CN216398154U

CN216398154U - Drill bit

Info

Publication number: CN216398154U
Application number: CN202122410907.3U
Authority: CN
Inventors: 刘小琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-02
Filing date: 2021-10-02
Publication date: 2022-04-29
Anticipated expiration: 2031-10-02

Abstract

The utility model provides a drill bit, and belongs to the technical field of hardware tools. It has solved current drill bit inefficiency scheduling technical problem. The drill bit comprises a drill rod and a cutter head, wherein the cutter head is fixedly arranged at one end part of the drill rod, the cutter head is provided with at least two cutting edges, all the cutting edges are uniformly distributed at intervals along the circumferential direction of the cutter head, each cutting edge comprises a vertical section and an inclined section, the length direction of the vertical section is consistent with the axial direction of the drill rod, the inclined section obliquely extends from one end of the vertical section to the direction of a central line of the cutter head, and the inclined sections of all the cutting edges form a cutter point after being converged at the central line of the cutter head; the outer side surface of the vertical section is provided with a first inclined cutting edge surface, and the outer side surface of the inclined section is provided with a second inclined cutting edge surface. The cutting efficiency of the drill bit is greatly improved, and the cutting edge is not easy to damage.

Description

Drill bit

Technical Field

The utility model belongs to the technical field of hardware tools, and relates to a drill bit.

Background

The drill bit is a common tool for machining or production operation, can drill holes on a workpiece or a construction object, is applied to various electric drills, drilling machines or drilling machines, has a wide application range, is also diversified in types, generally comprises a cutter bar, and is provided with a tip end, a cutting blade is arranged at the tip end, a chip removal groove is formed in the cutter bar, and the drill bit rotates around a vertical shaft and moves axially during use. The workpiece or the construction object is cut into a hole under the action of the torque and the axial force of the drill bit, and the chips are discharged from the chip grooves.

While drill bit development has been over the years and manufacturing processes have matured, there is room for improvement in drill bits in terms of operational efficiency, useful life, and the like.

Disclosure of Invention

The utility model provides a drill bit aiming at the problems in the prior art, and the technical problems to be solved by the utility model are as follows: how to improve the drilling efficiency when the drill bit is used.

The purpose of the utility model can be realized by the following technical scheme:

a drill bit comprises a drill rod and a cutter head, wherein the cutter head is fixedly arranged at one end of the drill rod, and the drill bit is characterized in that the cutter head is provided with at least two cutting edges, all the cutting edges are uniformly distributed at intervals along the circumferential direction of the cutter head, each cutting edge comprises a vertical section and an inclined section, the length direction of the vertical section is consistent with the axial direction of the drill rod, the inclined section obliquely extends from one end of the vertical section to the direction of the central line of the cutter head, and the inclined sections of all the cutting edges form a cutter point after being converged at the central line of the cutter head; the outer side surface of the vertical section is provided with a first inclined cutting edge surface, and the outer side surface of the inclined section is provided with a second inclined cutting edge surface.

The principle is as follows: the common drill in the prior art usually has two or four cutting edges which are arranged oppositely, the cutting edges are arc-shaped and are directly converged to one point to form a tool nose, and the cutting efficiency is low; the cutter head structure in the technical scheme is optimized and improved, and the cutter head structure is suitable for drill bits with more than two cutting edges. Specifically, each cutting edge is modified to include a vertical section that is a portion adjacent to the drill rod and an inclined section that is a portion forming the tip. Meanwhile, an inclined cutting edge surface I is arranged on the outer side surface of the vertical section, and an inclined cutting edge surface II is arranged on the outer side surface of the inclined section; through the contrast of actual production experiment data, cutting efficiency has obtained promoting by a wide margin, and the cutting edge is difficult to damage.

In the drill bit, the drill rod and the cutter head are coaxially arranged, and an included angle alpha formed by a straight line where the inclined section is located and a straight line where the vertical section is located is 60-85 degrees. Preferably, α is 70 °.

In the drill, an included angle beta between a first blade face on the cutting edge and a tangent plane of the drill rod at the joint of the cutting edge and the drill rod is 15-30 degrees. Further, β is preferably 20 °.

Through further improvement, the angle data are optimized, so that the cutting efficiency is further improved.

In the drill bit, all the first blade surfaces and the second blade surfaces are inclined in the same anticlockwise or clockwise direction; the cutting edge is also provided with a third edge surface extending from the side surface of the cutting edge to one side of the second edge surface; the other side opposite to the cutting edge is also provided with an edge surface four extending from the side surface of the cutting edge to the other side of the edge surface two.

In the drill, the number of the cutting edges is four, and the cutter head is cross-shaped. The tool bit can be welded on the drill rod, and can also adopt an integrally formed processing technology.

Preferably, in the drill bit, a cross-shaped groove is formed in the end of the drill rod, and the cutter head is embedded in the cross-shaped groove and fixedly connected with the drill rod in a welding manner; the four cutting edges are uniformly distributed on the drill rod at intervals, and the cutting edges protrude out of the outer peripheral surface of the drill rod. The end part of the drill rod is an arc surface or a hemispherical surface which is retracted inwards, so that the installation and subsequent processing of the tool bit are facilitated, and chip removal in use is also facilitated.

In the drill bit, the peripheral surface of the drill rod is provided with a spiral chip removal groove, and the chip removal groove extends to the middle part of the drill rod from one end of the drill rod, which is fixedly provided with the tool bit. The chip grooves are single-row grooves or double-row grooves.

In the drill bit, the drill rod comprises a cylindrical section and a hexagonal surface section, the chip removal groove is located on the cylindrical section, and the joint of the cylindrical section and the hexagonal surface section is in transition connection with a conical surface.

In the drill bit, the diameter of the cylindrical section is 4-5 mm, and the outer diameter of the hexagonal section is 6-6.5 mm; the hexagonal face section is also provided with two necking parts which are arranged at intervals, the necking parts are concave arc-shaped surfaces, and the heads of the hexagonal bolts are formed between the two necking parts. Further, the cross section of the hexagonal section is a regular hexagon, the diameter of the cylindrical section is preferably 4.5mm, and the outer diameter of the hexagonal section is preferably 6.35 mm.

In the drill, the height of the cutter head is 7-9 mm, and the length of the vertical section of the cutting edge is 4-6 mm; the length of the cylindrical section is 40 mm-60 mm, and the outer diameter of the hexagonal section is 30 mm-50 mm; the thickness of the head of the hexagonal bolt is 0.5 mm-1.5 mm. Further, the height of the cutter head is preferably 8mm, and the length of the vertical section of the cutting edge is preferably 5 mm; the length of the cylindrical section is preferably 50mm, and the outer diameter of the hexagonal section is preferably 40 mm; the thickness of the head of the hexagonal bolt is preferably 1 mm.

Compared with the prior art, the cutting edge comprises a vertical section and an inclined section, wherein the vertical section is a part close to a drill rod, and the inclined section is a part forming a tool nose. Meanwhile, an inclined cutting edge surface I is arranged on the outer side surface of the vertical section, and an inclined cutting edge surface II is arranged on the outer side surface of the inclined section; through the contrast of actual production experiment data, cutting efficiency has obtained promoting by a wide margin, and the cutting edge is difficult to damage.

Drawings

Fig. 1 is a schematic perspective view of the drill bit.

Fig. 2 is a schematic perspective view of a cutter head of the drill bit.

Fig. 3 is a schematic bottom view of the bit of the present drill.

In the figure, 1, a drill rod; 11. a chip groove; 12. a cylindrical section; 13. a hexagonal surface section; 13a, a necking part; 13b, hexagonal bolt head; 2. a cutter head; 21. a cutting edge; 21a, a vertical section; 21b, an inclined section; 22. a knife tip; 23. a first blade surface; 24. a second blade surface; 25. a third blade surface; 26. and the knife edge surface is four.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The common drill in the prior art usually has two or four cutting edges 21 which are arranged oppositely, the cutting edges 21 are arc-shaped and are directly converged to a point to form a tool nose 22, and the cutting efficiency is low; the structure of the drill bit is optimized and improved in the embodiment, and the drill bit is suitable for drill bits with more than two cutting edges 21. As shown in fig. 1 to 3, the drill comprises a drill rod 1 and a cutter head 2, wherein the cutter head 2 is fixedly arranged at one end of the drill rod 1, the cutter head 2 is provided with at least two cutting edges 21, all the cutting edges 21 are uniformly distributed at intervals along the circumferential direction of the cutter head 2, each cutting edge 21 comprises a vertical section 21a and an inclined section 21b, the length direction of the vertical section 21a is consistent with the axial direction of the drill rod 1, the inclined section 21b obliquely extends from one end of the vertical section 21a to the central line direction of the cutter head 2, and the inclined sections 21b of all the cutting edges 21 are converged at the central line of the cutter head 2 to form a cutter point 22; the outer side surface of the vertical section 21a is provided with a first inclined cutting edge surface 23, and the outer side surface of the inclined section 21b is provided with a second inclined cutting edge surface 24. All the first blade surfaces 23 and the second blade surfaces 24 are inclined in the same anticlockwise or clockwise direction; the cutting edge 21 is also provided with an edge surface three 25 extending from the side surface of the cutting edge 21 to the edge surface two 24 side; on the opposite side of the cutting edge 21 there is also a fourth edge surface 26 extending from the side of the cutting edge 21 to the other side of the second edge surface 24. Specifically, the present embodiment is modified such that each cutting edge 21 includes a vertical section 21a and an inclined section 21b, the vertical section 21a being a portion adjacent to the drill rod 1, and the inclined section 21b being a portion forming the nose 22. Meanwhile, a first inclined cutting edge surface 23 is arranged on the outer side surface of the vertical section 21a, and a second inclined cutting edge surface 24 is arranged on the outer side surface of the inclined section 21 b; through the contrast of actual production experimental data, cutting efficiency has been promoted by a wide margin, and cutting edge 21 is difficult to damage.

As shown in fig. 2 and 3, in the present embodiment, the drill rod 1 and the tool bit 2 are coaxially arranged, and an included angle α formed by a straight line where the inclined section 21b is located and a straight line where the vertical section 21a is located is 60 ° to 85 °; the included angle beta between the first edge surface 23 on the cutting edge 21 and the tangent plane of the drill rod 1 at the joint of the cutting edge 21 and the drill rod 1 is 15-30 degrees. Preferably, α is 70 ° and β is preferably 20 °. Through further improvement, the angle data are optimized, so that the cutting efficiency is further improved.

Preferably, as shown in fig. 1 and 2, the number of the cutting edges 21 is four in the present embodiment, and the cutting head 2 is cross-shaped; the end part of the drill rod 1 is provided with a cross groove, and the tool bit 2 is embedded in the cross groove and is fixedly connected with the drill rod 1 in a welding way; the four cutting edges 21 are uniformly distributed on the drill rod 1 at intervals, and the cutting edges 21 protrude out of the peripheral surface of the drill rod 1; the end part of the drill rod 1 is an arc surface or a hemispherical surface which is retracted inwards, so that the installation and subsequent processing of the tool bit 2 are facilitated, and chip removal in use is also facilitated. The peripheral surface of the drill rod 1 is provided with a spiral chip groove 11, and the chip groove 11 extends to the middle part of the drill rod 1 from one end of the drill rod 1 fixedly provided with the tool bit 2. The chip grooves 11 are single-row grooves or double-row grooves.

As shown in figure 1, the drill rod 1 comprises a cylindrical section 12 and a hexagonal section 13, the chip grooves 11 are located on the cylindrical section 12, and the joint of the cylindrical section 12 and the hexagonal section 13 is in conical surface transition connection.

In the embodiment, the diameter of the cylindrical section 12 is 4 mm-5 mm, and the outer diameter of the hexagonal section 13 is 6 mm-6.5 mm; the hexagonal surface section 13 is also provided with two necking parts 13a which are arranged at intervals, the necking parts 13a are concave arc surfaces, and a hexagonal bolt head part 13b is formed between the two necking parts 13 a; the height of the cutter head 2 is 7 mm-9 mm, and the length of the vertical section 21a of the cutting edge 21 is 4 mm-6 mm; the length of the cylindrical section 12 is 40 mm-60 mm, and the outer diameter of the hexagonal section 13 is 30 mm-50 mm; the thickness of the hexagonal bolt head 13b is 0.5 mm-1.5 mm; further, the cross section of the hexagonal section 13 is a regular hexagon, the diameter of the cylindrical section 12 is preferably 4.5mm, and the outer diameter of the hexagonal section 13 is preferably 6.35 mm; the height of the cutting head 2 is preferably 8mm, and the length of the vertical section 21a of the cutting edge 21 is preferably 5 mm; the length of the cylindrical section 12 is preferably 50mm, and the outer diameter of the hexagonal section 13 is preferably 40 mm; the thickness of the hexagonal bolt head 13b is preferably 1 mm.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although 1, drill pipe is used more herein; 11. a chip groove; 12. a cylindrical section; 13. a hexagonal surface section; 13a, a necking part; 13b, hexagonal bolt head; 2. a cutter head; 21. a cutting edge; 21a, a vertical section; 21b, an inclined section; 22. a knife tip; 23. a first blade surface; 24. a second blade surface; 25. a third blade surface; 26. blade face four, but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A drill bit comprises a drill rod (1) and a cutter head (2), wherein the cutter head (2) is fixedly arranged at one end of the drill rod (1), the drill bit is characterized in that the cutter head (2) is provided with at least two cutting edges (21), all the cutting edges (21) are uniformly distributed at intervals along the circumferential direction of the cutter head (2), each cutting edge (21) comprises a vertical section (21a) and an inclined section (21b), the length direction of the vertical section (21a) is consistent with the axial direction of the drill rod (1), the inclined section (21b) obliquely extends from one end of the vertical section (21a) to the central line direction of the cutter head (2), and the inclined sections (21b) of all the cutting edges (21) form a cutter point (22) after being converged at the central line of the cutter head (2); the outer side surface of the vertical section (21a) is provided with a first inclined cutting edge surface (23), and the outer side surface of the inclined section (21b) is provided with a second inclined cutting edge surface (24).

2. Drill bit according to claim 1, characterized in that the drill rod (1) and the cutter head (2) are arranged coaxially, and the straight line of the inclined section (21b) and the straight line of the vertical section (21a) form an angle α of 60 ° to 85 °.

3. Drill bit according to claim 2, characterized in that the angle β between the first cutting edge surface (23) of the cutting edge (21) and the tangent plane of the drill rod (1) at the connection of the cutting edge (21) with the drill rod (1) is 15 ° to 30 °.

4. The drill bit according to claim 3, wherein all of the first cutting edge face (23) and the second cutting edge face (24) are inclined in the same direction, counterclockwise or clockwise; the cutting edge (21) is also provided with an edge surface III (25) extending from the side surface of the cutting edge (21) to the edge surface II (24); the other side opposite to the cutting edge (21) is also provided with an edge surface four (26) extending from the side of the cutting edge (21) to the other side of the edge surface two (24).

5. Drill according to claim 1 or 2 or 3 or 4, characterized in that the number of cutting edges (21) is four and that the cutting head (2) is cross-shaped.

6. The drill bit as claimed in claim 5, wherein a cross groove is formed at the end of the drill rod (1), and the cutter head (2) is embedded in the cross groove and fixedly connected with the drill rod (1) in a welding manner; the four cutting edges (21) are uniformly distributed on the drill rod (1) at intervals, and the cutting edges (21) protrude out of the outer peripheral surface of the drill rod (1).

7. The drill bit as claimed in claim 6, characterized in that the drill rod (1) is provided with a spiral chip groove (11) on the outer circumferential surface, and the chip groove (11) extends from one end of the drill rod (1) where the cutter head (2) is fixed to the middle of the drill rod (1).

8. The drill bit according to claim 7, characterized in that the drill rod (1) comprises a cylindrical section (12) and a hexagonal section (13), the chip grooves (11) are arranged on the cylindrical section (12), and the joint of the cylindrical section (12) and the hexagonal section (13) is in conical surface transition joint.

9. The drill bit according to claim 8, characterized in that the diameter of the cylindrical section (12) is 4mm to 5mm, and the outer diameter of the hexagonal section (13) is 6mm to 6.5 mm; the hexagonal section (13) is further provided with two necking parts (13a) arranged at intervals, the necking parts (13a) are concave arc-shaped surfaces, and a hexagonal bolt head (13b) is formed between the two necking parts (13 a).

10. The drill according to claim 9, characterized in that the height of the cutting head (2) is 7-9 mm, and the length of the vertical section (21a) of the cutting edge (21) is 4-6 mm; the length of the cylindrical section (12) is 40-60 mm, and the outer diameter of the hexagonal section (13) is 30-50 mm; the thickness of the hexagonal bolt head (13b) is 0.5-1.5 mm.