An adjustable length end mill

Abstract

The utility model belongs to cutting tool technical field especially, it relates to a kind of end mill, to the error problem that the existing end mill rough adjustment is prone to, present and propose the following scheme, including end mill main part, and the length adjusting assembly and extension assembly for adjusting the length of end mill main part;End mill main part includes milling cutter head, and the milling cutter head fixed connection milling cutter stem;Milling cutter stem is externally sheathed with extension rod, and extension rod is externally sheathed with handle;Extension assembly includes: equidistant distribution in the outer wall of extension rod first limit hole, handle outer wall one end is equipped with second limit hole, the utility model can be according to actual processing needs, by adjusting the length of positioning screw in the both sides of inner sliding ring, the extension length of milling cutter head and milling cutter stem can be adjusted, when the lower part distance of positioning screw in inner sliding ring is longer, then the length of milling cutter head and milling cutter stem is extended, otherwise, then the extension length of milling cutter head and milling cutter stem is shortened.

Description

Technical Field

[0001] This utility model relates to an end mill, specifically an adjustable length end mill, and belongs to the field of machining technology. Background Technology

[0002] End mills are the most commonly used milling cutters on CNC machine tools. An end mill has cutting tools on both its cylindrical surface and end face, which can perform cutting simultaneously or individually. They are mainly used for plane milling, groove milling, step milling, and profile milling.

[0003] In the prior art, such as the adjustable-length milling cutter disclosed in CN220921022U, the application includes a milling cutter shank, a milling cutter body at the top of the shank, and an adjustment mechanism at the bottom. This utility model improves the structure of the existing milling cutter by opening a groove at the bottom of the milling cutter and opening several through holes A in the groove. An adjustment mechanism is set at the bottom of the milling cutter shank, and a sleeve of the adjustment mechanism is fitted onto the bottom of the milling cutter shank. A limiting rod and a limiting block are inserted through the through holes A and B, so that the length of the milling cutter can be increased by adjusting the limiting rod and the limiting block according to different needs. A threaded rod is also set at the bottom of the insert assembly, and the threaded rod is threaded to the threaded hole at the top of the milling cutter body. This allows the machining of workpieces of different materials to be achieved by simply changing the insert assembly with the corresponding hardness, avoiding the need for multiple milling cutters of different lengths and materials, which helps to save costs and avoid resource waste.

[0004] However, the following problems were found in the implementation of the relevant technology:

[0005] Most end mills use threaded rods and threaded holes to adjust their length, resulting in relatively large adjustment intervals. This makes it inconvenient to fine-tune the length of the end mill according to actual requirements. Therefore, this paper proposes an adjustable length end mill to overcome the above-mentioned shortcomings. Utility Model Content

[0006] This utility model provides an adjustable length end mill to solve at least one of the above-mentioned technical problems.

[0007] This utility model achieves the above objectives through the following technical solutions:

[0008] An adjustable length end mill includes an end mill body, a length adjustment assembly and an extension assembly for adjusting the length of the end mill body;

[0009] The end mill body includes a milling cutter head and a milling cutter shank fixedly connected to the milling cutter head;

[0010] An extension rod is sleeved on the outside of the milling cutter bar, and a tool holder is sleeved on the outside of the extension rod;

[0011] The extension component includes:

[0012] A number of first limiting holes are evenly distributed on the outer wall of the extension rod, and a second limiting hole is provided at one end of the outer wall of the tool holder. The first limiting holes and the second limiting holes are threadedly connected to a limiting screw. The first limiting holes, the limiting screw and the second limiting holes are used to connect the milling cutter rod and the tool holder.

[0013] As a further improvement of this utility model:

[0014] The length adjustment component includes:

[0015] A first positioning cavity and a second positioning cavity are formed inside the extension rod. The first positioning cavity and the second positioning cavity are connected, and the diameter of the first positioning cavity is larger than the diameter of the second positioning cavity. One end of the milling cutter rod extends into the interior of the first positioning cavity and is sized to fit it.

[0016] As a further improvement of this utility model:

[0017] The milling cutter bar has a first sliding groove on both sides of its outer wall, and a first slider is provided on both sides of the first positioning cavity. The first slider is slidably connected to the first sliding groove and is partially adapted to it. The first slider is fixedly connected to the extension rod.

[0018] As a further improvement of this utility model:

[0019] The second positioning cavity is provided with an inner slip ring, which is fixedly connected to the extension rod.

[0020] As a further improvement of this utility model:

[0021] A positioning screw is inserted inside the inner slip ring. The inner wall of the inner slip ring is smooth. One end of the positioning screw is threaded to the milling cutter rod.

[0022] As a further improvement of this utility model:

[0023] Two positioning nuts are sleeved on the axial direction of the positioning screw and are located on both sides of the inner slip ring. The outer diameter of the positioning nut is the same as the inner diameter of the second positioning cavity.

[0024] As a further improvement of this utility model:

[0025] The inner wall of the handle is provided with a second sliding groove on both sides, and a second slider is slidably connected to the second sliding groove. The two second sliders are respectively fixed on both sides of the outer wall of the extension rod.

[0026] As a further improvement of this utility model:

[0027] The surfaces of the milling cutter bar and the cutter holder are engraved with measuring scales.

[0028] The beneficial effects of this utility model are:

[0029] This invention changes the length of the end mill by moving an extension rod inside the tool holder and altering the distance the extension rod moves. Depending on the machining method, the extension rod is stretched to a suitable position so that the first limiting hole on the extension rod corresponds to the second limiting hole on the tool holder. A limiting screw is then passed through the first and second limiting holes and tightened, connecting the tool holder to the extension rod and maintaining the adjusted length of the end mill.

[0030] This invention allows for adjustment of the extension length of the milling cutter head and the milling cutter shank by adjusting the length of the positioning screw on both sides of the inner slip ring according to actual processing needs. When the lower part of the positioning screw is longer than the inner slip ring, the length of the milling cutter head and the milling cutter shank is extended; conversely, when the lower part is shorter than the inner slip ring, the extension length of the milling cutter head and the milling cutter shank is shortened. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a schematic diagram showing the disassembled structure of the first limiting hole and the limiting screw of this utility model;

[0033] Figure 3 This is a schematic diagram of the extension rod of this utility model;

[0034] Figure 4 This is a schematic diagram of the length adjustment component of this utility model;

[0035] Figure 5 This is a cross-sectional view of the extension rod of this utility model.

[0036] In the picture:

[0037] 1. Milling cutter head; 2. Milling cutter shank; 3. Tool holder;

[0038] 4. Length adjustment assembly; 401. First slide groove; 402. First slider; 403. Positioning screw; 404. Positioning nut; 405. First positioning cavity; 406. Second positioning cavity; 407. Inner slip ring;

[0039] 5. Extension assembly; 501. First limiting hole; 502. Limiting screw; 503. Second slider; 504. Second slide groove; 505. Second limiting hole;

[0040] 6. Extension rod; 7. Measuring scale. Detailed Implementation

[0041] 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. Example 1

[0042] like Figures 1 to 5 As shown, an adjustable length end mill includes an end mill body, a length adjustment assembly 4 and an extension assembly 5 for adjusting the length of the end mill body;

[0043] The end mill body includes a milling cutter head 1 and a milling cutter shank 2 fixedly connected to the milling cutter head 1;

[0044] An extension rod 6 is sleeved on the outside of the milling cutter shank 2, and a tool holder 3 is sleeved on the outside of the extension rod 6;

[0045] Extension component 5 includes:

[0046] A number of first limiting holes 501 are evenly distributed on the outer wall of the extension rod 6. A second limiting hole 505 is provided at one end of the outer wall of the tool holder 3. The first limiting holes 501 and the second limiting holes 505 are threadedly connected to a limiting screw 502. The first limiting holes 501, the limiting screw 502 and the second limiting holes 505 are used to connect the milling cutter rod 2 and the tool holder 3.

[0047] In this embodiment, further:

[0048] By pulling the extension rod 6 inside the tool holder 3, the length of the end mill can be changed by altering the distance the extension rod 6 moves. Depending on the appropriate machining method, the extension rod 6 is stretched to a suitable position so that the first limiting hole 501 on the extension rod 6 corresponds to the second limiting hole 505 on the tool holder 3. Then, the limiting screw 502 is passed through the first limiting hole 501 and the second limiting hole 505 in sequence and tightened with threads. This connects the tool holder 3 and the extension rod 6, maintaining the adjusted length of the end mill. Example 2

[0049] In addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0050] Length adjustment component 4 includes:

[0051] A first positioning cavity 405 and a second positioning cavity 406 are formed inside the extension rod 6. The first positioning cavity 405 and the second positioning cavity 406 are connected, and the diameter of the first positioning cavity 405 is larger than the diameter of the second positioning cavity 406. One end of the milling cutter rod 2 extends into the interior of the first positioning cavity 405 and is sized to fit it.

[0052] The milling cutter bar 2 has a first sliding groove 401 on both sides of its outer wall, and a first slider 402 is provided on both sides of the first positioning cavity 405. The first slider 402 is slidably connected to the first sliding groove 401 and is partially adapted to it. The first slider 402 is fixedly connected to the extension rod 6.

[0053] In this embodiment, further:

[0054] When the milling cutter rod 2 is inserted into the first positioning cavity 405, the first slider 402 can be aligned with the first groove 401 of the first slider 402 to prevent the milling cutter rod 2 from deviating, and the extension rod 6 can be stressed synchronously when the milling cutter rod 2 is stressed. Example 3

[0055] In addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0056] The second positioning cavity 406 is provided with an inner slip ring 407, which is fixedly connected to the extension rod 6.

[0057] A positioning screw 403 is inserted inside the inner slip ring 407. The inner wall of the inner slip ring 407 is smooth. One end of the positioning screw 403 is threaded to the milling cutter rod 2.

[0058] Two positioning nuts 404 are sleeved on the axial direction of the positioning screw 403 and are located on both sides of the inner slip ring 407. The outer diameter of the positioning nut 404 is the same as the inner diameter of the second positioning cavity 406.

[0059] In this embodiment, further:

[0060] First, screw the first positioning nut 404 onto the positioning screw 403. Then, insert the milling cutter shank 2 into the first positioning cavity 405. Insert the positioning screw 403 into the second positioning cavity 406 and pass through the inner slip ring 407. Next, screw the second positioning nut 404 into the second positioning cavity 406 through the end of the positioning screw 403 and press it against the inner slip ring 407. This restricts the position of the positioning screw 403, thereby restricting the milling cutter head 1 and the milling cutter shank 2. According to actual machining needs, the extension length of the milling cutter head 1 and the milling cutter shank 2 can be adjusted by adjusting the length of the positioning screw 403 on both sides of the inner slip ring 407. When the lower part of the positioning screw 403 is longer than the inner slip ring 407, the length of the milling cutter head 1 and the milling cutter shank 2 is extended; conversely, the extension length of the milling cutter head 1 and the milling cutter shank 2 is shortened. Example 4

[0061] In addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0062] The inner wall of the handle 3 is provided with a second sliding groove 504 on both sides. The second sliding groove 504 is slidably connected to a second slider 503. The two second sliders 503 are respectively fixed on both sides of the outer wall of the extension rod 6.

[0063] In this embodiment, further:

[0064] When the milling cutter bar 2 is pulled to move, the second sliders 503 on both sides of the milling cutter bar 2 slide inside the second slide groove 504. The second slide groove 504 can limit the range of movement of the second sliders 503, limit the extension length of the milling cutter head 1, and keep the milling cutter head 1 under force and the tool holder 3 under force synchronously. Example 5

[0065] In addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0066] The surfaces of the milling cutter shank 2 and the tool holder 3 are both engraved with measuring scales 7, which can be used to measure the extension length of the milling cutter shank 2 and the extension rod 6.

[0067] Working principle:

[0068] First, screw the first locating nut 404 onto the locating screw 403. Then, insert the milling cutter shank 2 into the first locating cavity 405. Insert the locating screw 403 into the second locating cavity 406 and pass through the inner slip ring 407. Next, screw the second locating nut 404 into the second locating cavity 406 through the end of the locating screw 403, and press the second locating nut 404 against the inner slip ring 407. This restricts the position of the locating screw 403, thereby restricting the milling cutter head 1 and the milling cutter shank 2. The length of the end mill is finely adjusted. Then, the extension rod 6 is moved inside the tool holder 3 by pulling it. By changing the moving distance of the extension rod 6, the length of the end mill is changed. According to the appropriate machining method, the extension rod 6 is stretched to a suitable position so that the first limiting hole 501 on the extension rod 6 corresponds to the second limiting hole 505 on the tool holder 3. Then, the limiting screw 502 is passed through the first limiting hole 501 and the second limiting hole 505 in sequence and screwed tight. The tool holder 3 and the extension rod 6 can be connected to maintain the adjusted length of the end mill.

[0069] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable-length end mill, comprising an end mill body, and a length adjustment assembly (4) and an extension assembly (5) for adjusting the length of the end mill body, characterized in that: The end mill body includes a milling cutter head (1) and a milling cutter shank (2) fixedly connected to the milling cutter head (1); An extension rod (6) is sleeved on the outside of the milling cutter bar (2), and a tool holder (3) is sleeved on the outside of the extension rod (6). The extension component (5) includes: A plurality of first limiting holes (501) are equidistantly distributed on the outer wall of the extension rod (6). A second limiting hole (505) is provided at one end of the outer wall of the tool holder (3). The first limiting hole (501) and the second limiting hole (505) are threadedly connected to a limiting screw (502). The first limiting hole (501), the limiting screw (502) and the second limiting hole (505) are used to connect the milling cutter rod (2) and the tool holder (3).

2. The adjustable length end mill according to claim 1, characterized in that: The length adjustment component (4) includes: A first positioning cavity (405) and a second positioning cavity (406) are formed inside the extension rod (6). The first positioning cavity (405) and the second positioning cavity (406) are connected, and the diameter of the first positioning cavity (405) is larger than the diameter of the second positioning cavity (406). One end of the milling cutter rod (2) extends into the interior of the first positioning cavity (405) and is sized to fit.

3. An adjustable-length end mill according to claim 2, characterized in that: The milling cutter bar (2) has a first sliding groove (401) on both sides of its outer wall. The first positioning cavity (405) has a first slider (402) on both sides of its interior. The first slider (402) is slidably connected to the first sliding groove (401) and partially adapted. The first slider (402) is fixedly connected to the extension rod (6).

4. An adjustable-length end mill according to claim 2, characterized in that: The second positioning cavity (406) is provided with an inner slip ring (407), which is fixedly connected to the extension rod (6).

5. An adjustable-length end mill according to claim 4, characterized in that: The inner slip ring (407) is provided with a positioning screw (403) inside. The inner wall of the inner slip ring (407) is smooth. One end of the positioning screw (403) is threadedly connected to the milling cutter rod (2).

6. An adjustable-length end mill according to claim 5, characterized in that: The positioning screw (403) is axially fitted with two positioning nuts (404) and located on both sides of the inner slip ring (407). The outer diameter of the positioning nut (404) is the same as the inner diameter of the second positioning cavity (406).

7. An adjustable-length end mill according to claim 1, characterized in that: The inner wall of the handle (3) is provided with a second sliding groove (504) on both sides. The second sliding groove (504) is slidably connected to a second slider (503). The two second sliders (503) are respectively fixed on both sides of the outer wall of the extension rod (6).

8. An adjustable length end mill according to claim 1, characterized in that: The surfaces of the milling cutter bar (2) and the tool holder (3) are both engraved with measuring scales (7).

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