CN116061263A - Drill bit for soft material - Google Patents

Abstract

The invention provides a drill bit for soft materials, which comprises a drill bit body, wherein a first chip groove and a second chip groove are spirally arranged on the peripheral surface of the drill bit body, a tip is arranged at one end of the drill bit body, the tip comprises a first cutter surface and a second cutter surface, a chisel edge is formed by intersecting the first cutter surface and the second cutter surface, a first main cutting edge is formed between the first cutter surface and the first chip groove, a second main cutting edge is formed between the second cutter surface and the second chip groove, a first clearance part is arranged between the first chip groove and the second cutter surface, a second clearance part is arranged between the second chip groove and the first cutter surface, a first auxiliary cutting edge is formed by intersecting the first clearance part and the first cutter surface, and the second clearance part is positioned between the first main cutting edge and the chisel edge, a second auxiliary cutting edge is formed by intersecting the second cutter surface, and the second clearance part is positioned between the second main cutting edge and the chisel edge. The drill bit for soft materials has good chip removal capability, can prevent the occurrence of sticking of cutters, can reduce the drill resistance of the drill bit, and can greatly reduce the problem of poor chip removal of soft material drilling.

Description

Drill bit for soft material

Technical Field

The invention relates to the technical field of drilling processing, in particular to a drill bit for soft materials.

Background

Twist drills are a common drilling tool for PCB boards and generally comprise a shank portion and a cutting portion, the drill tip portion of which mainly performs the cutting function when drilling. Referring to fig. 1, the prior art drill bit includes a first major face 100, a second major face 110, a first minor face 120, and a second minor face 130, and a chisel edge grinding groove 160 is provided between a chisel edge 140 and junk slots 150 of the drill bit to reduce the drill cutting force of the drill bit. However, when a drill of the prior art is used for hole processing on a soft material, problems of deformation, sticking of a cutter and burrs are likely to occur due to low melting point and insufficient hardness of the soft material. Especially, the traditional drill bit has the advantages that the chip removal space is too small, so that the highest temperature of cutting is located at the cutting edge, the viscosity of soft materials is higher when the temperature is higher, extrusion force is easily generated when the chip removal space is insufficient, chips are stuck on the chip removal groove, chip removal is insufficient, and even the situation of cutter breakage occurs.

Accordingly, there is a need for improvements to existing drill bits to meet the hole machining requirements for soft materials.

Disclosure of Invention

The invention aims to provide a drill bit for soft materials, which has good chip removal capability, prevents the occurrence of sticking of cutters, can reduce the drill resistance of the drill bit, and can greatly reduce the problem of poor chip removal when the drill bit is used for processing soft material holes.

In order to achieve the above object, the invention provides a drill bit for soft materials, which comprises a drill bit body, wherein a first chip groove and a second chip groove which are symmetrical in the center are spirally arranged on the peripheral surface of the drill bit body along the axial direction of the drill bit body, one end of the drill bit body is provided with a tip part, the tip part comprises a first cutter surface and a second cutter surface which are symmetrical in the center, a chisel edge is formed by intersecting the first cutter surface and the second cutter surface, a first main cutting edge is formed between the first cutter surface and the first chip groove, a second main cutting edge is formed between the second cutter surface and the second chip groove, a first clearance part is arranged between the first chip groove and the second cutter surface, a second clearance part is arranged between the second chip groove and the first cutter surface, a first auxiliary cutting edge is formed by intersecting the first cutter surface and is positioned between the first main cutting edge and the chisel edge, and a second clearance part is formed between the second auxiliary cutting edge and the second cutter surface.

Compared with the prior art, the drill bit for soft materials has the advantages that the first chip groove and the second chip groove are used for chip removal of the first main cutting edge and the second main cutting edge, the first clearance part is arranged between the first chip groove and the second cutter surface, and the second clearance part is arranged between the second chip groove and the first cutter surface, namely, the clearance part with a groove structure is formed by grinding a chisel edge grinding groove and a cutter surface connected with the chisel edge grinding groove in the traditional drill bit, so that the clearance space is greatly improved, the chip removal capacity of the drill bit can be well improved, the occurrence of sticking of a cutter is prevented, the chisel edge distance can be reduced, the sharpness of the drill bit is improved, the drill resistance of the drill bit is reduced, and the problem of poor chip removal when the drill bit is used for soft material hole processing can be greatly reduced.

Preferably, the first cutting edge and the second cutting edge which are centrosymmetric along the axial direction of the drill body are spirally arranged on the peripheral surface of the drill body, a first clearance groove is arranged between the second cutting edge and the first chip groove, and a second clearance groove is arranged between the first cutting edge and the second chip groove.

Preferably, the first tool face comprises a first main tool face and a first chamfer face, the first main cutting edge comprises a first cutting main edge and a first chamfer cutting edge, the first chamfer face is positioned between the first cutting edge and the first main tool face, the first cutting main edge is formed between the first main tool face and the first chip groove, the first chamfer face and the first chip groove form the first chamfer cutting edge,

the second tool face comprises a second main tool face and a second chamfer face, the second main cutting edge comprises a second cutting main edge and a second chamfer cutting edge, the second chamfer face is located between the second cutting edge and the second main tool face, the second cutting main edge is formed between the second main tool face and the second chip groove, and the second chamfer cutting edge is formed between the second chamfer face and the second chip groove.

The helix angles of the first chip removal groove and the second chip removal groove are 20-50 degrees.

Preferably, the first space-avoiding part is a cylindrical surface.

Preferably, the axial angle of the first clearance is smaller than the helix angle of the first junk slot.

Preferably, the axial angle of the first clearance portion is different from the helix angle of the first junk slot by 0-10 degrees.

Preferably, the chamfer of the first chamfer surface and the chamfer of the second chamfer surface are both 80-100 degrees.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a prior art drill bit.

Fig. 2 is a perspective view of the drill bit for soft material of the present invention.

Fig. 3 is a perspective view of the drill for soft material shown in fig. 2 at another angle.

Fig. 4 is a top view of the drill bit for soft material shown in fig. 2.

Fig. 5 is the same as fig. 2 for showing the axial angle α of the first clearance portion.

Reference numerals illustrate:

the drill body 10, the first chip groove 11, the second chip groove 12, the tip 13, the first blade surface 14, the first main blade surface 141, the first chamfer surface 143, the second blade surface 15, the second main blade surface 151, the second chamfer surface 153, the chisel edge 16, the first main cutting edge 17, the first main cutting edge 171, the first chamfer cutting edge 173, the second main cutting edge 18, the second main cutting edge 181, the second chamfer cutting edge 183, the first relief portion 19, the second relief portion 20, the first minor cutting edge 21, the second minor cutting edge 22, the first margin 23, the second margin 24, the first relief groove 25, the second relief groove 26, the cylindrical rotary shaft 27, and the center shaft 28.

Detailed Description

In order to describe the technical content and constructional features of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 2-4, the present invention provides a drill bit for soft materials, which comprises a drill bit body 10, wherein a first chip groove 11 and a second chip groove 12 which are symmetrical in a central manner along an axial direction of the drill bit body 10 are spirally arranged on a peripheral surface of the drill bit body 10, a tip 13 is arranged at one end of the drill bit body 10, the tip 13 comprises a first cutter surface 14 and a second cutter surface 15 which are symmetrical in a central manner, a chisel edge 16 is formed by intersecting the first cutter surface 14 and the second cutter surface 15, a first main cutting edge 17 is formed between the first cutter surface 14 and the first chip groove 11, a second main cutting edge 18 is formed between the second cutter surface 15 and the second chip groove 12, a first clearance part 19 is arranged between the first chip groove 11 and the second cutter surface 15, a second clearance part 20 is arranged between the second chip groove 12 and the first cutter surface 14, the first clearance part 19 intersects the first cutter surface 14 to form a first auxiliary cutting edge 21 and is positioned between the first main cutting edge 17 and the chisel edge 16, and the second clearance part 20 intersects the second cutter surface 15 to form a second auxiliary cutting edge 22 and is positioned between the second main cutting edge 22 and the chisel edge 16.

It can be understood that the drill bit for soft materials of the present invention uses the first chip groove 11 and the second chip groove 12 as the first main cutting edge 17 and the second main cutting edge 18 and the first minor cutting edge 21 and the second minor cutting edge 22 for chip removal, and the first clearance portion 19 is provided between the first chip groove 11 and the second tool face 15, and the second clearance portion 20 is provided between the second chip groove 12 and the first tool face 14, that is, the clearance portion with a groove structure is formed by polishing the chisel edge grinding groove and the connected corresponding tool face in the conventional drill bit, so that the clearance space is greatly improved, the chip removal capability of the drill bit can be well improved, the occurrence of sticking of the drill bit can be prevented, the sharpness of the drill bit can be further improved, the drill resistance of the drill bit can be reduced, and the problem of poor chip removal of the drill bit when the drill bit is used for soft material hole processing can be greatly reduced.

Referring to fig. 2-3, the first margin 23 and the second margin 24 which are centrosymmetric along the axial direction of the drill body 10 are spirally arranged on the peripheral surface of the drill body 10, a first clearance groove 25 is arranged between the second margin 24 and the first chip groove 11, a second clearance groove 26 is arranged between the first margin 23 and the second chip groove 12, in the drilling process, the first margin 23 and the second margin 24 have guiding function, so that the stability in the drilling process can be ensured, and the first margin 23 and the second margin 24 can play a supporting role in the drilling process, thereby ensuring the hole position precision of hole machining, and meanwhile, the clearance space is increased by arranging the first clearance groove 25 and the second clearance groove 26, the heat dissipation is accelerated, the temperature is effectively reduced, the temperature of the first main cutting edge 17 and the second main cutting edge 18 is further reduced, and the cutter breaking risk is reduced.

Referring to fig. 4, the first rake surface 14 includes a first main rake surface 141 and a first chamfer surface 143, the first main cutting edge 17 includes a first cutting main edge 171 and a first chamfer cutting edge 173, the first chamfer surface 143 is located between the first margin 23 and the first main rake surface 141, the first cutting main edge 171 is formed between the first main rake surface 141 and the first chip groove 11, the first chamfer surface 143 and the first chip groove 11 form the first chamfer cutting edge 173, the second rake surface 15 includes a second main rake surface 151 and a second chamfer surface 153, the second main cutting edge 18 includes a second cutting main edge 181 and a second chamfer cutting edge 183, the second chamfer surface 153 is located between the second margin 24 and the second main rake surface 151, the second main cutting main edge 181 is formed between the second main rake surface 151 and the second chip groove 12, and the second chamfer surface 153 and the second chip groove 12 form the second chamfer cutting edge 183. It will be appreciated that the provision of the first chamfer surface 143 and the second chamfer surface 153 can reduce the size of burrs at the drill hole outlet during drilling due to the action of the first chamfer cutting edge 173 and the second chamfer cutting edge 183, thereby avoiding the generation of burrs and improving the drilling quality.

In some embodiments, the helix angles of the first chip groove 11 and the second chip groove 12 are 20-50 degrees, and the helix angles of the first chip groove 11 and the second chip groove 12 are set to 20-50 degrees, so that the rigidity and strength of the drill for soft materials are good and the chip removing effect is excellent. The helix angles of the first flutes 11 and the second flutes 12 are, by way of example, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, but are not limited to the recited values, and other non-recited values within the ranges described above are equally applicable.

Referring to fig. 4-5, the axial angle α of the first clearance portion 19 is smaller than the helix angle of the first junk slot 11, so that the design can improve the smoothness of junk discharge. It will be appreciated that the first relief portion 19 is a curved surface that forms a concave recess between the first junk slot 11 and the first and second rake surfaces 14, 15, and in this embodiment, the first relief portion 19 is a curved surface that forms between the first junk slot 11 and the first and second major rake surfaces 141, 151, 153. Similarly, the axial angle of the second clearance portion 20 is smaller than the helix angle of the second flute 12, and the second clearance portion 20 is a curved surface formed between the second flute 12 and the second major rake surface 151, the first major rake surface 141, and the first chamfer surface 143. In a preferred embodiment, the first space-avoiding portion 19 is cylindrical, which is also understood as a cylindrical surface formed by intersecting the tip portion 13 with the first space-avoiding portion 19, and an angle between the cylindrical surface rotation axis 27 of the first space-avoiding portion 19 and the central axis 28 of the drill body 10 is defined as an axial angle of the first space-avoiding portion 19 (the second space-avoiding portion 20 may refer to the description of the first space-avoiding portion 19). In some embodiments, the axial angle α of the first clearance portion 19 is different from the helix angle of the first junk slot 11 by 0-10 degrees, which is more beneficial to improving the junk capacity and reducing the drill resistance. As an example, the axial angle α of the first clearance 19 differs from the helix angle of the first flute 11 by 0 degrees, 1 degree to 5 degrees, 1 degree to 8 degrees, 2 degrees to 9 degrees, 5 degrees to 10 degrees, or the like, but is not limited to the recited values, and other non-recited values within the above-described ranges are equally applicable. In a specific embodiment, for example, the helix angles of the first junk slot 11 and the second junk slot 12 are both 40 degrees, the axial angles of the first space-avoiding portion 19 and the second space-avoiding portion 20 are both 35 degrees, and for example, the helix angles of the first junk slot 11 and the second junk slot 12 are both 45 degrees, and the axial angles of the first space-avoiding portion 19 and the second space-avoiding portion 20 are both 38 degrees, but not limited thereto.

Referring to fig. 4 to 5, the chamfer of the first chamfer surface 143 and the chamfer of the second chamfer surface 153 are both 80 degrees to 100 degrees, and the angle arrangement can effectively improve the deburring effect. The chamfer of the first chamfer surface 143 refers to an angle between the first chamfer surface 143 and the first main cutter surface 141; the chamfer of the second chamfer surface 153 refers to the angle between the second chamfer surface 153 and the second major rake surface 151. As an example, the chamfer angle of the first chamfer surface 143 is 80 degrees, 82 degrees, 84 degrees, 86 degrees, 88 degrees, 90 degrees, 92 degrees, 94 degrees, 96 degrees, 98 degrees, 100 degrees; the chamfer angle of the second chamfer surface 153 is 80 degrees, 82 degrees, 84 degrees, 86 degrees, 88 degrees, 90 degrees, 92 degrees, 94 degrees, 96 degrees, 98 degrees, 100 degrees, but is not limited to the recited values, and other non-recited values within the above-described respective ranges are equally applicable.

The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (8)

1. The utility model provides a drill bit for soft material, includes the drill bit body, the drill bit body global spiral is equipped with along the axial direction of drill bit body is central symmetry's first chip groove and second chip groove, its characterized in that, the one end of drill bit body is provided with the tip, the tip is including being central symmetry's first cutting face and second cutting face, first cutting face with intersect between the second cutting face forms the chisel edge, first cutting face with form first main cutting edge between the first chip groove, second cutting face with form the second main cutting edge between the second chip groove, first chip groove with be equipped with first clearance portion between the second cutting face, second clearance portion with be equipped with between the first cutting face, first clearance portion with first cutting face intersects and forms first minor cutting edge and be located between first main cutting edge and the chisel edge, second clearance portion with second cutting face intersects and forms the second minor cutting edge and be located between the chisel edge.

2. The drill bit for soft materials according to claim 1, wherein the drill bit body is spirally provided with a first margin and a second margin which are centrosymmetric along the axial direction of the drill bit body, a first clearance groove is arranged between the second margin and the first junk slot, and a second clearance groove is arranged between the first margin and the second junk slot.

3. The drill bit for soft materials according to claim 2, wherein the first rake surface comprises a first main rake surface and a first chamfer surface, the first main cutting edge comprises a first cutting main edge and a first chamfer cutting edge, the first chamfer surface is located between the first margin and the first main rake surface, the first cutting main edge is formed between the first main rake surface and the first chip groove, the first chamfer surface and the first chip groove form the first chamfer cutting edge,

the second tool face comprises a second main tool face and a second chamfer face, the second main cutting edge comprises a second cutting main edge and a second chamfer cutting edge, the second chamfer face is located between the second cutting edge and the second main tool face, the second cutting main edge is formed between the second main tool face and the second chip groove, and the second chamfer face and the second chip groove form the second chamfer cutting edge.

4. The drill bit for soft materials according to claim 1, wherein the helix angles of the first flutes and the second flutes are each 20 degrees to 50 degrees.

5. The drill bit for soft materials according to claim 1, wherein the first clearance portion intersects with the tip portion to form a cylindrical surface.

6. The drill bit for soft materials according to claim 5, wherein an axial angle of the first clearance portion is smaller than a helix angle of the first junk slot.

7. The drill bit for soft materials according to claim 6, wherein an axial angle of the first clearance portion is different from a helix angle of the first junk slot by 0 degrees to 10 degrees.

8. The drill bit for soft materials according to claim 1, wherein the chamfer angle of the first chamfer surface and the chamfer angle of the second chamfer surface are each 80 degrees to 100 degrees.

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