CN211866686U

CN211866686U - Step drill

Info

Publication number: CN211866686U
Application number: CN202020433331.5U
Authority: CN
Inventors: 陈朋跃; 赵晓文
Original assignee: Shenzhen Xin Jinquan Diamond Cutting Tool Co ltd
Current assignee: Shenzhen Xinjinquan Precision Technology Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-11-06
Anticipated expiration: 2030-03-30

Abstract

The utility model relates to a step drill, including the drill handle and the drill bit that are used for the clamping, the drill bit includes one-level drill bit, second grade drill bit and tertiary drill bit, tertiary drill bit is established in the one end of drill handle, the second grade drill bit is established in the one end of tertiary drill bit, the one-level drill bit is established in the one end of second grade drill bit, form first step face between one-level drill bit and the second grade drill bit, form the second step face between secondary grade drill bit and the tertiary drill bit, first step face and second step face are the arc surface; wherein, the diameter of the primary drill bit is smaller than that of the secondary drill bit, and the diameter of the secondary drill bit is smaller than that of the tertiary drill bit. Because the step surface is an arc surface, the machined hole has perfect roughness and no ripple after being chamfered, and the machining quality of the workpiece is greatly improved.

Description

Step drill

Technical Field

The utility model relates to a drill bit technical field, especially a step bores.

Background

When a stepped hole is drilled by a common twist drill, drills with different diameters need to be used for drilling for many times, but the drill is not easy to align to the center during drilling, and hole deviation is easy to cause. The step drill can successfully drill holes at one time, and the problem that the center is not required to be aligned is well solved.

As shown in FIG. 1, the step surface 1 of the conventional step drill consists of a plurality of planes, and when a hole is drilled and chamfered, ripples appear at the chamfered part, which affects the processing quality of a workpiece.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a step bores, aims at solving the chamfer department that current step bore processing and can appear the ripple, influences the problem of work piece quality.

The utility model provides a technical scheme that its technical problem adopted is: the step drill comprises a drill handle and a drill bit for clamping, wherein the drill bit comprises a first-stage drill bit, a second-stage drill bit and a third-stage drill bit, the third-stage drill bit is arranged at one end of the drill handle, the second-stage drill bit is arranged at one end of the third-stage drill bit, the first-stage drill bit is arranged at one end of the second-stage drill bit, a first step surface is formed between the first-stage drill bit and the second-stage drill bit, a second step surface is formed between the second-stage drill bit and the third-stage drill bit, and the first step surface and the second step surface; wherein, the diameter of the primary drill bit is smaller than that of the secondary drill bit, and the diameter of the secondary drill bit is smaller than that of the tertiary drill bit.

Further, the diameter of the drill shank is larger than the diameter of the tertiary drill bit.

Further, a third step surface is formed between the drill shank and the tertiary drill bit.

Further, the third step surface is an arc surface.

Further, the surface of the drill handle is provided with anti-skidding threads.

Further, the anti-slip threads are double-helical threads.

Compared with the prior art, the utility model provides a step drill, form first step face between first grade drill bit and the second grade drill bit, form the second step face between second grade drill bit and the tertiary drill bit, first step face and second step face are the arc surface; because the step surface is an arc surface, the machined hole has perfect roughness and no ripple after being chamfered, and the machining quality of the workpiece is greatly improved.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a schematic diagram of a prior art bit step face configuration;

fig. 2 is a schematic structural view of the step drill provided by the present invention.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 2, the utility model provides a step drill, including the drill handle 10 and the drill bit 20 that are used for the clamping, drill bit 20 includes one-level drill bit 21, second grade drill bit 22 and tertiary drill bit 23, and tertiary drill bit 23 is established in the one end of drill handle 10, and second grade drill bit 22 is established in the one end of tertiary drill bit 23, and one-level drill bit 21 is established in the one end of secondary grade drill bit 22, forms first step face 24 between one-level drill bit 21 and the secondary drill bit 22, forms second step face 25 between secondary grade drill bit 22 and the tertiary drill bit 23, first step face 24 and second step face 25 are the arc surface. Because the step surface is an arc surface, the machined hole has perfect roughness and no ripple after being chamfered, and the machining quality of the workpiece is greatly improved. Wherein, the diameter of the primary drill 21 is smaller than that of the secondary drill 22, and the diameter of the secondary drill 22 is smaller than that of the tertiary drill 23.

Further, the diameter of the drill shank 10 is larger than that of the tertiary drill bit 23, so that the whole step drill is more stable. In the present embodiment, a third step surface 26 is formed between the drill shank 10 and the tertiary drill bit 23, and the third step surface is an arc surface, and also has no ripple effect when a hole is chamfered.

Further, the surface of the drill shank 10 is provided with anti-slip threads. In the present embodiment, the anti-slip threads are double helical threads, which can enhance the stability of the clamping of the drill shank 10 and prevent the drill shank from falling off.

The utility model provides a pair of step drill through setting up one-level drill bit 21, second grade drill bit 22 and tertiary drill bit 23, once only bores into platform form hole to the material, avoids the drilling error that secondary operation leads to, improves work efficiency, reduces the production of defective products to reduce the wearing and tearing of drill bit, increase the life of drill bit.

It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features; and all such modifications and alterations should fall within the scope of the appended claims.

Claims

1. A step drill comprises a drill handle and a drill bit for clamping, and is characterized in that the drill bit comprises a primary drill bit, a secondary drill bit and a tertiary drill bit, the tertiary drill bit is arranged at one end of the drill handle, the secondary drill bit is arranged at one end of the tertiary drill bit, the primary drill bit is arranged at one end of the secondary drill bit, a first step surface is formed between the primary drill bit and the secondary drill bit, a second step surface is formed between the secondary drill bit and the tertiary drill bit, and the first step surface and the second step surface are both arc surfaces; wherein, the diameter of the primary drill bit is smaller than that of the secondary drill bit, and the diameter of the secondary drill bit is smaller than that of the tertiary drill bit.

2. The step drill of claim 1, wherein the diameter of the shank is greater than the diameter of a tertiary drill bit.

3. The step drill of claim 2, wherein a third step face is formed between the shank and the tertiary drill bit.

4. The step drill of claim 3, wherein the third step surface is a circular arc surface.

5. A step drill according to any one of claims 1 to 4, wherein the surface of the shank is provided with anti-slip threads.

6. The step drill of claim 5, wherein the non-slip threads are double helical threads.