CN215880023U

CN215880023U - Gun drill with supporting strip

Info

Publication number: CN215880023U
Application number: CN202122356394.2U
Authority: CN
Inventors: 王紫
Original assignee: Shaanxi Golden Stone Machinery Mfg Co ltd
Current assignee: Shaanxi Golden Stone Machinery Mfg Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-02-22
Anticipated expiration: 2031-09-28

Abstract

The utility model discloses a gun drill bit with a supporting strip, and relates to a metal processing tool. In order to prevent the blade edge from damaging the inner hole wall of a workpiece when the machine-clamped gun drill is used for drilling and retreating the cutter, the utility model provides a gun drill with a supporting strip, which comprises a gun drill body, a blade and the supporting strip; the drill bit body is in an inverted cone shape, and a V-shaped chip groove is formed in the side surface of the drill bit body; the blade is arranged on one surface of a V-shaped chip groove at the head part of the drill bit body; the support bar is positioned in the middle of the drill bit body and is in threaded connection with the lower end face of the V-shaped chip groove; the sum of the diameter of the tangent plane circle at the supporting strip and the thickness of the supporting strip is equal to the diameter of the tangent plane circle at the blade edge. The utility model provides a gun drill with a supporting strip, which can avoid scratches on the inner hole wall of a workpiece when a tool is withdrawn after machining through the supporting strip arranged on the drill.

Description

Gun drill with supporting strip

Technical Field

The present invention relates to metal working tools, and more particularly to a gun bit having a support bar.

Background

A machine-clamped gun drill, also called a deep hole drill, is widely used in machine manufacturing and industrial production as a commonly used hole machining tool. Gun drills can be used not only for deep holes (1: 250 ratio) but also for shallow holes (1: 1 ratio). The gun drill usually comprises a drill handle, a drill rod and a drill bit, wherein a through hole is formed in the middle of the drill handle, and the gun drill is suitable for drilling cast iron, carbon steel, copper, aluminum alloy, alloy steel and the like.

Because the diameter of the head section circle of the drill bit is slightly larger than that of the tail section circle and is in an inverted cone shape, in the deep hole processing of nonferrous metals such as aluminum alloy and the like, the machine-clamped gun drill cannot sufficiently support the cutter because the workpiece material is too soft in the cutter retracting process after the drilling processing is finished, and a scratch is left on the inner hole wall of the workpiece by the cutter edge. The softer the material, the deeper the scratch, which seriously affects the quality of the inner hole to be processed and even causes the scrapping of the workpiece.

In view of the foregoing, there is a need for a gun drill with a support bar that overcomes the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to overcome the defects in the prior art, and provide a gun drill with a support bar, which can avoid the damage to a workpiece when the tool is retracted after the machining is finished through the support bar arranged on the drill.

In order to achieve the above purpose, the present invention mainly provides the following technical solutions: a gun drill with a supporting strip comprises a gun drill body, a blade and the supporting strip; the drill bit body is in an inverted cone shape, and a V-shaped chip groove is formed in the side surface of the drill bit body; the blade is arranged on one surface of a V-shaped chip groove at the head part of the drill bit body; the support bar is positioned in the middle of the drill bit body and is in threaded connection with the lower end face of the V-shaped chip groove; the sum of the diameter of the tangent plane circle at the supporting strip and the thickness of the supporting strip is equal to the diameter of the tangent plane circle at the blade edge.

Furthermore, the support bar has two faces, one face is located the one side of V type chip groove, another face and the lower terminal surface threaded connection of V type chip groove.

Compared with the prior art, the utility model has the following beneficial effects:

according to the gun drill with the supporting strips, the supporting strips are arranged on the drill, so that the sum of the diameter of the tangent plane circle at the supporting strips and the thickness of the supporting strips is equal to the diameter of the tangent plane circle at the cutting edge of the blade, and the damage to the inner hole of a workpiece caused by insufficient support of the cutter when the machine-clamped gun drill retracts after drilling is finished can be effectively prevented.

The gun drill with the supporting strip is simple in structure, reasonable in design, high in practicability and easy to popularize and use widely.

The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to enable the same to be carried into effect in accordance with the present specification, the following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic representation of the construction of a gun bit of the present invention having a support bar;

description of reference numerals:

1. a drill bit body; 11. a V-shaped chip groove;

2. a blade; 21. a blade;

3. a supporting strip;

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the intended purpose of the present invention, the following detailed description will be given of specific embodiments, structures, features and effects of a gun drill with a support bar according to the present invention with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1, a gun bit with a support strip includes a gun bit body 1, a blade 2 and a support strip 3; the drill bit body 1 is in an inverted cone shape, and a V-shaped chip groove 11 is formed in the side surface of the drill bit body 1; the blade 2 is arranged on one surface of a V-shaped chip groove 11 at the head part of the drill bit body 1; the support bar 3 is positioned in the middle of the drill bit body 1 and is in threaded connection with the lower end face of the V-shaped chip groove 11; the sum of the diameter of the tangent circle at the supporting strip 3 and the thickness of the supporting strip 3 is equal to the diameter of the tangent circle at the cutting edge 21 of the blade 2.

According to the gun drill with the supporting strips, the drill body 1 is inverted cone-shaped, the diameter of a head section circle of the drill body 1 is slightly larger than that of a tail section circle of the drill body 1, the side face of the drill body 1 is provided with the V-shaped chip removal groove 11, the supporting strips 3 are installed on the lower end face of the V-shaped chip removal groove 11, and when the sum of the diameter of the section circle of the supporting strips 3 and the thickness of the supporting strips 3 is equal to the diameter of the section circle of the cutting edge 21 of the blade 2, a cutter is supported by the supporting strips 3 when the cutter is withdrawn, so that a workpiece cannot be damaged.

According to the gun drill with the support bar, the support bar 3 is provided with two surfaces, one surface is located on one surface of the V-shaped chip groove 11, and the other surface is in threaded connection with the lower end surface of the V-shaped chip groove 11.

According to the gun drill with the support bar, the support bar 3 is provided with two surfaces, one surface is positioned on one surface of the V-shaped chip groove 11, and the other surface is in threaded connection with the lower end surface of the V-shaped chip groove 11, so that the support bar 3 is fixed and replaced conveniently.

The present invention has been further described with reference to the examples, but the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The utility model provides a rifle drill bit with support bar which characterized in that:

comprises a gun drill head body (1), a blade (2) and a supporting strip (3); the drill bit body (1) is in an inverted cone shape, and a V-shaped chip groove (11) is formed in the side surface of the drill bit body (1); the blade (2) is arranged on one surface of a V-shaped chip groove (11) at the head part of the drill bit body (1); the support bar (3) is positioned in the middle of the drill bit body (1) and is in threaded connection with the lower end face of the V-shaped chip groove (11); the sum of the diameter of the tangent plane circle at the supporting strip (3) and the thickness of the supporting strip (3) is equal to the diameter of the tangent plane circle at the cutting edge (21) of the blade (2).

2. The gun bit with brace of claim 1 further comprising:

the support bar (3) is provided with two faces, one face is located on one face of the V-shaped chip groove (11), and the other face is in threaded connection with the lower end face of the V-shaped chip groove (11).