CN217889606U - Improved hollow drill bit - Google Patents

Abstract

The utility model discloses a hollow drill bit of improvement, including the cutting part, bore body and bore the tail, the cutting part includes 4 cutting edges that the annular distributes, and it has the recess concentric with the drill bit to open on the cutting edge, and it has 1~2 strip recess to open on every cutting edge, and the recess on two adjacent cutting edges distributes that staggers each other. The relief angle of the cutting edge is 20 °. The material of the cutting edge is hard alloy. Through the mutually staggered grooves on the cutting edges, the contact surface between the cutting edges and steel is reduced, the cutting resistance of the cutting edges is reduced, and the drilling efficiency of the drill bit is improved; the groove can also increase the heat dissipation of the cutting edge and slow down the abrasion of the cutting edge. In addition, the groove can also facilitate scrap iron discharge when the cutting edge discharges the cutting scraps, reduce the wire outlet of the pricking phenomenon, and prolong the service life of the drill bit. Increasing the relief angle of the edge to 20 deg. further reduces the chip forces. The contact surface between the cutting edge and the steel is reduced, the noise pollution generated by the drill bit is reduced, and the working environment is improved.

Description

Improved hollow drill bit

Technical Field

The utility model relates to the field of machining, in particular to hollow drill bit.

Background

In the production of steel, a section of bar stock needs to be taken out from a steel core for material performance test, and the bar stock is generally taken out by a hollow drill bit. When a common hollow drill bit drills steel, the contact area of a cutting edge on the steel is large, so that the resistance of cutting is large, the heat is serious, the cutting edge is easy to wear, and the drill bit is easy to crack when the cutting edge is seriously worn. In order to prevent the drill bit from cracking, the drill bit must be controlled to slowly feed, so that the drilling efficiency is low. And because the contact area between the cutting edge and the steel is large, the cutting resistance of the cutting edge is large, and a drill bit generates a large amount of noise in the drilling operation, so that the serious noise pollution of the operation environment is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hollow drill of improvement is through reducing the area of contact between cutting edge and steel to reduce the smear metal resistance, reduce the drill bit and generate heat, promote to bore and get efficiency.

This real dirt is realized with novel through following technical scheme:

the improved hollow drill bit includes one edge part comprising 4 annularly distributed cutting edges with mutually staggered grooves.

And further: each blade is provided with 1~2 grooves.

And further: the back angle of the cutting edge is 10-20 degrees.

Further: the material of the cutting edge is hard alloy.

Compared with the prior art, the utility model have following advantage:

1. the groove is formed in the cutting edge, so that the contact surface between the cutting edge and steel is reduced, the cutting resistance of the cutting edge is reduced, and the drilling efficiency of the drill is improved.

2. And the back angle of the cutting edge is increased to 10-20 degrees, so that the cutting force is further reduced.

3. The groove increases the heat dissipation of the cutting edge and slows down the abrasion of the cutting edge.

4. The groove facilitates the scrap iron discharge generated when the cutting edge scraps, reduces the wire outlet of the pricking phenomenon, and prolongs the service life of the drill bit

5. The contact surface between the cutting edge and the steel is reduced, the noise pollution generated by the drill bit is reduced, and the working environment is improved.

Drawings

FIG. 1 is a front view of the present invention;

fig. 2 is a schematic top view of the present invention.

In the figure:

1. a blade part; 1.1, a blade; 1.11, a groove; 2. drilling a body; 3. and (6) drilling a tail.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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.

The scale is realized by the following technical scheme:

an improved hollow drill bit comprises a blade part 1, a drill body 2 and a drill tail 3, wherein the blade part 1 comprises 4 cutting edges 1.1 which are distributed annularly, grooves 1.11 which are concentric with the drill bit are formed in the cutting edges 1.1, 1~2 grooves 1.11 are formed in each cutting edge 1.1, and the grooves 1.11 in the two adjacent cutting edges 1.1 are distributed in a staggered mode. The cutting edge 1.1 has a relief angle of 20. The material of the cutting edge 1.1 is hard alloy.

The utility model discloses a working principle is:

through the mutually staggered grooves 1.11 on the cutting edge 1.1, the contact surface between the cutting edge 1.1 and steel is reduced, the cutting resistance of the cutting edge 1.1 is reduced, and the drilling efficiency of the drill bit is improved; the contact surface between the cutting edge 1.1 and steel is reduced, the noise pollution generated by the drill bit is reduced, and the working environment is improved. The groove 1.11 can also increase the heat dissipation of the blade 1.1 and slow down the abrasion of the blade 1.1. In addition, recess 1.11 can also make things convenient for cutting edge 1.1 to produce iron fillings when with the smear metal and discharge, reduces the play line of pricking sword phenomenon, improves drill bit life. Increasing the relief angle of the edge 1.1 to 20 deg. further reduces the chip forces.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (4)

1. The utility model provides a hollow drill of improvement, includes cutting part (1), bores body (2) and bores tail (3), cutting part (1) including 4 cutting edges (1.1) of annular distribution, its characterized in that: the cutting edges (1.1) are provided with grooves (1.11) which are concentric with the drill bit, and the grooves (1.11) on two adjacent cutting edges (1.1) are mutually staggered.

2. An improved core drill bit as set forth in claim 1, wherein: each blade (1.1) is provided with 1~2 grooves (1.11).

3. An improved core drill bit as set forth in claim 1, wherein: the back angle of the cutting edge (1.1) is 10-20 degrees.

4. An improved core drill bit as set forth in claim 1, wherein: the material of the cutting edge (1.1) is hard alloy.

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