Double-section auger bit

Abstract

The utility model relates to the technical field of drill bits, in particular to a double-section auger bit which comprises a drill rod and a shaft body arranged at the end of the drill rod, an upper drilling part is formed at the bottom end of the shaft body, a plurality of groups of lower drilling parts used for cutting are arranged at the bottom end of the upper drilling part, and inner cutting edges used for internal cutting are nested at the end parts of the lower drilling parts. A cutting sleeve is arranged outside the lower drilling part in a sleeving mode, a plurality of sets of outer cutting edge grooves are formed in the surface of the cutting sleeve, an outer cutting edge used for outer ring cutting is arranged inside each set of outer cutting edge grooves in a sleeving mode, and a double-section and continuous cutting component is formed in an inner and outer cutting mode, so that the cutting effect is guaranteed, meanwhile, chippings are guided, and the cutting efficiency is improved. And therefore, the chippings can be discharged.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a two-stage support drill. Background Technology

[0002] The main features of the auger are fast cutting speed, high efficiency, and less clogging. It is suitable for processing harder materials such as steel, cement, glass and ceramics.

[0003] Currently, open-type support drills generate a large amount of machining debris during use. This debris is discharged through the drill bit's threads and the holes it creates. However, due to deviations in the drill bit's operation, the holes produced are not perfectly regular and have outward deviations, resulting in a gap between the drill bit and the hole. Some of the debris generated after cutting enters this gap, affecting the smoothness of the drill bit's rotation. To address this, we propose a two-stage support drill. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a two-stage support drill, which solves the problem that due to the deviation of the drill bit operation, there is a certain degree of gap between the drill bit and the hole, and some of the debris generated after cutting will enter the gap, thus affecting the smoothness of the drill bit rotation.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a two-stage support screw drill, including a drill rod and a shaft body disposed at the end of the drill rod. The bottom end of the shaft body is formed with an upper drill hole. The bottom end of the upper drill hole is provided with several sets of lower drill holes for cutting. The end of the lower drill hole is nested with an inner cutting edge for internal cutting. A cutting sleeve is sleeved on the outside of the lower drill hole. Several sets of outer cutting edge grooves are opened on the surface of the cutting sleeve, and an outer cutting edge for outer ring cutting is sleeved inside each set of outer cutting edge grooves.

[0006] Preferably, at least two sets of lower drilling portions are provided, and the lower drilling portions are arranged at equal intervals at the bottom of the upper drilling portions. The ends of the lower drilling portions are provided with slots for the nesting of internal cutting edges.

[0007] Preferably, the outer diameter of the lower drilled portion is consistent with the inner diameter of the cutting sleeve, and the outer diameter of the cutting sleeve is consistent with the outer diameter of the upper drilled portion.

[0008] Preferably, the surface of the lower drilled hole is provided with a fixing component for connecting the cutting sleeve, and the cutting sleeve is fixed to the outer surface of the upper drilled hole by the fixing component.

[0009] Preferably, the fixing component includes a cutting sleeve fixing post disposed on the surface of the lower drilled hole, and a fixing post connecting groove formed on the surface of the cutting sleeve to cooperate with the cutting sleeve fixing post, wherein the cutting sleeve fixing post and the fixing post connecting groove are nested together.

[0010] Preferably, each set of external cutting edge grooves has an inclined chip removal guide groove on its back side, and the chip removal guide groove simultaneously passes through the shaft, the upper drilled part and the lower drilled part.

[0011] Preferably, a positioning tip is provided at the center of the bottom end of the lower drilled hole, and the positioning tip has a conical design.

[0012] Preferably, the bottom surface of the cutting sleeve is provided with several sets of inclined notches, the number of inclined notches being consistent with the number of external cutting grooves, and the end of each set of notches extending to the opening position of the external cutting groove.

[0013] Compared with the prior art, the beneficial effects that this utility model can achieve are:

[0014] 1. In this utility model, the end of the lower drilled hole is nested with an inner cutting edge for internal cutting, and a cutting sleeve is sleeved on the outside of the lower drilled hole. An outer cutting edge groove is opened on the surface of the cutting sleeve, and an outer cutting edge for outer ring cutting is sleeved inside the outer cutting edge groove. Through the internal and external cutting, a two-segment and continuous cutting component is formed, thereby ensuring the cutting effect while guiding the chips, thus ensuring the discharge of chips. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a three-dimensional side view structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the specific structure of the drilling part in this utility model;

[0018] Figure 4 This is an exploded view of the drilled section in this utility model.

[0019] The components are: 1. Drill rod; 2. Shaft; 3. Upper drilling section; 4. Lower drilling section; 5. Inner cutting edge; 6. Cutting sleeve; 7. Outer cutting edge groove; 8. Outer cutting edge; 9. Cutting sleeve fixing post; 10. Fixing post connecting groove; 11. Chip removal guide groove; 12. Positioning tip. Detailed Implementation

[0020] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0021] Example:

[0022] Please see Figure 1 - Figure 4 A two-stage support screw drill includes a drill rod 1 and a shaft 2 disposed at the end of the drill rod 1. The bottom end of the shaft 2 is formed with an upper drill hole 3. The bottom end of the upper drill hole 3 is provided with several sets of lower drill holes 4 for cutting. The end of the lower drill hole 4 is nested with an inner cutting edge 5 for internal cutting. A cutting sleeve 6 is sleeved on the outside of the lower drill hole 4. Several sets of outer cutting edge grooves 7 are opened on the surface of the cutting sleeve 6, and an outer cutting edge 8 for outer ring cutting is sleeved inside each set of outer cutting edge grooves 7.

[0023] At least two sets of lower drilling sections 4 are provided, and the lower drilling sections 4 are arranged at equal intervals at the bottom of the upper drilling section 3. The ends of the lower drilling sections 4 are provided with slots for the inner cutting edge 5 to be nested.

[0024] A fixing assembly for connecting the cutting sleeve 6 is provided on the surface of the lower drilling section 4. The cutting sleeve 6 is fixed to the outer surface of the upper drilling section 3 by the fixing assembly. The fixing assembly includes a cutting sleeve fixing post 9 provided on the surface of the lower drilling section 4, and a fixing post connecting groove 10 formed on the surface of the cutting sleeve 6 to cooperate with the cutting sleeve fixing post 9. The cutting sleeve fixing post 9 and the fixing post connecting groove 10 are nested together. With the cooperation of the cutting sleeve fixing post 9 and the fixing post connecting groove 10, the outer diameter of the lower drilling section 4 is consistent with the inner diameter of the cutting sleeve 6, and the outer diameter of the cutting sleeve 6 is consistent with the outer diameter of the upper drilling section 3. The cutting sleeve 6 is stably fixed to the outside of the lower drilling section 4 and supported by the lower drilling section 4, thereby maintaining a stable relative positional relationship. At the same time, the cutting sleeve 6 can be removed from the outside of the lower drilling section 4 by rotation, thereby facilitating the replacement of the cutting sleeve 6. After nesting connection, the diameter of the cutting sleeve 6 is consistent with that of the upper drilling section 3, thereby forming a drill hole of the same specification.

[0025] Each set of external cutting edge grooves 7 has an inclined chip removal guide groove 11 on its back side. The chip removal guide groove 11 passes through the shaft 2, the upper drilling part 3 and the lower drilling part 4 simultaneously. During rotation, the inclined chip removal guide groove 11 can quickly guide the chips out of the drill hole, thereby accelerating the chip removal efficiency and preventing the chips from remaining in the drill hole for a long time, which would affect the normal drilling.

[0026] A positioning tip 12 is provided at the center of the bottom end of the lower drilling section 4. The positioning tip 12 is tapered. When the tapered positioning tip 12 comes into contact with the area to be drilled, it can be embedded in the area to be drilled, thereby fixing the initial position and ensuring the accuracy of the drilling position.

[0027] The bottom surface of the cutting sleeve 6 is provided with several sets of inclined notches. The number of inclined notches is consistent with the number of external cutting edge grooves 7. The end of each set of notches extends to the opening position of the external cutting edge groove 7. The inclined notches will expose the cutting edge of the external cutting edge 8 set in the external cutting edge groove 7, so that the external cutting edge 8 can complete the cutting during rotation.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A two-stage drill bit, characterized in that: The invention comprises a drill rod (1) and a shaft body (2) arranged at the end of the drill rod (1); an upper drilling portion (3) is formed at the bottom end of the shaft body (2); a plurality of groups of lower drilling portions (4) for cutting are arranged at the bottom end of the upper drilling portion (3); an inner cutting edge (5) for internal cutting is embedded at the end of the lower drilling portion (4); a cutting sleeve (6) is sleeved on the outside of the lower drilling portion (4); a plurality of groups of external cutting edge grooves (7) are formed on the surface of the cutting sleeve (6); and an outer cutting edge (8) for external ring cutting is sleeved inside each group of external cutting edge grooves (7).

2. A two-stage drilling rig according to claim 1, characterized in that: At least two groups of the lower drilling portions (4) are provided, and the lower drilling portions (4) are arranged at equal intervals at the bottom of the upper drilling portion (3), and the ends of the lower drilling portions (4) are provided with slots for the inner cutting edges (5) to be nested.

3. A two-stage drilling rig according to claim 1, characterized in that: The outer diameter of the lower drilling portion (4) is consistent with the inner diameter of the cutting sleeve (6), and the outer diameter of the cutting sleeve (6) is consistent with the outer diameter of the upper drilling portion (3).

4. A two-stage drilling rig according to claim 3, characterized in that: The surface of the lower drilling portion (4) is provided with a fixing assembly connected to a cutting sleeve (6), and the cutting sleeve (6) is fixed to the outer surface of the upper drilling portion (3) via the fixing assembly.

5. A two-stage drilling rig according to claim 4, characterized in that: The fixing assembly comprises a cutting sleeve fixing column (9) arranged on the surface of the lower drilling portion (4), and a fixing column connecting groove (10) provided on the surface of the cutting sleeve (6) and cooperating with the cutting sleeve fixing column (9), wherein the cutting sleeve fixing column (9) and the fixing column connecting groove (10) are nested and connected.

6. A two-stage drilling rig according to claim 5, characterized in that: The back side of each group of the outer cutting edge grooves (7) is provided with an inclined chip removal guide groove (11), and the chip removal guide groove (11) synchronously penetrates the shaft body (2), the upper drilling portion (3) and the lower drilling portion (4).

7. A two-stage drilling rig according to claim 6, characterized in that: A positioning tip (12) is provided at the center of the bottom end of the lower drilling portion (4), and the positioning tip (12) is designed to be conical.

8. The two-stage drilling rig according to claim 7, characterized in that: The bottom surface of the cutting sleeve (6) is formed with a plurality of groups of inclined notches, the number of which is consistent with the number of the outer cutting edge grooves (7), and the ends of each group of notches extend to the opening position of the outer cutting edge groove (7).

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