CN216656468U - Stepping hole-opening drill bit - Google Patents

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

A stepping drill bit

technical field

The utility model belongs to the technical field of drill tools, in particular to a stepping drill.

Background technique

A drill is a tool used to drill through holes or blind holes in solid materials and to ream existing holes. Commonly used drills mainly include twist drills, flat drills, center drills, deep hole drills and nesting drills. Twist drills are the most widely used hole machining tools, usually in the range of 0.25 to 80 mm in diameter. It is mainly composed of the working part of the drill bit and the shank, and the working part has two spiral grooves. At present, when machining bolt holes with cemented carbide materials, high-speed steel drills are basically used. The drills have more than 2 cutting ports. Although the cutting speed is increased, the heads are small and continuously subjected to force. Too many cutting ports also lead to insufficient guide type and too large edge burrs.

Utility model content

Aiming at the above problems, the utility model discloses a step-by-step drilling bit, which solves the problems of the prior art that the head of the drill bit bears high pressure and is easy to break.

The specific technical solutions are as follows:

A stepping hole drill bit comprises a drill shank and a drill body, one end of the drill shank is provided with a drill body, two sides of the front end of the drill body are symmetrically provided with stepped portions, and the front ends of the two stepped portions are provided with a drill tip portion. The front end of the tip is symmetrically provided with two first inclined surfaces, one side of the first inclined surface is provided with a positioning inclined surface, the inclination angle of the positioning inclined surface forms a first central angle, and one side of the positioning inclined surface is provided with an edge edge, A pair of straight cutting edges A are arranged on both sides of the drill tip, and the stepped portions are symmetrically arranged on the side walls of both sides of the front end of the drill body. A pair of linear cutting edges B are provided on both sides of each step, and a step inclined surface is provided on one side of each step. The diameter size increases and increases, making it possible to smoothly transition from one step to the next during cutting.

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

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

Further, both sides of the drill tip portion are provided with chip removal grooves, and the chip removal grooves extend to the drill body.

The beneficial effects of the present utility model are embodied in:

The front end of the drill bit of the utility model adopts a stepping step structure. During the actual use process, it is ensured that there are three cutting points between each group of steps and the side wall of the hole, so that the drilling is carried out in a progressive manner, which can improve the cutting efficiency and greatly reduce the The probability of breakage significantly improves the ease of use of the tool and effectively improves the quality of the opening.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

FIG. 2 is a schematic diagram of the structure of the front end of the drill body in the utility model.

FIG. 3 is a schematic structural diagram of a first center angle and a second center angle in the utility model.

Drill shank 1, drill body 2, chip flute 21, step part 3, step 31, step slope 32, second center angle 321, straight cutting edge B 322, drill tip 4, first slope 41, positioning slope 42, The first center angle 421, the edge edge 43, and the straight cutting edge A44.

Detailed ways

In order to make the technical solution of the present utility model clearer and clearer, the present utility model is further described below in conjunction with the accompanying drawings. Any solution obtained by equivalent replacement of the technical features of the technical solution of the present utility model and conventional reasoning shall fall into the protection of the present utility model. scope. The fixed connection and the fixed arrangement mentioned in the present utility model are all common connection methods in the mechanical field, including welding, bolt-nut connection and screw connection.

In the description of the invention of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" ", "bottom", "inside", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying The device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

As shown in Figures 1-3, a step-by-step drilling drill includes a drill shank 1 and a drill body 2. One end of the drill shank 1 is provided with a drill body 2, and two sides of the front end of the drill body 2 are symmetrically provided with stepped portions 3. The front end of each step portion 3 is provided with a drill tip 4, the front end of the drill tip 4 is symmetrically provided with two first inclined surfaces 41, and one side of the first inclined surface 41 is provided with a positioning inclined surface 42. The positioning inclined surface The inclination angle of 42 forms a first center angle 421. The design of the first center angle 421 should not only reduce the drilling resistance, but also increase the number of steps as much as possible. One side of the positioning slope 42 is provided with an edge 43, and the drill tip 4 is provided with two edges. A pair of straight cutting edges A44 are arranged on the side, and the stepped portion 3 is symmetrically arranged on the side walls of the front end of the drill body 2. The stepped portion 3 includes a plurality of steps arranged in sequence, and the diameter of each step gradually increases. A pair of linear cutting edges B322 are provided on both sides of each step, and a step inclined surface 32 is provided on one side of each step. The angle increases with the diameter of the step, so that it can smoothly transition from one step to the next during cutting.

Further, the angle between the two symmetrical stepped inclined surfaces 32 of the two stepped 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 .

Further, chip removal grooves 21 are provided on both sides of the drill tip 4 , and the chip removal grooves 21 extend to the drill body 2 .

Working principle: During the step drilling process, multiple steps are cut at the same time, and a pair of linear cutting edges B322 on each step are used to advance and cut in a progressive manner.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. The changes or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (4)

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).

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