Multi-layer step drill tip twist drill

Abstract

The utility model discloses a multi-layer step drill point twist drill which comprises a drill body, the drill body is of an integrated structure, the bottom end of the drill body is a large-diameter drill, the bottom end of the large-diameter drill is a reducing cone, the bottom of the reducing cone is a small-diameter drill, the bottom end of the small-diameter drill is fixedly connected with a cone base, and the center of the bottom end of the cone base is fixedly connected with a positioning cone. Relates to the technical field of twist drills, by arranging a positioning cone, the center position of a drill hole can be conveniently and accurately positioned during drilling, transition between small-diameter drills is achieved by arranging a cone base, and transition between the small-diameter drills and large-diameter drills is achieved by arranging a reducing cone. And therefore, the use practicability and the working smoothness of the equipment are improved, and meanwhile, the rotation resistance of the twist drill can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of twist drills, in particular to a twist drill with a multi-layer stepped drill tip. Background Art

[0002] When the twist drill is working, it realizes drilling through rotational motion and axial feed motion. When the twist drill rotates, the main cutting edge and the secondary cutting edge cut the workpiece, removing the workpiece material to form chips. At the same time, the spiral groove discharges the chips out of the hole in the spiral direction to prevent the chips from being blocked in the hole and affecting the drilling progress. The axial feed motion controls the depth of the drilling. By continuously feeding, the drill bit gradually penetrates into the workpiece until the required drilling depth is reached. The overall diameter of the existing twist drill is generally the same size. When drilling rough holes, it is usually inconvenient to locate the center point of the drill hole, which makes it easy for the drilling position to deviate. It is also inconvenient to perform layer-by-layer diameter reduction during drilling. The resistance during the initial drilling is relatively large, which increases the possibility of deflection and is inconvenient to use. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-layer step drill point twist drill to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A multi-layer stepped drill tip twist drill comprises a drill body, which is an integrated structure. The bottom end of the drill body is a coarse-diameter drill, the bottom end of the coarse-diameter drill is a reducing cone, the bottom of the reducing cone is a fine-diameter drill, the bottom end of the fine-diameter drill is fixedly connected to a cone seat, and the center position of the bottom end of the cone seat is fixedly connected to a positioning cone.

[0006] In a preferred embodiment of the present invention, the top of the drill body is fixedly connected to a hexagonal connecting rod, and the hexagonal connecting rod is used to cooperate with the electric drill chuck for connection.

[0007] In a preferred embodiment of the present invention, the drill body is configured to be cylindrical, the outer wall of the large-diameter drill is spirally distributed with a first drainage groove, and the outer wall of the reducing cone is spirally distributed with a second drainage groove.

[0008] In a preferred embodiment of the present invention, the top diameter of the reducing cone is equal to the diameter of the coarse-diameter drill, and the bottom diameter of the reducing cone is equal to the diameter of the fine-diameter drill.

[0009] In a preferred embodiment of the present invention, a third drainage groove is spirally distributed on the outer wall of the thin-diameter drill, and the second drainage groove is connected to the first drainage groove and the third drainage groove.

[0010] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention.

[0011] 1. By setting up a fine-diameter drill and a coarse-diameter drill for use together, it is convenient to control the feed depth of the twist drill to quickly adjust the diameter of the drilled hole, making it convenient to perform multi-step graded drilling and reducing the stability of the structure when drilling coarse-diameter holes;

[0012] 2. By setting the positioning cone, it is convenient to accurately locate the center of the drill hole during drilling. By setting the cone seat to transition between fine diameter drills, and by setting the reducing cone to transition between fine diameter drills and coarse diameter drills, the practicality of the equipment and the smoothness of the work are improved, and the resistance of the twist drill during rotation can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 This is a schematic diagram of the main structure of a multi-layer step drill point twist drill;

[0015] Figure 2 This is a schematic diagram of the upward-looking structure of a multi-layer step drill point twist drill;

[0016] Figure 3 A schematic diagram of a positioning terminal structure in a multi-layer step drill tip twist drill;

[0017] Figure 4 This is a schematic diagram of the reducer cone structure in a multi-layer step drill tip twist drill.

[0018] In the figure: drill body 1, hexagonal connecting rod 2, coarse diameter drill 3, first discharge groove 31, reducing cone 4, second discharge groove 41, fine diameter drill 5, third discharge groove 51, cone seat 6, positioning cone 7. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] Example 1: Figure 1-Figure 4, including a drill body 1, the drill body 1 is an integrated structure, the bottom end of the drill body 1 is a coarse diameter drill 3, the bottom end of the coarse diameter drill 3 is a reducing cone 4, the bottom of the reducing cone 4 is a fine diameter drill 5, the bottom end of the fine diameter drill 5 is fixedly connected to the cone seat 6, and the center position of the bottom end of the cone seat 6 is fixedly connected to the positioning cone 7.

[0021] The specific usage scenario of this embodiment is: by setting the positioning cone 7, it is convenient to accurately locate the center point of the drill hole during the initial drilling stage, to a certain extent, it avoids the effect of drilling deviation, improves the accuracy of drilling, and reduces the difficulty of drilling for the operator; by setting the cone seat 6, it is used to further expand the initial hole after drilling the positioning cone 7, and at the same time, it can keep the center position of the drill hole from being deflected; by setting the fine diameter drill 5 and the coarse diameter drill 3 for use in combination, it is convenient to control the diameter of the drill hole by advancing the feed depth of the twist drill according to the needs of use; by setting the variable diameter cone 4 to make a smooth transition between the fine diameter drill 5 and the coarse diameter drill 3, the smoothness of drilling is improved.

[0022] Example 2: Figure 1 and Figure 2 , including a drill body 1, the drill body 1 is an integrated structure, the bottom of the drill body 1 is a coarse-diameter drill 3, the bottom of the coarse-diameter drill 3 is a reducing cone 4, the bottom of the reducing cone 4 is a fine-diameter drill 5, the bottom of the fine-diameter drill 5 is fixedly connected to the cone seat 6, the center position of the bottom end of the cone seat 6 is fixedly connected to the positioning cone 7, the top of the drill body 1 is fixedly connected to the hexagonal connecting rod 2, the hexagonal connecting rod 2 is used to cooperate with the electric drill chuck connection,

[0023] The specific usage scenario of this embodiment is: by providing a hexagonal connecting rod 2 to facilitate adaptation to a commonly used chuck, it is convenient to clamp the drill body 1 and the electric drill.

[0024] Example 3: Figure 4 , including a drill body 1, the drill body 1 is an integrated structure, the bottom end of the drill body 1 is a coarse diameter drill 3, the bottom end of the coarse diameter drill 3 is a reducing cone 4, the bottom of the reducing cone 4 is a fine diameter drill 5, the bottom end of the fine diameter drill 5 is fixedly connected to the cone seat 6, the bottom center position of the cone seat 6 is fixedly connected to the positioning cone 7, the drill body 1 is set to be cylindrical, the outer wall of the coarse diameter drill 3 is spirally distributed with a first drainage groove 31, the outer wall of the reducing cone 4 is spirally distributed with a second drainage groove 41, the top diameter of the reducing cone 4 is equal to the diameter of the coarse diameter drill 3, the bottom end diameter of the reducing cone 4 is equal to the diameter of the fine diameter drill 5, the outer wall of the fine diameter drill 5 is spirally distributed with a third drainage groove 51, and the second drainage groove 41 is connected to the first drainage groove 31 and the third drainage groove 51.

[0025] The specific usage scenario of this embodiment is as follows: by setting the drill body 1 to be cylindrical, the resistance during rotation is reduced, thereby improving the drilling efficiency; by setting the coarse-diameter drill 3, the reducing cone 4 and the fine-diameter drill 5 for use in combination, it is convenient to perform the hole enlarging operation step by step, reduce the resistance during hole enlarging, and improve the working efficiency of the twist drill; by setting the first discharge groove 31, the second discharge groove 41 and the third discharge groove 51 for use in combination, it is used to quickly and conveniently discharge the debris generated by drilling; by connecting the first discharge groove 31, the second discharge groove 41 and the third discharge groove 51, it is convenient to improve the stability of chip discharge; by setting the top and bottom ends of the reducing cone 4 to be the same as the diameters of the coarse-diameter drill 3 and the fine-diameter drill 5 respectively, it is convenient to make the transition between the coarse-diameter drill 3 and the fine-diameter drill 5 smoother, thereby improving the structural stability of the twist drill during operation, avoiding the occurrence of drilling eccentricity to a certain extent, improving the drilling accuracy, and facilitating the positioning of the center point of the drill hole.

[0026] The working principle of the present invention is as follows: when in use, a technician in this field fixes the twist drill and the chuck of the electric drill through the hexagonal connecting rod 2, accurately locates the position where the hole needs to be drilled through the positioning cone 7, and then turns on the electric drill to drive the chuck and the drill body 1 to rotate synchronously, so that the positioning cone 7 can drill the position to be drilled, and then the cone seat 6 is expanded, so that the fine-diameter drill 5 at the top of the cone seat 6 is drilled, and then after the fine-diameter drill 5 is completely passed through the hole, the hole is expanded in one step through the reducing cone 4, so that the reducing cone 4 slowly expands the hole diameter, and then the coarse-diameter drill 3 is used to further expand the hole, thereby realizing gradual expansion of the hole in multiple steps.

[0027] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-layer step drill tip twist drill, comprising a drill body (1), wherein the drill body (1) is an integrated structure, and the bottom end of the drill body (1) is a coarse-diameter drill (3), characterized in that: The bottom end of the coarse-diameter drill (3) is a reducing cone (4), the bottom of the reducing cone (4) is a fine-diameter drill (5), the bottom end of the fine-diameter drill (5) is fixedly connected to a cone seat (6), and the center position of the bottom end of the cone seat (6) is fixedly connected to a positioning cone (7).

2. The multi-layer step drill point twist drill according to claim 1, characterized in that: The top of the drill body (1) is fixedly connected to a hexagonal connecting rod (2), and the hexagonal connecting rod (2) is used to cooperate with the electric drill chuck for connection.

3. The multi-layer step drill point twist drill according to claim 1, characterized in that: The drill body (1) is configured as a cylinder, the outer wall of the large-diameter drill (3) is provided with a first drainage groove (31) distributed in a spiral pattern, and the outer wall of the reducing cone (4) is provided with a second drainage groove (41) distributed in a spiral pattern.

4. The multi-layer step drill point twist drill according to claim 3, characterized in that: The top diameter of the reducing cone (4) is equal to the diameter of the coarse-diameter drill (3), and the bottom diameter of the reducing cone (4) is equal to the diameter of the fine-diameter drill (5).

5. The multi-layer step drill point twist drill according to claim 4, characterized in that: A third drainage groove (51) is spirally distributed on the outer wall of the thin-diameter drill (5), and the second drainage groove (41) is connected to the first drainage groove (31) and the third drainage groove (51).

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