CN111408770A

CN111408770A - High-strength twist drill

Info

Publication number: CN111408770A
Application number: CN202010316979.9A
Authority: CN
Inventors: 朱炜峰
Original assignee: Jiangsu Boan Tools Co ltd
Current assignee: Jiangsu Boan Tools Co ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-07-14

Abstract

The invention discloses a high-strength twist drill, which comprises a drill rod; the two spiral drill edges are connected with the drill rod and are separated by spiral chip grooves; the conical tip extends to the center of the front end of the spiral drill blade and is annularly provided with a spiral cutting blade; and an inner concave part arranged at the front end of the spiral chip groove and facing the cutting direction. According to the invention, the spiral chip groove is matched with the spiral drill blade for drilling, the conical tip is matched with the spiral cutting blade for feeding, and the concave part is dug deeply, so that the drilling strength is improved, and the troubles of low drilling efficiency and easy abrasion are avoided.

Description

High-strength twist drill

Technical Field

The application belongs to the technical field of drill bits, and specifically relates to a high strength twist drill.

Background

The drill is a tool for drilling through holes or blind holes in solid materials and reaming existing holes. Drill bits can be classified into rough machining and fine machining, and the rough machining drill bit generally has a large cutting amount, so that a cutting edge is greatly abraded in the cutting process.

Disclosure of Invention

In view of this, the technical problem that this application will be solved provides a high strength fluted drill, through the drilling of spiral chip groove cooperation auger bit sword, the circular cone top cooperates the spiral cutting edge to feed, and the concave part digs deeply, improves drilling intensity, avoids boring for the trouble of inefficiency, easy wearing and tearing.

In order to solve the technical problem, the invention discloses a high-strength twist drill, which comprises a drill rod; the two spiral drill edges are connected with the drill rod and are separated by spiral chip grooves; the conical tip extends to the center of the front end of the spiral drill blade and is annularly provided with a spiral cutting blade; and an inner concave part arranged at the front end of the spiral chip groove and facing the cutting direction.

According to an embodiment of the invention, the groove from the conical tip to the spiral chip removal groove is provided with a cambered groove.

According to an embodiment of the present invention, a protrusion extends from one end of the spiral drill blade adjacent to the inner recess, and the protrusion height is 1 to 2 mm.

According to an embodiment of the present invention, the thickness of the spiral cutting edge is gradually reduced from inside to outside, and the width of the spiral cutting edge is at least 3 mm.

According to an embodiment of the present invention, the concave portions are located at two outer sides of the spiral flute, and the central portion is concavely curved, and the depth of the concavity is 3 mm.

According to an embodiment of the present invention, the spiral drill blades are disposed at both sides of the conical tip as feeding inclined planes, and the feeding inclined planes are radially inclined by 13 °.

According to an embodiment of the invention, the drill rod is provided as a hexagonal shank.

Compared with the prior art, the application can obtain the following technical effects:

through the drilling of spiral chip groove cooperation spiral drill edge, the circular cone top cooperation spiral cutting edge feeds, and the concave part digs deeply, improves drilling intensity, avoids boring for the trouble of inefficiency, easy wearing and tearing.

Of course, it is not necessary for any one product to achieve all of the above-described technical effects simultaneously.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic view of a high strength twist drill according to an embodiment of the present application.

Reference numerals

The drill rod 10, the spiral drill blade 20, the spiral chip groove 30, the conical tip 40, the spiral cutting blade 50, the inner concave part 60, the radian groove 70, the convex part 80 and the feeding inclined surface 90.

Detailed Description

Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

Referring to fig. 1, fig. 1 is a schematic view of a high-strength twist drill according to an embodiment of the present application. As shown, a high strength twist drill includes a drill rod 10; the spiral drill blades 20 of the drill rod 10 are connected, and two spiral drill blades 20 are arranged and are separated by spiral chip grooves 30; the conical tip 40 extends to the center of the front end of the spiral drill blade 20, and the spiral cutting blade 50 is annularly arranged on the conical tip 40; and an inner concave portion 60 provided at a front end of the spiral flute 30 and facing a cutting direction.

In one embodiment of the present invention, the drill rod 10 is connected to auger blades 20, and the auger blades 20 are spaced apart by helical flutes 30, which cooperate to provide drilling feed. The front end of the spiral drill blade 20 is provided with a conical tip 40, the conical tip 40 is provided with spiral cutting blades 50 in a distributed mode, the conical tip 40 is arranged on the surface of the conical tip 40 in a surrounding mode, tip drilling is achieved, the overall size is smaller than that of the spiral drill blade 20, feeding is easier, and the spiral drill blade is efficient and convenient.

In addition, also have the interior concave part 60 towards the cutting direction at spiral chip groove 30 front end, interior concave part 60 is located two outsides of spiral chip groove 30, and central radian is sunken, and sunken degree of depth is 3mm, fully digs when boring and cuts, improves the trompil effect, reduces the resistance, and the pore wall is more smooth, and stability is better.

The part from the conical center 40 to the spiral chip groove 30 is provided with a radian groove 70, on one hand, the radian groove 70 is increased to form a concave part, the strength of the spiral cutting edge 50 is improved, and the trouble that the traditional integral spiral is easy to break is avoided; on the other hand, chip removal is convenient when the front end drills into, so that the hole wall is more convenient to form.

The one end of the adjacent interior recess 60 of auger bit 20 extends and sets up bellying 80, and protruding height is 1~2 mm. In this embodiment, the thickness of the front end of the auger bit 20 is relatively increased to form the protruding portion 80, so that the auger bit can be conveniently removed when the auger bit is withdrawn, and the auger bit is more convenient to use.

Preferably, the spiral cutting edge 50 is tapered from inside to outside in thickness and has a width of at least 3mm to form a sharp cut, which is more efficient in drilling.

In addition, the spiral drill edges 50 are arranged on two sides of the conical tip 40 to form feeding inclined planes 90, the feeding inclined planes 90 are radially inclined by 13 degrees and matched with the conical tip 40 to finish the drilling depth of the hole wall, and the two feeding inclined planes 90 are inclined by a certain angle along the cutting direction, so that the feeding is facilitated. .

Preferably, the drill rod 10 is provided with a hexagonal handle, so that the drill rod is convenient to add and connect and wide in application.

In conclusion, the spiral chip groove is matched with the spiral drill edge for drilling, the conical tip is matched with the spiral cutting edge for feeding, the inner concave part is deeply dug, the drilling strength is improved, and the troubles that the drilling efficiency is low and the drilling is easy to wear are avoided.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims

1. A high strength twist drill, comprising:

a drill stem;

the spiral drill blades are connected with the drill rod, and the two spiral drill blades are separated by spiral chip grooves;

the conical tip extends to the center of the front end of the spiral drill blade and is annularly provided with a spiral cutting blade; and

and the inner concave part is arranged at the front end of the spiral chip groove and faces to the cutting direction.

2. The high strength twist drill according to claim 1, wherein the conical point to the helical flute portion define a curved undercut.

3. The high-strength twist drill according to claim 1, wherein a protrusion extends from one end of the helical drill edge adjacent to the inner recess, and the protrusion height is 1-2 mm.

4. The high strength twist drill according to claim 1, wherein the helical cutting edge tapers from inside to outside in thickness and has a width of at least 3 mm.

5. The high strength twist drill according to claim 1, wherein the recessed portions are located on both outer sides of the helical flutes and are centrally arcuately recessed to a depth of 3 mm.

6. The high strength twist drill according to claim 1, wherein the helical cutting edges are provided as feed ramps on both sides of the conical point, the feed ramps being radially inclined by 13 °.

7. The high strength twist drill according to claim 1, wherein the drill stem is provided as a hexagonal shank.