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 drill bits. The center cutting blade is connected to one end of the drill bit body; the outer circle cutting blade is radially and movably locked and connected to one end of the drill bit body; 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 center cutting blade, and the second chip groove is communicated with the outer circle cutting blade. The utility model has the technical effects that the radial adjustment performance of the outer circle cutting blade is good, and holes with different hole diameters can be conveniently processed.

Description

Technical Field

[0001] The utility model relates to a drill bit, in particular to a drill bit structure and a shallow hole drill. Background Art

[0002] A shallow hole drill, also known as a U-drill or a brute-force drill, is generally used for machining holes with a hole depth less than 3 times the hole diameter. However, in the case of high stability of the shallow hole drill, it can machine deep holes 5 times the diameter. Shallow hole drills are commonly used in automatic equipment such as numerical control machine tools, machining centers, and turret lathes, and have the advantage of high drilling efficiency.

[0003] Chinese Invention Patent, Publication No.: CN117182155A, Publication Date: December 8, 2023, discloses a indexable shallow hole drill. A first guiding and avoiding structure is provided at the top end of the first spiral chip flute. The first guiding and avoiding structure includes a first guiding surface extending downward along the outer circumferential surface of the central blade mounting groove and a second guiding surface extending downward along a part of the first expanded angle surface. The first guiding surface is a straight surface and its width gradually becomes smaller from top to bottom. The second guiding surface includes a guiding straight surface and a guiding curved surface. The inner end of the first guiding surface is connected to the inner end of the second guiding surface. The outer ends of the first guiding surface and the second guiding surface are both connected to the inside of the first spiral chip flute to form a groove space. This invention improves the cutting performance of the shallow hole drill, improves the stability of the cutting process, realizes the control of the force direction during the cutting process, solves the problem of chip jamming and clogging at the drill bit body, guides the formation and discharge of chips, controls the movement trajectory and direction of chips, improves the stiffness of the drill body, increases the chip discharge space, etc., so as to greatly improve the drilling quality and meet the high-quality processing requirements of users. Its disadvantage is that the radial adjustment performance of its peripheral blades is poor, and it is not convenient to machine holes with different diameters. Summary of the Utility Model

[0004] Utility Model Purpose: The purpose of the present utility model is to provide a drill bit structure with good radial adjustment performance of its outer circular cutting blade, which is convenient for machining holes with different diameters; another purpose of the present utility model is to provide a shallow hole drill.

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

[0006] A drill bit body;

[0007] A central cutting blade connected to one end of the drill bit body;

[0008] An outer circular cutting blade radially movably and lockingly connected to one end of the drill bit body;

[0009] A first chip flute and a second chip flute are both provided on the drill bit body. The first chip flute is communicated with the central cutting blade, and the second chip flute is communicated with the outer circular cutting blade.

[0010] Optionally, it further includes:

[0011] An oblong hole provided at one end of the drill bit body

[0012] A fastener that mates with the oblong hole

[0013] Wherein, the outer circular cutting blade is tightly connected to one end of the drill bit body through the fastener

[0014] Optionally, the fastener includes a screw and a nut that are threadedly connected to each other. The screw passes through the outer circular cutting blade and the oblong hole, and the nut abuts against one end of the drill bit body

[0015] Optionally, the screw includes a head, a guiding section, and a threaded section that are connected in sequence. The head abuts against the outer circular cutting blade, the guiding section passes through the outer circular cutting blade and the oblong hole, and the threaded section is threadedly connected to the nut

[0016] Optionally, one end face of the head away from the guiding section is not higher than the end face of the outer circular cutting blade

[0017] Optionally, it further includes an adjusting gasket. One side of the adjusting gasket abuts against one end of the drill bit body, and the other side of the adjusting gasket abuts against the outer circular cutting blade

[0018] Optionally, the shapes of the first chip removal groove and the second chip removal groove are both spiral

[0019] A shallow hole drill includes a drill bit structure and further includes a shank connected to the other end of the drill bit body

[0020] Beneficial effects: The outer circular cutting blade is mainly used for machining the outer circular part of the hole. Since the outer circular cutting blade is radially movably and tightly connected to one end of the drill bit body, it is convenient to radially adjust the position of the outer circular cutting blade, thereby facilitating the adjustment of the distance between the outer circular cutting blade and the center cutting blade, and further facilitating the machining of holes with different diameters Description of the Drawings

[0021] Figure 1 One of the structural schematic diagrams of a shallow hole drill according to Embodiment 1 of the present invention

[0022] Figure 2 is Figure 1 The partial view of A in

[0023] Figure 3 Two of the structural schematic diagrams of a shallow hole drill according to Embodiment 1 of the present invention

[0024] Figure 4 The structural schematic diagram of the screw according to Embodiment 1 of the present invention

[0025] Figure 5 Schematic diagram of a partial structure of a short-hole drill for Embodiment 1 of the present utility model;

[0026] Figure 6 is Figure 5 partial view of B in

[0027] In the figure: 1, drill bit body; 11, first chip fluting; 12, second chip fluting; 13, kidney-shaped hole; 2, center cutting blade; 3, outer circle cutting blade; 4, fastener; 41, screw; 411, head; 412, guiding block; 413, threaded part; 42, nut; 5, adjusting gasket; 6, shank. Detailed implementation manners

[0028] To make the technical solution of the present utility model clearer, the following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1

[0030] As Figure 2-3 , this embodiment provides a drill bit structure, including: drill bit body 1; center cutting blade 2 connected to one end of drill bit body 1; outer circle cutting blade 3 radially movably and lockingly connected to one end of drill bit body 1; first chip fluting 11 and second chip fluting 12 both arranged on drill bit body 1, the first chip fluting 11 is communicated with the center cutting blade 2, and the second chip fluting 12 is communicated with the outer circle cutting blade 3.

[0031] Specifically, the drill bit body 1 is used to carry the center cutting blade 2, outer circle cutting blade 3, first chip fluting 11 and second chip fluting 12, etc.; the center cutting blade 2 is mainly used to machine the center part of the hole. The center cutting blade 2 is preferably detachably connected to one end of the drill bit body 1, and four cutting edges are arranged on one side of the center cutting blade 2. When a certain cutting edge is worn, the cutting edge can be changed by rotating in the same side, and it can be changed four times in total, effectively improving the service life of the center cutting blade 2; the outer circle cutting blade 3 is mainly used to machine the outer circle part of the hole. Since the outer circle cutting blade 3 is radially movably and lockingly connected to one end of the drill bit body 1, it is convenient to radially adjust the position of the outer circle cutting blade 3, so as to facilitate adjusting the distance between the outer circle cutting blade 3 and the center cutting blade 2, and further facilitate machining holes with different diameters. Among them, four cutting edges are preferably arranged on one side of the outer circle cutting blade 3. When a certain cutting edge is worn, the cutting edge can be changed by rotating in the same side, and it can be changed four times in total, effectively improving the service life of the outer circle cutting blade 3; the first chip fluting 11 is used to discharge the waste chips from the center cutting blade 2; the second chip fluting 12 is used to discharge the waste chips from the outer circle cutting blade 3.

[0032] Furthermore, as Figure 2 and 6, further comprising: a waist-shaped hole 13 provided at one end of the drill bit body 1, and a fastener 4 engaged with the waist-shaped hole 13; wherein, the outer circular cutting blade 3 is locked and connected to one end of the drill bit body 1 through the fastener 4. Specifically, the waist-shaped hole 13 is used to cooperate with the fastener 4, facilitating the fastener 4 to drive the outer circular cutting blade 3 to move radially in the waist-shaped hole 13, thereby facilitating the radial adjustment of the position of the outer circular cutting blade 3, and further facilitating the adjustment of the distance between the outer circular cutting blade 3 and the central cutting blade 2 to facilitate the machining of holes with different diameters. Among them, the radial adjustment distance of the outer circular cutting blade 3 is greater than 0 mm and less than or equal to 4 mm. If the radial adjustment distance of the outer circular cutting blade 3 is too large, it is easy to cause the connection area between the outer circular cutting blade 3 and one end of the drill bit body 1 to be too small, resulting in poor connection stability of the outer circular cutting blade 3; the fastener 4 may specifically include a screw 41, a nut 42, etc.

[0033] Further, as Figure 3 , the fastener 4 includes a screw 41 and a nut 42 that are threadedly connected to each other. The screw 41 passes through the outer circular cutting blade 3 and the waist-shaped hole 13, and the nut 42 abuts against one end of the drill bit body 1. Specifically, the screw 41 cooperates with the nut 42 to facilitate locking and connecting the outer circular cutting blade 3 to one end of the drill bit body 1.

[0034] Further, as Figure 4 , the screw 41 includes a head 411, a guiding stop 412, and a threaded portion 413 that are sequentially connected. The head 411 abuts against the outer circular cutting blade 3, the guiding stop 412 passes through the outer circular cutting blade 3 and the waist-shaped hole 13, and the threaded portion 413 is threadedly connected to the nut 42. Specifically, the head 411, the guiding stop 412, and the threaded portion 413 are used to jointly form the screw 41. The head 411, the guiding stop 412, and the threaded portion 413 are preferably integrally formed and connected to ensure the integrity of the screw 41; since the head 411 abuts against the outer circular cutting blade 3 and the threaded portion 413 is threadedly connected to the nut 42, it is convenient to lock and connect the outer circular cutting blade 3 and one end of the drill bit body 1; since the guiding stop 412 passes through the outer circular cutting blade 3 and the waist-shaped hole 13, it is convenient for the guiding stop 412 to drive the outer circular cutting blade 3 to move radially in the waist-shaped hole 13, thereby facilitating the radial adjustment of the position of the outer circular cutting blade 3, and further facilitating the adjustment of the distance between the outer circular cutting blade 3 and the central cutting blade 2 to facilitate the machining of holes with different diameters. Among them, the diameter of the guiding stop 412 is preferably greater than the major diameter of the threaded portion 413, facilitating the formation of a stepped portion between the guiding stop 412 and the threaded portion 413, thereby facilitating the stepped portion to exert a certain axial limiting effect on the nut 42.

[0035] Further, as Figure 3-4, the end face of the head 411 away from the guiding block 412 is not higher than the end face of the external circular cutting blade 3. Specifically, the end face of the head 411 away from the guiding block 412 can be lower than the end face of the external circular cutting blade 3, or the end face of the head 411 away from the guiding block 412 can be flush with the end face of the external circular cutting blade 3, which is convenient for ensuring the flatness of the end face of the external circular cutting blade 3. The end face of the head 411 away from the guiding block 412 should not be higher than the end face of the external circular cutting blade 3. Otherwise, the head 411 higher than the end face of the external circular cutting blade 3 will block the waste chips cut by the external circular cutting blade 3, resulting in poor chip removal performance.

[0036] Furthermore, as Figure 3 , it further includes an adjusting gasket 5. One side of the adjusting gasket 5 abuts against one end of the drill bit body 1, and the other side of the adjusting gasket 5 abuts against the external circular cutting blade 3. Specifically, the adjusting gasket 5 is filled between one end of the drill bit body 1 and the external circular cutting blade 3 to prevent a gap from being generated between one end of the drill bit body 1 and the external circular cutting blade 3, ensuring good installation stability of the external circular cutting blade 3. When the external circular cutting blade 3 is adjusted radially, the gap between one end of the drill bit body 1 and the external circular cutting blade 3 changes. An adjusting gasket 5 with a suitable thickness can be selected for filling. Among them, the material of the adjusting gasket 5 can be a copper alloy composite material, a silver alloy composite material, etc., with good heat conduction performance, to ensure the heat dissipation performance of the drill bit structure of the present application.

[0037] Furthermore, as Figure 3 , the shapes of the first chip removal groove 11 and the second chip removal groove 12 are both spiral. Specifically, the spiral first chip removal groove 11 and the second chip removal groove 12 are both used to increase the capacity of the chip removal groove, thereby increasing the chip removal performance, and are also convenient for discharging the waste chips in the direction opposite to the drilling direction.

[0038] This embodiment also provides a shallow hole drill, including a drill bit structure in this embodiment, and further including a shank 6 connected to the other end of the drill bit body 1. Specifically, the shank 6 is used to cooperate with relevant drilling equipment, so as to facilitate the cooperation between the shallow hole drill of the present application and the relevant drilling equipment. Among them, the shank 6 can be a triangular shank, a hexagonal shank, etc.

[0039] The above embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A drill bit structure, characterized in that, Comprising: The drill bit body; The center cutting blade connected to one end of the drill bit body; The outer cutting blade radially movably and lockingly connected to one end of the drill bit body; The first chip removal groove and the second chip removal groove both provided on the drill bit body, the first chip removal groove communicating with the center cutting blade, and the second chip removal groove communicating with the outer cutting blade.

2. The drill bit structure according to claim 1, characterized in that, Further comprising: The waist-shaped hole provided at one end of the drill bit body; The fastener cooperating with the waist-shaped hole; Wherein, the outer cutting blade is lockingly connected to one end of the drill bit body through the fastener.

3. The drill bit structure according to claim 2, wherein, The fastener includes a screw and a nut threadedly connected to each other. The screw penetrates through the outer cutting blade and the waist-shaped hole, and the nut abuts against one end of the drill bit body.

4. A drill bit structure according to claim 3, characterized in that, The screw includes a head, a guiding stop, and a threaded portion connected in sequence. The head abuts against the outer cutting blade, the guiding stop penetrates through the outer cutting blade and the waist-shaped hole, and the threaded portion is threadedly connected to the nut.

5. A drill bit structure according to claim 4, characterized in that, One end face of the head away from the guiding stop is not higher than the end face of the outer cutting blade.

6. A drill bit structure according to any one of claims 1-5, characterized in that, Further comprising an adjusting gasket. One side of the adjusting gasket abuts against one end of the drill bit body, and the other side of the adjusting gasket abuts against the outer cutting blade.

7. A drill bit structure according to any one of claims 1-5, characterized in that, The shapes of the first chip removal groove and the second chip removal groove are both spiral.

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 connected to the other end of the drill bit body.

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