Single-blade spiral drill bit

Abstract

The utility model relates to a single-blade auger bit which comprises a connecting part, a rigid body is arranged at the front end of the connecting part, a single-blade tool bit part is arranged at the front end of the rigid body, and a drilling part is arranged in the center of the front end of the single-blade tool bit part. A tip part is arranged at the front end of the drilling part, an arc-shaped chip groove is formed in the rear end of the tip part, the rear end of the arc-shaped chip groove is connected with a spiral drilling groove, the spiral drilling groove is in a step shape, the diameter of the rear end of the drilling part is larger than that of the front end of the drilling part, and the whole cutter is convenient to disassemble and assemble through the arranged connecting part. The rigid body is arranged to ensure high rigidity of the tool, the tool bit and the body of the tool are reasonably designed to facilitate tapping, and the tip part is arranged to ensure that the tapping position of the tool is accurate and the tapping efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of single-edge drills, in particular to a single-edge spiral drill bit. Background Art

[0002] Milling cutters are mainly used for machining planes, steps, grooves, formed surfaces and cutting workpieces on milling machines, while drill bits are mainly used for drilling. Although in some cases, milling cutters can also be used for drilling, this is not their main purpose. The outer circle of a milling cutter has two cutting edges with a back angle, which can play a cutting role. However, drill bits are relatively long, and the two edges on the outer circle have no back angle, only to reduce friction. The two edges do not intersect. A drill bit is a linear cutting tool, and the structure of a drill bit mainly consists of a tip, a cutting edge, a cutting angle and a spindle, etc.

[0003] Patent No. CN201920024263.4 discloses a single-edge spiral milling cutter, which is connected through a tool shank and a tool head. The tool shank and the tool head are connected by a way of clamping through a groove and a protruding chuck. The tool head includes a spiral groove and a spiral cutting edge formed by the spiral groove. The spiral groove is an arc-shaped groove surface, its spiral angle is 45°, the depth of the spiral groove is 50% of the cutting edge diameter, and a secondary chip removal groove is arranged on the spiral cutting edge. The milling cutter has the advantages of smooth chip removal, low use cost, and the tool shank can be reused, etc. However, the single-edge spiral milling cutter has the following problems: firstly, it is difficult to open holes; secondly, the connection firmness of the rear connection part is poor, the structural rigidity is poor, it is easy to wear, and the service life is short. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art. By setting a connection part, the convenient disassembly and assembly of the whole tool can be realized. By setting a rigid body, the tool has strong rigidity. The tool head and the body of the tool are reasonably designed to facilitate hole opening. By setting a pointed end part, the technical problems of difficult hole opening, difficult fixation of hole opening positions, easy wear and short service life in the prior art are solved.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A single-edge spiral drill bit includes a connection part. A rigid body is arranged at the front end of the connection part. A single-edge cutter head is arranged at the front end of the rigid body. A drilling part is arranged at the center position of the front end of the single-edge cutter head;

[0007] Drilling part, a pointed end part is arranged at the front end of the drilling part. An arc-shaped chip removal groove is arranged at the rear end of the pointed end part. The arc-shaped chip removal groove is connected to a spiral drilling groove at the rear end. The spiral drilling groove is in a stepped shape, and the diameter of the rear end of the drilling part is larger than that of the front end.

[0008] As a preference, the connecting part includes an end handle, a limiting groove is arranged at the front end of the end handle, an installation body is arranged at the front end of the limiting groove, a convex arc is arranged at the front end of the installation body, and the diameter of the installation body is smaller than the structure of the rigid body.

[0009] As a preference, the front end of the rigid body is fixedly connected with a receiving part, the receiving part is of a trapezoidal platform structure, the diameter of the front end of the receiving part is larger than that of the rear end, and the diameter of the front end of the receiving part is the same as the diameter of the single-edge knife head.

[0010] As a preference, the single-edge knife head is spirally provided with a spiral chip removal groove, and a flat cutting edge peak is arranged on the outer side of the single-edge knife head.

[0011] As another preference, a base is arranged at the lower end of the drilling part, the rear end of the base is fixedly connected with the single-edge knife head, and the thickness of one end of the base is greater than that of the other end. The front end of the single-edge knife head is an inclined plane, the side wall of the base connected to the inclined position of the front end of the single-edge knife head close to the rigid body is thick, and the side wall of the base connected to the inclined position of the front end of the single-edge knife head far from the rigid body is thin. The connecting part is provided with a rigid body at the front end, the rigid body is provided with a single-edge knife head at the front end, and a drilling part is arranged at the center position of the front end of the single-edge knife head;

[0012] For the drilling part, a pointed end part is arranged at the front end of the drilling part, an arc-shaped chip removal groove is arranged at the rear end of the pointed end part, the arc-shaped chip removal groove is connected to a spiral drilling groove at the rear end, the spiral drilling groove is in a stepped shape, and the diameter of the rear end of the drilling part is larger than that of the front end.

[0013] As a preference, the connecting part includes an end handle, a limiting groove is arranged at the front end of the end handle, an installation body is arranged at the front end of the limiting groove, a convex arc is arranged at the front end of the installation body, and the diameter of the installation body is smaller than the structure of the rigid body.

[0014] As a preference, the front end of the rigid body is fixedly connected with a receiving part, the receiving part is of a trapezoidal platform structure, the diameter of the front end of the receiving part is larger than that of the rear end, and the diameter of the front end of the receiving part is the same as the diameter of the single-edge knife head.

[0015] As a preference, the single-edge knife head is spirally provided with a spiral chip removal groove, and a flat cutting edge peak is arranged on the outer side of the single-edge knife head.

[0016] As another preference, a base is arranged at the lower end of the drilling part, the rear end of the base is fixedly connected with the single-edge knife head, and the thickness of one end of the base is greater than that of the other end. The front end of the single-edge knife head is an inclined plane, the side wall of the base connected to the inclined position of the front end of the single-edge knife head close to the rigid body is thick, and the side wall of the base connected to the inclined position of the front end of the single-edge knife head far from the rigid body is thin.

[0017] The beneficial effects of the present utility model:

[0018] (1) In the present utility model, by providing a connecting portion, the connection and installation of the tool and the positioning are facilitated.

[0019] (2) In the present utility model, by providing a rigid body and reasonably designing the distribution area of the tool, the overall rigidity strength of the tool is improved.

[0020] (3) In the present utility model, by providing a single-edge cutter head portion, the chip removal after hole opening is ensured to be convenient, the wear of the drill bit is reduced, and the service life is prolonged.

[0021] (4) In the present utility model, by providing a pointed end portion, the fixed position of the hole opening is facilitated, the accuracy of the hole opening position is ensured, the hole opening is convenient, and the hole opening efficiency is high.

[0022] In summary, the tool has the advantages of strong structural rigidity, convenient connection and installation, high hole opening efficiency, and accurate hole opening position, and is particularly suitable for the technical field of single-edge drill bits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0025] Figure 2 It is a schematic diagram of the structure of the receiving portion in the present utility model.

[0026] Figure 3 It is a schematic diagram of the structure of the pointed end portion of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] As Figures 1 to 3 shown, the present utility model provides a single-edge spiral drill bit, including a connecting portion 1. A rigid body 2 is provided at the front end of the connecting portion 1. A single-edge cutter head portion 3 is provided at the front end of the rigid body 2. A drilling portion 4 is provided at the center position of the front end of the single-edge cutter head portion 3;

[0030] The drilling part 4, with a pointed end 41 at the front end of the drilling part 4, an arc-shaped chip removal groove 42 at the rear end of the pointed end 41, a spiral drilling groove 43 connected to the rear end of the arc-shaped chip removal groove 42. The spiral drilling groove 43 is in a stepped shape, and the diameter of the rear end of the drilling part 4 is larger than that of the front end.

[0031] Furthermore, the connecting part 1 includes an end handle 11. A limiting groove 12 is provided at the front end of the end handle 11, an installation body 13 is provided at the front end of the limiting groove 12, a convex arc 14 is provided at the front end of the installation body 13, and the diameter of the installation body 13 is smaller than the structure of the rigid body 2. The connecting part 1 is mainly for facilitating the disassembly and assembly with the rotating body. The limiting groove 12 is for limiting, and the convex arc 14 is mainly for the transitional connection with the rigid body 2 to ensure a large overall rigid strength, no bumping corners during the worker's handling process, and not easy to be scratched.

[0032] Furthermore, a receiving part 21 is fixedly connected to the front end of the rigid body 2. The receiving part 21 is in a trapezoidal platform structure, and the diameter of the front end of the receiving part 21 is larger than that of the rear end. The diameter of the front end of the receiving part 21 is the same as the diameter of the single-edge cutter head 3. The receiving part 21 is for ensuring the reasonable installation of the single-edge cutter head 3, with a large overall connection rigid strength, reasonable design, and strong practicability.

[0033] Furthermore, a spiral chip removal groove 31 is spirally provided on the single-edge cutter head 3, and a planar cutting edge peak 32 is provided on the outer side of the single-edge cutter head 3. The planar cutting edge peak 32 is convenient for opening holes, not easy to wear, and has a long service life. The spiral chip removal groove 31 is convenient for chip removal.

[0034] Even further, a base 44 is provided at the lower end of the drilling part 4. The base 44 is fixedly connected to the single-edge cutter head 3 at the rear end, and the thickness of one end of the base 44 is greater than that of the other end. The front end of the single-edge cutter head 3 is an inclined plane. The side wall of the base 44 connected to the inclined position at the front end of the single-edge cutter head 3 near the rigid body 2 is thick, and the side wall of the base 44 connected to the inclined position at the front end of the single-edge cutter head 3 far from the rigid body 2 is thin. The drilling part 4 is used to ensure the verticality of its axis, so the height difference is filled by the base 44, and the base 44 can also ensure a large connection rigid strength of the drilling part 4. The pointed end 41 enables the whole tool to have a fast hole-opening speed and accurate hole-opening position.

[0035] Working process: First, the connecting part 1 is limit-installed and connected with the rotating body. The limiting connection is carried out by using the limiting groove 12. The drilling part 4 is positioned, the pointed end 41 is positioned, the arc-shaped chip removal groove 42 is convenient for chip removal during drilling, the spiral drilling groove 43 is convenient for opening holes to improve the hole-opening efficiency, the single-edge cutter head 3 ensures the subsequent hole-opening depth and hole-opening efficiency. The whole tool has a large rigid strength, accurate hole-opening position, and high hole-opening efficiency.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "front and back", "left and right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the utility model.

[0037] Of course, in this technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. The term "one" should not be construed as a limitation on the quantity.

[0038] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art in the technical disclosure of the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A single-edge spiral drill bit, characterized in that: include A connecting portion (1), wherein a rigid body (2) is provided at the front end of the connecting portion (1), a single-edged blade head (3) is provided at the front end of the rigid body (2), and a drilling portion (4) is provided at the center of the front end of the single-edged blade head (3); A drilling portion (4), wherein a tip portion (41) is provided at the front end of the drilling portion (4), an arc-shaped chip removal groove (42) is provided at the rear end of the tip portion (41), the rear end of the arc-shaped chip removal groove (42) is connected to a spiral drilling groove (43), the spiral drilling groove (43) is stepped, and the rear end diameter of the drilling portion (4) is greater than the front end diameter.

2. A single-edge spiral drill bit according to claim 1, characterized in that: The connecting portion (1) comprises an end handle (11), a limiting groove (12) is provided at the front end of the end handle (11), a mounting body (13) is provided at the front end of the limiting groove (12), a raised arc (14) is provided at the front end of the mounting body (13), and the diameter of the mounting body (13) is smaller than the rigid body (2) structure.

3. A single-edge spiral drill bit according to claim 1, characterized in that: The front end of the rigid body (2) is fixedly connected to the receiving portion (21); the receiving portion (21) is a trapezoidal structure; the front end diameter of the receiving portion (21) is larger than the rear end diameter; the front end diameter of the receiving portion (21) is the same as the diameter of the single-edged blade head (3).

4. A single-edge spiral drill bit according to claim 1, characterized in that: The single-edged cutting head portion (3) is spirally provided with a spiral chip removal groove (31), and a plane cutting edge (32) is provided on the outer side of the single-edged cutting head portion (3).

5. The single-edge spiral drill bit according to claim 1, characterized in that: A base (44) is provided at the lower end of the drilling portion (4), the rear end of the base (44) is fixedly connected to the single-edged blade head (3), and one end of the base (44) is thicker than the other end. The front end of the single-edged blade head (3) is an inclined plane, and the side wall of the base (44) connected to the rigid body (2) at the front end inclined position of the single-edged blade head (3) is thick, while the side wall of the base (44) connected to the rigid body (2) at the front end inclined position of the single-edged blade head (3) is thin.

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