CN216634251U

CN216634251U - Three-edge drill bit and electric hammer drill

Info

Publication number: CN216634251U
Application number: CN202220239272.7U
Authority: CN
Inventors: 余少华
Original assignee: Yueqing Furong Zhongtai Tools Co ltd
Current assignee: Yueqing Furong Zhongtai Tools Co ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-05-31
Anticipated expiration: 2032-01-28

Abstract

The utility model discloses a three-edge drill bit which comprises a rod-shaped cutter body and three cutter heads arranged at the working end of the cutter body, wherein the three cutter heads radially extend and are distributed in a radioactive mode, the inner ends of the three cutter heads are intersected at the position of a central shaft, a cutting edge extending from outside to inside is arranged at the top end of each cutter head, a cutting front face is arranged on the front side of the cutting edge, a cutting back face is arranged on the rear side of the cutting edge, the cutting front faces of the cutter heads are arranged in the same direction, the cutting edges are obliquely arranged, and the inner ends of the three cutting edges are intersected at the position of the central shaft to form the peak of a tip. Through setting up three tool bit, make the aperture of drilling more mellow and full, chip removal speed is faster when just drilling, and then promotes drilling speed and work efficiency, increase of service life. The utility model also discloses an electric hammer drill comprising the three-edge drill bit.

Description

Three-edge drill bit and electric hammer drill

Technical Field

The utility model relates to the field of processing tools, in particular to a three-edge drill bit. In addition, the utility model also relates to an electric hammer drill comprising the three-edge drill bit.

Background

In the construction process, materials such as concrete, bricks, granite and the like need to be drilled, the main tool for drilling is an electric hammer drill, and the specific working mode is that a hard alloy drill bit is arranged on a machine body of the electric hammer drill, so that the drill bit rotates to complete the drilling and cutting operation.

In the prior art, the drill bit is generally a two-bit drill bit or a four-bit drill bit. However, the two cutter heads have great defects, and the diameters of the drill heads of the two cutter heads are not circular enough and are oval, so that the construction requirement cannot be met. And the four-bit drill bit has low drilling speed and low efficiency.

Therefore, how to provide a stable and efficient drill bit is a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a three-edge drill bit, which has the advantages that the hole diameter of a drilled hole is more round and smooth, the chip removal speed during drilling is higher, the drilling speed and the working efficiency are further improved, and the service life is prolonged. Another object of the present invention is to provide an electric hammer drill including the above three-bladed drill bit.

In order to solve the technical problem, the utility model provides a three-edge drill bit which comprises a rod-shaped cutter body and three cutter heads arranged at the working end of the cutter body, wherein the three cutter heads radially extend to form a radioactive distribution, the inner ends of the three cutter heads meet at the position of a central shaft, the top end of each cutter head is provided with a cutting edge extending from outside to inside, the front side of each cutting edge is provided with a cutting front face, the rear side of each cutting edge is provided with a cutting back face, the cutting front faces of the cutter heads are arranged in the same direction, the cutting edges are obliquely arranged, and the inner ends of the three cutting edges meet at the position of the central shaft to form a peak of a tip.

Preferably, the three cutter heads are the same in size, and the included angle between the cutter heads is 120 degrees.

Preferably, the lower edge of the cutting front surface of one of the cutter heads extends to the cutting edge of the other adjacent cutter head, a connection point is formed on the cutting edge near the vertex, the connection point divides the cutting edge into an inner section and an outer section, and an included angle between the inner section and the outer section is an obtuse angle.

Preferably, the included angle between the inner section and the outer section ranges from 160 degrees to 180 degrees, and the included angle between the cutting edge and the central axis ranges from 70 degrees to 80 degrees.

Preferably, the width ratio of the cutting front surface to the cutting back surface is 1:2, and the distance between the vertex and the connection point ranges from 1 to 10 mm.

Preferably, the periphery of the cutter body is provided with three spiral edges which are respectively butted with the three cutter heads.

Preferably, the working end of cutter body is provided with the trident type draw-in groove, and three the tool bit card is gone into in the trident type draw-in groove.

Preferably, the cutting back surface is provided with a chip groove, a front end opening of the chip groove is located on the cutting edge, and a rear end opening of the chip groove is located on the lower edge of the cutting back surface.

Preferably, the two side edges of the opening at the rear end of the chip groove are provided with auxiliary grooves, the chip groove and the auxiliary grooves are U-shaped grooves, and the depth and the length of the chip groove are both larger than those of the auxiliary grooves.

The utility model provides an electric hammer drill which comprises a machine body and a three-edge drill bit arranged on the machine body, wherein the three-edge drill bit is specifically any one of the three-edge drill bits.

The utility model provides a three-edge drill bit which comprises a rod-shaped cutter body and three cutter heads arranged at the working end of the cutter body, wherein the three cutter heads radially extend and are distributed in a radioactive mode, the inner ends of the three cutter heads are intersected at the position of a central shaft, a cutting edge extending from outside to inside is arranged at the top end of each cutter head, a cutting front face is arranged on the front side of the cutting edge, a cutting back face is arranged on the rear side of the cutting edge, the cutting front faces of the cutter heads are arranged in the same direction, the cutting edges are obliquely arranged, and the inner ends of the three cutting edges are intersected at the position of the central shaft to form the peak of a tip. Through setting up three tool bit, make the aperture of drilling more mellow and full, chip removal speed is faster when just drilling, and then promotes drilling speed and work efficiency, increase of service life.

The utility model also provides an electric hammer drill comprising the three-edge drill bit, and the electric hammer drill also has the same technical effects due to the technical effects of the three-edge drill bit, and the details are not described herein.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a three-bladed drill bit according to the present invention;

FIG. 2 is a front view of a cutter head of one embodiment of a three-bladed drill bit according to the present invention;

FIG. 3 is a side view of a cutter head of one embodiment of a three-bladed drill bit according to the present invention;

FIG. 4 is a top view of a cutter head of one embodiment of a three-bladed drill bit according to the present invention;

fig. 5 is a schematic installation diagram of one embodiment of a three-bladed drill bit according to the present invention.

Detailed Description

The core of the utility model is to provide the three-edge drill bit, the three tool bits are arranged, so that the hole diameter of the drilled hole is more smooth, the chip removal speed during drilling is higher, the drilling speed and the working efficiency are further improved, and the service life is prolonged. Another core of the utility model is to provide an electric hammer drill comprising the three-edge drill bit.

In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of a three-edge drill according to an embodiment of the present invention; FIG. 2 is a front view of a cutter head of one embodiment of a three-bladed drill bit according to the present invention; FIG. 3 is a side view of a cutter head of one embodiment of a three-bladed drill bit according to the present invention; FIG. 4 is a top view of a cutter head of one embodiment of a three-bladed drill bit according to the present invention; fig. 5 is a schematic installation diagram of one embodiment of a three-bladed drill bit according to the present invention.

The utility model provides a three-edge drill bit, which comprises a rod-shaped cutter body 7 and three cutter heads 1, wherein the connecting end of the cutter body 7 is used for connecting a machine body of an electric hammer drill, the working end of the cutter body 7 is provided with the three cutter heads 1, the three cutter heads 1 radially extend and are distributed in a radial mode, the inner ends of the three cutter heads 1 are close to each other and intersect at a middle shaft position, the outer ends of the three cutter heads 1 extend outwards from the center, so that the three cutter heads 1 form a three-fork structure, the top end of each cutter head 1 is provided with a cutting edge 2 extending from outside to inside, the front side of the cutting edge 2 is provided with a cutting front surface 3, the rear side of the cutting edge 2 is provided with a cutting back surface 4, the cutting front surfaces 3 of the cutter heads 1 are arranged in the same direction, namely the front side and the rear side are defined according to the advancing direction of the cutter head 1 in the rotating process, each cutting front surface 3 is positioned at the front side of the cutter head 1, so that the cutting operation can be kept during the rotating process, meanwhile, the cutting edges 2 are obliquely arranged to form a conical structure, and the inner ends of the three cutting edges 2 are intersected at the middle axis position to form a vertex P of the tip of the conical structure.

Through setting up three tool bit 2, make the aperture of drilling more mellow and full, the chip removal speed is faster when just drilling, and then promotes drilling speed and work efficiency, increase of service life.

Further, the three tool bits 1 have the same size, and the included angle between each tool bit 1 is 120 degrees, so that the concentricity during drilling is ensured. The vertex P is not easy to break, the working resistance is reduced, the alloy cutter head is more wear-resistant, and the service life of the alloy cutter head is prolonged.

Specifically, the lower edge of the cutting front face 3 of the first cutting head continues to extend, a ridge line is formed on the cutting back face 4 of the second cutting head until the cutting edge 2 of the second cutting head is extended, a connection point C is formed on the cutting edge 2 near the vertex P, and the connection points C are formed on the second cutting head and the third cutting head as well as the third cutting head and the first cutting head in the same manner, that is, each cutting edge 2 is provided with the connection point C, and a triangular pyramid structure is formed by three planar quadrangles when viewed from the top. The connecting point C makes the cutting edge 2 separate for interior section and outer section, and the connecting point C is sunken downwards a little, makes to form contained angle alpha between interior section and the outer section, and contained angle alpha is the obtuse angle for the location is more accurate among the drilling process, is difficult to the aversion, and the angle range can be 160 degrees to 180 degrees. Further, the angle between the cutting edge 2 and the central axis is 70 to 80 degrees, or the size and angle of each component are adjusted according to the situation, which is within the protection scope of the present invention.

Preferably, the ratio of the width of the cutting front face 3 to the cutting back face 4 is 1:2, and the distance between the vertex P and the connecting point C varies with the size of the cutting head 1, and ranges from 1 to 10 mm.

In the three-edged drill provided by the embodiment of the utility model, the outer periphery of the cutter body 7 is provided with three spiral edges which are respectively butted with the three cutter heads 1 to form a three-thread structure, so that smooth cutting is realized. The working end of cutter body 7 is provided with trident type draw-in groove, and in the trident type draw-in groove was gone into to three tool bit 1 card of integral type shaping, the welding was in the same place, and stable in structure is firm.

On the basis of the three-edge drill provided by the above embodiments, the cutting back surface 4 is provided with the chip discharge groove 5, the front end opening of the chip discharge groove 5 is located at the cutting edge 2, the rear end opening of the chip discharge groove 5 is located at the lower edge of the cutting back surface 4, and chips generated in the cutting process are discharged along the chip discharge groove 5. The whole cutter head 1 can remove chips more quickly during working, so that the resistance is greatly reduced, the cutting efficiency is improved, and the service life is prolonged.

Furthermore, the auxiliary grooves 6 are arranged at two side edges of the opening at the rear end of the chip groove 5, the chip groove 5 is communicated with the auxiliary grooves 6, the extending directions of the chip groove 5 and the auxiliary grooves are the same, the width of the opening at the rear end of the chip groove 5 is enlarged equivalently, the chip groove 5 and the auxiliary grooves 6 are both U-shaped grooves, the processing is convenient, and the depth and the length of the chip groove 5 are both larger than those of the auxiliary grooves 6.

In addition to the three-edged drill, the present invention further provides an electric hammer drill including the three-edged drill, and the structure of other parts of the electric hammer drill is referred to the prior art and is not described herein again.

The three-edge drill bit and the electric hammer drill provided by the utility model are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The three-edge drill bit is characterized by comprising a rod-shaped cutter body (7) and three cutter heads (1) arranged at the working end of the cutter body (7), wherein the three cutter heads (1) radially extend to be distributed radially, the inner ends of the three cutter heads (1) meet at the position of a central axis, the top end of each cutter head (1) is provided with a cutting edge (2) extending from outside to inside, the front side of each cutting edge (2) is provided with a cutting front surface (3), the rear side of each cutting edge (2) is provided with a cutting back surface (4), the cutting front surfaces (3) of the cutter heads (1) are arranged in the same direction, the cutting edges (2) are obliquely arranged, and the inner ends of the three cutting edges (2) meet at the position of the central axis to form a peak (P) of a tip.

2. A three-edged drill according to claim 1, characterized in that the three cutting bits (1) are of the same size and that the included angle between the cutting bits (1) is 120 degrees.

3. A three-edged drill according to claim 1, characterized in that the lower edge of the cutting front face (3) of one cutting head (1) extends to the cutting edge (2) of the adjacent other cutting head (1), a connection point (C) being formed on the cutting edge (2) near the apex (P), which connection point (C) divides the cutting edge (2) into an inner section and an outer section, the included angle between the inner section and the outer section being an obtuse angle.

4. A three-edged drill according to claim 3, characterized in that the angle between the inner section and the outer section is in the range of 160 to 180 degrees and the angle between the cutting edge (2) and the central axis is in the range of 70 to 80 degrees.

5. A three-edged drill according to claim 4, characterized in that the ratio of the width of the front cutting face (3) to the rear cutting face (4) is 1:2 and the distance of the apex (P) from the connecting point (C) is in the range from 1 to 10 mm.

6. A three-edged drill according to claim 1, characterized in that the cutter body (7) is provided at its outer periphery with three helical edges abutting against three of the cutter bits (1), respectively.

7. A three-edged drill bit as claimed in claim 6, characterized in that the working end of the cutter body (7) is provided with a three-pronged bayonet slot into which three of the cutting bits (1) are snapped.

8. A three-edged drill according to any one of claims 1 to 7, characterized in that the cutting back (4) is provided with chip flutes (5), the front end openings of the chip flutes (5) being located at the cutting edges (2) and the rear end openings of the chip flutes (5) being located at the lower edge of the cutting back (4).

9. A three-edge drill bit as claimed in claim 8, characterized in that auxiliary grooves (6) are arranged at two sides of the rear end opening of the chip discharge groove (5), the chip discharge groove (5) and the auxiliary grooves (6) are U-shaped grooves, and the depth and the length of the chip discharge groove (5) are both greater than those of the auxiliary grooves (6).

10. An electric hammer drill comprising a body and a three-edged drill mounted to the body, in particular a three-edged drill as claimed in any one of claims 1 to 9.