CN216656468U

CN216656468U - Stepping hole-opening drill bit

Info

Publication number: CN216656468U
Application number: CN202122320262.4U
Authority: CN
Inventors: 赵卫军
Original assignee: Zhenjiang Yongyi Tools Co ltd
Current assignee: Zhenjiang Yongyi Tools Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-06-03
Anticipated expiration: 2031-09-24

Abstract

The utility model relates to a stepping hole-opening drill bit, which comprises a drill handle and a drill body, wherein step parts are symmetrically arranged on two sides of the front end of the drill body, drill tip parts are arranged at the front ends of the two step parts, two first inclined planes are symmetrically arranged on the front ends of the drill tip parts, positioning inclined planes are arranged on one sides of the first inclined planes, the inclination angles of the positioning inclined planes form a first central angle, edge edges are arranged on one sides of the positioning inclined planes, a pair of linear cutting edges A are arranged on two sides of the drill tip, the step parts are symmetrically arranged on the side walls of the two sides of the front end of the drill body, the step parts comprise a plurality of steps which are sequentially arranged, the diameter size of each step is gradually increased, a pair of linear cutting edges B are arranged on two sides of each step, a step inclined plane is arranged on one side of each step, the inclination angle of each step inclined plane forms a second central angle, and the angle of the second central angle is increased along with the increase of the diameter size of the step. The cutting efficiency can be improved, the occurrence probability of fracture is greatly reduced, and the tapping quality is effectively improved.

Description

Stepping hole drilling bit

Technical Field

The utility model belongs to the technical field of drill bit tools, and particularly relates to a stepping hole drilling drill bit.

Background

The drill is a tool for drilling through holes or blind holes in solid materials and for reaming existing holes. The commonly used drill bits mainly comprise a twist drill, a flat drill, a center drill, a deep hole drill, a trepanning drill and the like. Twist drills are the most widely used hole-machining tools, and typically have a diameter in the range of 0.25 to 80 mm. It is mainly composed of a drill working part and a handle part, wherein the working part is provided with two spiral grooves. At present, a high-speed steel drill bit is basically used for machining bolt holes by using hard alloy materials, the drill bit is provided with more than 2 cutting openings, the cutting speed is improved, but the head is small and continuously stressed, the head bears large pressure, the drill bit is easy to break, and the problems of insufficient guide type and overlarge burrs of a cutting edge are caused by excessive cutting openings.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problems and discloses a stepping hole opening drill bit which solves the problems that the head of the drill bit in the prior art is high in pressure bearing capacity and easy to break.

The specific technical scheme is as follows:

a stepping hole opening drill bit comprises a drill handle and a drill body, wherein the drill body is arranged at one end of the drill handle, step portions are symmetrically arranged on two sides of the front end of the drill body, a drill tip portion is arranged at the front end of the two step portions, two first inclined surfaces are symmetrically arranged at the front end of the drill tip portion, positioning inclined surfaces are arranged on one sides of the first inclined surfaces, the inclination angles of the positioning inclined surfaces form a first central angle, a side edge is arranged on one side of each positioning inclined surface, a pair of linear cutting edges A are arranged on two sides of the drill tip, the step portions are symmetrically arranged on the side walls of the two sides of the front end of the drill body and comprise a plurality of steps which are sequentially arranged, the diameter size of each step is gradually increased, a pair of linear cutting edges B are arranged on two sides of each step, a step inclined surface is arranged on one side of each step, the inclination angle of each step inclined surface forms a second central angle, and the angles of the second central angles are increased along with the increase of the diameter size of the steps, so that the transition from one step to the next step can be smoothly carried out during cutting.

Further, the angle between two symmetrical step inclined surfaces in the two step parts is less than 180 degrees.

Further, the angle of the first central angle is smaller than the angle of the second central angle.

Furthermore, chip grooves are formed in two sides of the drill tip portion and extend to the drill body.

The utility model has the beneficial effects that:

the front end of the drill bit adopts a step structure, and 3 cutting points are ensured between each group of steps and the side wall of the hole in the actual use process, so that the tunneling is carried out in a progressive mode, the cutting efficiency can be improved, the occurrence probability of breakage is greatly reduced, the usability of a cutter is obviously improved, and the hole opening quality is effectively improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of the front end structure of the drill body according to the present invention.

Fig. 3 is a schematic structural view of a first central angle and a second central angle in the present invention.

The drill comprises a drill shank 1, a drill body 2, a chip groove 21, a step part 3, a step 31, a step inclined surface 32, a second central angle 321, a linear cutting edge B322, a drill tip 4, a first inclined surface 41, a positioning inclined surface 42, a first central angle 421, a side edge 43 and a linear cutting edge A44.

Detailed Description

In order to make the technical scheme of the utility model clearer and clearer, the utility model is further described below by combining the attached drawings, and any scheme obtained by carrying out equivalent replacement and conventional reasoning on the technical characteristics of the technical scheme of the utility model falls into the protection scope of the utility model. The fixing and the arrangement of the fixing and the connection are all general connection modes in the mechanical field, and the fixing and the connection can be performed by welding, bolt and nut connection and screw connection.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the present invention.

As shown in fig. 1-3, a step-by-step drill bit includes a drill handle 1 and a drill body 2, wherein the drill body 2 is disposed at one end of the drill handle 1, step portions 3 are symmetrically disposed on two sides of the front end of the drill body 2, drill tips 4 are disposed at the front ends of the two step portions 3, two first inclined surfaces 41 are symmetrically disposed at the front ends of the drill tips 4, positioning inclined surfaces 42 are disposed on one sides of the first inclined surfaces 41, an inclination angle of the positioning inclined surfaces 42 forms a first central angle 421, the first central angle 421 is designed to reduce drilling resistance and increase step number as much as possible, an edge 43 is disposed on one side of each positioning inclined surface 42, a pair of straight cutting edges a44 are disposed on two sides of the drill tip 4, the step portions 3 are symmetrically disposed on two side walls of the front end of the drill body 2, each step portion 3 includes a plurality of steps arranged in sequence, the diameter of each step is gradually increased, a pair of straight cutting edges B322 are disposed on two sides of each step, one side of each step is provided with a step inclined surface 32, the inclined angle of each step inclined surface 32 forms a second central angle 321, and the angle of the second central angles 321 is increased along with the increase of the diameter of the step, so that the transition from one step to the next step can be smoothly carried out during cutting.

Further, the angle between two symmetrical step inclined surfaces 32 of the two step portions 3 is less than 180 °.

Further, the angle of the first central angle 421 is smaller than the angle of the second central angle 321.

Furthermore, chip grooves 21 are formed in two sides of the 4-part drill tip, and the chip grooves 21 extend to the drill body 2.

The working principle is as follows: in the step drilling process, a plurality of steps are simultaneously cut, and the cutting is tunneled in a progressive manner using a pair of linear cutting edges B322 of each step.

While the utility model has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The stepping hole opening drill bit comprises a drill handle (1) and a drill body (2), wherein the drill body (2) is arranged at one end of the drill handle (1), step parts (3) are symmetrically arranged at two sides of the front end of the drill body (2), a drill tip (4) part is arranged at the front end of each step part (3), two first inclined planes (41) are symmetrically arranged at the front end of each drill tip (4), the stepping hole opening drill bit is characterized in that a positioning inclined plane (42) is arranged at one side of each first inclined plane (41), a first central angle (421) is formed by the inclination angle of each positioning inclined plane (42), a side edge (43) is arranged at one side of each positioning inclined plane (42), a pair of linear cutting edges A (44) are arranged at two sides of each drill tip (4), the step parts (3) are symmetrically arranged on the side walls at two sides of the front end of the drill body (2), each step part (3) comprises a plurality of steps which are sequentially arranged, and the diameter size of each step is gradually increased, a pair of linear cutting edges B (322) are arranged on two sides of each step, a step inclined surface (32) is arranged on one side of each step, the inclined angle of each step inclined surface (32) forms a second central angle (321), and the angles of the second central angles (321) increase along with the increase of the diameter size of the step.

2. A step-hole drill according to claim 1, characterized in that the angle between two symmetrical step inclined surfaces (32) of said two step portions (3) is less than 180 °.

3. A step-and-hole drill bit, as claimed in claim 2, characterized in that said first central angle (421) has an angle smaller than the angle of said second central angle (321).

4. A step-and-shoot drill bit as claimed in claim 1, characterized in that said drill tip (4) is provided with chip flutes (21) on both sides, said chip flutes (21) extending to the drill body (2).