Modular drilling tool

Abstract

The utility model discloses a modular drilling tool which comprises a tool bar and a drill bit, and positioning columns are distributed on the first end face of the tool bar around the central axis of the tool bar. A positioning hole is correspondingly formed in the second end face of the drill bit and matched with the positioning column. The positioning hole penetrates through the front end and the rear end of the drill bit, the positioning hole is formed by linearly connecting a first hole site, a second hole site and a third hole site, and the positioning column is limited in the first hole site. The cutter bar and the drill bit are of a split structure, the structure is simple, the feeding rate and the length-diameter ratio are high, the drill bit can be replaced according to the diameter, the cutter bar does not need to be replaced, and resources are saved; a positioning column is arranged on the cutter bar, a positioning hole is formed in the drill bit, the positioning column is inserted into the positioning hole, the positioning column and the positioning hole are locked through a connecting screw, precise matching is achieved, the concentricity and the coaxiality of the cutter bar and the drill bit are higher, and the transverse cutting force is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, and more specifically to a modular drill bit. Background Art

[0002] In the field of milling machining, drill bits are often used for milling, and can be used to machine hole positions, perform polishing treatment, etc.; traditional drill bits are all of an integral structure, that is, the drill bit is directly assembled at the front end of the tool shank, and the drill bit is driven to rotate synchronously by the rotation of the tool shank for milling. When replacing drill bits of different models, the tool shank needs to be replaced synchronously, which is inconvenient for assembly and wastes resources at the same time.

[0003] Therefore, the applicant proposes a modular drill bit. When replacing drill bits of different models, the tool shank does not need to be replaced, and only the drill bit needs to be replaced. Summary of the Utility Model

[0004] In view of this, the utility model provides a modular drill bit.

[0005] To achieve the above object, the utility model adopts the following technical scheme: A modular drill bit includes: a tool shank and a drill bit. Positioning posts are distributed around the central axis of the first end face of the tool shank; corresponding positioning holes are provided on the second end face of the drill bit, and the positioning holes are matched with the positioning posts.

[0006] The positioning holes penetrate through the front end and the rear end of the drill bit. The positioning holes are formed by linearly connecting a first hole position, a second hole position, and a third hole position. The positioning posts are restricted in the first hole position.

[0007] As a preferred scheme of the utility model, the diameter of the second hole position is smaller than the diameters of the first hole position and the third hole position. The second hole position is located between the first hole position and the third hole position, so that limiting surfaces are formed between the second hole position and the first hole position, and between the second hole position and the third hole position.

[0008] As a preferred scheme of the utility model, the tool shank and the drill bit are locked tightly by a connecting screw.

[0009] As a preferred scheme of the utility model, a threaded hole is formed in the positioning post and extends towards the inside of the tool shank; the connecting screw passes through the positioning hole and is threadedly connected with the positioning post, so that the drill bit is locked tightly to the tool shank.

[0010] As a preferred scheme of the utility model, the nut of the connecting screw is restricted in the third hole position.

[0011] As a preferred scheme of the utility model, two positioning posts are provided, and two corresponding positioning holes are provided; the positioning posts protrude outwards parallel to the central axis of the tool shank, and the two positioning posts are symmetrically distributed around the central axis.

[0012] As can be seen from the above technical solutions, compared with the prior art, the present utility model has the following beneficial technical effects: In the present utility model, the tool shank and the drill bit have a split structure, which is simple in structure, has a high feed rate and a long aspect ratio. The drill bit can be replaced according to the diameter without replacing the tool shank, saving resources. A positioning post is provided on the tool shank, and a positioning hole is provided on the drill bit. The positioning post is inserted into the positioning hole, and the two are locked by a connecting screw to achieve precise cooperation, making the concentricity and coaxiality of the tool shank and the drill bit higher, and the transverse cutting force stronger.

[0013] The remaining beneficial technical effects of the present utility model are embodied in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0015] Figure 1 It is a schematic diagram of the modular drill of the present utility model;

[0016] Figure 2 It is an exploded view of the modular drill of the present utility model;

[0017] Figure 3 It is a schematic diagram of the drill bit in the modular drill of the present utility model;

[0018] Figure 4 It is a cross-sectional schematic diagram of the modular drill of the present utility model;

[0019] Figure 5 For Figure 4 The enlarged view of part A in

[0020] DESCRIPTION OF THE REFERENCE NUMERALS

[0021] Tool shank 100; positioning post 110; drill bit 200; positioning hole 210; first hole position 211; second hole position 212; third hole position 213; connecting screw 300. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] A modular drill bit, please refer to Figures 1-5 as shown, including: a tool shank 100 and a drill bit 200;

[0026] The tool shank 100 is made of H13 material and heat-treated to HRC50 - 52° to ensure hardness and toughness. The tool shank 100 is in the shape of a rod, and the tool shank 100 mainly functions to connect the machine tool and the drill bit 200.

[0027] In this embodiment, the tool shank 100 can be customized according to the drilling depth of the workpiece to be processed.

[0028] Positioning posts 110 are distributed around the central axis of the first end face of the tool shank 100. The positioning posts 110 are arranged parallel to the central axis of the tool shank 100 and axially protrude from the first end face;

[0029] Correspondingly, positioning holes 210 are provided on the second end face of the drill bit 200. The positioning holes 210 cooperate with the positioning posts 110; the positioning holes 210 penetrate through the front end and the rear end of the drill bit 200. The positioning holes 210 are formed by linearly connecting a first hole position 211, a second hole position 212, and a third hole position 213, and the positioning posts 110 are restricted in the first hole position 211.

[0030] Another example is Figure 1 as shown, the front end of the drill bit 200 forms a drill tip, and the entire drill bit 200 is made of cemented carbide material, which can achieve a high feed rate.

[0031] Further, the diameter of the second hole 212 is smaller than the diameters of the first hole 211 and the third hole 213. The second hole 212 is located between the first hole 211 and the third hole 213, so that a limiting surface is formed between the second hole 212 and the first hole 211, and between the second hole 212 and the third hole 213.

[0032] As Figure 5 shown, the cross-section of the positioning hole 210 is in a horizontal "I" shape.

[0033] Further, the cutter bar 100 and the drill bit 200 are locked by a connecting screw 300. During assembly, a threaded hole is formed in the positioning post 110, and the threaded hole extends into the interior of the cutter bar 100; the connecting screw 300 passes through the positioning hole 210 and is threadedly connected to the positioning post 110, so that the drill bit 200 is locked to the cutter bar 100; the nut of the connecting screw 300 is restricted within the third hole 213.

[0034] Precise fit is achieved through the positioning post 110 and the positioning hole 210, so that the concentricity and coaxiality of the cutter bar 100 and the drill bit 200 are higher, and the lateral cutting force is stronger.

[0035] Further, two positioning posts 110 are provided, and two corresponding positioning holes 210 are provided; the positioning posts 110 protrude outward parallel to the central axis of the cutter bar 100, and the two positioning posts 110 are symmetrically distributed around the central axis;

[0036] During assembly, as Figure 4 shown, the drill bit 200 is pre-assembled with the cutter bar 100 first. The positioning post 110 is inserted into the positioning hole 210 for preliminary positioning, and then the connecting screw 300 is passed through the positioning hole 210 from left to right and threadedly screwed into the positioning post 110, so that the cutter bar 100 and the drill bit 200 are fixed by screwing;

[0037] When the drill bit 200 needs to be replaced, the connecting screw 300 is threadedly unscrewed to the left, and the drill bit 200 can be replaced without replacing the cutter bar 100.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular drill, characterized in that: include: A tool rod (100) and a drill bit (200), wherein a first end surface of the tool rod (100) is provided with positioning posts (110) around the central axis of the tool rod (100); a second end surface of the drill bit (200) is provided with a positioning hole (210) correspondingly, and the positioning hole (210) matches the positioning post (110); The positioning hole (210) passes through the front end and the rear end of the drill bit (200), and the positioning hole (210) is composed of a first hole position (211), a second hole position (212), and a third hole position (213) connected in a straight line, and the positioning column (110) is confined in the first hole position (211).

2. A modular drill according to claim 1, characterized in that: The diameter of the second hole position (212) is smaller than the diameters of the first hole position (211) and the third hole position (213); the second hole position (212) is located between the first hole position (211) and the third hole position (213), so that a limiting surface is formed between the second hole position (212) and the first hole position (211), and between the second hole position (212) and the third hole position (213).

3. A modular drill according to claim 2, characterized in that: The tool rod (100) and the drill bit (200) are locked together by a connecting screw (300).

4. A modular drill according to claim 3, characterized in that: A screw hole is formed in the positioning column (110), and the screw hole extends into the interior of the tool rod (100); the link screw (300) passes through the positioning hole (210) and is threadedly connected to the positioning column (110), so that the drill bit (200) is locked to the tool rod (100).

5. A modular drill according to claim 4, characterized in that: The nut of the linking screw (300) is confined within the third hole position (213).

6. A modular drill according to claim 1, characterized in that: Two positioning posts (110) are provided, and two positioning holes (210) are provided accordingly; the positioning posts (110) are provided to protrude outwardly parallel to the central axis of the knife rod (100), and the two positioning posts (110) are symmetrically distributed around the central axis.

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