Internal cooling modular drill bit

Abstract

According to the internal cooling modular drill bit, a tool bit is fixedly connected with a tool body through a threaded connecting piece, the threaded connecting piece is a hollow cylinder, a first cooling channel is formed in the middle of the cylinder, a second cooling channel is formed in the middle of the tool body, and the first cooling channel and the second cooling channel are used for receiving and conveying cooling liquid; the tool bit is provided with a positioning opening end which is an inwards-concave conical surface, the inwards-concave conical surface is connected with the outwards-concave arc conical surface in an attached mode, the connecting position of the first cooling channel and the second cooling channel is well sealed, and a cooling liquid cavity is formed in the tool bit and used for providing a cooling liquid buffering space. Through the first cooling channel and the second cooling channel, the cooling liquid cavity is large in cooling flow, high in flow speed and high in cooling efficiency, liquid outlets are formed in the two sides, close to the cooling liquid cavity, of the outer portion of the tool bit and used for outputting cooling liquid, and the first cooling channel is connected with the liquid outlets of the cooling liquid cavity through the second cooling channel. The liquid outlet and the cutting edge of the tool bit correspond and are located on the same straight line, and the cooling efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of precision machining, and more specifically, to an internally cooled modular drill bit. Background Art

[0002] Commonly used drill bits have a cutter head and a blade that are generally integrated. When the drill bit is in use, the cutter head plays a drilling role and is prone to wear or breakage. To ensure cutting efficiency and product quality, the cutter head needs to be replaced frequently. The replacement cost of an integrated drill bit is high. In order to solve this problem, a modular drill bit with a replaceable cutter head is proposed.

[0003] The drill bit that is closest to the present application in the prior art is the application publication number: CN104907613A, a drill bit with a replaceable cutter head, the present invention includes a tool rod, a tool head, a No. 1 screw and a No. 2 screw, the tool rod includes a tool rod body, and its characteristics are: a No. 1 boss and a No. 2 boss are provided at one end of the tool rod body, a No. 1 supporting plane and a No. 1 fixing screw hole are provided on the No. 1 boss, the axis of the No. 1 fixing screw hole is perpendicular to the No. 1 supporting plane, and a positioning hole is provided at the bottom of the blade slot; a No. 1 supporting surface and a No. 2 supporting surface are provided on both sides of the tool head body, and the No. 1 supporting surface and the No. 2 supporting surface are both planar structures, the positioning column is located in the positioning hole, the tool head body is located in the blade slot, the No. 1 supporting surface is close to the No. 1 supporting plane, and the No. 2 supporting surface is close to the No. 2 supporting plane.

[0004] The drill bit uses No. 1 screw and No. 2 screw to lock the cutter head and the cutter rod from the side, which affects the capacity and speed of the cooling water channel, resulting in low cooling efficiency during processing and insufficient cooling.

[0005] In view of this, the present invention proposes an internally cooled modular drill bit which can be fully cooled and has a simple structure. Summary of the invention

[0006] The purpose of the present invention is to provide an internally cooled modular drill bit which can be fully cooled and has a simple structure.

[0007] A modular drill bit with internal cooling comprises a cutter head 1, a cutter body 2 and a threaded connector 3, wherein the cutter head 1 is fixedly connected to the cutter body 2 via the threaded connector 3, one end of the threaded connector 3 is a first threaded connector 31, and the other end of the threaded connector 3 is a second threaded connector 32, the cutter head 1 is connected to the threaded connector 3 via the first threaded connector 31, and the cutter body 2 is connected to the threaded connector 3 via the second threaded connector 32, the threaded connector 3 is a hollow cylinder, a first cooling channel 33 is provided in the middle of the cylinder, a second cooling channel 21 is provided in the middle of the cutter body 2, the first cooling channel 33 and the second cooling channel 21 are used for receiving and transporting coolant, a coolant chamber 11 is provided in the cutter head 1, the coolant chamber 11 is used for providing a coolant buffer space, liquid outlets 12 are provided on both sides of the outside of the cutter head 1 close to the coolant chamber 11, the liquid outlets 12 are used for outputting coolant, and the first cooling channel 33 is connected to the liquid outlet 12 of the coolant chamber 11 via the second cooling channel 21.

[0008] Furthermore, the first threaded connection portion 31 is a positive thread, and the second threaded connection portion 32 is a negative thread. The different thread directions facilitate installation.

[0009] In some embodiments, the diameter of the input end of the first cooling channel 33 is larger than the diameter of the output end of the first cooling channel 33 to facilitate the output of the cooling liquid.

[0010] In some embodiments, the end of the cutter body 2 close to the cutter head 1 is an outer concave arc cone surface 13. When the cutter head 1 and the cutter body 2 are rotated and pressed together by the processing pressure, vibration is reduced and centering is facilitated.

[0011] Furthermore, the curvature of the outer concave arc cone surface 13 is 138°.

[0012] In some embodiments, the cutter body 2 is provided with two guide positioning columns 4 at intervals near the end of the threaded connector 3. The guide positioning columns 4 are truncated cone-shaped to facilitate the guiding connection between the cutter head 1 and the cutter body 2. The cutter head 1 is provided with two positioning ports 5 at intervals near the end of the threaded connector 3, and each guide positioning column 4 is correspondingly connected to each positioning port 5.

[0013] Furthermore, the diameter of the guide and positioning column 4 away from the blade body 2 is smaller than the diameter of the guide and positioning column 4 close to the blade body 2 .

[0014] In some embodiments, the cutter head 1 is provided with two positioning openings 5 ​​with inner concave conical surfaces 6 at the ends thereof, and the inner concave conical surfaces 6 are closely connected with the outer concave arc conical surfaces 13 to better seal the connection between the first cooling channel 33 and the second cooling channel 21 .

[0015] In some embodiments, the liquid outlet 12 corresponds to the cutting edge of the cutter head 1 and is located on the same straight line.

[0016] In some embodiments, the liquid outlet 12 forms an angle with the cooling liquid chamber 11, and the angle formed by the liquid outlet 12 and the cooling liquid chamber 11 is 15°-45°.

[0017] Beneficial effects of the invention: The invention proposes an internally cooled modular drill bit, wherein the cutter head 1 is fixedly connected to the cutter body 2 by a threaded connector 3, which is convenient for installation. The threaded connector 3 is a hollow cylinder, and a first cooling channel 33 is provided in the middle of the cylinder, and a second cooling channel 21 is provided in the middle of the cutter body 2. The first cooling channel 33 and the second cooling channel 21 are used to receive and transport the coolant. The cutter head 1 is provided with two locating ports 5, and the ends thereof are concave conical surfaces 6, which are fitted and connected with the outer concave arc conical surface 13, so as to better seal the connection between the first cooling channel 33 and the second cooling channel 21. A coolant chamber 11 is provided in the cutter head 1, and the coolant chamber 11 is used to provide a coolant buffer space. The cooling flow rate is large and the flow rate is high through the first cooling channel 33, the second cooling channel 21, and the coolant chamber 11, and the cooling efficiency is high. Liquid outlets 12 are provided on both sides of the outside of the cutter head 1 close to the coolant chamber 11, and the liquid outlets 12 are used to output the coolant. The first cooling channel 33 is connected to the liquid outlet 12 of the coolant chamber 11 through the second cooling channel 21. The liquid outlet 12 corresponds to the cutting edge of the cutter head 1 and is on the same straight line, which further improves the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the exploded structure of an internally cooled modular drill bit of the present application.

[0019] Figure 2 This is a schematic diagram of the cutter head structure of an internally cooled modular drill bit of the present application.

[0020] Figure 3 This is a schematic diagram of the cutter body structure of an internally cooled modular drill bit of the present application.

[0021] Figure 4 This is a schematic diagram of the structure of a threaded connector of an internally cooled modular drill bit of the present application.

[0022] Main component symbols

[0023] The cutter head 1, the coolant chamber 11, the liquid outlet 12, the outer concave arc cone surface 13, the cutter body 2, the second cooling channel 21, the threaded connection 3, the first threaded connection part 31, the second threaded connection part 32, the first cooling channel 33, the guide positioning column 4, the positioning port 5, and the inner concave cone surface 6.

[0024] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] The following examples are described to assist the understanding of the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0026] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including within a single system or component).

[0027] At the same time, the connections between components or systems are not intended to be limited to direct connections, rather, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections. Example

[0028] like Figure 1 As shown, it is a schematic diagram of the exploded structure of an internally cooled modular drill bit of the present application; Figure 2 As shown, it is a schematic diagram of the cutter head structure of an internally cooled modular drill bit of the present application; Figure 3 As shown, it is a schematic diagram of the cutter body structure of an internally cooled modular drill bit of the present application; Figure 4 Shown is a schematic diagram of the threaded connector structure of an internally cooled modular drill bit of the present application.

[0029] A modular drill bit with internal cooling comprises a cutter head 1, a cutter body 2 and a threaded connector 3, wherein the cutter head 1 is fixedly connected to the cutter body 2 via the threaded connector 3, one end of the threaded connector 3 is a first threaded connector 31, and the other end of the threaded connector 3 is a second threaded connector 32, the cutter head 1 is connected to the threaded connector 3 via the first threaded connector 31, and the cutter body 2 is connected to the threaded connector 3 via the second threaded connector 32, the threaded connector 3 is a hollow cylinder, a first cooling channel 33 is provided in the middle of the cylinder, a second cooling channel 21 is provided in the middle of the cutter body 2, the first cooling channel 33 and the second cooling channel 21 are used for receiving and transporting coolant, a coolant chamber 11 is provided in the cutter head 1, the coolant chamber 11 is used for providing a coolant buffer space, liquid outlets 12 are provided on both sides of the outside of the cutter head 1 close to the coolant chamber 11, the liquid outlets 12 are used for outputting coolant, and the first cooling channel 33 is connected to the liquid outlet 12 of the coolant chamber 11 via the second cooling channel 21.

[0030] The first threaded connection portion 31 is a positive thread, and the second threaded connection portion 32 is a negative thread. The different thread directions facilitate installation.

[0031] The diameter of the input end of the first cooling channel 33 is larger than the diameter of the output end of the first cooling channel 33 , so as to facilitate the output of the cooling liquid.

[0032] The end of the cutter body 2 close to the cutter head 1 is an outer concave arc cone surface 13. When the cutter head 1 and the cutter body 2 are pressed together by the processing pressure during rotation processing, vibration is reduced and centering is facilitated.

[0033] The curvature of the outer concave arc cone surface 13 is 138°.

[0034] The cutter body 2 is provided with two guide positioning columns 4 at intervals near the end of the threaded connection 3. The guide positioning columns 4 are truncated cone-shaped, which facilitates the guiding connection between the cutter head 1 and the cutter body 2. The cutter head 1 is provided with two positioning holes 5 at intervals near the end of the threaded connection 3, and each guide positioning column 4 is correspondingly connected to each positioning hole 5.

[0035] The diameter of the guide and positioning column 4 away from the blade body 2 is smaller than the diameter of the guide and positioning column 4 close to the blade body 2.

[0036] The cutter head 1 is provided with two positioning openings 5, each end of which is an inner concave cone surface 6, which is fitted and connected with the outer concave arc cone surface 13, so as to better seal the connection between the first cooling channel 33 and the second cooling channel 21.

[0037] The liquid outlet 12 corresponds to the cutting edge of the cutter head 1 and is located on the same straight line.

[0038] The liquid outlet 12 forms an angle with the cooling liquid chamber 11, and the angle formed by the liquid outlet 12 and the cooling liquid chamber 11 is 15°-45°.

[0039] Beneficial effects of the invention: The invention proposes an internally cooled modular drill bit, wherein the cutter head 1 is fixedly connected to the cutter body 2 by a threaded connector 3, which is convenient for installation. The threaded connector 3 is a hollow cylinder, and a first cooling channel 33 is provided in the middle of the cylinder, and a second cooling channel 21 is provided in the middle of the cutter body 2. The first cooling channel 33 and the second cooling channel 21 are used to receive and transport the coolant. The cutter head 1 is provided with two locating ports 5, and the ends thereof are concave conical surfaces 6, which are fitted and connected with the outer concave arc conical surface 13, so as to better seal the connection between the first cooling channel 33 and the second cooling channel 21. A coolant chamber 11 is provided in the cutter head 1, and the coolant chamber 11 is used to provide a coolant buffer space. The cooling flow rate is large and the flow rate is high through the first cooling channel 33, the second cooling channel 21, and the coolant chamber 11, and the cooling efficiency is high. Liquid outlets 12 are provided on both sides of the outside of the cutter head 1 close to the coolant chamber 11, and the liquid outlets 12 are used to output the coolant. The first cooling channel 33 is connected to the liquid outlet 12 of the coolant chamber 11 through the second cooling channel 21. The liquid outlet 12 corresponds to the cutting edge of the cutter head 1 and is on the same straight line, which further improves the cooling efficiency.

[0040] Although the present application has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art, and several modifications and improvements may be made without departing from the concept of the present application, all of which belong to the protection scope of the present application. The multiple aspects and embodiments disclosed in the present application are only for illustration and are not intended to limit the present application. The actual protection scope of the present application shall be subject to the claims.

Claims

1. An internally cooled modular drill bit, comprising a cutter head (1), a cutter body (2), and a threaded connector (3), characterized in that: The cutter head (1) is fixedly connected to the cutter body (2) via a threaded connection piece (3); one end of the threaded connection piece (3) is a first threaded connection part (31); the other end of the threaded connection piece (3) is a second threaded connection part (32); the cutter head (1) is connected to the threaded connection piece (3) via the first threaded connection part (31); the cutter body (2) is connected to the threaded connection piece (3) via the second threaded connection part (32); the threaded connection piece (3) is a hollow cylinder; a first cooling channel (33) is provided in the middle of the cylinder; and a cooling channel (33) is provided in the middle of the cutter body (2). A second cooling channel (21) is provided, and the first cooling channel (33) and the second cooling channel (21) are used to receive and transport cooling liquid. A cooling liquid chamber (11) is provided in the cutter head (1), and the cooling liquid chamber (11) is used to provide a cooling liquid buffer space. Liquid outlets (12) are provided on both sides of the outside of the cutter head (1) close to the cooling liquid chamber (11), and the liquid outlets (12) are used to output cooling liquid. The first cooling channel (33) is connected to the liquid outlet (12) of the cooling liquid chamber (11) through the second cooling channel (21).

2. The internally cooled modular drill bit according to claim 1, characterized in that: The first threaded connection portion (31) is a positive thread, and the second threaded connection portion (32) is a negative thread; the different thread directions facilitate installation.

3. The internally cooled modular drill bit according to claim 1, characterized in that: The diameter of the input end of the first cooling channel (33) is larger than the diameter of the output end of the first cooling channel (33), so as to facilitate the output of the cooling liquid.

4. The internally cooled modular drill bit according to claim 1, characterized in that: The end of the cutter body (2) close to the cutter head (1) is an outer concave arc cone surface (13); when rotating the cutter head (1) and the cutter body (2) are pressed together by the processing pressure, thus reducing vibration and facilitating centering.

5. The internally cooled modular drill bit according to claim 4, characterized in that: The arc angle of the outer concave arc cone surface (13) is 138°.

6. The internally cooled modular drill bit according to claim 1, characterized in that: The cutter body (2) is provided with two guide positioning columns (4) at intervals near the end of the threaded connection piece (3), the guide positioning columns (4) being truncated cone-shaped, so as to facilitate the guide connection between the cutter head (1) and the cutter body (2), the cutter head (1) is provided with two positioning openings (5) at intervals near the end of the threaded connection piece (3), and each guide positioning column (4) is connected to each positioning block accordingly.

7. The internally cooled modular drill bit according to claim 6, characterized in that: The diameter of the portion of the guide and positioning column (4) away from the blade body (2) is smaller than the diameter of the portion of the guide and positioning column (4) close to the blade body (2).

8. The internally cooled modular drill bit according to claim 6, characterized in that: The cutter head (1) is provided with two positioning openings (5) with concave conical surfaces (6) at the ends thereof. The concave conical surfaces (6) are fitted and connected to the arc conical surface (13), thereby better sealing the connection between the first cooling channel (33) and the second cooling channel (21).

9. The internally cooled modular drill bit according to claim 1, characterized in that: The liquid outlet (12) corresponds to the cutting edge of the cutter head (1) and is located on the same straight line.

10. The internally cooled modular drill bit according to claim 1, characterized in that: The liquid outlet (12) and the cooling liquid chamber (11) form an angle, and the angle formed by the liquid outlet (12) and the cooling liquid chamber (11) is 15°-45°.

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