape, and the second blade back edge 441' includes a second inner arc edge 442' and a second outer arc edge. 443 ′, and the second inner arc edge 442 ′ connects the first drill edge 382 ′ away from the end of the point o, wherein the second inner arc edge 442 ′ is smoothly and without a chamfered connection with the first cutting edge 381 ′, And the first minor face 46 extends from the first cutting edge and the 381' second inner arc edge 442' to the wall surface of the first chip discharge 34.

FIG. 6a and FIG. 6b are respectively a schematic view showing the structure of the cutter face of the drill bit structure of the fourth embodiment and a side view of the drill portion. As shown in FIG. 6a and FIG. 6b, the difference between the fourth embodiment and the drill bit structure of the third embodiment is that the first minor blade surface 46 in the fourth embodiment is inclined and grooved away from the outer side of the sharp point o. Contour 50. The first minor face 46 has an angle θ2 with a horizontal plane, and the included angle θ2 is between 90 degrees and 180 degrees, and the first minor face 46 is defined to have a negative inclination angle.

In the drill structure of the third embodiment and the fourth embodiment, the area of the first major cutting edge 38' is gradually widened from the first cutting edge 382' toward the first outer edge 384' due to the first cutting edge. edge 382 'is smaller than the width of the outer surface of the main blade width W _o1, so that the drill tip portion 28' having the smaller thickness, therefore nowadays drilling the borehole with less resistance, and increase the life of the blade section of the spindle. At the same time, the structure of the four-knife surface and the inclined design of the auxiliary knives can greatly increase the resistance of the knives to wear and increase the service life of the drill.

The embodiments described above are only for explaining the technical idea and characteristics of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement them according to the scope of the patent. That is, the equivalent changes or modifications made by the people in accordance with the spirit revealed by this creation should still be covered by the scope of the patent of this creation.

10‧‧‧Knife structure
12, 12'‧‧‧ main knives
14, 14' ‧ ‧ knives
16‧‧‧The tip of the knife
W _c ‧‧‧ center width
W _o ‧‧‧ outside width width outside
18‧‧‧Drill tip
20‧‧‧ drill bit
22‧‧‧ handle section
24‧‧‧blade section
241‧‧‧ drill core
26, 26'‧‧‧Knife structure
28, 28'‧‧‧ drill tip
30, 30'‧‧‧ first cutting surface
32, 32'‧‧‧second cutting surface
321‧‧‧Second outer periphery
34‧‧‧First chip discharge ditch
36‧‧‧Second chip discharge ditch
38, 38'‧‧‧ first main face
381, 381'‧‧‧ first cutting edge
382, 382'‧‧‧ first edge of the drill
383, 383'‧‧‧ first connecting edge
384, 384'‧‧‧ first rim
40, 40'‧‧‧ first knife face
401, 401'‧‧‧ first knife back
402‧‧‧First inner arc
403‧‧‧First outer arc
42, 42'‧‧‧second main face
421‧‧‧Second cutting edge
422, 422'‧‧‧second tip edge
423, 423'‧‧‧ second connecting edge
424, 424'‧‧‧ second outer edge
44, 44'‧‧‧ second knife face
441, 441'‧‧‧ second knife back
442, 442'‧‧‧ second inner arc
443, 443'‧‧‧ second outer arc
444'‧‧‧ third rim
445'‧‧‧ fourth outer edge
O‧‧‧ Point
W _o1 ‧‧‧The width of the outer side of the first main blade
W _o2 ‧‧‧The width of the outer side of the second main blade
W _c1 ‧‧‧Width
W _c2 ‧‧‧Width
46‧‧‧First minor knives
48‧‧‧Second minor knife face
50‧‧‧ditch profile θ1‧‧‧angle θ2‧‧‧ angle

Figure 1 shows a schematic view of a conventional drill bit. FIG. 2 is a schematic view showing the structure of a drill bit according to an embodiment of the present invention. 3a and 3b are respectively a schematic view showing the structure of the cutter face of the first embodiment and a side view of the drill portion. 4a and 4b are respectively a schematic view of a blade surface structure of the bit structure of the second embodiment and a side view of the drill bit portion. FIG. 5a and FIG. 5b are respectively a schematic view showing the structure of the cutter surface of the drill bit structure of the third embodiment and a side view of the drill portion. FIG. 6a and FIG. 6b are respectively a schematic view showing the structure of the cutter face of the drill bit structure of the fourth embodiment and a side view of the drill portion.

Claims (10)

A drill bit structure comprising: a shank section; and a blade section disposed at one end of the shank section, the blade section having a core of a core located in the blade section, the blade section being remote from the blade section One end of the shank portion is provided with a drill tip portion, and the two sides of the drill tip portion are obliquely formed toward the shank portion to form a first cutter surface and a second cutter surface. An outer periphery and a second outer periphery of the second cutter face respectively extend around the outer core surface of the blade section toward the shank section to form a first chip discharge groove and a second a chip discharge groove, wherein the first cutter face comprises a first main cutter face and a first minor cutter face, the first main cutter face has a first cutting edge, a first cutting edge edge and a first connecting edge And a first outer edge, the shortest distance between the two ends of the first outer edge defines a width of the outer side of the first main blade, the first connecting edge is connected to the first minor face, and the first time The blade surface includes a first knife edge, the second cutter surface includes a second major blade surface and a second minor blade surface, The second main knife mask has a second cutting edge, a second cutting edge, a second connecting edge and a second outer edge, and the shortest distance between the two ends of the second outer edge defines a second main knife An outer side width, the second connecting edge is connected to the second minor cutting surface, and the second minor cutting surface comprises a second cutting edge, the first cutting edge and the second cutting edge forming the drill The first cutting edge is connected to the second cutting edge, and the second cutting edge is connected to the first minor cutting surface, wherein the first cutting edge of the first main cutting surface is not Parallel to the first connecting edge, the width of the first cutting edge is smaller than the outer width of the first main cutting surface, and the first cutting edge and the second minor surface are adjacent to a portion of the first cutting edge The second cutting edge of the second cutting edge extends to the wall surface of the first chip discharging groove, and the second cutting edge of the second main cutting surface is not parallel with the second connecting edge, so that the second The width of the edge of the drill tip is smaller than the width of the outer side of the second main face, and the second cutting edge is adjacent to the second cutting edge of the first cutting edge The second portion of the blade back edge disposed coextensive a second secondary relief surface extending to the groove wall surface of the second chip discharging. The drill bit structure of claim 1, wherein the drill tip portion includes a sharp point, the first connecting edge, the second connecting edge, the first drill edge and the second drill edge An intersection point, the first minor blade surface and the second minor blade surface are respectively inclined toward the cusp and have a groove-like contour, or the first minor blade surface and the second minor blade surface are respectively away from the tip The outer side of the point is inclined and has a grooved profile. The drill bit structure of claim 2, wherein the first blade back edge and the second blade back edge are in a double arc shape, and the first blade back edge comprises a first inner arc edge and a first outer arc edge. And the first inner arc edge is connected to one end of the second drill edge away from the cusp, the second blade back side includes a second inner arc edge and a second outer arc edge, and the second inner arc edge Connecting one end of the first cutting edge away from the cusp, wherein the first minor surface extends from the first cutting edge and the second inner edge to a wall surface of the first chip discharge groove, the first The second minor blade surface extends from the second cutting edge and the first inner arc edge to a wall surface of the second chip discharge groove. The drill bit structure of claim 1, wherein a radius of a section of the core is defined as a core thickness, and a width of the outer side of the first main flank and a width of an outer side of the second main flank are greater than the core thickness. The drill bit structure of claim 1, wherein the area of the first major cutting edge is gradually widened from the first edge of the cutting edge toward the first outer edge, and the area of the second major cutting surface is determined by the second drilling The sharp edge gradually widens toward the second outer edge. A drill bit structure comprising: a shank section; and a blade section disposed at one end of the shank section, the blade section having a core having a core located in the blade section, the blade section being the most A drill point is disposed at an end of the shank portion, and a first cutting surface and a second cutting surface are obliquely formed on both sides of the shank portion toward the shank portion, and the first cutting surface is a first outer periphery extending around the outer peripheral surface of the blade section toward the shank section to form a first chip discharge groove, wherein the first cutter face includes a first main flank and a first a minor cutting surface, the first main knife mask having a first cutting edge, a first cutting edge, a first connecting edge and a first outer edge, the shortest between the two end edges of the first outer edge The distance defines a width outside the first main cutting surface, the first connecting edge is connected to the first minor cutting surface, and the first minor cutting surface comprises a first cutting edge, the second cutting surface comprises a second major cutting surface And a second knife surface, the second main knife surface is triangular, comprising a second drill edge and a second connection a second connecting edge and a second outer edge, the second connecting edge is connected to the second minor edge, and the second minor edge comprises a second blade edge, a third outer edge and a fourth outer edge The first drill edge and the second drill edge form the drill tip, the first drill edge is connected to the second minor edge, and the second drill edge and the first a first cutting edge of the first major cutting surface is not parallel to the first connecting edge, such that the width of the first cutting edge edge is smaller than the outer width of the first main cutting edge, and the first A cutting edge and a portion of the second cutting edge adjacent to the first cutting edge edge extend a first minor blade surface extending to a wall surface of the first chip discharge groove. The drill bit structure of claim 6, wherein the drill tip portion includes a sharp point, the first connecting edge, the second connecting edge, the first cutting edge edge and the second cutting edge edge And the first minor surface is inclined toward the sharp point and has a groove-like contour, or the first minor surface is inclined toward the outer side away from the sharp point and has a groove-like contour. The drill bit structure of claim 7, wherein the second blade back has a double arc shape, and the second knife back side comprises a second inner arc edge and a second outer arc edge, and the second inner arc An end of the first cutting edge is away from the cusp, wherein the first minor edge extends from the first cutting edge and the second inner edge to a wall surface of the first chip discharge groove. The bit structure of claim 8, wherein the second inner arc edge of the second minor face is smoothly and non-angularly connected to the first cutting edge. The drill bit structure of claim 6, wherein the area of the first major cutting edge is gradually widened from the first edge of the cutting edge toward the first outer edge.