High-speed deep hole drill bit

Abstract

The utility model is suitable for the field of drill bits, and provides a high-speed deep hole drill bit which comprises an outer drill bit and an inner mandrel which are combined in an inserted mode. A cavity used for allowing the inner core shaft to be inserted therein extends in the axis direction of the outer drill bit. A drill tip is arranged at the end part of the inner core shaft; when the drill bit is in a positioning state, the drill tip protrudes out of the end of the outer drill bit; when the drill bit is in a tapping state, the drill tip is recessed at the end of the outer drill bit; and a drill handle is arranged on the same side of the outer drill bit and the inner core shaft, so that the position of the drill tip can be adjusted (the drill tip is in an extending state in a positioning stage and is in a contracting state in a high-speed drilling state), the drill tip can be effectively protected, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a high-speed deep-hole drill bit. Background Art

[0002] For a drill bit for drilling wood materials, accurate positioning of the drilling position is an optimal option. Therefore, for a common drill bit applied to wood materials, its end has a drill tip for positioning. During the drilling positioning process of this drill bit, the drill tip is positioned at the center position of the drill hole. Due to the positioning effect of the drill tip, the drill bit is not easily deviated from its original position during the drilling process.

[0003] However, during the process of long-time and high-speed drilling, the drill tip is subjected to a large force and will be greatly worn.

[0004] In summary, it is obvious that the prior art has inconveniences and defects in actual use, so it is necessary to improve. Content of the Utility Model

[0005] Aiming at the above defects, the purpose of the utility model is to provide a high-speed deep-hole drill bit, which can adjust the position of the drill tip (in the extended state during the positioning stage and in the retracted state during the high-speed drilling state), and can effectively protect the drill tip to increase the service life of the drill bit.

[0006] To achieve the above purpose, the utility model provides a high-speed deep-hole drill bit, which includes an outer drill bit and an inner core shaft that are inserted and combined; a cavity for inserting the inner core shaft extends in the axial direction of the outer drill bit; a drill tip is provided at the end of the inner core shaft; when the drill bit is in the positioning state, the drill tip protrudes from the end of the outer drill bit; when the drill bit is in the advancing state, the drill tip is recessed from the end of the outer drill bit; drill handles are provided on the same side of the outer drill bit and the inner core shaft.

[0007] According to the high-speed deep-hole drill bit of the utility model, the drill handle diameters of the outer drill bit and the inner core shaft are the same.

[0008] According to the high-speed deep-hole drill bit of the utility model, at least one set of positioning grooves for cooperating with an electric drill chuck are provided on the drill handles of the outer drill bit and the inner core shaft, and the positioning grooves of the outer drill bit and the inner core shaft in the two states always correspond.

[0009] According to the high-speed deep-hole drill bit of the utility model, a positioning structure is provided between the outer drill bit and the inner core shaft, which is used to stabilize the state where the drill tip protrudes from the end of the outer drill bit.

[0010] According to the high-speed deep-hole drill bit of the utility model, the positioning structure includes an external thread provided on the inner core shaft and an internal thread provided on the side wall of the cavity of the outer drill bit.

[0011] According to the high-speed deep-hole drill bit of the present utility model, a convex block is provided at the side end of the drill shank of the inner core shaft, and an external thread is provided on the outer peripheral surface of the convex block; a slot for cooperating with the convex block is provided in the drill shank of the outer drill bit, and an external thread is provided on the inner wall of the slot.

[0012] The present utility model provides a high-speed deep-hole drill bit, which includes an outer drill bit and an inner core shaft that are inserted and combined; the outer peripheral surface of the outer drill bit is the same as that of a traditional drill bit, including a spiral chip flute and a land. The inner core shaft is a slender cylindrical or prismatic structure. A cavity for inserting the inner core shaft extends in the axial direction of the outer drill bit, and the structure of the cavity corresponds to the shape of the inner core shaft. A drill tip is provided at the end of the inner core shaft, and the shape of the drill tip can be provided with cutting edges according to needs, or no cutting edges are provided; when the drill bit is in the positioning state, at this time, the drill bit needs to be positioned, and the drill tip protrudes from the end of the outer drill bit, and the protruding drill tip can abut against the center position of the drilled hole to achieve positioning. When the drill bit is in the advancing state, at this time, the drill bit is in a high-speed rotating state, and the grinding force borne by the drill tip is large. The drill tip is recessed inside the end of the outer drill bit, and the drill tip is wrapped by the outer wall of the outer drill bit, which can reduce the grinding force it receives. The present utility model can adjust the position of the drill tip (in the extended state during the positioning stage and in the contracted state during the high-speed drilling state), which can effectively protect the drill tip and increase the service life of the drill bit. Brief Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is an exploded schematic diagram of the present utility model;

[0015] Figure 3 is a cross-sectional view of the present utility model;

[0016] In the figure, 1 - outer drill bit, 2 - inner core shaft, 21 - drill tip, 3 - drill shank, 31 - convex block, 32 - slot. Detailed Description of the Embodiment

[0017] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0018] See Figure 1 、 Figure 2 and Figure 3 , the present utility model provides a high-speed deep-hole drill bit, which includes an outer drill bit 1 and an inner core shaft 2 that are inserted and combined; the outer peripheral surface of the outer drill bit 1 is the same as that of a traditional drill bit, including a spiral chip flute and a land. The inner core shaft 2 is a slender cylindrical or prismatic structure.

[0019] An axial direction of the outer drill bit 1 extends with a cavity for inserting the inner core shaft 2, and a structure of the cavity corresponds to a shape of the inner core shaft 2. A drill tip 21 is arranged at an end of the inner core shaft 2, and a cutting edge of the drill tip 21 can be arranged according to needs, while in this embodiment, no cutting edge is arranged;

[0020] The drill bit is in a positioning state. At this time, the drill bit needs to be positioned. The drill tip 21 protrudes from an end of the outer drill bit 1, about 1 cm higher than a drill tip position of the outer drill bit 1. The protruding drill tip 21 can abut against a center position of the drilled hole to achieve positioning.

[0021] The drill bit is in a tapping state. At this time, the drill bit is in a high-speed rotation state, and the grinding force borne by the drill tip is large. The drill tip 21 is recessed from an end of the outer drill bit 1, about 1 cm lower than a drill tip position of the outer drill bit 1. The drill tip 21 is wrapped by an outer wall of the outer drill bit 1, and the received grinding force can be reduced.

[0022] A drill handle 3 is arranged on the same side of the outer drill bit 1 and the inner core shaft 2. During installation, a chuck of an electric drill clamps the drill handles 3 of both.

[0023] Preferably, in order to facilitate the clamping work of the electric drill chuck, a diameter of the drill handle 3 of the outer drill bit 1 and the inner core shaft 2 of the present utility model is the same. At the same time, in order to optimize a control and positioning effect of the electric drill chuck on the drill handle 3 and avoid relative rotation of the outer drill bit 1 and the inner core shaft 2 after being clamped, at least one set of positioning grooves 31 for cooperating with the electric drill chuck are arranged on the drill handles 3 of the outer drill bit 1 and the inner core shaft 2, and the positioning grooves 31 of the outer drill bit 1 and the inner core shaft 2 in two states always correspond.

[0024] In addition, a positioning structure is arranged between the outer drill bit 1 and the inner core shaft 2 of the present utility model, and is used for stabilizing a state that the drill tip 21 protrudes from an end of the outer drill bit 1, and avoiding shrinkage of the drill tip 21 due to excessive external force during the drilling process. The positioning structure includes an external thread arranged on the inner core shaft 2 and an internal thread arranged on a side wall of a cavity of the outer drill bit 1.

[0025] Furthermore, a convex block 31 is arranged at a side end of the drill handle 3 of the inner core shaft 2 of the present utility model, and the external thread is arranged on an outer peripheral surface of the convex block 31; a slot 32 for cooperating with the convex block 31 is arranged in the drill handle 3 of the outer drill bit 1, and the external thread is arranged on an inner wall of the slot 32. The convex block 31 and the slot 32 cooperate to achieve an axial positioning effect of the inner core shaft 2, and are used for defining a distance after the drill tip 21 protrudes.

[0026] During the use process of this drill bit, in the early stage of drilling positioning, the inner core shaft 2 is rotated (rotated relative to the outer drill bit 1) to expose the drill tip 21 (about 1 cm higher than the drill tip position of the outer drill bit 1). After the electric drill is clamped, the drilling work is carried out.

[0027] When the drilling reaches the predetermined depth (generally 2 cm) and before entering the high-speed drilling stage, remove the drill bit and rotate the inner core shaft 2 (rotate relative to the outer drill bit 1) so that the drill tip 21 contracts (about 1 cm lower than the drill tip position of the outer drill bit 1). After the electric drill is clamped, carry out high-speed advancing drilling work.

[0028] In summary, the present utility model provides a high-speed deep-hole drill bit, including an outer drill bit and an inner core shaft that are inserted and combined; the outer peripheral surface of the outer drill bit is the same as that of a traditional drill bit, including a spiral chip flute and a land. The inner core shaft is a slender cylindrical or prismatic structure. A cavity for inserting the inner core shaft extends in the axial direction of the outer drill bit, and the structure of the cavity corresponds to the shape of the inner core shaft. A drill tip is provided at the end of the inner core shaft, and the shape of the drill tip can be provided with a cutting edge according to needs or without a cutting edge; when the drill bit is in the positioning state, at this time, the drill bit needs to be positioned, and the drill tip protrudes from the end of the outer drill bit, and the protruding drill tip can abut against the center position of the drilling hole to achieve positioning. When the drill bit is in the advancing state, at this time, the drill bit is in a high-speed rotating state, and the grinding force borne by the drill tip is large. Concave the drill tip inside the end of the outer drill bit, and wrap the drill tip with the outer wall of the outer drill bit, which can reduce the grinding force it receives. The present utility model can adjust the position of the drill tip (in the extended state during the positioning stage and in the contracted state during the high-speed drilling state), which can effectively protect the drill tip and increase the service life of the drill bit.

[0029] Certainly, the present utility model can also have many other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A high-speed deep-hole drill bit, characterized in that, It includes an externally threaded drill bit and an inner mandrel that are plugged and combined; A cavity for inserting the inner mandrel is extended in the axial direction of the externally threaded drill bit; A drill tip is provided at the end of the inner mandrel; When the drill bit is in the positioning state, the drill tip protrudes outward from the end of the externally threaded drill bit; When the drill bit is in the advancing state, the drill tip is recessed inside the end of the externally threaded drill bit; Drill handles are provided on the same side of the externally threaded drill bit and the inner mandrel.

2. The high-speed deep-hole drill bit according to claim 1, characterized in that, The drill handles of the externally threaded drill bit and the inner mandrel have the same diameter.

3. The high-speed deep-hole drill bit according to claim 1 or 2, characterized in that, At least one set of positioning grooves for cooperating with an electric drill chuck are provided on the drill handles of the externally threaded drill bit and the inner mandrel; The positioning grooves of the externally threaded drill bit and the inner mandrel in the two states always correspond.

4. The high-speed deep-hole drill bit according to claim 1, characterized in that, A positioning structure is provided between the externally threaded drill bit and the inner mandrel, which is used to stabilize the state where the drill tip protrudes outward from the end of the externally threaded drill bit.

5. The high-speed deep-hole drill bit according to claim 4, characterized in that, The positioning structure includes an external thread provided on the inner mandrel and an internal thread provided on the side wall of the cavity of the externally threaded drill bit.

6. The high-speed deep-hole drill bit according to claim 1 or 5, characterized in that, A convex block is provided at the side end of the drill handle of the inner mandrel, and the external thread is provided on the outer peripheral surface of the convex block; A slot for cooperating with the convex block is provided inside the drill handle of the externally threaded drill bit, and the external thread is provided on the inner wall of the slot.

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