CN215966496U

CN215966496U - Aramid drill bit

Info

Publication number: CN215966496U
Application number: CN202122035118.6U
Authority: CN
Inventors: 成勇; 吕涛; 程谟力; 龙重旺; 黄文亮
Original assignee: Blue Whale Technology Shenzhen Co ltd
Current assignee: Blue Whale Technology Shenzhen Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2022-03-08
Anticipated expiration: 2031-08-26

Abstract

The utility model relates to the technical field of drilling tools, and discloses an aramid fiber drill bit, which comprises: a handle; a drill rod disposed at one end of the shank; the groove is formed in the surface of the drill rod; the outer cutting edge is arranged on the edge of one end, far away from the handle, of the drill rod, the vertex angle of the outer cutting edge is 55-60 degrees, the back angle of the outer cutting edge is 10-15 degrees, and the front angle of the outer cutting edge is 15-20 degrees. One end through the drilling rod is equipped with outer sword that cuts, and outer sword plays the cutting action, and then provides an aramid fiber drill bit, conveniently gets rid of the material from hole edge to hole center gradually, can improve the processingquality to AFRP system hole.

Description

Aramid drill bit

Technical Field

The utility model relates to the technical field of drilling tools, in particular to a drill bit special for aramid fiber materials.

Background

The AFRP takes resin as a matrix, and the resin plays a role in fixing the aramid fiber in the composite material. Compared with aramid fibers, resin materials are more brittle, have inferior tensile and compression properties than aramid fibers, and are not used as the main load-bearing material in the overall composite material. The resin matrix is an isotropic material, and when the resin matrix and aramid fibers form a composite material, the composite material formed by orderly combining two different materials is an anisotropic material. The AFRP is generally formed by laying aramid fiber and resin layers in each layer, and the laid aramid fiber composite material is shown in fig. 5. The AFRP can be classified into unidirectional fiber composites and multidirectional fiber composites according to the direction of each layer of aramid fibers. The unidirectional composite material refers to that the directions of aramid fibers of each layer of the layered composite material are consistent, and the multidirectional fiber composite material refers to that the fiber yarns of each layer have more than one laying direction. The laminated AFRP has multidirectional anisotropy due to the structural characteristics, and has excellent mechanical property and mechanical property due to the super-strong characteristics of aramid fibers.

In the aerospace field, the aramid fiber and the resin composite material thereof can be used for manufacturing secondary structural materials of large airplanes, such as fairings, wings, emergency exit system components, partition plates, bulkheads and the like, and the aramid fiber composite material can reduce the self weight of the airplane by about 30 percent. The aramid fiber composite material can also be applied to the shells of rocket solid engines and strategic missile engines, and parts such as the fuselage, the main wing, the rear wing and the like of advanced spacecrafts. Meanwhile, the excellent high-low temperature performance and the impact resistance of the high-performance aramid fiber can be used as the main material of the extravehicular space suit.

In the prior art, as shown in fig. 6, a twist drill is a tool for drilling a circular hole of a workpiece by rotary cutting thereof with respect to a fixed axis. The flute is spiral and shaped like twist. In mechanical assembly, due to the need for workpiece-to-workpiece connection, the machining of holes is one of the most important machining methods in the secondary machining of AFRP. When using a conventional tool (twist drill) to make holes in an AFRP, due to the special properties of the material, for example: anisotropy, high strength, high toughness, small heat conductivity coefficient and the like, so that the mechanical processing performance of the material is poor, various quality damages often occur when drilling is carried out, and the main form is as follows: burrs at the exit and entrance of the hole, delamination and tearing near the hole, burning of the hole walls and the edges of the hole, etc. In the aerospace field, when a structure prepared from aramid fiber materials is processed, due to the fact that the requirement on the size of a drilled hole is extremely high, the efficiency is low when the traditional drilling tool is used for drilling, the processing precision is difficult to guarantee, the structural performance and the service life of an aerospace structural part are seriously affected by the quality damage, and if the connecting part is in a problem, serious casualties of aerospace vehicles and personnel can be caused.

Therefore, how to provide a high-efficiency special drill bit for aramid fiber to improve the processing quality of AFRP hole making becomes a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a high-efficiency special drill bit for aramid fiber so as to improve the processing quality of AFRP hole making.

To this end, according to a first aspect, an embodiment of the present invention discloses an aramid drill bit, including:

a handle;

a drill rod disposed at one end of the shank;

the groove is formed in the surface of the drill rod;

the outer cutting edge is arranged on the edge of one end of the drill rod far away from the handle part, and the vertex angle phi of the outer cutting edge₁Is 55-60 degrees, and the back angle alpha of the external cutting edge₁Is 10-15 degrees, and the front angle gamma of the external cutting edge₁Is 15 to 20 degrees.

The utility model is further configured to further include: the inner cutting edge is arranged in the middle of one end, far away from the handle, of the drill rod, and the vertex angle phi of the inner cutting edge₂Is 50 to 70 degrees, and is internally cutThe rake angle gamma 2 of the edge is 8-12 DEG, and the relief angle alpha of the inner cutting edge₂Is 10 to 14 degrees.

The drill rod is further provided with the grooves which are spirally formed in the drill rod, and the spiral angle of each groove is 15-20 degrees.

The utility model is further provided that the number of the inner cutting edges is one, the number of the outer cutting edges is two, the height of the inner cutting edges is higher than that of the outer cutting edges, the two outer cutting edges are positioned at two sides of the inner cutting edges, and the inner cutting edges and the two outer cutting edges form a three-point two-edge structure.

The utility model is further arranged that the two outer cutting edges are symmetrically distributed on two sides of the inner cutting edge, and the height difference between the inner cutting edge and the two outer cutting edges is the same.

The utility model is further arranged that the handle part and the drill rod are integrally formed, the drill bit is made of hard alloy materials, and the hard alloy is formed by pressurizing and sintering tungsten carbide powder serving as a matrix and cobalt powder serving as a binder. Because of its high hardness, very wear-resisting and certain strength, it is suitable for making cutting tool by high-speed cutting.

The utility model is further provided that the edge of the inner cutting edge is provided with a chip groove for conveniently discharging the processing chips, and the chip groove is arranged in an arc shape.

The utility model has the following beneficial effects: the utility model provides a drill bit special for aramid fiber, wherein an outer cutting edge is arranged at one end of a drill rod and plays the most key role in cutting, the cutting mode of the traditional drill bit is changed, materials are gradually removed from the edge of a hole to the center of the hole according to the characteristics of aramid fiber materials, and the outer cutting edge with specific parameters is utilized and is subjected to matching adjustment and optimization of the vertex angle, the relief angle and the front angle of the outer cutting edge; the cutting speed and the cutting efficiency can be improved to the greatest extent, the processing quality of AFRP hole making is improved, the processing requirement of the aramid fiber material structure can be efficiently met, the processing size precision is stable, the efficiency is higher, and the processing cost of aerospace vehicle structural parts is greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of an aramid drill bit disclosed in this embodiment;

FIG. 2 is a partial structural schematic view of a drill rod in an aramid drill bit disclosed in the present embodiment;

fig. 3 is a schematic perspective view of a second aramid drill bit disclosed in this embodiment;

FIG. 4 is a partial structural schematic view of a drill rod in a second aramid drill bit disclosed in the present embodiment;

FIG. 5 is a schematic diagram of the structure of AFRP;

fig. 6 is a schematic structural view of a conventional twist drill.

Reference numerals: 1. a handle; 2. a drill stem; 21. an inner cutting edge; 22. an outer cutting edge; 23. a trench; 24. a chip groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

First embodiment

The embodiment discloses an aramid drill bit, as shown in fig. 1 and 2, including: the handle part 1, the drill rod 2, the groove 23 and the external cutting edge 22; the drill rod 2 is arranged at one end of the handle part 1; the groove 23 is formed on the surface of the drill rod 2; an outer cutting edge 22 is arranged at the edge of the end of the drill rod 2 remote from the shank 1, the top angle of the outer cutting edge 22

Is 55-60 DEG, and the clearance angle alpha of the outer cutting edge 22₁10 to 15 DEG, and a rake angle gamma of the outer cutting edge 22₁Is 15 to 20 degrees.

As shown in FIGS. 1-2, the grooves 23 are spirally formed on the drill rod 2, and the helix angle of the grooves is 15-20 °.

The working principle is as follows: one end of the drill rod 2 is provided with an outer cutting edge 22, the outer cutting edge 22 plays a cutting role, and therefore the aramid fiber drill bit is provided, materials are conveniently and gradually removed from the edge of a hole to the center of the hole, and the processing quality of AFRP hole making can be improved.

Second embodiment

At 60 deg. and a clearance angle alpha of the outer cutting edge 22₁At 10 deg., the rake angle gamma of the outer cutting edge 22₁Is 15 deg..

Third embodiment:

the embodiment discloses an aramid drill bit, as shown in fig. 3 and 4, including: the handle part 1, the drill rod 2, the groove 23 and the external cutting edge 22; the drill rod 2 is arranged at one end of the handle part 1; the groove 23 is formed on the surface of the drill rod 2; an outer cutting edge 22 is arranged at the edge of the end of the drill rod 2 remote from the shank 1, the top angle of the outer cutting edge 22

Is 55-60 DEG, and the clearance angle alpha of the outer cutting edge 22₁10 to 15 DEG, and a rake angle gamma of the outer cutting edge 22₁Is 15 ~ 20 °, still includes: an inner cutting edge 21, wherein the inner cutting edge 21 is arranged in the middle of one end of the drill rod 2 far away from the handle 1, and the vertex angle of the inner cutting edge 21

Is 50-70 degrees, and the front angle gamma of the inner cutting edge 21₂Is 8-12 degrees and the relief angle alpha of the inner cutting edge 21₂Is 10 to 14 degrees.

As shown in fig. 3 to 4, the grooves 23 are spirally formed on the drill rod 2, and the helix angle of the grooves is 15 to 20 °.

The working principle is as follows: one end of the drill rod 2 is provided with the outer cutting edge 22, the outer cutting edge 22 and the inner cutting edge 21 play a cutting role, the outer cutting edge 22 plays a most critical cutting role, the inner cutting edge 21 is matched with the outer cutting edge 22 to cut, materials are conveniently and gradually removed from the edge of the hole to the center of the hole, and the processing quality of AFRP hole making can be improved.

Fourth embodiment:

Is 50 DEG, and the rake angle gamma of the inner cutting edge 21₂Is 12 degrees and the relief angle alpha of the inner cutting edge 21₂Is 14 deg..

Fifth embodiment:

the present embodiment discloses an aramid drill, which has the same features as the fourth embodiment, and in which the number of the inner cutting edges 21 is one, the number of the outer cutting edges 22 is set to two, the height of the inner cutting edges 21 is higher than that of the outer cutting edges 22, the two outer cutting edges 22 are located on both sides of the inner cutting edges 21, and the inner cutting edges 21 and the two outer cutting edges 22 form a "three-point two-edge" structure.

As shown in fig. 3 to 4, the two outer cutting edges 22 are symmetrically distributed on both sides of the inner cutting edge, and the height difference between the inner cutting edge 21 and the two outer cutting edges 22 is the same.

As shown in fig. 3 to 4, the shank 1 and the drill rod 2 are integrally formed.

As shown in fig. 3 to 4, a chip discharge groove 24 for facilitating discharge of machining chips is formed on the edge of the inner cutting edge 21, and the chip discharge groove 24 is arc-shaped.

The working principle is as follows: the outer cutting edge 22 is arranged at one end of the drill rod 2, the outer cutting edge 22 and the inner cutting edge 21 play a cutting role, the inner cutting edge 21 and the two outer cutting edges 22 form a three-point two-edge structure, and the three-point two-edge regular structure can play a role in quickly removing materials from the outside to the inside of the outer cutting edges, and simultaneously, the auxiliary cutting of the inner cutting edge is utilized, so that the cutting efficiency is optimized, and the cutting efficiency can be greatly improved compared with that of the traditional cutting tool; further, the aramid fiber drill bit is convenient to gradually remove materials from the edge of the hole to the center of the hole, and the processing quality of AFRP hole making can be improved.

The following table is a comparison of the cutting effect of a standard twist drill and various embodiments of the present invention:

it should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. An aramid drill bit, comprising:

a handle (1);

a drill rod (2), the drill rod (2) being arranged at one end of the shank (1);

the groove (23) is formed in the surface of the drill rod (2);

the outer cutting edge (22), the outer cutting edge (22) is arranged on the edge of one end of the drill rod (2) far away from the handle part (1), and the vertex angle of the outer cutting edge (22)

Is 55-60 DEG, and the clearance angle (alpha) of the outer cutting edge (22)₁) 10 to 15 DEG, and the rake angle (gamma) of the outer cutting edge (22)₁) Is 15 to 20 degrees.

2. The aramid drill bit of claim 1, further comprising:

the drill rod comprises an inner cutting edge (21), the inner cutting edge (21) is arranged in the middle of one end, far away from the handle part (1), of the drill rod (2), and the vertex angle of the inner cutting edge (21)

Is 50-70 degrees, and the rake angle (gamma) of the inner cutting edge (21)₂) Is 8 to 12 DEG, and a clearance angle (alpha) of the inner cutting edge (21)₂) Is 10 to 14 degrees.

3. The aramid drill bit according to claim 1 or 2, characterized in that the grooves (23) are helically cut in the drill rod (2) with a helix angle of 15-20 °.

4. The aramid drill bit as claimed in claim 2, characterized in that the number of the inner cutting edges (21) is one, the number of the outer cutting edges (22) is two, the height of the inner cutting edges (21) is higher than that of the outer cutting edges (22), the two outer cutting edges (22) are positioned on two sides of the inner cutting edges (21), and the inner cutting edges (21) and the two outer cutting edges (22) form a three-point two-edge structure.

5. The aramid drill bit as claimed in claim 4, characterized in that the two outer cutting edges (22) are symmetrically distributed on both sides of the inner cutting edge (21), and the height difference between the inner cutting edge (21) and the two outer cutting edges (22) is the same.

6. Aramid drill bit as claimed in claim 1, characterized in that the shank (1) is formed integrally with the drill rod (2).

7. The aramid drill bit as claimed in claim 2, 4 or 5, characterized in that the inner cutting edge (21) is provided with chip grooves (24) on its edge for facilitating discharge of machining chips, the chip grooves (24) being arc-shaped.