Drill bit structure and shallow hole drill

Abstract

The utility model discloses a drill bit structure and a shallow hole drill, and belongs to the field of hole machining tools. The outer circle blade and the center blade are connected to the two sides of one end of the drill bit body in an indexable mode respectively; the first chip groove and the second chip groove are both formed in the drill bit body, the first chip groove is communicated with the outer circle blade, and the second chip groove is communicated with the center blade; the first damping pad and the second damping pad are connected to the two sides of one end of the drill bit body respectively, the first damping pad and the outer circle blade are correspondingly arranged, and the second damping pad and the center blade are correspondingly arranged. The utility model has the technical effect that the vibration of the shallow hole drill during cutting is smaller.

Description

Technical Field

[0001] The utility model relates to a hole machining tool, in particular to a drill bit structure and a short drill. Background Technique

[0002] A short drill, also known as a U-drill or a brute-force drill, is generally used for machining holes with a hole depth less than three times the hole diameter and is widely used in the field of hole machining.

[0003] In order to increase the service life, the relevant short drills generally have indexable inserts. For example, the Chinese utility model patent, publication number: CN212239316U, publication date: December 29, 2020, discloses an indexable U-drill, which includes an integral body, the body includes a shank and a handle, and two spiral chip flutes are provided on the shank around the outer circumference of the shank. The inner wall of the front end of the chip flute is substantially L-shaped. The inner wall of the front end of the chip flute is composed of a first wall and a second wall connected to each other. A groove for installing the insert is provided on the first wall, and a cemented carbide layer is provided on the second wall. The cemented carbide layer is formed on the second wall by spraying. The outer surface of the cemented carbide layer is smooth and flat, and under the action of the cemented carbide layer, the hardness of the second wall is greater than that of the body. Its disadvantage is that since the cutting methods of the relevant U-drills are all unbalanced cutting and cannot stably center, it is still easy to cause large vibrations during cutting. Summary of the Utility Model

[0004] Utility Model Purpose: The purpose of the present utility model is to provide a drill bit structure that facilitates less vibration during cutting of the short drill; another purpose of the present utility model is to provide a short drill.

[0005] Technical Solution: A drill bit structure includes:

[0006] A drill bit body;

[0007] An outer round insert and a center insert that are respectively indexably connected to both sides of one end of the drill bit body;

[0008] Both are provided in a first chip flute and a second chip flute of the drill bit body. The first chip flute is communicated with the outer round insert, and the second chip flute is communicated with the center insert;

[0009] A first damping pad and a second damping pad that are respectively connected to both sides of one end of the drill bit body. The first damping pad is correspondingly arranged with the outer round insert, and the second damping pad is correspondingly arranged with the center insert.

[0010] Optionally, it further includes a first placement groove and a second placement groove respectively provided on both sides of one end of the drill bit body. The first damping pad is located in the first placement groove, the second damping pad is located in the second placement groove, the first placement groove corresponds to the outer circular blade, and the second placement groove corresponds to the center blade.

[0011] Optionally, the width of the first placement groove is smaller than the thickness of the first damping pad, and the width of the second placement groove is smaller than the thickness of the second damping pad.

[0012] Optionally, the widths of both the first placement groove and the second placement groove are greater than 0 mm and less than or equal to 10 mm; the thicknesses of both the first damping pad and the second damping pad are greater than 0 mm and less than or equal to 10 mm.

[0013] Optionally, the outer sides of both the first damping pad and the second damping pad are lower than the outer circumference of one end of the drill bit body.

[0014] Optionally, there is a first spacing between the first damping pad and the outer circular blade, and a second spacing between the second damping pad and the center blade.

[0015] Optionally, both the first spacing and the second spacing are greater than 0 mm and less than or equal to 10 mm.

[0016] A shallow hole drill includes a drill bit structure and further includes a shank connected to the other end of the drill bit body.

[0017] Beneficial effects: Since the first damping pad corresponds to the outer circular blade, it is convenient for the first damping pad to reduce the vibration received by the outer circular blade. Since the second damping pad corresponds to the center blade, it is convenient for the second damping pad to reduce the vibration received by the center blade, making the vibration of the drill bit structure of the present application smaller during cutting. When the drill bit structure of the present application is used in a shallow hole drill, the vibration of the shallow hole drill during cutting is smaller. Among them, the materials of the first damping pad and the second damping pad can be butyl rubber, polyurethane, epoxy resin, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is one of the structural schematic diagrams of a drill bit structure according to Embodiment 1 of the present utility model;

[0019] Figure 2 It is the second of the structural schematic diagrams of a drill bit structure according to Embodiment 1 of the present utility model;

[0020] In the figure: 1. Drill bit body; 11. First chip removal groove; 12. Second chip removal groove; 13. First placement groove; 14. Second placement groove; 2. Outer circular blade; 3. Center blade; 41. First damping pad; 42. Second damping pad. Detailed implementation mode

[0021] To make the technical solution of the present utility model clearer, the following further elaborates on the present utility model in detail with reference to the accompanying drawings and specific embodiments.

[0022] Embodiment 1

[0023] As Figure 1-2 , this embodiment provides a drill bit structure, including: a drill bit body 1; an outer circular blade 2 and a center blade 3 respectively rotatably connected to both sides of one end of the drill bit body 1; a first chip removal groove 11 and a second chip removal groove 12 both provided on the drill bit body 1, the first chip removal groove 11 communicating with the outer circular blade 2, and the second chip removal groove 12 communicating with the center blade 3; a first damping pad 41 and a second damping pad 42 respectively connected to both sides of one end of the drill bit body 1, the first damping pad 41 being correspondingly arranged with the outer circular blade 2, and the second damping pad 42 being correspondingly arranged with the center blade 3.

[0024] Specifically, the drill bit body 1 is used to carry the outer circular blade 2, the center blade 3, the first chip flute 11, the second chip flute 12, the first damping pad 41, the second damping pad 42, etc.; the outer circular blade 2 is mainly used for machining the outer circle of the hole, and the center blade 3 is mainly used for machining the center of the hole. During installation, only by selecting and installing them at appropriate relative radial positions, the outer circular blade 2 and the center blade 3 can be formed. Since both the outer circular blade 2 and the center blade 3 are rotatably connected to the drill bit body 1, it is equivalent to that each side of the outer circular blade 2 and the center blade 3 can be rotated after cutting for a period of time, which is convenient for the outer circular blade 2 and the center blade 3 to have a long service life. Among them, the rotatable connection can be specifically realized by fasteners such as screws. The specific angle between the outer circular blade 2 and the center blade 3 is not limited, and it can be 180 degrees, that is, the outer circular blade 2 and the center blade 3 are equally divided, or it can be not 180 degrees, that is, the outer circular blade 2 and the center blade 3 are not equally divided. Preferably, it is 180 degrees; the first chip flute 11 is used to discharge the waste chips from the outer circular blade 2, and the second chip flute 12 is used to discharge the waste chips from the center blade 3. Among them, the shapes of the first chip flute 11 and the second chip flute 12 are preferably spiral, which is convenient for the waste chips to be discharged in the direction opposite to the drilling direction; since the first damping pad 41 is correspondingly arranged with the outer circular blade 2, it is convenient for the first damping pad 41 to reduce the vibration received by the outer circular blade 2. Since the second damping pad 42 is correspondingly arranged with the center blade 3, it is convenient for the second damping pad 42 to reduce the vibration received by the center blade 3, so that the vibration of the drill bit structure of the present application during cutting is small. When the drill bit structure of the present application is used for a shallow hole drill, the vibration of the shallow hole drill during cutting is small. Among them, the materials of the first damping pad 41 and the second damping pad 42 can be butyl rubber, polyurethane, epoxy resin, etc.

[0025] Further, as Figure 2 , it further includes a first placement groove 13 and a second placement groove 14 respectively arranged on both sides of one end of the drill bit body 1. The first damping pad 41 is located in the first placement groove 13, and the second damping pad 42 is located in the second placement groove 14. The first placement groove 13 is correspondingly arranged with the outer circular blade 2, and the second placement groove 14 is correspondingly arranged with the center blade 3. Specifically, the first placement groove 13 is used to place the first damping pad 41, which is convenient for the first damping pad 41 to have good stability; the second placement groove 14 is used to place the second damping pad 42, which is convenient for the second damping pad 42 to have good stability.

[0026] Further, as Figure 2, the width of the first placement groove 13 is less than the thickness of the first damping pad 41, and the width of the second placement groove 14 is less than the thickness of the second damping pad 42. Specifically, the width of the first placement groove 13 is relatively small, and the thickness of the first damping pad 41 is relatively large. When the first damping pad 41 is located in the first placement groove 13, the first damping pad 41 is slightly squeezed, which is convenient for making the connection tightness between the first damping pad 41 and the first placement groove 13 good, and preventing the first damping pad 41 and the first placement groove 13 from separating from each other; the width of the second placement groove 14 is relatively small, and the thickness of the second damping pad 42 is relatively large. When the second damping pad 42 is located in the second placement groove 14, the second damping pad 42 is slightly squeezed, which is convenient for making the connection tightness between the second damping pad 42 and the second placement groove 14 good, and preventing the second damping pad 42 and the second placement groove 14 from separating from each other.

[0027] Furthermore, as Figure 2 , the widths of both the first placement groove 13 and the second placement groove 14 are greater than 0 mm and less than or equal to 10 mm; the thicknesses of both the first damping pad 41 and the second damping pad 42 are greater than 0 mm and less than or equal to 10 mm. Specifically, the widths of the first placement groove 13 and the second placement groove 14 can specifically be 1 mm, 5 mm, 10 mm, etc. If the widths of the first placement groove 13 and the second placement groove 14 are too large, the overall strength of the drill bit body 1 will become smaller; the thicknesses of the first damping pad 41 and the second damping pad 42 can specifically be 1 mm, 5 mm, 10 mm, etc. If the thicknesses of the first damping pad 41 and the second damping pad 42 are too large, the overall strength of the drill bit body 1 will become smaller.

[0028] Furthermore, as Figure 1-2 , the outer sides of both the first damping pad 41 and the second damping pad 42 are lower than the outer periphery of one end of the drill bit body 1. Specifically, it is equivalent to that the lengths of both the first damping pad 41 and the second damping pad 42 are relatively small, which is convenient for preventing the first damping pad 41 and the second damping pad 42 from being exposed outside one end of the drill bit body 1, thereby preventing both the first damping pad 41 and the second damping pad 42 from contacting the hole wall of the workpiece to be machined during the cutting process, and thus preventing the drill bit structure of the present application from being subjected to a large resistance during the cutting process. Since the lengths of the first damping pad 41 and the second damping pad 42 will increase when they play a vibration damping role (i.e., when being squeezed), it is therefore preferable that the outer sides of both the first damping pad 41 and the second damping pad 42 are lower than the outer periphery of one end of the drill bit body 1 by a certain distance.

[0029] Furthermore, as Figure 2, there is a first spacing between the first damping pad 41 and the outer circular blade 2, and a second spacing between the second damping pad 42 and the central blade 3. Specifically, the first spacing facilitates preventing the first damping pad 41 from directly contacting the outer circular blade 2, which is equivalent to mounting the outer circular blade 2 on the drill body 1 with a relatively hard texture, ensuring good mounting stability of the outer circular blade 2; the second spacing facilitates preventing the second damping pad 42 from directly contacting the central blade 3, which is equivalent to mounting the central blade 3 on the drill body 1 with a relatively hard texture, ensuring good mounting stability of the central blade 3.

[0030] Furthermore, as Figure 2 , both the first spacing and the second spacing are greater than 0 mm and less than or equal to 10 mm. Specifically, the first spacing and the second spacing can specifically be 1 mm, 5 mm or 10 mm, etc. If the first spacing and the second spacing are too large, it will result in too large a distance between the first damping pad 41 and the outer circular blade 2, and at the same time, it will also result in too large a distance between the second damping pad 42 and the central blade 3, ultimately leading to a deterioration in the vibration damping effect of the first damping pad 41 and the second damping pad 42.

[0031] This embodiment also provides a shallow hole drill, which includes a drill bit structure of this embodiment, and further includes a shank connected to the other end of the drill body 1. Specifically, the shank is used to cooperate with relevant drilling equipment, so as to facilitate the cooperation between the shallow hole drill of this application and the relevant drilling equipment. Among them, the shank can be a triangular shank, a hexagonal shank, etc.

[0032] The above embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A drill bit structure, characterized in that, Comprising: The drill bit body; An outer circular blade and a center blade respectively rotatably connected to both sides of one end of the drill bit body; Both are provided in the first chip fluting and the second chip fluting of the drill bit body, the first chip fluting communicates with the outer circular blade, and the second chip fluting communicates with the center blade; A first damping pad and a second damping pad respectively connected to both sides of one end of the drill bit body, the first damping pad is correspondingly arranged with the outer circular blade, and the second damping pad is correspondingly arranged with the center blade.

2. The drill bit structure according to claim 1, characterized in that It further includes a first placement groove and a second placement groove respectively provided on both sides of one end of the drill bit body, the first damping pad is located in the first placement groove, the second damping pad is located in the second placement groove, the first placement groove is correspondingly arranged with the outer circular blade, and the second placement groove is correspondingly arranged with the center blade.

3. The drill bit structure according to claim 2, characterized in that, The width of the first placement groove is smaller than the thickness of the first damping pad, and the width of the second placement groove is smaller than the thickness of the second damping pad.

4. A drill bit structure according to claim 3, characterized in that, The width of the first placement groove and the width of the second placement groove are both greater than 0mm and both less than or equal to 10mm; the thickness of the first damping pad and the thickness of the second damping pad are both greater than 0mm and both less than or equal to 10mm.

5. A drill bit structure according to any one of claims 1-4, characterized in that The outer sides of the first damping pad and the second damping pad are both lower than the outer periphery of one end of the drill bit body.

6. A drill bit structure according to any one of claims 1-4, characterized in that, There is a first spacing between the first damping pad and the outer circular blade, and a second spacing between the second damping pad and the center blade.

7. A drill bit structure according to claim 6, characterized in that, Both the first spacing and the second spacing are greater than 0mm and both less than or equal to 10mm.

8. A shallow hole drill, characterized in that, Comprising a drill bit structure according to any one of claims 1-7, and further comprising a shank portion connected to the other end of the drill bit body.

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