CN220311860U - Sword tooth bores drill bit and cutting drill - Google Patents

Abstract

The utility model provides a sword tooth drill bit and a cutting drill, which belong to the technical field of machining tools and comprise: one end of the drill body is provided with a toothed first limiting part, and the other end of the drill bit is provided with a cutting end; the cutting face comprises two spiral faces, the two spiral faces are arranged at the cutting end, the two cutting faces are intersected at the central part of the cutting end to form a convex cutting part, and the cutting part is located at the highest position of the cutting face; the angle of the middle part of the cutting part after being cut is 80-100 degrees. The utility model has the beneficial effects that: the spiral surface shape and the convex cutting part of the sword tooth drill bit enable the negative rake angle of the center part of the cutting end to be small in actual processing, and the small negative rake angle means that the processing can be performed without large extrusion force towards the direction of a workpiece, so that the heat release amount is greatly reduced, and the working efficiency is greatly improved.

Description

Sword tooth bores drill bit and cutting drill

Technical Field

The utility model belongs to the technical field of machining tools, and particularly relates to a sword tooth drill bit and a cutting drill.

Background

A drill bit is a very popular tool that can be used on a drill or a pistol drill.

For example, chinese patent application No. 202111025957.8 discloses a drill rod that is easy to replace and install, comprising a double-edged cutter bar and a cutter handle; one end of the knife handle is integrally formed with a double-edge knife bar; the other end of the double-edge cutter bar is integrally formed with a drill bit of an adapter part, and the drill bit is detachably connected to the end part of the adapter part by a screw; and the joint of the drill bit and the switching part is arranged in a clearance way.

The cutting face of the cutting end of the cutting drill in the prior art is in a straight face shape, the center part of the cutting end of the cutting drill in the shape has a large negative rake angle in machining, the large negative rake angle means that the large extrusion force towards the workpiece direction is required in actual machining, the large extrusion force can cause large heating value, and the large heating value can greatly influence the machining efficiency by stopping working to dissipate heat.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides a sword tooth drill bit and a cutting drill.

The aim of the utility model can be achieved by the following technical scheme: a sword-tooth drill bit, comprising:

one end of the drill body is provided with a toothed first limiting part, and the other end of the drill bit is provided with a cutting end;

the cutting face comprises two spiral faces, the two spiral faces are arranged at the cutting end, the two cutting faces are intersected at the central part of the cutting end to form a convex cutting part, and the cutting part is located at the highest position of the cutting face;

the angle of the middle part of the cutting part after being cut is 80-100 degrees.

Preferably, the side surface of the drill body includes a first side surface and a second side surface, and the first side surface and the second side surface are both provided with a supporting portion for supporting when cutting the hole, and the supporting portion protrudes from the first side surface and the second side surface.

Preferably, the supporting portion includes a first protruding portion and a second protruding portion, and end portions of the first protruding portion and the second protruding portion are connected with the cutting face.

Preferably, two chip guiding grooves are arranged between the first side face and the second side face, and the chip guiding grooves are used for guiding out chips generated during cutting of the cutting face.

Preferably, two mounting holes are further formed in the drill body, and the two mounting holes penetrate through the cutting end to the first limiting portion.

Preferably, the mounting hole is provided as a counter bore.

Secondly, still provide a cutting and bore, including the sword tooth bores the drill bit as above, still include the body of rod, the body of drill with the body of rod detachable connection.

Preferably, the end part of the rod body is provided with a toothed second limiting part, and the second limiting part is meshed with the first limiting part of the drill body.

Compared with the prior art, the utility model has the beneficial effects that:

1. the spiral surface shape and the convex cutting part of the sword tooth drill bit enable the negative rake angle of the center part of the cutting end to be small in actual processing, and the small negative rake angle means that the processing can be performed without large extrusion force towards the direction of a workpiece, so that the heat release amount is greatly reduced, and the working efficiency is greatly improved.

2. The cutting surface consists of two spiral surfaces, so that the two spiral surfaces meet at the middle part of the cutting end to form a convex cutting part, and the angle of alpha of the cutting part can be controlled by controlling the size of the cambered surfaces of the two spiral surfaces.

3. When the sword tooth bores the drill bit and carries out drilling processing, the supporting part can replace first side and second side and the pore wall conflict in the hole that the processing was come out is connected, and the existence of supporting part can make the drill bit more stable when processing, can not take place to rock.

Drawings

Fig. 1 is a front view of the sword drill bit of the present utility model.

Fig. 2 is a cross-sectional view of the sword-tooth drill bit of the present utility model.

Fig. 3 is an isometric view of the sword drill bit of the present utility model.

Fig. 4 is an isometric view of the sword drill bit of the present utility model from another perspective.

Fig. 5 is an isometric view of a side view of the present utility model of a sword drill bit.

In the figure, 100, the drill body; 110. a first limit part; 120. a cutting end; 130. a first side; 140. a second side; 150. a support part; 151. a first boss; 152. a second protruding portion; 210. spiral surface; 300. a cutting portion; 400. a chip guiding groove; 500. and (5) mounting holes.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1-4, a sword drill bit includes: the drill body 100 and a cutting face, wherein the drill body 100 is a body part of the present sword-tooth drill bit, and the cutting face is used for cutting a workpiece.

Specifically, one end of the drill body 100 is provided with a toothed first limiting part 110, the first limiting part 110 is used for limiting the rotation of the sword-tooth drill bit after the assembly is completed, and the other end of the drill bit is provided with a cutting end 120;

the cutting surface comprises two spiral surfaces 210, the two spiral surfaces 210 are arranged at the cutting end 120, the two cutting surfaces meet at the central part of the cutting end 120 to form a convex cutting part 300, and the cutting part 300 is positioned at the highest position of the cutting surface;

the angle of the middle portion of the cutting portion 300 after being cut is α (as shown in fig. 2), wherein the angle of α ranges from 80 degrees to 100 degrees.

It should be further noted that, in the actual cutting process, since the cutting portion 300 is located at the highest position of the cutting surface, the cutting portion 300 of the drill body 100 will first contact with the workpiece, and the angle α is set within the range of 80-100 degrees, by the shape of the spiral surface 210 and the convex cutting portion 300 of the present sword tooth drill bit, the negative rake angle of the center portion of the cutting end 120 during actual processing is small, which means that the processing can be performed without a large extrusion force towards the workpiece, so that the heat release amount is greatly reduced, and the working efficiency is greatly improved.

It should be noted that the concept of negative rake angle in the drill processing is well known, and will not be described herein.

It should be further noted that, it is precisely because the cutting surface is formed by two spiral surfaces 210, such that the two spiral surfaces 210 meet at the middle portion of the cutting end 120 to form the convex cutting portion 300, and the angle of α of the cutting portion 300 can be controlled by controlling the arc surface of the two spiral surfaces 210.

As shown in fig. 1, 3 and 5, the side surface of the drill body 100 includes a first side surface 130 and a second side surface 140, and the first side surface 130 and the second side surface 140 are provided with a supporting portion 150 for supporting when cutting a hole, and the supporting portion 150 protrudes from the first side surface 130 and the second side surface 140;

it should be noted that, when the sword tooth drill bit is used for drilling, the supporting portion 150 can replace the first side surface 130 and the second side surface 140 to be in contact with the wall of the processed hole, and the existence of the supporting portion 150 can make the drill bit more stable during the processing and not shake.

Further, the supporting portion 150 includes a first protruding portion 151 and a second protruding portion 152, and ends of the first protruding portion 151 and the second protruding portion 152 are connected to the cutting surface;

it should be noted that, the support portion 150 is provided with two portions, namely, the first protruding portion 151 and the second protruding portion 152, so that stability of the drill during processing can be further improved.

As shown in fig. 1, 3 and 4, two chip guiding grooves 400 are arranged between the first side surface 130 and the second side surface 140, and the chip guiding grooves 400 are used for guiding out chips generated when the cutting surface is cut;

specifically, the chip guide groove 400 penetrates from the cutting end 120 of the drill body 100 to the end provided with the first limiting portion 110, so that chips generated during cutting of the cutting face can be immediately discharged from the chip guide groove 400, and the chips can be timely discharged to further increase the processing efficiency.

As shown in fig. 1 and 2, two mounting holes 500 are further provided in the drill body 100, and the two mounting holes 500 penetrate from the cutting end 120 to the first limiting portion 110.

In this embodiment, the mounting hole 500 is provided as a counterbore.

It should be noted that, screws may be disposed in the two mounting holes 500 to fix the present sword tooth drill bit to the cutter bar.

Next, there is also provided a cutting drill provided with the sword-tooth drill bit as described above, the cutting drill further provided with a shank (not shown in the drawings), and the drill body 100 is detachably connected to the shank.

Specifically, the drill body 100 and the rod body can be detachably connected together by screws penetrating through the two mounting holes 500 and being connected with the rod body.

Further, the end of the rod body is provided with a toothed second limiting part, the second limiting part is meshed with the first limiting part 110 of the drill body 100, and the rotation of the drill body 100 can be limited by the meshing of the first limiting part 110 and the second limiting part.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims (7)

1. A sword drill bit, comprising:

the drill body is provided with a toothed first limiting part at one end, a cutting end is arranged at the other end of the drill bit, a first side surface and a second side surface are arranged on the side surface of the drill bit, supporting parts for supporting when a hole is cut are arranged on the first side surface and the second side surface, and the supporting parts are protruded from the first side surface and the second side surface;

the cutting face comprises two spiral faces, the two spiral faces are arranged at the cutting end, the two cutting faces are intersected at the central part of the cutting end to form a convex cutting part, and the cutting part is located at the highest position of the cutting face;

the angle of the middle part of the cutting part after being cut is 80-100 degrees.

2. The sword drill bit of claim 1, wherein: the supporting part comprises a first protruding part and a second protruding part, and the end parts of the first protruding part and the second protruding part are connected with the cutting surface.

3. The sword drill bit of claim 1, wherein: two chip guiding grooves are arranged between the first side face and the second side face and used for guiding out chips generated during cutting of the cutting face.

4. The sword drill bit of claim 1, wherein: two mounting holes are further formed in the drill body, and the two mounting holes penetrate through the cutting end to the first limiting portion.

5. The sword drill bit of claim 4, wherein: the mounting holes are countersunk holes.

6. A cutting drill comprising the sword drill bit of any one of claims 1-5, further comprising a shank, said drill body being removably connected to said shank.

7. The cutting burr of claim 6, wherein: the end part of the rod body is provided with a toothed second limiting part, and the second limiting part is meshed with the first limiting part of the drill body.