Combined stepped twist drill tool

Abstract

The utility model relates to the technical field of twist drill tools, and discloses a combined stepped twist drill tool which comprises a tool handle, a drill bit mechanism is arranged at the bottom end of the tool handle, an external mechanism is arranged outside the tool handle and comprises a drill bit assembly and a connecting assembly, and the drill bit assembly is arranged outside the tool handle. The connecting assembly is arranged in the drill bit assembly, the drill bit assembly comprises a stepped drill bit, the stepped drill bit is arranged outside the cutter handle, a second chip groove is formed in the outer wall of the stepped drill bit, an end cover is arranged at the top of the stepped drill bit, an exhaust hole is formed in the top of the end cover, and a second cutting edge is arranged at the bottom of the stepped drill bit. And counter bores can be conveniently machined through the stepped drill bit. According to the combined stepped twist drill tool, the stepped drill bit and the tool handle are in limiting sliding connection, the tool handle and the stepped drill bit are connected through the four connecting assemblies, and therefore the stability of connection between the tool handle and the stepped drill bit is guaranteed, and meanwhile the problem of looseness in the rotating process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of twist drill tool technology, specifically a combined stepped twist drill tool. Background Technology

[0002] When drilling, twist drills are usually used to make holes. However, to achieve countersinking in one operation, a stepped twist drill is needed, which uses two drill bits of different diameters to form the countersink in one pass.

[0003] According to the patent application published on the Internet (authorization announcement number: CN 206794844U), "This utility model discloses a combined stepped twist drill tool, including a twist drill bit, a countersinking tool coaxially sleeved on the shank of the twist drill bit, the countersinking tool having an axial countersinking hole, and a cutting insert detachably mounted on the countersinking tool. This utility model of a combined stepped twist drill tool adopts the principle of sleeve-shaft assembly technology. By fitting a large-diameter countersinking tool onto the upper round shank of an existing standard diameter twist drill bit, it achieves free diameter combination machining of stepped holes, and has the characteristics of freely combinable machining dimensions and low cost."

[0004] Regarding the above description, the applicant believes the following issues exist:

[0005] In use, this utility model connects a countersunk hole tool and a twist drill bit, and fixes them together with a retaining bolt and a spring plate to achieve countersunk hole machining. However, in actual use, relying solely on a retaining bolt for connection and a spring plate for clamping can easily lead to loosening during high-speed rotation. Therefore, a combined stepped twist drill bit is needed to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a combined stepped twist drill tool to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a combined stepped twist drill bit, including a shank, a drill bit mechanism at the bottom end of the shank, and an external mechanism on the outside of the shank.

[0008] The external mechanism includes a drill bit assembly and a connecting assembly. The drill bit assembly is located outside the tool holder, and the connecting assembly is located inside the drill bit assembly.

[0009] The drill bit assembly includes a stepped drill bit disposed outside the tool holder. The stepped drill bit has a second chip removal groove on its outer wall. The top of the stepped drill bit is provided with an end cap, and the top of the end cap is provided with a vent hole. The bottom of the stepped drill bit is provided with a second cutting edge, which facilitates the machining of countersunk holes by the stepped drill bit.

[0010] Preferably, the outer wall of the tool holder has a limiting groove, the inner wall of the stepped drill bit has a protrusion structure, and the stepped drill bit is disposed outside the tool holder through the protrusion structure and the limiting groove, so as to facilitate the connection between the stepped drill bit and the tool holder.

[0011] Preferably, the inner wall of the end cap is provided with a protruding structure, and the end cap is positioned on the top of the stepped drill bit by means of the protruding structure, so as to facilitate the installation of the end cap on the stepped drill bit.

[0012] Preferably, the connecting assembly includes a first plug-in block, which is plugged into the outer inner wall of the stepped drill bit. A threaded post is fixedly installed on the inner side of the first plug-in block, and a threaded sleeve is installed on the outer thread of the threaded post. A rotating nut is fixedly installed on the outer side of the threaded sleeve, and a second plug-in block is rotatably installed on the inner side of the threaded sleeve, so as to facilitate the connection and fixation of the stepped drill bit and the tool holder.

[0013] Preferably, a through hole is provided on the inner side of the stepped drill bit at the corresponding position of the second insertion block, and an insertion groove is provided on the corresponding position of the tool holder and the second insertion block. The second insertion block passes through the through hole and is inserted into the inside of the insertion groove, which facilitates insertion and fixation through the second insertion block.

[0014] Preferably, four connecting components are provided, and the four connecting components are arranged in a circular array around the center of the stepped drill bit to improve the connection strength between the stepped drill bit and the tool holder.

[0015] Preferably, the drill bit mechanism includes a twist drill rod, which is fixedly installed at the bottom of the tool holder. The outside of the twist drill rod is provided with a first chip removal groove, and the bottom of the twist drill rod is provided with a first cutting edge, so as to facilitate the twist drill rod to perform drilling operations.

[0016] Compared with the prior art, this utility model provides a combined stepped twist drill tool, which has the following beneficial effects:

[0017] 1. This combined stepped twist drill bit, through its external mechanism, ensures the stability of the connection between the drill bit and the shank by limiting the sliding connection between the stepped drill bit and the shank through four sets of connecting components, thereby preventing loosening during rotation.

[0018] 2. This combined stepped twist drill bit, through its drill bit mechanism and drill bit assembly, allows the twist drill bit and stepped drill bit to drill holes during the machining process, thus enabling the formation of countersunk holes in one step. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0021] Figure 2 This is a front sectional view of the present invention.

[0022] Figure 3 This is a schematic diagram of the external structure of the connecting component of this utility model;

[0023] Figure 4 This is an exploded view of the end cap structure of this utility model;

[0024] Figure 5 This is an exploded view of the tool holder of this utility model.

[0025] In the diagram: 1. Tool holder; 2. Drill bit mechanism; 21. Twist drill rod; 22. First chip removal groove; 23. First cutting edge; 3. External mechanism; 31. Drill bit assembly; 311. Stepped drill bit; 312. Second chip removal groove; 313. End cap; 314. Vent hole; 315. Second cutting edge; 32. Connecting assembly; 321. First insertion block; 322. Threaded post; 323. Threaded sleeve; 324. Rotating nut; 325. Second insertion block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Example 1:

[0029] Please see Figure 1-5 This utility model provides a technical solution: a combined stepped twist drill bit, including a shank 1, a drill bit mechanism 2 at the bottom of the shank 1, and an external mechanism 3 on the outside of the shank 1.

[0030] The external mechanism 3 includes a drill assembly 31 and a connecting assembly 32. The drill assembly 31 is located outside the tool holder 1, and the connecting assembly 32 is located inside the drill assembly 31.

[0031] The drill assembly 31 includes a stepped drill bit 311, which is disposed outside the tool holder 1. The outer wall of the stepped drill bit 311 is provided with a second chip removal groove 312. The top of the stepped drill bit 311 is provided with an end cap 313, and the top of the end cap 313 is provided with a vent hole 314. The bottom of the stepped drill bit 311 is provided with a second cutting edge 315, which facilitates the machining of countersunk holes through the stepped drill bit 311.

[0032] Furthermore, a limiting groove is provided on the outer wall of the tool holder 1, and a protrusion structure is provided on the inner wall of the stepped drill bit 311. The stepped drill bit 311 is located on the outside of the tool holder 1 through the protrusion structure and the limiting groove, which facilitates the connection between the stepped drill bit 311 and the tool holder 1.

[0033] Furthermore, the inner wall of the end cap 313 is provided with a protruding structure, and the end cap 313 is positioned on the top of the stepped drill bit 311 by means of the protruding structure, so that the end cap 313 can be installed on the stepped drill bit 311.

[0034] Furthermore, the connecting assembly 32 includes a first insertion block 321, which is inserted into the outer inner wall of the stepped drill bit 311. A threaded post 322 is fixedly installed on the inner side of the first insertion block 321, and a threaded sleeve 323 is installed on the outer thread of the threaded post 322. A rotating nut 324 is fixedly installed on the outer side of the threaded sleeve 323, and a second insertion block 325 is rotatably installed on the inner side of the threaded sleeve 323, so as to facilitate the connection and fixation of the stepped drill bit 311 and the tool holder 1.

[0035] Furthermore, a through hole is provided on the inner side of the stepped drill bit 311 at the corresponding position of the second insertion block 325, and an insertion groove is provided on the corresponding position of the tool holder 1 and the second insertion block 325. The second insertion block 325 passes through the through hole and is inserted into the inside of the insertion groove, which facilitates insertion and fixing through the second insertion block 325.

[0036] Furthermore, four connecting components 32 are provided, and the four connecting components 32 are arranged in a circular array around the center of the stepped drill bit 311 to improve the connection strength between the stepped drill bit 311 and the tool holder 1.

[0037] Example 2:

[0038] Please see Figure 2 Furthermore, in conjunction with Embodiment 1, the drill bit mechanism 2 includes a twist drill rod 21, which is fixedly installed at the bottom of the tool holder 1. A first chip removal groove 22 is provided on the outside of the twist drill rod 21, and a first cutting edge 23 is provided at the bottom of the twist drill rod 21, so as to facilitate the twist drill rod 21 to perform drilling.

[0039] In actual operation, when this device is used, the stepped drill bit 311 is fitted onto the outside of the tool holder 1, and the insertion slot on the tool holder 1 is aligned with the through hole of the stepped drill bit 311. Then, the first insertion block 321 is inserted into the groove on the inner wall of the outer side of the stepped drill bit 311. Then, the rotating nut 324 is rotated, which causes the threaded sleeve 323 to rotate, so that the threaded sleeve 323 drives the second insertion block 325 through the through hole of the stepped drill bit 311 and inserts it into the insertion slot of the tool holder 1. The nut 324 is then tightened and fixed. The above operation is repeated to install the four connecting components 32 in sequence. Then, the end cap 313 is fitted onto the outside of the tool holder 1 and inserted into the top of the stepped drill bit 311.

[0040] By connecting the tool holder 1 to the tool, the tool drives the tool holder 1 to rotate, thereby driving the twist drill rod 21 and the step drill bit 311 to rotate. First, the twist drill rod 21 is used to drill the inner hole, and then the step drill bit is used to drill the outer hole.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A combined stepped twist drill bit, comprising a tool holder (1), characterized in that: The bottom end of the handle (1) is provided with a drill bit mechanism (2), and the outside of the handle (1) is provided with an external mechanism (3); The external mechanism (3) includes a drill bit assembly (31) and a connecting assembly (32). The drill bit assembly (31) is disposed outside the tool holder (1), and the connecting assembly (32) is disposed inside the drill bit assembly (31). The drill assembly (31) includes a stepped drill bit (311), which is disposed outside the tool holder (1). The outer wall of the stepped drill bit (311) is provided with a second chip removal groove (312). The top of the stepped drill bit (311) is provided with an end cap (313), and the top of the end cap (313) is provided with a vent hole (314). The bottom of the stepped drill bit (311) is provided with a second cutting edge (315).

2. The combined stepped twist drill bit according to claim 1, characterized in that: The outer wall of the tool holder (1) is provided with a limiting groove, the inner wall of the stepped drill bit (311) is provided with a protrusion structure, and the stepped drill bit (311) is provided on the outside of the tool holder (1) through the protrusion structure and the limiting groove.

3. A combined stepped twist drill tool according to claim 2, characterized in that: The inner wall of the end cap (313) is provided with a protruding structure, and the end cap (313) is positioned on the top of the stepped drill bit (311) by means of the protruding structure.

4. A combined stepped twist drill bit according to claim 1, characterized in that: The connecting assembly (32) includes a first plug-in block (321), which is inserted into the outer inner wall of the stepped drill bit (311). A threaded post (322) is fixedly installed on the inner side of the first plug-in block (321). A threaded sleeve (323) is installed on the outer thread of the threaded post (322). A rotating nut (324) is fixedly installed on the outer side of the threaded sleeve (323). A second plug-in block (325) is rotatably installed on the inner side of the threaded sleeve (323).

5. A combined stepped twist drill bit according to claim 4, characterized in that: The inner side of the stepped drill bit (311) is provided with a through hole at the corresponding position of the second plug-in block (325), and the tool holder (1) is provided with a plug-in groove at the corresponding position of the second plug-in block (325), and the second plug-in block (325) passes through the through hole and is inserted into the inside of the plug-in groove.

6. A combined stepped twist drill tool according to claim 4, characterized in that: The connecting components (32) are provided in four parts, and the four connecting components (32) are arranged in a circular array at the center of the stepped drill bit (311).

7. A combined stepped twist drill bit according to claim 1, characterized in that: The drill bit mechanism (2) includes a twist drill rod (21), which is fixedly installed at the bottom of the tool holder (1). The outside of the twist drill rod (21) is provided with a first chip removal groove (22), and the bottom of the twist drill rod (21) is provided with a first cutting edge (23).

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